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Description

SOMATOM Definition CT

Troubleshooting Guide Gantry Instructions for Troubleshooting

© Siemens,

07740777

© Siemens,

Any document in electronic form may be printed once

Copy and distribution of electronic documents and hardcopies is prohibited

Offenders will be liable for damages

All other rights are reserved

Print No

02 C2-028

English Doc

Date: 08

Copyright / Version / Disclaimer

1Copyright / Version / Disclaimer

Copyright “© Siemens,

- Germany,

Siemens Shenzhen Magnetic Resonance Ltd

- China,

Siemens Shanghai Medical Equipment Ltd

- China,

Siemens Medical Solutions USA Inc

Document Version Siemens reserves the right to change its products and services at any time

In addition,

manuals are subject to change without notice

The hardcopy documents correspond to the version at the time of system delivery and/or printout

Versions to hardcopy documentation are not automatically distributed

Please contact your local Siemens office to order current version or refer to our website http://www

Disclaimer Siemens provides this documentation “as is“ without the assumption of any liability under any theory of law

The service of equipment described herein is to be performed by qualified personnel who are employed by Siemens or one of its affiliates or who are otherwise authorized by Siemens or one of its affiliates to provide such services

Assemblers and other persons who are not employed by or otherwise directly affiliated with or authorized by Siemens or one of its affiliates are not entitled to use this documentation without prior written authority

SOMATOM Definition

Page 2 of 176 H CX CS SD CR-CT

© Siemens,

Table of Contents

0Table of Contents

Definitions and abbreviations

Prerequisites

Overview

Problem isolation

Generator oscillator procedure (GenOSC)

Flowchart for HV Troubleshooting

XDC/Tube

TSG high voltage

Check/adjust the tube oil pressure

HV plugs with arcing tracks

HV plug installation at HV sockets

High voltage tests

Filament

36 Arcing

© Siemens,

Page 3 of 176 H CX CS SD CR-CT

SOMATOM Definition

Table of Contents Safety

Definitions and abbreviations

Prerequisites

TSG Image Quality

General

TSG strong rings

TSG sporadic strong rings

TSG weak rings

TSG sporadic weak rings

TSG rings in outer slices only

TSG Streak artifacts

TSG Dual Source problems

TSG Spatial Resolution (bad MTF results)

TSG other artifacts

Tests for Image Quality

TSG DMS Components

Storage of Test Results

Environmental Conditions

Hints for defective channel detection

Separate between module and other components

How to interpret the physicist’s line

Definitions and abbreviations

General: Receivers with Revision IRS Receiver/s

TSG data quality at Tx module

TSG data quality at RX modules

TSG sporadic errors in link DCON

Step 1 (checking)

Step 2 (debugging)

Step 3 (localizing)

Tests for data transmission

How to check the transmitting antenna

Measuring the fiber optic signal along the link

Check the electrical RF signals at the Rx modules

Check the quality of data signal (jitter) at the G-REC input

SOMATOM Definition

Page 4 of 176 H CX CS SD CR-CT

© Siemens,

Table of Contents

Definitions and abbreviations

General: Receivers with Revision UMAR

TSG for connection UMAR

-> UMAS

TSG data quality at Tx modules

TSG data quality at Rx modules

Tests for data transmission

Definitions and abbreviations

Prerequisites

CAN Bus

149 DOM

Definitions and abbreviations

Prerequisites

CANopen Bus

Prerequisites

Master stationary (MAS) test

Gantry panel control (GPC) test

Rotation control (ROT) test (only max

© Siemens,

Page 5 of 176 H CX CS SD CR-CT

SOMATOM Definition

Table of Contents

SOMATOM Definition

Page 6 of 176 H CX CS SD CR-CT

© Siemens,

General

Safety information

1General

Only qualified and system-trained service staff is allowed to perform CT system installation,

maintenance and quality assurance

Ensure that the most recent version of the service documentation is available

To avoid any risk of injury to persons and/or damage to the system read and observe the General Safety Notes (TD00-000

