HP (Hewlett-Packard) 9065, 9055 User Manual

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hphpLaserJet 9055 mfp

LaserJet 9065 mfp

service manual

hp LaserJet 9055mfp (Q3631A) hp LaserJet 9065mfp (Q3632A)

service manual

Reproduction, adaptation or translation without prior written permission is prohibited, except as allowed under the copyright laws.

The information contained herein is subject to change without notice.

The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.

Part number: Q3631-90908 Edition 1, 11/2003

Trademark Credits

Microsoft®, Windows®, and Windows NT® are U.S. registered trademarks of Microsoft Corporation.

1 How to use this manual

Manual contents . . . . . . . . . . . . . . . . . . . . . . . . .2

Manual organization . . . . . . . . . . . . . . . . . . . . . .2

2 Safety

Safety and important warning items . . . . . . . . . .4

Important notices. . . . . . . . . . . . . . . . . . . . . 4

Description items for Warning, Caution,

and Note . . . . . . . . . . . . . . . . . . . . . . . 4

Safety warnings. . . . . . . . . . . . . . . . . . . . . . . . . . 5

Modifications not authorized by hp . . . . . . .5

Power supply. . . . . . . . . . . . . . . . . . . . . . . . 7

Installation requirements. . . . . . . . . . . . . .10

Measures to take in case of an accident. . 15

Conclusion . . . . . . . . . . . . . . . . . . . . . . . . 15

Regulatory statements . . . . . . . . . . . . . . . . . . .16

Safety information. . . . . . . . . . . . . . . . . . . . . . . 16

Safety circuits . . . . . . . . . . . . . . . . . . . . . .16

Overall protection circuit . . . . . . . . . . . . . . 16

Safety labels on the MFPs . . . . . . . . . . . . . . . . 19

Scanner section . . . . . . . . . . . . . . . . . . . .21

Laser/scanner assembly . . . . . . . . . . . . . .21

Rear cover. . . . . . . . . . . . . . . . . . . . . . . . . 21

3 MFP overview

Overview of system. . . . . . . . . . . . . . . . . . . . . .24

hp LaserJet 9055mfp/9065mfp product

specifications. . . . . . . . . . . . . . . . . . . . . . . 25

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Functions. . . . . . . . . . . . . . . . . . . . . . . . . . 25

Applicable copy paper. . . . . . . . . . . . . . . .26

Options . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Particulars of machine. . . . . . . . . . . . . . . . 26

Maintenance and life. . . . . . . . . . . . . . . . . 26

Environmental conditions . . . . . . . . . . . . . 26

Central cross-sectional view . . . . . . . . . . . . . . . 27

Drive system diagram . . . . . . . . . . . . . . . . . . . . 28

Fuser/web drive section . . . . . . . . . . . . . .28

Drum drive section . . . . . . . . . . . . . . . . . . 29

Developing drive section . . . . . . . . . . . . . . 29

Paper feed/vertical conveyance/tray

up drive sections . . . . . . . . . . . . . . . .30

Tray 1 paper feed/automatic duplex

unit (ADU) pre-registration

drive section . . . . . . . . . . . . . . . . . . . 31

Charging and transfer/separation wire

cleaning drive section . . . . . . . . . . . . 32

Automatic Duplex Unit (ADU)

conveyance drive section . . . . . . . . . 33

Paper exit drive section . . . . . . . . . . . . . . 34

Toner supply drive section . . . . . . . . . . . . 34

Optics drive section . . . . . . . . . . . . . . . . . 35

4 MFP unit explanation

External section . . . . . . . . . . . . . . . . . . . . . . . . 40

Composition . . . . . . . . . . . . . . . . . . . . . . . 40

Drive section. . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Composition . . . . . . . . . . . . . . . . . . . . . . . 41

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 41

M2 (drum) control . . . . . . . . . . . . . . . . . . . 42

M4 (fuser) control . . . . . . . . . . . . . . . . . . . 42

Scanner section . . . . . . . . . . . . . . . . . . . . . . . . 44

Composition . . . . . . . . . . . . . . . . . . . . . . . 44

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 44

M11 (scanner) control. . . . . . . . . . . . . . . . 45

Exposure control . . . . . . . . . . . . . . . . . . . . 48

Original read control . . . . . . . . . . . . . . . . . 48

APS control. . . . . . . . . . . . . . . . . . . . . . . . 49

AE control . . . . . . . . . . . . . . . . . . . . . . . . . 51

Laser scanner unit . . . . . . . . . . . . . . . . . . . . . . 52

Composition . . . . . . . . . . . . . . . . . . . . . . . 52

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 52

M15 (polygon) control . . . . . . . . . . . . . . . . 53

Image write control . . . . . . . . . . . . . . . . . . 53

Drum unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Composition . . . . . . . . . . . . . . . . . . . . . . . 56

