Read Sharp AR-F12 (serv.man8) Service Manual online
8-50
CHAPTER 8 TROUBLESHOOTING
4.
Size detection failure
Checks
Does the paper length
sensor (TP48) become +5V
when there are papers?
sensor (TP48) become +5V
when there are papers?
Does the separation sensor
(TP50) become +5V when
there are papers?
(TP50) become +5V when
there are papers?
Does the output (TP47) of the
paper width detection volume
become more than +4V with the
guide broadened and less than
+2.5V with the guide narrowed?
paper width detection volume
become more than +4V with the
guide broadened and less than
+2.5V with the guide narrowed?
Are the separation roller and
paper not slipping?
paper not slipping?
Cause
Paper length sensor
Separation sensor
Paper width detection
Separation roller
Step
1
2
3
4
Yes/No
No
No
No
No
Yes
Action
Check the paper
length sensor and
replace it.
length sensor and
replace it.
Check the separation
sensor and replace it.
sensor and replace it.
Check the paper
width detection
volume and replace
it.
width detection
volume and replace
it.
Check the PC board
and replace it.
and replace it.
Clean up the
separation roller and
replace it, and adjust
the pressure and so
on.
separation roller and
replace it, and adjust
the pressure and so
on.
5.
Fan operation failure
Checks
Is the fan load normal?
Is the power voltage
supplied to the motor
connector? Is the connector
connected properly?
supplied to the motor
connector? Is the connector
connected properly?
Is the power supplied to the
CN8_1pin?
CN8_1pin?
Cause
Fan load
Connector
Power supply
Fan motor
Step
1
2
3
Yes/No
No
No
No
Yes
Action
Remove the
extraneous materials.
extraneous materials.
Check the connector
and connect it
properly.
and connect it
properly.
Check the PC board
and replace it.
and replace it.
Check the fan motor
and replace it.
and replace it.
