Service Manual Mains Control Unit Version: 1.

Service Manual
Mains Control Unit
BV Family Rel. 2.1

Author: Eckl Martin Status: RELEASED Page 1 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

TABLE OF CONTENTS

SECTION 1: TECHNICAL DATA ....................................................................................................... 3

1 Introduction ................................................................................................................................... 3
2 Tools ............................................................................................................................................. 3
3 Items supplied............................................................................................................................... 3
4 Identification.................................................................................................................................. 4
5 Compability ................................................................................................................................... 4
6 Technical Data.............................................................................................................................. 4

SECTION 2: INSTALLATION INSTRUCTIONS .............................................................................. 10

1 Introduction ................................................................................................................................. 10
2 Tools ........................................................................................................................................... 10
3 Installation Instructions ............................................................................................................... 10
4 Adapting to the local Mains voltage............................................................................................ 12
5 Setting to work ............................................................................................................................ 15
5.1 System configuration ........................................................................................................... 15

SECTION 3: REAPAIR AND MAINTAINANCE................................................................................ 16

1 Introduction ................................................................................................................................. 16
2 Tools ........................................................................................................................................... 16
3 Spare parts ................................................................................................................................. 16
4 Maintenance ............................................................................................................................... 16
5 Explanation of the MCU functions .............................................................................................. 17
5.1 Connectors on the Switch-On-Board................................................................................... 17
5.2 Connectors on the MCU...................................................................................................... 19
6 Fault finding and repairing .......................................................................................................... 22
7 Switching logic ............................................................................................................................ 26
7.1 Repair procedure .................................................................................................................... 27
8 History list ................................................................................................................................... 27

Author: Eckl Martin Status: RELEASED Page 2 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

SECTION 1: TECHNICAL DATA

1 Introduction

This sign stands for: Read the manual carefully

This sign stands for: Be careful HIGH VOLTAGE !

2 Tools

A standard toolkit is required to unpack, install, repair and maintain the MCU.
No special tools are required or need to be ordered.

3 Items supplied

The BV Family Release 2.1 delivery contains the following items:

- The MCU including two spare fuses. (These are mounted with clamps on the MCU)
There is 1 fuse: Bussmann KTK 15A and 1 fuse FA 10A.
- Documentation including Service location key (label)

3.1 Mains Control Unit

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 Service Manual Mains Control Unit Version: 1.1

4 Identification

The type number plate is located on the right rear side of the MCU, near terminal block X200.

5 Compability

The MAINS CONTROL UNIT is designed to be compatible with the BV Family Release 2.1

NOTE
For further instructions refer to SECTION 2 and 3 of this manual or to the Installation section of the
Installation System manual

6 Technical Data

6.1 Introduction

The MAINS CONTROL UNIT is the interface between the mains and the system and allows
connection of the system to different mains supplies. It has an isolating transformer suitable for use in
medical equipment to separate the system from the mains. The unit delivers output voltages to the
Mobile Viewing Station (MVS) and the Stand.

6.2 Dimensions and Weight

Dimensions:
Mains Control Unit 389 x 311 x 132 mm (LxWxH)
Mains Transformer 290 x 91mm (DxH)

Weight:
Mains Control Unit 6,50 kg
Mains Transformer 22,0 kg

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 Service Manual Mains Control Unit Version: 1.1

6.3 Electrical Data

Input voltages: 100-110-120-130-200-20-220-230-240Vac ± 10%

Nominal frequency is 50Hz or 60Hz ± 1Hz
adjustable by tabs and connectors.

Output voltages: 28, 125, 230, 600Vac, 24Vdc

Mains resistance: 100V < 0,10 Ohm

120-130V < 0,12 Ohm
200-240V < 0,60 Ohm

6.4 Explanation of Operation

The MCU can be switched on and off using the ON/OFF-circuits of the system, or by using the
ON/OFF-switches on the Switch-On-Board.