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 56

Separation claw control . . . . . . . . . . . . . . 57

Paper guide plate control . . . . . . . . . . . . . 57

Corona unit section. . . . . . . . . . . . . . . . . . . . . . 58

Composition . . . . . . . . . . . . . . . . . . . . . . . 58

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 58

Charging control . . . . . . . . . . . . . . . . . . . . 58

Transfer/separation control. . . . . . . . . . . . 59

Contents

ENWW iii

M14 (charger cleaning) control . . . . . . . . . 60

M10 (transfer/separation cleaning)

control . . . . . . . . . . . . . . . . . . . . . . . .61

PCL/TSL control . . . . . . . . . . . . . . . . . . . . 62

Developing unit . . . . . . . . . . . . . . . . . . . . . . . . . 63

Composition . . . . . . . . . . . . . . . . . . . . . . .63

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 63

M3 (developing) control. . . . . . . . . . . . . . . 63

Developing bias control. . . . . . . . . . . . . . . 64

Dmax (maximum contrast) control . . . . . . 65

Gradation correction control . . . . . . . . . . . 67

Dot diameter correction control . . . . . . . . .68

Toner density control. . . . . . . . . . . . . . . . . 69

FM4 (developing suction) control . . . . . . . 69

Toner supply unit. . . . . . . . . . . . . . . . . . . . . . . .70

Composition . . . . . . . . . . . . . . . . . . . . . . .70

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 70

Toner level detection control . . . . . . . . . . . 71

M12 (toner supply) control . . . . . . . . . . . .72

Cleaning/toner recycle unit . . . . . . . . . . . . . . . . 73

Composition . . . . . . . . . . . . . . . . . . . . . . .73

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 73

Toner guide roller (TGR) control . . . . . . . . 74

Other control . . . . . . . . . . . . . . . . . . . . . . .74

Tray 2/3 paper feed unit . . . . . . . . . . . . . . . . . .75

Composition . . . . . . . . . . . . . . . . . . . . . . .75

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 75

First paper feed control . . . . . . . . . . . . . . . 77

Paper up drive control. . . . . . . . . . . . . . . .79

Paper size detection control . . . . . . . . . . . 80

No paper detection control . . . . . . . . . . . . 81

Tray 4 paper feed unit . . . . . . . . . . . . . . . . . . . . 82

Composition . . . . . . . . . . . . . . . . . . . . . . .82

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 82

First paper feed control . . . . . . . . . . . . . . . 84

Paper up drive control. . . . . . . . . . . . . . . .86

Paper size detection control . . . . . . . . . . . 87

No paper detection control . . . . . . . . . . . . 87

Tray 1 (bypass tray) . . . . . . . . . . . . . . . . . . . . . 89

Composition . . . . . . . . . . . . . . . . . . . . . . .89

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 89

First paper feed control . . . . . . . . . . . . . . . 90

Paper up/down control . . . . . . . . . . . . . . .90

Paper size detection control . . . . . . . . . . . 91

No paper detection control . . . . . . . . . . . . 92

Vertical conveyance section . . . . . . . . . . . . . . . 93

Composition . . . . . . . . . . . . . . . . . . . . . . .93

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 93

Vertical conveyance control . . . . . . . . . . .93

Automatic duplex unit (ADU). . . . . . . . . . . . . . . 95

Composition . . . . . . . . . . . . . . . . . . . . . . .95

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . 96

Loop/second paper feed control . . . . . . .101

Paper conveyance control. . . . . . . . . . . .103

Paper reverse and exit control . . . . . . . . 104

ADF paper conveyance/feed control . . . 108

Fuser unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Composition . . . . . . . . . . . . . . . . . . . . . . 111

Mechanisms . . . . . . . . . . . . . . . . . . . . . . 111

M16 (web drive) control . . . . . . . . . . . . . 113

Fuser temperature control . . . . . . . . . . . 114

Other kinds of control . . . . . . . . . . . . . . . . . . . 116

Parts energized when SW1 (main

power) is off . . . . . . . . . . . . . . . . . . 116

Parts that operate when SW1 (main

power)/SW2 (secondary power)

