Siemens 25 User manual

MULTIMOBIL 2.5
English
Print No.: SPR8-X01.840.01.01.02 Doc. Gen. Date: 09.05
Replaces: n.a.
© Siemens AG 2005
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use of this document or its contents
is not permitted without express
written authority. Offenders will be
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grant or registration of a utility
model _or_design,_are_reserved.
SP
Troubleshooting Guide

Service Manual
Service Instructions
Siemens Ltd. Med India Version 6.0
Copyright SIEMENS LTD. All rights reserved. For internal use only
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Multimobil 2.5
Med
Service Instructions
Version: 6.0
Copyright SIEMENS LTD.,MED INDIA
The reproduction, transmission or use of
this document or its contents is not
permitted without express written
authority. Offenders will be liable for
damages.

Service Manual
Service Instructions
Siemens Ltd. Med India Version 6.0
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INDEX
7SERVICE .........................................................................................................................7-3
7.1 TROUBLESHOOTING..........................................................................................................7-3
7.1.1 Tools and measuring instruments required...................................................................7-3
7.2 CONTROL VOLTAGES .......................................................................................................7-3
7.3 SIGNALS........................................................................................................................7-3
7.4 HT CHECK .....................................................................................................................7-4
7.5 CALIBRATION..................................................................................................................7-4
7.5.1 kVp Measurement.....................................................................................................7-4
7.5.2 mA / mAs Measurement ............................................................................................7-5
7.6 TROUBLESHOOTING..........................................................................................................7-5
7.6.1 Checking the line voltage...........................................................................................7-5
7.6.2 Checking the fuses ...................................................................................................7-6
7.6.3 Checking the LEDs on D920......................................................................................7-6
7.7 CHECKING THE CONTROL VOLTAGES....................................................................................7-7
7.7.1 Checking the Intermediate circuit voltage....................................................................7-7
7.8 CHECKING & SETTING THE MAXIMUM MAIN INVERTER FREQUENCY ................................................7-7
7.9 FILAMENT CURRENT MEASUREMENT ......................................................................................7-8
7.10 CHECKING THE HIGH VOLTAGE KVSOLL AND KVIST ..................................................................7-8
7.11 SETTING THE MAXIMUM FILAMENT FREQUENCY ........................................................................7-8
7.12 CHECKING THE TUBE CURRENT.............................................................................................7-8
7.13 CHECKING THE KV AND TUBE CURRENT (JR)...........................................................................7-9
7.14 CHECKING THE MAS VALUES...............................................................................................7-9
7.15 ADJUSTING THE MAS.........................................................................................................7-9
7.16 SWITCHING THE COLLIMATOR LIGHT ON................................................................................7-9
7.17 PROGRAM MODES FOR SERVICING.......................................................................................7-9
7.17.1 Program 1.......................................................................................................... 7-10
7.17.2 Program 2.......................................................................................................... 7-10
7.17.3 Program 3.......................................................................................................... 7-10
7.17.4 Program 4.......................................................................................................... 7-10
7.17.5 Program 5.......................................................................................................... 7-10
7.17.6 Program 6.......................................................................................................... 7-11
7.17.7 Program 7.......................................................................................................... 7-11
7.18 CODES...................................................................................................................... 7-12
7.19 SPECIFIC CODE HANDLING.............................................................................................. 7-13
7.19.1 Unit not turning ON.............................................................................................. 7-13
7.19.2 No Radiography................................................................................................... 7-15
7.19.3 No Standby........................................................................................................ 7-17
7.19.4 Initialisation CODEs............................................................................................ 7-18
7.19.5 Standby CODEs ................................................................................................. 7-20
7.19.6 EXPOSURE CODES........................................................................................... 7-27
7.20 PCB LAYOUT DRAWINGS ............................................................................................... 7-36
7.20.1 Master Card D915 ............................................................................................... 7-36
7.20.2 Interface PCB D920 ............................................................................................ 7-37
7.20.3 Inverter Card D61................................................................................................ 7-38