Relay WA-K1 (mains relay) becomes active when the MCU is switched on. The mains current runs
through the damping resistors R1 – R5, allowing a “soft start” off the system without damaging the
mains fuses F1 and F2. After a time of about 100ms, the relay K10 on the Switch-On-Board will
become active. With this, the damping resistors R1 – R5 are by-passed by thyristor module TH1.

Depending on the connected Stand-System and the position of connector WA-X5 (stand select), the
relays WA-K2 (power to MVS) and WA-K3 (power to the Stand) can be switched on.

If a power failure (e.g. voltage loss of the mains) occurs, the thyristor will be switched off and the
current will run through the damping resistors again for about 100ms. This prevents the fuses from
blowing when the power comes back on.

Pressing any OFF button (MCU or MVS) switches WA-K1 to WA-K3 off. Also refer to section 6.3.
Notice:
- Pressing the Stand-Off-Button switches only WA-K3 off.
- Pressing the OFF button at a RA-System switches only relay WA-K2 off, WA-K1 and WA-K3
remain on due to battery-loading is served.

Disconnecting the stand while the MCU is on, turns relay WA-K3 off immediately. This switches off the
230V and the 600V voltage on the Stand-cable.

Connecting a RA-System Stand will cause the MCU to serve 230V for battery-loading to the Stand as
soon as the system is connected to the mains supply.

If the damping resistors R1 – R5 get too hot (± 10°C) the thermal switch F10 will power off the whole
unit. The MCU will go in Error-Mode, indicated by LED H2 on the Switch-On-Board.

It can be switched on again only if:

1. the resistors have cooled down and
2. the MCU has been disconnected from the mains for about 20-30sec.

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Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 301 302 WA1X3.1 WAX4.1
WA1X3.2 WAX4.2

Dept.: DRE
WA1X3.3 WAX4.3
K3 A1 K2 A1 K1 A1 W1AX3.4 K2-4 WAX4.4
WA1X3.5 K2-8 WAX4.5
F1 F2

Author: Eckl Martin

Date: 2005-11-23
WA1X3.6 WAX4.6
A2 A2 A2 WA1X3.7 WAX4.7
WA1X3.8 WAX4.8
PE4
WA1X7.1 WA1X3.9 WAX4.9
C1 WA1X3.10 WAX4.10
WA1X7.3
WA1X3.11 WAX4.11
WA1X3.12 WAX4.12
WA1X3.13 WAX4.13
WA1X3.14 WAX4.14
1 3 5 7 WA1X3.15 WAX4.15

K1

2 4 6 8 PE2
K3
1
2

T1
101 113 WAX2.1 WAX5.1 WAX1.1
Sw Ws
6.5 Circuit Diagram Mains Control Unit

F6 WAX2.2 WAX5.2 WAX1.2

3
4

WAX2.3 WAX5.3 WAX1.3

[5]
5
6

108 WAX2.4 WAX5.4 WAX1.4

3 [2] 102 Bn 115 [6] F7 WAX2.5 WAX5.5 WAX1.5
Bn
7
8

R3 R1 WAX2.6 WAX5.6 WAX1.6

TH 1
114 F8 WAX2.7 WAX5.7
Bl
6 WAX2.8 WAX5.8

04157-Z501-720
WA1X6.3 [3] 103 Rd PE4
WAX2.9 WAX5.9

Status: RELEASED
7 1
WA1X6.1
R4 R2
104 Or Rs 116 WAX3.1
F9
WAX3.2
5
WA1X6.2 WAX3.3
105 112
4 2 Ge Rd
WA1X6.4 WAX3.4
[4]
R5 WAX3.5
109 WAX3.6
Service Manual Mains Control Unit

F1 0
WAX3.7
Or 111
WAX3.8
WAX3.9 206
[1] 106 F3 205
7
8

204
Bl
F4
5
6

207
3
4

107 110 F5 210

Ad dition al earh ing con nce tio ns: Ye
Philips Medical Systems Best
1
2

PE1 - e arthing point for mains cable Vl 209

PE2 - e arthing for brake 208
Sc halt plan Mains Cont rol Unit
PE3 - e arthing for sta nd ca ble K2
PE4 - e arthing for ch assis an d height adjust ment Nr. 04157-Z501-101
PE2 203
Version: V3.1
202
201 Dat um: 25.05.2005
PE1
Erstellt: Martin Eckl