is on . . . . . . . . . . . . . . . . . . . . . . . . 117

Cooling fan control . . . . . . . . . . . . . . . . . 118

Control panel control. . . . . . . . . . . . . . . . 122

Counter control . . . . . . . . . . . . . . . . . . . . 124

Option control . . . . . . . . . . . . . . . . . . . . . 126

5 MFP disassembly/assembly

External section . . . . . . . . . . . . . . . . . . . . . . . 132

Replacing the ozone filter . . . . . . . . . . . . 132

Replacing the developing suction filter . . 133 Removing and reinstalling the

external covers . . . . . . . . . . . . . . . . 133

Changing the control panel

attachment angle and

removing/reinstalling. . . . . . . . . . . . 136

Resetting the circuit breaker . . . . . . . . . . 137

Drive section. . . . . . . . . . . . . . . . . . . . . . . . . . 138

Removing and reinstalling the drum

motor (M2) . . . . . . . . . . . . . . . . . . . 138

Removing and reinstalling the fusing

input gear . . . . . . . . . . . . . . . . . . . . 140

Scanner section . . . . . . . . . . . . . . . . . . . . . . . 141

Screws that must not be removed . . . . . 141

Removing and reinstalling the CCD

unit . . . . . . . . . . . . . . . . . . . . . . . . . 141

Replacing the exposure lamp . . . . . . . . . 142

Removing and reinstalling the

exposure unit . . . . . . . . . . . . . . . . . 143

Installing the optics wire . . . . . . . . . . . . . 145

Cleaning the ADF glass and scanner

glass . . . . . . . . . . . . . . . . . . . . . . . . 147

Replacing the scanner motor (M11) . . . 148

Laser scanner unit . . . . . . . . . . . . . . . . . . . . . 150

Removing and reinstalling the laser/

scanner assembly. . . . . . . . . . . . . . 150

Cleaning the dust-proof glass. . . . . . . . . 151

Drum unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

Removing and reinstalling the drum

unit . . . . . . . . . . . . . . . . . . . . . . . . . 152

Installing the coupling . . . . . . . . . . . . . . . 154

iv ENWW

Removing, cleaning, and reinstalling

the drum . . . . . . . . . . . . . . . . . . . . .155

Removing and reinstalling the

separation claws and separation

claw solenoid . . . . . . . . . . . . . . . . .156

Removing and reinstalling the toner

control sensor board . . . . . . . . . . . .158

Corona unit . . . . . . . . . . . . . . . . . . . . . . . . . . .159

Screws that must not be removed. . . . . . 159

Removing and reinstalling the charging

corona unit . . . . . . . . . . . . . . . . . . .159

Removing and reinstalling the charge

control plate . . . . . . . . . . . . . . . . . . 160

Replacing the charging wires . . . . . . . . .160

Removing and reinstalling the

charging wire cleaning unit . . . . . . . 161

Removing and reinstalling the PCL. . . . . 162

Cleaning the charging corona unit/PCL . 163 Removing and reinstalling the

transfer/separation corona unit . . . . 163

Removing and reinstalling the plunger

prevention plate . . . . . . . . . . . . . . . 164

Replacing the transfer/separation

wires and transfer/separation

wire cleaning block . . . . . . . . . . . . .164

Removing and reinstalling the TSL unit .166

Developing unit . . . . . . . . . . . . . . . . . . . . . . . .166

Screws that must not be removed. . . . . . 166

Removing and reinstalling the

developing unit . . . . . . . . . . . . . . . . 166

Replacing the developer . . . . . . . . . . . . .167

Cleaning the developing unit bias shaft . 168

Toner supply unit. . . . . . . . . . . . . . . . . . . . . . . 169

Replacing and cleaning the toner

bottle . . . . . . . . . . . . . . . . . . . . . . . .169

Cleaning/toner recycle unit . . . . . . . . . . . . . . .170

Removing and reinstalling the

cleaning blade. . . . . . . . . . . . . . . . .170

Removing and reinstalling the toner

guide roller (TGR) . . . . . . . . . . . . . . 171

Paper feed units of Trays 2 and 3. . . . . . . . . .173

Removing and reinstalling the paper

feed unit . . . . . . . . . . . . . . . . . . . . . 173

Removing and reinstalling the paper

feed Trays 2 and 3 . . . . . . . . . . . . .173

Removing and reinstalling the paper

pick roller and pick roller rubber . . . 174 Removing and reinstalling the

separation roller rubber. . . . . . . . . .174

Replacing the pre-registration and feed

clutches (MCs) . . . . . . . . . . . . . . . . 175

Replacing the wires. . . . . . . . . . . . . . . . . 176

Wire lengths . . . . . . . . . . . . . . . . . . . . . .178

Installing wires. . . . . . . . . . . . . . . . . . . . . 178

Paper feed unit of Tray 3 . . . . . . . . . . . . . . . . 179

Removing and reinstalling the paper

feed unit . . . . . . . . . . . . . . . . . . . . . 179

Removing and reinstalling paper feed

Tray 3 . . . . . . . . . . . . . . . . . . . . . . . 179

Removing and reinstalling the paper

pick roller and pick roller rubber . . . 179

Removing and reinstalling the

separation roller rubber. . . . . . . . . . 180

Replacing the pre-registration and feed

clutches (MCs) . . . . . . . . . . . . . . . . 181

Replacing the wires . . . . . . . . . . . . . . . . 182

Wire lengths . . . . . . . . . . . . . . . . . . . . . . 183

Installing wires . . . . . . . . . . . . . . . . . . . . 184

Tray 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Removing and reinstalling Tray 1 . . . . . . 185