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7Service
7.1 Troubleshooting
7.1.1 Tools and measuring instruments required
•Usual service tools
•Digital multimeter
•2 channel storage oscilloscope with 2 probes and 1 current probe
•mAs meter
•Protective ground wire and leakage current tester: Bender safety tester
•Radiation detector
During Oscilloscope operation the protective ground wire connection in the
power cable must not be interrupted under any circumstances.
For measurements where ground loops that may be present could impair the
measuring result, use the Tek amplifier and the trigger attachment .
7.2 Control Voltages
Voltage Measuring Point Range
+5 V D915.X15.4 4.8V to 5.2V
+15 V D915.X15.5 13.5V to 16.5V
-15 V D915.X15.7 -13.5V to –16.5V
+24 V(For Filament) D920 X4.7 &4.8 23 V to 25.5 V
Collimator Supply D920.X12A/B 12V ac to 16V ac
7.3 Signals
Signal Measuring Point Range Adjustment
Kvsoll D915.TP.KVS
During Exposure 2.0 ±0.1 V for 60kV D915.P7
Masoll D915.TP.JRS
During Standby 2 V ±0.1 V for 60kV D915.P6
CAUTION

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Signal Measuring Point Range Adjustment
IH D915.TP. IH
During Standby 2 V ±0.1 V D915.P5
During Preparation 3.8 V ±0.3 V (For critically
damped mA)
Fmax D915.TP.REG point
during exposure 9.2 kHz ±0.3 kHz D915.P4
7.4 HT Check
7.5 Calibration
It is advisable to re-calibrate the unit in case of undershoot or overshoot observed in
the mA waveshape.
Recalibration is required when the single tank is replaced.
7.5.1 kVp Measurement
The kVp measurement can be carried out either by kVp-meter or by electrical
measurement.
7.5.1.1 kVp-meter
Switch the unit ON.
Insert the kV sensor into collimator channel and connect the cable to the meter.
Open collimator flaps such that the sensor is well covered by the field.
Set the kVp meter at 12pulse and 55-85kV range.
Set exposure parameters as 60kV 20mAs.
Release an exposure. The radiation LED will light up during exposure.
The meter will read 57-63kV.
Repeat with meter setting 77-150kV and exposure parameter setting as 90kV 20mAs.
The meter will read 85.5-94.5 kV.
7.5.1.2 Electrical
Connect oscilloscope at D915.TP.KV.
Set the exposure parameters as 60KV 2.5mAs.
Release an exposure.
The recorded waveform will read 2.85 - 3.15V.
Repeat with 90kV 1.6mAs.
The recorded waveform will read 4.27 - 4.75V.
Lower kV indicates error in kVsoll / kVsensing / kV-regulator OR high mA.
WARNING Use Radiation Protection.
Presence of High Tension.

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Higher kV indicates error in kVsoll / kV sensing / kV regulator.
7.5.2 mA / mAs Measurement
mAs measurement could be carried out either by mAs-meter or by electrical
measurement.
7.5.2.1 mAs-meter
Remove mAs link on D920.
Insert mAs-meter leads in the banana sockets mA+ and mA- on D920.
Set meter in the mAs mode at 200mAs.
Set exposure parameters as 60kV 20mAs.
Release an exposure.
The meter will read 19 - 21mAs.
Repeat for exposure parameters 90kV 16mAs.
The meter will read 14.4 to 17.6mAs.
The actual tube current can be measured by setting the meter in mA mode.
Set the exposure parameters as 60kV 50mAs.
Release an exposure.
During the exposure, the meter will read 23 - 27mA.
7.5.2.2 Electrical
Connect oscilloscope at D915.TP.JR.
Set exposure parameters as 60kV 2.5mAs.
Release an exposure.
The recorded waveform will read 1.58 - 1.62V.
The exposure time will be 76 - 84mS.
Lower mA indicates error in mAsoll / mAsensing / mA regulator circuit.
Higher mA indicates error in mAsoll / mA sensing / mA regulator OR Low kV.
Incorrect mAs indicates Error in timer.
7.6 Troubleshooting
In case of CODEs which Impair radiography, perform the following checks.
7.6.1 Checking the line voltage
Measure the supply voltage at site using the digital multimeter.
Ensure that the supply conditions
•Voltage
•Frequency
•Mains Resistance
are within limits as specified in the Technical Specifications for the Unit.
Switch the Unit ON

