Hologic DISCOVERY A, Technical Manual

Page: 179 / 274

Discovery QDR Series Technical Manual
5-13
Figure 5-6. Installing the Rotary String Encoder
1. Remove the Electronics Tray covers.
2. Remove 6 flat head Phillips screws from the upper pedestal cover and remove the
cover.
3. Remove 5 flat head Phillips screws from the lower pedestal cover and remove the
cover.
4. Move the C-arm towards the pedestal to be replaced, but ensure that the service
switches on the TZ Motor Controller board are accessible.
5. Place two 2 x 4s on end, on top of the tank. The 2 x 4s should be oriented front to
back, on the tank, to support the table. Place foam padding between the 2 x 4s
and the table to protect the tape safety switch.
6. Push in the Emergency Stop switch.
7. On the TZ Motor Controller board, set the Normal/Service switch to Service and
set the Direction switch to Down.
8. Press the left and right switches together until the table just rests on the 2 x 4s.
9. Remove the top bolts on the pedestal (9/16”). The cosmetic bracket will come
off.
Note: If removing the left pedestal, the left T-rail will become loose. Be careful
not to drop this T-rail.
10. Press the appropriate pedestal switch on the TZ Motor Controller board to lower
the pedestal completely.
11. Remove the pedestal power plug, the lower four pedestal bolts, and remove the
pedestal.