Page 6 of 27
Version: 1.1
 Service Manual Mains Control Unit Version: 1.1

6.6 Diagram of the Switch On/Off Logic

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 Service Manual Mains Control Unit Version: 1.1

6.7 Diagram of the Mains Dip Detection and Thyristor Logic

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Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

6.8 Diagram of Power Supply and Connectors

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Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

SECTION 2: INSTALLATION INSTRUCTIONS

1 Introduction

This sign stands for: Read the manual carefully

This sign stands for: Be careful HIGH VOLTAGE !

2 Tools

A standard toolkit is required to unpack, install, repair and maintain the MCU.
No special tools are required or need to be ordered.

3 Installation Instructions

3.1 Mounting

The MAINS CONTROL UNIT is designed to be built into a system (see section 1)

NOTE
Please refer to mounting instructions of the Service system manual: System manual Corrective
Maintenance, Section Replacement procedures.

3.2 Earthing

NOTE
Please refer to mounting instructions of the Service system manual: System manual Corrective
Maintenance, Section Replacement procedures.

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 Service Manual Mains Control Unit Version: 1.1

The mains earth must be mounted in the way shown below.

4
2

3
1

Key:
1 star washer
2 washer
3 protective earth wire from mains cable
4 other protective earth wire(s)
5 nuts

WARNING

THE EARTHING MUST BE CHECKED AFTER INSTALLATION

THE EARTH WIRE OF THE MAINS PLUG AND THE EARTH-TERMINAL OF THE MCU MUST HAVE
AN ELECTRICAL CONNECTION. CHECK THIS WITH AN MEASURING DEVICE.

3.3 Service Location Key (Label) of the MCU

Take the service location key of the MCU (label) which is filed on top of this manual. Stick the MCU
label on the inner side of the MVS rear cover or over the present MCU service location key (in case of
a MCU replacement).

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 Service Manual Mains Control Unit Version: 1.1

4 Adapting to the local Mains voltage

WARNING

TO REDUCE THE RISK OF CONTACT WITH A LIVE MAINS CIRCUIT, DISCONNECT THE MAINS
PLUG AND SHORT CIRCUIT THE PINS OF THE PLUG BEFORE SERVICING ON THE MCU

4.1 Mains Transformer

Wieland screw terminal

block X100.
Refer to Service Location
Key for correct position of
terminal.
Connect transformer on the
inner side of the MCU (this
point of view).

Check the nominal mains voltage of the hospital and then make following connections:

NOTE
Check WA1 X4 / X5 connector according table below.
Improper connection will cause damage.

Table 1: Mains voltage programming

Mains Fuses Transformer lead connected to: Input to
Voltage F1, F2 1 2 3 4 5 WA1-PCB
100 V 15A / 30A FA* 105 101 104 106 109 WA1-X5
110 V 15A / 30A FA* 102 101 104 105 109 WA1-X5
120 V 15A / 30A FA* 106 101 104 105 109 WA1-X5
130 V 15A / 30A FA* 107 101 104 105 109 WA1-X5
200 V 15A FA 105 102 103 107 108 WA1-X4
210 V 15A FA 105 102 103 106 108 WA1-X4
220 V 15A FA 104 102 103 105 108 WA1-X4
230 V 15A FA 106 102 103 105 108 WA1-X4
240 V 15A FA 107 102 103 105 108 WA1-X4
* Depending on actual system configuration see 0-level documentation part 1.

