Leica M525 OH4 User Manual

Leica M525 OH4
User manual
10 714 367 – version -
Thank you for purchasing a Leica surgical microscope system.
In developing our systems, we have placed great emphasis on

simple, self-explanatory operation. Nevertheless, we suggest
studying this user manual in detail in order to utilize all the ben-
efits of your new surgical microscope.
For valuable information about Leica Microsystems products

and services, and the address of your nearest Leica represen-
tative, please visit our website,
www.leica-microsystems.com
Thank you for choosing our products. We hope that you will
enjoy the quality and performance of your Leica Microsystems
surgical microscope.
Leica Microsystems (Schweiz) AG

Surgical Microscopy Business Unit
Leica M525 OH4 / Ref. 10 714 367 / Version -

Chapter overview
Introduction 3
Controls 6
Preparation for operation 21
Use 37
Safety notes 58
Care and maintenance 68
What to do if...? 73
Technical data 77
Leica M525 OH4 / Ref. 10 714 367 / Version - 1

Contents
screen screen
Introduction Safety notes

User manual 3 Intended use 58
Product identification 3 Directions for the person responsible for the
Symbols in this user manual 3 instrument 58
Design 4 Directions for the operator of the instrument 59
Controls Dangers of use 60
Leica M525 microscope with swing arm 6 Manufacturer's declaration of electromagnetic
Control unit 7 compatibility (EMC) 62
Terminals 7 Signs and labels 66
Stand 8 Care and maintenance
CAN handles 9 Maintenance instructions 68
Mouth switch 9 Cleaning the touch panel 68
Footswitch 9 Maintenance 68
Beam splitter 17 Changing bulbs 69
Beam splitter with counterweight 17 Checking the timer for the xenon lamp 69
180° assistant’s attachment 17 Changing fuses 70
Ultra Observer Leica ULT500 17 Notes on reprocessing of
Dual Imaging Color Module Leica DI C500 18 resterilizable products 71
Stereoscopic co-observer tube 18 Instructions 71
Tubes 18 What to do if...?
Video and photo accessories for Leica M525 20 General faults 73
Preparation for operation TV, photography 75
Checklist: before the operation 21 Error messages on the control unit 76
Installing optical accessories 22 Technical data
Setting the tube 23 Electrical data 77
Setting the eyepiece 24 Leica M525 77
Installing documentation accessories 24 Accessories 77
Selecting documentation accessories 26 IGS 78
Stand settings 27 Fluorescence 78
Changing the weight disk on the D-axis 33 Floor stand 78
Releasing the brakes 34 Ambient conditions 79
Transport, transporting and rest positions 35 Standards fulfilled 79
Positioning on the operating table 36 Limitations of use 79
Attaching sterile controls 36 List of weights of balanceable configurations 80
Use Dimensional drawings 81
Positioning the microscope 37
Adjusting the microscope 38
Control unit with touch panel 43
Leica DI C500 52
Autofocus settings 54
The Maintenance menu 56
Microscope settings 57
The "How to..." menu 57
The Service menu 57
2 Leica M525 OH4 / Ref. 10 714 367 / Version -

Introduction
User manual Symbols in this user manual

The symbols used in this user manual have the following
In addition to instructions for use, this user meanings:
manual also provides important safety notes (see
the chapter entitled, "Safety notes").
Read the user manual carefully and thoroughly Warning Warning regarding use hazard or
before placing the product in operation. improper use which can cause serious
personal injury or death.
Product identification Caution Warning regarding use hazard or

improper use which can cause minor per-
The model code and serial number of your product are provided sonal injury, but considerable damage to
on the nameplate found on the illumination unit. Write this data property, assets and the environment.
into your user manual and always refer to it when you contact
us or the service workshop regarding any questions you may Useful information that can help the user
have. operate the product correctly and
efficiently.
Model: Serial No.:
➩ Call to action; here you are asked to do -
something.

Introduction
Design
surgical microscope Leica M525 OH4
4
8
5
6
1 Swing arm
2 Tiebar
3 Video monitor (optional)
4 Control unit with touch panel
5 Suspension device for footswitch
6 Illumination unit
7 Base
8 Optical carrier Leica M525

Introduction
1
5
4 2
6
7
1 Vertical arm
2 Terminals
3 Footbrake
4 Handle
5 Articulated arm for monitor
6 Camera control unit (optional)
7 System unit Leica MDRS3 (optional)
The Leica M525 with its open architecture, offers space for accommodating the video control unit and the Leica MDRS3.

Controls
Microscope Leica M525 with swing arm
2
3
15
4
14
16
12 13
17
11
15 CAN socket for accessories (DI C500, FL400)

16 CAN socket (not used)
17 Optical fiber
6
6 10 9 8 7
1 Status LED for fluorescence

- LED lights up white = white light mode
- LED lights up blue = blue light mode
- LED lights up yellow = NIR mode 18
- LED lights up green = Playback mode 19
2 Status LED for recording LED lights up red = recording in 20
progress 24
23 22
3 Push-button for intraoperative AC/BC balancing
4 Switch for manual balancing of the C-carriage 21
5 C-carriage
6 CAN handle
7 Display of set working distance
8 Optical carrier M525
9 Switch for manual balancing of the A-carriage
10 A-carriage
11 CAN handle clamping lever 18 Rotary button for zoom adjustment
12 Switch for manual balancing of the B-carriage 19 Rotary button for illumination field diameter adjustment
13 B-carriage 20 Reset button for zoom dependent illumination field diameter
14 Swing mount adjustment
21 Status of multifocus LED
22 Multifocus key
23 Rotary button for focus adjustment
24 Working distance display

Controls
Control unit
1 11
12
23
2 13
22
3 14
21
15
20
16
19 17
18
1 Touch panel
2 Push-button with illumination LED (on/off)
3 Push-button with LED for Auto Balance
11 Storz light source 18 for Sony NIR camera

Terminals 12 UV camera Hitachi 19 Leica MDRS3
13 BNC IN (2x) 20 SVGA IN 3
4 5 6 7 8 9 10 14 BNC OUT 21 SVGA IN 2
15 S-Video IN (2x) 22 SVGA IN 1
16 S-Video OUT 23 SVGA OUT to Leica DI C500
17 Storz footswitch
4 AD.F. Additional Function 2

5 AD.F. Additional Function 1
6 Footswitch or handswitch 2
7 Footswitch or handswitch 1
8 Internal CAN
24 25 26
9 External CAN
10 External CAN
AD.F. 1 and 2 are digital relay outputs that can switch
24V/2A.
24 S-Video adapter
25 BNC adapter
26 Ethernet adapter
Terminals 24, 25 and 26 are adapters which can be
used to lead out the terminals of the optional
Leica MDRS3 system unit or a camera control.

Controls
Stand
1
2
10
9
7 9 Lamp inserts for main illumination or backup illumination

10 Lever for switching to standby illumination
4
The Leica M525 OH4 surgical microscope has a
primary illumination source and an equivalent standby
illumination source.
5
1 Illumination unit
2 Access door
3 Screw knob
4 Master switch for Leica M525 OH4 surgical microscope
5 Selector switch 100V/120V/220V/240V
6 Power supply
7 Potential equalization socket
8 Fuse box flap

Controls
CAN handles Mouth switch
6
1 3
6 Release preselected brakes
1 Zoom
2 4-function joystick
3 Focus
4 Release All Brakes
5 Release preselected brakes
You can assign switches 1, 2, 3 and 5 of the CAN handles individually for each user in the configuration menu
(see page 50).
Footswitch
Here you will find an overview of the footswitches which you can use to control your Leica M525 surgical microscope.
Footswitches can be assigned individually for each user in the configuration menu (see page 48).
Footswitch Footswitch Footswitch Footswitch

12 functions crosswise 16 functions crosswise 12 functions lengthwise 16 functions lengthwise

Controls
Presets "Cranial"/"Spine"/"ENT"
Here you will find an overview of the assignments of the CAN
handles and an optionally connected footswitch for the preset
user "Cranial"/"Spine"/"ENT".
You can assign CAN handles and footswitches
individually for each user in the configuration menu
(see pages 48 and 50).
Y+ Y+
X- X+ X- X+
Y- Y- Zoom +
Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
All Brakes All Brakes
Selected brakes Selected brakes
Y+
X- X+
Focus + Focus -
No function No function
Zoom + Zoom -
Y-

Controls
Preset "Image Injection IGS DI C500"

user "Image Injection IGS DI C500".
IGS 3 Y+
IGS 4 IGS 2 X- X+
IGS 1 Y-
Zoom + Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
Y+
X- X+
Focus + Focus -
IGS 3 IGS 2
IGS 4 IGS 1
Zoom + Zoom -
Y-

Controls
Preset "Image Injection ENDO DI C500"

user "Image Injection ENDO DI C500".
No function Y+
DI C500: Display on/off DI C500:Shutter control X- X+

No function Y-
Zoom + Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
Y+
X- X+
Focus + Focus -
DI C500: DI C500:
Display on/off Shutter control
Zoom + Zoom -
Y-

Controls
Preset "Fluorescence Vascular FL800"

user "Fluorescence Vascular FL800".
FL800 NIR Zoom Reset Y+
FL800 Mode on/off MDRS3 FL: Playback&Enter X- X+

MDRS3 FL:Menu&Down Y-
Zoom + Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
Y+
X- X+
Focus + Focus -
FL800 Mode on/off FL800 NIR

Zoom Reset
MDRS3 FL:Menu&Down MDRS3 FL:

Playback&Enter
Zoom + Zoom -
Y-

Controls
Preset "Fluorescence Oncology FL400"

user "Fluorescence Oncology FL400".
No function Y+
FL400 Mode on/off No function X- X+

Zoom + No function Y-
Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
Y+
X- X+
Focus + Focus -
FL400 Mode on/off No function
Zoom + Zoom -
Y-

Controls
Preset "Fluorescence Oncology FL400 & IGS DI C500"

user "Fluorescence Oncology FL400 & IGS DI C500".
IGS 3 Y+
IGS 4 IGS 2 X- X+
Zoom + IGS 1 Y-
Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
FL400 Mode on/off Selected brakes
IGS 3
IGS 4 IGS 2
Focus + Focus -
Zoom + Zoom -
IGS 1

Controls
Preset "Fluorescence Oncology FL400 & Vascular FL800"

user "Fluorescence Oncology FL400 & Vascular FL800".
FL800 NIR Zoom Reset Y+
FL800 Mode on/off MDRS3 FL: Playback&Enter X- X+

MDRS3 FL: Menu&Down Y-
Zoom + Zoom +
Focus + Focus +
Zoom - Zoom -
Focus - Focus -
FL400 Mode on/off Selected brakes
FL800 NIR Zoom Reset

FL400 Mode on/off MDRS3 FL: Playback&Enter
Focus + Focus -
Zoom + Zoom -
MDRS3 FL: Menu&Down

Controls
A comprehensive range of accessories enables the 180° second observer attachment

Leica M525 OH4 surgical microscope to be matched to the
requirements of the task in hand. Your Leica representative will
be pleased to help you select the appropriate accessories.
Beam splitter
• Allows a second observer to view the procedure
Ultra Observer Leica ULT500
• Can be used for co-observation or documentation

Light distribution: 50% on each side (mono) or 30% / 70%
Beam splitter with counterweight T5

00
UL
ICA
LE
VIDEO
• Beam splitter with eight optical ports

• Light distribution:
Surgeon (front) 40% (stereo)
Assistant (rear) 40% (stereo) or
Assistant (side) 40% (mono)
Documentation (side) 20%
• Can be used for co-observation or documentation

Light distribution: 50% on each side (mono)

Controls
Dual Imaging Color Module Leica DI C500 Stereo attachment for second observer
VIDEO
• Is attached to the side outputs of a beam splitter.
• Beam splitter with eight optical ports

• Integrated color display shows data or video images.
• Light distribution:
Surgeon (front) 40% (stereo)
Assistant (rear) 40% (stereo) or
Assistant (side) 40% (mono)
Documentation (side) 20%

Controls
Inclined binocular tube

Tubes
Binocular tube variable from 30°–150°
Straight binocular tube
• Variable viewing angles from 30° to 150°

• Adjustable viewing height
• Adjustable interpupillary distance
Binocular tube variable from 0°–180°
Inclined binocular tube 45°
• Variable viewing angles from 0° to 180°

Controls
Video and photo accessories for Leica M525
8 8
7
3
1 2 3 4 5 6
1 Leica 2D Pick up 5 Zoom Video Adapter

2 Photo/TV dual attachment 6 Phototube
3 Photo camera 7 Video camera (such as the Leica D2D V3)
4 TV attachment 8 Leica 2D C-Mount
Leica 2D pick-up TV attachment

• Video system for recording 2D video sequences. • For commercially-available video cameras with C-mount,
complete with adapter.
Leica 2D C-Mount • The TV attachment (4) is installed at the documentation port
• Video system for recording 2D video sequences. of the 0° assistant’s attachment.
• The camera (8) is mounted on the TV attachment or Zoom • Position of video camera engageable in 90° increments.
Video Adapter.
Zoom Video Adapter
Photo/TV dual attachment • For commercially-available video cameras with C-mount,
• For using a video camera with C-mount at the same time as complete with adapter.
an SLR camera. • The Zoom Video Adapter (5) is installed at the documentation
Complete with adapters. port of the 0° assistant’s attachment.
• Position of video camera engageable in 45° increments. • Zoom and fine focus function for Leica Zoom Video Adapter
• Video port with incorporated brightness adjustment
(3 positions). Phototube
• Complete with adapter, for SLR cameras.
• Adapter f = 250mm: for large fields of view and short expo-
sure times.
• Adapter f = 350mm: for high magnifications.
• The phototube (6) is mounted on the documentation port of
the 0° assistant’s attachment.