Please read and observe the Productspecific safety notes (C2-028

xx) which include very important safety-related information as well as information about handling of screws and nuts,

use of Loctite and instructions for torque wrenches

You will find the following information in the “Product-specific safety notes

• Safety information related to the method of risk management (C2-028

• General safety information such as the handling of service documentation,

CT system training request,

X-ray protection,

(C2-028

• General safety information about working in the gantry with the power off/on (C2-028

• Use of the patient table as lifting device for gantry part replacement (C2-028

• Attachment of screws and nuts,

adjustment instructions for the torque wrench (C2-028

Safety warnings

The following safety information is an extract of the information in the Product-specific safety notes (C2-028

It is mandatory to read and observe the safety information described below

CAUTION

Flammable sprays

Risk of inflammation

! ¹ Only use approved and recommended cleaning agents as described

CAUTION

Handling parts of the system that may have come into contact with patients may lead to infection caused by blood-borne pathogens

Infection caused by blood-borne pathogens

! ¹ Take appropriate precautions against exposure to blood-borne pathogens (e

© Siemens,

Page 7 of 176 H CX CS SD CR-CT

SOMATOM Definition

General WARNING

High voltages and/or mechanical movements (e

gantry rotation) may lead to accidents and injuries when opening system covers

Risk of accident and injury

! ¹ Only authorized service personnel is allowed to open system covers

CAUTION

Not following X-rays protective regulations may lead to radiation exposure to you and/or other persons

Risk of radiation exposure

! Observe radiation protection regulations when X-rays are switched on,

: ¹ Never work inside the gantry room

¹ Do not leave the system unattended

¹ Make sure there isn't anyone inside the gantry room

¹ Make sure that no person can enter the gantry room unnoticed (e

WARNING

Dangerous voltages are present when the system is switched on

Dangerous voltages may be present even when the system is switched off due to capacity power

Risk of electric shock

! ¹ Observe power-off instructions and discharge wait times (allow at least five minutes discharge time after the last scan for all involved HV and UDC/UPS parts)

¹ Secure the system against unintended switch-on (e

block breaker and/or mark breaker against switch on)

¹ Ensure via measurements that all voltages are switched off

¹ Connect the stationary and rotating parts of the gantry to a protective conductor prior to working in the gantry

CAUTION

Rotating parts are exposed when gantry covers are opened

Risk of injury

! ¹ Maintain a safe distance and ensure that objects do not come in contact with rotating parts

SOMATOM Definition

Page 8 of 176 H CX CS SD CR-CT

© Siemens,

General

9 CAUTION

Unfixed parts/cables during gantry rotation

Risk of accident and injury

! ¹ Make sure that all parts and cables are mounted properly before starting rotation

CAUTION

Temperature of tube and/or tube cooling device parts may be above 70C (with Straton up to 130C)

Risk of burns

! ¹ Avoid contact with oil and exposed parts of X-ray tube and cooling device

¹ Wait until tube and cooling device parts are chilled down

© Siemens,

Page 9 of 176 H CX CS SD CR-CT

SOMATOM Definition

General

Information for switching off the gantry power

• Switch off system (Click and select in the user main menu to switch off the system automatically after shut down)

Additionally,

switch off the gantry power using service pushbutton S1 in PDC-A (C2-028

Secure against unintended switch-on

SOMATOM Definition

Read and observe the safety information in the “Product-specific safety notes” prior to performing service work in the gantry

If the gantry power is switched off for service work,

always secure it against accidental switch on

Page 10 of 176 H CX CS SD CR-CT

© Siemens,

General

Service Push-Button S1 in PDC-A

Service push-button S1

Service push-button S1

Push-button

If S1 is pressed the complete power supply for the gantry is switched off

As well as the power input to the DC-Link of XGS_A and XGS_B

The circuit breakers F2,

F11 in PDC_A and F2 in PDC_B get tripped through an additional shunt trip attached to the circuit breakers

