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Service manual M695
Description microscope M695
Doc code 636 718
03/93 3077-HWE
Recognizing end of range
An encoder disk rotates with the zoom gear. The white field on the disk is
marking the limit area. It is sensed by two light barriers located on the zoom
servo.
If one of both light barriers senses the white field, through a gate the transistor
bridge is blocked for that direction of displacement.
Before removing the encoder disk:
Mark the disks position at its flange.
The adjustment of the disk is described in section 11 - “Replacing boards”
(Zoom servo).