© Siemens, 2006
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SOMATOM Definition
Gantry
Troubleshooting Guide
CT
C2-028.840.01.09.02 EnglishInstructions for Troubleshooting
© Siemens, 2006 07740777
1Copyright / Version / Disclaimer
Copyright
“© Siemens, 2006“ refers to the copyright of a Siemens entity such as Siemens Aktienge-sellschaft - Germany, Siemens Shenzhen Magnetic Resonance Ltd. - China, Siemens Shanghai Medical Equipment Ltd. - China, Siemens Medical Solutions USA Inc. - USA and/or Siemens Healthcare Diagnostics Inc. - USA.
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 corre-spond 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.healthcare.siemens.com.
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 Sie-mens 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.
0Table of Contents
1 _______ General ________________________________________________________ 7
Safety information. . . 7
Safety warnings . . . 7
Information for switching off the gantry power . . . 10
Service Push-Button S1 in PDC-A . . . 11
Safety bolts. . . 12
Data ring protection . . . 14
2 _______ XRS __________________________________________________________ 15
General. . . 15Safety . . . 15
Notes. . . 15
Definitions and abbreviations . . . 15
Prerequisites . . . 16
Overview. . . 17
Problem isolation . . . 17
Generator oscillator procedure (GenOSC) . . . 17
Flowchart for HV Troubleshooting . . . 18
XDC/Tube . . . 20
XDC/Tube Test . . . 20
XDC/Tube test. . . 20
High voltage . . . 21
TSG high voltage . . . 21
Check/adjust the tube oil pressure . . . 23
HV plugs with arcing tracks. . . 26
HV plug installation at HV sockets . . . 28
High voltage tests . . . 29
Filament . . . 32
TSG filament . . . 32
Filament . . . 32
Anode rotation (RAC) . . . 33
TSG Anode Rotation (RAC) . . . 33
Single pulse test . . . 34
Single pulse test . . . 34
Single pulse test diagrams . . . 36
Arcing . . . 39
XRS hints . . . 40
Switching on status display of XGS . . . 41
Measuring points . . . 43
Measuring points D700, D701, D702, D703 . . . 43
LED´s on D700, D701, D702, D703 . . . 49
3 _______ DMS__________________________________________________________ 56
General. . . 56Safety. . . 56
Notes . . . 56
Definitions and abbreviations. . . 57
Prerequisites . . . 57
TSG Image Quality . . . 58
General . . . 58
TSG strong rings . . . 59
TSG sporadic strong rings. . . 60
TSG weak rings . . . 62
TSG sporadic weak rings . . . 63
TSG rings in outer slices only . . . 63
TSG Streak artifacts . . . 64
TSG Dual Source problems. . . 65
TSG Spatial Resolution (bad MTF results) . . . 67
TSG other artifacts . . . 68
Tests for Image Quality . . . 69
TSG DMS Components . . . 88
TSG DMS Power path . . . 88
TSG UHR mechanics . . . 90
Additional Tests & Hints . . . 96
Storage of Test Results . . . 96
Environmental Conditions . . . 96
Hints for defective channel detection . . . 97
Separate between module and other components . . . 98
How to interpret the physicist’s line . . . 99
4 _______ Datalink ______________________________________________________ 100
General . . . 100Safety. . . 100
Notes . . . 100
Definitions and abbreviations. . . 100
General: Receivers with Revision <B . . . 101
Prerequisites . . . 101
TSG Datalink. . . 103
TSG permanent errors on DAS Controller/s -> IRS Receiver/s. . . 103
TSG data quality at Tx module . . . 105
TSG data quality at RX modules . . . 106
TSG sporadic errors in link DCON -> IRS . . . 107
Step 1 (checking). . . 108
Step 2 (debugging) . . . 108
Step 3 (localizing) . . . 109
Tests for data transmission . . . 114
Cleaning a fiber optic cable . . . 114
Data Link Test . . . 114
Appendix . . . 118
How to check the transmitting antenna . . . 118
5 _______ Fastlink ______________________________________________________ 121
General. . . 121
Safety . . . 121
Notes. . . 121
Definitions and abbreviations . . . 122
General: Receivers with Revision <B . . . 122
Prerequisites . . . 122
TSG Fastlink . . . 124
TSG rotating fastlink connections . . . 124
TSG stationary fastlink connections . . . 125
TSG for connection UMAS -> UMAR . . . 127
TSG for connection UMAR -> UMAS . . . 130
TSG data quality at Tx modules . . . 132
TSG data quality at Rx modules . . . 133
Tests for data transmission . . . 134
6 _______ Rotating Gantry _______________________________________________ 138
General. . . 138Safety . . . 138
Notes. . . 138
Definitions and abbreviations . . . 138
Prerequisites . . . 138
CAN Bus. . . 139
TSG CAN bus (rotating part). . . 140
TSG CAN bus to XGS. . . 141
Stop report loop . . . 145
TSG stop report loop . . . 145
Rotating controller . . . 149
DOM . . . 149
COC (Tube collimator) . . . 149
System Tests . . . 152
DOM functional . . . 152
X-ray timeout test . . . 153
7 _______ Stationary Gantry______________________________________________ 154
General. . . 154Safety . . . 154
Notes. . . 154
Definitions and abbreviations . . . 154
Prerequisites . . . 154
CANopen Bus. . . 155
TSG CAN open bus . . . 155
Stationary controller tests. . . 158
Prerequisites . . . 158
Master stationary (MAS) test . . . 158
Gantry panel control (GPC) test . . . 158
8 _______ Cooling System _______________________________________________ 160
Cooling System . . . 160 Water Cooling . . . 160 Air Cooling . . . 168
9 _______ Changes to Previous Version ____________________________________ 174
10 ______ Index ________________________________________________________ 175
1-1General
Safety information
0Only qualified and system-trained service staff is allowed to perform CT system installation, service , 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 (TD00-000.860.01.xx.xx). Please read and observe the Product- specific safety notes (C2-028.860.01.xx.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-spe-cific safety notes.”