Preparation for operation
Positioning at the OP table

Checklist: Before the operation ➩Position the surgical microscope on the OP table as required,
and lock the footbrake (see page 35).
Cleaning the optical accessories
➩Check the tubes, eyepieces and the documentation
accessories (if used) for cleanliness. Sterility
➩Remove dust and dirt (see page 68). ➩Fit sterile components and sterile drape if used (see page 36).
Installing accessories
➩Lock the Leica M525 OH4 in place and install all accessories Warning 2
on the microscope so it is ready for use (see page 22). Danger of fatal electric shock
➩Position the CAN handles as required. ➩Operate the system only with all equipment in its
➩Connect a mouth switch and/or footswitch (if used). proper position (all covers fitted, doors closed).
➩Check the camera image on the monitor and realign if
necessary.
Checking tube settings

➩Check the tube and eyepiece setting for the selected user
(see page 24).
➩Treat the eyepieces with an antifogging compound if
necessary.
Balancing
➩Balancing the Leica M525 OH4 (see page 27).
➩Press the "All Brakes" button on the CAN handle and check
the balancing.
Function check
Warning 1
Danger of fatal electrical shock.
➩The Leica M525 OH4 surgical microscope may be
connected to a grounded socket only.
➩Connect the power cable.

➩Switch on the microscope.
➩Switch on the illumination at the control unit.
Leave the illumination on for at least 5 minutes, as
otherwise luminosity will decrease rapidly.
➩Replace defective bulbs before the operation begins.
➩Test all functions on the CAN handles and on the footswitch.
➩Check the user settings on the control unit for the selected
user (see page 45).

Installing optical accessories Installing the 90° stereo attachment, binocular tube and beam
splitter
Warning 3
Risk of injury through surgical microscope moving
down!
➩Complete all preparations and adjustments to the
stand before the operation.
➩Never balance or re-equip the instrument over the
field of operation.
➩Always lock the Leica M525 OH4 in position before re-
equipping it.
➩Balance the Leica M525 OH4 after re-equipping it.
➩Do not release the brakes when the instrument is in an
unbalanced state.
Locking the Leica M525 OH4 in position

3
The D-axis of the Leica M525 OH4 is locked in position with the
locking device.
The locking device is principally for installation and ➩Release the clamping screw (3).
re-equipping the Leica M525 OH4. ➩Insert the accessories into the dovetail ring from above.
➩Tighten the clamping screw (3).
➩Pull out the locking buttons (1 and 2) and turn them until the
two points (arrows) are aligned above each another. Installing the stereo attachment for second observer
➩Insert the stereo attachment and check whether the

connection has engaged.
➩Tighten the locknut (4) by hand.
➩Align the attachment for second observer as required.
➩Move the swing arm up and down until locking device (1)
engages.
➩Move the swing arm back and forth until locking device (2)
engages.

Setting the tube

Set the interpupillary distance
Adjust the interpupillary distance to a value between 55mm and

75mm.
2 1
➩Using the adjusting wheel (1), set the interpupillary distance

such that a circular image field can be seen.
This procedure has to be performed only once for each user.

The acquired value (2) can be stored for each user on the "User
Settings" menu screen under "Tube Settings" (see page 51).
Adjusting the tilt
➩Hold the tube with both hands.

➩Tilt the tube up or down.

Checking parfocality
Setting the eyepiece
➩Place a flat test object with sharp contours under the lens at
Determine/set the diopters for the user working distance.
➩Zoom through the whole range, observing the test object.
The individual diopters can be adjusted continuously for each The image sharpness must remain constant at all
eyepiece from +5 to -5. Only this method will ensure that the magnifications. If this is not the case, check diopter settings
image will stay in focus within the entire zoom range = parfocal. of the eyepieces.
The treatment microscope ensures a high degree of fatigue
resistance when the diopter setting is correct for both eyes.
A parfocal adjusted microscope ensures that the assis- Installing documentation accessories
tant´s view and monitor image will always remain
Fitting the Leica 2D
sharp.
➩Set to the minimum magnification. See user manual Leica 2D (10708979).
➩Place a flat test object with sharp contours under the lens at
working distance. Fitting the photo/TV dual attachment
➩Focus the microscope.
➩Set to the maximum magnification. ➩Install the dual attachment on the beam splitter.
➩Focus the microscope. ➩Equip the video camera (1) with the TV objective (2) and insert
➩Set to the minimum magnification into the dual attachment.
➩Tighten the clamping screw.
➩Loosen the clamping screw and engage the video camera
until it engages in one of the 45° increments depending on
Rotary ring for adjusting the available space.
the diopters ➩Tighten the clamping screw.
➩Equip the photo camera (5) with camera adapter (4).

➩Screw the photo lens onto the camera adapter (4).
➩Fit the camera to the dual attachment.
➩Without looking into the eyepieces, turn both eye lenses to

+5 diopters.
➩Slowly turn the eyepieces towards -5 individually for each 1
eye until the test object appears sharp.
➩Select the highest magnification and check the sharpness.
This procedure has to be performed only once for each 2
user. The acquired values can be stored for each user
on the "User Settings" menu screen under "Tube
Settings" (see page 51).
Adjusting the pupillary distance 5 4 3
Eyecup
1 Video camera
2 TV lens
3 Adapter M600 to M500 interface
4 Camera adapter
5 Photo camera and photo lens
The object image at the camera output is laterally
reversed!
➩Rotate the eyecups up or down until the desired distance is
set.

Using the dial, the brightness of the video can be Fitting the phototube
adjusted to 30%, 50% or 100%. One of these filters can
be switched with the 8% filter provided. To do so, ➩Mount the phototube on the beam splitter.
remove the camera and change the filter in the TV ➩Secure the camera adapter to the SLR camera.
output. ➩Connect the f = 250mm or f = 350mm adapter to the camera
adapter.
➩Secure the camera, complete with adapter, in the phototube.
TV attachment / zoom video adapter
➩Mount the TV attachment on the documentation port of the
beam splitter.
➩Screw the adapter to the camera using the C-mount.
Camera
➩Insert the camera with the adapter into the TV attachment
and tighten the clamping screw.
Camera adapter
Video camera
Adapter
C-mount adapter
Clamping screw
Clamping screw
Phototube
TV attachment
90° click-stop (TV attachment only):

➩Loosen the clamping screw.
➩Engage the camera at one of the 90° increments in
accordance with the space available and tighten the
clamping screw.
Setting the Zoom Video Adapter parfocal:

➩Set to the maximum magnification.
➩Place a flat test object with sharp contours under the
objective.
➩Look through the eyepieces and focus the microscope.
➩Set to the minimum magnification.
➩Set the maximum magnification (f=100) on the Zoom Video
Adapter.
➩Focus the monitor image on the Zoom Video Adapter.
Adjusting the magnification
Focusing knob
➩Set the desired magnification on the Zoom Video Adapter.

Selecting documentation accessories

Zoom video adapter TV PhotoTV dual TV PhotoTV dual Zoom video TV
attachment attachment attachment attachment Adapter attachment
35mm 55mm 60mm 70mm 85mm 100mm 107mm
1/4 “
1/3 “
1/2 “
2/3 “
1“
Photo/TV dual attachment
250 mm 350 mm
35 mm
Digital
Photo Field of view
Camera
Monitor/image

Stand settings ➩Press the autobalancing push-button (3) on the control unit.
During the balancing procedure, the push-button (2) flashes
Automatic balancing of the Leica M525 OH4 green and an acoustic signal sounds (can be deactivated in the
service menu).
Warning 5
Danger of injury due to movement of the microscope
during the balancing process.
➩Do not stand next to the microscope during the
balancing process.
Warning 6
Danger of injury due to the Leica M525 OH4 surgical 2
microscope moving down.
field of operation.
➩Balance the Leica M525 OH4 surgical microscope
after re-equipping it.
unbalanced state.
➩Never perform intraoperative AC / BC balancing over
the patient.
The following dialog window opens on the touch panel monitor:
➩Switch on the Leica M525 OH4.
➩Install the accessories in the permitted weight range
(see Technical data, screen 80).
➩Align the accessories in the working position.
➩Press the "All Brakes" button on the CAN handle and move
the optical carrier into the A-position.
The mark (1) musty be pointing to A.
The balancing procedure can be canceled at any time

using "Interrupt Balancing".

The first balancing step is complete when the acoustic signal ➩Press the "All Brakes" button on the CAN handle, tilt the
no longer sounds and the push-button (2) is no longer flashing. optical carrier forwards 90° and move it into the B-position.
The mark (1) must be pointing towards B.
If automatic balancing cannot be successfully completed, the

following dialog window opens:
If the mounted accessories (e. g. the assistant's tube)

do not allow a 90° tilt movement, turn the tube
upwards, tilt the optical carrier forwards and move the
tube back into its working position.
➩Press the autobalancing push-button (2) on the control unit
again.
During the balancing procedure, the push-button (2) flashes
yellow and an acoustic signal sounds (can be deactivated in
the service menu).
➩Acknowledge with the "Close" button.

➩Correct the alignment of the optical carrier (A-position).
➩Press push-button (2).
Autobalancing re-starts.
2

➩The following dialog window opens on the touch panel: If automatic balancing cannot be successfully completed, the
following dialog window opens:
The balancing procedure can be canceled at any time

➩Acknowledge with the "Close" button.
using "Interrupt Balancing".
➩Correct the alignment of the optical carrier (B-position).
➩Press the push-button (2).
➩Balancing is complete when the acoustic signal no longer Autobalancing re-starts.
sounds and the push-button (2) is no longer flashing.
A dialog window indicates that balancing has been completed.
➩Press the "Close" button or wait until the dialog window is

closed automatically after 5 seconds.
➩Check the balancing.
➩Press the "All Brakes" button on the CAN handle and position
the microscope.
The microscope must remain fixed in any position.

