44205401TH Rev.1
161 /
Oki Data CONFIDENTIAL
7. Troubleshooting and repair procedure
7.5.2. (3) Paper feed jam (error code 391: 1st tray)
(3-1) Jam occurs immediately after the power is turned on. (1st tray)
Check item Check work
Action to be taken
at NG
(3-1-1) Check condition of the paper running path
Paper running path
of the front unit
Open the front co
ver check if paper is not
jammed in the paper running path.
Remove the
jammed paper
.
(3-1-2) Check condition of the mechanical parts
Check the sensor
lev
ers of the paper
entrance sensor
1 and the paper
entrance sensor 2.
Check if shape and mov
ement of the sensor
levers have any abnormality or not.
Replace the
sensor lever with
the good sensor
lever.
(3-1-3) Check condition of electrical parts
Check the detection
condition of the
sensor signal.
Confirm that the sensor signals are normally
detected by using the Maintenance Menu
SWITCH SCAN function.
Replace either
the CU/PU board
or the front
sensor board
(RSF PCB)
or connection
cable.
Check output signal
level of the paper
entrance sensor 1
and that of the paper
entrance sensor 2.
Chec
k for the f
ollowing signals at the FSNS
connector of the CU/PU board.
Pin-4: Paper entrance sensor 1
Pin-3: Paper entrance sensor 2
Confirm that the above signal levels change
when the sensor lever is operated.
Replace the
front sensor
board (RSF
PCB)
Check the power
voltages supplied
to the front sensor
board (RSF PCB)
Check the 5V power at the FSNS connector
of the front sensor board (RSF PCB).
Pin-1: 5V power supply
Pin-5: 0VL
Replace the
connection
cable.
(3-2) Jam occurs immediately after the paper feed is started. (1st tray)
Check item Check work
Action to be taken
at NG
(3-2-1) Check condition of the paper running path
Paper running path
of the front unit
Check if paper is jammed or not in the paper
running path.
Remove the
jammed paper.
(3-2-2) Check condition of the mechanical parts
Check the sensor
levers of the paper
entrance sensor
1 and the paper
entrance sensor 2.
Check if shape and movement of the sensor
levers have any abnormality or not.
Replace the
sensor with the
good sensor
lever.
Check the separator
assemblies of the
feed roller, the
pickup roller and the
tray.
Check if any foreign materials such as paper
dust on the surface of the feed roller or of the
pickup roller or not.
Remove the
foreign material.
Check if the feed roller or the pickup roller has
worn out or not.
Replace the
separator
assemblies of the
feed roller, pickup
roller and tray.
(3-2-3) Motor operation check
Paper feed motor Confirm that the paper feed motor works
normally by using the Motor & Clutch Test of the
self-diagnostic mode.
Replace the CU/
PU board or the
paper feed motor.
Paper feed motor
driver
Remove the HP_PSZCL connector
of the
CU/PU board and check the followings at the
connector side.
Several M
Ω
between pin-1 – FG.
Several M
Ω
between pin-2 – FG.
Several M
Ω
between pin-3 – FG.
Several M
Ω
between pin-4 – FG.
Replace the
CU/PU board.
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