Faulty Microswitch (Related To Ms1S); Faulty Microswitch (Related To Ms2S) - Sharp AR-FN8 Service Manual

CHAPTER 7 TROUBLESHOOTING

12. Faulty microswitch (related to MS1S)

Cause
Switch actuator
Inlet door switch (MS1S)
Inlet cover sensor (PI9S)
Power supply, wiring

13. Faulty microswitch (related to MS2S)

Cause
Switch actuator
Front door switch
(MS2S)
Front door open/closed
sensor (PI12S)
7-48
Step Checks
1 Check the switch actuator of
the inlet door. Do the switch
and the sensor operate
correctly?
2 Check the inlet door switch. Is
the switch normal?
3 Measure the voltage at J10-8
on the saddle stitcher
controller PCB with the inlet
cover open. Is it 5 V?
4 Measure the voltage between
J19-1 (+) and J19-2 (−) on the
finisher controller PCB. Is it
24 V?
Step Checks
1 Check the switch actuator of
the front door. Do the switch
and the sensor operate
correctly?
2 Check the front door switch.
Is the switch normal?
3 Measure the voltage at J11-12
on the saddle stitcher
controller PCB with the front
door open. Is it 5 V?
Yes/No Action
No Correct the
mechanism.
No Replace the switch.
Yes The sensor is faulty.
Replace the sensor.
No Replace the finisher
controller PCB.
Yes Check the wiring
between J19 on the
finisher controller PCB
and J1 on the saddle
stitcher controller
PCB. If a fault is
found, correct it.
Otherwise, replace the
saddle stitcher
controller PCB.
Yes/No Action
No Correct the
mechanism.
No Replace the switch.
Yes The sensor is faulty.
Replace the sensor.
No Replace the saddle
stitcher controller
PCB.