Replacing the paper pick roller/paper

pick roller rubber. . . . . . . . . . . . . . . 185

Replacing the separation roller rubber . . 186

Vertical conveyance section . . . . . . . . . . . . . . 187

Removing and reinstalling the vertical

conveyance section . . . . . . . . . . . . 187

Removing and reinstalling the vertical

conveyance MC (MC11, MC12) . . . 187

ADF unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Pulling out and reinstalling the ADU

stand. . . . . . . . . . . . . . . . . . . . . . . . 188

Cleaning the paper mis-centering PS

(PS70)/leading edge PS (PS43) . . . 189 Removing and reinstalling the

registration MC (MC1) . . . . . . . . . . 190

Removing and reinstalling the

second paper feed unit

(registration assembly) . . . . . . . . . . 191

Cleaning the registration PS (PS44) . . . . 192

Removing and reinstalling the

registration roller . . . . . . . . . . . . . . . 193

Removing and reinstalling the

pre-transfer roller . . . . . . . . . . . . . . 194

Cleaning the automatic document

feeder paper reverse PS (PS45)/

Reverse/Exit PS (PS46) . . . . . . . . . 195

Removing and reinstalling the ADF

reverse roller. . . . . . . . . . . . . . . . . . 198

Removing and reinstalling the ADU

stand. . . . . . . . . . . . . . . . . . . . . . . . 199

Removing and reinstalling the

pre-registration roller. . . . . . . . . . . . 201

Removing and reinstalling the ADU

conveyance roller 3 and 4. . . . . . . . 202

Removing and reinstalling the ADU

conveyance roller 1 and 2. . . . . . . . 205

Removing and reinstalling the paper

reverse/exit roller . . . . . . . . . . . . . . 207

Contents

ENWW v

Fuser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .208

Removing and reinstalling the fuser . . . . 208

Removing and reinstalling the fuser

(top). . . . . . . . . . . . . . . . . . . . . . . . . 208

Removing and reinstalling the web

cover . . . . . . . . . . . . . . . . . . . . . . . .209

Removing and reinstalling the

cleaning web . . . . . . . . . . . . . . . . . .210

Replacing the fusing heater lamps

(L2, L3) . . . . . . . . . . . . . . . . . . . . . .210

Replacing the fusing heater lamp (L4) . . 212 Removing and reinstalling the fusing

separation claw (upper) unit and

fusing separation claws (upper) . . . 213 Removing and reinstalling the fusing

separation claw (lower) unit and

fusing separation claws (lower). . . . 214

Removing and reinstalling the fusing

upper roller . . . . . . . . . . . . . . . . . . .214

Removing and reinstalling the fusing

lower roller . . . . . . . . . . . . . . . . . . . 215

Removing and reinstalling the

decurler roller . . . . . . . . . . . . . . . . . 216

Removing and reinstalling the fusing

temperature sensors 1 and 2 . . . . . 217

Removing and reinstalling the

thermostat/U (TS1) . . . . . . . . . . . . . 218

Removing and reinstalling the

thermostat/L (TS2) . . . . . . . . . . . . .220

6 Product comparison

hp LaserJet 9055mfp/9065mfp list of

differences. . . . . . . . . . . . . . . . . . . . . . . . 224

A Environmental Product Stewardship Program

Environmental Product Stewardship

Program . . . . . . . . . . . . . . . . . . . . . . . . . 226

Protecting the environment . . . . . . . . . . .226

B Terminology cross-reference

Terminology cross-reference for the MFP. . . . 228

Index

vi ENWW

1How to use this

manual

Manual contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Manual organization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

How to use this manual

ENWW 1

Manual contents

The HP LaserJet 9055mfp/9065mfp Service Manual contains six separate documents. Each document provides specific service information for one of the components that make up the HP LaserJet 9055mfp/9065mfp. The following are the component documents, listed in the order that they appear in the manual:

● HP LaserJet 9055mfp/9065mfp (main engine)

● Automatic document feeder

● 4000-sheet high capacity input

● Post insertion kit

● Punch kit

● Stapler/stacker and multifunction finisher

Manual organization

Each separate document contains its own table of contents and index. The tabs on the right-hand pages help you identify the sections of the manual. The tab for the table of contents in each document appears in magenta. The tabs for the remaining chapters in each document appear in gray.

2 How to use this manual ENWW

2Safety

Safety and important warning items. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Important notices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Description items for Warning, Caution, and Note. . . . . . . . . . . . . . . . . . 4

Safety warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Modifications not authorized by hp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Installation requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Measures to take in case of an accident . . . . . . . . . . . . . . . . . . . . . . . . 15

Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Regulatory statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Safety circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Overall protection circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Safety labels on the MFPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Scanner section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Laser/scanner assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Rear cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Safety

ENWW 3

Safety and important warning items

Read carefully the safety and important warning items described below to understand them before doing service work.

