Service manual

4. Alignment and Troubleshooting
Service Manual
ML-551x / 651x series
4-95
Samsung Electronics
 Code
H2-4400
 Error message
Paper jam in front of bin 3. Remove paper
 Symptom / Cause
Mailbox Bin 3 Exit Sensor doesn’t turn on after a paper entered Mailbox.
IOT Exit Roller grabs the paper. Or Mailbox Feeding Motor Stops. Or Mailbox Entrance Exit Sensor damaged or
Mailbox Gate doesn’t work or harness damaged. Or Mailbox Main Board damaged.
 Troubleshooting method
1. Check Jam Occurrence in IOT.
- If the IOT roller is grabbing the paper, it’s IOT
fault.
2. Check Mailbox Main Board Harness connection.
3. Check Mailbox Exit-related Sensors operation &
harness connection.
4. Check Mailbox Feeding Motor Harness
Connection and operation.
5. Referring to Upper Diverter Fault, check the
Upper Diverter’s operation.
6. Referring to Lower Diverter Fault, check the
Lower Diverter’s operation
7. If the same problem happens after checking 1~6,
replace the mailbox main board.
8. If the same problem happens after checking 7,
replace the mailbox harnesses.