Sharp AL-800, AL-840, Digital Copier service manual System diagram, CPU IC5

Page 20

(4) System diagram

Scanning mirror

No. 1 - 4 mirror

Main charger brush

Laser beam

Laser unit

Toner

Developing	DC-310V
roller

MCU PWB

Image data

High voltage power PWB

–310V/+200V selection

DC –310V

DC +200V

Photoconductor drum

Discharge brush

Transfer charger roller

Separation electrode

DC-200V

Paper

DC +3.5KV

AC600V(P-P)

DC –850V

DC-850V

AC600V(P-P)

DC+500V

(5) Operation

a. Wiring diagram

MCU(PCU) PWB

		CN6
	TSIN	3	GND
	TSIN	2	TSIN	Toner sensor
		2	TSIN	Toner sensor
	+5V	1

ASIC

(IC8)

MCON

High voltage power PWB

Charger brush

CPU (IC5)

TC/Bias ON

PWNSIN

Driver I

C801

Q804

+24VP

+24VP

Q806

Q807

Q803

Q808

T801

transformer

T802

transformer

MC

CB Discharge brush

DRUM OPC drum

EARTH

	Separation electrode
TC
	Transfer charger roller
DC	100V
DC
Bias	Supply roller
	Supply roller
	Developing roller
	Earth sheet

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Contents Model AL-800/840 Operating Principle Fusing/paper exit section High voltage power PWBPower PWB Scanner read sectionImage process and data flow Copy modePaper path and imaging Data Flow Diagram Printer modePaper feed, paper transport section OutlineMajor parts PUSPE Sensor Pemp PUSPIN Sensor Paper SizeOperation Paper release operation Scanner reading section Mhps CCD CCD OUTCCD SensorWiring diagram Asic IC8 Mcupcu PWBBlock diagram Scanner writing sectionICU PWB SyncMcupcu PWB LSU PWB Image process section Image forming process diagram Photoconductor section OPCDevelopment section Transfer/separation section System diagram CPU IC5Photoconductor drum unit Developing unitTransfer charger roller Separation electrodeActual image forming process Paper Transfer roller Residual toner OPC drum OPC drum surface potential and developing bias OPC drum surface potentialRTH Fusing/paper exit sectionModel AC Power Hlon HLLComp AMP CN2Wiring diagram Drive sectionAsic CPU IC5 MEN MMT0 MMT1Electrical section Major sections operations and functionsCopy lamp control PWB Operation PWB High voltage power PWBPower PWB Copyright 1998 by Sharp Corporation

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