For example: If the mains voltage is 230V, following connections must be made:

→ Wire 1 to wieland terminal 106

→ Wire 2 to wieland terminal 102
→ Wire 3 to wieland terminal 103
→ Wire 4 to wieland terminal 105
→ Wire 5 to wieland terminal 108

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 Service Manual Mains Control Unit Version: 1.1

WARNING

A WRONGLY ADJUSTED MCU CAN CAUSE DAMAGE TO THE UNIT AND/OR RISK
THE HEALTH OF PEOPLE
IT CAN BE DANGEROUS IF THE VOLTAGE ADJUSTMENT OF THE MCU HAS NOT BEEN
CORRECTLY CARRIED OUT BEFORE CONNECTION TO THE MAINS SUPPLY

4.2 Mains Fuses

Table 2: mains fuses

Mains voltage: Mains fuses F1& F2 are for: Mains fuses F1& F2 are for:
FA – systems RA – systems
100V ... 130V 30A Fast Acting 15A Fast Acting
200V ... 240V 15A Fast Acting 15A Fast Acting

The used fuse types are:

• The 15A mains fuse type for F1 and F2 is: Bussmann KTK15 (=15A)
• The 30A mains fuse type for F1 and F2 is: Bussmann KTK30 (=30A)

CAUTION

TO AVOID RISK OF FIRE, ONLY REPLACE FUSES WITH THE SAME TYPE/RATINGS

INSTRUCTION

CROSS OUT THE INCORRECT FUSE RATING ON THE FUSE LABEL NEAR THE FUSES WITH A
BLACK, NON REMOVEABLE MARKER.

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 Service Manual Mains Control Unit Version: 1.1

4.3 Switch ON / OFF Board WA1

Configuration:

Voltages from 100V to 130V: Mains plug WA1X7 has to be connected to WA1X5

Voltages from 200V to 240V: Mains plug WA1X7 has to be connected to WA1X4

WA1-X5
WA1-X8

SW1 WA1-X4

SW3

SW2

LEDs H4 – H1
(left to right)

WARNING

TO AVOID THE RISK OF FIRE, TAKE EXTRA CARE WHEN CONNECTING THE PCB.
CONNECTING PLUG WAX7 IN THE WRONG POSITION CAN CAUSE PERSONAL HARM, AND
COULD ALSO CAUSE DAMAGE TO THE TRANSFORMER ON THE PCB

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 Service Manual Mains Control Unit Version: 1.1

5 Setting to work

5.1 System configuration

WA1-X2
WA1-X3 WA1-X1 WA-X2 WA-X3

WA1-X9 WA1-X7 WA-X5

Table 3: System Configuration

Connect Bridge of
System: SW3-1 SW3-2 SW3-3
WA-X5 to: X115 - X116
FA-System WA-X2 OFF OFF OFF wire 6 inserted
RA-System WA-X3 ON OFF OFF wire 6 removed

Table 4: Default Jumper setting

System: WA1-X7 WA1-X9
FA-System open open
RA-System open open

Attention:
- Jumper WA1-X7 allows PE – GND (pcb) interconnection if closed
- Jumper WA1-X9 prevents Thyristor ignition if closed – ONLY FOR SERVICE PURPOSES

CAUTION

INCORRECT CONNECTIONS CAN CAUSE MALFUNCTIONS TO THE UNIT

NOTE
If wire 6 has to removed, you can either remove it completely, or stick the two ends into one terminal.

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 Service Manual Mains Control Unit Version: 1.1

SECTION 3: REAPAIR AND MAINTAINANCE

1 Introduction

This sign stands for: Read the manual carefully

This sign stands for: Be careful HIGH VOLTAGE !

NOTE
Repair and Maintenance must be carried out by qualified personal only!
There are no user serviceable parts in this device.

2 Tools

A standard toolkit is required to unpack, install, repair and maintain the MCU.
No special tools are required or need to be ordered.

3 Spare parts

Universal Mains Control Unit: 4522 300 19851

Switch-On-Board: 4522 300 19871

4 Maintenance

There are no parts requiring maintenance in the MCU. However the MCU should be cleaned
occasionally with a vacuum cleaner and a brush to remove to dust.

