Troubleshooting - Samsung SCX-4720F Service Manual

7
7

7. Troubleshooting

7.1 Paper Feed problems – Causes and Solutions
7.1.1 Wrong Print Position
• Description
A defective feed sensor actuator can cause incorrect
timing.
7.1.2 JAM 0
• Description
L S U
Fuser
CR
DR
OPC
EXIT PR
Sensor
PTL
TR
Empty Sensor
Samsung Electronics
Printing begins when the paper is in the wrong position.
Check and Cause
1. Paper does not exit from the cassette.
2. Jam-0 occurs when the paper feeds into the printer.
Check and Cause
1. Check the Solenoid by using Tech
Mode.
Toner Cartridge
SR
MP Sensor
Feed
FR
Sensor
2. Check cassette/MP knock-up plate
and springs.
3. Check paper separator pad
4. Check the pick up roller for
contamination and correct assembly.
5. If continuous clusters occur, check all
rollers between pickup and registration
sensor.
6 If the paper feeds into the printer and
Jam 0 occurs, perform Tech Mode to
check feed sensor.
Solution
Replace the defective actuator
1. Replace the solenoid.
2. Repair / replace as required
3 Clean with soft cloth dampened with
IPA (Isopropyl Alcohol) or water.
Replace if required.
4. Clean with soft cloth dampened with
IPA (Isopropyl Alcohol) or water.
Replace if required
5. Ensure all rollers are clean and free to
operate correctly.
6. Check the SMPS PBA, Main PBA and
all connections. Replace any faulty
parts or the
Troubleshooting
Solution
Service Manual
7-1