Read Sharp AR-F12 (serv.man8) Service Manual online
8-43
CHAPTER 8 TROUBLESHOOTING
5.
Faulty stitcher
6.
Faulty paper pushing plate motor (related to PI14S)
Checks
Are the front and rear
stitchers and bases installed
correctly?
stitchers and bases installed
correctly?
Is the stitching home position
switch of the front and the rear
stitchers normal?
switch of the front and the rear
stitchers normal?
Do the front and the rear
stitchers operate at a specific
timing?
stitchers operate at a specific
timing?
Cause
Stitcher (installation)
Stitching home position
switch (MS7S/MS5S)
switch (MS7S/MS5S)
Saddle stitch controller
PCB
PCB
Stitcher motor (M7S/
M6S)
M6S)
Step
1
2
3
Yes/No
No
No
Yes
No
Action
Install them correctly.
Replace the front or
rear stitcher.
rear stitcher.
Check the wiring
between the stitcher and
the saddle stitch
controller PCB. If
normal, replace the
controller PCB.
between the stitcher and
the saddle stitch
controller PCB. If
normal, replace the
controller PCB.
Replace the front or
the rear stitcher.
the rear stitcher.
Checks
Check the paper pushing
plate home position sensor.
Is the sensor normal?
plate home position sensor.
Is the sensor normal?
Check the paper pushing
plate top position sensor. Is
the sensor normal?
plate top position sensor. Is
the sensor normal?
Does the paper pushing
plate motor operate at a
specific timing?
plate motor operate at a
specific timing?
Replace the paper pushing
plate motor. Is the problem
corrected?
plate motor. Is the problem
corrected?
Cause
Paper pushing plate
home position sensor
(PI14S)
home position sensor
(PI14S)
Paper pushing top
position sensor (PI15S)
position sensor (PI15S)
Saddle stitch controller
PCB
PCB
Paper pushing plate
motor (M8S)
motor (M8S)
Saddle stitch controller
PCB
PCB
Step
1
2
3
4
Yes/No
No
No
Yes
No
Yes
No
Action
Replace the sensor.
Replace the sensor.
Replace the saddle stitch
controller PCB
controller PCB
Check the paper
pushing plate drive
mechanisms. If a
fault is found, correct
it. Otherwise, go to
step 3.
pushing plate drive
mechanisms. If a
fault is found, correct
it. Otherwise, go to
step 3.
End.
Replace the saddle
stitch controller PCB.
stitch controller PCB.
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