Siemens Polymobil 3 - Trouble Shooting Guide
Siemens Polymobil 3 - Trouble Shooting Guide
Siemens Polymobil 3 - Trouble Shooting Guide
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POLYMOBIL III/Plus
SP
Troubleshooting Guide
System
Serial numbers 20,000 and higher
10187803
10187800
Siemens
2007
Print No.:
Replaces:
SPR8-125.840.10.04.02
SPR8-125.840.10.03.02
English
Doc. Gen. Date: 05.09
Revision / Disclaimer
1Revision / Disclaimer
POLYMOBIL III/Plus
SPR8-125.840.10.04.02
05.09
Page 2 of 104
CS SD SP/ CO
Siemens
Table of Contents
0Table of Contents
2 _______ Overview______________________________________________________ 12
POLYMOBIL III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D916 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D922, filament inverter, ON/OFF switching circuit . . . . . . . . . . . . . . . . . . . . . . . . . .
U1 power supply unit 5 V 5% / 15 V 10% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
U2 power supply unit 12.5 V 10% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D98 Display board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D1/ Measurement circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C1/ Inverter capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pre-load and discharge resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status of the LEDs (optimum condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13
13
15
17
17
17
17
17
17
17
POLYMOBIL Plus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D916 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D927 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
U1 power supply unit 5 V 5% / 15 V 10% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
U2 power supply unit 12.5 V 10% . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D952 capacitor charging circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D971 (capacitor bank). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D98 Display board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C1 main inverter capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
K22 switch-on relay. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Discharge resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Status of the LEDs (optimum condition) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19
19
22
23
23
23
24
24
24
24
24
25
25
Siemens
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Page 3 of 104
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26
26
26
27
27
28
28
28
29
29
30
30
31
31
32
POLYMOBIL III/Plus
Table of Contents
Error 31 - kV limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 34 - Tube current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 35 - Short circuit in the main inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 36 - Short circuit in the heating inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 37 - Regulation failure in the kV loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 38 Regulation failure in the mA loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 39 - Exposure timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 41 - The exposure has not finished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 42 - Heating current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 92 - RAM failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 93 - Failure in the initial verification of the + 15 V DC. . . . . . . . . . . . . . . . . . . .
Error 94 - Difference between doubler signal and voltage level. . . . . . . . . . . . . . . . .
Error 95 - Precharge Error. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 96 - Failure of Channel D (KV_NOM) in A/D converter . . . . . . . . . . . . . . . . . .
Error 97 - Failure of Channel B (JR_NOM) in A/D converter. . . . . . . . . . . . . . . . . . .
Error 98 - Failure of Channel C (Ih_NOM) in A/D converter . . . . . . . . . . . . . . . . . . .
32
33
33
34
34
34
35
35
35
35
35
36
36
36
36
36
POLYMOBIL Plus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
"Pause" error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 1 - Loss of the + 15 V dc. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 3 - Oil pressure rise or overheating of the tube . . . . . . . . . . . . . . . . . . . . . . . .
Error 4 - Static short circuit of the main inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 6 - IH heating measured < IH of preheating . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 7 - IH heating measured > IH allowed by software . . . . . . . . . . . . . . . . . . . . . .
Error 8 - kV measured < > 0 in idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 9 - mA measured < > 0 in idle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 11 - Voltage too high in the capacitor bank. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 12 - Noise in the static short circuit signal in the heating inverter. . . . . . . . . . .
Error 13 - Voltage in the capacitor bank is low during charge process . . . . . . . . . . .
Error 15 - Static short circuit, heating inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 22 - Short circuit, heating inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 23 - Tube current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 24 - The anode does not get up to its startup speed . . . . . . . . . . . . . . . . . . . .
Error 25 - Preparation timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 28 - Starter short circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 31 - kV limit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 34 - Tube current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 35 - Short circuit in the main inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 36 - Short circuit in the heating inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 37 - Regulation failure in the kV loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 38 Regulation failure in the mA loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 39 - Exposure timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 41 - The exposure has not finished . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 42 - Heating current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 92 - RAM failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error 93 - Failure in the initial verification of the + 15 V DC. . . . . . . . . . . . . . . . . . . .
Error 96 - Failure of Channel D (KV_NOM) in A/D converter . . . . . . . . . . . . . . . . . .
Error 97 - Failure of Channel B (JR_NOM) in A/D converter. . . . . . . . . . . . . . . . . . .
Error 98 - Failure of Channel C (Ih_NOM) in A/D converter . . . . . . . . . . . . . . . . . . .