Intraoperative balancing ➩Press the start button for automatic AC/BC balancing on the
swing arm.
During the balancing procedure, the push-button (2) on the con-
Warning 4
trol unit flashes green and an acoustic signal sounds.
Danger of injury due to movement of the microscope
during the balancing process.
➩Do not stand next to the microscope during the
balancing process.
Warning 5
Danger of injury due to swinging down of the
Leica M525 OH4 surgical microscope.
2
field of operation.
➩Balance the Leica M525 OH4 surgical microscope
after re-equipping it.
unbalanced state.
Intraoperative AC/BC balancing allows re-balancing during the

operation. Re-balancing may be necessary if, for instance, an
assistant's tube is adjusted. The A-axis is balanced first, followed by the C-axis.
Either axes A and C or B and C can be balanced.
B/C balancing
For best results, it is recommended to balance axes A
and C before balancing axes B and C.
If work is performed only in the upright microscope position, re-
A/C balancing balancing of the B/C axes may be sufficient.
If work is performed only in the horizontal microscope position, the optical carrier into the B-position.
re-balancing of the A/C axes may be sufficient. The mark (3) must be pointing towards B.
the optical carrier into the A-position.
The mark (2) must be pointing towards A.
1
3

➩Press the start button (1) for automatic AC/BC balancing on Correcting the balancing manually
the swing arm.
For manual balancing, the axes can be moved manually using
switches (3), (4) and (5).
1
During the balancing procedure, the push-button (2) on the con-

trol unit flashes yellow and an acoustic signal sounds. 4
Make sure that no accessories collide with the

microscope during manual balancing.
The B-axis is balanced first, followed by the C-axis.

➩Check the balancing.
➩Press the "All Brakes" button on the CAN handle and position
the microscope.
The microscope must remain fixed in any position.
➩Correct the balancing, if necessary.

➩Check the balancing. The optical carrier tilts forwards:

➩Press the "All Brakes" button on the CAN handle. ➩Move the A-axis back with switch (2) until the optical carrier
is balanced.
.
1
The optical carrier tilts to the right:

➩Move the C-axis to the left with switch (1) until the optical
carrier is balanced.
The optical carrier (in the B-position, e.g. for posterior fossa
The optical carrier tilts to the left: operations) tilts back:
➩Move the C-axis to the right with switch (1) until the optical ➩Move the B-axis forwards with switch (x) until the optical
carrier is balanced. carrier is balanced.
The optical carrier tilts forwards:
➩Move the B-axis back with switch (x) until the optical carrier
is balanced.
If the microscope cannot be balanced manually, the
weight of the accessories is probably outside the
balanceable weight range. This can only be done for A,
B and C axes by reducing or increasing the accessory
weight to within the permitted range (see page 80).
The optical carrier (in the A-position) tilts back:

➩Move the A-axis forwards with switch (2) until the optical
carrier is balanced.

Correcting the D-balancing manually The D-balancing of the stand can be corrected with the "+" and
"-" keys on the "Main" screen of the control unit.
The internal weight (3) in the stand balances the weight of the
surgical microscope and the installed accessories.
It may be necessary to correct the D-balancing after
fitting a sterile drape on the microscope.
"+" key: correction for higher load on the optical carrier

"-" key: correction for reduced load on the optical carrier
1
To balance the D-axis when using accessories with dif-

D ferent weights, the number of D-axis weight disks can
be adapted accordingly (see below).

➩Unscrew the hexagon nut (3).
Changing the weight disk on the D-axis

If the Leica M525 OH4 cannot balance the accessories in use,
a weight disk must be added to or removed from the D-axis.
Caution 1
Danger of injury due to falling weight disk or cover!
➩When changing the weight disk, make sure that your
feet are not beneath the weight disk or the cover.
2
➩Locking the Leica M525 OH4 in position (see page 22).
➩Detach the cover (1) from the axis.
3
1
➩Add or remove the disk (2).

➩Screw on the hexagon nut (3).
➩Re-attach the cover (1).
No. of Load
weight disks D-axis
Heavy Light Min. Max.
2 1 6.65 10.22
2* 2 7.4 10.88
2 3 7.9 11.54
*Standard configuration

Releasing the brakes The following movements can be performed with the surgical
microscope when the brake combination "XYZ Free" is
The Leica M525 OH4 surgical microscope has six activated:
electromagnetic brakes which stop the movements of the stand
and surgical microscope:
• Up/down and forward/back in parallelogram (0 and 1)

• Base (2)
• In swing arm (3)
• On the A and B carriages of surgical microscope (4)
• In the rotary joint (5)
1
4
0
The following movements can be performed with the surgical
microscope when the brake combination "Focus Lock" is
2
activated:
The CAN handle key with the "Selected Brakes" function (see
also Assigning CAN handles, page 50) can release two different
brake combinations: "Focus Lock" or "XYZ Free".
The brake combination "Focus Lock" is set as the
default.
➩Activate the desired brake combination "Focus Lock" or
"XYZ Free" on the touch panel in the "Speed" menu by clicking
the relevant button.
The button for the selected brake combination lights up green.
You can save the desired brake combination
individually for each user in the user settings in the
"Start Values Speed" menu.

Make sure that the video monitor does not collide with
Transport, transporting and rest the horizontal arm and the vertical arm of the stand.
positions ➩Unplug and secure the power cable.
➩Release the footbrake.
Warning 6 ➩Depress the footbrake at the front end (FREE).
Danger of injury due to: The footbrake disengages and is released.
• Uncontrolled lateral movement of the swing arm!
• Tilting of the stand!
• Feet in lightweight shoes could become trapped
beneath the casing of the base.
➩For transportation, always move the Leica M525 OH4
surgical microscope into the transport position.
➩Never move the stand in the extended condition.
➩Never roll over cables lying on the floor.
➩Always push the Leica M525 OH4 surgical microscope
- never pull it.
Caution 2
Surgical microscope can move without warning!
➩Always lock the footbrake when you are not moving
the system.
➩Move the Leica M525 OH4 using the handle.
Transport position
Always move your Leica M525 OH4 into the transport position Rest position
before transporting it.
Bring the microscope into rest position after use.
Caution 3 ➩Push the microscope in the transport position to its storage
Damage to the Leica M525 OH4 surgical microscope location.
due to uncontrolled tilting! ➩Depress the footbrake at the rear end (LOCK) until it engages.
➩Hold the CAN handle when releasing the brake.
Caution 4
Damage to the Leica M525 surgical microscope during
transportation!
➩Press the "All Brakes" button and move the Leica M525 OH4
into the transport position (see illustration below).
➩Pull the protective cover over the Leica M525 OH4.

Preparation for operation/Use
Positioning on the operating table Attaching sterile controls

Sterilizable covers can be fitted on the rotary buttons on the
Warning 3 Leica M525 OH4 surgical microscope.
Risk of injury through surgical microscope moving down!
➩Never balance or re-equip the instrument over the Covers for rotary buttons
field of operation.
➩Always lock the Leica M525 OH4 in position before re- Use the covers also when you use sterile disposable
equipping it. drapes.
➩Balance the Leica M525 OH4 after re-equipping it. The controls will be more grippy.
➩Do not release the brakes when the instrument is in an ➩Fit steam-sterilizable covers on the light field diameter adjust-
unbalanced state. ment knob and the working distance adjustment knob.
The Leica M525 OH4 can be positioned easily on the operating

table and offers a variety of possibilities for operations on the
head or spinal column.
The M525 OH4 achieves this large range of positions through its
very long and high swing arm.
➩Release the footbrakes (see page 35).
➩Move the Leica M525 OH4 surgical microscope carefully over
to the operating table by the handle and into the required
position for the operation.
Positioning options:
➩Use steam-sterilizable covers also when using accessories.
Drape for footswitch

Packaging the footswitch in a plastic bag protects it
against dirt.
➩Set footbrake.
➩Plug the footswitch into the stand and position it.
➩Plug the power cable into the stand.
➩Connect the equipotential bonding to the stand.

Use
Sterile drape for stand

You can also use an optional sterile disposable drape.
Positioning the microscope
Coarse positioning
Caution 5
Risk of infection!
➩Hold the microscope by both CAN handles.
➩Leave sufficient space around the stand to ensure that
➩Press the button for releasing the brakes and position the
the sterile drape does not come into contact with non-
microscope.
sterile components.
➩Release the brakes button.
➩Activate the "All Brakes" function on the CAN handle and Also refer to the "Release brakes" chapter on page 34.
extend the swing arm.
➩Wear sterile gloves.
➩Attach all sterile controls. Caution 3
➩Unpack the sterile drape carefully and drape it over the Damage to the Leica M525 OH4 surgical microscope
Leica M525 surgical microscope as far as the swing arm. due to uncontrolled tilting!
➩Clamp the protective glass (optional) onto the objective. ➩Hold the CAN handle when releasing the brake.
➩Do not attach the sterile drape too tightly with the provided
ribbons. It must still be easy to move the instrument. Fine positioning
Check the ease of movement of the instrument.
➩Position the microscope with the XY drive using the joystick
on the CAN handle or the joystick on the footswitch.
Follow the instructions provided by the manufacturer of
the sterile drape.
Attaching the protective glass to the objective
➩Place the gas-sterilizable protective glass on the objective so

that the marks on the optical carrier (1) and protective
glass (2) are aligned one above the other.
2 b
In the "Speed" menu you can adjust the speed at which
a the XY motors are operated.
This value can be saved individually for each user

➩Insert the protective glass upwards into the bayonet mount in
(see page 46).
direction (a).
➩Turn the protective glass in direction (b) until it engages.

Use
On the handswitch/footswitch /CAN handle:

Adjusting the microscope Depending on assignment (see page 48), the brightness of the
main illumination can also be increased or decreased using two
Switching on the illumination correspondingly assigned keys on the handswitch/footswitch/
CAN handle.
➩Press push-button (1) for illumination.
The illumination comes on and the push-button is lit green. BrightCare™
BrightCare™ is a safety function which automatically limits the

maximum brightness depending on the working distance.
Excessively bright light can, in combination with a short
working distance, cause burns in patients.
1 Explanation of luminous energy:
The optics of the Leica M525 OH4 surgical microscope have a
variable working distance of between 207 and 470mm. The sys-
tem is designed in such a way that it delivers sufficient light to
produce a bright image even at a long working distance of
470mm.
According to the formula Ev=Iv/d2, luminous energy increases
constantly to 510% as a function of a reduction in working
distance from 470 to 207mm. (Ev = light intensity, Iv= brightness,
d= distance from light source).
This means that less light is required to work with the
Leave the main and backup illumination on for at least microscope at a shorter distance than at a greater distance.
5 minutes, as otherwise luminosity will decrease It is advisable to begin with a low light output and increase the
rapidly. light intensity until an optimum level of illumination is achieved.
With "BrightCare™" the safety function is activated for
Adjusting the brightness all users in the factory default configuration.
Explanation of heat release:
Brightness can be increased or decreased using the touch Heat from non-visible light (over 700nm) is filtered out of the
panel monitor or a handswitch/footswitch or CAN handle. light from the used xenon light source. Nevertheless, white light
always releases heat. An excessive amount of white light can
On the touch panel monitor: cause overheating of tissue and metallic objects.
➩Press the "+"- or "-" key on the brightness adjustment bar for Therefore, it is advisable to begin with a low light intensity and
illumination. increase this until an optimum level of illumination is achieved.
or
➩Adjust the brightness directly in the bar.
The brightness of the active main illumination changes.
Clicking the "+" or "-" key changes the brightness value
in increments of one. Holding down the mouse button
with your finger changes the value in increments of
five.
The start setting can be saved individually for each

user.
The main illumination can only be switched on and off

using the illumination push-button (on/off) (1).
The brightness setting is also visible when the illumina-

tion is off. However, the display bar will appear darker.

Use
When the "Brightcare™" safety function is deactivated, the

color of the "Brightcare™" button changes from green to yellow.
Warning 7
At a short focal distance, the light source of the
illumination unit may possibly be too bright for the
operating physician and the patient.
➩Start with a low light level and gradually increase the
light intensity until the operating physician has an opti-
mally illuminated image.
The status of the "BrightCare™" safety function can
only be changed permanently in the "User settings"
menu. A change in status during operational
procedures will not be stored when the user settings
are saved with "Save" or "Save as"!
Reactivating the "Brightcare™" safety function:
➩Click the yellow "BrightCare™" button again.
The red line on the brightness adjustment bar shows the
"BrightCare™" is now activated and the button is again lit green.
maximum adjustable brightness for the current working
distance.
The brightness cannot be set to a level beyond the red line
When the working distance is reduced by too little at a set
brightness, the brightness is reduced automatically.
This safety function can be deactivated by clicking the
"Brightcare™" button. A dialog window opens in which
you have to confirm that you want to deactivate the
safety function.

