P/N 9-500-0255 6-17
Service Manual
Chapter 6: Maintenance—Remove and Replace Procedures
Gantry Components—Remove and Replace
2.5 Right-Side Gantry Components
Refer to Figure 6-1: Gantry Components, for location of right-side gantry components
throughout the following subsections.
2.5.1 Host Microprocessor Board
The Host Microprocessor Board is positioned near the center of the right side Gantry
frame. The Microprocessor houses the Affinity Series program firmware chip (U29).
To replace the firmware chip (U29) refer to Section 2.5.2.
Caution:
Always observe Electrostatic Discharge (ESD) precautions when working
with electronics and electronic components.
1. Before replacing the Microprocessor Board, or the calibration data storage bat-
tery, record all of the system defaults on the Default Worksheet (see Operator’s
Manual for User and Exposure Default Worksheets) and download the calibra-
tion data as per Chapter 5, Section 3.3.2.
2. Remove power to unit and access the Microprocessor Board by removing the
right side Gantry cover as per Section 2.1.1.
Notes… If it is only necessary to replace the calibration storage battery, skip to step 7
now.
If it is only necessary to replace the firmware chip (U29), skip to step 8 now.
3. Remove all of the wire harness connectors from their jacks at AJ2, AJ3, AJ5, AJ6,
AJ8, AJ11, AJ13, AJ14, AJ16, AJ20, AJ27, AJ28, AJ29, AJ31 and AJ32.
4. Remove the data ribbon cables from their connectors at AJ12, AJ22, AJ23 and
AJ25.
5. Lift the board off of the 7 “squeeze” type standoffs.
6. Reverse Steps 2 through 5 to replace the Microprocessor Board. Skip to Step 9.
7. If the calibration data storage battery is being replaced, follow the
manufacturer’s instructions for replacing the battery. Skip to Step 9.
8. Replace the firmware chip (U29) as per Section 2.5.2, then go to Step 9.
9. Turn power on to unit, and upload the calibration data as per Chapter 5, Section
3.3.3.
10. Perform the following setup and calibration procedures before releasing the unit
to the user:
• Chapter 3, Section 4.0, Setting User Defaults
• Chapter 4, Section 4.1, Tube Voltage Calibration
• Chapter 4, Section 4.3, Filament Current (mA) Calibration
• Chapter 4, Section 5.3, Initial Calibration—Large Focal Spot (Mo)
• Chapter 4, Section 3.1, Compression Force Calibration
• Chapter 4, Section 3.2, Compression Thickness Calibration
• Chapter 4, Section 9.1, kV Control Offset Calibration
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