Hologic QDR 4500 - Page 140

QDR

4500 Technical Manual
5-10
10. Perform the MOTOR$TX calibration procedure.
Note:
When starting the MOTOR$TX calibration procedure, make sure the encoder
is not
clamped to the drive shaft tubing.
Table X Motor or Gearcase
To remove and replace the Table X Motor or Gearcase refer to Figure 5-4 and follow the
procedure below:
1. Remove the Table X Belt as described above.
2. Remove 5 flat head Phillips screws from the upper pedestal cover and remove the cover.
3. Unplug the motor cable from the Motor Controller Board.
4. Remove the four Allen bolts, and nuts, holding the motor and gearcase.
5. Remove the motor and the gearcase.
6. If replacing the gearcase, install the pulley from the old gearcase on the new gearcase.
7. Replace the motor and gear case assembly making sure to align the gasket correctly.
Snug the Allen bolts but don’t over tighten.
8. Install the belt on both pulleys.
9. At the encoder end of the belt, install the tension spring and tensioning nut.
10. Tighten the tension nut so that the spring is compressed to 7/8”. The bracket cutout can
be used as a measuring guide (the inside of the washer should be flush with the bracket
cut).
11. Tighten the two mounting bolts holding the tension block.
12. Restore the cable shield and ground strap terminations.
13. Perform the MOTOR$TX calibration procedure.
Note:
When starting the MOTOR$TX calibration procedure, make sure the encoder
is not
clamped to the drive shaft tubing
Table X Encoder
To remove and replace the Table X Encoder located within the X Table Drive Assembly, refer to
Figure 5-4 and follow the procedure below:
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 instrument power, computer power, and main circuit breaker.
3. Remove 2 screws from the right table rail end cover, and slide the cover off from the
end.