Hologic DISCOVERY A, Technical Manual

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Discovery QDR Series Technical Manual
5-10
5.4.2 Table X Belt
To remove and replace the Table X Belt located within the X Table Drive Assembly, refer
to Figure 5-4 and follow the procedure below:
1. Before removing power from the Discovery, move the table to the far left using
the Motor Control Pad. The Motor Control Pad can be accessed from the Discov-
ery Main Menu screen by choosing
Utilities|Emergency Motion .
2. Shut down the computer and then turn off the main circuit breaker on the foot end
pedestal.
3. Remove 2 screws from the right table rail end cover, and slide the cover off from
the end.
4. Remove the front endcap from the table X drive assembly (3 Phillips screws).
5. Remove the back Phillips screw from the right side cover (of the table X drive
assembly) and slide the cover out from the front. This provides access to the belt.
6. At the encoder end of the belt, loosen the 2 bolts holding the tension block,
remove the tensioning nut, and remove and replace the belt.
7. Install the tension spring and tensioning nut.
8. Tighten the tension nut so that the spring is compressed 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).
9. Tighten the two mounting bolts holding the tension block.
10. Restore power, boot the computer and login as Service.
11. Perform the MOTOR$TX calibration procedure on page 3-40.
Note: When starting the MOTOR$TX calibration procedure, make sure the
coupling setscrew is not tightened.
5.4.3 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.