•
Safety information related to the method of risk management (C2-028.860.01 / General safety warnings).•
General safety information such as the handling of service documentation, CT system training request, X-ray protection, electrical protection, service tools....(C2-028.860.01 / General safety information).•
General safety information about working in the gantry with the power off/on(C2-028.860.01 / Working in the gantry with gantry power off).
•
Use of the patient table as lifting device for gantry part replacement (C2-028.860.01 / Usage of patient table as lifting device).•
Laser products (C2-028.860.01 / Laser Products).•
Attachment of screws and nuts, use of Loctite, adjustment instructions for the torque wrench (C2-028.860.01 / Screw Connections).Safety warnings
0The following safety information is an extract of the information in the Product-specific safety notes (C2-028.860.01.xx.xx) (C2-028.841.01 / Safety information). It is mandatory to read and observe the safety information described below.
CAUTION [ hz_serdoc_F13G02U01M04 ]
Flammable sprays. Risk of inflammation!
¹ Only use approved and recommended cleaning agents as described.
CAUTION [ hz_serdoc_F13G07U01M01 ]
Handling parts of the system that may have come into con-tact 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.g. wear gloves).
WARNING [ hz_serdoc_F13G01U13M02 ]
High voltages and/or mechanical movements (e.g. 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 [ hz_serdoc_F13G01U03M01 ]
Not following X-rays protective regulations may lead to radi-ation exposure to you and/or other persons.
Risk of radiation exposure!
Observe radiation protection regulations when X-rays are switched on, e.g. :
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.g. lock doors if necessary) .
WARNING [ hz_serdoc_F13G01U05M03 ]
Dangerous voltages are present when the system is switched on. Dangerous voltages may be present even when the sys-tem 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.g.
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 [ hz_serdoc_F13G01U06M01 ]
Rotating parts are exposed when gantry covers are opened. Risk of injury!
CAUTION [ hz_serdoc_F13G05U01M04 ]
Unfixed parts/cables during gantry rotation. Risk of accident and injury!
¹ Make sure that all parts and cables are mounted prop-erly before starting rotation.
CAUTION [ hz_serdoc_F13G02U01M01 ]
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.
Information for switching off the gantry power
1.1•
Switch off system (Click <SYSTEM> and select <END> 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 (C2-028.841.01 / Service Push-Button S1 in PDC-A). Secure against unintended switch-on.NOTE Read and observe the safety information in the “Product-spe-cific 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.
Service Push-Button S1 in PDC-A
1.2Fig. 1: Service push-button S1
Pos. 1 Service push-button S1 Pos. 2 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, F3, F5, F6, F7, 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.
Safety bolts
1.3•
Front safety bolt -> located at bottom right gantry front•
Back safety boltFig. 2: Rotation safety lock - unlock position Fig. 3: Rotation safety lock - lock position
•
Unlock position of gantry front safety bolt (item 1)•
Lock position of gantry safety bolt (item 2).Fig. 4: Rotation safety lock - back
•
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)posi-tion. If the bolt accidentlally moves into the lock position during rotation, the gantry may be damaged.
•
Principle function of back safety boltFig. 5: Back safety block - unlock position Fig. 6: Back safety block - lock position
•
Unlock position of gantry front safety bolt (left image, item 1). 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, item 2). From unlock position (item 1), lift the safety bolt and rotate it 90 degrees to bring it into the lock position (item 2).Data ring protection
1.4•
Installing data ring protectionFig. 7: Data ring protection
•
Install the 2 data ring protectors (e.g. item 1) before working at the gantry front.- 2 Plexiglas protectors are necessary to cover a larger area on the data ring. - Attach them to the stationary data ring.
2-2XRS
General
0Safety
0WARNING [ hz_serdoc_F13G01U12M03 ]
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”.
Notes
0This section contains information on isolating XRS problems
•
Section “General” -> General information..•
Section “Overview” -> XRS Information.•
•
Section “High voltage” -> High voltage TSG followed by high voltage test descrip-tions.•
Section ”Filament” -> Filament TSG followed by filament test description..•
Section ”Anode rotation” -> Anode rotation TSG followed by RAC test description..•
Section ”XRS hints” -> XRS hints.•
Section ”Measuring point” -> Table of LEDs and measuring points on XGS/XRS.Definitions and abbreviations
0Tab. 1 Definitions and abbreviations
Term Definition / Abbreviation
XDC X-ray deflection control
XGR X-ray generator, rotating
XGS X-ray generator, stationary
XRS X-ray system
XRT X-ray tube
XTA X-ray tube assembly
XTC X-ray tube cooling
Prerequisites
0 Documentsn.a
Tools and auxiliary equipment
•
Standard tool kit•
HV test plugsHVT High voltage tank
TSG Troubleshooting guide
Overview
2.1 The XRS section contains information on possible XRS tests and the corresponding trou-bleshooting guides. In the SOMATOM Definition, troutrou-bleshooting 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 trouble-shooting.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
0Principle problem isolation in case of XRS problems 1. Find relevant error message in Eventlog
NOTE The XGR and XGS assemblies are continuously communicat-ing uscommunicat-ing the CAN bus after the system is switched on. For this reason, 2 error messages are usually sent to the log-book after XRS problems. Always check both (XGS/XGR) error messages when troubleshooting.
2. 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 prob-lem. In some cases, you will be linked to this Test and Troubleshooting instruc-tions, # C2-028.840.01.... In this case, follow the relevant troubleshooting instructions described in this document.
Generator oscillator procedure (GenOSC)
0Generator 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; otherwise, 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.