Use
Changing lamps
1
In case of failure of the xenon main illumination, your
Leica M525 OH4 automatically uses the second xenon lamp as
backup illumination.
You can also switch manually to the backup

illumination with the "Change Lamp" button on the
"Main" screen.
Replace the defective lamp at the next opportunity. Caution 6

Hot lamp insert can cause burns!
Never begin an operation with only one functioning ➩Do not touch the hot lamp insert.
xenon lamp.
➩Push down the lamp quick changer (4).
A dialog window informs you when the xenon lamp is
losing luminosity. We recommend that you keep a
replacement lamp handy.
Changing over to backup illumination
➩Undo screw knob (3) and open the access door (2) for lamp
inserts on the illumination unit.
The push-button (1) flashes orange.
4

Use
Setting the illumination field diameter Adjusting the magnification (zoom)

Caution 7
You can set the magnification with a footswitch/handswitch or
Heating of tissue!
with the "Magnification" adjustment bar in the "Main" menu of
If the illumination field diameter is larger than the
the control unit.
visual field and the light intensity is set too high, uncon-
trolled heating of tissue can occur outside the visible Clicking the "+" or "-" key changes the magnification
range of the microscope. value in increments of one. Holding down the mouse
➩Do not set the light intensity too high. button with your finger changes the value in
increments of five.
The light field diameter is automatically adapted to the size of
the visual field at the Leica M525 optical carrier. The You can adjust the zoom motor speed in the "Speed"
illumination field diameter can also be adjusted manually with menu.
rotary button (2). Automatic adjustment can be deactivated with
the rotary button and reactivated with the Reset button (1). These values can be saved individually for each user
(see page 46).
Warning 8
Danger to the patient due to failure of the zoom motor!
➩In case of failure of the zoom motor, the zoom can be
adjusted manually.
Manually adjusting the magnification (zoom)

2
1 Caution 8
Destruction of the zoom motor!
➩Use the manual adjustment of the zoom motor only if
the zoom motor is defective.
In case of failure of the zoom motor, the zoom can be adjusted

manually using rotary button (3).
If the illumination field diameter is blocked at a high

light intensity in a high zoom setting, and cannot be 3
adjusted automatically or manually, then the light
intensity must be reduced in order to protect the tissue.
If the illumination field diameter remains blocked in a

low zoom setting, and cannot be adjusted
automatically or manually, then an OP lamp can be
used for better illumination of a large visual field (low
zoom setting).
➩Hold down rotary button (3).

➩Set the desired magnification by turning the knob.

Use
Setting the working distance (focus) Setting the focus manually

Warning 9 Warning 11
Danger of serious damage to tissue due to incorrect Danger of serious damage to tissue due to incorrect
working distance! manual adjustment of the working distance!
➩When using lasers, always set the working distance of ➩Do not adjust the rotary button for manual setting of
the microscope to laser distance and lock the the working distance while using the laser.
microscope in position.
In case of failure of the focus motor, the focus can be adjusted
You can set the working distance with the footswitch/hand- manually using rotary button (2).
switch or with the "WD" adjustment bar in the "Main" menu of
the control unit.
Clicking the "+" or "-" key changes the working distance
in increments of one. Holding down the mouse button
five.
You can adjust the focus motor speed in the "Speed"

menu.
2
Using the Reset WD button, the focus motor can be set
to the working distance which has been saved for the
current user (see page 46). 3 4
You can save the currently set working distance on the

"Main" screen of the control unit or read it off the
display (1) on the M525 optical carrier.
➩Turn rotary button (2) and set the focus as required.
Locking/releasing the focus

It is necessary to lock the focus when working at a
fixed distance or when using the laser.
➩Press key (3).

The yellow LED (4) comes on and the focus is locked.
➩Press key (3) again.

1 The yellow LED (4) goes out and the focus is released.
Warning 10
Danger to patient due to failure of the zoom motor!
➩In case of failure of the zoom motor, the zoom can be
adjusted manually.

Use
Switching the microscope on

Control unit with touch panel
➩Switch on the microscope at the power switch (2) on the
Menu structure stand.
After the surgical microscope is switched on, the settings of the
1 5 last active user are loaded.
➩Switch on the illumination with the key (1) on the control unit.
2
1
1 Quick access to the screens "Main", "Speed", "Menu",

"DI C500" and "Help"
2 Warning messages
3 Status line
4 Display range
5 Dynamic button bar
In operational mode, the status bar displays the current

user and specifies the current location in the menu at
all times.

Use
Selecting users
In the "Main" and "Speed" menus, three buttons are always dis-
played in the dynamic button line: "Presets", "User List" and
"Show Settings".
Click the "1-15" or "16-30" button to switch between screens.

You can find a list of default users preset by Leica for the most
common types of operation under "Presets". ➩Select user and click "Select".
The user settings are loaded.
When the user list is open, it can be edited at any time
(see page 45).
Before every operation, make sure the required user is

selected and familiarize yourself with the assignments
of the CAN handle and, if used, the optional footswitch.
➩Click “Show Settings” button to see an overview of the user
settings of the curent user.
➩Select one of the preset default users and click "Load".

The Leica M525 OH4 surgical microscope is ready to operate
straight away.
You can adapt and save the settings of these default
users as required (see page 44).
You can click the "Show Settings" button at any time to

see an overview of the user settings of the current
user.
Clicking the "User List" button opens a two-screen list of users
from which you can select one of up to 30 configurable users.

Use
Editing the user list Configuring users (User Settings menu)
Various functions are available in the user list depending on the

situation.
➩Select user.
The available functions are displayed in the dynamic button
line:
• "Move"
Moves the selected user to another available location of your You can configure user settings in this menu.
choosing.
• "Delete"
Deletes the selected user.
Finally, you must confirm this action with "Acknowledge".
• "Rename"
Renames an existing user. The user's settings are not
changed.
In the "User Settings" menu, click the "Edit User List"
button to access the dynamic button line in user list
edit mode.
• "Load"
Loads the settings of an existing user from the user list for
modifying.
• "New User"
Opens a new user with "blank" settings.
• "New (Preset)"
Opens the "Preset" screen for selecting a default user in order
to create a new user with the settings of the desired preset
and to load or modify the user's settings.
You can also add a user from the operational menu. If
We recommend that you do not change the configura- you want to keep the current settings, you can save
tion of the user settings or edit the user list during an them by clicking the "Save" button (which appears as
operation. soon as the basic settings of the current users have
been changed), either for the current user ("Save") or
under a new username ("Save as").

Use
Saving user settings Setting the "Main" start values
➩Click the "Save" button. On this screen, you can set the start values for illumination,
➩In the user list select an available location where the user working distance and magnification.
can be saved.
If you like, you can edit the user list first.
Clicking the "+" or "-" key changes the values in

increments of one. Holding down the mouse button
five.
➩Enter the desired username using the keyboard.
You can also set the desired value by directly clicking
the bars.
On the "Main" user settings screen you can set the sta-
tus of the BrightCare™ safety function for the selected
user.
On the "Main" user settings screen you can

permanently save the default settings for WD-Reset. If
"WD Reset" is activated, the focus motor automatically
moves to the working distance saved for each user in
the user settings when "All Brakes" are released. This
function is deactivated in the factory default configura-
tion.
➩Click the "WD-Reset" button.
The "WD-Reset" function is activated, the "WD-Reset" button
changes color form gray to green.
➩Click the "Save" button to save the user at the desired
location under the name you have entered.

Use
Setting the drive start values Footswitch/handswitch assignment
You can set the start values for the travel speed of the zoom, Here, you can configure individual settings for each user for the
focus and XY motors on this screen. footswitch/handswitch you are optionally using.
➩Select the footswitch/handswitch you are using in the right

options menu.
You can scroll forwards or backwards in the list by
clicking the arrowheads.
You can also connect the 6-function footswitch to the

Leica M525 OH4 as an option. The existing 6 switches
have the same functions as the currently selected 12 or
16-function footswitch.
➩Click the "Default" button.
The default settings are assigned to the selected
footswitch/handswitch.
You can then modify these settings as you like.
Clicking the "Clear All" button clears the assignments

Clicking the "+" or "-" key changes the values in for all keys.
five.
You can also set the desired value by directly clicking

the bars.
On the "Speed" menu screen you can also select the

desired brake combination "Focus Lock" or "XYZ Free"
for the CAN handle function "Selected Brakes".
➩Activate the desired brake combination "Focus Lock" or
"XYZ Free" on the touch panel in the "Speed" menu by clicking
the relevant button.
The button for the preselected brake combination lights up
green.

Use
Configuring individual keys Fluorescence: FL400 Mode On/Off

FL800 Mode On/Off
➩Select the footswitch/handswitch you are using in the right FL800 NIR Zoom Reset
options menu. MDRS3 FL:Record Start/Stop
MDRS3 FL:Playback&Enter
MDRS3 FL:Menu&Down
No function
➩Select the function group with the desired functions in the left
options menu. DI C500 / IGS: DI C500: Image Injection On/Off
DI C500: Shutter Control
DI C500: Brightness+
DI C500: Brightness-
➩Select the desired function. IGS 1
➩Click the caption of the desired key to assign the selected IGS 2
function to it. IGS 3
or IGS 4
➩Press the corresponding key on the connected footswitch. No function
Overview of function groups

To delete an assignment which you do not want, select
the "No function" element - which can be found in all
Drive: Magnification +
function groups - and assign it to the key in question.
Magnification -
Focus +
If you are creating only one footswitch/handswitch
Focus -
configuration for one user, we recommend duplicating
No function
it to the second footswitch/handswitch input by press-
ing the "Duplicate" button.
Extra: AD.F.1 Toggle
This ensures that your footswitch/handswitch
AD.F.1 Pulse
functions the way you want it to, regardless of which
AD.F.2 Toggle
input it is plugged into.
AD.F.2 Pulse
MDRS 3 Record Start/Stop
XGA Out toggle 1/2
XGA Out toggle 1/2/3
Video toggle source
AF500 Start
No function
You can change the status of a function with the
"Toggle" function (e.g. on/off). The "Pulse" function con-
tinuously changes a status (such as increasing the
brightness).
Light: Illumination +
Illumination -
No function
XY: X+
X-
Y+
Y-
XY Complete
No function
With the "XY Complete" function, you can assign all four
functions of the joystick simultaneously.

Use
CAN handle assignments
On the two CAN handle assignment screens, you can assign up

to nine functions of your choice to the left and right CAN
handles.
The "All Brakes" function is always assigned to the rear
switch (1) for both CAN handles, and can neither be
overwritten nor deleted.
1
2
➩Select the function group with the desired functions in the left
options menu.
➩Select the desired function.
➩Click an available caption of the desired key to assign the
selected function to it.
The inner switch (2) to which "Selected Brakes" is pre-
assigned can be freely assigned, as required.
You can also assign one of the four defaults "DI C500",
"X/Y", "FL400", "FL800" completely to each CAN handle.

Use
Tube Settings
On this screen, you can store the diopter values and interpupil-
lary distance for each user.
You can set the user-specific values by clicking the

arrowheads. These values are shown for the current
user in the status line.

Use
Leica DI C500 Controls on the CAN handle/footswitch
Operating the control unit You can assign the following functions to your CAN handle/
footswitch for controlling your Leica DI C500 (see page 12):
If you are using a DI C500, a Quick Access Button "DI C500" is
added to the static menu line.
"DI C500: Image Injection on/off"

Switches the data display on/off manually. The shutters are
Changing the current brightness of the image data: switched as pre-configured in the user settings.
➩Press the "+" or "-" key on the "DI C500" screen. You require this function for example when you want to
or display endoscope data on your Leica DI C500.
➩Adjust directly by clicking the brightness adjustment bar.
"DI C500: Shutter Control"
Clicking the "+" or "-" key changes the brightness value Opens or closes the shutter manually as pre-configured in the
in increments of one. Holding down the mouse button user settings.
five. "DI C500: Brightness+"
Increases the brightness of the image data.
Press button “Image off” to switch of the DI C500
display (brightness = 0 %). "DI C500: Brightness-"
Reduces the brightness of the image data.
You can also adjust the brightness of the image data
using the CAN handle/footswitch. User settings
You can configure the following settings for the user in the user
settings:
• Default brightness for the injection of overlay data and non
overlay data
• Shutter settings for manual operation
• Shutter settings
• Surgeon's shutter settings
Setting the default brightness for the injection of overlay data

and non overlay data:
➩To adjust the brightness, press the "+" or "-" key or click
directly in the bar.

