Service manual

4. Alignment and Troubleshooting
Service Manual
ML-551x / 651x series
4-112
Samsung Electronics
 Code
M2-2310
 Error message
Jam bottom of duplex
 Symptom / Cause
The paper has jammed in the duplex path.
1. There is any obstacles in the paper path.
2. The duplex motor is defective.
3. The duplex sensor is defective.
 Troubleshooting method
1. If there is any obstacles or contamination in the path, clean or remove it.
2. Check if the duplex motor is operated properly. If the duplex motor is defective, replace it.
3. Check if the duplex sensor is operated proerly. If the duplex sensor is defective, replace it.
 Code
M2-3120
 Error message
Install duplex unit.
 Symptom / Cause
The duplex unit is not installed properly.
1. The photo sensor for duplex unit is defective.
2. Harness connection error.
3. Duplex unit installation error.
 Troubleshooting method
1. Check if the photo sensor for duplex unit is operated properly.
2. Check if the harness is connected to the connector properly. Reconnect it.
3. Reinstall the duplex unit.