Sharp AL-840, Digital Copier, AL-800 AC Power, Hlon HLL, Comp, AMP CN2, GND RTH Rthn, Driver

Page 27

(3) Operation

a. Wiring diagram

CPU

(IC5)

ASIC (IC202)

MCU(PCU) PWB

POWER SUPPLY PWB

 

Fusing section

 

AC POWER IN

 

Temperature fuse

 

CN603

 

(132 C)

HLON

HLON-

HLL

 

 

1/3

 

Gate

 

 

Temperature fuse

 

 

 

(187 C)

 

 

 

 

Heater

 

 

 

 

lamp

RTH

 

 

 

CN603

 

 

 

 

 

COMP

 

PR

2/4 HLN

 

 

 

 

 

 

 

AMP

CN2

 

 

Thermistor

 

GND

1

 

RTH

 

RTHN 2

 

PR

 

 

 

 

 

 

 

 

 

+24V

CN801

DRIVER

 

1

+24V

 

High voltage power PWB

2

NC

 

 

 

3

+24VS

b. Operation

Heat roller:

The heat roller is made of aluminum

The heater lamp ON/OFF is controlled by the detection signal (volt-

 

tube coated with teflon to provide a good

 

separation capability.

age value) from the thermistor to maintain the heat roller surface

 

 

 

temperature at the optimum level.

Heater lamp:

A halogen lamp is used as the heater

The heat roller surface temperature is controlled to 160/155 ˚C in the

 

lamp.

 

 

print mode and to 80 ˚C in the pre-heat mode.

Pressure roller:

Silicon rubber is used to provide enough

As a protective measure in case of abnormally high temperature in

 

pressure.

 

 

the fusing section, two temperature fuses are provided in the heater

Thermistor:

A chip-type thermistor of good response

lamp power line.

 

is used to detect the heat roller surface

The heater lamp is lighted by the AC power source.

 

temperature.

 

 

 

Temperature fuse (132 ˚C): The temperature fuse (132 ˚C) is at-

 

 

tached to the fusing cover. When the

 

 

fusing cover ambient temperature be-

 

 

comes abnormally high, this fuse is

 

 

blown off.

 

Temperature fuse (187 ˚C): The temperature fuse (187 ˚C) is closely

 

 

attached to the heat roller. When the

 

 

heat roller temperature becomes abnor-

 

 

mally high, this fuse is blown off.

 

Separation pawl:

The separation pawl separates paper

 

 

from the heat roller mechanically.

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Image 27
Contents Model AL-800/840 Operating Principle Scanner read section Fusing/paper exit sectionHigh voltage power PWB Power PWBCopy mode Paper path and imagingImage process and data flow Printer mode Data Flow DiagramPUS Paper feed, paper transport sectionOutline Major partsPaper Size PE Sensor PempPUS PIN SensorOperation Paper release operation Scanner reading section Sensor MhpsCCD CCD OUT CCDAsic IC8 Mcupcu PWB Wiring diagramScanner writing section Block diagramSync Mcupcu PWB LSU PWBICU PWB Image process section Image forming process diagram OPC Photoconductor sectionDevelopment section Transfer/separation section CPU IC5 System diagramSeparation electrode Photoconductor drum unitDeveloping unit Transfer charger rollerActual image forming process Paper Transfer roller Residual toner OPC drum OPC drum surface potential OPC drum surface potential and developing biasFusing/paper exit section ModelRTH AMP CN2 AC PowerHlon HLL CompCPU IC5 MEN MMT0 MMT1 Wiring diagramDrive section AsicMajor sections operations and functions Electrical sectionHigh voltage power PWB Power PWBCopy lamp control PWB Operation PWB Copyright 1998 by Sharp Corporation
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