Ricoh FT8680 Service Manual page 379

31 July 1995
SC505 - 1st Tray Drive Abnormal
Definition:
The main PCB cannot detect any pulses from the first tray paper volume
sensor within 3 seconds after the tray up or down operation has been started.
Points to check:
•
Mechanical interference with the tray drive
•
Paper volume sensor
•
Tray drive motor
•
Interface PCB
•
FU2 on the power supply unit (dc 24 V)
•
Main PCB
SC507 - 1st Tray Lower Limit Sensor Failure
Definition:
The main PCB cannot detect the lower limit sensor signal within 4.5 seconds
after the tray down operation has been started.
Points to check:
•
Lower limit sensor
•
Tray drive motor
•
Tray drive wires
•
Interface PCB
SC508 - 2nd Tray Drive Abnormal
Definition:
The main PCB cannot detect any pulses from the 2nd tray paper volume
sensor within 3 seconds after the tray up or down operation has been started.
Points to check:
•
Mechanical interference with the tray drive
•
Paper volume sensor
•
Tray drive motor
•
Interface PCB
•
FU2 on the power supply unit (dc 24 V)
•
Main PCB
SYSTEM ERROR AND SERVICE CALL CONDITIONS
6-17