Faulty Height Sensor (Adjustment); Faulty Back-Up Ram; Faulty Delivery Motor - Sharp AR-FN8 Service Manual

CHAPTER 7 TROUBLESHOOTING
5.

Faulty height sensor (adjustment)

Cause
Adjustment
Wiring
Power supply
Height sensor (PS1)
6.

Faulty back-up RAM

Cause
Finisher controller PCB,
punch drive PCB
7.

Faulty delivery motor

Cause
Delivery roller
Delivery motor clock
sensor (PI10)
Finisher controller PCB
7-34
Step Checks
1 Try making adjustments using
the DIP switch once again. Is
the problem corrected?
2 Is the wiring between the
finisher controller PCB and
sensors normal?
3 Measure the voltage between
J6-2 (+) and J6-4 (−) on the
finisher controller PCB. Is it 5
VDC?
Step Checks
1 Turn the host machine OFF,
then ON. Is the problem
corrected?
2 Replace the finisher controller
PCB and punch driver PCB. Is
the problem corrected?
Step Checks
1 Turn the delivery roller by
hand. Does it turn smoothly?
2 Check the delivery motor clock
sensor. Is the sensor normal?
3 Does the voltage between J11-
4 and J11-5 on the finisher
controller PCB change to 24
VDC as soon as the delivery
motor starts to rotate?
Yes/No Action
Yes End.
No Correct the wiring.
No Replace the finisher
controller PCB.
Yes Replace the height
sensor.
Yes/No Action
Yes End.
Yes End.
Yes/No Action
No Correct mechanical
operation.
No Replace the sensor.
No Replace the finisher
controller PCB.
Yes Check the wiring from
the motor to the
controller PCB. If
normal, replace the
motor.