Ricoh FT5233 Service Manual page 853

SERVICE CALL CONDITIONS
Check the timing sensor. (between CN180-7 and the ground)
Good
≤ 1.0 V
≥ 4.0 V
Check the continuity between CN180 and CN450.
Replace the timing sensor.
Replace the main control board.
No good
> 1.0 V
< 4.0 V
Good No Good
Repair the harness.
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12 February 1992