5) Paper Feed Jam (Error Code 390: Multipurpose Tray); Jam Occurs Immediately After The Power Is Turned On; (Multipurpose Tray) - Oki MC860 Maintenance Manual

Oki Data CONFIDENTIAL
Check item
(4-2-4) Check the system connection
Paper feed motor Check the connection condition of the
drive cable cables.
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 HOPSIZE connector
PU PCB and check the followings at the
cable side.
Short circuit between pin1 – FG
Short circuit between pin2 – FG
Short circuit between pin3 – FG
Short circuit between pin4 – FG
Paper feed motor Remove the HOPSIZE connector
PU PCB and check that approx. 3.4 ohms
can be measured between pin1 -pin-2 at
the cable end, and that approx. 5 ohms
can be measured between pin3 -pin-4
respectively.
43967002TH Rev. 1
Check work Action to be taken at NG
Normalize the
connection
condition.
Replace the cable
with the normal
cable.
Replace the cable
with the good one
of the that normalizes
the connection
condition.
of the Replace the paper
feed motor.

7.5.2.(5) Paper feed jam (error code 390: Multipurpose tray)

(5-1) Jam occurs immediately after the power is turned on. (Multipurpose tray)
Check item
(5-1-1) Check the condition of the paper running path
Paper running path Check if paper is jammed or not in the
of the multipurpose paper running path.
tray
(5-1-2) Check condition of the mechanical parts
Check the sensor Check if shape and movement of the
levers of the paper sensor levers have any abnormality or not.
entrance sensor 2
and the WR sensor.
(5-1-3) Check condition of electrical parts
Check the detection Confirm that the sensor signals are
condition of the normally detected by using the SWITCH
sensor signal. SCAN function of the self-diagnostic mode.
Check the sensor Check for the following signals at the FSNS
output signal level of connector
the paper entrance
pin2: WR sensor
sensor 2 and the
pin3: Entrance sensor 2
WR sensor.
Confirm that the above signal levels change
when the sensor lever is operated.
Check the power Check the 5V power at the FSNS connector
voltages supplied of the front sensor PCB (RSF PCB).
to the front sensor
pin1: 5V power
PCB (RSF PCB)
pin5: 0VL
Check work Action to be taken at NG
Remove the
jammed paper.
Replace the sensor
lever with the good
sensor lever.
Replace either the
PU PCB or the front
sensor PCB (RSF
PCB) or connection
cable.
Replace the front
of the PU PCB. sensor PCB (RSF
PCB)
Replace the
connection cable.
7. Troubleshooting
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