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Switch the Unit OFF.
7.6.2 Checking the fuses
Open the front cover of the control unit .
Loosen the Fuse carriers which are mounted on the base of the control unit and check
the continuity of fuse link . If fuse link has responded for overcurrent replace the Fuse
Link.
Checking the fuses on D920
F1 0.25 AT T1 transformer primary
F2 0.630 AT 240 V for X-ray table.
F3 0.630 AT 24 V for K3,K4,K5 relays
F4 10 AF Collimator supply
F5 4 AT Filament circuit.
7.6.3 Checking the LEDs on D920
Switch the Unit ON.
After the initialisation, the default data 60 kV and 10 mAs are displayed at first time
switch ON or last stored kV & mAs value.
7.6.3.1 Standby mode
On D920 the following LEDs are illuminated :
V3 Main line voltage 240 V.
V9 Presence of 240V.
V12 Presence of 24 V for relay
V15 Presence of 12 V for collimator
V25 Presence of 24V for filament circuit
7.6.3.2 Preparation ON
On half press of exposure release switch unit should go in preperation mode.
In addition, V22 (green) lights up on D915.
7.6.3.3 Exposure Mode
On the second step of exposure release switch ,unit enters in radiograpy mode.
In addition, V23 (green) for exposure lights up on D915.
7.6.3.4 CODE message
NOTICE If the Unit can not be switched ON Check Supply at
Socket.Check Continuity of mains cable with the Plug
pins.Check Over Current Protective devices MCB and U1 & U2.

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V24 (red) lights up on D915 and CODE no. will be displayed on 7 segment display.
This will alternate with the kV and mAs values selected.
7.7 Checking the Control Voltages
When the unit is ON relay K2 on D920 are ON.
SMPS placed in the Inverter module gets supply, Measure the DC voltages at X15
connector of D915 PCB.
Pin No. Signal Name Input/Output max. permissible
voltage/current
1D gnd Input 0V
2-nc- -nc- -
3D gnd Input 0V
4DC supply Input + 5V
5DC supply Input +15V
6A gnd Input 0V
7DC supply Input -15V
-nc- = No Connection
7.7.1 Checking the Intermediate circuit voltage
Depending on the supply voltage, a value between 250 to 350Vdc must be measured
with the digital multimeter across the parallel capacitors C1,C2,C6,C7 and C9(if
present) in inverter module.
7.8 Checking & setting the maximum main inverter frequency
Turn the Unit OFF.
Place the ST link on D915 so as to short the two terminals.
Make the unit ON. The unit enters SERVICE mode.
In the service mode of the unit ,select Prog 7 by using the KV switches.
On activation of this mode by pressing the DL-serv Key, the display indicates
Adj F
Press the Radiographic exposure switch and monitor REG on Digital storage
Oscilloscope at Reg Test Points.
The display indicates
FOn
And max. Inverter firng frequency will be displayed on Oscilloscope.
Adjust REG for 9.2 kHz ±0.3kHz by using P4 on D915 card
After adjusting the frequency switch off the unit and remove ST link on D915 card .

