No Registration Start Signal; No Scanner Home Position Signal - Ricoh FT4430 Service Manual

16 April '88

23 NO REGISTRATION START SIGNAL

-
Possible Causes -
+ Optics control circuit failure (no registration signal)
- Action -
Replace the main board. If the problem still exists, check the scanner drive
motor.

24 NO SCANNER HOME POSITION SIGNAL

- Possible Causes -
+ Scanner does not return to home position within 20 seconds after scanner
start.
+ Optics control circuit failure.
+ Scanner home position sensor failure.
- Action =
Does the scanner return to the home position within 20 seconds after scan-
ning starts?
N
Y
I L
heck/repair the scanner drive mechanism.
Does CNI 01 -B7 stay HIGH when the scanner leaves the home position?
Y N
I I
Replace the main board.
Check the scanner home position sensor circuit. Replace the scanner home
position sensor if necessary.
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