Use
Clicking the "+" or "-" key changes the brightness value A connected IGS navigation system automatically con-
in increments of one. Holding down the mouse button trols the shutter independent of this setting.
Surgeon's shutter settings
five.
➩In the options menu "Surgeon Shutter Settings (Non Overlay
Shutter settings for manual operation: Data)" specify whether you want with or without object view
in the non reflected beam path on the surgeon's side.
You can adapt these settings intraoperatively using the
CAN handle or on the "DI C500" screen on the control
Surgeon's shutter closed
unit (see page 48).
The second beam path is dimmed. In the other beam path, the
Shutter settings: data is displayed on a dark background.
➩Specify how data are to be displayed on your Leica DI C500 in
This setting does not affect the assistant's view.
the options menu "Manual Shutter Settings (Main Shutter)".
Overlay Data (open)

Displayed data are overlaid on the object.
All shutters are opened.
Surgeon's shutter open

You have a view of the object in the second beam path. In the
other beam path, the data is displayed on a dark background.
Non-Overlay (closed)
Displayed data are displayed on a black background. The shut-
ter on the display side is closed.
In the preview window you can view the shutter

settings you have selected, depending on the display
side that is currently set on your Leica DI C500.

Use
Resize autofocus window

Leica AF500 The preview shows actual size of the autofocus window. Auto-
focus window displays the area of the object that is to be
The autofocus Leica AF500 works with the cameras focussed on.
Leica2, Sony DXC 33P and Leica UV-camera Hitachi. You can proportionately increase or decrease the size
Contact your Leica representative if you want to adapt of the autofocus window for your needs. The default
another camera. setting is 25%.
Clicking the "+" or "-" key changes the value in

We recommend to use the Leica AF500 only in
combination with a video adapter having a fix focal
five.
length.
Because autofocus needs a flat image plane to be set
in focus you should reduce the size of the autofocus
window. The default Setting is 25%.
Operating
Adjusting the position of autofocus window
➩To switch on the autofocus press on/off button on the front
side of the housing.
The preview shows actual position of the autofocus window.
➩Start autofocus function by pressing the corresponding
Autofocus window displays the area of the object that is to be
button on the CAN handle.
focussed on.
(see ”Footswitch/handswitch assignment “on page 48)
If you activate the „Brake starts Autofocus“ function in
You can move the position of the autofocus window.
the user settings menu the autofocus is automatically
Adjust value for X- and Y-position.
focussing when releasing „All brakes“ or „Selected
Brakes“ . Clicking the "+" or "-" key changes the value in
If you activate the parfocality function in the user
settings menu the autofocus is always driving in maxi-
five.
mum position first, then in minimum position and back
to current set working distance when focussing. The default setting is 50 % along each axis. This places
the autofocus window exactly in the centre.
User settings in the control unit

The autofocus can be individually assigned for each
user in the "User Settings" menu.

Use
Check switches
The Maintenance menu On this screen, you can test the footswitches/handswitches
and CAN handles you are using.
Hour meter for the bulbs (Lamp History)

On this screen, you can view the operating hours of xenon
lamp 1 and xenon lamp 2.
➩Select the connection you are using in the right upper options
menu.
➩You can scroll forwards or backwards in the list by clicking
the arrowheads.
➩Select the footswitch/handswitch or CAN handle to be tested
in the right lower options menu.
the arrowheads.
➩Press all of the keys, one after the other, of the
footswitch/handswitch or CAN handle you want to test.
If the key you have pressed is functioning properly, a green dot
Whenever you replace a bulb, reset the bulb's hour appears on it on the display. The comment "Tested" appears in
meter to 0 by double-clicking the "Reset" button. the caption field of the key.

Use
Microscope settings
The "How to..." menu
On this screen you can configure the accessories you are
using. This screen displays, in short form, user instructions for operat-
This ensures that the correct magnification is displayed on the ing your surgical microscope.
"Main" menu screen.
➩In the top options field, enter the tube currently being used by
the surgeon.
the arrowheads.
➩In the middle options field, select the magnification of the
eyepieces being used by the surgeon.
The "Help" button in the static menu bar provides
the arrowheads.
access to the "How To..." screens at all times.
If you do not make a selection, the magnification is cal-
culated for the standard equipment - binocular tube
30°-150° and eyepiece with 10x magnification. The Service menu
This area is password-protected.

Use
The Leica M525 OH4 surgical microscope is state-of-the-art ➩If you use accessories made by third-party manufacturers
technology. Nevertheless, hazards can arise during operation. with the Leica M525 OH4 surgical microscope, be sure that
➩Always follow the instructions in this user manual, and in par- each such manufacturer confirms the safety-engineering,
ticular the safety guidelines. harmless usability of the product and observe the product's
user manual.
➩Modifications to or service on the Leica M525 OH4 surgical
microscope may be carried out only by technicians who are
Intended use explicitly authorized by Leica to do so.
➩Only original Leica replacement parts may be used in servic-
• The Leica M525 OH4 surgical microscope is an optical instru- ing the product.
ment for improving the visibility of objects through magnifica- ➩After servicing or making technical modifications, the instru-
tion and illumination. It can be applied for observation and ment must be re-set in accordance with our technical specifi-
documentation and for human and veterinary medical cations.
treatment. ➩Leica accepts no liability if the instrument is modified or
• The Leica M525 OH4 surgical microscope may be used only in serviced by unauthorized persons, not maintained as
closed rooms and must be placed on a solid floor. specified (unless maintenance is performed by us) or not
• The Leica M525 OH4 surgical microscope is subject to used/handled properly.
special precautionary measures for electromagnetic compat- ➩Interaction of other devices through the Leica surgical micro-
ibility. They must be installed and put into operation in accor- scope was proven in accordance with EN 60 601-1-2. The
dance with the guidelines, manufacturer's declarations and system passed the emission and immunity test. The standard
recommended safety distances (Tables 201, 202, 204, and 206 safety precautions and safety requirements relating to
according to EN 60601-1-2:2001). electromagnetic and other radiation must be observed.
• Portable and mobile as well as stationary RF communications ➩Domestic electrical installation must be conducted in
equipment can have a negative effect on the reliability of the accordance with the national standard, e.g. use of a residual
Leica M525 OH4 surgical microscope. current protective device (FI protection) is recommended.
➩As with every other instrument used in operative
Warning 12 applications, this system is subject to failure. Leica
Not suitable for use in ophthalmology! Microsystem (Schweiz) AG therefore recommends that a
backup system be kept available during the operation.
Directions for the person responsible for

the instrument
➩Ensure that the Leica M525 OH4 surgical microscope is used
only by persons qualified to do so.
➩Ensure that this user manual is always available at the place
where the Leica M525 OH4 surgical microscope is in use.
➩Carry out regular inspections to make certain that the
authorized users are adhering to safety requirements.
➩When instructing new users, do so thoroughly and explain
the meanings of the warning signs and messages.
➩Assign individual responsibilities for starting, operating and
servicing the Leica surgical microscope and monitor the
observance of these responsibilities.
➩Only use the Leica M525 OH4 surgical microscope if it is free
of defects.
➩Inform your Leica representative or Leica Microsystems
(Schweiz) AG, BU SOM, 9435 Heerbrugg, Switzerland,
immediately if you detect a product defect that could
potentially cause injury or harm.

Safety notes
Directions for the operator of the

instrument
➩Follow the instructions described here.
➩Follow the directions provided by your employer regarding
work organization and safety.
Stability
When moved in the OP, the swing arm must be folded up and
locked and the brakes must be applied, otherwise the swing
arm may drift out of control and the stand could topple.
Hazards due to moveable parts

This section describes uses that, inadvertently, could lead to
hazardous situations.
• Add accessories and balance the stand before the operation,
and never over the field of operation.
• Do not put your fingers between the microscope and the
focusing drive; they could get crushed.
Floor stand:
• When displacing the stand, push it. Do not pull it. Feet in light-
weight shoes could become trapped beneath the casing of
the base.
• The footbrakes must remain engaged throughout the
operation.
Electrical terminals
The control unit may be opened only by a Leica-approved
service technician.
Accessories
Only the following accessories may be used on the
Leica M525 OH4 surgical microscope:
• The Leica accessories described in this user manual.
• Other accessories, provided that these have been expressly
approved by Leica as being technically safe in this context.

Safety notes
Warning 6
Dangers of use Danger of injury due to:
• Uncontrolled lateral movement of the swing arm!
Warning 1 • Tilting of the stand!
Danger of fatal electrical shock! • Feet in lightweight shoes could become trapped
➩The Leica M525 OH4 surgical microscope may be con- beneath the casing of the base.
nected to a grounded safety socket only. ➩For transportation, always move the Leica M525 OH4
surgical microscope into the transport position.
Warning 2 ➩Never move the stand in the extended condition.
Danger of fatal electric shock. ➩Never roll over cables lying on the floor.
➩Operate the system only with all equipment in its ➩Always push the Leica M525 OH4 surgical microscope
proper position (all covers fitted, doors closed). - never pull it.
Warning 3 Warning 7
Risk of injury through surgical microscope moving At a short focal distance, the light source of the
down! illumination unit may possibly be too bright for the
➩Complete all preparations and adjustments to the operating physician and the patient.
stand before the operation. ➩Start with a low light level and gradually increase the
➩Never balance or re-equip the instrument over the light intensity until the operating physician has an opti-
field of operation. mally illuminated image.
➩Always lock the Leica M525 OH4 in position before re-
equipping it. Warning 8
➩Balance the Leica M525 OH4 after re-equipping it. Danger to the patient due to failure of the focus motor!
➩Do not release the brakes when the instrument is in an ➩In case of failure of the focus motor, the focus can be
unbalanced state. adjusted manually.
➩Before re-equipping during the operation, first swing
the microscope away from the operating field. Warning 9
Danger of serious damage to tissue due to incorrect
Warning 4 working distance!
Danger of injury due to movement of the microscope ➩When using lasers, always set the working distance of
during the balancing process. the microscope to laser distance and lock the
➩Do not stand next to the microscope during the microscope in position.
balancing process.
Warning 10
Warning 5 Danger to patient due to failure of the zoom motor!
Danger of injury due to swinging down of the ➩In case of failure of the zoom motor, the zoom can be
Leica M525 OH4 surgical microscope. adjusted manually.
➩Never balance or re-equip the instrument over
the field of operation. Warning 11
➩Balance the Leica M525 OH4 surgical microscope Danger of serious damage to tissue due to incorrect
after re-equipping it. manual adjustment of the working distance!
➩Do not release the brakes when the instrument is ➩Do not adjust the rotary button for manual setting of
in an unbalanced state. the working distance while using the laser.
➩Never perform intraoperative AC / BC balancing
over the patient. Warning 12
Not suitable for use in ophthalmology!

Safety notes
Caution 1 Caution 11
Danger of injury due to falling weight disk or cover! Danger of skin burns!
➩When changing the weight disk, make sure that your The lamp insert is very hot.
feet are not beneath the weight disk or the cover. ➩Before changing the lamp, make sure that the lamp
insert has cooled down.
Caution 2
Surgical microscope can move without warning!
➩Always lock the footbrake when you are not moving
the system.
Caution 3
Damage to the Leica M525 OH4 surgical microscope
due to uncontrolled tilting!
➩ Hold the CAN handles securely before you press the
"All Brakes" button.
Caution 4
Damage to the Leica M525 surgical microscope during
transportation!
Caution 5
Risk of infection!
➩Leave sufficient space around the stand to ensure that
the sterile drape does not come into contact with non-
sterile components.
Caution 6
Hot lamp insert can cause burns!
➩Do not touch the hot lamp insert.
Caution 7
Heating of tissue
If the illumination field diameter is larger than the
visual field and the light intensity is set too high, uncon-
trolled heating of tissue can occur outside the visible
range of the microscope.
➩Do not set the light intensity too high.
Caution 8
Destruction of the zoom motor!
➩Use the manual adjustment of the zoom motor only if
the zoom motor is defective.
Caution 9
Damage of the touch panel
➩Operate the touch panel using your fingers only.
Never use hard, sharp or pointed objects made out of
wood, metal or plastic.
Caution 10
Damage of the touch panel
➩Never clean the touch panel using cleaners that
contain abrasive substances. These substances can
scratch the surface and cause it to be become dull.

