Siemens MULTIMOBIL 10 Troubleshooting Guide

MULTIMOBIL 10

Troubleshooting Guide

SP

© Siemens AG 2003

The reproduction, transmission or
use of this document or its contents
is not permitted without express
written authority. Offenders will be
liable for damages. All rights,
including rights created by patent
grant or registration of a utility
model _or_ design,_are_ reserved.

English
Print No.: SPR8-X01.840.10.02.02 Doc. Gen. Date: 10.05

Replaces: SPR8-X01.840.10.01.02

Multimobil 10

Service Manual

Service Instructions

Med

Service Instructions

Version: 4.0

The reproduction, transmission or use

of this document or its contents is not
permitted without express written
authority. Offenders will be liable for
damages.

Siemens Ltd. Med Division India Version 4.0

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Service Manual

Service Instructions

INDEX

1 SERVICE................................................................................................................................................... 4

1.1 SAFETY PRECAUTIONS : .......................................................................................................................... 4

1.2 TROUBLESHOOTING : .............................................................................................................................. 4

1.2.1 Tools and measuring instruments required....................................................................................... 4

1.3 MEASURING WITH OSCILLOSCOPE : ......................................................................................................... 4

1.4 HANDLING PRECAUTIONS........................................................................................................................ 4

1.5 CONTROL VOLTAGES .............................................................................................................................. 5

1.6 SIGNALS & LINE VOLTAGE DISPLAY: ...................................................................................................... 5

1.7 HT CHECK : ............................................................................................................................................ 6

1.8 EXPOSURE :............................................................................................................................................. 6

1.9 TIMING :.................................................................................................................................................. 6

1.10 KVP,KVN &KV MEASUREMENT :.......................................................................................................... 6

1.10.1 kVp-meter :................................................................................................................................... 6

1.10.2 Electrical :.................................................................................................................................... 7

1.11 MA/MAS MEASUREMENT :...................................................................................................................... 7

1.11.1 mAs-meter : .................................................................................................................................. 7

1.11.2 Electrical :.................................................................................................................................... 7

1.12 CALIBRATION :........................................................................................................................................ 7

1.13 FORMING :............................................................................................................................................... 8

1.14 SAFETY NOTES AND PROTECTIVE MEASURES .......................................................................................... 8

1.15 REPLACING DAMAGED OR MISSING SCREWS ............................................................................................ 8

1.16 CLEANING............................................................................................................................................... 8

1.17 CLEANING THE UNIT............................................................................................................................... 8

1.18 DISINFECTING ......................................................................................................................................... 9

1.19 MAINTENANCE........................................................................................................................................ 9

1.20 PRODUCT DISPOSAL................................................................................................................................9

1.21 SAFETY CHECKS ................................................................................................................................... 10

1.21.1 Daily checks................................................................................................................................ 10

1.21.2 Monthly checks ........................................................................................................................... 10

1.21.3 Performance Check (Every Six months) ..................................................................................... 10

1.22 PROGRAM MODES FOR SERVICING........................................................................................................ 11

1.22.1 Program 1 : To display the DC voltage on the capacitor........................................................... 11

1.22.2 Program 2 : To check the total number of exposures taken . .................................................... 11

1.22.3 Program 3 : To check the type of codes that occurred in the unit maximum 20 ....................... 11

1.22.4 Program 4 : To Erase the errors that have occurred on the unit. .............................................. 12

1.22.5 Program 5 : To set the display value at switch ON to Default Kv mAs combination or last

selected Kv mAs combination. ....................................................................................................................... 12

1.22.6 Program 6 : To set the maximum kV and mAs value for the unit. .............................................. 12

1.22.7 Program 7 : To set the max.inverter firing frequency(REG)...................................................... 12

2 CODES..................................................................................................................................................... 14

3

TROUBLESHOOTING ......................................................................................................................... 16

