Oki C911 - Paper Unloading Jam Occurs in the Middle of Paper Running Path; Duplex Printing Jam (Errors 370, 371, 372, 373 and 383); Duplex Printing Jam Occurs Immediately after the Power Is Turned on; Duplex Printing Jam Occurs During Taking in the Paper into Duplex Unit

45530603TH Rev.2
4-70
Oki Data CONFIDENTIAL
4. TROUBLESHOOTING PROCEDURE
Check item Check work
Actions to be taken
at NG
(8-2-4) Check the system connection
Fuser motor drive
cable
Check the connection condition of the cables.
Visually check the PU/CU PCB DCHEAT
connector for half-way connection, slanted
angle insertion, and abnormal cord assembly.
Also check the connector connected with the
fuser motor in the same manner.
Normalize the
connection
condition.
Replace with a
normal cable.
(8-3) Paper unloading jam occurs in the middle of paper running path.
Check item Check work
Actions to be taken
at NG
(8-3-1) Motor operation check
Fuser motor Confirm that the fuser motor works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.
Check if any load exists or not.
Replace the
PU/CU PCB,
fuser motor, or
fuser unit.
4.5.2.(9) Duplex printing jam (Errors 370, 371, 372, 373 and 383)
(9-1) Duplex printing jam occurs immediately after the power is turned on.
Check item Check work
Actions to be taken
at NG
(9-1-1) Check condition of electrical parts
Check the detection
condition of the
sensor signal.
C onfirm 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 PCB,
faulty sensor,
or connection
cable.
(9-2) Duplex printing jam occurs during taking in the paper into Duplex unit.
Check item Check work
Actions to be taken
at NG
(9-2-1) Solenoid operation check
Duplex separator
solenoid
(Paper unloading/
DUP paper taking
in switching gate
located immediately
after the fuser unit)
Visually check movement of the gate by using
the Motor & Clutch Test of the self-diagnostic
mode.
Check whether movement is unsmooth or
not, and whether the amount of open/close is
abnormal or not.
Replace
the Duplex
separator
solenoid (on
the printer unit).
(9-2-2) Sensor lever operation check
Dup-IN sensor
lever
Remove the duplex unit. Touch the Dup-IN
sensor lever on the printer side to check if its
movement is unsmooth or not.
Replace the
Dup-IN sensor
lever
Dup-Bottom sensor
lever
Remove the duplex unit and check the
movement of the sensor lever.
Replace the
sensor lever.
DUP-IN sensor
Dup-Bottom 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 PCB,
faulty sensor,
or connection
cable.