For normal operation the circuit breakers have to be reset manually

© Siemens,

Page 11 of 176 H CX CS SD CR-CT

SOMATOM Definition

General

Safety bolts

Rotation safety lock

Rotation safety lock

• Unlock position of gantry front safety bolt (item 1) • Lock position of gantry safety bolt (item 2)

Rotation safety lock

• Back rotation safety bolt (item 1) located between XGS A and HV-tank A at the back of the gantry

• Lift bolt and turn it 90 degrees to bring it into the lock or unlock position

¹ Make sure that the bolt is really at the correct (lock/unlock) position

If the bolt accidentlally moves into the lock position during rotation,

SOMATOM Definition

Page 12 of 176 H CX CS SD CR-CT

© Siemens,

General

• Principle function of back safety bolt

Back safety block

Back safety block

• Unlock position of gantry front safety bolt (left image,

From lock position (item 2),

lift the bolt in the direction of the arrow and rotate it 90 degrees to bring the bolt into the unlock position (item 1)

• Lock position of gantry safety bolt (right image,

From unlock position (item 1),

lift the safety bolt and rotate it 90 degrees to bring it into the lock position (item 2)

© Siemens,

Page 13 of 176 H CX CS SD CR-CT

SOMATOM Definition

General

Data ring protection

• Installing data ring protection

Data ring protection

• Install the 2 data ring protectors (e

item 1) before working at the gantry front

SOMATOM Definition

Page 14 of 176 H CX CS SD CR-CT

© Siemens,

XRS General

WARNING

Avoid accident and injury or damage to parts

Risk of accident and injury

! ¹ Read and observe the safety information contained in the “General” section of this document and/or the “Product specific safety notes”

This section contains information on isolating XRS problems

• • Section “High voltage”

Section ”Filament”

Section ”Anode rotation”

Section ”XRS hints”

Section ”Measuring point”

Definitions and abbreviations Tab

Definitions and abbreviations

Definition / Abbreviation

X-ray deflection control

X-ray generator,

X-ray generator,

X-ray system

X-ray tube

X-ray tube assembly

X-ray tube cooling

Middle voltage transmission

© Siemens,

Page 15 of 176 H CX CS SD CR-CT

SOMATOM Definition

XRS Term

Definition / Abbreviation

High voltage tank

Troubleshooting guide

Prerequisites

Documents n

a Tools and auxiliary equipment

• Standard tool kit • HV test plugs

SOMATOM Definition

Page 16 of 176 H CX CS SD CR-CT

© Siemens,

Overview

The XRS section contains information on possible XRS tests and the corresponding troubleshooting guides

In the SOMATOM Definition,

troubleshooting always starts by calling up the EventLog and searching for the relevant error message

Follow the instructions given in this error message for troubleshooting

In some cases,

the error message will link you to troubleshooting instructions as described in this document

This link is normally used if the troubleshooting instructions are too complex or images are needed for troubleshooting

Additionally,

read the information which is stored in the tube history (Local Service

->Report)

This information can always be useful in case of XRS problems

Problem isolation

Principle problem isolation in case of XRS problems 1

Find relevant error message in Eventlog NOTE

The XGR and XGS assemblies are continuously communicating using the CAN bus after the system is switched on

For this reason,

Always check both (XGS/XGR) error messages when troubleshooting

Follow the instructions given in the error message text for troubleshooting ¹ The information provided in the error message will guide you in finding the problem

In some cases,

you will be linked to this Test and Troubleshooting instructions,

In this case,

follow the relevant troubleshooting instructions described in this document

Generator oscillator procedure (GenOSC)

Generator oscillator adaptation (Gen-Osc) is an automatic program

The purpose of the program is to adapt the inverter frequencies

The program performs very short scans with different inverter frequencies to find the minimum resonance point

