Jam Occurs Immediately After Paper Feed Is Started; Multipurpose Tray - Oki MC760 Maintenance Manual

(5-2) Jam occurs immediately after paper feed is started. (Multipurpose tray)
Check item
(5-2-1) Check condition of the paper running path
Paper running path Check if paper is jammed or not in the paper
of the multipurpose running path.
tray
Sheet Receive of the Confirm that the Sheet Receive has moved up

multipurpose tray

normally.
Confirm that the support spindle and spring of
the Sheet Receive have been installed in the
specified positions normally.
Check the Open the multipurpose tray and check the paper
paper guide of guide position
multipurpose tray
(5-2-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the sensor
levers of the paper levers have any abnormality or not.
entrance sensor 2
and the WR sensor.
Planetary gear for Rotate the paper feed motor (FRONT MOTOR)
paper feed control using the Motor & Clutch Test of the self-
diagnostic mode, and confirm that both of the
two planetary gears rotate at the bottom position.
(The planetary gear box can be located because
it is the white molded block that is located on the
right side when the front cover is opened.)
Front cover Confirm that the locks in the right and left of the
front cover are locked normally.
Check the feed roller Check if any foreign materials such as paper
dust on the surface of the feed roller or of the
and the pickup roller.
pickup roller or not.
Check if the feed roller has worn out or not.
Action to be taken
Check work
at NG
Remove the
jammed paper.
Correct
installation of
the above parts
so that the
Sheet Receive
moves up to
the specified
position
normally.
Set the paper
guide to correct
position
Replace the
sensor with the
good sensor
lever.
Replace the
planetary gear
box
Replace the font
cover assembly
Remove the
foreign material.
Replace the feed
roller.
Check item
(5-2-3) Motor operation check
Paper feed motor Confirm that the paper feed motor works
normally by using the Motor & Clutch Test of the
self-diagnostic mode.
Paper feed motor Remove the HP_PSZCL connector
driver board and check the followings at the connector
side.
Several MΩ between pin-1 – FG
Several MΩ between pin-2 – FG
Several MΩ between pin-3 – FG
Several MΩ between pin-4 – FG
(5-2-4) Check the system connection
Paper feed 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.
Paper feed motor Check that any cable is not pinched during
drive cable assembling of the printer.
Remove the HP_PSZCL connector
board and check the followings at the cable side.
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Paper feed motor Remove the HP_PSZCL connector
PU board and check that approx. 3.4Ω can be
measured between pin-1 -pin-2, and that approx.
5Ω can be measured between pin-3 -pin-4
respectively.
7. Troubleshooting and repair procedure
Action to be taken
Check work
at NG
Replace the PU
board, or replace
the paper feed
motor.
of the PU Replace the PU
board.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
cable with the
of the PU good cable
that normalizes
the connection
condition.
of the Replace the
paper feed
motor.
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