37
37
37
37
38
38
38
39
39
39
40
40
41
41
42
42
42
43
43
44
44
45
45
45
45
46
46
46
46
46
47
47
POLYMOBIL III/Plus
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Siemens
Table of Contents
59
59
67
73
73
74
76
77
81
86
87
POLYMOBIL III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the maximum main inverter frequency . . . . . . . . . . . . . . . . . . . . . . . . . . .
Oscillating current measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the high-voltage kVNOM and kVACT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the filament and tube current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the maximum filament frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the tube current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the kV and tube current (IR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking the mAs values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Adjusting the mAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Coincidence of light and radiation fields . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
90
90
90
93
93
95
96
96
98
98
99
Siemens
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POLYMOBIL III/Plus
General
1-
1General
DANGER
WARNING
CAUTION
NOTICE
NOTICE used without the safety alert icon indicates a possible danger that if disregarded can or will lead to an undesirable outcome or state other than death, physical injury or
property damage.
NOTE
Warning about ionizing radiation or radioactive substances. Tests and adjustments that
must be performed with the radiation switched on are indicated by this radiation warning
icon.
POLYMOBIL III/Plus
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Siemens
General
1.1
WARNING
WARNING
X-ray radiation!
When working on the system where radiation has to be
released, comply with all radiation protection directives and
the rules for radiation protection according to
ARTD-002.731.02.
Non-compliance can lead to illnesses, irreversible
damage to body cells and to genetic make-up, severe
injuries, or death.
Use available radiation protection devices.
Wear radiation protection clothing (lead apron).
Maintain the greatest possible distance from the radiation source.
Release radiation only if necessary.
Set radiation activity as low as possible (low KV and
mAs values).
Siemens
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POLYMOBIL III/Plus
General
WARNING
POLYMOBIL III/Plus
SPR8-125.840.10.04.02
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CS SD SP/ CO
Siemens
General
Fig. 1:
D922_V92_V93
WARNING
Connect the POLYMOBIL Plus / III only to a line voltage supply (receptacle) that complies with the requirements of VDE 0107 or corresponds to the local national standards.
In general, switch off the system and disconnect the power cable from the mains prior to
any service work.
Remove or insert boards with the generator switched OFF only; observe ESD guidelines when handling boards.
Siemens
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POLYMOBIL III/Plus
10
General
All tools, measurement and auxiliary devices with the exception of those marked " * " are listed along with their specifications in the STC (Service Tools Catalog).
n/a
Digital multimeter
n/a
n/a
mAs meter
n/a
n/a
n/a
WARNING
1.2
POLYMOBIL III/Plus
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Siemens
General
11
Cleaning
1.3
The unit must always be switched off and disconnected from the mains before cleaning. Use only water to clean the unit or a lukewarm solution consisting of water and a
household cleaning agent.
Do not use abrasive cleaning agents or organic solvents such as benzene, alcohol, or
spot remover.
Siemens
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POLYMOBIL III/Plus
12
2Overview
Overview
2-
NOTICE
To check the assemblies, remove the upper covers, the handles, and the lower front cover of the switchbox.
Follow the Replacement Instructions,
SPR8-125.841.10...
POLYMOBIL III/Plus
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Siemens
Overview
13
POLYMOBIL III
2.1
D916
Function / Information
Value
V24
P1
P2
Not used
n/a
P3
P4
P5
SW2B
Operating modes:
Normal: Position 1
Normal / service
Service: Position 2
SW1
Do not use
SW3
Button
Operating modes:
= Service Mode
Activation/reset
Siemens
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POLYMOBIL III/Plus
14
Overview
D916.X15 Pin
Color
black
Ground (+ 5 V)
black
Ground (+ 5 V)
red
+5V5%
brown
+15 V 10%
blue
Ground (+/- 15 V)
yellow
-15 V 10%
LED D916:
V24
ON
Potentiometers D916:
P1
P3
P4
P5
Reset - switch
Fig. 2:
Left to
right
D916_test points
TP
Function/information
Measurement
GND
Mass measurement
n/a
GND
Mass measurement
n/a
KVN
Negative branch
1V
Range
POLYMOBIL III/Plus
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10 k V
Siemens
Overview
15
KVP
Positive branch
1V
10 k V
KV
Kv Ist in tube
1V
30 k V
JR
Tube current
1V
10 mA
1V
1 A (primary)
IH
Heating current
1V
1.2 A (secondary)
SWT
10
F1
11
TMP
12
VR
Reference voltage 5 V - dc
0.01
13
VC
1V
14
SCM
Error 35 and 4
15
SCH
16
JIM
Error 23 or Error 34
17
KVM
18
KVC
1V
19
VSA
Not used
n/a
20
KVS
1V
30 kV
21
JRS
1V
10 mA
22
IHS
1V
1.2 As
25
FC1
26
FC2
27
EXP
100 V
50 A
Low = Exposure
LED:
Siemens
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POLYMOBIL III/Plus
16
Overview
V86
V85
24 V presence
V15
Auxiliary voltage OK
V3
Collimator On
V93, V92
DC voltage BUS
Fuses:
F1
15 AT
F2
15 AT
F3
1 AT
Measurement points:
VP
0V
0V24
Ground 24V
P24V
+24V
HIP5
+5V
GNDA
Ground 5V
HIER
HID1
HID2
FAUX
HVD1
HVD2
HVRS
HVER
POLYMOBIL III/Plus
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Siemens
Overview
17
Fuse: 2 A T
Fuse: 5 A T
The display board shows the selected mAs and KV values. By pressing the membrane keyboard button, you can change the ON/OFF, KV, and mAs values.
