Two-Sided Printing Jam Occurs During Taking In The Paper Into Duplex Unit; Two-Sided Printing Jam Occurs In The Process Of Reversing Paper - Oki C710 Maintenance Manual

Oki Data CONFIDENTIAL

(8-2) Two-sided printing jam occurs during taking in the paper into Duplex unit.

Check item
(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.
Separator DUP Check visually movement of the gate by using
(Paper unloading/ the Motor & Clutch Test of the self-diagnostic
DUP paper taking- mode. (EXIT SOLENOID)
in switching gate Check if movement is unsmooth or not, if
located immediately amount of open/close is abnormal or not.
after the fuser unit)
ON/OFF timing of While the cover is in the opened state, perform
the Duplex solenoid the test print and confirm if the timing to open
the separator DUP is correct or not.
(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.
DUP-IN sensor Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function
of the self-diagnostic mode.
(8-2-3) Check condition of the paper running path
Paper inverting Check that any foreign materials such as
transport path paper chip or blue do not exist that hampers
the smooth movement of paper in the paper
inverting transport path.
43856301TH Rev.3
Action to be taken
Check work
at NG
Replace the
V7Y board or
solenoid.
Replace the
separator DUP.
Replace the WR
sensor lever or
solenoid.
Replace the
Dup-IN sensor
lever
Replace the
Duplex board
(V7Y PCB),
or replace the
defective sensor
or connection
cable.
Remove the
foreign material.
Check item
(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.
Duplex pull-in/ Check if the pull-in/reversing roller of the Duplex
reversing roller and unit contacts or not with the pinch roller of the
its pinch roller cover side when the Duplex rear cover is closed.
(Does the pinch roller rotate when the roller is
rotating?)

(8-3) Two-sided printing jam occurs in the process of reversing paper.

Check item
(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.
DUP-IN sensor Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function
of the self-diagnostic mode.
(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.
7. Troubleshooting and repair procedure
Action to be taken
Check work
at NG
Replace the
V7Y board or
motor.
Replace the
rear cover.
Action to be taken
Check work
at NG
Replace the
Dup-IN sensor
lever
Replace the
Duplex board
(V7Y PCB),
or replace the
defective sensor
or connection
cable.
Replace the
planetary gear.
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