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 Service Manual Mains Control Unit Version: 1.1

5 Explanation of the MCU functions

5.1 Connectors on the Switch-On-Board

WA1-X1 Signal Name Function

1 n.c. --------------------
2 n.c. --------------------
3 n.c. --------------------
4 SLSYON_L low active signal – switch MVS or Stand on
5 n.c. --------------------
6 GND low active signal – switch MVS off
7 SLSYOFF_L low active signal – switch Stand on
8 SLSTOFF_L reference of 24VDC
9 Vcc +24VDC board voltage supply
Table 1 Connector WA-X1

WA1-X2 Signal Name Function

1 SLSYON_L low active signal – switch MVS or Stand on
2 SLSTOFF_L low active signal – switch Stand on
3 KEY1_L safety signal indicates connected Stand
4 KEY_RA_L open @ FA-Stand, closed GND @ RA-Stand
5 SLSYOFF_L low active signal – switch MVS off
6 STAND_ON_H Activated when Stand is connected and switched on
7 n.c. --------------------
8 AC24V-1 separate AC voltage for synchronisation of Stand
9 GND reference of 24VDC
10 n.c. --------------------
11 n.c. --------------------
12 K3A1 external safety loop-back for Stand relay K3
13 Vcc +24VDC board voltage supply
14 n.c. --------------------
15 AC24V-2 separate AC voltage for synchronisation of Stand
Table 2 Connector WA-X2

WA1-X3 Signal Name Function

1 Vcc +24VDC board voltage supply
2 V_MAIN active low signal – switch K1 on = Power to MCU
3 V_MVS active low signal – switch K2 on = Power to MVS
4 V_STAND active low signal – switch K3 on = Power to Stand
5 Vcc +24VDC board voltage supply
6 TEMP_AL external signal in case of too hot resistors R1 – R5
7 KEY_RA_L open @ FA-Stand; closed GND @ RA-Stand
8 LOOP_FA safety loop-back in case of a connected RA-Stand
9 LOOP_RA safety loop-back in case of a connected FA-Stand
10 KEY1_L safety signal – closed to GND in connected Stand
11 KEY2_L safety signal – enable Stand relay K3
12 n.c. --------------------
13 K3A1 external safety loop-back for Vcc of Stand relay K3
14 n.c. --------------------
15 SEL_RA loop-back enable Power to Stand only at RA-System
Table 3 Connector WA-X3

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 Service Manual Mains Control Unit Version: 1.1

WA1-X4 Signal Name Function

1 MAIN 1 Connects mains life voltage to Switch-On-Board
2 n.c. --------------------
3 MAIN 2 Connects mains neutral voltage to Switch-On-Board
Table 4 Connector WA-X4

WA1-X5 Signal Name Function

1 MAIN 3 Connects mains life voltage to Switch-On-Board
2 n.c. --------------------
3 MAIN 2 Connects mains neutral voltage to Switch-On-Board
Table 5 Connector WA-X5

WA1-X6 Signal Name Function

1 A1K2 common contact of anode and cathode 1st thyristor
2 G1 gate contact of thyristor 1
3 G2 gate contact of thyristor 2
4 A2K1 common contact of anode and cathode 2nd thyristor
Table 6 Connector WA-X6

WA1-X7 Signal Name Function

1 Life mains voltage Connect life mains voltage to WA1-X4 / WA1-X5
2 -------------------- --------------------
3 Neutral mains voltage Connect neutral mains voltage to WA1-X4 / WA1-X5
Table 7 Connector WA-X7

WA1-X8 Signal Name Function

1 Vcc +24VDC supply voltage for System Energised Lamp
2 n.c.
3 GND GND supply voltage for System Energised Lamp
Table 8 Connector WA-X8

WA1-X9 Signal Name Function

1 GND-PE Interconnection between GND-PE and GND
2 GND Interconnection between GND-PE and GND
Table 9 Connector WA-X9

DIP Switch 3 Function

SW3-1 for FA-System select OFF, for RA-System select ON
SW3-2 keying safety loopback override
SW3-3 keying safety loopback for relay K3 override
Table 10 DIP-Switch SW3

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 Service Manual Mains Control Unit Version: 1.1

5.2 Connectors on the MCU

NOTE
Power on WA-X1 depends on the system type

X300 Signal Name Function

X301 L1 Life mains voltage
X302 N Neutral mains voltage
Table 11 Terminal block X300

