Hologic QDR 4500 - Page 221

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Section 6 - Fault Isolation

6-43

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Main Page

Table of Contents4
Section 1 Introduction11
System Overview11
X-Ray Scanning Theory12
Figure 1-1. QDR 450012
Figure 1-2. Q Scan Plot13
Functional Overview14
Figure 1-3. QDR 4500 Block Diagram (Operator's Console)14
Figure 1-4. QDR 4500 Block Diagram (Scanner Unit)15
Figure 1-5. QDR 4500 Block Diagram (C-Arm Subsystem)16
Product Specifications18
BMD Precision20
Duty Cycle20
Leakage Technique Factors20
Minimum Beam Filtration20
Measured Half Value Layer (HVL) at Different Operating Potentials21
Line Voltage and Maximum Line Current21
Technique Factors for Maximum Line Current21
Maximum Deviation21
Measurement Criteria for Technique Factors21
Section 2 Functional Description23
Computer23
Communications Controller Board23
Interface Connections23
Distribution Board25
Power25
Figure 2-1. Communications Controller Board/Distribution Board Interconnection Diagram25
Interface Connections26
Figure 2-2. Distribution Board High Level Interconnection Diagram26
Motor Controller Board27
Power27
Interface Connections28
Figure 2-3. Distribution Board/Motor Controller Board Interconnection Diagram28
Tz Drive Board29
Service Switches29
Power30
Interface Connections30
Figure 2-4. Distribution Board/Tz Drive Board Interconnection Diagram31
Control Panel Controller Board33
Power33
Interface Connections34
Figure 2-5. Control Panel Controller Interconnection Diagram34
C-Arm Interface Board37
Continuity Daisy Chain37
Power37
Interface Connections38
Figure 2-6. Distribution Board/C-Arm Interface Board Interconnection Diagram38
X-Ray Controller Assembly40
Interface40
Figure 2-7. C-Arm Interface Board High Level Interconnection Diagram40
Figure 2-8. C-Arm Interface Board/X-Ray Controller Assembly Interconnection Diagram41
X-Ray Controller Assembly Boards42
I/O and Logic Board42
Low Voltage Power Supply42
Power Factor Regulator (PFR) Substitution Board43
Duty Cycle Regulator43
H-Bridge Board43
Interface Connections43
Figure 2-9. X-Ray Controller Assembly High-Level Interconnection Diagram43
Figure 2-10. Low Voltage Power Supply Board Interconnections44
Figure 2-11. PFR Substitution Board/I/O and Logic Board Interconnection Diagram46
Figure 2-12. I/O and Logic Board/H-Bridge Board Interconnection Diagram46
Figure 2-13. I/O and Logic Board/Duty Cycle Driver Board Interconnection Diagram47
Figure 2-14. H-Bridge Board/Duty Cycle Driver Board Interconnection Diagram47
X-Ray Source Unit48
Data Acquisition System48
Solid State Detector49
Power49
Interface Connections49
Integrator/Multiplexor Board50
Power51
Interface Connections51
Figure 2-16. Analog Digital Converter Board/Integrator Multiplexor Board Interconnection Diagram51
Analog to Digital Board52
Power53
Interface Connections53
Power Module54
Figure 2-18. Power Module Block Diagram55
Section 3 Installation57
Required Tools57
Required Documentation57
Room and Doorway Size58
Figure 3-1. Room Layout (4500A)58
Figure 3-2. System Dimensions (4500SL)59
Figure 3-3. System Dimensions (4500W)59
Arrange for Help60
Inspect for Visible Shipping Damage60
Figure 3-4. System Dimensions (4500C)60
Uncrate Unit61
Figure 3-5. Crated Unit (QDR 4500A and QDR 4500SL)61
Inspect for Hidden Shipping Damage62
Take Inventory62
Measure Path to Final Destination62
Short Doorway62
Narrow Hallway63
Remove Table Top (if Necessary)63
