Gas Spring; Lower C-Arm Frus; C-Arm Interface Board; X-Ray Controller Assembly - Hologic QDR 4500 Technical Manual

Note: When starting the MOTOR$AR calibration procedure, make sure the encoder is not
clamped to the drive shaft tubing.

Gas Spring

It is not necessary to remove any covers to remove and replace either Gas Spring. Refer to Figure
5-7 (right Gas Spring), or Figure 5-9 (left Gas Spring), and follow the procedure below:
From DOS type TOLAT, then press the Enable Motion switch, on the Control Panel, to get to the
lateral position.
1. Remove the retaining clip from the top of the gas spring, and remove the spring from the
stud.
2. Remove the nut that holds the lower stud in place and take the stud and spring out
together.
3. Prior to installing the new spring, lubricate the ball studs at both ends with white lithium
grease.
4. Put the lower stud on the new spring and attach.
5. Install the top of the spring to the top stud, and replace the retaining clip.

LOWER C-ARM FRUS

This section describes how to remove and replace the C-arm Interface Board, X-Ray Controller
(XRC), Tank and Filter Drum Assemblies located on the lower C-arm (see Figure 5-9).

C-Arm Interface Board

To remove and replace the C-Arm Interface Board refer to Figure 5-9 and follow the procedure
below:
1. With the C-arm in the AP position, use the Motor Control Pad to move the table out as
far as it will go, for easier access.
2. Turn off the QDR 4500 computer and instrument power switches, and main power
circuit breaker.
3. Remove the rear tank cover (covers the C-arm Interface board).
4. Unplug all cables to the C-Arm Interface Board.
5. Remove 4 Phillips screws and remove the board.
6. To replace the C-Arm Interface Board reverse the steps.
7. Perform the Test Scan Modes procedure in the Installation section of this manual.

X-Ray Controller Assembly

To remove and replace the X-Ray Controller (XRC) refer to Figure 5-9 and follow the procedure
below:
5-18
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QDR 4500 Technical Manual