Samsung ML-451 Series Service Manual page 165

► Error Code
H2–1720
H2–1721
► Error message
Error: #H2-1720 / Finisher Failure: #H2-1720. Check finisher
Error: #H2-1721 / Finisher Failure: #H2-1721. Check finisher
► Symptom
Rear Jogger Home Sensor, Rear Jogger Motor harness connection not well or damaged, Main Board damaged.
► Troubleshooting method
1) Check the Main Board Harness Connection.
2) Check the Finisher Rear Jogger Home Sensor's harness connection.
3) Check the Finisher Rear Jogger Motor's harness connection and operation.
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4. Alignment and Troubleshooting
4-64