The D1 measurement board of the high voltage main circuit represent KV and mA values
to the CPU.
The C1 capacitor is the capacitive portion of the main inverter. The C1 single tank belongs
to the high voltage circuit.
The pre-load and discharge resistors are responsible for the switch-on current and the discharge of the capacitor within 10 minutes after the system has been switched off, from
approximately 400VDC to a level below 10VDC.
LED
V85
24V presence
Siemens
LED
V86
ON
LED
V85
ON
24V presence
LED
V15
ON
Auxiliary voltage OK
LED
V93
ON
DC bus voltage
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POLYMOBIL III/Plus
18
POLYMOBIL III/Plus
Overview
LED
V92
ON
DC bus voltage
LED
V3
OFF
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Siemens
Overview
19
POLYMOBIL Plus
2.2
D916
Function / Information
Value
V24
P1
P2
Not used
n/a
P3
P4
P5
SW2B
Operating modes:
Normal: Position 1
Normal / service
Service: Position 2
SW1
Do not use
SW3
Button
Operating modes:
= Service Mode
Activation/reset
Siemens
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POLYMOBIL III/Plus
20
Overview
D916.X15 Pin
Color
black
Ground (+ 5 V)
black
Ground (+ 5 V)
red
+5V5%
brown
+15 V 10%
blue
Ground (+/- 15 V)
yellow
-15 V 10%
LED D916:
V24
ON
Potentiometers D916:
P1
P3
P4
P5
Reset - switch
TP
Function/information
Measurement
GND
Mass measurement
n/a
GND
Mass measurement
n/a
KVN
Negative branch
1V
10 k V
KVP
Positive branch
1V
10 k V
KV
Kv Ist in tube
1V
30 k V
JR
Tube current
1V
100 mA
1V
1 A (primary)
IH
Heating current
1V
1.2 A (secondary)
SWT
10
F1
Range
POLYMOBIL III/Plus
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Siemens
Overview
11
TMP
12
VR
Reference voltage 5 V - dc
0.01
13
VC
1V
14
SCM
Error 35 and 4
15
SCH
16
JIM
Error 23 or Error 34
17
KVM
18
KVC
1V
19
VSA
Not used
n/a
20
KVS
1V
30 kV
21
JRS
1V
100 mA
22
IHS
1V
1.2 As
23
I1
1V
4A
24
I2
1V
4A
25
FC1
26
FC2
27
EXP
28
Siemens
21
ERAR
100 V
50 A
disabled)
Low = Exposure
Starter signal
Error 28
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POLYMOBIL III/Plus
22
Overview
D927
Fig. 3:
D927_V40_V41
Name
Function / Information
Value
P1
V12
Presence of + 24 V DC
n/a
V5
Enables + 15 V DC
n/a
V40
Capacitor bank
n/a
Voltage indication
V41
Capacitor bank
n/a
Voltage indication
V46
n/a
are working
V59
Collimator on
n/a
Fuse
value
referring to
F3
1 AT (250 V / slow)
n/a
POLYMOBIL III/Plus
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Siemens
Overview
23
F5
6 AF (500 V DC / fast)
n/a
F6
20 AF (500 V DC / fast)
n/a
F7
15 AF (250 V / slow)
Line voltage
F8
15 AF (250 V / slow)
Line voltage
Fuse: 2 A T
Fuse: 5 A T
LED:
Vin (V8)
ON
Line voltage OK
VDC (V1)
ON
Capacitor voltage present (the voltage can also be considerably lower than 450 V)
V31
V30
V32
Fuse:
F1
15 AT
Charging circuit
(250 V / delayed)
Test points:
Siemens
ERR
VC
IC
FR1
GND
Ground
CAR
NCBC
OK
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24
Overview
LED:
Name
Function / Information
Value
V1 - 10
Fuse
value
referring to
F1-F10
20 A (500 V DC / fast)
F12
20 A (500 V DC / fast)
F11
The display board shows the selected mAs and KV values. By pressing the membrane keyboard button, you can change the ON/OFF, KV, and mAs values.
