44015503TH Rev. 1
195 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURE
(5-2) Jam occurs immediately after paper feed is started. (Multipurpose tray)
Check item Check work
Action to be taken
at NG
(5-2-1) Check condition of the paper running path
Paper running path
of the multipurpose
tr
ay
Check if paper is jammed or not in the paper
running path.
Remove the
jammed paper.
Sheet Receive of
the multipurpose
tray
Confirm that the Sheet Receive has moved up
normally.
Confirm that the support spindle and spring of
the Sheet Receive have been installed in the
specified positions normally.
Correct
installation of
the above parts
so that the
Sheet Receive
moves up to
the specified
position
normally.
(5-2-2) Check condition of the mechanical parts
Check the sensor
levers of the paper
entrance sensor 2
and the WR sensor.
Check if shape and movement of the sensor
levers have any abnormality or not.
Replace the
sensor with the
good sensor
lever.
Planetary gear for
paper feed control
Rotate the paper feed motor (FRONT MOTOR)
using the Motor & Clutch Test of the self-
diagnostic mode, and confirm that both of the
two planetary gears rotate at the bottom position.
(The planetary gear box can be located because
it is the white molded block that is located on the
right side when the front cover is opened.)
Replace the
planetary gear
box
F
ront cover Confirm that the locks in the right and left of the
front cover are locked normally.
Replace the font
cover assembly
Check the feed
roller and the pickup
roller.
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 has worn out or not. Replace the feed
roller.
Check item Check work
Action to be taken
at NG
(5-2-3) Motor operation check
P
aper feed motor Confirm that the paper feed motor works
normally by using the Motor & Clutch Test of the
self-diagnostic mode.
Replace the
PU board, or
replace the
paper feed
motor.
Paper feed motor
driver
Remove the HOPSIZE connector
of the 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 PU
board.
(5-2-4) Check the system connection
Paper feed motor
drive cable
Chec
k the connection condition of the cable.
Check if the connector is connected in the half-
way only or not, and check if the connector is
inserted in a slanted angle or not.
Check also that cables are assembled without
any abnormality.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Paper feed motor
drive cable
Check that any cable is not pinched during
assembling of the printer.
Remove the HOPSIZE connector no. 1 of the
PU board and check the followings at the cable
side.
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Paper feed motor Remove the HOPSIZE connector
of the
PU board and check that approx. 3.4
Ω
can be
measured between pin-1 -pin-2, and that approx.
5
Ω
can be measured between pin-3 -pin-4
respectively.
Replace the
paper feed
motor.
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