Oki MC561, Maintenance Manual

Page: 233 / 276

44473001TH Rev.1
233 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
Check item Check operation Actions for NG
results
(6-2-4) Check the system connection
Feed motor driving
cord, image drum
motor driving cord,
belt motor, fuser
driving cord
Check the connection condition of the cables.
CU/PU board HOP connector 12, DC ID
connector , DCHEAT connector , BELT
connector 3.
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.
Normalize the
connection
condition.
Replace the
cable with the
normal cable.
Feed motor driving
cord, image drum
motor driving cord,
belt motor driving
cord
Check that any cable is not pinched during
assembling of the printer.
Pull out the CU/PU board BELT connector 3, and
check the following at the sides of the cords:
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Pull out the CU/PU board HOP connector, and
check the following at the side of the cords:
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.
Feed motor, belt
motor
Remove the respective connectors from the
board, and confirm that the following resistance
exists between the corresponding pins, at the
cable side.
CU/PU board HOP connector 1
Between pin-1-pin-2 Approx. 3.4 or approx. 5 .
Between pin-3-pin-4 Approx. 3.4 or approx. 5 .
CU/PU board BELT connector 3
Between pin-1-pin-2 Approx. 6.1 or approx. 3.5 .
Between pin-3-pin-4 Approx. 6.1 or approx. 3.5 .
Between pin-5-pin-6 Approx. 3.4 or approx. 5 .
Between pin-7-pin-8 Approx. 3.4 or approx. 5 .
Replace paper
feed motor, belt
motor, ID Up
motor.
(6-3) Jam occurs in the middle of paper running path.
Check item Check operation
Actions for NG
results
(6-3-1) Motor operation check
Paper feed motor
driver, belt motor
driver and ID motor
Confirm that the paper feed motor, belt motor
and ID motor work normally by using the Motor &
Clutch Test of the self-diagnostic mode.
Check if any load exists or not.
Replace: the
CU/PU board;
the feed motor,
the belt motor
and the image
drum motor; or
the image drum
unit and the
belt unit.
If any attempt
of using new
ID unit or new
belt unit as a
trial is going
to be made,
be sure to use
the System
Maintenance
Menu FUSE
KEEP MODE.
Paper feed motor,
belt motor
Pull out the CU/PU board BELT connector 1, and
check the following at the side of the connector:
Several M between Pin 1 and frame ground
Several M between Pin 2 and frame ground
Several M between Pin 3 and frame ground
Several M between Pin 4 and frame ground
Pull out the CU/PU board HOP connector 3, 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