Important notices

Because of possible hazards to an inexperienced person servicing this MFP as well as the risk of damage to the MFP, HP strongly recommends that all servicing be performed only by HP-trained service technicians.

Changes may have been made to this MFP to improve its performance after this service handbook was printed. Accordingly, HP does not warrant, either explicitly or implicitly, that the information contained in this service handbook is complete and accurate.

The user of this service handbook must assume all risks of personal injury and/or damage to the MFP while servicing the MFP for which this service handbook is intended.

Therefore, this service handbook must be carefully read before doing service work both in the course of technical training and even after that, for performing maintenance and control of the MFP properly.

Keep this service handbook also for future service. When it is impossible to read the description about safety and warnings (due to contamination

or tear), the relevant page should be replaced.

Description items for Warning, Caution, and Note

In this service handbook, Warning, Caution, and Note are defined as follows together with a symbol mark to be used in a limited meaning.

When servicing the MFP, the relevant works (disassembling, reassembling, adjustment, repair, maintenance, and so forth) need to be conducted with utmost care.

WARNING! Warning messages alert the reader to a specific procedure or practice which,

if not followed correctly, could cause personal injury or catastrophic loss of data or equipment.

CAUTION Caution messages appear before procedures which, if not observed, could

result in loss of data or damage to equipment

Note Notes contain important information.

4Safety ENWW

Symbols used for safety and important warning items are defined as follows

Precaution when

using the MFP

Prohibition when

using the MFP

Direction when using the MFP

General precaution Electric hazard High temperature

General prohibition Do not touch with wet hand Do not disassemble

General instruction Unplug Ground/Earth

Safety warnings

Modifications not authorized by hp

HP MFPs are renowned for their high reliability. This reliability is achieved through high-quality design and a solid service network.

MFP design is a highly complicated and delicate process where numerous mechanical, physical, and electrical aspects have to be taken into consideration, with the aim of arriving at proper tolerances and safety factors. For this reason, unauthorized modifications involve a high risk of degradation in performance and safety. Such modifications are therefore strictly prohibited. The points listed below are not exhaustive, but they illustrate the reasoning behind this policy.

WARNING: Prohibited actions

Safety

● Do not use any cables or power cord not specified by

HP.

● Do not use any fuse or thermostat not specified by

HP.

● Safety will not be assured, leading to a risk of fire

and injury.

● Do not disable fuse functions or bridge fuse

terminals with wire, metal clips, solder, or similar object.

ENWW Safety warnings 5

WARNING: Prohibited actions

● Do not disable relay functions (such as wedging

paper between relay contacts).

● Do not disable safety functions (interlocks, safety

circuits, and so forth). Safety will not be assured, leading to a risk of fire and injury.

● Do not make any modification to the MFP unless

instructed by HP.

● Do not use parts not specified by HP.

Note Only qualified service personnel should disable relay functions and safety functions

when it is necessary to solve problems.

Checkpoints when performing on-site service

HP MFPs are extensively tested before shipping to ensure that all applicable safety standards are met, and to protect the customer and customer engineer (hereafter called the CE) from the risk of injury. However, in daily use, any electrical equipment may be subject to parts wear and eventual failure. In order to maintain safety and reliability, the CE must perform regular safety checks.

6Safety ENWW

Power supply

WARNING: Wall outlet

● Check that main voltage is as specified. Plug the

power cord into the dedicated wall outlet with a capacity greater than the maximum power consumption.

● If excessive current flows in the wall outlet, fire may

result.

● If two or more power cords are plugged into the wall

outlet, the total load must not exceed the rating of the wall outlet.

● If excessive current flows in the wall outlet, fire may

result.

WARNING: Power plug and cord

● Make sure the power cord is plugged in the wall

outlet securely. Contact problems may lead to increased resistance,

overheating, and the risk of fire.

● Check whether the power cord is damaged. Check

whether the sheath is damaged. If the power plug, cord, or sheath is damaged,

replace with a new power cord (with plugs on both ends) specified by HP. Using the damaged power cord may result in fire or electric shock.

● When using the power cord (inlet type) that came

with this MFP, be sure to observe the following precautions:

a Make sure the MFP-side power plug is securely

inserted in the socket on the rear panel of the MFP. Secure the cord with a fixture properly.

b If the power cord or sheath is damaged, replace

with a new power cord (with plugs on both ends) specified by HP. If the power cord (inlet type) is not connected to the MFP securely, a contact problem may lead to increased resistance, overheating, and risk of fire.

Safety

ENWW Safety warnings 7

WARNING: Power plug and cord

●

Check whether the power cord is not stepped on or pinched by a table and so on.