X200 Signal Name Function

X201 PE Earth
X202 PE Earth
X203 PE Earth
X204 PE Earth
X205 AC_ref_MVS Reference for AC voltage 50/60Hz
X206 AC_ref_MVS Reference for AC voltage 50/60Hz
X207 AC_ref_MVS Reference for AC voltage 50/60Hz
X208 AC_ref_MVS Reference for AC voltage 50/60Hz
X209 AC125_MVS 125Veff 50/60Hz
X210 AC230_MVS 230Veff 50/60Hz
X208 AC230_MVS 230Veff 50/60Hz
X209 AC230_MVS 230Veff 50/60Hz
X210 AC230_MVS 230Veff 50/60Hz
Table 12 Terminal block X200

X100 Signal Name Function

X101 first 110V winding of primary side – mains neutral line
X102 first 110V primary winding
X103 second 110V primary winding
X104 second 110V primary winding
X105 first 10V primary winding
X106 common connection of first and second 10V primary winding
X107 second 10V primary winding
X108 connection for 6,0 Ohm starting resistance
X109 connection for 3,6 Ohm starting resistance
X110 connection for AC230V_MVS
X111 connection for AC125V_MVS
X112 connection for AC230V_MVS reference
X113 reference of 370V winding = AC600V_Stand reference
X114 connection for AC230V_Stand
X115 370V winding - connect to X116 for AC600V_Stand
X116 connection for AC230V_Stand reference
Table 13 Terminal block X100

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 Service Manual Mains Control Unit Version: 1.1

PE Signal Name Function

PE1 Earth Mains Earth Point
PE2 Earth Connection mains transformer screen
PE3 Earth Connection Stand cable screen
PE4 Earth n.c.
Table 14 Earthing bolts PE

FA-Stand selected:
WA-X1 Signal Name Function
1 AC600_Stand 600Veff 50/60Hz
2 Screen Screen to earth
3 AC230_MVS to Stand 230Veff 50/60Hz
4 AC600_Stand Reference 600Veff 50/60Hz
5 Screen Screen to earth
6 AC230_MVS to Stand Reference 230Veff 50/60Hz
Table15 Connector WA-X1 (FA-System)

RA-Stand selected:
WA-X1 Signal Name Function
1 AC230_Stand 230Veff 50/60Hz
2 Screen Screen to earth
3 AC230_Stand 230Veff 50/60Hz
4 AC230_ref_Stand Reference 230Veff 50/60Hz
5 Screen Screen to earth
6 AC230_ref_Stand Reference 230Veff 50/60Hz
Table16 Connector WA-X1 (RA-System)

WA-X2 Signal Name Function

1 AC600_Stand 600Veff 50/60Hz
2 KEY1_L Closed to “GND” in Stand when connected
3 AC230_MVS to Stand 230Veff 50/60Hz
4 AC600_Stand Reference 600Veff 50/60Hz
5 n.c.
6 AC230_MVS to Stand Reference 230Veff 50/60Hz
7 LOOP_FA closed to KEY_RA_L if a FA-Stand is connected
8 KEY_RA_L open @ FA-Stand, closed GND @ RA-Stand
9 KEY2_L Keying signal, closed to GND at FA-System
Table17 Connector WA-X2

WA-X3 Signal Name Function

1 AC230_Stand 230Veff 50/60Hz
2 KEY1_L Connected to “GND” in Stand
3 AC230_Stand 230Veff 50/60Hz
4 AC230_ref_Stand Reference 230Veff 50/60Hz
5 n.c.
6 AC230_ref_Stand Reference 230Veff 50/60Hz
7 LOOP_RA closed to KEY_RA_L if a RA-Stand is connected
8 KEY_RA_L open @ FA-Stand, closed GND @ RA-Stand
9 SEL_RA Keying signal, closed to GND at RA-System
Table18 Connector WA-X3

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 Service Manual Mains Control Unit Version: 1.1

