Paper Feed Jam Occurs Right After Paper Feeding Starts (Multi-Purpose Tray) - Oki c5550 Maintenance Manual

(4-2) Paper feed jam occurs right after paper feeding starts (Multi-purpose Tray)

Confirmation Items
(4-2-1) Check of state of running route
Paper running route in
multi-purpose tray
Sheet receive (reed) of
multi-purpose tray
(4-2-2) Confirm condition of mechanical parts
Check sensor levers at the
entrance sensor 2 and
WR sensor lever
Planetary gears for paper
feed control
Front cover
(4-2-3) Check of the operating state of motors
Feed motor
Feed motor driver
(4-2-4) Check of connections
Feed motor drive cord
Cord to drive a paper feed
motor
Feed motor
44158801TH Rev.2
Confirmation Tasks
Check to see if there is paper jammed on the running
route.
Check to see if the sheet receive is always located in the
upper position.
Check to see if the sensor levers demonstrate any
abnormal shape or motion.
Conduct the Motor and Clutch Test of the self-diagnostic
mode, and actuate the feed motor (FRONT MOTOR) to
make sure that both of the planetary gears rotate in their
lower positions. (The planetary gear box is the right-hand
white molded section, which is accessible by opening
the front cover.)
Check to see if the right and left locks of the front cover
are properly locked.
Conduct the Motor and Clutch Test of the self-diagnostic
mode, and check to see if the feed motor operates
normally.
Unplug the HOP connector of the PU PCB (PRF PCB),
and confirm the following on the connector side:
Several Mohms between pin 1 and FG
Several Mohms between pin 2 and FG
Several Mohms between pin 3 and FG
Several Mohms between pin 4 and FG
Check a connection status of the cord.
HOPKID connector of the PU board (PRF PCB).
Check half connection, incomplete plug-in or installation
status of the cord by eyes.
Check to make sure that the cord is not caught under any
assembled part of the printer. Unplug the HOP connector
of the PU PCB (PRF PCB), and confirm the following on
the cord side:
Short-circuiting between pin 1 and FG
Short-circuiting between pin 2 and FG
Short-circuiting between pin 3 and FG
Short-circuiting between pin 4 and FG
Confirm 3.5 of resistance is seen between 5pin-6pin,
and 7pin-8pin each at the cord side after pulling out
HOPKID connector of the PU board (PRF PCB).
Oki Data CONFIDENTIAL
Action at NG
Remove the jammed
paper.
Modify the tray,
so that the sheet
receive will be raised
to the prescribed
position.
Replace the sensor
lever with a normal
one.
Replace the
planetary gear box.
Replace the front
unit.
Exchange a PU
board (PRF PCB) or
paper feed motor.
Exchange a PU
board (PRF PCB)
Correct the
connection properly.
Replace the cord
with a normal one.
Return the
installation to a right
status by exchanging
a cord.
Replace the feed
motor
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