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Fmax= 9.2 ±0.3 kHz.
Adjust the maximum main inverter frequency with potentiometer P4 on D915
Turn the Unit OFF.
Connect 9 pin D-type connetor on D920 PCB.
7.9 Filament current measurement
Turn the Unit OFF.
Connect oscilloscope to D915.TP.IH
Turn the Unit ON.
After approx. 3 seconds the Stand-by filament current starts & equal to 2V±0.2V
Trigger exposure with default values for kV and mAs.
Observe the change in voltage level from 2 V±0.2V to Preheat value approx
3.8V ±0.3 V.
Note : Preheat value is parameter (kV & mAs) specific. Just observe the change in
level on preheating step.
7.10 Checking the high voltage kVsoll and kVist
Connect oscilloscope to D915.TP.KVS & D915.TP.KV
Turn the unit ON.
Trigger an exposure with the default values.
Observe the voltage on C.R.O with the scale corresponding to 1V= 20kV for KV
and 1V =30KV for 30 KVS.
7.11 Setting the Maximum filament frequency
Turn the Unit OFF.
Remove X11 D915.
Connect oscilloscope to D915.TP.CAL
Turn the unit ON
``
Wait for the contactor to pick up.Press the DL_serv key on the D936 twice.
Using P3, set the maximum filament frequency on D915 (1.8 KHz to 2.2 KHz))
Note : Duty Cycle of the waveform is varying as the ON time is fixed.
Turn of the Unit.Replace X11 connector on D915 PCB.
7.12 Checking the tube current
Connect oscilloscope to D915.TP.JRS & D915.TP.JR
Turn the unit ON.
Trigger an exposure with the default values.
Observe the voltage on CRO (1V = 20mA) & confirm value for selected kV & mAs.

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7.13 Checking the kV and tube current (JR)
Connect oscilloscope to D915.TP.KV & D915.TP.JR
Turn the unit ON.
Trigger an exposure with the default values.
Observe the voltage on CRO (1V = 20mA & 1V=20kV) for selected kV & mAs .
7.14 Checking the mAs values
Turn the Unit OFF.
Remove the Shorting Link “mAs +/-” on D920 PCB banana sockets.
Connect mAs meter to “mAs +/ mAs-” on D920 PCB.
Turn the Unit ON.
Trigger the following exposures:
Setting at control panel Valid mAs values
40kV,200 mAs 190..210 mAs
66kV,100mAs 95...105 mAs
90kV,1mAs 0.9.....1.1mAs
Turn the Unit OFF.
Remove the mAs meter and reinsert the Link on the D920 PCB.
7.15 Adjusting the mAs
Turn the Unit OFF.
Remove the Shorting Link “mAs +/-” on D920 PCB banana sockets.
Connect mAs meter to “mAs +/ mAs-” on D920 PCB.
Turn the unit ON.
Trigger the exposures for default kv & mAs settings.
Observe the mAs meter reading and if it is not within the tolerance (specified in the
Technical Specifications) of set value adjust the P1 on D915 card
7.16 Switching the Collimator Light ON
Switch ON Collimator Lamp. The Halogen lamp will light up and field of light will appear
on the target. The lamp will be switched OFF automatically after 30 seconds.
If the collimator lamp is switched ON and OFF several times within a short
period, overload protection will automatically switch the light OFF. Cool-down periods
are recommended.
7.17 Program Modes for servicing.
To put the Unit into service Mode short the ST link on the D915 and turn ON the unit
.The display will show as follows
P r
1

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Use the KV + or KV – switch to move to any program (PR1 to PR7)
Use the DL_Servswitch on the D936 to to select the displayed program.
7.17.1 Program 1
Not Used
1. Short the ST link on the D915 and put the unit on .
the display will read as below and enter program mode .
Pr 1
2. This program is not used
7.17.2 Program 2
To check the total number of exposures taken .
1.The display on the D932 will be as below.
XXX XXX
XXX XXX corresponds to the total number of exposures taken on the unit.
7.17.3 Program 3
To check the type of codes that occurred in the unit (maximum 20) .
1.Press the switch DL-serv on the D936 once.The display will be
AA XX
AA diplays the serial number of the exposures that have occured, in chronological
order (max. 20) & XX displays the corresponding codes occured on the unit
7.17.4 Program 4
To erase the codes that occurred in the unit
1.Press the switch DL-serv on the D936 once.The display will be
ErA Err
Keep the mAS– key depressed for 4 seconds till the dislay beomes
0Err
7.17.5 Program 5
To store the Last Value of KV & mAS Display

