Paper Feed Jam (Error Code 390: Multipurpose Tray); Jam Occurs Immediately After The Power Is Turned On; Multipurpose Tray; Jam Occurs Immediately After Paper Feed Is Started - Oki MC873dn Maintenance Manual

Oki Data CONFIDENTIAL

2.5.5. (3-3) Paper feed jam (Error code 390: Multipurpose tray)

(3-3-1) Jam occurs immediately after the power is turned on. (Multipurpose tray)
Check item
(3-3-1-1) Check condition of the paper running path
Paper running path Check if paper is jammed or not in the paper
of the multipurpose running path.
tray
(3-3-1-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the sensor
levers of the IN2 levers have any abnormality or not.
sensor and the WR
sensor.
(3-3-1-3) Check condition of electrical parts
Check the detection Confirm that the sensor signals are normally
condition of the detected by using the SWITCH SCAN function of
sensor signal. the self-diagnostic mode.
Check the sensor Check for the following signals at the FSNS
output signal level of connector of the CU/PU board.
the IN2 sensor and Pin-2: WR sensor
the WR sensor. Pin-3: IN2 sensor
Confirm that the above signal levels change
when the sensor lever is operated.
Check the power Check the 5V power at the FSNS connector of
voltages supplied the front sensor board (RSG PCB).
to the front sensor Pin-1: 5V power supply
board (RSG PCB) Pin-5: 0VL
45850101TH Rev.1
Actions to be taken
Check work
at NG
Remove the
jammed paper.
(Refer to
the following
process)
Replace the
sensor with the
good sensor
lever.
Replace either
the CU/PU board
or the front
sensor board
(RSG PCB)
or connection
cable.
Replace the
front sensor
board (RSG
PCB)
Replace the
connection
cable.
(3-3-2) Jam occurs immediately after paper feed is started. (Multipurpose tray)
Check item
(3-3-2-1) Check condition of the paper running path
Paper running path Check if paper is jammed or not in the paper
of the multipurpose running path.
tray
Sheet Receive of the Confirm that the Sheet Receive has moved up

multipurpose tray

normally.
Confirm that the support spindle and spring of
the Sheet Receive have been installed in the
specified positions normally.
(3-3-2-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the sensor
levers of the IN2 levers have any abnormality or not.
sensor and the WR
sensor.
Front cover Confirm that the locks in the right and left of the
front cover are locked normally.
Check the feed Check if any foreign materials such as paper
roller, the pickup dust on the surface of the feed roller or of the
roller, and the retard pickup roller or not.
roller.
Check if the feed roller has worn out or not.
(3-3-2-3) Motor operation check
Hopping motor Confirm that the hopping motor works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.
Hopping motor driver Remove the MOTERCL connector of the CU/PU
board and check the following at the connector
side.
Several MΩ between pin-5 – FG.
Several MΩ between pin-6 – FG.
Several MΩ between pin-7 – FG.
Several MΩ between pin-8 – FG.
MPT clutch Carry out Motor & Clutch Test to check if the
MPT clutch works normally.
2. TROUBLESHOOTING PROCEDURES
Actions to be taken
Check work
at NG
Remove the
jammed paper.
(Refer to the
following process)
Correct installa-
tion of the above
parts so that the
Sheet Receive
moves up to the
specified posi-
tion normally.
Replace the
sensor with the
good sensor
lever.
Replace the font
cover assembly
Remove the
foreign material.
Replace the feed
roller.
Replace the
CU/PU board,
or replace the
hopping motor.
Replace the CU/
PU board.
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