3.1 REMOVING THE TOP PANEL, FRONT COVER AND X-RAY SOURCE ASSEMBLY ......................................... 16

3.1.1 Removing the top panel ................................................................................................................... 16

3.1.2 Removing the Front cover. .............................................................................................................. 17

3.1.3 Removing the X-ray source assembly..............................................................................................17

3.2 CHECKING THE LINE VOLTAGE, FUSES AND LEDS................................................................................. 18

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3.2.1 Checking the line voltage ................................................................................................................ 18

3.2.2 Checking the fuses........................................................................................................................... 19

3.2.3 Checking the LEDs on D801 ........................................................................................................... 19

3.3 CHECKING THE CONTROL VOLTAGES ................................................................................................... 19

3.4 CHECKING THE INTERMEDIATE CIRCUIT VOLTAGE................................................................................ 20

3.5 CHECKING THE MAXIMUM MAIN INVERTER FREQUENCY ...................................................................... 20

3.6 FILAMENT CURRENT MEASUREMENT .................................................................................................... 20

3.7 CHECKING THE HIGH VOLTAGE KVSOLL AND KVIST............................................................................. 20

3.8 SETTING THE MAXIMUM FILAMENT FREQUENCY .................................................................................. 21

3.9 CHECKING THE TUBE CURRENT ............................................................................................................. 21

3.10 CHECKING THE KV AND TUBE CURRENT (JR)........................................................................................ 21

3.11 CHECKING THE MAS VALUES ................................................................................................................ 21

3.12 ADJUSTING THE MAS ............................................................................................................................ 22

3.13 SWITCHING THE COLLIMATOR LIGHT ON............................................................................................. 22

3.14 ALIGNING THE LIGHT FIELD TO THE RADIATION FIELD .......................................................................... 22

3.14.1 Operating sequence .................................................................................................................... 22

3.14.2 Evaluation: ................................................................................................................................. 22

3.15 CHECKING AND READJUSTING THE COUNTERWEIGHT ........................................................................... 23

3.16 ADJUSTMENT INSTRUCTIONS : .............................................................................................................. 23

3.17 REPLACING THE SINGLE TANK............................................................................................................... 23

3.18 REPLACING THE COLLIMATOR............................................................................................................... 24

3.19 REPLACING THE COLLIMATOR LAMP .................................................................................................... 24

Service Instructions

4 SPECIFIC CODE HANDLING ............................................................................................................ 25

4.1 UNIT NOT SWITCHING ON ..................................................................................................................... 25

4.2 NO RADIOGRAPHY ................................................................................................................................27

4.3 NO STANDBY ........................................................................................................................................ 29

4.4 INITIALISATION CODES.......................................................................................................................... 30

4.4.1 Code 90 (EPROM CHECKSUM FAILURE)................................................................................... 30

4.4.2 Code 96 (KV SOLL FAILURE) ......................................................................................................30

4.4.3 Code 97 ( mA FAILURE) ................................................................................................................ 30

4.5 STANDBY CODES .................................................................................................................................. 31

4.5.1 Code 02 : +15 V Supply Code......................................................................................................... 31

4.5.2 Code 03 & 04 : Iheiz < Istby & Iheiz > Istby.................................................................................. 32

4.5.3 Code 05 : kVist <> 0....................................................................................................................... 33

4.5.4 Code 06 : JR <> 0........................................................................................................................... 34

4.5.5 Code 33 : Main Inverter Short Circuit............................................................................................ 35

4.6 EXPOSURE CODES ...........................................................................................................................36

4.6.1 Code 11 : Main Inverter Short Circuit............................................................................................ 36

4.6.2 Code 12 : kVist > kVmax................................................................................................................. 37

4.6.3 Code 13 : Iheiz > Imax OR JR > Jrmax......................................................................................... 38

4.6.4 Code 14 : kVist < kVsoll.................................................................................................................. 39

4.6.5 Code 15 : JR < JRS......................................................................................................................... 40

