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GE HEALTHCARE

DIRECTION 2307224-100, REVISION 6DISCOVERY LS SYSTEM SERVICE MANUAL

Page 332 Chapter 12 - Troubleshooting

Figure 12-11: Cradle Drive Unit

Cradle Drive Unit

Main Page

Chapter 1 Preface33
- Default Chapter13
  - Table of Contents13
  - Direction 2307224-100, Revision Discovery Ls System Service Manual32
Scope of this Manual33
Manual Set33
Referenced Documents33
Required Skill Set and Tools34
- Training Requirements (Skill Set Required)34
  - Tools Required35
  - Direction 2307224-100, Revision Discovery Ls System Service Manual35
System Lock-Out and Tag-Out (LOTO)36
- Thermal Energy36
- Electrical Energy37
- Removing Power from the System37
  - Restoring Power to the System37
  - Figure 1-1: A1 Disconnect Panel with LOTO Applied37
- Gantry Rotation (Mechanical and Gravitational Energy)38
  - Disable Gantry Rotation38
General Safety Guidelines39
- General Safety Definitions39
Regulatory Information42
- Standard Compliance42
Chapter 2 Discovery LS System Safety Information43
CT System Safety43
Normal CT System Operational Safety43
- Potential Hazards43
- Irection Evision Iscovery Ls System Ervice Anual43
- Safety Awareness Indicators44
- Emergency Switches, Buttons and Locks45
CT Equipment Service48
- CT Gantry48
  - CT Gantry General48
- CT Mechanical Hazards54
Chemicals and Materials58
- Slip-Ring Brush Dust and Debris58
- Clean-Up and Personal Hygiene59
Table60
- Electrical Hazards60
- Mechanical Hazards61
  - Chemical Hazards61
Console (H3 or GOC1)61
- Figure 2-20: Table Touch Sensor Jumpered out61
- Figure 2-21: H3 Console On/Off Power Switch (Front Cover Removed)61
Power Distribution Units62
- Compact Power Distribution Unit (CPDU)62
- New Global Power Distribution Unit (NGPDU)64
- Mechanical Hazards66
PET System Safety66
- General66
- Laser Related Labels72
CT-PET System Safety74
- CT-PET Gantry Safety74
  - Clearance between Gantries in Service Position74
- CT-PET Table Safety76
- CT-PET Safety Labels78
Chapter 3 DLS System Functional Description79
Introduction79
CT Overview and Functionality79
- Figure 3-1: Discovery LS System79
- Pdu80
- Data Acquisition System80
PET Overview and Functionality81
- Electronic Cabinet81
- Gantry81
- Detector Ring82
- Pcu82
- Power Switch Box82
- Gantry Motion Control Board Rack82
Electrical Requirements82
Patient Table83
PET Service Access83
CT-PET LAN (Local Area Network)83
- Figure 3-2: Patient Table83
- Figure 3-3: Original CT and PET Network84
- Figure 3-4: Integrated CT and PET Networks (Option 1)85
- Figure 3-5: Integrated CT and PET Networks (Option 2)86
- LAN Connections for Systems with Turbosharc87
- Figure 3-6: LAN Connections for Systems with Turbo SHARC87
- Figure 3-7: Turbo SHARC Cabinet Selections88
E-Stop Safety89
Covers89
- Figure 3-8: RS232 PET Connection with Turbo SHARC89
- Figure 3-9: Electrical Block Diagram90
- Figure 3-10: Data Flow / Control Block Diagram91
- Figure 3-11: Grounding Diagram92
System Start-Up93
- Powering up the PET Peripherals and Subsystems94
- Figure 3-12: PDU Circuit Breaker Switches94
- Switching to the PET User Interface Display on the Scan Monitor95
- Figure 3-13: Image Monitor Screen Showing PET and Exam Rx Icons on Desktop Selection Area95
System Shut-Down96
- Shutting down the PET-CT System96
- Figure 3-14: Desktop Selection Area Showing Shut-Down Button96
- Switching off Power to PET Subsystems and Peripherals97
- Figure 3-15: CT Computer97
- Figure 3-16: PET Computer97
- Shutting down the CT and PET Applications98
- Figure 3-17: PDU Circuit Breaker Switches98
- Figure 3-18: Desktop Selection Area Showing Service Button98
- Figure 3-19: Service Desktop Showing Utilities/Tools Menu99
- Resetting CT Subsystems100
- Figure 3-20: CT Service Desktop100
- Figure 3-21: System Reset Screen100
- Rebooting PET Subsystems101
Chapter 4 Service Desktop, Tools and Diagnostics103
Service Desktop103
- Figure 4-1: Service Desktop Icon103
- Figure 4-2: Service Desktop Home Page103
- Service Desktop Main Menu104
- Figure 4-3: Utilities Area and Menu104
- Service Desktop Functionality105
- Desktop Management105
- Irection Evision Iscovery Ls System Ervice Anual105
- Figure 4-4: Systems Reset106
Chapter 5 Console107
CT-PET Console Functional Description107