FA-Stand selected:
WA-X5 Signal Name Function
1 AC600_Stand 600Veff 50/60Hz
2 loop with WAX5-9 refer to the description WAX2 / WAX3
3 AC230 MVS to Stand 230Veff 50/60Hz
4 AC600_Stand Reference 600Veff 50/60Hz
5 n.c.
6 AC230 MVS to Stand Reference 230Veff 50/60Hz
7 loop with WAX5-8 refer to the description WAX2 / WAX3
8 loop with WAX5-7
9 loop with WAX5-2
Table19 Connector WA-X5 (FA-System)

RA-Stand selected:
WA-X5 Signal Name Function
1 AC230_Stand 230Veff 50/60Hz
2 loop with WAX5-9 refer to the description WAX2 / WAX3
3 AC230_Stand 230Veff 50/60Hz
4 AC230_ref_Stand Reference 230Veff 50/60Hz
5 n.c.
6 AC230_ref_Stand Reference 230Veff 50/60Hz
7 loop with WAX5-8 refer to the description WAX2 / WAX3
8 loop with WAX5-7
9 loop with WAX5-2
Table 20 Connector WA-X5 (RA-System)

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 Service Manual Mains Control Unit Version: 1.1

6 Fault finding and repairing

6.1 Service location key

F7 F8 F9
WA-X2 F2
WA-X3

F1
PE4
F6 F5 F4 F3

WA-X4
(15p)
R1
WA-X1
(6p)
R2
K3 K2
WA1 PCB (Stand) (MVS)

4522 xxxx R3 TH1

R4
X6

R5

X9

X7
X30
K1
(Mains)

LN
PE1

X1 X2 X3
PE3 PE2 12
SW2 SW1
H4
H3
H2 X8
H1 SW3
AC-REF
AC-REF
AC-REF
125V
230V
230V
230V
PE
PE
PE

1 1
X5
X100 X200

Mains Transformer T1
(mounted below MCU)
X4
WA MCU
4522 xxxx

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 Service Manual Mains Control Unit Version: 1.1

6.2 Faultfinding tree

This faultfinding tree only covers faults in the MCU and is based of the use of a FA-System.
Refer also to the power drawings in the ??.

Start

Ensure that the trolley and the stand are of the same release
(same release numbers)

Disconnect the stand from the trolley

Switch DIP Switch SW3-2 (keying override)

and SW3-3 (safety loopback) to ON.
WARNING:
This results in a high voltage on the connecotor plug

Plug in Mains conncetor

Main voltage Check /

Is LED H1 on? NO between WA NO replace
X301-X302? Power-cord

YES YES

Check
Switch on with wiring.
Is Fuse F1 / F2 ok? YES
service button? Replace
WA1

See
Switch off after
next NO YES
NO
a few seconds?
Page
NO
Replace
Automatic switch Fuses F1 /
YES Fuse blown?
off within 1sec? F2 and
switch on

WA1X6:
R1 too hot.
1-2 = 50 Ohm? YES YES
K1 (s1) open? YES
3-4 = 50 Ohm?

Replace
LED H2 on? Check
NO NO complete
YES MCU Error switch logic
MCU unit

Replace
Mains Dip?
MCU unit

Replace
YES complete
unit

Replace Check
WA1 pcb Mains

Author: Eckl Martin Status: RELEASED Page 23 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

Cont.

Voltage 230V Activate K3 manually and measure

WA K3
on X1:3 - X1:6?
NO NO the voltage between
switching?
WAX1:3 and WAX1:6

YES

Check
Check /
relays.
replace Voltage OK? NO
Replace
F6 and F7
MCU

YES
YES

Replace
WA1 pcb

Check /
Voltage 230V WA K2
NO YES replace
on X200 acc. switching?
F3 and F5
Spec.?