● Overheating may occur there, leading to a risk of

fire.

● Do not bundle or tie the power cord.

Overheating may occur there, leading to a risk of fire.

● Check whether dust has collected around the power

plug and wall outlet. Using the power plug and wall outlet without

removing dust may result in fire.

● Do not insert the power plug into the wall outlet with

a wet hand. The risk of electric shock exists.

● When unplugging the power cord, grasp the plug,

not the cable. The cable may be broken, leading to a risk of fire

and electric shock.

WARNING: Wiring

● Never use multi-plug adapters to plug multiple power

cords in the same outlet. If used, the risk of fire exists.

8Safety ENWW

WARNING: Wiring

● When an extension cord is required, use a specified

one. Current that can flow in the extension cord is limited,

so using an extension cord that is too long may result in fire.

Do not use an extension cable reel with the cable taken up. Fire may result.

WARNING: Ground lead

● Check whether the MFP is grounded properly.

If current leakage occurs in an ungrounded MFP, you may suffer electric shock while operating the MFP. Connect the ground lead to one of the following points:

a Ground terminal of wall outlet b Ground terminal for which Class D work has been

done

● Pay attention to the point where the ground lead is

connected. Connecting the ground lead to an improper point as

listed below results in a risk of explosion and electric shock:

a Gas pipe (A risk of explosion or fire exists.) b Lightning rod (A risk of electric shock or fire

exists.)

c Telephone line ground (A risk of electric shock or

fire exists in the case of lightning.)

d Water pipe or faucet (It may include a plastic

portion.)

Safety

ENWW Safety warnings 9

Installation requirements

WARNING: Prohibited installation place

● Do not place the MFP near flammable materials

such as curtains or volatile materials that may catch fire.

A risk of fire exists.

● Do not place the MFP in a place exposed to water

such as rain water. A risk of fire and electric shock exists.

WARNING: Non-operational handling

● When the MFP is not used over an extended period

of time (holidays, and so forth), turn it off and unplug the power cord.

Dust collected around the power plug and outlet may cause fire.

CAUTION: Temperature and humidity

● Do not place the MFP in a place exposed to direct

sunlight or near a heat source such as a heater. A risk of degradation in MFP performance or

deformation exists. Do not place the MFP in a place exposed to cool

wind. Recommended temperature and humidity are as follows:

Temperature: 10 Humidity: 10 percent to 80 percent (no dew

condensation)

° C to 30° C (50° F to 86° F)

CAUTION: Ventilation

● Do not place the MFP in a place where there is much

dust, cigarette smoke, or ammonia gas. Place the MFP in a well-ventilated location to prevent MFP problems and image issues.

10 Safety ENWW

CAUTION: Ventilation

● The MFP generates ozone gas during operation, but

it is not sufficient to be harmful to the human body. If a bad smell of ozone is present in the following

cases, ventilate the room.

● When the MFP is used in a poorly ventilated

room

● When making a lot of copies

● When using multiple MFPs at the same time

CAUTION: Vibration

● When installing the MFP, read the installation guide

thoroughly. Be sure to install the MFP on a level and sturdy surface.

Constant vibration will cause problems.

● Be sure to lock the caster stoppers.

In the case of an earthquake and so on, the MFP may slide, leading to a injury.

CAUTION: Inspection before servicing

● Before conducting an inspection, read all relevant

documentation (service handbook, technical notices, and so forth) and proceed with the inspection following the prescribed procedure in safety clothes, using only the prescribed tools. Do not make any adjustment not described in the documentation.

If the prescribed procedure or tool is not used, the MFP may break and a risk of injury or fire exists.

Safety

● Before conducting an inspection, be sure to

disconnect the power cords from the MFP and optional accessories.

When the power plug is inserted in the wall outlet, some units are still powered even if the power switch is turned off. A risk of electric shock exists.

ENWW Safety warnings 11

CAUTION: Inspection before servicing

●

The area around the fuser unit is hot. You may get burned.

WARNING: Work performed with the MFP powered

● Be careful when making adjustments or performing

an operation check with the MFP powered on. If you make adjustments or perform an operation

check with the external cover detached, you may touch live or high-voltage parts or you may be caught in moving gears or the timing belt, leading to a risk of injury.

● Be careful when servicing with the external cover

detached. High-voltage exists around the drum unit. A risk of

electric shock exists.

WARNING: Safety checkpoints

● Check the exterior and frame for edges, burrs, and

other damage. The user or CE may be injured.

● Do not allow any metal parts such as clips, staples,

and screws to fall into the MFP. They can short internal circuits and cause electric

shock or fire.

● Check wiring for squeezing and any other damage.

Current can leak, leading to a risk of electric shock or fire.

● When disconnecting connectors, grasp the

connector, not the cable. (Specifically, connectors of the AC line and high-voltage parts.)