NOTE If GenOsc fails because of arcing, try using dummy plugs (i.e. test plugs for HVT) and perform GenOsc again with dummy plugs installed.
Flowchart for HV Troubleshooting
0 The flowchart (Fig. 8 / p. 19) gives a guideluine how to deal with tube arcings and repre-sents the algorithm behind the tool “SOMATOM Definition HV Troubleshooting”. For more information regarding this tool, see the documentation for CT016/09/R., 2 006 C2-02 8 .8 40.01 .09 .0 2 SOMA T O M De 08.11 H CX CS SD CR-CT P age 1 9 of 17 6 ter nal use on ly
XDC/Tube
2.2XDC/Tube Test
0INIT 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 sys-tem state, the XDC/Tube self-test tolerates some problems. So, 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, prob-lems within cabling, or probprob-lems within the tube. The test can be helpful if the XDC has aborted scans with the error message "CT_DCA/B 51 ..." or "CT_DCA/B 50", especially if parameter 3 is 0x00, 0x01, 0x04, 0x05, 0x08, 0x09, 0x12, 0x17, 0x1D, 0x1E or 0x1F. Be aware that any of these errors can happen during arcing as well, without any real HW prob-lem within the XDC or the tube. If the INIT tests fail, you have a probprob-lem in the XDC, cabling, or the tube. 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
0XDC/Tube test
Performing the filament test
1. Select Local Service > Test Tools > Tube/Generator 2. Select XDC/Tube.
High voltage
2.3TSG high voltage
0The 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.
NOTE XRS components cannot be exchanged from system A to system B or vice versa for troubleshooting.
NOTE Always use new silicon insulators at the HV sockets ((HV plug installation at HV sockets / p. 28)) as well as new silicon disks at the HVT when installing the cable plugs or the test plugs.
Tab. 2 High voltage TSG
Step Action
1
•
Check Eventlog for UT max and /or UT too high errors (e.g XRS_83) or arc-ing problem (XRS_68).•
If there are UTmax and /or UT too high errors, perform GenOSC (Local Ser-vice -> Tune Up -> Expert Mode -> GenOSC).a) if GenOSC is aborted due to a problem -> continue with item 2
b) if the HV problem is not solved after GenOSC -> continue with item 3. c) if the HV problem is solved -> GenOSC tables are stored in D700 XGS.
No further action necessary.
2
•
If there is any doubt that the oil pressure is correct, check the oil pres-sure.Too low oil pressure especially in the “older”1.05bar- typ of Definition tubes is very critical compared to 1.25bar- tybe of tubes.•
Perform GenOSC with installed test plugs. See (HVC plug test / p. 30) for test plug installation.a) if the GenOSC still aborts -> check the Eventlog for CT_GSA/GRA messages and follow the instructions given in the error message. b) if the GenOSC is ok -> try GenOSC again with installed X-ray tube -> if
problem recurs, change XRT (X-ray tube).
3
•
Perform Gettering (Local Service -> Tune Up -> Expert Mode -> Getter). a) if the HV problem is not solved after gettering the tube -> continue withitem 4
4 1. Switch off system (select System -> END) and press service switch S1 in PDC_A (Service Push-Button S1 in PDC-A / p. 11).
2. Switch off rotation enable switch S301.
3. Remove HV plugs from the HV sockets (beside the tube). 4. Remove insulators from the HV plugs.
5. Check HV plugs and the 2 insulators for signs of arcing (black dots or stripes)
(HV plugs with arcing tracks / p. 26).
a) If there are any signs of arcing -> continue with item 5 b) If there are no signs of arcing -> continue with item 6.
5
•
If there are any signs of arcing on the plugs, HV sockets, or the insulators. 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 -> change the relevant part(s).
c) If there are no signs of arcing remaining on the parts -> reinstall HV plugs using new silicon insulators (HV plug installation at HV
sockets / p. 28).
d) Try scanning again -> if the HV problems reoccur continue with item 6. 6
•
Perform HVC tube test. Follow the dialog of the HVC tube test (tube test withHV but without load).
a) If there are no XRS HV error messages found in the logbook -> continue with item 11.
b) If there are XRS HV error messages found in the logbook -> continue with item 8.
7
•
Perform HV plug test with installed dummy plugs ( #10 093 700) at HV sock-ets (HVC plug test / p. 30). Follow the dialog of the HVC plug test. (Local Service --> Test Tools --> Generator --> HVC plugs)¹ The HV test plugs have to be installed using new insulators and have to tightened with a torque of 25 Nm . (HV plug installation at HV sockets / p. 28)
a) If the test is aborted after 80 s by the UMAR (scan time exceeded), there is no HV problem on generator side --> change tube.
b) If there are still XRS HV error messages found in the logbook -> con-tinue with item 8.
Check/adjust the tube oil pressure
0 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, when the tube gets hot.
The more likely case, though, 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 1.25 bar.
8 1. Switch off system (select System -> END) and press service switch S1 in PDC_A (Service Push-Button S1 in PDC-A / p. 11).
2. Switch off rotation enable switch S301.
3. Remove HV plugs from the HVT (high voltage tank).
4. Check HV plugs and the 2 silicon disks for signs of arcing (black dots or stripes) (HV plugs with arcing tracks / p. 26).
a) If there are any signs of arcing -> continue with item 9 b) If there are no signs of arcing -> continue with item 10. 9
•
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.g. cracks) remain on the HV cable plugs or HVT sockets -> change the relevant part(s).
c) If there are no signs of arcing remaining on the parts -> reinstall HV plugs into HVT using new silicon disks.
d) Try scanning again -> if the HV problems reoccur continue with item 10. 10
•
Perform HVC plug test scans with installed dummy plugs (#1621791) at HVT(HVC plug test / p. 30). Follow the dialog of the HVC plug test.
a) If there are no XRS error messages found in the logbook (UMAR errors are acceptable) -> change both HV cables including the HV sockets. b) If there are XRS error messages found in the logbook -> change HVT. 11
•
The HV problem is related to tube load.Possible reasons: Inverter problem, ground problem, HVT.
a) Check Eventlog for XRS errors related to inverters -> if there are any fol-low the instructions given in the error message.
b) Check ground connections (bad contact....) of the XRS parts.
