Samsung ML-451 Series Service Manual page 217

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4. Alignment and Troubleshooting
9) Check if the thermistor connector on the main board is connected properly.
10)Remove the FDB. Check the Triac short on FDB. Measure the transistor resistance for each terminal. If there is
any problem, replace the FDB.
11) If the problem persists, replace the main board. If the fuser unit is damaged, replace it with new one.
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