6.8 V 10 %
C2
C2 is the capacitor used to accelerate the rotor (phase shift); it is connected to the XCAP
connector.
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Siemens
Overview
25
Discharge resistors
Fig. 4:
R3_R4_R5
LED
D971:
all LEDs
D971:
Siemens
LED
Vin (V8)
ON
LED
ON
all LEDs
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ON
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POLYMOBIL III/Plus
26
Error Messages
3-
POLYMOBIL III
3Error Messages
Error 1
+ 15 V missing
System status:
Explanation:
Standby
Action:
System status:
Explanation:
Action:
Standby
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Siemens
Error Messages
27
System status:
Explanation:
Standby
Action:
System status:
Explanation:
Standby
Action:
Compare IH and IHS in D916 to make sure they are not the
same.
Siemens
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28
Error Messages
System status:
Explanation:
Standby
Action:
Error 8
System status:
Explanation:
Standby
Action:
Error 9
System status:
Explanation:
Standby
Action:
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Siemens
Error Messages
29
Error 11
System status:
Explanation:
Standby
Check the VC test point of the D916 and check the voltage
directly in the capacitor bank VC (possible point: HVVC in
D922).
Error 12 - Noise in the static short circuit signal in the heating inverter
Error 12
System status:
Explanation:
Standby
Action:
Check the SCH test point on the D916 (a high level means
a short circuit).
Check the cable connection between the D916 CPU and the
power board D922.
Siemens
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POLYMOBIL III/Plus
30
Error Messages
System status:
Explanation:
Standby
Action:
Check the cable connection between the CPU and the D922
(X20).
Check the VC test point of the D916, and check the voltage
directly in the capacitor bank VC (possible point: HVVC on
D922).
System status:
Explanation:
Standby
Action:
Check the SCH test point of the D916 (a high level means a
short circuit of the heating inverter).
POLYMOBIL III/Plus
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Siemens
Error Messages
31
Error 22
System status:
Explanation:
Preparation
Action:
Check the SCH test point of the D916 (a high level means a
short circuit of the heating inverter).
Short circuit outside the tube, look over the connections and
wiring that go to the tube.
Error 23
System status:
Explanation:
Preparation
Action:
Check the JIM test point of the D916 (a high level means a
tube current error).
Siemens
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POLYMOBIL III/Plus
32
Error Messages
Error 25
Preparation timeout
System status:
Explanation:
Preparation
This error occurs when preparation time (hand switch, first step)
exceeds 15 seconds without an exposure being taken.
Action:
Error 31 - kV limit
Error 31
kV limit
System status:
Explanation:
Exposure
Action:
Check the KVM test point of the D916 (a high level means
an error).
Check the signal cable connection between the tube and the
D916.
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Siemens
Error Messages
33
Error 34
System status:
Explanation:
Exposure
Action:
Check the JIM test point of the D916 (A high level means a
tube current error).
Error 35
System status:
Explanation:
Exposure
Action:
Siemens
Check C1.
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34
Error Messages
System status:
Explanation:
Exposure
Action:
Error 37
System status:
Exposure
System status:
Exposure
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Siemens
Error Messages
35
Error 39
Exposure timeout
System status:
Exposure
Error 41
System status:
Exposure
Error 42
System status:
Exposure
that the potentiometer P5 is not properly adjusted (the preparation current is too low).
Error 92
RAM/D916 failure.
System status:
Replace D916
Init
System status:
Init
Siemens
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36
Error Messages
System status:
Init
Error 95
Precharge Error
System status:
Init
System status:
System status:
Init
System status:
POLYMOBIL III/Plus
Init
Init
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Error Messages
37
POLYMOBIL Plus
3.1
"Pause" error
Pause
Message: "Pause"
System status:
Standby
+ 15 V missing
System status:
- Pin 1, 3: 0V
Standby
- Pin 4: 5V
- Pin 6: 0V
- Pin 7: -15V
System status:
Standby
Siemens
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38
Error Messages
System status:
Stand-by
System status:
Standby
TP - FC1.
