Service manual

4. Alignment and Troubleshooting
Service Manual
ML-551x / 651x series
4-122
Samsung Electronics
 Code
U1-2320
 Error message
Fuser Unit Failure: #U1-2320. Turn off then on
 Symptom / Cause
The fuser unit is not installed or AC is not supplied to the Heat Lamp.
Thermistor is defective.
 Troubleshooting method
1. Check if the fuser unit is installed properly. Turn the machine off then on.
2. Remove the fuser unit. Remove the COVER-UPPER. And measure the thermostat continuity.
Check if the thermostat is opened.
3. Measure the LAMP-HALOGEN resistance value from the center and both sides.
Check if it has the continuity.