45376001TH Rev.1
182 /
Oki Data CONFIDENTIAL
7. Troubleshooting and repair procedure
(8-2) Two-sided printing jam occurs during taking in the paper into Duplex unit.
Check item Check work
Action to be taken
at NG
(8-2-1) Solenoid operation check
Duplex solenoid Confirm that the Duplex solenoid works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.
Replace the
Duplexunit.
Separator DUP
(Paper unloading/
DUP paper taking-
in switching gate
located immediately
after the fuser unit)
Check visually movement of the gate by using
the Motor & Clutch Test of the self-diagnostic
mode. (EXIT SOLENOID)
Check if movement is unsmooth or not, if amount
of open/close is abnormal or not.
Replace the
Duplexunit.
ON/OFF timing of
the Duplex solenoid
While the cover is in the opened state, perform
the test print and confirm if the timing to open
the separator DUP is correct or not.
Replace the WR
sensor lever or
solenoid.
(8-2-2) Sensor lever operation check
Dup-IN sensor lever Open the rear cover. Touch the Dup-IN sensor
lever to check if its movement is unsmooth or
not.
Replace the
Duplexunit.
DUP-IN sensor Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function of
the self-diagnostic mode.
Replace the
Duplexunit.
(8-2-3) Check condition of the paper running path
Paper inverting
transport 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.
Check item Check work
Action to be taken
at NG
(8-2-4) Motor operation check
Duplex motor Confirm that the Duplex solenoid works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.
Open the rear cover and check rotation of the
roller.
Replace the
Duplexunit.
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
Duplexunit.
(8-3) Two-sided printing jam occurs in the process of reversing paper.
Check item Check work
Action to be taken
at NG
(8-3-1) Sensor lever operation check
Dup-IN sensor lever Open the rear cover. Touch the Dup-IN sensor
lever to check if its movement is unsmooth or
not.
Replace the
Duplexunit.
DUP-IN sensor Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function of
the self-diagnostic mode.
Replace the
Duplexunit.
(8-3-2) Motor operation check
Duplex motor Check if the paper reversing operation is started
or not by visual inspection when viewing through
slit of the rear cover.
If the paper reversing operation is not started,
check if movement of the planetary gear inside
the Duplex unit is unsmooth or not.
Replace the
Duplexunit.
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