44473001TH Rev.1
237 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING PROCEDURES
Check item Check operation
Actions for NG
results
(8-2-3) Check condition of the paper running path
Paper inverting
tr
ansport path
Check that any foreign materials such as paper
chip or blue do not exist that hampers the
smooth movement of paper in the paper inverting
transport path.
Remove
the foreign
material.
(8-2-4) Motor operation check
Duplex pull-in/
reversing roller and
its pinch roller
Check if the pull-in/reversing roller of the Duplex
unit contacts or not with the pinch roller of the
cover side when the Duplex rear cover is closed.
(Does the pinch roller rotate when the roller is
rotating?)
Replace the
rear cover.
(8-3) Two-sided printing jam occurs in the process of reversing paper.
Check item Check operation
Actions for NG
results
(8-3-1) Sensor lever operation check
DUP-R sensor lever Open the rear cover. Touch the Dup-IN sensor
lever to check if its movement is unsmooth or not.
Replace the
DUP-R sensor
lever
DUP-R sensor Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function of
the self-diagnostic mode.
Replace the
CU/PU board,
the sensor or
its connection
cord.
(8-3-2) Motor operation check
Fuser motor Visually check whether paper started being
reversed.
When no paper reversing operation has
performed, check whether the planet gear at the
lower right side of the fuser moves smoothly.
R
e
place the
planetary gear.
(8-4) Two-sided printing jam occurs during transporting paper inside the Duplex unit.
Check item Check operation
Actions for NG
results
(8-4-1) Sensor lever operation check
Dup-R, Dup-F
se
nsor lever
Open the top cover, remove the image drums
and the belt unit and check the operation of the
DUP-F sensor lever.
Replace the
sensor lever.
(8-4-2) Sensor check
Check the detection
condition of the
sensor signal
Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function of
the self-diagnostic mode.
Check sensor detection with paper in the duplex
unit, and with it removed from the duplex unit.
Replace the
CU/PU board,
appropriate
sensor(s) or
connection
cord(s).
(8-5) Paper is not supplied from the Duplex unit to the regist roller.
Check item Check operation
Actions for NG
results
(8-5-1) Clutch operation check
Duplex clutch Confirm that the Duplex clutch works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.Confirm it by listening to the
sound.
Replace the
CU/PU board
or the clutch.
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