Oki MC760 Maintenance Manual page 174

Oki Data CONFIDENTIAL
Check item
(3-2-4) 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 at the cable end,
and that approx. 5Ω can be measured between
pin-3 -pin-4 respectively.
(3-2-5) Solenoid operation check
Paper feed clutch Confirm that the paper feed clutch or regist
clutch works normally by using the Motor &
Clutch Test of the self-diagnostic mode.
Remove the metal plate from the right side of a
printer so that the clutch becomes visible. Then,
check operation of the clutch.
45376001TH Rev.1
Action to be taken
Check work
at NG
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.
Replace the PU
board, or replace
the paper feed
clutch or regist
clutch.
Check item
(3-2-6) Check the system connection
Paper feed clutch Check the connection condition of the cable.
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 clutch Check that any cable is not pinched during
cable assembling of the printer.
Remove the CL1 connector
and check the followings at the cable side.
Short circuit between pin-1 – FG
Remove the CL1 connector
and check that approx. 240Ω can be measured
between pin-1 and pin-2.
7. Troubleshooting and repair procedure
Action to be taken
Check work
at NG
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Replace the
solenoid and re-
of the PU board assemble the
printer correctly.
of the PU board
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