Summary of Product
Service Manual
3-21
Samsung Electronics
3.3.3.1.4 Fusing
The temperature change of the heat roller°Øs surface is changed to the resistance value through the thermistor.
By converting the voltage value, which impressed to the resistance, to the digital value through the AD converter,
the temperature is decided. The AC power is controller by comparing the target temperature to the value from the
thermistor. If the value from the thermistor is out of controlling range while controlling the fusing, the error stated
in the below table occurs.
• Lamp Method
=>This can be changed in the future.
3.3.3.1.5 LSU
The LSU is consisted of the LD (Laser Diode) and the polygon motor control. When the printing signal occurs, it
turns on the LD and drives the polygon motor. When the detector detects the beam, Hsync occurs. When the
polygon motor speed becomes strady, Lready occurs. If two conditions are satisfied, the status are not satisfied,
the error shown in below occurs.
Error Description LCD Display
OPEN HEAT ERROR - When warming up, it has been lower than 60
ENGINE FUSER ERROR
over 35 seconds
LOW HEAT ERROR - StandbyIt has been lower than 130
over 10 seconds
ENGINE LOW HEAT ERROR”
- Printing
Up to 2 consecutive pages :
It has been lower than 155
over 7 seconds.
From 3 consecutive pages :
It has been 25
lower than the fixed fusing
temperature over 7 seconds.
OVER HEAT ERROR It has been higher than 230
over 10 seconds
ENGINE OVERHEAT ERROR”
Error Type Description LCD Display
Polygon Motor Error Whenthe polygon motor speed doesn t become steady LSU NOT READY
Hsync Error The polygon motor speed is steady but the Hsync is not generated HSYNC ERROR
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