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Hologic Manuals
Medical Equipment
DISCOVERY W
Technical manual
Hologic DISCOVERY W Technical Manual
Fan beam x-ray bone densitometer
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Contents
Table of Contents
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Table of Contents
Table of Contents
Chapter 1 - INTRODUCTION
System Overview
X-Ray Scanning Principles
Functional Overview
Product Specifications
Exam Mode(S) Performance
Duty Cycle
Leakage Technique Factors
Minimum Beam Filtration
Measured Half Value Layer (HVL) at Different Operating Potentials
Line Voltage and Maximum Line Current
Technique Factors for Maximum Line Current
Maximum Deviation
Measurement Criteria for Technique Factors
Functional Description
Computer
PCI Communications Controller Board
Interface Connections
Distribution Board
Power
Interface Connections
Motor Controller Board
Power
Interface Connections
TZ Drive Board (a and SL Only)
Service Switches
Power
Interface Connections
Control Panel Controller Board
Power
Interface Connections
C-Arm Interface Board
Continuity Daisy Chain
Power
Interface Connections
X-Ray Controller Assembly (P/N 010-1273)
Interface
X-Ray Controller Board
X-Ray Source Unit
Data Acquisition System (C, W, and SL)
Solid State Detector
Integrator/Multiplexor Subsection
Analog to Digital Board
Power
Interface Connections
Data Acquisition System (a Model Only)
Solid State Detector
Power
Interface Connections
Integrator/Multiplexor Board
Power
Interface Connections
Analog to Digital Board (a Model Only)
Power
Interface Connections
Torroid Power Module and DIN Rail
Chapter 3 - INSTALLATION
Pre-Installation Requirements
Required Tools
Required Documentation
Room and Doorway Size
Arrange for Help
Uncrate and Move to Destination
Inspect for Shipping Damage
Uncrate Unit
Take Inventory
Measure Path to Final Destination
Remove Tabletop (if Necessary)
Remove Discovery a or SL Lower C-Arm Assembly (if Necessary)
Prepare the Tabletop for Moving (A, W,Wi)
Move Unit to Destination
Set up the Unit
Install the System
Install Cables
Check Power Line Voltage
Install Computer
Start QDR Software in Service Mode
Check Table Alignment
Perform C-Arm Parallelism Adjustment (a and SL Systems Only)
Calibrate and Test the System
Check Tube Kv Peak Potential
Check Tube Current
Adjust Belt Tension
Calibrate Motors
X-Ray Beam Alignment
Calibrate Aperture (Cannot be Run on CI and Wi Models)
Check Laser Positioning Offset
A/D Gain Control Adjustment
Check and Verify the A/D Gain
Adjust the A/D Gain
Perform Detector Flattening
Perform Lateral Alignment Test (a and SL)
Check HVPS/S (Tank) for Radiation Leakage
Calibrate for Area, BMD and BMC
Scan Thickness Measurement & Calibration (C and W)
Scan Thickness Measurement & Calibration (a and SL)
Calibration of Area and BMC, for Array Scan Modes
RECALYZE and Add Array AP Scans to the QC Database
Install Software Options
Test Scan Modes
Finish Assembling Unit
Measure X-Ray Dose to Patient
Measure X-Ray Scatter from Phantom
Perform QC
Run Reproducibility Test
Instruments Using Body Composition Analysis (BCA)
Instruments Using BMD Whole Body Analysis
The Radiation Measurement Report
Alignment and Calibration
Check Table Alignment
Align the Table
Front to Back T-Rail and Table Edge/Rail Gap Adjustment
C-Arm Parallelism Adjustment
X-Ray Beam Alignment
Aperture Calibration
Motor Calibration
Laser Positioning Offset Adjustment
A/D Gain Control Adjustment
Check and Verify the A/D Gain
Adjust the A/D Gain
Filter Drum Encoder Alignment
Detector Flattening
Lateral Alignment Test (QDR 4500A and SL)
Instruments Using Body Composition Analysis (BCA)
Instruments Using BMD Whole Body Analysis
Check Phantom Values
Area, BMD, and BMC Calibration
Scan Thickness Measurement & Calibration (C and W)
Scan Thickness Measurement & Calibration (a and SL)
Calibration of Area and BMC, for Array Scan Modes
RECALYZE and Add Array AP Scans to the QC Database
Remove and Replace Procedures
Recommended Tools
Electronics Tray FRUS
Electronics Tray Printed Circuit Boards
C-Arm y Motor or Gearcase
C-Arm y Encoder
Control Panel (All Models)
Pcbs under Right-Side of the Table
Pedestal
The Linear Rotary String (Encoder)
Lower C-Arm FRUS
C-Arm Interface Board
X-Ray Controller Assembly
Filter Drum Assembly
Tank Assembly
Arm R FRUS (a and SL Only)
Motor Controller Board
Arm R Belt
Arm R Motor, Gearcase, Encoder or Encoder Belt
Gas Spring
Upper C-Arm FRUS
Detector Assembly A, SL, W, C Systems
Detector Assembly C1 and Wi Systems
Laser Assembly
Analog to Digital Converter Board (a Model Only)
Aperture Assembly FRUS
Aperture Stepper Motor
Aperture Motor PCB
Aperture Position Belt
Rotary Potentiometer
Drum Assembly FRUS
Drum Encoder PCB
Drum Belts
Stepper Motor Assembly
Drum Bearings
Replacing EMI Cables
FRU Lists
Chapter 6 - FAULT ISOLATION
Before Starting
Software Configuration
Hardware Configuration
Power Problems
Motion Problems
Control Panel Problems
Display Problems
Vertical Stripe
Horizontal Stripe
Noise
No Display
Targeting/Laser Problems
Data Communications Problems
Area/Bmd/Bmc/CV Specification Problems
X-Ray Problems
No X-Rays
X-Ray Alignment Problems
X-Ray Beam Does Not Align Properly
System Fails X-Ray Beam Alignment Verification
Detector Flattening Problems
System Consistently Fails the Detector Flattening Procedure
Laser Problems
Oil Leakage
The Torque Specifications
Tank Top Cover Components and Screw Location
Tightening the Lexan Cup Screws
Tightening the Bladder Gasket Screws
Tightening the Transformer Seal Screws
Tightening the Tank Cover Gasket Screws
Miscellaneous Problems
Preventive Maintenance
Customer Preventive Maintenance
Field Service Preventive Maintenance
Guide Rail and Bearing Maintenance
Pcb Summary Information
Chapter 9 - SOFTWARE TOOLS
X-Ray Survey
Invoking X-Ray Survey
The Main Display
The Display Controls
Sqdriver
Sqverify
Sqkeypad
Appendix A - ERROR MESSAGES
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System Overview
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Product Specifications
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TECHNICAL MANUAL
Hologic, Inc.
35 Crosby Drive
Bedford, MA 01730
USA
FAN BEAM X-RAY BONE DENSITOMETER
Phone in US: 800-321-4659
Fax (Domestic): 781-280-0670
Fax (International): 781-280-0671
DISCOVERY
®
QDR
Series
Document 080-1085
Revision 008
™
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