Utax PF-3100, Service Manual

Page: 39 / 58

3S3
1-3-8
(5)The tray is not
descended even
though paper is
empty. Defective wire. Follow the flow chart below.
Defective tray bottom posi-
tion sensor.
Defective paper feed sen-
sor.
Defective PF main PWB.
Defective tray elevation
motor.
Problem Causes/check procedures Corrective measures
No
Start
No
No
No
Yes
Yes
Yes
Replace tray elevation motor.
Replace the wire between main
PWB and tray elevation motor.
Replace main PWB.
Replace/repair tray bottom
position sensor, or repair/replace
the actuator.
Replace/repair wire between main
PWB and tray bottom position
sensor.
Replace main PWB.
Replace paper feed sensor, or
repair/replace the actuator.
Replace/repair wire between main
PWB and paper feed sensor.
Replace main PWB.
Yes
Replace or repair wire.
Pin 3 of YC2 = 0 V?
Pin 3 of YC2 = 3.3 V?
Pin 1 of YC1 = 24 V
and pin 2 = 0 V?
Wire between
main PWB and tray
elevation motor is in good
status? (no damage coating,
or no connector loosen, etc?)
Is belt and driving part of the
tray elevation motor in
good status?