Paper Unloading Jam Occurs After A Paper Is Taken Into Printer - Oki MC873dn Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(3-2-2-4) Check the system connection
Hopping motor Check the connection condition of the cable.
drive cable Check if the connector is connected in
the half-way only or not, and check if the
connector is inserted in a slanted angle or not.
Check also that cables are assembled without
any abnormality.
Hopping motor Check that any cable is not pinched during
drive cable assembling of the printer.
Remove the MOTERCL connector of the CU/
PU board and check the following at the cable
side.
Short circuit between pin-5 – FG
Short circuit between pin-6 – FG
Short circuit between pin-7 – FG
Short circuit between pin-8 – FG
Hopping motor Remove the MOTERCL connector of the CU/
PU board and check that approx. 3.4Ω can
be measured between pin-5 -pin-6 and pin-7
-pin-8 respectively at the cable end.
45850101TH Rev.1
Actions to be taken
Check work
at NG
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
hopping motor.

(3-2-3) Paper unloading jam occurs after a paper is taken into printer.

Check item
(3-2-3-1) Check condition of the paper running path
Face Up Stacker Confirm that it is either fully opened or fully
Cover closed
Duplex pull-in gate Confirm that the Duplex pull-in gate works
normally by using the Motor & Clutch Test of the
self-diagnostic mode.
Is it set to the paper unloading side normally?
Rear panel Check that the installation condition of the rear
panel hampers smooth movement of a paper in
the paper running path, or not.
Paper running path Check that any mechanical load does not exist
of unloading unit that hampers the smooth movement of paper in
the paper running path of the paper unloading
unit, by the visual inspection.
Check if the paper unloading motor becomes
difficult to rotate or not.
(3-2-3-2) Check condition of the mechanical parts
Sensor lever of the Check if shape and movement of the sensor
exit sensor and that levers have any abnormality or not.
of the exit2 sensor
(3-2-3-3) 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.
2. TROUBLESHOOTING PROCEDURES
Actions to be taken
Check work
at NG
Eliminate any
in-between
condition of the
cover between
the fully open
position and fully
closed position.
Replace the
Duplex pull-
in gate or the
Duplex solenoid
Remove the rear
panel and re-
install it.
Correct the
portion that
becomes
mechanical load.
Replace the
sensor lever with
the good sensor
lever.
Replace the CU/
PU board or
fuser motor or
fuser unit.
If any attempt of
using new fuser
unit as a trial
is going to be
made, be sure to
use the System
Maintenance
Menu FUSE
KEEP MODE.
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