Figure 3-6. Uncrated Unit (QDR 4500A and QDR 4500 SL)63
Remove Qdr 4500A, or Sl, C-Arm (if Necessary)64
Figure 3-7. Table X Drive64
Figure 3-8. Tipping Unit65
PREPARING the TABLE TOP for MOVING (SL Only)66
Move Unit to Destination (Vertical Position)66
Move Unit to Destination (Horizontal Position)67
Figure 3-9. Moving and Tilting the Unit down67
Figure 3-10. Auxiliary Horizontal Caster Installation68
Set up Unit69
Figure 3-11. Shipping Bracket Locations (QDR 4500A and SL)69
Figure 3-12. Shipping Bracket Locations (QDR 4500A and SL)70
Figure 3-13. Shipping Bracket Locations (QDR 4500W and C)70
Install Qdr 4500A, or Qdr 4500Sl, Upper C-Arm71
Figure 3-14. Shipping Bracket Location (QDR 4500W and C)71
Install Qdr 4500W, or Qdr 4500C, C-Arm72
Figure 3-15. Repositioning the Belt Tensioning Mechanism72
Install Computer73
Install Cables73
Figure 3-16. Isolation Transformer Taps73
Safety Precautions74
Check Power Line Voltage74
Measure Line Voltage74
Measure Isolation Transformer Secondary Voltage74
Check Tube Kv Peak Potential75
Check Tube Current77
Check Belt Tension79
Adjust C-Arm y Belt79
Calibrate Motors79
Check X-Ray Beam Alignment79
Calibrate Aperture (Qdr 4500A and Sl)79
Check Laser Positioning Offset80
Adjust A/D Gain Control80
Perform Beam Flattening80
Perform Lateral Alignment Test80
Measure X-Ray Dose to Patient80
Check Hvps/S (Tank) for Radiation Leakage81
Figure 3-21. Leakage Test Shield (099-0566)81
Calibrate for Area, Bmd and Bmc82
Test Scan Modes82
Finish Assembling Unit82
Measure X-Ray Scatter from Phantom83
Perform Qc83
Run Reproducibility Test83
The Radiation Measurement Report85
Section 4 Alignment and Calibration87
Checking Table Alignment87
Aligning Table87
Figure 4-1. Table Alignment88
Front to Back T-Rail and Table Edge/Rail Gap Adjustment89
C-ARM PARALLELISM ADJUSTMENT (a and SL Only)89
Figure 4-2. Pedestal (Covers Removed)89
X-RAY BEAM ALIGNMENT (a and SL Only)90
Figure 4-3. X-Ray Alignment Fixture (010-0923)90
Figure 4-4. Inserting the X-Ray Alignment Fixture91
Figure 4-5. the Alignment Fixture Properly Installed92
Figure 4-6. Filter Drum Adjustments - Top View92
Figure 4-7. Array Assembly - Top View, Partial93
X-RAY BEAM ALIGNMENT (C and W Only)94
APERTURE CALIBRATION (a and SL Only)95
Motor Calibration95
MOTOR$TZ (QDR 4500A and SL)96
MOTOR$AY (All QDR 4500 Models)98
MOTOR$TY (QDR 4500A and W)102
MOTOR$TX (All QDR 4500 Models)105
MOTOR$AR (QDR 4500A and SL)108
Laser Positioning Offset Adjustment113
A/D Gain Control Adjustment113
Beam Flattening114
X-Ray Beam Alignment "Airscan" Test116
Machines Using Body Composition Analysis (BCA)117
Machines Using BMD Whole Body Analysis117
Lateral Alignment Test (Qdr 4500A and Sl)117
Area, Bmd and Bmc Calibration119
Scan Thickness Measurement & Calibration (QDR 4500A and SL)119
Scan Thickness Measurement & Calibration (QDR 4500W and C)122
Calibration of Area and BMC, for Array Scan Modes124
Adding Array AP Scans to the QC Database125
Section 5 Remove and Replace Procedures131
Recommended Tools131
Electronics Tray Frus131
Electronics Tray Printed Circuit Boards131
C-Arm y Belt132
C-Arm y Motor or Gearcase133
Figure 5-1. Electronics Tray Frus133
C-Arm y Encoder134
Control Panel and Table y Frus134
Control Panel135
Pcbs under Right-Side of the Table135
Figure 5-2. Control Panel and Table y Frus135
Figure 5-3. Left Side Table y Frus137
Figure 5-4. Table X Frus139
Pedestal141
Figure 5-5. Table Z Frus142
Linear Potentiometer (Encoder- Obsolete)143
