Samsung SF-530 Service Manual page 63

Troubleshooting
Fuser Error
Measure the resistance
at the both ends of AC
Line with covers open
Less than 10W?
YES
Remove the covers
AC is being supplied?
YES
The voltage
of pin #208 of U5
(CPU) on the Main board
is about 2.3V when
printing?
YES
END
4-30
NO
Thermostat is open due to the heat etc.
-> Replace the thermostat
NO
Re-assemble the top
cover and close it
Thermistor, connecting point or engine
NO
board defect -> Repair/replace the
component/board
Check the PCI and fusing
control part and CN502
on the SMPS
-> Replace the component
or replace the SMPS
Samsung Electronics