Samsung ML-2251N/XAA Service Manual page 84

Troubleshooting
7.3 Printer Faults – Causes and Solutions
7.3.1 All LEDs blinking (Fuser Error)
1. All the lamps on the operator panel blink.
• Description
2. The fuser drive gear breaks or melts.
3. When printing the motor skips or makes a noise due to a defective fuser drive gear
Check and Cause
Use EDC diagnostic code 10 to test the fuser.
1. Thermostat, fuser power cable or heat lamp is open
circuit.
2. Thermistor is faulty.
3. Drive gear melted.
7.3.2 All LEDs blinking (Scan Error)
• Description
All lamps on the OPE panel blink.
Check and Cause
Use EDC diagnostic code 05 to test the LSU.
1. LSU cable or connector faulty.
2. LSU motor is faulty.
3. Check the HSYNC signal.
Service Manual
7-12
Solution
1. Replace heat lamp or cable harness if necessary.
Replace the whole fuser assembly if the
thermostat is open circuit.
2. Carefully inspect the thermistor mounting. If the
mounting or the roller in this area is melted
replace the whole fuser assembly. If the thermistor
is faulty but there is no sign of heat damage
replace the thermistor sensor.
3. Replace the fuser.
Solution
Replace the LSU or cable harness as required.
Replace a main board if the same error persists after
replacing the LSU.
Samsung Electronics