Paper Feed Jam(Error 391:1St Tray); Paper Feed Jam Occurs Right After Turning On The Power (1St Tray); Paper Feed Jam Occurs Right After Paper Feeding Starts (1St Tray) - Oki c5550 Maintenance Manual

8.5.2.(3)

Paper Feed Jam(Error 391:1st Tray)

(3-1) Paper feed jam occurs right after turning on the power (1st Tray)

Confirmation Items
(3-1-1) Check of state of running route
Paper running route in front
unit
(3-1-2) Check of state of mechanical parts
Check the sensor levers of
inlet sensors 1 and 2.
(3-1-3) Check of electrical parts
Check the state of sensor
signal detection.
Check the output levels of
inlet sensors 1 and 2
Check the power supply of
the front sensor PCB (RSF
PCB).

(3-2) Paper feed jam occurs right after paper feeding starts (1st Tray)

Confirmation Items
(3-2-1) Check of state of running route
Paper running route in front
unit
(3-2-2) Check of state of mechanical parts
Check the sensor levers of
inlet sensors 1 and 2.
(3-2-3) Check of operating state of motors
Feed motor
Feed motor driver
44158801TH Rev.2
Confirmation Tasks
Open the front cover, and check to see if there is paper
jammed on the running route.
Check to see if the sensor levers demonstrate any
abnormal shape or motion.
Use the SWITCH SCAN function of the Maintenance
Menu to check to see if the sensor signal is detected
normally.
Check the following signals through the FSNS connector
of the PU PCB (PRF PCB).
Pin 4: Inlet sensor 1
Pin 3: Inlet sensor 2
Confirm that the above signal levels vary as the sensor
levers are actuated.
Check the 5-V power through the CN connector of the
front sensor PCB (RSF PCB).
Pin 5: 5V power
Pin 1: 0VL
Confirmation Tasks
Check to see if there is paper jammed on the running
route.
Check to see if the sensor levers demonstrate any
abnormal shape or motion.
Conduct the Motor and Clutch Test of the self-diagnostic
mode, and check to see if the feed motor operates
normally.
Unplug the HOP connector of the PU PCB (PRF PCB),
and confirm the following on the connector side:
Several Mohms between pin 1 and FG
Several Mohms between pin 2 and FG
Several Mohms between pin 3 and FG
Several Mohms between pin 4 and FG
Oki Data CONFIDENTIAL
Action at NG
Remove the jammed
paper
Replace the sensor
lever with a normal
one.
Replace the PU
PCB (PRF PCB),
front sensor PCB
(RSF PCB) or the
connection cord.
Replace the front
sensor PCB (RSF
PCB).
Replace the
connection cord.
Action at NG
Remove the jammed
paper.
Replace the sensor
lever with a normal
one.
Replace the PU
PCB (PRF PCB) or
feed motor.
Replace the PU
PCB (PRF PCB).
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