AR-F12 (serv.man8). Maintenance, inspection and troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 46

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8-41
CHAPTER 8   TROUBLESHOOTING
B.
Saddle Stitch Unit
1.
Faulty paper positioning plate
2.
Faulty paper folding motor
Checks
Check the paper positioning
plate home position sensor.
Is the sensor normal?
Do the paper positioning
plates operate at a specific
timing?
Replace the paper
positioning plate motor. Is
the problem corrected?
Cause
Paper positioning plate
home position sensor
(PI7S)
Saddle stitch controller
PCB
Paper positioning plate
motor (M4S)
Saddle stitch controller
PCB
Step
1
2
3
Yes/No
No
Yes
No
Yes
No
Action
Replace the sensor.
Replace the saddle
stitcher controller
PCB.
Check the
positioning plate
drive mechanism. If a
fault is found, correct
it. Otherwise, go to
step 3.
End.
Replace the saddle
stitch controller PCB.
Checks
Check the paper folding
motor clock sensor. Is the
sensor normal?
Check the paper folding
home position sensor. Is the
sensor normal?
Does the paper folding
motor operate at a specific
timing?
Replace the paper folding
motor. Is the problem
corrected?
Cause
Paper folding motor
clock sensor (PI4S)
Paper folding home
position sensor (PI21S)
Saddle stitch controller
PCB
Paper folding motor
(M2S)
Saddle stitch controller
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.
Check the paper
folding roller drive
mechanism. If a fault
is found, correct it.
Otherwise, go to step
4.
End.
Replace the saddle
stitch controller PCB.

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