Zeiss humphrey HFA II-i series Field Service Manual page 91

Humphrey Field Analyzer II - i
3) Disconnect the "X-MOTOR" cable (P4) from the Patient Support Interconnect
PCB. Cut any cable ties holding this cable to the Patient Support Interconnect
PCB.
4) Rotate the motor shaft to position the lead screw nut close to the X-motor
(Figure 3-10).
5) Loosen the setscrews holding the lead screw to the motor shaft.
6) Grasp the chinrest and move it away from the X-motor until the lead screw
disengages from the motor shaft.
7) Remove the four screws securing the X-motor to the bracket, and remove the
motor.
FIGURE 3-10. Disconnecting the X-Motor Lead Screw from the Motor Shaft
Replacement Notes:
Be sure to reinstall a nylon washer on the motor shaft before attaching the lead
P
screw. The lead screw should be seated on the motor shaft all the way up to the
motor body before tightening the setscrews.
Before installing the belt:
P
After the lead screw is secured to the motor shaft, rotate the shaft to position the
lead screw nut up against its limit nearest to the motor. Then set the headrest
horizontal lead screw nut to the same relative position (check for the same amount
of thread showing on both lead screws).
52235C1105
Parts Removal/Replacement
Confidential and Proprietary
3 - 45
Field Service Guide