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LAS VAL
By entering into this program the last value displayed before turning OFF the Unit will
be displayed on turn it On the next time.
7.17.6 Program 6
To Display the maimum KV & mAS possible with the Unit
100 200
100 indicates the maximum KV available & 200 indicates the maximum mAS
available on the Unit
*In case the display values do not varyin standby by using the key PCB then
Enter this program and vary the KV & mAs displayed using the Key PCB D936
Then switch the the Unit OFF and enter standby mode,the unit should function
normally .
7.17.7 Program 7
Adjusting REG frequency.
Please refer chapter 7.8(Checking & setting the maximum main inverter frequency)

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7.18 CODEs
Initialisation Codes
90 EPROM Checksum
Failure The EPROM Checksum is stored at 7FFEh and 7FFFh as a 16 bit word. During self Diagnostics the software calculates the checksum of the EPROM
and compares with the stored checksum.
96 kVsoll Failure During Self Diagnostics the software outputs 7Fh to the D/A converter (B).
The 2.5V at the output of the D/A converter is Read by the µC through Analog
Port 4. The value read should be greater than 7Ah and less than 86h. (I.e.
between 2.39V and 2.62V)
97 JRS Failure During Self Diagnostics the software outputs 7Fh to the D/A converter (A).
The 2.5V at the output of the D/A converter is Read by the µC through Analog
Port 3. The value read should be greater than 7Ah and less than 86h. (I.e.
between 2.39V and 2.62V)
99 Last Reset by watchdog
Timer The built-in Watchdog timer (WDT) is reset by the software every 25 msec. If due to some failure the software doesn’t reset the WDT, the WDT in turn will
reset the µC after 65 msec.
Standby CODEs
02 +15VSupply error The +15V supply from SMPS is polled by the µC through Analog port 0. The
+15V supply should be between +12V to +18V.
03 Iheiz < Istby The Filament Standby current is 2A. Iheiz read by the µC through Analog port
2 should be greater than 1.75A. i.e. 1.75V (Iheiz ratio : 1V = 1A)
04 Iheiz > Istby The maximum value of Standby current permitted is 2.2 A.
05 kVist <> 0 kVist is read by the µC through Analog port 7. During Standby the value of
kVist read should be Zero. (kVist ratio : 1 V = 20kV)
06 JR <> 0 JR is read by the µC through Analog port 1. During Standby the value of JR
read should be Zero. (JR ratio : 1 V = 20mA)
33 Main Inverter Short Circuit In standby mode if the Main Inverter Driver (Cable) is disconnected this
CODE gets activated.
Exposure CODEs
11 Main Inverter Short Circuit This CODE is displayed when short circuit is detected by the drivers of the
Main Inverter.
12 kVist > kVmax The PkV is monitored for Max.110kV. If the actual value of kV is greater than
this i.e. if the voltage cross 3.73V CODE is displayed.
13 Iheiz > Imax OR JR >
Jrmax Maximum value of Iheiz above whichCODE will be displayed is 4.4 A (4.4V). Maximum value of mAist above whichCODE is displayed is 71mA. (3.59V)
14 kVist < kVsoll kVist is continuously polled during exposure. The value of kVist should be
greater than 85% of kVsoll
15 JR < JRS JR is continuously polled during exposure. The value of JR should be
greater than 50% of JRS.
17 Backup Timer This CODE is displayed if regular means of terminating exposure fails and
exposure gets terminated by the backup timer. Exposure time is set for (Exp
+ Exp/4) for less than 100 ms and (Exp +Exp/10) for greater than 100 ms
18 Premature Exposure
Termination Exposure Release Switch is released before the exposure is terminated by the mAs Integrator.

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21 I > Iheiz This CODE is displayed if the filament current exceeds 4.1V in prepation
state.
22 Maximum Preparation
Time This CODE is displayed if First step is pressed for more than 15 sec.
7.19 Specific CODE Handling
7.19.1Unit not turning ON

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7.19.2 No Radiography

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7.19.3 No Standby

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7.19.4Initialisation CODEs
CODE 90 (EPROM CHECKSUM FAILURE)
CODE 96 (KV SOLL FAILURE)
CODE 97 ( mA FAILURE)
CODE 99 (LAST RESET BY WATCH DOG TIMER)

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