Replace
NO WA1 pcb /
YES
WA K2

NO

Voltage 125V Check /

NO WA K2 switching? YES
on X209-X206? replace F4

YES

Voltage 600V Check

NO WA K3 switching? YES
on X1:1 - X1:4? wiring
If the mains control unit
passes these tests when
in stand alone, but fails
YES NO
when the Stand and the
mobile viewing station
are connected, continue
Check with the next tree.
Switch OFF
bridge
SW3-2 and
WAX115 -
SW3-3
X116

Author: Eckl Martin Status: RELEASED Page 24 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

Start with Stand and Mobile Viewing Station connected

Check that DIP Switch SW3-2 (keying override)

and SW3-3 (safety loopback) are posiitioned to OFF.

Check
Do Stand
wiring.
and MVS NO Keying present?
Replace
switch ON?
WA1

YES

Is there an Check
Corret
immediate wiring.
YES keying signals
cut off? Replace
present?
WA1

NO

Check wiring
The system and
Check 26Vac
powers ON / OFF a YES NO Stand-cable.
sync. Voltage
few times? Check FET
NO ok?
power control.

YES

Check Check X6: Check

wiring. YES
1-2: ~ 50Ohm wiring.
NO
Replace 3-4: ~ 50Ohm Replace
WA1 OK? WA1

Does the system switch Replace WA1

Is the damping
off when there are heavy demands pcb.
YES circuit still in? YES
on the MCU during fluoroscopy (no thyristor
Is R5 too hot?
and radiography? control)

Replace unit.
YES YES (thyristor
defect)

Check X-ray
Circuit current much
NO generator
greater than 600V?
tank

Author: Eckl Martin Status: RELEASED Page 25 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

7 Switching logic

NOTE
These tables explain the switching logic of the MCU.
An „1“ in the table stands for relay is on, a „0“ means relay is off.

Action K1 K2 K3 Function
Press ON-key on MVS 1 1 0 MVS is powered
Press OFF-key on MVS 0 0 0 no power on
Press ON-key on PCB 1 1 0 MVS is powered
Press OFF-key on PCB 0 0 0 no power on MVS
Table 20 Switching logic for FA-System without Stand connected

Action K1 K2 K3 Function
Press ON-key on MVS 1 1 1 MVS and Stand are powered
Press OFF-key on MVS 0 0 0 no power on MVS and Stand
Press ON-key on PCB 1 1 1 MVS and Stand are powered
Press OFF-key on PCB 0 0 0 no power on MVS and Stand
Press ON-key on Stand 1 1 1 MVS and Stand are powered
Press OFF-key on Stand 0 0 0 no power on MVS and Stand
Table 21 Switching logic for FA-System with Stand connected

Action K1 K2 K3 Function
Connecting system to mains 1 0 0 MVS is off, transformer is on
Press ON-key on MVS 1 1 0 MVS is powered
Press OFF-key on MVS 1 0 0 MVS is off, transformer is on
Press ON-key on PCB 1 1 0 MVS is powered
Press OFF-key on PCB 1 0 0 MVS is off, transformer is on
Table 22 Switching logic for RA-System without Stand connected

Action K1 K2 K3 Function
Connecting system to mains 1 0 1 Stand has power for battery loading,
Stand and MVS are off
Press ON-key on MVS 1 1 1 Stand and MVS are powered
Press OFF-key on MVS 1 0 1 Stand has power for battery loading,
Stand and MVS are off
Press ON-key on PCB 1 1 1 Stand and MVS are powered
Press OFF-key on PCB 1 0 1 Stand has power for battery loading,
Stand and MVS are off
Table 23 Switching logic for RA-System with Stand connected

Author: Eckl Martin Status: RELEASED Page 26 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720
 Service Manual Mains Control Unit Version: 1.1

7.1 Repair procedure

Replacement of Switch-On-Board
• remove all plugs from PCB, remember position of the plugs
• Loosen and remove the 6 nuts
• remove defect PCB
• check “programming” of the PCB => refer to Installation Section of this manual
• insert new PCB
• apply and tight the 6 nuts with the nut driver
• insert all plugs
• start MCU-test again => refer to fault finding tree

8 History list

Version Datum Author Changes

1.1 23.11.2005 Eckl Martin new designed

Author: Eckl Martin Status: RELEASED Page 27 of 27

Dept.: DRE
Date: 2005-11-23 04157-Z501-720