NOTE From 11/2009 on, new tubes need a pressure of 1.25 bar (+ altitude correction). 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, and on newer tubes to 1.25 bar according to the label.
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, e.g., the Straton tube, XTC, etc. 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.•
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.Fig. 9: Adjusting unit for expansion membrane
•
Install the adjustment handle (item 1) on the expansion vessel. - Press the button (item 2) to lock the thread rod on the membrane. - Hand-tighten the 2 screws of the adjustment thread rod (item 3).NOTE The pressure indicator at the expansion vessel shows the actual pressure in the oil circuit after the oil hose from expan-sion vessel has been connected.
•
Check/adjust the oil pressure.Fig. 10: Adjusting the tube pressure
•
Check the pressure at the pressure indicator (item 2) attached to the expan-sion vessel using the expanexpan-sion handle (item 1).The correct pressure for tubes without a label is 1.05 bar +/- 0.05 bar at 20°C at sea level. See following table for altitude correction of pressure. Newer tubes are clearly labelled with a sticker that requests a pressure of 1.25 bar at sea level.
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” 1.05bar tube needs to be adjusted there, the correct pres-sure would be 1.05bar + 0.39bar = 1.44bar
In Mexico City (Mexico, altitude 2300m), the same tube would be adjusted to 1.3 bar, and in Hamburg (Germany, app. sea level) it would be 1.05bar.
Likewise, for “newer”1.25bar tubes, the correction factor has to be con-sidered.
Altitude [m] Difference [bar]
0 0.00
500 0.06
1000 0.12
•
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, F3, F5, F6, F7, and F11 in the PDC A and F2 in the PDC B.¹ First switch the F2, F3, F5, 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
0HV plugs and insulators with arcing tracks
2000 0.22 2500 0.27 3000 0.31 3500 0.35 4000 0.39 4500 0.43 5000 0.47
•
If the pressure is not correct, adjust the membrane position using the adjust-ment 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. Altitude [m] Difference [bar]Fig. 12: HV plug with signs of arcing
HV plug installation at HV sockets
0 1. Prepare the high voltage connectors and test plugs.Fig. 14: Silicon oil on HV plugs Fig. 15: Silicon oil on HV 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, item 1). 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.2. Prepare the high voltage connectors.
3. Tighten the HV plugs.
High voltage tests
0Description of available HV tests.
Fig. 16: Silicon oil on HV plugs Fig. 17: HV sockets
•
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, arrow).•
Hand-tighten the fastening rings.Fig. 18: Tightening the HV plugs
•
Tighten the HV plugs using the special tightening tool (delivered with the system) with a torque of 25 Nm.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 -> Test Tools -> Generator --> HVC tube.. 2. Select Ttube A or B.
3. Click “Go” on the virtual user panel. Follow the instructions in the dialog. 4. Click the Start button at the control box.
The test runs for 80 seconds. The test is terminated automatically with an error mes-sage 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, or the HV cables. No radiation is released during this test procedure.
Prerequisites
•
Dummy plugs (mini type) -> part no.10 093 700 types for plug into the HV sockets. Delivered with the system.•
Dummy plugs (normal type) -> part no. 16 21 791 types for plug into the HV tank. NOTE 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, use the HCV tube test instead.
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).
b) Press service switch S1 in PDC_A (Service Push-Button S1 in PDC-A / p. 11). c) Open the gantry covers as needed.
d) Disable gantry rotation with switch S 301. e) Remove HV plugs and install the test plugs.
¹ HV sockets at front: When installing test or HV plugs, new insulators must be used.
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.
2. Select Local Service -> Test Tools -> Generator -> HVC plugs. 3. Select HVC plug A or HVC plug B test.
4. 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).
-> If the test fails, follow the HV troubleshooting guide (High voltage / p. 21).
NOTE New silicon insulators at the HV sockets (HV plug installation at HV sockets / p. 28)) as well as new silicon disks in the HVT have to be used for the HV cable and test plugs before the plugs are installed into the components (HV sockets / HVT).
Filament
2.4TSG filament
0The filament function is tested during “Init” (e.g., 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 fil-ament transformer at XRT. If the self-test fails, the error message XRS_111 (XGR FIL Self-test 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 fil-ament current to the XRT are tested (only in/out test). With the "FIL" test, the involved fila-ment components and the filafila-ment 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.
Tab. 3 Filament test
Filament
0Filament 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 -> Test Tools -> Tube/Generator. 2. Select FIL
3. Click GO and follow the instructions in the dialog. The test is terminated automatically.
Step Action
1
•
Switch gantry off/on using the control box (COMP/ON -> SYS/ON) to per-form an XGR INIT2
•
Check in the EventLog for the error message CT_GSA/GRA_20 (XGR FIL Selftest Error).-> if the error message was sent to the logbook during INIT -> follow the trou-bleshooting instructions given in the error message.
-> if the error message was not sent to the logbook during INIT -> continue with item 3.
3
•
Perform the "FIL" test function.Anode rotation (RAC)
2.5TSG Anode Rotation (RAC)
0An 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, 160 Hz is selected because this is very stressful for the RAC function (Note: Do not use this selection in quick succession to avoid overload). 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:
- No revolution -> e.g., rotating anode bearing defective, bad cable/plug connection, XGR... - Revolution in the medium revolution range is too low -> e.g., rotating anode motor defec-tive, XGR....