Current can leak, leading to a risk of electric shock or fire.

12 Safety ENWW

WARNING: Safety checkpoints

● Carefully remove all toner remnants and dust from

electrical parts and electrode units such as a charging corona unit.

Current can leak, leading to a risk of MFP trouble or fire.

● Check high-voltage cables and sheaths for any

damage. Current can leak, leading to a risk of electric shock

or fire.

● Check electrode units such as a charging corona

unit for deterioration and sign of leakage. Current can leak, leading to a risk of trouble or fire.

● Before disassembling or adjusting the laser/scanner

assembly incorporating a laser, make sure that the power cord has been disconnected.

The laser light can enter your eye, leading to a risk of loss of eyesight.

● Do not remove the cover of the laser/scanner

assembly. Do not supply power with the laser/scanner assembly shifted from the specified mounting position.

The laser light can enter your eye, leading to a risk of loss of eyesight.

Safety

● When replacing a lithium battery, replace it with a

new lithium battery specified in the parts guide manual. Dispose of the used lithium battery using the method specified by local authority.

Improper replacement can cause explosion.

● After replacing a part to which AC voltage is applied

(for example, optical lamp and fuser lamp), be sure to check the installation state.

A risk of fire exists.

ENWW Safety warnings 13

WARNING: Safety checkpoints

●

Check the interlock switch and actuator for loosening and check whether the interlock functions properly.

If the interlock does not function, you may receive an electric shock or be injured when you insert your hand in the MFP (for example, when clearing a paper jam).

● Make sure the wiring cannot come into contact with

sharp edges, burrs, or other pointed parts. Current can leak, leading to a risk of electric shock

or fire.

● Make sure that all screws, components, wiring,

connectors, and so forth that were removed for safety check and maintenance have been reinstalled in the original location. (Pay special attention to forgotten connectors, pinched cables, forgotten screws, and so forth).

A risk of MFP trouble, electric shock, and fire exists.

WARNING: Handling of service materials

● Unplug the power cord from the wall outlet.

● Drum cleaner (isopropyl alcohol) and roller cleaner

(acetone-based) are highly flammable and must be handled with care. A risk of fire exists.

● Do not replace the cover or turn the MFP on before

any solvent remnants on the cleaned parts have fully evaporated.

A risk of fire exists.

● Use only a small amount of cleaner at a time and

take care not to spill any liquid. If this happens, immediately wipe it off.

A risk of fire exists.

14 Safety ENWW

WARNING: Handling of service materials

● When using any solvent, ventilate the room well.

Breathing large quantities of organic solvents can lead to discomfort.

● Toner and developer are not harmful substances,

but care must be taken not to breathe excessive amounts or let the substances come into contact with eyes, and so forth. It may be stimulative.

If the substances get in the eye, rinse with plenty of water immediately. When symptoms are noticeable, consult a physician.

● Never throw the used toner bottle and toner into fire.

You may be burned due to dust explosion.

Measures to take in case of an accident

If an accident has occurred, the distributor who has been notified first must immediately take emergency measures to provide relief to affected persons and to prevent further damage.

If a report of a serious accident has been received from a customer, an on-site evaluation must be carried out quickly and HP must be notified.

To determine the cause of the accident, conditions and materials must be recorded through direct on-site checks, in accordance with instructions issued by HP.

Conclusion

Safety of users and customer engineers depends highly on accurate maintenance and administration. Therefore, safety can be maintained by the appropriate daily service work conducted by the customer engineer.

When performing service, each MFP on the site must be tested for safety. The customer engineer must verify the safety of parts and ensure appropriate management of the equipment.

Safety

ENWW Safety warnings 15

Regulatory statements

FCC Class A Statement

This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference, in which case the user will be required to correct the interference at his own expense. The end user of this product should be aware that any changes or modifications made to this equipment without the approval of Hewlett-Packard could result in the product not meeting the Class A limits, in which case the FCC could void the user’s authority to operate the equipment.

Note Any changes or modifications to the MFP that are not expressly approved by HP

could void the user’s authority to operate this equipment.

Use of a shielded interface cable is required to comply with the Class A limits of Part 15 of the FCC Rules.

Safety information

Safety circuits

This MFP is provided with the following safety circuits to prevent MFP issues from resulting in serious accidents.

Overall protection circuit

L2 and L3 (fuser heater lamps) overheating prevention circuit These safety circuits are described below to provide the service engineer with a renewed

awareness of them in order to prevent servicing errors that may impair their functions.

16 Safety ENWW

Overall protection circuit

CBR1

CBR2

Protection by CBR1 and CBR2 (circuit breakers) CBR1 and CBR2 interrupt the AC line instantaneously when an excessive current flows due to a

short in the AC line.

CAUTION The CBR1 and CBR2 functions must not be deactivated under any

circumstances.