Safety notes
Manufacturer's declaration of electromagnetic compatibility (EMC)

This "Guidance and manufacturer's declaration" document is based on EN 60601-1-2:2001.
Table 201 from EN 60601-1-2:2001
Guidance and manufacturer's declaration – electromagnetic emissions
The Leica M525 OH4 surgical microscope is intended for operation in an environment as specified below.
The customer or the user of the Leica M525 OH4 surgical microscope should make sure that it is used in such an environment..
Emissions test Compliance Electromagnetic environment – guidance
RF emissions Group 1 The Leica M525 OH4 surgical microscope uses RF energy only for its
according to CISPR 11 internal function. Therefore, its RF emissions are very low and are not
likely to cause any interference in nearby electronic equipment.
RF emissions Class A The Leica Leica M525 OH4 is suitable for use in establishments
according to CISPR 11 other than domestic and those directly connected to the public low-
voltage power supply network that supplies buildings used for residential
purposes.
Harmonic emissions Class A

according to
IEC 61000-3-2
Emissions of voltage compliant

fluctuations/flicker
according to IEC 61000-3-3

Safety notes Safety notes
Table 202 from EN 60601-1-2:2001
Guidance and manufacturer's declaration – electromagnetic immunity
The customer or the user of the Leica M525 OH4 surgical microscope should make sure that it is used in
such an environment.
Immunity test IEC 60601 test level Compliance level Electromagnetic environment – guidance
Discharge of static ± 6KV ± 6KV Floors should be of wood, concrete or

electricity (ESD) according to contact discharge contact discharge ceramic tile. If the floor is of synthetic mate-
IEC 61000-4-2 rial, the relative humidity must be at least
± 8KV air ± 8KV air 30%.
High-freq. transient ± 2KV for ± 2KV for Mains power quality should be that of a
electrical interference / power lines power lines typical commercial or hospital environment.
Burst
according to IEC 61000-4-4 ± 1KV for input and ± 1KV for input and
output lines output lines
Surges ± 1KV ± 1KV Mains power quality should be that of a

according to normal mode normal mode typical commercial or hospital environment.
IEC 61000-4-5
± 2KV ± 2KV
common mode common mode
Voltage drops <5% UT (>95% <5% UT (>95% Mains power quality should be that of a
short interruptions dip in UT) dip in UT) typical commercial or hospital environment.
and voltage variations for 1/2 cycle for 1/2 cycle If the user of the Leica M525 OH4 surgical
IEC 61000-4-11 microscope requires that the instrument
40% UT (60% 40% UT (60% remain functional even after mains power
dip in UT) dip in UT) interruptions, it is recommended that the
for 5 cycles for 5 cycles Leica M525 OH4 surgical microscope be
provided with an auxiliary power source
70% UT (30% 70% UT (30% such as an uninterruptible power supply
dip in UT) dip in UT) (UPS) or battery back-up.
for 25 cycles for 25 cycles
<5% UT (>95% <5% UT (>95%

dip in UT) dip in UT)
for 5 sec. for 5 sec.
Magnetic fields at 3 A/m not applicable

mains frequency
(50/60Hz) according to
IEC 61000-4-8
Note: UT is the a.c. mains voltage prior to application of the test level.

Table 204 from EN 60601-1-2:2001
Guidance and manufacturer's declaration – electromagnetic immunity
The customer or the user of the Leica M525 OH4 surgical microscope should make sure that it is used in
such an environment.
Immunity test IEC 60601 test level Compliance level Electromagnetic environment – guidance
Portable and mobile RF communications

should be used no closer to any part of the
Leica M525 OH4, including its cables, than
the recommended separation distance
calculated from the equation applicable to
the frequency of the transmitter.
Recommended separation distance:
Conducted RF – 3Veff 3Veff d = 2.4 P

Interference 150kHz to 80MHz for 150kHz to 80MHz
Radiated RF – 3V/m 3V/m d= 2.4 P

Interference 80MHz to 2.5GHz for 80MHz to 2.5GHz
where P is the maximum output power rating
of the transmitter in watts (W) according to
the transmitter manufacturer and d is the rec-
ommended separation distance in meters (m).
Field strengths from fixed RF transmitters, as
determined by an electromagnetic site
survey, should be less than the compliance
level in each frequency range. Interference
may occur in the vicinity of equipment
marked with the following symbol:
Note 1: At 80MHz, the higher frequency range applies.
Note 2: These guidelines may not apply in all situations. Electromagnetic propagation
is affected by absorption and reflection from structures, objects and people.
a Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios,
amateur radio, AM and FM broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the
electromagnetic environment due to fixed RF transmitters, an electromagnetic site survey should be considered. If the
measured field strength in the location in which the Leica M525 OH4 surgical microscope is used exceeds the applicable RF
compliance level above, the Leica M525 OH4 surgical microscope should be observed to verify normal operation. If abnormal
performance is observed, additional measures may be necessary, such as reorienting or relocating the Leica M525 OH4
surgical microscope.
b Over the frequency range 150kHz to 80MHz, field strengths should be less than 3V/m.

Safety notes
Table 206 from EN 60601-1-2:2001
Recommend separation distances between portable and mobile RF telecommunications equipment and
the Leica M525 OH4 surgical microscope
The Leica M525 OH4 surgical microscope is intended for operation in an electromagnetic environment in which RF interference is
controlled. The customer or the user of the Leica M525 OH4 surgical microscope can help prevent electromagnetic interference
by maintaining a minimum distance between portable and mobile RF communications equipment (transmitters) and the Leica
M525 OH4 surgical microscope as recommended below, according to the maximum output power of the communications
equipment.
Separation distance according to frequency of transmitter in m
Rated maximum output 150kHz to 2.5GHz

power of transmitter W
d = 2.4 P in m
0.01 0.24
0.1 0.8
1 2.4
10 8.0
100 24.0
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (m)
can be estimated using the equation applicable to the frequency of the transmitter, where P is the maximum output power
rating of the transmitter in watts (W) according to the transmitter manufacturer.
Note 1: These guidelines may not apply in all situations. Electromagnetic propagation is affected by
absorption and reflection from structures, objects and people.
Warning message:
If use is made of accessories or cables other than those specified in this user manual or approved by the manufacturer of the
Leica M525 OH4 surgical microscope, this can lead to an increase in electromagnetic radiation or a reduction in EMC.
Warning message:
The Leica M525 OH4 surgical microscope must not be used directly adjacent other instruments.
If it is necessary to operate them in the vicinity of other instruments, the microscopes should be monitored to ensure that they func-
tion properly in this arrangement.

Safety notes
Signs and labels
7
2
6
3
Grounding reliability La fiabilité de la mise à

can only be achieved la terre n’est assurée
when EQUIPMENT is que si l’équipement est
DO NOT USE connected to connecté à une prise
IN OPHTALMO- equivalent receptacle marked “Hospi- équivalente, marquée «Hôpital seule-
LOGY tal only” or “Hospital Grade”. ment» ou «Qualité hôpital».
1 2 3
Leica Microsystems (Schweiz) AG

CH-9435 Heerbrugg
MODEL LEICA M525 OH4
1600 VA 50/60 Hz
100/120/220/240 V ~
MITAKA KOHKI CO. LTD PRIM 100/120 V PRIM 2xT10A
No. 220/240 V PRIM 2xT8A PAT No. 5.528.417
Made in Japan PAT No. 6.050.530
4 5 6
7 8

Safety notes
Only to be operated
by trained personnel
1 2
3 4

Safety notes
Caution 23
Maintenance instructions Damage to the touch panel
➩Operate the touch panel using your fingers only.
• Put a dust cover over the instrument during breaks in work. Never use hard, sharp or pointed objects made out of
• Keep accessories in a dust-free place when not in use. wood, metal or plastic.
• Remove dust with a pneumatic rubber pump and a soft brush.
• Clean the objectives and eyepieces with special optics Caution 24
cleaning cloths and pure alcohol. Damage to the touch panel
• Protect the surgical microscope from damp, vapors, acids, ➩ Never clean the touch panel using cleaners that
alkalis, and corrosive substances. contain abrasive substances. These substances can
Do not keep chemicals near the instrument. scratch the surface and cause it to be become dull.
• Protect the surgical microscope from improper handling.
Install other device sockets or unscrew optical systems and
mechanical parts only when explicitly instructed to do so in
Maintenance
this user manual.
The Leica M525 OH4 surgical microscope generally requires no
• Protect the surgical microscope from oil and grease.
maintenance. To ensure that it always operates safely and reli-
Never oil or grease the guide surfaces or mechanical parts.
ably, we recommend that you take the precaution of contacting
• Remove coarse debris with a moistened disposable cloth.
the responsible service organization.
• For disinfecting the surgical microscope, use compounds
Here you can arrange for periodic inspections and, if
from the surface disinfecting group based on the following
necessary, conclude a maintenance contract.
active ingredients:
aldehydes,
alcohols, It is recommended to conclude a service contract with
quaternary ammonia compounds. Leica Service.
Due to potential damage to the materials, never use
Use only original spare parts for servicing.
substances based on
halogen splitting compounds,
strong organic acids, After 18 months you will be reminded that the
oxygen splitting compounds. inspection is due when you switch on the microscope.
Follow the disinfectant manufacturer’s instructions.
It is recommended to conclude a service contract with

Leica Service.
Cleaning the touch panel

➩Before cleaning the touch panel, switch off your
Leica M525 OH4 and disconnect it from the power supply.
➩Use a soft, lint-free cloth to clean the touch panel.
➩Do not apply cleaning agent directly to the touch panel;
rather, apply it to the cleaning cloth.
➩Use a commercially available glass/eyeglass cleaner or plas-
tic cleaner to clean the touch panel.
➩Do not apply pressure to the touch panel while cleaning it.
The touch panel is resistant to most disinfectants used
in the medical field. ➩Press Exit.
The dialog window is closed.

Care and maintenance
A dialog window opens when the lamp power drops

Changing bulbs below the recommend minimum level.
➩Open the access door (2) for lamp inserts.
The illumination push-button (item 2, page 7) flashes orange.
1 2
➩Press the "Close" button.

The dialog window is closed.
3 ➩Replace defective lamps.
Checking the timer for the xenon lamp

A timer window (5) for the xenon lamp is located on the main
Caution 25 illumination fitting. It displays the operating hours of the xenon
Danger of skin burns! lamp.
The lamp insert is very hot.
➩Before changing the lamp, make sure that the lamp We recommend that a xenon lamp with a remaining
insert has cooled down. useful life of 10% be replaced before commencing an
operation.
➩Remove the defective lamp insert (1 or 3) and install a new
lamp insert (spare part no. 10 448 022).
When installing the lamp insert, make sure that the
arrow (4) is pointing to the left.
➩Close the access door.
The illumination push-button (item 2, page 7) lights up green.

Changing fuses
Range 220V–240V: two 8A fuses, slow blow
Range 100V–120V: two 10A fuses, slow blow
➩Remove the cover (1) with a screwdriver.
➩Remove the fuses (2) from their receptacles and replace

them.