This value is stored to D700 in XGS

The frequency adaptation procedure must run successfully

XRS errors such as UT too high or UT max errors (e

g XRS_83 error) may abort scanning

The same errors may appear if parts of the oscillating circuit (MV cable,

XGS_PDC_Control,

HVT / MVT) have been replaced without performing GenOSC after exchange

For this reason,

always use the relevant guided tour after part replacement

© Siemens,

If GenOsc fails because of arcing,

test plugs for HVT) and perform GenOsc again with dummy plugs installed

Page 17 of 176 H CX CS SD CR-CT

SOMATOM Definition

Flowchart for HV Troubleshooting

The flowchart (Fig

For more information regarding this tool,

see the documentation for CT016/09/R

SOMATOM Definition

Page 18 of 176 H CX CS SD CR-CT

© Siemens,

© Siemens,

Page 19 of 176 H CX CS SD CR-CT

HV Troubleshooting Flowchart SOMATOM Definition

XDC/Tube

XDC/Tube Test

INIT Tests: During INIT,

all XRT drivers of the XDC (outputs on X13 and X14) are tested in 2 steps

The first step is an isolation check for detecting short circuits between the output wires and ground or power (230 V)

This step can detect defective driver gates within the XDC as well

The second step activates the drivers and can detect short circuits between the output wires or broken wires

The INIT tests have failed if any warning or error message occurs in the Eventlog during step 1 or 2,

or if the requested currents in step 2 cannot be reached

XDC/Tube Self-Test within Service SW: The XDC/Tube self-test is basically the same as the INIT test

Depending on the actual system state,

the XDC/Tube self-test tolerates some problems

if the XDC/Tube self-test fails,

switch the gantry off/on to initialize an INIT test

Test results: If the test fails,

it results in error message " CT_DCA/B 31" where the parameters give some information on which part of the test failed

In addition to this information,

there can be additional errors or warnings which indicate the error

Follow the instructions in the warning/error message for troubleshooting Usage of the tests: The XDC/Tube self-test can help detect problems in the output drivers of the XDC,

The test can be helpful if the XDC has aborted scans with the error message "CT_DCA/B 51

especially if parameter 3 is 0x00,

Be aware that any of these errors can happen during arcing as well,

without any real HW problem within the XDC or the tube

If the INIT tests fail,

you have a problem in the XDC,

If any additional error or warning message occurs in the Eventlog during INIT,

it can be used to help detect where the problem is located

You can disconnect the cable on the XDC (X13 and X14) and/or the tube (X8 and X4) and then repeat the INIT test

When the additional errors/warnings disappear,

you have disconnected the faulty part from the XDC

Remark: Test can be used if the system is in or is not in stand-by status

XDC/Tube test

XDC/Tube test Performing the filament test 1

Select Local Service > Test Tools > Tube/Generator 2

Select XDC/Tube

Click GO and follow the instructions in the dialog

The test is terminated automatically

SOMATOM Definition

Page 20 of 176 H CX CS SD CR-CT

© Siemens,

High voltage

TSG high voltage

The following high voltage TSG has to be used in case of high voltage problems

The TSG starts at the XRT (X-ray tube) and provides guidance through the HV related components

XRS components cannot be exchanged from system A to system B or vice versa for troubleshooting

Always use new silicon insulators at the HV sockets ((HV plug installation at HV sockets / p

High voltage TSG

• Check Eventlog for UT max and /or UT too high errors (e

g XRS_83) or arcing problem (XRS_68)

• If there are UTmax and /or UT too high errors,

-> Tune Up

-> GenOSC)

a) if GenOSC is aborted due to a problem

c) if the HV problem is solved

No further action necessary

• If there is any doubt that the oil pressure is correct,

Too low oil pressure especially in the “older”1

• Perform GenOSC with installed test plugs

See (HVC plug test / p

• Perform Gettering (Local Service

-> Tune Up

-> Getter)

a) if the HV problem is not solved after gettering the tube

© Siemens,

Page 21 of 176 H CX CS SD CR-CT

SOMATOM Definition

XRS Step 4

Action 1

Switch off system (select System

Switch off rotation enable switch S301

Remove HV plugs from the HV sockets (beside the tube)