4.6.6 Code 17 : Exposure terminated by Backup Timer........................................................................... 41

4.6.7 Code 18 : Premature termination of Exposure................................................................................ 42

4.6.8 Code 21 : Iheiz > Iheiz maximum.................................................................................................... 43

4.6.9 Code 22 : Maximum Preparation Time........................................................................................... 44

4.6.10 Code 10 : Rotating Anode not OK.............................................................................................. 45

4.6.11 Code 31 : No charging ............................................................................................................... 46

4.6.12 Code 01 : Err signal on D950A active ....................................................................................... 48

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Service Manual

Service Instructions

1 Service

1.1 Safety Precautions :

Before working on the unit ensure that the Mains is switched OFF.
For completely safe working remove mains plug.

The unit must be OFF before removing or putting back the assemblies.

The protective earthing of subassemblies must not be removed in any case.

1.2 Troubleshooting :

1.2.1 Tools and measuring instruments required

• Usual service tools

• Digital Multimeter:

• 2 channel storage oscilloscope with 2 probes and one 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.

1.3 Measuring with oscilloscope :

For normal working, the protective earthing of mains must not be removed.
In case system noise is getting coupled to the scope, use the scope in differential
mode.
To measure high voltage, use DIFFERENTIAL probe isolated from ground.

1.4 Handling precautions

Strictly observe ESD precautions while handling PCBs and ESD sensitive
devices.

After the unit is switched ON, the capacitors C1~C12 on D970A and D971
charge to 355V DC. After switching the unit OFF, it takes about 08 minutes for
capacitors to discharge. The presence of DC voltage is indicated by Green
LED V24 on D950A and also V1 ~ V12 LED’s on D970A / D971.

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Service Instructions

1.5 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

Collimator Supply D801 . X6 12V ac to 16V ac

1.6 Signals & Line voltage display:

Signal Measuring Point Range Adjustment

kVsoll D915.TP.KVS

2.0 ± 0.1 V for 60kV

D915.P7

during Exposure

mAsoll D915.TP.JRS

3.2 V ± 0.1 V for 160mA

D915.P6

during Exposure

D915.TP. IH during

1.5V± 0.1V

Standby

IH

REG: Max

Main Inv. req.

CAL :Max

Fil.Inv. Freq

D915.TP. IH during
Preparation

D915.TP.REG point
during exposure

D915 TP CAL during
start up

2V ±0.3V (for critically
damped mA)

15 kHz ± 0.5 kHz

15KHz ± 0.5 kHz

D915.P5

D915.P4

D915 .P3

The actual mains Line voltage, at 110 and 230 V supply, is being monitored for
display on the 7 segment display during first step of hand release switch for
radiography. Ensure that display value mathes with actual line voltage with allowed
tolerance ± 5 %. Using P1 potetiometer on D801 PCB, set the voltage accordingly.

This is applicalbe while replacing D915 and D801 PCB also.

If the Line voltage is less than 205 volts on on 230 V line, microcontroller switches
“ON“ the ’LN’ contactor which will support extra voltage through auto transformer
for rotating anode to run at higher speed. In preperation and exposure mode
contactor retains its position. After 5 second of each termination of radiography Line
voltage is being monitored once again.

When unit is connected to 110 V line LN contactor does not function even though
there is a variation in the supply voltage.

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Service Instructions

1.7 HT Check :

Presence of High Tension

Observe Safety Precautions.

Use radiation protection

1.8 Exposure :

Switch the generator ON.
Set exposure parameters as 60Kv, 16 mAs.
Pull the recoilable exposure release switch and release an exposure.
The yellow LED on top panel lights up for a short duration equal to exposure time.
Audible indication by a Buzzer from the control and muffled sound from inverter
confirms the working of the inverter.
The LED’s on D915 light in the following sequence:
S27 - STEP 1(half press) : V22
Exposure state : V23
In case of code : V24
Code corresponding to the code is displayed on the seven-segment display.
Sharps knocking sound from inverter indicates inverter short circuit, resulting in
code display on the top panel.

