Ricoh FT5540 Service Manual page 66

31 August 1989
Code #22: Scanner Home Position Sensor Stays High
Definition:
Lights if the scanner home position sensor is open at power up.
Observation:
Scanner eventually moves to the extreme right as on/off key is activated until code 2d is
displayed.
Points to Check:
Check that the scanner is working properly. Check CN305-3 on the optics board.
Code #24: No Home Position Signal
Definition:
Lights if the main board does not receive the H.P. signal from the optics board within 20
seconds after the scanner return signal.
Observation:
Code 24 is displayed 20 seconds after power-up.
Points to Check:
Check CN106-5 and 6 on the main PCB.
Check CN304-4 and 5 on the optics board.
Code #25: Scanner Home Position Sensor Stays Low
Definition:
Lights if the scanner home position sensor is shorted at power up.
Observation:
Scanner moves to the extreme left at power up.
Points to Check:
Check CN305-3 on the optics board.
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