System status:
Standby
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Siemens
Error Messages
39
Error 8
System status:
Check the cables, especially the ones between the tube and
the CPU (connector X8).
Some other possible causes may be: the CPU D916
and/or the D927 and/or the tube are defective.
Standby
Error 9
System status:
Check the cables, especially the ones between the tube and
the CPU (connector X8).
Standby
Error 11
System status:
Explanation:
Standby
Check the VC test point of the D916 and check the voltage
directly in the capacitor bank VC (possible points: between
the earth and fuse F5 located on D927).
Siemens
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POLYMOBIL III/Plus
40
Error Messages
Error 12 - Noise in the static short circuit signal in the heating inverter
Error 12
System status:
Check the SCH test point on the D916 (a high level means
a short circuit).
Standby
Check the cable connection between the D916 CPU and the
power board D927.
System status:
Explanation:
Standby
Action:
Check the Vc test point of the D916 and the voltage directly
in the capacitor bank (possible points: between the earth
and fuse F5 located on D927).
If VC and Vc are close to 440 V and 4.4 V, then D916
may be faulty.
If VC is close to 440 V but Vc is not at 4.4 V, then either
the D952 or the D916 may be bad.
If they are not close, then the D952 may be faulty.
POLYMOBIL III/Plus
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Siemens
Error Messages
41
Error 15
System status:
Check the SCH test point of the D916 (a high level means a
short circuit of the heating inverter).
Standby
Error 22
System status:
Check the SCH test point of the D916 (a high level means a
Preparation
short circuit).
Siemens
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POLYMOBIL III/Plus
42
Error Messages
Error 23
System status:
Check the JIM test point of the D916 (A high level causes
the error).
Preparation
System status:
Preparation
Error 25
Preparation timeout
System status:
Preparation
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Error Messages
43
Error 28
System status:
Preparation
Error 31 - kV limit
Error 31
kV limit
System status:
Check the KVM test point of the D916 (a high level means
Exposure
an error).
Siemens
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44
Error Messages
Error 34
System status:
Exposure
If an error exists in the entire range of kV during the exposure, especially at low kVs, a problem must exist inside the
tube.
Error 35
System status:
Exposure
POLYMOBIL III/Plus
Check C1.
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Error Messages
45
Error 36
System status:
Exposure
Error 37
System status:
Exposure
Error 38
System status:
Exposure
Error 39
Exposure timeout
System status:
Exposure
Siemens
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46
Error Messages
Error 41
System status:
Exposure
Error 42
System status:
Exposure
that the potentiometer P5 is not properly adjusted (the preparation current is too low).
Error 92
RAM failure.
System status:
Replace D916
Init
System status:
Init
System status:
Init
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Error Messages
47
Error 97
System status:
Init
System status:
Init
Siemens
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48
General
4Service programs
Service programs
40
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Service programs
49
POLYMOBIL III
4.1
Service programs
Siemens
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50
Service programs
Program 5 - Change of initial values (kV and mAs) or last value
Program 5
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Service programs
51
Siemens
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52
Service programs
Program 13 - eliminate the buzzers
Program 13
To save what you have selected, press the collimator light button.
Program 14 - adjustment of mAs V/F converter
Program 14
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Siemens
Service programs
Fig. 5:
Siemens
53
Program 15
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54
Service programs
POLYMOBIL Plus
4.2
Service programs
The voltage increases from 150 V to 440 V DC. The program remains
in each stage for approximately 6 minutes. The system stays at 440 V
DC (last stage) for approximately 1 hour, showing "CAP END".
POLYMOBIL III/Plus
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Siemens
Service programs
55
Siemens
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56
Service programs
Program 7 - Maximum main inverter frequency
Program 7
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Siemens
Service programs
57
To save what you have selected, press the collimator light button.
Program 14 - adjustment of mAs V/F converter
Program 14
Siemens
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58
Service programs
Program 15 - low consumption (reduced switch-on current), only if necessary
Program 15
Fig. 6:
POLYMOBIL III/Plus
Program 16
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Measurements
59
5-
POLYMOBIL Plus
High-voltage circuit
5Measurements
The purpose of the high voltage circuit is to reach the high voltage required in the shortest
possible period of time, and to keep it constant during the exposure. This voltage is used
to accelerate the electrons emitted by the filament. Impelled by that energy, these electrons
strike the anode, producing heat and x-rays in the resulting sudden deceleration.
