AR-FN1 (serv.man9). ARFN1 Service Manual-Troubleshooting - Sharp Copying Equipment Service Manual (repair manual). Page 6

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(4) Stepping moter error
(5) Sensor error
(6) Clutch and solenoid error
4
NO
YES
YES
NO
NO
YES
Is load on motor
shaft normal?
Is motor winding
shorted?
Is harness connected
normally?
Check main PWB and
replace if necessary.
Remove foreign matter.
Replace motor.
Connect harness
properly.
5
NO
YES
Replace main PWB.
Check sensor mounting
and harness and replace
if necessary.
Is sensor
mounted properly?
   Is harness connected
properly?
6
NO
YES
NO
YES
NO
YES
Is each
load properly
mounted?
Conduction
between coils of each
load?
Conduction
between connectors and
terminals?
Replace main PWB.
Check mounting and
replace if necessary.
Replace clutch or
solenoid.
Check harness and
replace if necessary.
8 – 4
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