45850101TH Rev.1
2-60
2. TROUBLESHOOTING PROCEDURES
2.5.5. (3-4) Two-sided printing jam (Error code: 370, 371, 372, 373)
(3-4-1) Two-sided printing jam occurs immediately after the power is turned on.
Check item Check work
Actions to be taken
at NG
(3-4-1-1) 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.
For all sensors except the Dup-IN sensor, check the
detection condition of the respective sensor in the
two status: One is the status in which paper remains
inside the Duplex unit. The other is the status in
which paper is removed from the Duplex unit.
Replace the
Duplex board
(GOH-1 PCB),
or replace the
defective sensor
or connection
cable.
(3-4-2) Two-sided printing jam occurs during taking in the paper into Duplex unit.
Check item Check work
Actions to be taken
at NG
(3-4-2-1) Solenoid operation check
Duplex clutch Confirm that the duplex clutch works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.
Replace the
GOH-1 board or
clutch.
Separator solenoid
(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.
Check if movement is unsmooth or not, if amount
of open/close is abnormal or not.
Replace the
separator
solenoid.
(3-4-2-2) Sensor lever operation check
Dup-IN sensor lever Remove the duplex unit. Touch the Dup-
IN sensor lever to check if its movement is
unsmooth or not.
Replace the
Dup-IN sensor
lever
Dup-B sensor lever Remove the duplex unit and check the movement
of the sensor lever.
Replace the
sensor lever.
DUP-IN sensor
Dup-B sensor
Check the sensitivity of each sensor in the two
conditions: one is the status in which paper remains
in the duplex unit, and the other is the status in
which no paper remains in the duplex unit.
Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function of
the self-diagnostic mode.
Replace the
Duplex board
(GOH-1 PCB),
or replace the
defective sensor
or connection
cable.
Check item Check work
Actions to be taken
at NG
(3-4-2-3) 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.
(3-4-3) Two-sided printing jam occurs during transporting paper inside the Duplex unit.
Check item Check work
Actions to be taken
at NG
(3-4-3-1) Sensor lever operation check
Dup-F sensor lever Remove the Duplex unit and check movement of
the Dup-F sensor lever.
Replace the
Dup-F sensor
lever.
Dup-R sensor lever Remove the Duplex unit and check movement of
the Dup-R sensor lever.
Replace the
Dup-R sensor
lever.
(3-4-3-2) Sensor check
Check the detection
condition of the
sensor signal
Check the sensitivity of each sensor in the two
conditions: one is the status in which paper
remains in the duplex unit, and the other is the
status in which no paper remains in the duplex
unit.
Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function of
the self-diagnostic mode.
Replace the
Duplex board
(GOH-1 PCB),
or replace the
defective sensor
or connection
cable.
(3-4-4) Paper is not supplied from the Duplex unit to the regist roller.
Check item Check work
Actions to be taken
at NG
(3-4-4-1) 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
GOH-1 board or
clutch.
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