- Upper revolution range not reachable -> e.g., rotating anode bearing defective, XGR... 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.g., for troubleshooting).
Tab. 4 Anode rotation (RAC) test
Step Action
1
•
Perform AnodeRot Frequency Local Service > Test Tools > Tube/Generator > RAC and select 160 Hz.-> if the RAC test fails -> continue with item 2. -> if the RAC test is ok -> no further action.
2
•
Perform AnodeRot Frequency Local Service -> Test Tools -> Tube/Generator and select the following RAC extended tests:1. RAC anode movement test 2. RAC acceleration test 3. RAC maximum speed test
•
If test 1 fails -> continue with item 3•
If test 2 fails -> continue with item 4•
If test 3 fails -> continue with item 53 Possible cause of error: no revolution. 1. Check cable connection W604 between XGR (X6) > XTA (X2) for broken wire or bad contact. 2. Rotating anode motor defective > change XRT. 3. XGR assembly defective > change XGR assembly.
4 Possible cause of error: revolution in the medium revolution range is too low. 1. Rotating anode bearing defective > change XRT. 2. XGR assembly defective > change XGR assembly.
5 Possible cause of error: upper revolution range not reachable. 1. Rotating anode bearing defective > change XRT
Single pulse test
2.6Single pulse test
0The 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 per-forming the TSG “High voltage” (High voltage tests / p. 29) as a last step or if there is IMAX/UB MAX parameter information identified in an error message. Please use a memory oscilloscope to measure the output of the single pulse test.
Tab. 5 Single pulse test
Step Action
1 Perform the single pulse test (Performing the single pulse test / p. 35) with a nor-mally connected tube.
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... 0x... 0x00 > test was successful. No problem on inverter part.
If UT_act parameter is E 0x50 0x00 0x4D 0x09 0x... 0x... 0x00 > test was not successful. Continue with item 2.
2 Perform single pulse test (Performing the single pulse test / p. 35) with installed test plugs (#1621791) (HVC plug test / p. 30). 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... 0x... 0x00 > test was successful > X-ray tube problem > exchange X-ray tube.
If UT_act parameter is E 0x50 0x00 0x4D 0x09 0x... 0x... 0x00 > test was not successful. Continue with item 3.
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 -170A +/- 20% (alter-nating).
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.k. > replace parts in the following order: 1. MVT
2. HVT
Performing the single pulse test
1. Move the XGS_Control assembly out of the PDC to get better access.
NOTE 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 chan-nel scope as described below. If only a 2 chanchan-nel scope is available, measure UT_act first and then I_load to get the necessary information.
2. Connect scope: - Channel 1
- XGS D701 > X211 UT_act (1 V = 20KV) - ANA_GND > XGS D700 > X87
- Adjust scope to 1 V/div - Channel 2
- XGS D701 > X5 I_load (1 V = 50A) - ANA_GND > XGS D700 > X87 - Adjust scope to 1 V/div
- Channel 4
- XGS D700 > X104 N_Start_inv - GND > XGS D700 > X112 - Adjust scope to 5 V/div 3. Adjust scope
- Time base 20 microseconds
- Trigger channel 4 (neg. slope, single)
4. Select Local Service > Test Tools > Tube/Generator 5. Select Unset all in the generator application.
6. 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 -170A +/- 20% (alter-nating).
Single pulse test diagrams
0 The first 2 images are good examples; the last 2 images are error examples.Fig. 20: Single Pulse test diagram
Error examples
Fig. 21: Single pulse test diagram
Short-circuit at inverter output
Arcing
2.7 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.XRS hints
2.8 This is a summary of troubleshooting hints obtained from experience.Tab. 6 XRS hints
Step Action
1 The XGS_PDC control assembly A/B are identical. XGS_PDC control A assem-bly controls the complete switch-on process of most system parts. If this part becomes defective, the system components will not switch on. For trouble-shooting 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.
1. 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.
2. Always install the Dongle plug (including the 120 ohm CAN bus resistor) at XGS_PDC control B plug X3.
2 The inverter 1 and inverter 3 cable connections can be exchanged for trouble-shooting (both inverters are identical).
1. Remove inverter plug X23 (inverter 1) and X43 (inverter 3) from the XGS_PDC_Control backplane.
2. Install inverter plug X23 (inverter 1) in the X43 backplane plug and X43 (inverter 3) in X23 backplane plug on the XGS_PDC_Control backplane.
¹ If the error moves with the inverter -> inverter is defective.
¹ If the error does not move with the inverter -> inverter and inverter cable ok, check for other problems such as the cable connection, ground connection, or check for other error messages produced along with the inverter error message. Follow the instructions given in this message.
Switching on status display of XGS
2.9 The seven-segment display on XGS board D700 (see image below) indicates the XGS sta-tus from switching on the system up to scan execute. The stasta-tus information of the display is to be used to obtain information as to the system state when a problem occurs. This infor-mation can be used for troubleshooting.Measuring points
2.10Measuring points D700, D701, D702, D703
0D700 measuring points
Fig. 25: D700 main board
Tab. 7 Oscillating current measuring points
Tab. 8 Oscillating current and dose act. measuring points
item signal name short name valid at
description
measur-ing point 1 I_load_MVT I_L_MVT XGS oscillating current MVT
(sec-ondary) 1 V = 50 A.
X66
1 I_load_INV5 I_L_Inv5 XGS oscillating current Inverter 5 / 1 V = 50 A.
X67
item signal name short name valid at
description
measur-ing point 2 I_load_INV3 I_L_Inv3 XGS oscillating current Inverter 3 / 1
V = 50 A.
X77
2 Dose_act Dose_act XGR actual dose value from fast link 1 V = 13.107 value
* other similar values with D703 Fastlink control register selectable.
