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.

 

 

 

1 – 25

Page 26
Image 26
Sharp AL-800, AL-840, Digital Copier service manual Fusing/paper exit section, Model, Rth