- Console107
- Figure 5-1: Locations of Console Components (H2 Shown)108
- Figure 5-2: Key Console Components (H2 Shown)108
Console Connections109
- Figure 5-3: Console Block Diagram (H2 Shown)109
Chapter 6 Table111
CT-PET Table Functional Description111
- Manual Table Functional Description111
Manual Table112
- Prerequisites112
  - Furnished Materials112
  - Required Tools112
- Before Beginning113
- Pre-Mechanical Installation113
- Mechanical Installation114
- Remove the Manual Control Hardware122
- Install the Automated Base Hardware132
- Install Table Secondary Base Covers189
- Finish the Mechanical Installation208
- Figure 6-137: Attach Back Cap to Motor Base208
- Figure 6-138: ME 1.5 Table Block Diagram209
- Completion210
- Figure 6-139: Gantry Keypad210
- Direction 2307224-100, Revision Discovery Ls System Service Manual211
- Figure 6-140: Hardware Configuration Panel211
- Figure 6-141: Final PET and CT Flag Adjustment212
- Manual Table Wiring213
- Figure 6-142: Adjust PET Flag213
- Figure 6-143: 2328900-2SCH213
- Figure 6-144: 2338513SCH214
Troubleshooting Tips215
- Potentiometer Counts Differ215
- CT-PET Position Latch Solenoid Fails to Engage216
  - Symptom216
  - Probable Causes and Suggestions216
- Delta Z Not in Spec216
- Clutch Engages - Motor Does Not Spin216
- Motor Spins - Clutch Does Not Engage216
- Gantry Does Not Run System Light Tests217
  - Symptom217
  - Probable Causes and Suggestions217
Procedures and Adjustments217
Replacement Procedures217
- Replacing the Secondary Base Timing Belt217
- Figure 6-146: Front Pulley217
- Replacing the Secondary Base Front Pulley218
- Figure 6-147: Timing Belt Clamp218
- Replacing the Secondary Base Motor219
- Figure 6-148: Secondary Base Motor - General View219
- Figure 6-149: Motor - View 2219
- Figure 6-150: Motor Assembly and Coupling Removed220
- Figure 6-151: Motor Showing Groove and Set Screw220
- Replacing the Secondary Base Motor Coupling221
- Replacing the Secondary Base Motor Clutch221
- Figure 6-152: Clutch Plates221
Chapter 7 Gantry223
CT-PET Gantry Functional Description223
- Mechanical Description223
- PET Gantry Field Upgrade Modifications223
- Electrical Description226
- Direction 2307224-100, Revision 6 Discovery Ls System Service Manual226
CT Gantry Field Replaceable Units (Frus)226
CT Gantry Replacement Procedures226
PET Gantry Field Replaceable Units (Frus)226
PET Gantry Replacement Procedures227
- PET Gantry Drive Mechanism Replacement (P/N 2290248)227
- Connecting External PET Cables & New CT-PET Cables to New A36-1, A36-2, A37-1239
- Replacement of the Short Positioning Pin (P/N 2287052)240
- Figure 7-21: Replacing the Short Positioning Pin #1240
- Figure 7-22: Replacing the Short Positioning Pin #2240
Procedures and Adjustments241
- Removing the Covers for PET Gantry Service Movement241
  - Activating the Driving Mechanism241
  - Figure 7-23: Removing Covers - Illustration 1241
Chapter 8 System QC, Calibration and Functional Tests243
System QC243
- CT-PET Volumetric Calibration and Quality Control Procedure (VQC)243
Chapter 9 Planned Maintenance (PM)259
Maintenance of Mechanical Components259
- Lubrication of PET Gantry Driving Mechanism260
- Checking the Timing Belts Adjustments and Tightness261
- Figure 9-1: Greasing the Linear Bearings261
Maintenance of Cables and Connectors262
Chapter 10 Electrical Connections263
Power and Data Cables Checklist263
- CT Electronics Cabinet263
- PET Electronics Cabinet264
- Discovery LS Console265
  - Manual Table Retractor Cables266
  - Automated and Extended Table Retractor Cables267
- Secondary Base Cables268
  - Manual Table Secondary Base Cables268
  - Automated and Extended Table Secondary Base Cables268
Table268
- CT Gantry Cables269
  - CT Gantry Cables - Manual Table269
  - CT Gantry Cables - Automated and Extended Table270
PET Gantry271
- Grounding Connections272
Wiring Diagrams272
- CT Cable Connections275
- Figure 10-2: CT System with H2 Interconnect Diagram (Manual Tables)275
- Figure 10-3: CT System with GOC1 & CPDU Interconnect Diagram (Manual Tables)276
- Figure 10-4: CT System with GOC1 & NGPDU Interconnect Diagram (Manual Tables)277
- Figure 10-5: Discovery LS CT Cables (Manual Tables)278
- Figure 10-6: CT System with H2 Interconnect Diagram (Automated Tables)279
