Samsung ProXpress M453x series Service Manual page 193

10)Check if the thermistor connector on the main board is connected properly.
11) Check if the FDB connector is connected properly.
12)Check if the voltage in user environment is in this range (80V ~ 140V, 160V ~ 260V).
13)If there is no problems for above steps, update the firmware.
14)Replace the FDB(JC44-00204A(220V)/JC44-00203A(110V)).
If the problem persists, replace the SMPS(JC44-00092C(220V)/JC44-00091C(110V))
If the problem persists, replace the main board.
Copyright© 1995-2017 SAMSUNG. All rights reserved.
4. Troubleshooting
4-98