Oki MC561, Maintenance Manual, Page: 231 / 276

44473001TH Rev.1
231 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
(5-2) Jam occurs immediately after paper feed is started. (Multipurpose tray)
Check item Check operation
Actions for NG
results
(5-2-1) Check condition of the paper running path
Paper running path
of the multipurpose
tray
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
IN sensor and WR
sensor lever check Check the sensor lever shapes and operations
for any problem Replace the
sensor lever(s)
with proper
one(s).
Front 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 operation Actions for NG
results
(5-2-3) 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 feed motor.
Paper feed motor
driver
Pull out the CU/PU board HOP connector 1, and
check the following at the side of the connector:
Several M between pin-1 – FG
Several M between pin-2 – FG
Several M between pin-3 – FG
Several M between pin-4 – FG
Replace the
CU/PU board.
(5-2-4) Check the system connection
Paper feed motor
drive cable
Check 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.
Pull out the CU/PU board HOP connector 1, and
check the following at side of the cord:
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 Pull out the CU/PU board HOP connector 1,
and check whether there is a resistance of
approximately 3.4 or 5 between the pins 1
and 2 and between the pins 3 and 4.
Replace the
paper feed
motor.