Cleaning: automatic
Notes on reprocessing of resterilizable Equipment: Cleaning/disinfecting device
products It is not recommended to clean products with optical
components in a cleaning/disinfecting device. In addition,
Products optical components must not be cleaned in ultrasonic baths in
Reusable products supplied by Leica Microsystems (Schweiz) order to prevent damage.
AG such as rotary knobs, objective protective glasses and
capping pieces. Disinfection
The alcohol disinfection solution "Mikrozid, Liquid" may be used
Limitation of reprocessing: in accordance with the instructions on the label.
For the medical devices used on patients suffering from Please note that optical surfaces must be rinsed thoroughly
Creutzfeldt Jacob Disease (CJD) or suspected of having CJD or with fresh drinking water, followed by fresh demineralized
variant CJD, the local statutory requirements have to be met. water, after disinfection. The products must be dried thoroughly
Normally resterilizable products used on this group of patients before the subsequent sterilization.
are to be eliminated without risk by incineration.
Maintenance
Occupational safety and health protection No special requirements.
Particular attention must be paid to the occupational safety and
health protection of the persons responsible for preparing cont- Control and functional test
aminated products. Current regulations of hospital hygiene and Check the snap-on behavior of rotary knobs and CAN handles.
prevention of infection must be observed in the preparation,
cleaning and disinfection of the products. Packaging
Separate: A standard PE bag may be used. The bag must be
Limitation of reprocessing large enough for the product so that the closure is not under
Frequent reprocessing has little effects on these products. tension.
The end of the product life cycle is usually determined by wear
and year and damage through use. Sterilization
See Table 1
Instructions Storage
No special requirements.
Workplace
Remove surface contamination with a disposable cloth / paper
Additional information
cloth.
None
Storage and transport
Contact information of manufacturer
No special requirements.
Address of local agent
It is recommended to perform the reprocessing of a product
immediately following its use.
Leica Microsystems (Schweiz) AG verified that the
aforementioned instructions for the preparation of a product
Preparation for cleaning
are suitable for its reuse. The processing person is responsible
Remove the product from the Leica M525 OH4 surgical
for reprocessing with the equipment, materials and personnel
microscope.
and for achieving the desired results in the reprocessing instal-
lation. In general, this requires validations and routine monitor-
Cleaning: manual
ing of the process. Every deviation from the supplied
Equipment: running water, rinsing agent, spirit, micro-fiber cloth
instructions should also be examined carefully by the
Procedure:
processing person to determine effectiveness and possible
1. Rinse surface contamination off of the product (temp. <40°C).
detrimental consequences.
Use some rinsing agent depending upon degree of
contamination.
2. If the optics is heavily contaminated, e.g. finger marks, fat
streaks etc., use spirit for cleaning.
3. Dry off products, except for optical components, with a
disposable cloth/paper cloth. Dry off optical surfaces with a
micro-fiber cloth.

Table 1: Sterilization
Permissible sterilization methods

Steam (autoclave) Ethylene oxide
Item no. Designation 134°C, t > 10min. max. 60°C
10180591 Clip-on handle X
10428328 Rotary knob, binoc. tube T X
10384656 Rotary knob, transparent X
10443792 Lever extension X
10429792 Capping piece, slit lamp X
10445368 Cover, binoc. tube 0–180° X
10445289 Handswitch holder X
10446058 Protective glass, multifoc. obj. X 1)

10446469 Objective protective glass Leica M680 X 1)
10446467 Objective protective glass Leica M840/M841 X 1)
10443714 Rotary ring, objective 0° X

10445341 Handle for Leica M655. sterilizable X
10445549 Handle for Leica M695 X
10445340 Cap for Leica M655/M695. sterilizable X
1)
Products with optical components can be steam-autoclaved using the conditions listed above. However, this may lead to the
formation of a layer of dots and streaks on the glass surface, which may reduce the optical performance.

General faults
If the equipment is no longer operating properly,
please consult your Leica representative.
Fault Cause Remedy

The microscope tilts when you press The swing arm is not correctly ➩Balancing the swing arm
the "All Brakes" button. balanced. (see page 27).
The microscope cannot be moved or A cable is sticking. ➩Re-lay the affected cable.
moved only with a great deal of effort.
Leica M525 OH4 locked. ➩Release the lock (see page 22).
Functions cannot be operated with the A cable connection has come loose. ➩Check the power cable.
footswitch or the control on the CAN ➩Check the footswitch connection.
handles.
Incorrect assignment entered at control ➩Change the assignments on the control
unit. unit.
No light in the microscope. The fiber optic cable has come loose. ➩Check the optical fiber connection.
Main illumination and/or backup ➩Switch to different light source

illumination defective. (see page 40).
The image remains unfocussed. Eyepiece are not mounted correctly. ➩Screw in the eyepiece completely.
Diopters not set correctly. ➩Perform diopter correction exactly

as instructed (see page 24).
The microscope or the swing arm moves Swing arm is not correctly balanced. ➩Balance the Leica M525 OH4
up/down or rotates by itself. (see page 27).
Cables are not correctly laid or have ➩Lay the cable in accordance with the
slipped out of position and exert force on installation instructions and provide a
the system (poss. additional video cable). strain relief.
Leica M525 OH4 was balanced in ➩Release the lock (see page 22) and
a locked state. balance the Leica M525 OH4
(see page 27).
Microscope and swing arm are difficult Automatic balancing was not completed. ➩Make sure that the microscope is in
to move or cannot be moved at all. position B (see page 30).
➩Press the push-button for Auto
Balance again.

What to do if...?
What to do if...?
Fault Cause Remedy
Automatic balancing cannot Microscope is tilted at too great an ➩Align A/B axes on microscope
be performed. angle. in parallel (see page 30).
➩Repeat automatic balancing
procedure.
Zoom cannot be adjusted electrically. Failure of the zoom motor. ➩Press the Zoom rotary button.
➩Set the zoom by turning the button
(see page 41).
No XY movements are possible at one of No XY movements have been set in ➩Set the joystick to XY movement
the two CAN handles. the control unit for the CAN handles. (see page 50).
The microscope has not been balanced Installed accessory was not turned ➩Balance the B-axis again.
exactly in the B-axis. back to the working position when Make sure that the accessory is turned
balancing the B axis. back to the working position when
balancing the B-axis (see page 28).
Perform intraoperative B/C balancing
(see page 30).
The push-button for automatic balancing Balancing process still not complete. ➩Rotate the microscope to the B-position
is flashing, but the acoustic signal is not and press the Autoblance push-button.
sounding (nothing is happening).
Swing arm cannot be moved. Swing arm locked in position. ➩Release the lock (see page 22).
The stand of the Leica M525 OH4 moves. Footbrake not applied. ➩Lock the footbrake in position (see page 35).
The range of movement of the Cable laid too tightly. ➩Re-lay the cable (see assembly instructions
Leica M525 OH4 is limited Leica M525 OH4).
(swing, tilt, rotate, XY movement).
Video camera was not correctly ➩Mount the video camera correctly.
mounted and touches the swing arm.
Leica M525 OH4 is not correctly Position of accessory was changed ➩ Balance the Leica M525 OH4
balanced. after balancing. (see page 27).
➩Perform intraoperative AC/BC balancing
of the Leica M525 OH4 (see page 30).

Fault Cause Remedy
Leica M525 OH4 cannot be balanced. The weight disk which you are using on ➩Changing the weight disk on the D axis
the D-axis cannot balance installed (see page 33).
accessories.
Leica M525 OH4 was balanced in the ➩Move the Leica M525 OH4 out of the
transport position. transport position and balance it again.
Focus on microscope cannot Multifocus switch is "on". ➩Switch off the multifocus (see page 42).
be adjusted. Exception: you are using a laser
micromanipulator which has this function
as a safety precaution.
➩Install the accessories exactly in

The image appears shaded through the Accessories not installed exactly. the holders (see page 22).
microscope at the edges and the
illumination field is outside the
field of vision.
TV, photography
Fault Cause Remedy
Photographs/TV pictures unfocussed. Microscope or Zoom Video Adapter ➩Focus precisely, insert graticule if
not precisely focussed. necessary.
➩Perform diopter correction exactly
as instructed.
Zoom Video Adapter is not set parfocal. ➩Set the Zoom Video Adapter
parfocal as instructed.
The photographs have a blue tone. An incorrect film was used. ➩Load daylight film.

What to do if...?
Error messages on the control unit

Fault Cause Remedy
"Check lamp 1/2" Lampe 1/2 is defective. Check and replace defective
lamp 1/2 after surgery.
"Device not present" A cable connection has loosened Contact your Leica represantative.
or is defective.
"No Connection to MDRS3" A cable connection has loosened Chek connection cable.
or is defective.
"Rear load too high" Mounted accessories cannot Reduce Load on back side of
be be balanced. optics carrier.
"Front load too high" Mounted accessories cannot Reduce Load on front side of
"Rear load too high" Mounted accessories cannot Reduce Load on back side of
"Front load too high" Mounted accessories cannot Reduce Load on front side of
"Left hand side load too high" Mounted accessories cannot Reduce Load on left side of
"Rught hand side load to high" Mounted accessories cannot Reduce Load on right side of
"Too many counterweight wheels Wheel counterweight used on the Change wheel counterweight on
at D axis" D axis cannot compensate for the the D axis (see page 34)
mounted accessories
"Too less counterweight wheels Wheel counterweight used on the Change wheel counterweight on
at D axis" D axis cannot compensate for the the D axis (see page 34)
mounted accessories
"Illumination unit not closed" Access hatch for lamp inserts Close access hatch and lock
is not closed.Pushbutton for with rotary knob.
illumination flashes.
"Microscope-Device-Controller Contact your Leica represantative.

not present"

Technical data
Optical data
Electrical data
Magnification range 1.2x – 12.8x with 10x eyepiece
Field of view (dia. in mm) 16.5mm – 180mm with 10x eyepiece
Power connection for 1600 VA 50/60 Hz
Leica M525 OH4 100 V (+10%/–15%)
120 V (+10%/–15%) Microscope carrier
220 V (+10%/–15%)
240 V (+10%/–15%) Rotation of optics 540°
Protection class Class 1 Lateral tilt 50° to left / 50° to right
Inclination tilt –30° / +120°
XY speed Zoom linked XY speed
Leica M525 Balancing A,B,C and D axes fully automatic,
each can be corrected manually
Microscope
Intraoperative AC/BC button for automatic
Magnification 6:1 zoom, motorized balancing intraoperative balancing of A&C
axes and for B&C axes
Working distance 207mm – 470mm, variable through
motorized multifocal lens, continu- Brakes 1 brake for A/B axis
ously adjustable; 1 brake for C axis
manually adjustable override Indicator LED for Fluorescence mode status,
Focusing Motorized via multifocal lens; LED for Video record status
manually adjustable
Eyepiece Wide-field eyepieces for spectacle Accessories
wearers 10x and 12.5x
dioptric settings ±5 with adjustable Leica ULT500 180° stereo observer,
eye cup Main/Assistant surgeon 40% each
Objective Multifocal lens; 207–470mm beam path
variable working distance, with Assistant /Video on selectable side
optional WD extender lens 20% each beam path
Illumination Illumination system specially Dual stereo attachment Main surgeon 70% / Assistant 30%
developed for microsurgical appli- Second observer Stereo attachment for second
cations; observer to beam splitter
continuously adjustable
illumination field diameter with Beam splitter 50% / 50%, 70% / 30%
Gauss-shaped light distribution. Binocular tube Variable angle 30° – 150°,
Continuously adjustable brightness variable angle 0° – 180°
at constant color temperature Video Adapter 3:1 zoom,
AutoIris™ Built–in automatic zoom- 35mm – 100mm focal length,
synchronized illumination field c-mount,
diameter, with manual override and with fine focus
reset feature Imaging Leica DI C500 high resolution true
Main light source High performance 300 Watt xenon color dual imaging module for cor-
arc-lamp through fiber optic related and non correlated data
Emergency lamp 300 Watt xenon arc-lamp on display
separate electrical system Asepsis Sterilizable protective glass cover
BrightCare™ Safety technology for the working for the objective, sterilizable
distance synchronized to light components for various controls,
control commercially available drapes
Laser Various commercially available
lasers and laser shutters can be
attached

Technical data
IGS Control unit stand Software independent hard keys

for illumination and auto-balancing.
Interface / Compatibility Open architecture for IGS systems Indicator for Main / backup
illumination and Fluorescence
modes,
Fluorescence Open architecture for future
software developments.
Vascular Fluorescence Optional Leica FL800 is available in Light source Dual Xenon arc-lamp illumination
USA, EU, and most countries system and built in automatic lamp
Oncology Fluorescence Optional Leica FL400 available in quick changer
EU and some other countries Controls 10 function pistol grips for zoom,
(Please check the status of focus, all-free release of six
approval with your Leica brakes, side button for user-
representative). defined brakes, motorized lateral
tilt and inclination (XY) or
Leica DI C500 functions. Except for
Floor stand the all-free button all functions are
freely programmable.
Type Floor stand with six Mouthswitch for releasing the user
electromagnetic brakes defined brakes
Base 720mm x 720mm with four 360° 12 function foot control and
rotatable casters with 130mm handswitch
diameter each, one central single
step foot brake
Integration of Prepared for integration of
Balancing New "no brake release" Auto-
documentation Video- and digital recording
Balance:
systems.
One button / two push for complete
Open architecture
automatic balancing of stand and
optics Connectors Numerous built-in connectors for
Video, IGS and control data
transfer, Internal Power 12 VDC,
Intraoperative Balancing AC/BC button for automatic 19 VDC and AC connections
intraoperative balancing of the AC
Carrier for monitor 700mm long and flexible arm with
axis and for BC axis
4 axis for rotation and inclination to
Swingarm Patented advanced movement sys-
carry optional video monitor
tem for perfect balance in six axes,
new vibration damping technology Materials All solid metal construction
Floorstand control unit New generation touch panel tech- Surface coating System Coated with antimicrobial paint
nology. Minimum height In park position 1945mm
The latest electronics control for Range Cantilever Max. 1925mm
the continuous governing of all
Load Min. 6.7kg and max.
motor functions and the light
12.2kg of accessories to the
intensity.
microscope
Data shown by means of LCD.
Built-in BrightCare™ technology Weight Approx. 320kg with full load
for the working distance
synchronized light control.
ISUS ™ Intelligent Setup System,
Menu selection based on unique
software for user-specific configu-
ration, with built-in electronic auto-
diagnosis and user support.

