19. Starting with the Check Tube kV Peak Potential procedure in the Installation section of
this manual, perform all the procedure in that section in order, with the exception of the
Calibrate Motors and Check Laser Positioning Offset procedures.
UPPER C-ARM FRUS
This section describes how to remove and replace the Integrator/Multiplexor Board, Detector
Boards and Laser Assembly located on the upper C-arm (Figure 5-11).
Integrator/Multiplexor Board
To remove and replace the Integrator/Multiplexor (Mux) Board refer to Figure 5-11 and follow
the procedure below:
1. Turn off the QDR 4500 computer and instrument power switches, and main power
circuit breaker.
2. Remove the top C-arm cover.
3. Remove the three cables at the Mux board.
4. Remove the two screws holding down the back of the detector assembly, and also
remove the ground wire.
5. Remove the detector assembly cover.
6. Remove the 6 Phillips screws holding the detector assembly to the box, and remove the
entire detector assembly from the box.
Note: Place the assembly on something soft (such as the table pad) so as not to damage the
detectors.
7. With the Mux board facing up, remove the 12 Phillips screws holding the Mux board to
the center metal plate.
8. Gently remove the Mux board from the center metal plate (can be done by prying gently
and evenly around all sides with a large flat blade screwdriver).
9. To replace the Integrator/Multiplexor Board reverse the steps.
10. Perform the A/D Gain Control Adjustment in the Alignment and Calibration section of
this manual.
11. Perform Beam Flattening in the Alignment and Calibration section of this manual.
Section 5 - Remove & Replace
5-23
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