QDR
4500 Technical Manual
5-34
6.
Move the aperture towards the potentiometer until it stops.
7.
Tighten the belt clamping nut (do not over tighten).
8.
Move the aperture back until the motor shaft bracket screw holes line up.
9.
Install the 2 Phillips screws holding the motor shaft bracket.
Rotary Potentiometer
To remove and replace the Rotary Potentiometer (180-0267) refer to Figure 5-19 and follow the
procedure below:
1.
Remove the Aperture Position Belt (refer to the procedure above).
2.
Remove the potentiometer pulley.
3.
Remove and replace the potentiometer (face wires towards the Aperture Motor PCB).
4.
Replace the potentiometer pulley (pulley goes all the way down on the shaft).
5.
Refer to the Aperture Position Belt procedure and replace the belt.
DRUM ASSEMBLY FRUS
This section describes how to remove and replace the FRUs on the Drum Assembly.
Drum Encoder PCB
To remove and replace the Drum Encoder PCB (140-0065/0089) refer to Figure 5-19, and Figure
5-21, and follow the procedure below:
1.
Remove the Aperture Assembly by removing 4 Phillips screws that secure the assembly,
and 2 Phillips screws that secure the aperture motor mount, to the drum end plates.
2.
Unplug the PCB cable.
3.
Remove and replace the PCB (ensure that the encoder wheels are not touching the
sensors.
4.
Replace the Aperture Assembly.
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