The high-voltage circuit is controlled by a controller located on the D916 and it is directed
toward the D961 by means of a driver. The HV inverter consists of IGBTs (Isolated Gate
Bipolar Transistor). An H-Bridge diagonal inverter triggers the IGBTs, and the current
passes through the C1 capacitor and the high-voltage transformer located within the single
tank. The capacitor within stores energy that comes to it in pulses.
The high voltage is controlled by means of a microcontroller J36 (u167), when an exposure
is requested. The required value is converted by means of a D/A converter to an analog
value that can be measured at TP KVS. This analog value controls a PI (proportional - integral) regulator. The output of this amplifier is introduced into a VCO (Voltage Controlled
Oscillator) to generate a voltage depending upon the frequency. The maximum frequency
is 18 KHz. This signal is separated into opposite lines in order to handle the complete
bridge of the D961. For safety reasons, these signals are signals that can be interrupted.
The transformed voltage of the high transformer is connected by means of some current
limiters to the X-ray tube. In standby mode, there is no high voltage present - the inverter
is not active. During the exposure, the high voltage is present; it is monitored by the D916
CPU. The signals measured can be observed at TP KVN and KVP, corresponding to the
positive pulses and to the negative pulses. The sum of both is measured at TP KV (1V
30 KV). The KV signal is compared to the required KVS. The error of both is adjusted with
the PI.
ERR 8
ERR 31
kV limit
ERR 34
ERR 35
ERR 37
kV regulation failure
Siemens
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60
Measurements
To check control functions, use the following measurement points and representations.
Test point on the D916 ((Fig. 7 / p. 60)).
Fig. 7:
D916_TP
Fig. 8:
Exposure_kV_kVC_(1)
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Measurements
61
The TP KVC signal may vary due to different load conditions. The main inverter uses the
frequency changes to obtain the energy output. The system works as a serial resonant circuit. The closer the frequency of the converter to the resonance frequency, the greater the
transfer of energy will be.
Fig. 9:
Siemens
Exposure_kV_kVC_(2)
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62
Measurements
On the POLYMOBIL Plus, select 81 kV, 5 mAs.
Figure (Fig. 9 / p. 61) shows two channels of an oscilloscope at the KVC test point (resonance current of the main inverter) and at the kV test point (total kilovolts).
Channel 1 = TP KV 1V/div, Channel 2 TP KVC 2V/div, Trigger = Channel 2, level
2.48 V Time scale 100 s/div
Figure (Fig. 10 / p. 62) shows two channels of an oscilloscope at the KVC test point
(resonance current of the main inverter) and at the kV test point (total kilovolts).
Channel 1 = TP KV 1V/div, Channel 2 TP KVC 2V/div, Trigger = Channel 2, level
2.48 V Time scale 400 s/div
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Measurements
63
Siemens
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64
Measurements
On the POLYMOBIL Plus, select 121 kV, 5 mAs.
Figure (Fig. 11 / p. 63) shows two channels of an oscilloscope at the KVP test point
(positive branch of kV) on the D916 and at test point KVN (negative branch of kilovolts).
Channel 1 = TP KVN 2V/div, Channel 2 TP KVP 2V/div, Trigger = Channel 2, level
1.48 V Time scale 1 ms/div
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Measurements
65
On the POLYMOBIL Plus, select 125 kV, 2 mAs (when the tube is really cold).
Figure (Fig. 13 / p. 65) shows two channels of an oscilloscope at the KVP test point (positive branch of kV) on the D916 and at test point KVN (negative branch of kilovolts).
Channel 1 = TP KVN 2V/div, Channel 2 TP KVP 2V/div, Trigger = Channel 2, level 1.5
V Time scale 1 ms/div
If you do not obtain information from the above graphs:
Siemens
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66
Measurements
If this is not the case, adjust P4 to 18 kHz 0.5 kHz.
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Measurements
67
Figure (Fig. 15 / p. 67) shows two channels of an oscilloscope at the TP I test point (Resonance current) on the D916 and at the JR test point (X-ray current). We see that in
standby, there is no X-ray current present.
Channel 1 = TP JR 2V/div, Channel 2 TP I 2V/div, Trigger = Channel 2, level 5.4 V Time
scale 100 s/div
Maximum frequency of the current inverter
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68
Measurements
POLYMOBIL III/Plus
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Measurements
69
Siemens
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70
Measurements
Figure (Fig. 17 / p. 69) shows two channels of an oscilloscope at the TP 1 test point
(resonance current) on the D916 and at the JR test point (X-ray current).
