Hologic DISCOVERY A, Technical Manual

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Discovery QDR Series Technical Manual
5-14
12. Remove the end plates from the old pedestal and install on the new pedestal
being careful to maintain their orientation (6mm Allen screws). Apply a small
amount of Loctite when installing the screws.
13. Replace the pedestal and install the pedestal lower bolts, but leave them loose for
now.
14. Replace the power plug.
15. On the TZ Motor Controller board, set the Direction switch to Up.
16. Press the appropriate pedestal switch on the TZ Motor Controller board to raise
the pedestal until it just touches the T-rail.
17. Install the cosmetic bracket and upper pedestal bolts leaving the bolts loose for
now.
18. Using the switches on the TZ Motor Controller board, raise both pedestals and
remove the 2 x 4s and foam.
19. Measure from the inside of one T-rail to the inside of the other. It must be 65
inches at both the front and back. If it is not, move the pedestal until the measure-
ments are correct.
20. Tighten the lower and upper pedestal bolts.
21. On the TZ Motor Controller board, set the Direction switch to Down.
22. Using the switches on the TZ Motor Controller board, lower both pedestals all
the way down.
23. On the TZ Motor Controller board, set the Service switch to Normal and press
Reset (large black button).
24. Login as Service and perform the MOTOR$TZ calibration by selecting
Utili-
ties|Service Utilities|SQDRIVER
from the Discovery Main Menu screen
(you must be in Service Mode). At the CARM$$$> prompt, type
MOTOR$TZ
<Enter>
Refer to the MOTOR$TZ calibration procedure on page 3-33 for details.
25. After the calibration process completes, replace all covers.
5.5.2 The Linear Rotary String (Encoder)
5.5.2.1 Installation
When replacing one of these encoders, make certain you have the correct part.
Refer to Figure 5-5 and Figure 5-6 and follow the procedure below:
Part Number
Right Encoder 030-2417
Left Encoder 030-2867