Oki C810 Maintenance Manual page 182

Oki Data CONFIDENTIAL
(5-2) Paper feed jam occurs right after paper feeding starts (Multi-purpose Tray)
Confirmation Items
(5-2-1) Check of state of running route

Paper running route Check to see if there is paper jammed on the
in multi-purpose running route.

Sheet receive of Check to see if the sheet receive is always
multi-purpose tray located in the upper position.
(5-2-2) Confirm condition of mechanical parts
Check sensor levers Check to see if the sensor levers demonstrate
at the entrance any abnormal shape or motion.
sensor 2 and WR
sensor lever
Planetary gears for Conduct the Motor and Clutch Test of the self-
paper feed control 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.)

Front cover Check to see if the right and left locks of the
front cover are properly locked.
Check if any foreign materials such as paper
Check the paper
feed roller and the dust on the surface of the feed roller or of the
pickup roller. pickup roller or not.
Check if the feed roller has worn out or not.
44072903TH Rev.1
Confirmation Tasks 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 cover Assy.
Remove the
foreign material.
Replace the feed
roller.
Confirmation Items Confirmation Tasks
(5-2-3) Check of the operating state of motors
  Conduct the Motor and Clutch Test of the self-
Feed motor
diagnostic mode, and check to see if the feed
motor operates normally.
Unplug the HOPIDUP connector ① of the PU
Feed motor driver
PCB, and confirm the following on the connector
side:
Several MΩ between pin 1 and FG
Several MΩ between pin 2 and FG
Several MΩ between pin 3 and FG
Several MΩ between pin 4 and FG
(5-2-4) Check of connections
Feed motor drive Check a connection status of the cord.
cord
HOPIDUP connector
Check half connection, incomplete plug-in or
installation status of the cord by eyes.
Cord to drive a Check to make sure that the cord is not caught
paper feed motor under any assembled part of the printer. Unplug
the HOPIDUP connector
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
Feed motor Confirm 3.4Ω or 5Ω of resistance is seen
between 1pin-2pin, and 3pin-4pin each at the
cord side after pulling out HOPIDUP connector
①
of the PU board.
7. TROUBLESHOOTING PROCEFRURES
Action at NG
Exchange a PU
board or paper
feed motor.
Exchange a PU
board.

Correct the
①
connection
of the PU board.
properly.
Replace the
cord with a
normal one.

FG_Return the
installation to a
①
of the PU PCB, and right status by
exchanging a
cord.
Replace the
feed motor
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