We see that in standby, there is no X-ray current present.
Channel 1 = TP JR 2V/div, Channel 2 TP I 2V/div, Trigger = Channel 2, level 5.4 V
Time scale 100 s/div
During exposure, a real X-ray current is measured due to the existence of high voltage
between the anode and the cathode. This current is measured by means of a virtual
ground in the D900 and sent to the D916 CPU card. The corresponding signal can be
monitored at TP JR. The microcontroller switches between the heating regulation and
the tube current regulation.
During exposure
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Measurements
71
Figure (Fig. 18 / p. 70) shows two channels of an oscilloscope at the TP 1 test point
(resonance current) on the D916 and at the JR test point (X-ray current). We see that in
standby, there is no X-ray current present.
Channel 1 = TP JR 2V/div, Channel 2 TP I 2V/div, Trigger = Channel 2, level 1
VTime scale 200 s/div
At the end of the exposure, it returns to standby heating.
Due to the capacity limit of the capacitor bank, the system uses a decreasing load operational mode, by which the POLYMOBIL Plus takes advantage of the tube's curve.
Siemens
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72
Measurements
On the POLYMOBIL Plus, select 81 kV, 40 mAs.
Figure (Fig. 19 / p. 71) shows two channels of an oscilloscope at the JR test point
(X-ray current) and at the kV test point (total kilovolts).
Channel 2 = TP KV 2V/div, Channel 1 TP JR 2V/div, Trigger = Channel 1, level 1 V
Time scale 40 ms/div
During exposure
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Measurements
73
mAs counter
Please use the wiring diagram as you read the following information.
The tube current, measured on the D900 card, enters the frequency voltage converter J1
located on the D916 card. This converter generates a frequency that is proportional to the
voltage value, it being 1 V 64 kHz. The output pulses can be measured with an oscilloscope at the TP F1 of the D916 card. These pulses are digitally integrated in a counter until
the mAs's required are obtained. This count ends when a preselected value is reached.
The end of the exposure is controlled by a counter and a prescaler. When the exposure
ends, the system goes into standby. The only time that an exposure is interrupted ahead
of time is in the event that the system is operating incorrectly. Interruptions that last a long
time are automatically interrupted and an Err 39 error message appears.
Line voltage
The line voltage must be set to 110 V (+ 10%) or 230 V (+ 10%). The line voltage is adjusted
automatically.
Measuring KV and JR
Connect the oscilloscope to TP "JR" (i.e. Itube), "KV" (i.e. KVist) and "GND" on D916
CH1
TP "JR"
1.0 V/Div
CH2
TP "KV"
1.0 V/Div
Ground at "GND"
10 ms /Div
Trigger at CH1
Set 90 kV and 10 mAs at the POLYMOBIL Plus and release an exposure. The oscillogram should correspond to what is shown here: (Fig. 21 / p. 74).
Siemens
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74
Measurements
Charging frequency (TP FR1) and capacitor charging current (TP IC)
TP "FR1"
5.0 V/Div
CH2
TP "IC"
1 V/Div
Ground at "GND"
10 s/Div
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Measurements
75
WARNING
The charging time depends upon the residual charge of the capacitor bank and on the
available line voltage, e.g. with 230 V the maximum charging time is about 15 s. In the worst
case, (line voltage < 100 V and residual charge = 0 V), the charging time can be 40 seconds.
For the following measurement, the line voltage was 230 V and the residual charge 30 V
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76
Measurements
100 V)
Acceleration
(Fig. 24 / p. 77) shows the stator currents during rotating anode acceleration (230 V)
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Measurements
77
2.4V)
1.5 V)
4 ms /Div
NOTE
kV Control
It is generally not necessary to set the main inverter frequency in the field. When ordered as a replacement, D916 is
preset at the factory.
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78
Measurements
Measure FMAX in the service program Pr. 7 (See "Service program", section on "Service programs available")
Switch OFF POLYMOBIL Plus and wait until the capacitor voltage has dropped to a
value < 10 V.
Disconnect the cable from the inverter to capacitor C1. Push the cable through the current transformer 50 A: 50 mA (with a parallel resistor of 10 ohms) and reconnect the
cable.
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Measurements
NOTICE
79
Maximum main inverter frequency
The maximum main inverter frequency can only be
measured in the ascending part of the high voltage, i.e.
in the first microseconds, because afterwards the frequency is lower.
