45530603TH Rev.2
4-63
Oki Data CONFIDENTIAL
4. TROUBLESHOOTING PROCEDURE
(4-2)
Jam occurs immediately after the paper feed is started. (1st tray)
Check item
Check work
Actions to be taken
at NG
(4-2-1) Check condition of the paper running path
Paper running path
of the 1st tray unit
Check if paper is jammed or not in the paper
running path.
Remove the
jammed paper.
(4-2-2) Check condition of the mechanical parts
Check the sensor
lever of the 1st tray
paper entrance
sensor.
Check if shape and movement of the sensor
levers have any abnormality or not.
Replace with a
normal sensor
lever.
Check the feed
roller, pickup roller
and the retard roller
of the tray.
Check if any foreign materials such as paper
dust on the surface of the feed roller or of the
pickup roller or not.
Remove the
foreign material.
Check if the feed roller or the pickup roller has
worn out or not.
Replace the
feed roller, the
pickup roller and
the retard roller
of the tray.
(4-2-3) Motor operation check
Hopping motor
Confirm that the hopping motor works
normally by using the Motor & Clutch Test of
the self-diagnostic mode.
Replace the
PU/CU PCB or
hopping motor.
Hopping motor
driver
Remove the HOPM connector of the PU/CU
PCB and check the following at the connector
side.
1 M
:
or more between pin-1/-2/-3/-4 and FG
Replace the PU/
CU PCB.
Check item
Check work
Actions to be taken
at NG
(4-2-4) Check the system connection
Hopping motor
drive cable
Check the connection condition of the cable.
Visually 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.
Also check that cables are assembled without
any abnormality.
Normalize the
connection
condition.
Replace with a
normal cable.
Hopping motor
drive cable
Check that any cable is not pinched during
assembling of the printer.
Remove the HOPM connector of the PU/CU
PCB and check the following at the cable side.
Short circuit between pin-1/-2/-3/-4 and FG
Replace the
cable and
normalize the
assembled
condition.
Hopping motor
Remove the HOPM connector of the PU/CU
PCB and check that a resistance of 10
:
or
less can be measured between pin-1 and pin-
2 and pin-3 and pin-4 respectively at the cable
side.
Replace the
hopping motor.
(4-2-5) Clutch operation check
Paper feed clutch,
registration clutch
Check to make sure that the paper feed clutch
or registration clutch works normally by using
the Motor & Clutch Test of the self-diagnostic
mode.
Open the Tray 1 side cover so that the rollers
can be seen to check.
Replace the
PU/CU PCB,
or either paper
feed clutch or
registration
clutch.
(4-2-6) Check the system connection
Clutch cable for
paper feed
Check the connection condition of the cable.
Visually 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.
Also check that cables are assembled without
any abnormality.
Normalize the
connection
condition.
Replace with a
normal cable.
Cable for paper
feed clutch
Check that any cable is not pinched during
assembling of the printer.
Remove the HOPCL connector of the PU/CU
PCB and check the following at the cable side.
Short circuit between pin-1 – FG
Remove the HOPCL connector of the PU/CU
PCB and check that approx. 240
:
can be
measured between pin-1 and pin-2.
Replace the
clutch and
assembly it
again correctly.