Remove insulators from the HV plugs

Check HV plugs and the 2 insulators for signs of arcing (black dots or stripes) (HV plugs with arcing tracks / p

a) If there are any signs of arcing

• If there are any signs of arcing on the plugs,

HV sockets,

a) Clean HV plugs and the 2 sockets (inside) with alcohol

b) If any signs of arcing (cracks) remain on the plug or HV sockets

c) If there are no signs of arcing remaining on the parts

Follow the dialog of the HVC tube test (tube test with HV but without load)

a) If there are no XRS HV error messages found in the logbook

b) If there are XRS HV error messages found in the logbook

• Perform HV plug test with installed dummy plugs ( #10 093 700) at HV sockets (HVC plug test / p

Follow the dialog of the HVC plug test

(HV plug installation at HV sockets / p

there is no HV problem on generator side

b) If there are still XRS HV error messages found in the logbook

SOMATOM Definition

Page 22 of 176 H CX CS SD CR-CT

© Siemens,

23 Step 8

Action 1

Switch off system (select System

Switch off rotation enable switch S301

Remove HV plugs from the HVT (high voltage tank)

Check HV plugs and the 2 silicon disks for signs of arcing (black dots or stripes) (HV plugs with arcing tracks / p

a) If there are any signs of arcing

• If there are any signs of arcing on the plugs or the disks

a) Clean HV plugs and HVT sockets inside with alcohol b) If any signs of arcing (e

cracks) remain on the HV cable plugs or HVT sockets

c) If there are no signs of arcing remaining on the parts

• Perform HVC plug test scans with installed dummy plugs (#1621791) at HVT (HVC plug test / p

Follow the dialog of the HVC plug test

a) If there are no XRS error messages found in the logbook (UMAR errors are acceptable)

b) If there are XRS error messages found in the logbook

• The HV problem is related to tube load

Possible reasons: Inverter problem,

a) Check Eventlog for XRS errors related to inverters

b) Check ground connections (bad contact

Check/adjust the tube oil pressure

An incorrect oil pressure can result in various errors

If the oil pressure is too high,

the tube would activate the oil pressure safety switch or the oil temperature safety switch,

The more likely case,

is that the oil pressure is too low

Especially in the Somatom Definition (dual source),

the earlier type of tubes needs to be adjusted to 1

05 bar,

current tubes need a pressure of 1

© Siemens,

Page 23 of 176 H CX CS SD CR-CT

SOMATOM Definition

XRS NOTE

From 11/2009 on,

new tubes need a pressure of 1

These tubes are clearly labelled,

and also the expansion unit is labelled with a red sticker

Set the pressure on “old” tubes without label to 1

05 bar,

The expansion vessel for the following measurement can be ordered from service stock

The part number for the vessel is: 10569439

Cool down the system for at least 10 minutes cooling time after the last scan

During the cooling time,

the system must be switched on

¹ Be aware that some system components may be very hot,

may reach up to 130 degrees Celsius

• Wait until the tube and the cooling system have cooled down,

then switch the system to COMP/ON status at the control box

Switch off the gantry power using service push button S1 in PDC A

Remove the gantry lower front ring segment

Turn the gantry by hand until the Straton MX P tube (A or B) is in the 6 o‘clock position

Secure against unintended rotation by using the front safety bolt

Prepare the expansion vessel

Adjusting unit for expansion membrane

• Install the adjustment handle (item 1) on the expansion vessel

• Open the quick coupling and disconnect the lower oil hose at the tube

Connect the oil hose from the expansion vessel to the empty quick coupling of the tube

SOMATOM Definition

Page 24 of 176 H CX CS SD CR-CT

© Siemens,

25 NOTE

The pressure indicator at the expansion vessel shows the actual pressure in the oil circuit after the oil hose from expansion vessel has been connected

