Samsung ML-2150 Service Manual page 40

4.5.4 Fusing
The temperature change of the heat roller's surface is changed to the resistance value through the thermistor. By con-
verting 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 controlling the fusing, the error stated in the table occurs. (For the
domestic model, the Q-PID method has been applied.)
Error
Open Heat Error
Lower Heat Error
Over Heat Error
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 sta-
tus 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
Polygon motor error
Hsync error
Samsung Electronics
Description
When warming up, it has been lower
than 68°C over 28 seconds
• Standby:
It has been lower than 130°C over 10 seconds
• Printing:
- 3 consecutive page; it has been 20°C lower
than the fixed fusing temperature over 7 seconds.
It have been higher than 230°C over 10 seconds
When the polygon motor's speed doesn't
become a normal
The polygon motor's speed is normal,
but the Hsync signal is not created.
Engine Fuser Error
Engine Fuser Low Heat Error
Engine Fuser Over Heat Error
Description
Summary of Product
LCD Display
LCD
Engine LSUError
HSYNC Error
Service Manual
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