1.9 Timing :

Set 60 kV 16mAs
Release an exposure. The radiation indication LED will light for 100msec ± 5msec.

1.10 KVp,KVn &KV Measurement :

The kVp, KVn & KV measurement can be carried out either by kVp-meter or by
electrical measurement.

1.10.1 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 ranges.
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.

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Service Instructions

1.10.2 Electrical :

Connect oscilloscope at D915.TP.kV.
Set the exposure parameters as 60kV 16mAs.
Release an exposure.
The recorded waveform will read 2.9V - 3.1V.
Repeat with 100kV 10mAs.
The recorded waveform will read 5V +/-0.25V.

Lower kV indicates code in kVsoll / kV sensing / kV-regulator OR high mA.
Higher kV indicates code in kVsoll / kV sensing / kV regulator.

1.11 mA/mAs Measurement :

mAs measurement could be carried out either by mAs-meter or by electrical
measurement.

1.11.1 mAs-meter :

Remove mAs link on D800 PCB on the Single tank.
Insert mAs-meter leads in the banana sockets mA+ and mA- on D800.
Set meter at, 200mAs and in the mAs mode.
Set exposure parameters as 60kV 32mAs.
Release an exposure.
The meter will read 31 – 33 mAs.
Repeat for exposure parameters 100kV 40mAs.
The meter will read 39 to 41mAs.

1.11.2 Electrical :

Connect oscilloscope at D915.TP.JR.
Set exposure parameters 60kV 16mAs.
Release an exposure.
The recorded waveform will read 3 – 3. 2V.
The exposure time will be 95 - 105mS.

Lower mA indicates code in mAsoll / mA sensing / mA regulator circuit.
Higher mA indicates code in mAsoll / mA sensing / mA regulator or Low kV.
Incorrect mAs indicate code in timer circuitry.

1.12 Calibration :

It is advisable to re-calibrate the unit in case of undershoot or overshoot observed in
the mA wave shape.
Recalibration is required when the single tank is replaced.

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Service Instructions

1.13 Forming :

If the unit is being installed after six months from the date of despatch, the
capacitors C1~C12 on D970A/D971 need forming. Refer Installation
instructions for forming procedure.

1.14 Safety notes and protective measures

Refer to the General safety note in Chapter on Installation.

Before working on the open MULTIMOBIL 10, switch off the unit with the power
switch at the control panel, the MCB in off position and remove the Mains cable
from socket.
Before inserting or removing PC boards, switch off the generator and observe the
ESD regulations.

1.15 Replacing damaged or missing screws

Damaged or missing screws should only be replaced by steel screws having the
specified tensile strength with Nickel Plating (6492) specified in the Surface Finish
Documents.

1.16 Cleaning

The unit must always be switched OFF or disconnected before cleaning.
Use only water or a Luke warm mixture of a household cleaner diluted with water to
clean the unit.
Do not use an abrasive or organic solvents or cleaning agents containing solvents
such as gasoline used for cleaning purposes, alcohol or stain remover. Do not spray
water on the unit.

1.17 Cleaning the Unit

Switch OFF the system prior to cleaning, disinfecting or sterilizing.

Clean the stand with a damp cloth or cotton pad.
Dampen the cloth or pad with water or lukewarm, diluted commercially available
liquid cleaning solution.

Note:
Do not use scouring powder; organic solvents (may damage materials) or
solvent based cleaning fluids (benzene, alcohol, spot remove).

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Service Instructions

Do not spray any fluid on the unit. The cleaning fluid must not seep into the
generator.

1.18 Disinfecting

As is commonly known, the ingredients in disinfectants are hazardous to your
health. Ensure that the room is well ventilated when using any disinfectant. Follow
manufacturer’s instructions for the use of the product.