- Figure 10-7: CT System with GOC 1 & CPDU Interconnect Diagram (Automated Tables)280
- Figure 10-8: CT System with GOC1 & NGPDU Interconnect Diagram (Automated Tables)281
- Figure 10-9: Discovery LS CT Cables (Automated Tables)282
- Figure 10-10: PET System Interconnections283
- PET Cable Connections283
- Figure 10-11: PET System Power Interconnections284
E-Stop Wiring285
- Figure 10-12: PET E-Stop Wiring285
- Figure 10-13: CT E-Stop Wiring286
Chapter 11 Replacement Parts287
PET Gantry287
- Figure 11-1: Gantry Rear View287
- Figure 11-2: Base Plate and Rollers289
- Figure 11-3: Linear Bearing Assembly and Adjusters290
- Figure 11-4: Positioning Pin291
- Figure 11-5: PET Gantry Retractor Assembly (Schematic Illustration Only)292
Table294
- Secondary Base Covers294
- Figure 6-112: Secondary Base Covers294
- Figure 11-6: Secondary Base Covers294
- Secondary Base Components295
- Figure 11-7: Secondary Base Components (1)295
- Figure 11-8: Secondary Base Components (2)296
- Direction 2307224-100, Revision Discovery Ls System Service Manual297
- Figure 11-9: Secondary Base Components (3)297
- Figure 11-10: Secondary Base Components (4)298
- Irection Evision Iscovery Ls System Ervice Anual300
- Figure 11-11: Table Retractor Components301
- Secondary Base Cables302
Covers303
- Figure 11-12: Discovery LS Covers - General View303
- Cover Sections and Components304
- Figure 11-13: Gantry Covers - Front/Side View304
- Figure 11-14: Gantry Covers - Side View305
- Figure 11-15: Front View Showing Control Keys, Front Display and Breathing Lights306
- Figure 11-16: Left and Right E-Stop Buttons and Source Indicators307
- Figure 11-17: Rear E-Stop Button and Source Indicator307
Brackets for the Covers - Required Parts309
- Brackets309
- Accessories310
Assembling the Covers310
Chapter 12 Troubleshooting311
System Software Operation Issues311
Manual Table Operation Issues316
- Clutch Fails to Engage/Disengage317
- Base Axis Does Not Move318
- Figure 12-1: KB Box Driver Board Fuses318
- Base Axis Moves Constantly319
- Base Axis Moves in One Direction Only319
- Base Axis Does Not Stop at the Limit Switch and Collides with Mechanical Stopper319
- Base Axis Stops at Limit Switch, but Workstation Displays Message: Move Table to CT319
- Figure 12-2: Discovery LS - Base Axis Wiring Diagram320
- Figure 12-3: Discovery LS CT Cables321
Automated Table Operation Issues322
- Clutch Fails to Engage/Disengage322
- Figure 12-4: Clutch Driver Unit (CDU)323
- Figure 12-5: Troubleshooting for Clutch Fails to Engage/Disengage (Automated Tables)324
- Base Axis Does Not Move325
- Figure 12-6: Solenoid, Locking Mechanism and CT Position Latch325
- Figure 12-7: Secondary Base Internal Wiring Diagram326
- Figure 12-8: Troubleshooting for Base Axis Movement (Automated Tables)327
- Base Axis Movement Malfunction328
- Base Axis Does Not Stop at the PET or CT Positions328
- Digits Disappear from Gantry Display328
- Figure 12-9: Discovery LS CT Cables (Automated Tables)329
Extended Cradle Table Operation Issues330
- Clutch Fails to Engage/Disengage331
- Figure 12-10: Troubleshooting for Clutch Fails to Engage/Disengage331
- Base Axis Does Not Move333
- Figure 12-12: Troubleshooting for Base Axis Does Not Move333
- Figure 12-13: Solenoid, Locking Mechanism and CT Position Latch334
- Figure 12-14: Base Axis Schematics (Extended Cradle Table)335
- Figure 12-11: Cradle Drive Unit336
- Figure 12-15: Cradle Axis Schematics (Extended Cradle Table)336
- Base Axis Movement Malfunction337
- Base Axis Does Not Stop at the PET or CT Positions337
- Digits Disappear from Gantry Display337
CT-PET Communication Difficulties Due to NULL Modem Cable338
Appendix A339
Illustrated Parts Breakdown339
System Drawings339
- Figure A-1: Discovery LS Gantry Assembly Drawing #1339
- Figure A-2: Discovery LS Gantry Assembly Drawing #2340
- Figure A-3: Discovery LS Linear Bearing Assembly and Adjuster Assembly340
Part Lists342
- Gantry and Cables342
- Base Casting342
- Legs343
- Linear Bearings343
- Driving Mechanism345
- Cabling346
Appendix B - System Calibration Quick Guide347
Daily Calibrations348
Weekly Calibrations350
Three Monthly Calibrations355

GE Discovery LS - Page 332

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