• Check/adjust the oil pressure

• Check the pressure at the pressure indicator (item 2) attached to the expansion vessel using the expansion handle (item 1)

The correct pressure for tubes without a label is 1

See following table for altitude correction of pressure

Newer tubes are clearly labelled with a sticker that requests a pressure of 1

See following table for altitude correction of pressure

• If the system is located at a higher altitude than sea level > add the following correction factor to the sea level pressure (see following table) ¹ For example,

Potosi (Bolivia) is located at an altitude of 4000m

If an “older” 1

the correct pressure would be 1

05bar + 0

39bar = 1

the same tube would be adjusted to 1

Likewise,

the correction factor has to be considered

Altitude [m]

Difference [bar]

© Siemens,

Page 25 of 176 H CX CS SD CR-CT

SOMATOM Definition

XRS Altitude [m]

Difference [bar]

• If the pressure is not correct,

adjust the membrane position using the adjustment handle (item 1)

• After the pressure adjustment is finished,

remove the expansion vessel (remove the oil quick-snap connection to the XRT)

• Attach the second oil hose from the XTC again to the tube

Unlock the safety bolt for gantry rotation

Rotate the gantry by hand and check for unusual noise

Close all covers opened before

Switch on circuit breakers F2,

and F11 in the PDC A and F2 in the PDC B

¹ First switch the F2,

F6 circuit breakers to the “0” position and then to the “1” position

• Switch the system to the SYSTEM/ON status at the control box

HV plugs with arcing tracks

HV plugs and insulators with arcing tracks

SOMATOM Definition

Page 26 of 176 H CX CS SD CR-CT

© Siemens,

© Siemens,

Page 27 of 176 H CX CS SD CR-CT

SOMATOM Definition

HV plug installation at HV sockets

Prepare the high voltage connectors and test plugs

• Check to ensure the connector is clean and inspect it for damage

• Apply oil (supplied with the part) to the entire plug surface (left figure,

¹ Use about half of the oil from the tube for both plugs

• Put oil into the new silicon insulator (item 2)

• Install the silicon insulator part over the plugs (left figure,

item 1) ¹ Ensure there is no air left in the silicon insulator

SOMATOM Definition

Page 28 of 176 H CX CS SD CR-CT

© Siemens,

Prepare the high voltage connectors

• Check that there is no air left in the silicon insulator

• Insert the O-ring onto the HV plug (item 1)

• Put oil onto the silicon insulator (item 2)

• Insert the high voltage plugs into the receptacles

¹ Verify the position of the plugs (+ or

• Install the O-ring into the HV socket as shown (right figure,

• Hand-tighten the fastening rings

Tighten the HV plugs

• Tighten the HV plugs using the special tightening tool (delivered with the system) with a torque of 25 Nm

High voltage tests

Description of available HV tests

© Siemens,

Page 29 of 176 H CX CS SD CR-CT

SOMATOM Definition

XRS HVC tube test For high tension arcing or HV breakdown,

the test utility HVC tube test is available in the “Tube/Generator” test tools platform

The HVC tube test lets you apply high tension to the HV circuit without tube current

No test plugs are used in this test

No radiation is released during the test procedures

This test should always be performed before an HVC plug test is started

If this test does not indicate an error,

the HVC plug test will not indicate an error either

This may lead to wrong part replacements

Prerequisites Test needs system in standby status

Performing the HVC tube test 1

Select Local Service

Select Ttube A or B

Click “Go” on the virtual user panel

Follow the instructions in the dialog

Click the Start button at the control box

The test runs for 80 seconds

The test is terminated automatically with an error message from UMAR (scan time exceeded)

If test fails perform the HVC plug test described next to select which XRS part is defective

HVC plug test For high tension arcing or HV breakdown,

the primary test utility HVC plug test is available in the “Generator” test tools platform

The HVC plug test lets you apply high tension to the HV circuit without tube current

