44346001TH Rev.1
164 /
Oki Data CONFIDENTIAL
7. TROUBLESHOOTING
(4-2) Jam occurs immediately after the paper feed is started.
Check item
Check operation
Actions for NG
results
(4-2-1) Check condition of the paper running path
Paper running path of
the front 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
Hopping sensor,
IN sensor and WR
sensor lever check
Check the sensor lever shapes and operations
for any problem
Replace the
sensor lever(s)
with proper
one(s).
(4-2-3) Motor operation check
Paper feed motor
Confirm that the paper feed motor works normally
by using the Motor & Clutch Test of the self-
diagnostic mode.
Replace the CU/
PU board or the
feed motor.
Paper feed motor
driver
Pull out the CU/PU board HOP connector
1, and check the following at the side of the
connector:
Several M between pin-1 – FG
Several M between pin-2 – FG
Several M between pin-3 – FG
Several M between pin-4 – FG
Replace the
CU/PU board.
(4-2-4) Check the system connection
Paper feed motor
drive cable
Check the connection condition of the 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.
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Paper feed motor
drive cable
Check that any cable is not pinched during
assembling of the printer.
Pull out the CU/PU board HOP connector 1,
and check the following at side of the cord:
Short circuit between pin-1 – FG
Short circuit between pin-2 – FG
Short circuit between pin-3 – FG
Short circuit between pin-4 – FG
Replace the
cable with the
good cable
that normalizes
the connection
condition.
Paper feed motor
Pull out the CU/PU board HOP connector 1,
and check whether there is a resistance of
approximately 3.4 or 5 between the pins 1
and 2, and between the pins 3 and 4, at the
cord side.
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
Check operation
Actions for NG
results
(5-1-1) Check condition of the paper running path
Paper running path
of the multipurpose
tray
Check if paper is jammed or not in the paper
running path.
Remove the
jammed paper.
(5-1-2) Check condition of the mechanical parts
IN sensor and WR
sensor lever check
Check the sensor lever shapes and operations
for any problem
Replace the
sensor lever(s)
with proper
one(s)
(5-1-3) Check condition of electrical parts
Check the detection
condition of the
sensor signal.
Confirm that the sensor signals are normally
detected by using the SWITCH SCAN function
of the self-diagnostic mode.
Replace the
CU/PU board,
or appropriate
sensor(s) or
connection
cord(s).
In sensor and WR
sensor output level
check
Check the following signals by using the CU/
PU board RGSNS connector 16:
Pin 2: WR sensor
Pin 5: IN sensor
Confirm that the above signal levels change
when the sensor lever is operated.
Replace the
connection
cable.
