Read Sharp AR-F12 (serv.man8) Service Manual online
8-47
CHAPTER 8 TROUBLESHOOTING
13. Faulty microswitch (related to MS2S)
14. Faulty microswitch (related to MS3S)
Checks
Check the switch actuator of
the front door. Do the switch
and the sensor operate
correctly?
the front door. Do the switch
and the sensor operate
correctly?
Check the front door switch.
Is the switch normal?
Is the switch normal?
Measure the voltage at J11-
12 on the saddle stitch
controller PCB with the
front door open. Is it 5 V?
12 on the saddle stitch
controller PCB with the
front door open. Is it 5 V?
Cause
Switch actuator
Front door switch
(MS2S)
(MS2S)
Front door open/closed
sensor (PI12S)
sensor (PI12S)
Step
1
2
3
Yes/No
No
No
Yes
No
Action
Correct the
mechanism.
mechanism.
Replace the switch.
The sensor is faulty.
Replace the sensor.
Replace the sensor.
Replace the saddle
stitch controller PCB.
stitch controller PCB.
Checks
Check the delivery door
switch actuator. Do the
switch and the sensor
operate correctly?
switch actuator. Do the
switch and the sensor
operate correctly?
Check the delivery door switch.
Is the switch normal?
Is the switch normal?
Measure the voltage at J11-
9 on the saddle stitch
controller PCB with the
delivery door open. Is it 5
V?
9 on the saddle stitch
controller PCB with the
delivery door open. Is it 5
V?
Cause
Switch actuator
Delivery switch (MS3S)
Delivery cover sensor
(PI3S)
(PI3S)
Step
1
2
3
Yes/No
No
No
Yes
No
Action
Correct the
mechanism.
mechanism.
Replace the switch.
The sensor is faulty.
Replace the sensor.
Replace the sensor.
Replace the saddle
stitch controller PCB.
stitch controller PCB.
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