Hologic DISCOVERY A, Technical Manual

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Discovery QDR Series Technical Manual
5-31
5.8 Aperture Assembly FRUS
This section describes how to remove and replace the FRUs on the Aperture Assembly.
5.8.1 Aperture Stepper Motor
To remove and replace the Aperture Stepper Motor (320-0041), refer to Figure 5-16 and
follow the procedure below:
Figure 5-16. Aperture Assembly FRUs
1. Shut down the computer and then turn off the main circuit breaker on the foot end
pedestal.
2. Unplug the motor cable.
3. Remove the 2 Phillips screws from the motor shaft bracket.
4. Remove the motor mount (2 Phillips screws) and remove the motor assembly.
5. Remove the motor from the motor mount, and remove the end lock nut and flat
washer. Transfer the dampening pad to the new motor.
6. Reverse the steps above to install the new motor.
7. Turn on the Discovery power, boot the computer and login as Service.
8. Perform “Aperture Calibration ” on page 4-9.
Rotary Potentiometer
Aperture Stepper Motor
Aperture Motor PCB
Position Belt
Motor Mount
Motor Shaft Bracket
Tension Nuts
PCB Bracket
Aperture
Clamping Nut