The Cause And Solution Of The Malfunction - Samsung ML-4550 Service Manual

Troubleshooting

6.4 The cause and solution of the malfunction

6.4.1 Fuser Error
A message "Engine Fuser Low Heat Error/Engine Fuser Over Heat Error" is displayed in a LCD
• Description
panel.
Check and Cause
1. Check whether a thermostat, open or not.
2. Check whether a thermistor is open or not.
3. Heat lamp ON/OFF test
4. It could not operate due to a gear of a fuser is
melted.
6.4.2 LSU Error
• Description
A message "Engine Hsyne Error" is displayed in a LCD panel.
Check and Cause
1. Check whether the LSU connector is disconnected or
not.
2. Check whether the LSU motor is rotating or not.
3. Check the HSYNC signal.
Service Manual
6-14
Solution
1. Replace the fuser if a thermostat is open.
2. Replace the fuser if a thermistor sensor is
located deep inside of a sponge.
3. Check whether the overheat mode circuit
operates normally or not.
4. Replace the fuser.
Solution
1. Connect the LSU harness properly.
2. Replace a LSU.
3. Replace a main board if the same error occurs
again after replacing a LSU.
Samsung Electronics