SERVICE CALL CONDITIONS
SM 4-7 B135/B138
Trouble
shooting
Code No. Symptom Possible Cause
Cooling fan motor lock 492 C
A cooling fan motor lock signal is not
detected within 5 seconds after the
cooling fan motor turns on.
• Too much load on the drive
mechanism
• Cooling fan motor defective or a
loose object is interfering with the fan
• Poor fan motor connector connection
1st Tray lift malfunction 501 C
The paper height sensor is not
activated after the tray lift motor has
been on for 10 seconds. If the main
power switch is turned on when the
paper is already at the feed height, the
paper height position is detected again.
At this time, the paper height sensor
should de-activate within 5 seconds
after the paper bottom plate starts to
drop. If it does not deactivate within 5 s
four times consecutively, a message
will prompt the user to reset Tray 1.
After two attempts to release the error
by re-setting the paper tray, if this does
not solve the problem then this SC is
displayed.
• Lift motor malfunction or
disconnected
• Height sensor abnormal, or connector
loose
• Loose paper or object between the
tray and motor
• Pick-up arm malfunction
2nd Tray lift malfunction 502 C
The paper height sensor is not
activated after the tray lift motor has
been on for 10 seconds. If the main
power switch is turned on when the
paper is already at the feed height, the
paper height position is detected again.
At this time, the paper height sensor
should de-activate within 5 seconds
after the paper bottom plate starts to
drop. If it does not deactivate within 5 s
four times consecutively, a message
will prompt the user to reset Tray 2.
After two attempts to re-set the paper
tray, if this does not solve the problem
then this SC is displayed.
• Lift motor abnormal or disconnected
• Height sensor defective or
disconnected
• Loose paper or object between the
tray and motor
• Pick-up arm malfunction
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