Samsung ML-1640 Service Manual page 80

3) Paper Empty
• Description The paper lamp on the operator panel is on even when paper is loaded in the cassette.
1. Bending or deformation of
the actuator of the paper sensor.
2. The function of the engine
board is defective Perform DCU mode :
Perform DCU diagnostic
Service Manual
Alignment & Troubleshooting
code 8.
Replace the defective actuator.
Replace the engine board.
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Samsung Electronics