CH1: 1 V/Div,
20 s /Div
NOTE
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80
Measurements
kVact:
1V
20 KV
1V
30 KV
20 ms /Div
Error in the kVact acquisition
(Fig. 28 / p. 81) shows that one kVact cable from the single tank generator to the D916 is
damaged or disconnected. The monitor (KVM) responds (curve 3) because KVN and KVP
have different amplitudes; the exposure is terminated with ERR 12. Refer to function
description "KV monitoring".
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CH1:
Itube:
CH2:
CH3:
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Measurements
Filament current
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100 s/Div
NOTE
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Measurements
If this is not the case, adjust P5 on D916 until there is minimal current overshoot at the
beginning of the exposure.
The standby heating of the exposure is set via P5 (P5 clockwise: IH decreases / P5 counterclockwise: IH increases).
(Fig. 31 / p. 84) shows the correct setting.
In figure (Fig. 32 / p. 85) the standby heating is set too high.
In figure (Fig. 33 / p. 86) the standby heating is set too low.
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Measurements
CAUTION
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87
NOTE
Procedure:
Adjust the vertical SID of 100 cm or 40 to the top edge of the cassette using a measuring tape.
Measure the deviations (X1, X2, Y1, Y2) between the edges of the light field and the
radiation field on all four sides, corresponding to (Fig. 35 / p. 88).
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Measurements
Calculate the total deviations in the X and Y directions (disregarding the algebraic sign).
The deviations in length (total Y) as well as the deviations in width (total X) must be
smaller than 1.6 cm respectively.
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89
If the deviation is higher, loosen the 4 Allen screws slightly (arrows/Fig. 36 / p. 88) and
(arrows/Fig. 37 / p. 89) and move the collimator accordingly.
Then, tighten the screws on the collimator (arrows/Fig. 36 / p. 88) (torque Nom: 0.75
Nm, tolerance: 10%) and (arrows/Fig. 37 / p. 89) again.
Repeat the check and, if necessary, adjust the collimator again until the deviation
between the light field and the radiation field is within the admissible tolerance (< 1.6
cm).
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Measurements
POLYMOBIL III
5.1
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NOTICE
Integrated current transformer.
1V
X
50 A
POLYMOBIL III ON
Trigger exposure with default values 60 kV, 10 mAs.
Main inverter OK
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Measurements
After the kV rise
Error case
Only one diagonal is fired.
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POLYMOBIL III ON
Trigger an exposure with the default values 60 kV; 10 mAs.
Filament current
POLYMOBIL III ON
After approx. 7 seconds the standby filament current comes on.
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Measurements
Release an exposure with the default values 60 kV, 10 mAs.
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Measurements
Using P3, set the maximum filament frequency to D916 (100 kHz
10 s)
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POLYMOBIL III ON
X Release exposure with the default values 60 kV, 10 mAs.
NOTICE
The transient response of the tube current can be set
with P1 on D916.
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Measurements
Remove the 4 Allen screws (3 mm key size) from the lid of the single tank and take off
the lid ((Fig. 50 / p. 98)).
90 kV, 1 mAs
Remove the mAs meter and reinsert the jumper in the single tank at mA+ / mA - .
Reinstall the lid of the single tank.
Establish connection (jumper) from plug contact X2.6 (side of the board) to MP "GND"
on D916.
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NOTICE
Err 6 is displayed.
NOTE
Procedure:
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100
Measurements
Insert film into the 24 cm x 30 cm or 10 x 12 cassette and place it on a table or similar
surface.
Adjust the vertical SID of 100 cm or 40 to the top edge of the cassette using a measuring tape.
Measure the deviations (X1, X2, Y1, Y2) between the edges of the light field and the
radiation field on all four sides, corresponding to (Fig. 53 / p. 100).
Calculate the total deviations in the X and Y directions (disregarding the algebraic sign).
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The deviations in length (total Y) as well as the deviations in width (total X) must be
smaller than 1.6 cm respectively.
If the deviation is higher, loosen the 4 Allen screws slightly (arrows/Fig. 54 / p. 101) and
(arrows/Fig. 55 / p. 101) and move the collimator accordingly.
Then, tighten the screws on the collimator (torque Nom: 0.75 Nm, tolerance: 10%)
(arrows/Fig. 54 / p. 101) and (arrows/Fig. 55 / p. 101) again.
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Measurements
Repeat the check and, if necessary, adjust the collimator again until the deviation
between the light field and the radiation field is within the admissible tolerance (< 1.6
cm).
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103
6-
Chapter
Changes
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Siemens