Sharp AR-F15 Service Manual page 254

CHAPTER 7 TROUBLESHOOTING
5. Faulty stitcher
Cause
Stitcher (installation)
Stitching home position
switch (MS7S/MS5S)
Saddle stitch controller
PCB
Stitcher motor (M7S/
M6S)
6. Faulty paper pushing plate motor (related to PI14S)
Cause
Paper pushing plate
home position sensor
(PI14S)
Paper pushing top
position sensor (PI15S)
Saddle stitch controller
PCB
Paper pushing plate
motor (M8S)
Saddle stitch controller
PCB
7-40
Step Checks
1 Are the front and rear
stitchers and bases installed
correctly?
2 Is the stitching home position
switch of the front and the rear
stitchers normal?
3 Do the front and the rear
stitchers operate at a specific
timing?
Step Checks
1 Check the paper pushing
plate home position sensor.
Is the sensor normal?
2 Check the paper pushing
plate top position sensor. Is
the sensor normal?
3 Does the paper pushing
plate motor operate at a
specific timing?
4 Replace the paper pushing
plate motor. Is the problem
corrected?
Yes/No Action
No Install them correctly.
No Replace the front or
rear stitcher.
Yes Check the wiring
between the stitcher and
the saddle stitch
controller PCB. If
normal, replace the
controller PCB.
No Replace the front or
the rear stitcher.
Yes/No Action
No Replace the sensor.
No Replace the sensor.
Yes Replace the saddle stitch
controller PCB
No Check the paper
pushing plate drive
mechanisms. If a
fault is found, correct
it. Otherwise, go to
step 3.
Yes End.
No Replace the saddle
stitch controller PCB.