Sharp AL-800, AL-840, Digital Copier service manual Fusing/paper exit section, Model, Rth

E. Fusing/paper exit section

(1) Outline

Toner attracted to the paper in the transfer section is fused by heat and pressure of the heat roller. The heat roller is of thin aluminum roller which is high heat conductivity, minimizing the warm up time. The heat roller surface temperature is detected by the fusing temperature sensor to maintain the fusing temperature at a constant level (160/155 ˚C).

(2) Major parts

6)

2) POUT

3)

4)

5)

11)

7)

11)

8)

8)

7)

1)

9)

4)

2) POUT

5)	9)	10)
	9)
	10)

1)

6)

3) 11)

No.				Parts			MODEL	Note
	Code	Signal name	Name	Type	Function/operation	Active condition
1			Heat roller		Heats toner on the paper and	LOW (0V) when
					fuses onto the paper.	paper is
						detected.
2	POUT	POUT IN	Paper exit detector	Photo transmission	Detects paper exit.
				sensor
3		RTH IN	Fusing temperature	Thermistor	Detects the heat roller
			sensor		surface temperature.
4			Temperature fuse 1	Mold	Assures safety in overheating.
			(Fusing section)
5			Temperature fuse 2	Mold	Assures safety in overheating.
			(Fusing section)
6		HL	Heater lamp	Halogen lamp	Heats the heat roller.		100V series	10V 500W
							120V series	120V 500W
							200V series	230V 500W
7			Pressure roller		Applies a pressure to the
					heat roller and paper to
					improve fusing efficiency.
8			Paper exit roller		Discharges paper after fusing.
9			Separation pawl		Separates paper from the
					fusing roller mechanically.
10			Paper exit roller		Discharges paper outside the
					machine after fusing.
11			Pressure spring		Applies a pressure to the
					heat roller, paper, and
					pressure roller to improve
					transfer efficiency.

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