Samsung ML-1665 Service Manual page 70

Alignment and Troubleshooting
4) No Power
Description : When system power is turned on, all lamps on the operator panel do not come on.
1. Check if the flat cable
between the main board and
Reconnect the flat cable.
HVPS/SMPS board is connected
correctly.
2. Check if the HVPS/SMPS
Replace the HVPS/SMPS board.
output is normal.
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Service Manual
Samsung Electronics