Tab. 9 Voltage supply measuring points
Tab. 10 Ground measuring points
Tab. 11 HW interrupt for ignition pulses main inverter
Tab. 12 Tube voltage measuring points
item signal name short name valid at
description
measur-ing point
3 P15V P15V XGS +15 V Voltage supply X69
3 N15V N15V XGS -15 V Voltage supply X71
3 UDC UDC Intermittent voltage X73
3 VCC VCC XGS + 5 V Voltage supply X75
3 ANA_GND ANA_GND XGS analog ground X78
3 GND GND XGS ground X80
item signal name short name valid at
description
measur-ing point
4 VCC VCC XGS +5 V voltage power supply X75
4 ANA_GND ANA_GND XGS analog ground X78
item signal name short name valid at
description
measur-ing point
5 S1 S1 XGS Ignition switch: HW interrupt of
the ignition pulses from the main inverter. Normal position is off - V162 must be off. No function in XGR. Normal posi-tion is off.
n.a
item signal name short name valid at
description
measur-ing point 6 P_UT act P_UT act XGR positive tube voltage 1 V = 10
kV.
X81
6 N_UT act N_UT act XGR negative tube voltage 1 V = 10 kV.
X83
6 UT_act UT_act XGR Tube voltage 1 V = 20 kV. X85
Tab. 13 IT act. measuring points
Tab. 14 Service switch
Tab. 15 IT act. measuring points
Tab. 16 FPGA voltage measuring points
Tab. 17 FPGA voltage measuring points
item signal name short name valid at
description
measur-ing point
7 MA_meas_1 1 XGR IT_act measurement point 1
for ampere meter.
X61
7 MA_meas_2 IT_nom XGR IT_act measurement point 2 for ampere meter.
X59
Item Signal name
short name valid at
Description
Measur-ing point
8 S5 S5 XGR Switch must be on for IT_act
measurements using a ampere meter at measuring points X46, X48, X50, X59, X61. LED V202 is on if switch is activated. Normal position is off.
n.a
item signal name short name valid at
description
measur-ing point
9 IT_act IT_act XGR actual tube current X48
9 IT_nom IT_nom XGR nominal tube current X50
9 ANA_GND ANA_GND XGR analog ground X46
item signal name short name valid at
description
measur-ing point
10 VCC3.3 VCC3.3 XGS +3.3 V I/O voltage FPGA X20
10 VCCINT VCCINT XGS +1.5 V core voltage X44
item signal name short name valid at
description
measur-ing point
11 S2 S2 XGS
XGR
Service switch: Switch has no function at this time. Neverthe-less, switch must be in off posi-tion. LED V6 must be off.
Tab. 18 FPGA digital out
Tab. 19 FPGA digital out
D701 HVC board measuring points
Fig. 26: D701 measuring points
Item signal name short name valid at
description
measur-ing point 12 N_Start_FIL
_INV
FIL XGR Start FIL inverter (low active). Can only be used in XGR.
X100
12 N_Start_RA C_INV
RAC XGR Start RAC inverter (low active). Can only be used in XGR.
X102
12 N_Start_HV _INV
INV XGS Start HV inverter (low active). X104
12 XC XC XGS XC signal (X-ray request) X106
12 XRAY_on XRAY XGS XRAY on signal (> 20 kV) X108
12 INV_Fault Inv_err XGS Summary error HV inverter Can only be used in XGS.
X110
12 GND GND XGS
XGR
Ground X112
Item signal name short name description measur-ing point 13 S3/S4 n.a Dip switches for debug and
