44951501TH Rev.2
7-48
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
(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.
Replace 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
sensor 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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