Service manual

7-35
CHAPTER 7 TROUBLESHOOTING PROCEDURES
(4) Paper Feed Jam (Error 390:Multi-purpose Tray)
(4-1)Paper feed jam occurs right after turning on the power (Multi-purpose Tray)
Paper running route in front
unit
Check the sensor levers of
inlet sensor 2 and WR sensor.
Check the state of sensor
signal detection.
Check the output levels of
inlet sensor 2 and WR sensor.
Check the power supply of
the front sensor PCB (RSF
PCB).
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.
Use the SWITCH SCAN function of the self-diagnostic mode to
check to see if the sensor signal is detected normally.
Check the following signals through the FSNS connector of the
PU PCB (PRX PCB).
Pin 2: WR sensor
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: 5-V power
Pin 1: 0VL
Action at NG
Remove the jammed
paper.
Replace the sensor
lever with a normal
one.
Replace the PU PCB
(PRX PCB), front
sensor PCB (RSF
PCB) or the connection
cord.
Replace the front
sensor PCB (RSF
PCB).
Replace the connection
cord.
(4-1-2) Check of state of mechanical parts
(4-1-1) Check of state of running route
(4-1-3) Check of electrical parts
Confirmation Items