The Linear Rotary String (Encoder)143
Installation143
Figure 5-6. Installing the Rotary String Encoder144
Arm R Frus145
Motor Controller Board145
Figure 5-7 C-Arm R Frus (Outside View)145
Arm R Belt146
Arm R Motor, Gearcase, Encoder or Encoder Belt146
Figure 5-8. C-Arm R Frus (Inside View)147
Gas Spring148
Lower C-Arm Frus148
C-Arm Interface Board148
X-Ray Controller Assembly148
Filter Drum Assembly150
Figure 5-9. Lower C-Arm Frus150
Tank Assembly151
Figure 5-10. Top View of Tank152
Upper C-Arm Frus153
Integrator/Multiplexor Board153
Detector Boards154
Figure 5-11. Upper C-Arm Frus154
Laser Assembly155
Figure 5-12. Detector Assembly Mounting155
Rear C-Arm Frus156
Analog to Digital Converter Board156
Figure 5-13. Laser Assembly156
Power Module Frus157
28 Volt Power Supply157
Figure 5-14. Rear C-Arm Frus157
Figure 5-15. Power Module Frus158
Line Filter159
Isolation Transformer159
Power Controller Board159
Operator's Console Frus160
Figure 5-16. Power Control Panel Frus160
Figure 5-17. Operator's Console Assemblies161
Aperture Assembly Frus162
Aperture Stepper Motor162
Figure 5-18. Computer Assemblies162
Aperture Motor PCB163
Aperture Position Belt163
Figure 5-19. Aperture Assembly Frus (QDR 4500A and SL)163
Rotary Potentiometer164
Drum Assembly Frus164
Drum Encoder PCB164
Drum Belts165
Figure 5-20. Aperture Assembly Removal (QDR 4500A and SL)165
Stepper Motor Assembly166
Figure 5-21. Rear Drum Assembly Frus166
Drum Bearings167
Figure 5-22. Front Drum Assembly Frus167
Figure 5-23. Drum Outer Bearings168
Replacing Emi Cables169
Figure 5-24. Drum Inner Bearings169
Figure 5-25. the EMI Compliance Cable170
Fru Lists171
Cables177
Miscellaneous177
Mobile178
Special Tools178
Section 6 Fault Isolation179
Before Starting179
Software Configuration179
Hardware Configuration179
Power Problems179
Motion Problems180
Figure 6-1. Scanner Motion Directions181
Control Panel Problems183
Display Problems183
Vertical Stripe184
Horizontal Stripe184
Noise184
No Display185
Targeting/Laser Problems186
Data Communications Problems186
Area /Bmd/Bmc/CV Specification Problems187
X-Ray Problems187
No X-Rays187
X-Ray Alignment Problems188
Figure 6-2. Checking C-Arm Parallelism188
Beam Flattening Problems189
Laser Problems190
Oil Leakage191
The Torque Specifications191
Tank Top Cover Components and Screw Location191
Figure 6-3 Tank Assembly Top View191
Tightening the Lexan Cup Screws192
Tightening the Bladder Gasket Screws192
Tightening the Transformer Seal Screws192
Figure 6-4 Lexan Cup Screw Tightening Order192
Figure 6-5. Bladder Gasket Screws192
Tightening the Tank Cover Gasket Screws193
Figure 6-6. Transformer Screws193
Miscellaneous Problems194
Messages194
Figure 6-7. Tank Cover Gasket194
No A/C Line Interrupts195
Error Message List197
Section 7 Preventive Maintenance227
Customer Preventive Maintenance227
Field Service Preventive Maintenance227
Guide Rail and Bearing Maintenance228
Figure 7-1. Guide Bearing and Rail229
Section 8 Pcb Summary Information231
Power Distribution231
Adc231
Signal Distribution232
Communications Controller232
Detector Array Assembly233
TZ Drive233
Stepper Motor Controller234
Control Panel Controller234
Section 9 Software Tools237
Susq237
Figure 9-1. SUSQ Screen−X-Rays off238
Figure 9-2. SUSQ Screen−X-Rays on238
Figure 9-3. SUSQ Screen Settings239
Sqkeypad240
Appendix Asoftware Deinstallation/Installation241
Appendix Bcross-Calibration243

Hologic QDR 4500 - Page 221

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