Samsung ML-451 Series Service Manual page 169

4. Alignment and Troubleshooting
3) Check if staples are stuck in Stapler Head area and damage of Stapler itself.
4) If the same problem happens after checking 1~3, Replace the Finisher main board.
5) If the same problem happens after checking 4, Replace the Finisher Stapler.
6) If the same problem happens after checking 5, Replace the Finisher harnesses.
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