To disinfect surfaces, we recommend common liquid solutions of aldehyde-based or
ampholytic surfactant -based disinfectant.

Substituted phenol based or chlorine-releasing disinfectant can weaken
materials and are not recommended. The same restrictions apply to undiluted solutions
with a high alcohol content (e.g. for disinfecting hands). Disinfectant sprays should
generally not be used, the spray can seep into the system, and safety features can no
longer be guaranteed (possible damage to electrical components, formation off
flammable mixtures of air and the solution vapor.

1.19 Maintenance

All parts, modules of this product must be tested, inspected, for performance and
safety aspects every 12 months to ensure that the product functions properly and is
safe for patients, operating personnel and other persons.
Every 12 months, trained technical personnel should inspect and if necessary
replace system components of the generator, which may produce hazardous,
conditions due to excessive wear and tear. These instructions should be included in
the annual maintenance performed by Siemens Customer Service.

If more frequent inspections and maintenance are required by federal or local
regulations, ensure compliance with them.

1.20 Product Disposal

Legal regulations may contain special prescriptions concerning the disposal of this
product. In order to avoid environmental damage and/or personal injury, please
inform SIEMENS Customer Service if you want to put the unit out of operation and
dispose it.
Radioprotection Material
Lead in X-ray tube assembly and in Collimator 3 kg.

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Service Instructions

Transformer Oil

Oil in X-ray tube assembly, approx. 7 kg.

Plastics

Epoxy resin on PC boards, PVC of cables approx. 10 kg.

Electrolytic Capacitors

These capacitors must be emptied. Please inform the Siemens Customer Service.
Capacitors approx. 15 kg
Remaining Electrolytic Capacitors approx. 0.5 kg.

1.21 Safety Checks

The user shall follow the following safety checks:

1.21.1 Daily checks

Check the power cord. Do not use the unit if the power cord is damaged.

Check the exposure indicator and audible signal during exposure.

Check that the Single tank assembly and the arm system remain in the desired
position.

1.21.2 Monthly checks

Check the lifting and lowering movements of the support arm.

Check function of locking lever and cap screw on the X-ray tube

Check the legibility of the labels according to those in section Location of Labels.
If any labels require to be replaced, please notify Siemens customer service.

1.21.3 Performance Check (Every Six months)

Check counterbalancing of the support arm at each position.

Check the locking mechanism for the support arm.

Check brake for proper functioning .

Take a sample exposure at 60 kV, 16 mAs.

Check for Radiation indication LED and the Audio indication in form of Buzzer.

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Service Instructions

Note : Annual Maintenance must be performed as per the guidelines described in

the Maintenance section.
Notify Siemens Customer Service if you do not have a maintenance contract.

1.22 Program Modes for servicing.

To put the unit into service mode, Short the ST link on the D915 and put ON the
unit.Use the Kv+ and Kv- switches to select the required program from 1 to 7.

To check the parameters in the program,press the DL-serv switch once.

1.22.1 Program 1 : To display the DC voltage on the capacitor.

Select the program one in service mode and the display will read as below

Pr 1

Press the switch DL-serv on the D936 once.

The display will read as below

Cap XXX

XXX corresponds to the DC voltage on the capacitors.

1.22.2 Program 2 : To check the total number of exposures taken .

Select the program two in service mode and the display will read as below

Pr 2

Press the DL-serv switch and enter into the program.The display will be

XXX XXX

XXX corresponds to the total number of exposures taken on the unit.

1.22.3 Program 3 : To check the type of codes that occurred in the unit
maximum 20 .

Select the program three in service mode and the display will read as below

Pr 3

Press the switch DL-serv on the D936 once.The display will read as below.

AA XX

AA displays the serial no of the errors occurred in chronological order.
XX corresponds to the type of code.

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Service Instructions

Press the kV+ switch to check all the codes stored. Maximum 20 codes can be
stored.

