Samsung SCX-4720F Service Manual page 103

Troubleshooting
7.1.3 JAM 1
1. Recording paper is jammed in front of or inside the fuser.
2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the
• Description
Actuator-Feed.
L S U
Fuser
Toner Cartridge
CR
DR
OPC SR
EXIT PR
Sensor
PTL
Feed
TR FR
Sensor
Empty Sensor
7.1.4 JAM 2
1. Recording paper is jammed in front of or inside the fuser.
• Description 2. Recording paper is stuck in the discharge roller and in the fuser just after passing through the
Actuator-Feed.
L S U
Fuser
Toner Cartridge
CR
DR
OPC SR
EXIT
PR
Sensor
PTL
Feed
TR Sensor FR
Empty Sensor
Service Manual
7-2
Check and Cause
1. If the recording paper is jammed in
front of or inside the fuser.
MP Sensor
2. If the recording paper is stuck in the
discharge roller and the fuser just
after passing through the Actuator-
Feed, Feed Actuator may be defec
tive.
Check and Cause
1. If the paper is completely fed out of
the printer, but Jam 2 occurs: The
Exit sensor may be defective.
MP Sensor
• After the paper is completely
discharged the Exit sensor actuator
should return to its original position
to shut the photo-sensor. It may
stick open or return only slowly due
to contamination be paper debris or
foreign objects.
2. If the paper is rolled in the Fuser
Roller:
• This occurs when a Guide claw is
broken away, damaged or
deformed.
• It occurs when the Spring of a
Guide claw is broken or damaged.
• It occurs when the Heat-Roller or
Pressure-Roller is seriously
contaminated with toner.
Solution
1. Replace the SMPS.
2. Reassemble the Actuator-Feed and
Spring-Actuator if the return is bad.
Solution
1. Check if the exit sensor actuator is
defective.
• Check if the actuator exit is deformed
(Check if the lever part is deformed).
• Check whether burrs occur in the
assembly part of the exit actuator
and if the actuator operates smoothly.
• Check if foreign objects or paper
debris are preventing the correct
operation of the actuator.
2. If the paper is stuck in the fuser :
disassemble the fuser and remove the
jammed paper, and clean the surface
of the pressure roller with dry gauze.
Check all ribs, claws and springs.
Samsung Electronics