Hologic QDR 4500 - C-Arm y Encoder; Control Panel and Table y Frus

QDR

4500 Technical Manual
5-4
9. Install the belt on both pulleys.
10. At the encoder end of the belt, install the tension spring and tensioning nut.
11. Tighten the tension nut so that the spring compresses to 7/8 inch. The bracket cutout can
be used as a measuring guide (the inside of the washer should be flush with the bracket
cut).
12. Tighten the two mounting bolts holding the tension block.
13. Restore the cable shield and ground strap terminations.
14. Perform the MOTOR$AY calibration procedure.
C-Arm Y Encoder
To remove and replace the Encoder refer to Figure 5-1 and follow the procedure below:
1. Before removing power from the QDR 4500, remove both cable covers, unhook the
center cable hold-down clip and free the encoder cable as much as possible without
unplugging it.
2. Move the C-arm towards the center of the Scanner (so the encoder is accessible).
3. Turn off the QDR 4500 instrument power, computer power, and main circuit breaker.
4. Unplug the encoder from the Motor Controller Board and pull out the cable.
5. Remove the hose clamp fastener holding the encoder to the belt drive.
6. Remove the encoder from the bracket assembly.
7. Replace the encoder on the bracket, install the tubing but do not attach the clamp.
8. Perform the MOTOR$AY calibration procedure.
Note:
When starting this procedure, make sure the encoder
is not
clamped to the drive shaft
tubing.
CONTROL PANEL AND TABLE Y FRUS
Note:
Table Y operations apply to models A and W only.
This section describes how to remove and replace the FRUs associated with the Control Panel
and Table Y motion of the QDR 4500 (see Figure 5-1 and Figure 5-3).
1. Before removing power from the QDR 4500, move the table to the far left using the
Motor Control Pad. The Motor Control Pad can be accessed from the Main Menu by
choosing
Utility
, followed by
emergency Motion
.
2. Turn off the QDR 4500.
3. Remove 2 screws from the right table rail end cover, and slide the cover off from the
end.