Technical data
Ambient conditions
In use +10°C to +40°C
+50°F to +104°F
30% to 95% rel. humidity
500mbar to 1060mbar
atmospheric pressure
Storage –40°C to +70°C
–40°F to +158°F
10% to 100% rel. humidity
500mbar to 1060mbar
atmospheric pressure
Standards fulfilled
Conformity CE • Directive 93/42/EEC concerning
medical devices: Class I, in
conformity with Annex IX,
Regulation 1, with reference to
Regulation 10 and 12 of the
directive.
• Medical electric equipment,
Part 1: General requirements
for safety IEC 60601-1;
EN 60601-1; UL60601-1;
CAN/CSA-C22.2 NO. 601.1-M90
• Electromagnetic compatibility
IEC 60601-1-2; EN 60601-1-2
According to the SQS Certificate,
the Business Unit SOM, within
Leica Microsystems (Schweiz)
AG, holds the management
system certificates for the
international standards
ISO 9001:2000 /ISO 13485:2003 and
ISO 14001:2004 relating to quality
management, quality assurance
and environmental management.
Limitations of use
The Leica M525 OH4 may be used only in closed rooms and
must be placed on a solid floor.

Technical data
List of weights of balanceable configurations

Minimum US standard Maximum Maximum
specification specification specification
Fluorescence
Leica Designation Unit Qty. Gross Qty. Gross Qty Gross Qty. Gross
Art. No. weight weight weight weight weight
(kg) (kg) (kg) (kg) (kg)
10446570 Counterweight, M500 2.900 1 2.900 0.000 0.000 0.000
10455349 30° rotary ring 0.184 1 0.184 0.000 0.000 0.000
10446058 Multifocal protective 0.017 1 0.017 1 0.017 1 0.017 0.000
glass
10446587 Binocular tube, straight, 0.795 0.000 0.000 0.000 0.000
T, Type II
10446797 Binocular tube 0.795 2 1.590 3 2.385 3 2.385 2 1.590
tiltable, 30–150°
10446574 Binocular tube 0.700 0.000 0.000 0.000 0.000
tiltable, T, Type II
10446485 Eyepiece size 10x/21B, 0.100 4 0.400 6 0.600 6 0.600 6 0.600
Type II
10446482 Beam splitter M500, 0.360 1 0.360 0.000 0.000 0.000
50/50% light distribution
10446475 Stereo assistant's 0.920 1 0.920 1 0.920 1 0.920 1 0.920
attachment, M500
10446573 Binocular tube, tiltable, 1.400 0.000 0.000 0.000 1 1.400
0–180°, T, Type II
10446592 Zoom video adapter 0.720 1 0.720 1 0.720 1 0.720 0.000
Video camera 0.360 1 0.360 1 0.360 1 0.360 0.000
10446852 DI-Color Module 4.140 0.000 0.000 1 4.140 1 4.140
(DI C500)
10446854 Ultra Observer (ULT500) 3.020 0.000 1 3.020 0.000 0.000
10713669 NIR Dual Video Adapter 1.240 0.000 0.000 0.000 1 1.240
incl. objective
UV camera handle 0.100 0.000 0.000 0.000 1 0.100
10713897 Sony NIR camera 0.040 0.000 0.000 0.000 1 0.040
10713667
10713680 Observation 0.500 0.000 0.000 0.000 1 0.500
filter module
10713648 FL illumination module 0.840 0.000 0.000 0.000 1 0.840
incl. adapter plate
10446469 M680 sterile glass 0.060 0.000 0.000 0.000 1 0.060
Gross weight 7.451 8.022 9.142 11.430

Technical data
Illustrations of measure
±270¡
±50¡
±50¡
±40¡
+120¡
-30¡
±360¡

Technical data
2685
1945
1200
max. 1925
720 x 720

Technical data
1785
1180
430

Technical data

Notes

Notes

Leica Microsystems – the brand
for outstanding products
Leica Microsystems’ mission is to be the world’s first-choice provider of innovative The companies of the Leica Micro-
solutions to our customers’ needs for vision, measurement and analysis of microsystems Group operate internationally
structures. in three business segments, where we
rank with the market leaders.
Leica, the leading brand for microscopes and scientific instruments, developed from
five brand names, all with a long tradition: Wild, Leitz, Reichert, Jung and Cambridge • Microscopy Systems
Instruments. Yet Leica symbolizes innovation as well as tradition. Our expertise in microscopy is the basis
for all our solutions for visualization,
Leica Microsystems – an international company measurement and analysis of micro-
structures in life sciences and industry.
with a strong network of customer services With confocal laser technology and
image analysis systems, we provide
Australia North Ryde, NSW Tel. + 61 2 8870 3500 Fax + 61 2 9878 1055 three-dimensional viewing facilities and
Canada Richmond Hill Tel. + 1 905 762 2000 Fax + 1 905 762 8937 offer new solutions for cytogenetics,
China Beijing Tel. + 86 10 684 92 698 Fax + 86 10 684 92 965 pathology and materials sciences.
Denmark Herlev Tel. + 45 4454 0101 Fax + 45 4454 0111
France Rueil-Malmaison Cédex Tel. + 33 1 473 285 85 Fax + 33 1 473 285 86 • Specimen Preparation
Germany Bensheim Tel. + 49 6251 136 0 Fax + 49 6251 136 155 We provide comprehensive systems
Hong Kong Tel. + 85 22 56 46 699 Fax + 85 22 56 441 63 and services for clinical histo- and
10 714 367en/- • © Leica Microsystems (Schweiz) AG • CH-9435 Heerbrugg, 2006 • Printed in Switzerland – X.2006 – RDV
Italy Milan Tel. + 39 0257 4861 Fax + 39 0257 40 3273 cytopathology applications, biomedical
Japan Tokyo Tel. + 81 3 5421 2803 Fax + 81 3 5421 2891 research and industrial quality assur-
Korea Seoul Tel. + 82 2 514 65 43 Fax + 82 2 514 65 48
ance. Our product range includes
instruments, systems and consumables
Portugal Lisbon Tel. + 35 1 21 388 9112 Fax + 35 1 21 385 4668
for tissue infiltration and embedding,
Illustrations, descriptions and technical data are not binding and may be changed without notice.
Singapore Tel. + 65 6779 7823 Fax + 65 6773 0628
microtomes and cryostats as well as
Spain Barcelona Tel. + 34 93 494 95 30 Fax + 34 93 494 95 32
automated stainers and coverslippers.
Printed on paper made of chlorine free pulp with a high percent recycled fiber content.
Switzerland Glattbrugg Tel. + 41 44 809 34 34 Fax + 41 44 809 34 44
United Kingdom Milton Keynes Tel. + 44 1908 66 66 63 Fax + 44 1908 609 992
USA Allendale/New Jersey Tel. + 1 201 236 5900 Fax + 1 201 236 5908
• Medical Equipment
Innovative technologies in our surgical
microscopes offer new therapeutic
and representatives of Leica Microsystems approaches in microsurgery.
in more than 100 countries.

The Business Unit SOM, within Leica Microsystems (Schweiz) AG, holds the manage-
ment system certificates for the international standards ISO 9001:2000 / ISO 13485:2003,
and ISO 14001:2004 relating to quality management, quality assurance and environmental
management.
Leica
LeicaMicrosystems
Microsystems(Schweiz)
(Schweiz)AG
AG Telephone
Telephone+41
+4171
71726
72633
3333
33
Business
BusinessUnit
UnitSOM
SOM Fax
Fax+41
+4171
71726
72632
3219
19
Max
MaxSchmidheiny-Strasse
Schmidheiny-Strasse201
201 www.leica-microsystems.com
www.leica-microsystems.com
CH-9435
CH-9435Heerbrugg
Heerbrugg

Leica M525 OH4 User Manual

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What are some of the main components of the surgical microscope described in the manual?

What are some of the main components of the surgical microscope described in the manual?

Leica M525 OH4

In developing our systems, we have placed great emphasis on

For valuable information about Leica Microsystems products

Leica Microsystems (Schweiz) AG

Leica M525 OH4 / Ref. 10 714 367 / Version -

Preparation for operation 21

Care and maintenance 68

Leica M525 OH4 / Ref. 10 714 367 / Version - 1

Introduction Safety notes

2 Leica M525 OH4 / Ref. 10 714 367 / Version -

User manual Symbols in this user manual

Product identification Caution Warning regarding use hazard or

Leica M525 OH4 / Ref. 10 714 367 / Version - 3

4 Leica M525 OH4 / Ref. 10 714 367 / Version -

Leica M525 OH4 / Ref. 10 714 367 / Version - 5

Microscope Leica M525 with swing arm

15 CAN socket for accessories (DI C500, FL400)

1 Status LED for fluorescence

6 Leica M525 OH4 / Ref. 10 714 367 / Version -

11 Storz light source 18 for Sony NIR camera

4 AD.F. Additional Function 2

Leica M525 OH4 / Ref. 10 714 367 / Version - 7

7 9 Lamp inserts for main illumination or backup illumination

8 Leica M525 OH4 / Ref. 10 714 367 / Version -

CAN handles Mouth switch

6 Release preselected brakes

Footswitch Footswitch Footswitch Footswitch

Leica M525 OH4 / Ref. 10 714 367 / Version - 9

10 Leica M525 OH4 / Ref. 10 714 367 / Version -

Preset "Image Injection IGS DI C500"

Leica M525 OH4 / Ref. 10 714 367 / Version - 11

Preset "Image Injection ENDO DI C500"

DI C500: Display on/off DI C500:Shutter control X- X+

12 Leica M525 OH4 / Ref. 10 714 367 / Version -

Preset "Fluorescence Vascular FL800"

FL800 NIR Zoom Reset Y+

FL800 Mode on/off MDRS3 FL: Playback&Enter X- X+

FL800 Mode on/off FL800 NIR

MDRS3 FL:Menu&Down MDRS3 FL:

Leica M525 OH4 / Ref. 10 714 367 / Version - 13

Preset "Fluorescence Oncology FL400"

FL400 Mode on/off No function X- X+

FL400 Mode on/off No function

14 Leica M525 OH4 / Ref. 10 714 367 / Version -

Preset "Fluorescence Oncology FL400 & IGS DI C500"

FL400 Mode on/off No function

Leica M525 OH4 / Ref. 10 714 367 / Version - 15

Preset "Fluorescence Oncology FL400 & Vascular FL800"

FL800 NIR Zoom Reset Y+

FL800 Mode on/off MDRS3 FL: Playback&Enter X- X+

FL800 NIR Zoom Reset

FL400 Mode on/off No function

MDRS3 FL: Menu&Down

16 Leica M525 OH4 / Ref. 10 714 367 / Version -

A comprehensive range of accessories enables the 180° second observer attachment

• Allows a second observer to view the procedure