Hologic DISCOVERY A, Technical Manual

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Discovery QDR Series Technical Manual
5-2
5.2.1 Electronics Tray Printed Circuit Boards
To remove and replace the Distribution Board, Din Rail Assembly, Low Voltage Power
Supply, TZ Drive Board (A & SL only), or AY Drive Board refer to Figure 5-1 and follow
the procedure below:
Figure 5-1. Electronic Tray FRUs
1. Move the C-arm all the way to the right.
2. Shut down the computer and then turn off the main circuit breaker on the foot end
pedestal.
3. Remove the cable covers and unplug the cables on the board to be replaced.
4. To remove the board, unscrew the Phillips screws holding the board.
Note: Some boards have standoffs and/or plastic hold-down snaps.
5. To replace the board reverse the steps.
6. Restore the motor cable shield.
Note: When replacing the AY Motor Controller board, make sure that you set
the ID switch to 7. When replacing the TZ Drive board, make sure that
you set the Normal/Service switch to the Normal position.
C-Arm Y Belt
To remove and replace the C-arm Y-Belt, refer to Figure 5-1 and follow the procedure
below:
Din Rail
Distribution Board
Motor Control Board
Stepper Motor
C-Arm Y Belt
Encoder Assy.
Power Supply
Multi-Voltage DC
Front