configura-tion of the FPGA - not for service use. n.a
Tab. 20 D701 HVC board measuring points
D702 FIL/RAC board
Tab. 21 D702 FIL measuring points
Item signal name short name valid at
description
measur-ing point 1 UT_act UT_act XGS Actual tube voltage (from
rotat-ing part over fast link) 1 V = 20 kV
X211
1 U_control U_con XGS Set value for kV regulator X216
1 I_load_act I_L_A XGS Actual oscillating current. 1 V = 50 A
X215
1 USTU USTU XGS Set value for kV regulator.
(Voltage control cycle). -5 V ... 0 V
X208
1 I_load_nom I_L_N XGS Nominal oscillating current. 1 V = 50 A
X207
1 UDC_act UZ_act XGS Actual intermediate circuit volt-age
X210
1 ANA_GND A_GND XGS analog ground X209
1 I_load I_load XGS Oscillating current. 1 V = 50 A X5
1 UT_nom UT_nom XGS Nominal tube voltage X204
1 ANA_GND A_GND XGS analog ground X206
1 USTI USTI XGS Set value for kV regulator
(cur-rent regulator circuit) 0 .... 5 V
X203
1 Upre_con Upre XGS Set value for kV regulator (pre-liminary control) 0 ... 5 V
X201
1 ANA_GND A_GND XGS analog ground X200
Item signal name short name valid at
description
mea-suring point
D702 IT_act IT_act XGR actual tube current
max. 80 mA -> 1 V = 100 mA <80 mA -> 1 V = 80 mA
X18
D702 IF_act_1 IF_act_1 XGR actual filament heating 1 1 V = 0.273 A
X19
D702 IF_act_2 IF_act_2 XGR actual filament heating 2 1 V = 0.273 A
Tab. 22 D702 RAC measuring points
D732 HV acquisition
HVT (high voltage tank) measuring points Tab. 23 D732 HVT measuring points
D702 IF_act_3 IF_act_3 XGR actual filament heating 3 1 V = 0.273 A
X21
D702 ANA_GND A_GND XGR analog ground X17
board signal name short name valid at
description
mea- sur-ing point D702 Test_DAC_1 DAC_1 XGS FPGA controlled debug DAC X10 D702 Test_DAC_2 DAC_2 XGS FPGA controlled debug DAC X11
D702 Res_sin sin XGS Resolver Sine Signal X12
D702 Res_cos cos XGS Resolver Cosine Signal X13
D702 RAC_P3 P3 XGS RAC Strom Phase 3(1 V = 40
A, Offset 2.5 V)
X14
D702 RAC_P2 P2 XGS RAC Strom Phase 3(1 V = 40
A, Offset 2.5 V)
X15
D702 RAC_P1 P1 XGS RAC Strom Phase 3 (1 V = 40
A, Offset 2.5 V)
X16
D702 ANA_GND ANA_GND XGS analog ground X17
Item signal name short name valid at
description
mea-suring point
D732 ANA_GND ANA_GND XGR analog ground X12
D732 P_UT_act P_UT_act XGR Tube voltage (pos.) (1 V = 10 kV)
X13
D732 N_UT_act N_UT_act XGR Tube voltage (neg.) (1 V = 10 kV)
X14 Item signal name short name valid
at
description
mea-suring point
LED´s on D700, D701, D702, D703
0 D700 LED statusFig. 27: D700 measuring points and LED status
Tab. 24 D700 main board
board signal name valid at description LEDs D700 S_FIL_INV XGR Start FIL Inverter. Only used in XGR. V7 D700 S_RAC_INV XGR Start RAC Inverter. Only used in XGR. V8 D700 S_HV_INV XGR/XGS Start HV Inverter (at XGR signal
delayed due to transport (fastlink) delay. V9
D700 Cycle LED XGR/XGS FPGA Life Cycle LED V10
D700 XC XGR/XGS XC Signal from system V11
D700 XRAY_On XGR/XGS XRAY On Signal (UT_act > 20 kV) V12
D700 INV_Err XGS Inverter Error V13
D700 FPGA_Err XGR/XGS Error Interrupt from FPGA V14
D700 MB 1000 mA XGR IT_act measurement range 1000 mA V15 D700 MB 100 mA XGR IT_act measurement range 100 mA
(amplification *10)
V16
D700 MB 25 mA XGR IT_act measurement range 25 mA (amplification *40)
V17
D701 HVC board
Tab. 25 D701 main board
D702 FIL/RAC
Tab. 26 D702 main board
D700 STOP XGR/XGS Stop Report Loop V20
D700 UT_MAX XGR UT_act max. monitoring V21
D700 A XGR/XGS System A on System B off V23
D700 rot XGR/XGS rotating on, stationary off V24
board signal name valid at description LEDs
D701 LED 1 n.a not used V205
D701 LED 2 n.a not used V206
D701 LED 3 n.a not used V207
D701 LED 4 n.a HVC Error Interrupt V208
board signal name valid at description LEDs
D702 n.a XGR FPGA out LED 0lim_1: Lim regulator
FIL_1 active
LED_0
D702 n.a XGR FPGA out LED 1 20peak_1: Peak
regu-lator FIL_1 active
LED_1
D702 n.a XGR FPGA out LED 2 20STOP_FIL/
STOP_RAC.
LED_2
D702 n.a XGR FPGA out LED 3 20RAC_State_0. LED_3
D702 n.a XGR FPGA out LED 4 20RAC_State_1 LED_4
D702 n.a XGR FPGA out LED 5 20HALL_A LED_5
D702 n.a XGR FPGA out LED 6 20HALL_B LED_6
D702 n.a XGR FPGA out LED 7 20FIL_Error_Int /
RAC_Error_Int
LED_7 board signal name valid at description LEDs
D703 XG board
Tab. 27 D703 main board
D704 dongle board
Tab. 28 D704 dongle board
D790 PDC board
Fig. 28: D790 signal LEDs
Item signal name valid at description LEDs
D703 LinkErr XGS/XGR Link Error LED[5]
D703 LightErr XGS/XGR Light Error LED[4]
D703 CfgErr XGS/XGR Config Error (FPGA not programmed) LED[3]
D703 DefCfg XGR xray_and_not_door (XGR) LED[2]
D703 RunCfg XGS door closed (XGS) LED[1]
D703 Prg XGR door closed (XGR via Fastlink) LED[0]
D703 LED 1 XGS XGS_off (XGS indication when starting inverter)
LED[6]
D703 LED 2 XGS/XGR LifeCycle (flashes if FPGA is loaded) LED[7]
board signal name valid at description LEDs
D704 VCC XGS/XGR Power supply 5 V V1
Tab. 29 D790 PDC board LEDs
board signal name valid at description LEDs D790 P_24V_SNT XGS P_24V from switched power supply
(only used for relays, feedback, and fans)
V1
D790 VCC_SNT XGS VCC (5 V) from switched power supply V2
D790 VCC3.3 XGS FPGA IO voltage (3.3 V) V3
D790 LED morse XGS FPGA Lifecycle LED (if LED flashes -> FPGA is loaded and is functioning)
V4
D790 P_15V_SNT XGS P_15V from switched power supply V5
D790 VCC_INT XGS FPGA core voltage (1.5 V) V6
D790 N_15V_SNT XGS N_15V from switched power supply V7
D790 P_15V_SNT
_AUX
XGS P_15V from switched power supply for inverter und fans.
