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SUMMARY OF PRODUCT
Samsung Electronics
Service Manual
4.5.4 Fusing
The temperature change of the heat roller’s surface is changed to the resistance value through the thermis-
tor. 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 controlled by comparing the target temperature to
the value from the thermistor. If the value from the thermistor is out of the controlling range while control-
ling the fusing, the error stated in the table occurs. (For the domestic model, the Q-PID method has been
applied.)
4.5.4.1 Error Type
4.5.5 LSU
The LSU is consisted of the LD (Laser Diode) and the polygon motor control. When the printing signal
occurs, it turns the LD and drives the polygon motor. When the receiving light part detects the beam,
Hsync occurs. When the polygon motor speed becomes a normal, LReady occurs. If two conditions are
satisfied, the status bit of the LSU controller register becomes 1 to be judged that the LSU is ready. If two
conditions are not satisfied, the error shown in below occurs.
Error Description
Open heat error When warming up, it has been lower than 68°C over 28 seconds
Lower heat error • Standby:
It has been lower than 80°C over 10 seconds
• Printing:
- 2 consecutive pages: it has been lower than 145°C over 4 seconds.
- 3 consecutive page; it has been 25°C lower than the fixed fusing temperature
over 4 seconds.
Over heat error It have been higher than 220°C over 3 seconds
Error Description
Polygon motor error When the polygon motor’s speed doesn’t become a normal
Hsync error The polygon motor’s speed is normal, but the Hsync signal is not created.
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