44346001TH Rev.1
170 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
7.5.2. (8) Two-sided printing jam (error code: 370, 371, 372, 373, 383)
(8-1) Two-sided printing jam occurs immediately after the power is turned on.
Check item
Check operation
Actions for NG
results
(8-1-1) Check condition of the paper running path
Paper running path
of the Duplex unit
Check if paper is jammed or not in the paper
running path.
Open the front cover and check if any paper
remains in the Duplex feeder or not.
Open the rear cover and check if any paper
remains in the paper reversing path or not.
Remove the Duplex unit. Check if any paper
exists in the Duplex insertion slot or not. Open
the cover of the Duplex paper running path and
check if any paper remains inside of the Duplex
unit.
Remove the
jammed paper.
(8-1-2) Check condition of the mechanical parts
Check the sensor
levers of the
respective sensors
of the Duplex unit.
Check if shape and movement of the sensor
levers have any abnormality or not.
Replace the
sensor lever
with the good
sensor lever.
(8-1-3) Check condition of electrical parts
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
Duplex board
(V7Y PCB),
or replace the
defective sensor
or connection
cable.
(8-2) Two-sided printing jam occurs during taking in the paper into Duplex unit.
Check item
Check operation
Actions for NG
results
(8-2-2) Sensor lever operation check
DUP-R sensor
lever
Open the top cover, remove the image drums
and the belt unit, and touch the DUP-R sensor
lever to check whether it moves smoothly.
Replace the
DUP-R sensor
lever.
DUP-IN 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,
or appropriate
sensor(s) or
connection
cord(s).
(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.
(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.