This allows the HV circuit to be systematically reduced using 2 types of test plugs to isolate a high tension fault to either the Straton MX tube,

HV tank,

No radiation is released during this test procedure

Prerequisites

-> part no

Delivered with the system

-> part no

The HVC plug test is only allowed with test plugs installed

Tests with the installed tube can result in misdiagnosis of failures

For the installed tube,

Performing the HVC plug test 1

Install the relevant test plugs in the HV sockets (front) or HVT

a) Switch off system (select System

-> END)

SOMATOM Definition

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Press service switch S1 in PDC_A (Service Push-Button S1 in PDC-A / p

Open the gantry covers as needed

Disable gantry rotation with switch S 301

Remove HV plugs and install the test plugs

¹ HV sockets at front: When installing test or HV plugs,

¹ HVT sockets: When installing test or HV plugs,

new silicon disks must be used

f) Switch system on (S301 remains switched off)

¹ S301 has to be switched off because during Init the Rot FW searches for an index pulse

This may result in a 360 degree rotation of the gantry

In this case the removed HV cables may damage parts in the gantry

Select Local Service

Select HVC plug A or HVC plug B test

Click “Go” on the virtual user panel

Follow the instructions in the dialog

Important work steps are listed below: 5

Click the Start button at the control box

The test runs for 80 seconds

The test is terminated automatically with error message from UMAR (scan time exceeded)

follow the HV troubleshooting guide (High voltage / p

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New silicon insulators at the HV sockets (HV plug installation at HV sockets / p

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SOMATOM Definition

Filament

TSG filament

The filament function is tested during “Init” (e

COPMP/ON

-> SYS/ON)

After switching the gantry off/on,

a self-test of the D770 (FIL power) in XGR is performed as step 1

In step 2,

a filament current is sent to the filament heating in the XRT (X-ray tube),

passing the filament transformer at XRT

If the self-test fails,

the error message XRS_111 (XGR FIL Selftest Error) is sent to the logbook

Additionally a test utility "FIL" is available in the "Tube/Generator" test tools platform

During the "INIT" filament test,

the involved D700/D770 board components in the XGR and the filament current to the XRT are tested (only in/out test)

With the "FIL" test,

the involved filament components and the filament regulation function are tested

So the "FIL" test is a more detailed test option

Remark: Test can be used if system is in or is not in standby status

Filament test

• Switch gantry off/on using the control box (COMP/ON

• Check in the EventLog for the error message CT_GSA/GRA_20 (XGR FIL Selftest Error)

• Perform the "FIL" test function

XRT and 2

XGR assembly

Filament

Filament test This test checks the function of the filament power board (FIL-Power) in XGR box,

the cable connection to the XRT,

the filament transformer at XRT,

and the filament heating in the tube itself

No radiation is released during this test procedure

Performing the filament test 1

Select Local Service

Select FIL 3

Click GO and follow the instructions in the dialog

The test is terminated automatically

SOMATOM Definition

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Anode rotation (RAC)

TSG Anode Rotation (RAC)

An RAC frequency test function is available beginning with VA20

Use this test function to verify the RAC function

There are different anode speed (Hz) selections possible

In the troubleshooting instructions below,

An RAC extended test function is available beginning with VA20

Use this test function to check the rotating anode revolution with respect to the time (acceleration)

The following statements are possible:

rotating anode bearing defective,

rotating anode motor defective,

rotating anode bearing defective,

Note: Test needs the system in standby status

Note: Anode rotation on a Staton MX P tube may not be started without a functioning and connected cooling circuit (e

Anode rotation (RAC) test

• Perform AnodeRot Frequency Local Service > Test Tools > Tube/Generator > RAC and select 160 Hz

• Perform AnodeRot Frequency Local Service

RAC anode movement test 2

RAC acceleration test 3

RAC maximum speed test

Possible cause of error: no revolution

Check cable connection W604 between XGR (X6) > XTA (X2) for broken wire or bad contact