1.22.4 Program 4 : To Erase the errors that have occurred on the unit.

Select the program four in service mode and the display will read as below

Pr 4

Press the switch DL-serv on the D936 once.The display will read as below.

Era Err

To erase the errors keep the mAs + switch pressed till the display reads

0 Err

1.22.5 Program 5 : To set the display value at switch ON to Default Kv mAs
combination or last selected Kv mAs combination.

Select the program five in service mode and the display will read as below

Pr 5

Press the switch DL-serv on the D936 once.The display will read as below.

las Val

The default value can be set by selecting the desired kV, mAs combination.
Last selected combination can be stored by pressing the DL-serv switch twice.

1.22.6 Program 6 : To set the maximum kV and mAs value for the unit.

Select the program six in service mode and the display will read as below

Pr 6

Press the switch DL-serv on the D936 once.The display will read as below.

125 100

Set the required limit for kV and mAs using the kV /mAs increment and decrement
switches.

1.22.7 Program 7 : To set the max.inverter firing frequency(REG).

Select the program seven in service mode and the display will read as below

Pr 7

On activation of this program by pressing the DL-serv switch , the display indicates

Adj F

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Service Instructions

Press the Radiographic exposure switch and monitor REG on Digital storage
Oscilloscope.

The display indicates

F On

Adjust REG for 15 kHz ±0.5kHz by using P4 on D915 card.

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Service Instructions

2 Codes

Initialisation Codes

90

EPROM Checksum Failure

96

KVsoll Failure

97

JRS Failure

99 Last Reset by Watchdog

Timer

02

+15V Supply Code

03

Iheiz < Istby

04

Iheiz > Istby The maximum value of Standby current permitted is 3.3 A.

05

KVist <> 0

06

JR <> 0

33

Main Inverter Short Circuit

34

Filament Inverter Short Circuit

07

Rot ≠ 0

08

Braking Failure

01

Err signal on D950A active

31

No Charging

10

No Rotation of Rotating Anode

11

Main Inverter Short Circuit

12

KVist > kVmax

13

Iheiz > Imax OR JR > JRmax

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.

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)

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)

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

The +15V supply from SMPS is polled by the µC through Analog port 0. The
+15V supply should be between +12V to +18V.

The Filament Standby current is 3A. Iheiz read by the µC through Analog port
2 should be greater than 2.75A. i.e. 1.35V (Iheiz ratio : 1V = 2A)

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)

JR is read by the µC through Analog port 1. During Standby the value of JR
read should be Zero. (JR ratio : 1 V = 50mA)

If the Main Inverter Driver (Cable) is disconnected this Code gets activated.
Also if IGBT Drivers on D960 Card detects Short Circuit of IGBT’s this Code
gets activated.

This Code gets activated if IGBT Drivers on D801 Card detects Short Circuit
of Filament Inverter IGBT’s

The current flowing through both the windings of motor is monitored
separately. During standby Rotor should be off.RT1, RT2=0.

After exposure is terminated the Unit returns to Standby state and braking of
Rotor is started by allowing a DC current to flow through the KI2.During this
state which is for 8 sec after exp, RT1=0 and RT2=1.

Temperature on the heat sink of D950A exceeds it’s limit or Voltage exceeds
365v across capacitors C1~C12 or IGBT V24 on D950A is short circuit.

Voltage on capacitors C1~ C12 does not increase within 3.5sec of CS picking
up or it is less than 335 V DC

Exposure Codes

Anode Rotation in the Single Tank is not taking place. This Code is displayed
if any one of the RT1and Rt2 signal goes low during preparation.

This Code is displayed, when the drivers of the Main Inverter detect short
circuit.

The PkV and NKV is monitored for Max.68kV separately. If the actual value of
kV is greater than this i.e. if the voltages at J12.8 and J12.10 on D915 cross

4.5V, Code is displayed.

Maximum value of Iheiz above which Code will be displayed is 7 A (3.5V).

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