Fig. 29: D790 PDC board signal LEDs
Tab. 30 D790 PDC board LEDs
board signal name valid at description LEDs
D790 Main_Sw XGS PDC Main Switch Breaker Signal V105
D790 Cooling_CB XGS Cooling Unit Breaker Signal V117
D790 XGS XGS XGS Breaker Signal V116
D790 PHS_CB XGS PHS Circuit Breaker Signal V138
D790 Gan_Stat XGS Gantry Stationary Breaker Signal V144
D790 Gan_Rot XGS Gantry Rotating Breaker Signal V143
D790 UPS XGS UPS Breaker Signal V157
Tab. 31 D790 PDC board LEDs
board signal name valid at description LEDs
D790 Cooling XGS Cooling Unit Signal V106
D790 PHS XGS PHS Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V118
D790 L2_Perm_Ga ntry
XGS L2 Gantry Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V119
D790 Charg_XGR XGS Charging XGR Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V139
D790 PWR_XGR XGS Power XGR Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V145
D790 IRS XGS IRS Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V146
D790 ICS_Ether XGS ICS Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V160
D790 Charg_XGS XGS Charging XGS Signal
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
Tab. 32 D790 PDC board LEDs
board signal name valid at description LEDs
D790 PWR_XGS XGS Power XGS
LED off -> trigger and feedback off; LED on -> trigger and feedback on; LED flashing -> trigger and feedback differ-ent
V107
D790 Temp_Trans XGS Temp Transformer Signal V120
D790 Power_CTRL XGS Power Control Signal V121
D790 Diff_Sw XGS Diff Switch Signal V140
D790 Volt_Prot XGS Voltage Protection Signal V147
D790 Current Loop XGS Current Loop Signal V148
D790 Door XGS Door Switch Signal
LED On: Door open (in PDC_B always on)
V162
D790 Fan Mode XGS Fan Mode
LED On: low noise mode (15 V)
3-3DMS
General
0Safety
0WARNING [ hz_serdoc_F13G01U12M03 ]
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”.
NOTE Follow ESD guidelines when handling the DMS.
Notes
0There are 2 Types of DMS:
TACH- DMS and AMS DMS. Please check SPC for partnumbers, some spare parts are specific for one or the other type.
Most noticeable are the colours of the handles of the modules: TACH modules have a grey handle, AMS modules have a pink handle.
1. Before starting troubleshooting, be sure you troubleshoot the right area.
- To distinguish between the DMS’s and IRS, use the Datalink Test and check the data path first
- To distinguish between DMS A and DMS B, run the DMS tests and check if the errors are related to DMS A or DMS B.
- To distinguish between DMS A and DMS B, especially if image quality problems appear in Dual source modes, it is useful to have a 30 cm water phantom (Service Tool, also used for IEC Acceptance).
- To distinguish between module and backplane, it is possible to cross the module cable at the backplane.
If the error moves when crossing the module cables at the backplane, the problem is related to the module or module cable.
- To distinguish between module and module cable, it is possible to swap the whole module cable with a neighboring one.
If the error moves when swapping the whole cable, the problem is related to the mod-ule cable.
NOTE A second peak may appear in the displayed plot with module cables crossed or swapped. This is normal if no new calibra-tion (e.g. a new Checkup or Setup/Calibracalibra-tion) has been
per-2. If possible, use the test modes with rotation for troubleshooting especially in case of noise problems.
NOTE Use rotation modes with the collimations shown below and close all DMS covers before starting rotation.
The two most useful slice combinations for troubleshooting are: - 32 x 0.6 mm
- 24 x 1.2 mm
Definitions and abbreviations
0n.a.
Prerequisites
01. Check (Environmental Conditions / p. 96) (especially in case of weak rings) 2. Check for objects in the scan field e.g. contrast agent, labels,...
3. Try to reproduce an image the customer has complained about using the same param-eters
4. Use (ROI/Ring / p. 69) and note the positions as a reference for the position expected to contain the defect (two positions are possible).
TSG Image Quality
3.1 This chapter provides a basic overview of different types of image quality problems and a useful way for starting troubleshooting.General
0NOTE Important! There is almost no cooling of the DMS electronics if the metal DMS cover is removed. If the DMS plastic cover remains installed, there is a risk of overheating. Always switch the gantry “off” completely prior to opening and work-ing at the DMS, to prevent damagwork-ing parts.
NOTE Most of the image quality problems are related to defective channels within a detector module. That is why troubleshoot-ing should start with defective channel detection. This chap-ter is sorted for different types of image quality problems and should guide you. The DMS tests are described later in this chapter.
Possible reasons for ring and band (mostly 4, 8, or 16 channels) artifacts are:
•
Defective detector element•
Defective detector cable•
Defective backplane•
Insufficient calibration (e.g. contrast agent at plexiglas ring)•
Insufficient tune-up tables•
Problem with balancing (reconstruction)•
Insufficient environmental conditions•
Defective IRS•
Bands covering 16 channels might be caused by the incorrect Z-position of one mod-ule. Run Z-position check of modmod-ule.NOTE Problems related to a single slice appear as permanent rings in sequence modes, and as partial rings in spiral scans.
Possible reasons for streak artifacts are:
•
Defective detector module•
Patched channels•
Tube arcingPossible reasons for other artifacts, e.g. pattern in image, inhomogeneous areas are:
•
The tube•
The tube-side collimator•
UHR comb (not supported by VA10)•
The tube cooling system•
The DMS power supplyNOTE If the DMS covers and parts have to be removed during trou-bleshooting, follow the instructions in the “Replacement of Parts” section for detailed informations how to remove and install DMS parts. Cooling is reduced when the DMS covers are removed. Never start gantry rotation with the DMS covers removed. Close the DMS covers before switching on the gan-try and starting the tests.
TSG strong rings
0In most cases we suspect that the detector module is defective.
Strong bands (4, 8, or 16 channels) may also result from a defective backplane or DAS Controller.
NOTE Offset/noise values of an entire backplane that are out of tol-erance indicate a defective DAS Controller in most cases.
Tests which typically show problems in case of strong rings are:
•
Offset value•
Signal value•
SinogramStart troubleshooting as follows:
Tab. 33 TSG
Step Action
1
•
Use (ROI/Ring / p. 69) to determine the area of the defect in the customer image2