Rotating anode motor defective > change XRT

XGR assembly defective > change XGR assembly

Possible cause of error: revolution in the medium revolution range is too low

Rotating anode bearing defective > change XRT

XGR assembly defective > change XGR assembly

Possible cause of error: upper revolution range not reachable

Rotating anode bearing defective > change XRT

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SOMATOM Definition

Single pulse test

Single pulse test

The single pulse test allows you to identify problems from the inverter assemblies up to the HV_Tank by triggering the inverters for a single pulse

Use the single pulse test after performing the TSG “High voltage” (High voltage tests / p

Please use a memory oscilloscope to measure the output of the single pulse test

Single pulse test

Perform the single pulse test (Performing the single pulse test / p

¹ In addition to the given test result,

check the UT_act value in the relevant test message in the Eventlog

If UT_act parameter is E 0x50 0x02 0x57 0x1B 0x

No problem on inverter part

If UT_act parameter is E 0x50 0x00 0x4D 0x09 0x

Continue with item 2

Perform single pulse test (Performing the single pulse test / p

Follow the dialog of the HVC plug test to install the test plugs ¹ In addition to the given test result,

check the UT_act value in the relevant test message in the Eventlog

If UT_act parameter is E 0x50 0x02 0x57 0x1B 0x

If UT_act parameter is E 0x50 0x00 0x4D 0x09 0x

Continue with item 3

Compare the output diagram of the scope,

the enclosed example diagrams and tolerance values shown below

The time for a single pulse has to be 9 microseconds +/- 20%

The current should have a peak value of +170A +/- 20% or

The tube voltage (UT_act) should have a peak value above 10 kV

¹ If the current is too high and/or the tube voltage is too low,

check the MVT and HVT cabling (short circuit) ¹ If cabling is o

> replace parts in the following order: 1

Relevant inverter

Prerequisites

SOMATOM Definition

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Move the XGS_Control assembly out of the PDC to get better access

The power at the XGS control is 24 V and 5 V

Do not touch any parts on the XGS control

Connect the probes only as described below

To get better information,

it is recommended to use a 3 channel scope as described below

If only a 2 channel scope is available,

measure UT_act first and then I_load to get the necessary information

Connect scope:

Adjust scope

Select Local Service > Test Tools > Tube/Generator 5

Select Unset all in the generator application

Select Single Pulse 7

Press the Start button on the virtual user panel

¹ The test is terminated automatically

¹ The time for a single pulse has to be 9 microseconds +/- 20%

¹ The current should have a peak value of +170A +/- 20% or

¹ The tube voltage (UT_act) should have a peak value above 10 kV

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SOMATOM Definition

Single pulse test diagrams

The first 2 images are good examples

the last 2 images are error examples

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Error examples Short-circuit at the oscillating current cable (MV cable) in the HV tank

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SOMATOM Definition

Short-circuit at inverter output

SOMATOM Definition

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The “Arcing” test is used from the lab to simulate arcings to verify that the FW/SW reaction due to arcings is correct

This test is not service-relevant

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SOMATOM Definition

XRS hints

This is a summary of troubleshooting hints obtained from experience

XRS hints

The XGS_PDC control assembly A/B are identical

XGS_PDC control A assembly controls the complete switch-on process of most system parts

If this part becomes defective,

the system components will not switch on

For troubleshooting and to ensure that the system components are switched on again (in case control assembly A is defective),

exchange the XGS_PDC control A in PDC_A with XGS_PDC control B in PDC_B

Exchange XGS_PDC control A in PDC_A with XGS_PDC control B in PDC_B in accordance with the “Replacement of parts PDC” instructions

After replacement,

the guided tour for replacing parts has to be performed for the XGS_PDC_Control

Always install the Dongle plug (including the 120 ohm CAN bus resistor) at XGS_PDC control B plug X3

The inverter 1 and inverter 3 cable connections can be exchanged for troubleshooting (both inverters are identical)

Remove inverter plug X23 (inverter 1) and