Protection by L2, L3 and L4 (fuser heater lamps) overheating prevention circuit

DCPS

RL1

PRCB

TS2

TS1

Safety

RL1

TH2

Control section

AC driver section

TH1

Protection by software

The output voltage from TH1 (fuser temperature sensor 1) is read by the CPU. If this voltage is abnormal, L2 (fuser heater lamp 1), L3 (fuser heater lamp 2), L4 (fuser heater lamp 3) and RL1 (main relay) are turned off.

CAUTION Do not change the gap between the roller and TH1. When replacing TH1, check

the specified mounting dimensions. The RL1 function must not be deactivated under any circumstances.

ENWW Safety information 17

Protection by the hardware circuit

The output voltages from TH1 and TH2 (fuser temperature sensors) are compared with the abnormality judgment reference value in the comparator circuit. If the output voltage from TH1 or TH2 exceeds the reference value, L2 (fuser heater lamp 1), L3 (fuser heater lamp 2), L4 (fuser heater lamp 3) and RL1 (main relay) are turned off.

CAUTION Periodically check the TH2 face contacting the roller, and replace TH2 if any

abnormality is detected.

Since TH1 (fuser temperature sensor) face does not contact the roller, check the distance from the roller and the sensor orientation if any abnormality is detected.

The RL1 function must not be deactivated under any circumstances.

Protection by TS1 (thermostat/U) and TS2 (thermostat/L)

When the temperature of the fuser roller (upper/lower) exceeds the specified value, TSs are turned off, thus interrupting the power to L2 (fuser heater lamp/1), L3 (fuser heater lamp/2), and L4 (fuser heater lamp/3) directly.

CAUTION Do not use any other electrical conductor in place of TS1 and TS2. Do not

change the distance between the roller and TS (thermostat).

18 Safety ENWW

Safety labels on the MFPs

Caution labels shown below are attached in some areas on/in the MFP. When accessing these areas for maintenance, repair, or adjustment, special care should be taken to avoid burns and electric shock.

CAUTION

DO NOT INSERT your finger into the two RADF hinge portions; otherwise you may be injured.

WARNING

This area generates high voltage. If touched, electrical shock may occur. DO NOT TOUCH.

Safety

CAUTION ATTENTION VORSICHT PRECAUCION ATTENZIONE

CAUTION

DO NOT put your hand between the main body and developing fixing unit; otherwise you may be injured.

CAUTION

High temperature!

Do not touch. Use care when clearing paper.

ATTENTION

Temp rature lev e!

Risque de br lure. Soyez prudent en retirant la feuille coinc e.

VORSICHT

Hei§e OberflŠche!

Brandverletzungsgefahr. Bei Beseitigung von Papierstaus vorsichtig vorgehen.

PRECAUCION

ÁTemperatura alta!

No tocar. Tener cuidado al remover el papel.

ATTENZIONE

Alta temperatura!

Non toccare. Agire con prudenza nel rimuovere la carta.

CAUTION

The fixing unit is very hot. To avoide getting burned, DO NOT TOUCH.

CAUTION ATTENTION VORSICHT PRECAUCION ATTENZIONE

CAUTION

The conveyance fixing unit is heavy. Use care and draw it out gently; otherwise you may be injured.

ENWW Safety labels on the MFPs 19

(Finisher with Cover Sheet Feeder only)

(Punch Kit)

(Q3634A Finisher only)

(Q3634A Finisher)

CAUTION You may be burned or injured if you touch any area that you are advised by

any caution label to avoid.

CAUTION Do not remove caution labels. If any caution label has come off or is soiled and

therefore the caution cannot be read, contact our service office.

20 Safety ENWW

Scanner section

Laser/scanner assembly

Rear cover

Safety

CAUTION You may be burned or injured if you touch any area that you are advised by

any caution label to avoid.

CAUTION Do not remove caution labels. If any caution label has come off or is soiled and

therefore the caution cannot be read, contact our service office.

ENWW Safety labels on the MFPs 21

WARNING

CAUTION You may be burned or injured if you touch any area that you are advised by

any caution label to avoid.

CAUTION Do not remove caution labels. If any caution label has come off or is soiled and

therefore the caution cannot be read, contact our service office.

22 Safety ENWW

3MFP overview

Overview of system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

hp LaserJet 9055mfp/9065mfp product specifications . . . . . . . . . . . . . . . . . . 25

Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Applicable copy paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Particulars of machine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Maintenance and life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Environmental conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Central cross-sectional view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Drive system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Fuser/web drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Drum drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Developing drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Paper feed/vertical conveyance/tray up drive sections . . . . . . . . . . . . . 30

Tray 1 paper feed/automatic duplex unit (ADU) pre-registration

drive section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Charging and transfer/separation wire cleaning drive section . . . . . . . . 32

Automatic Duplex Unit (ADU) conveyance drive section . . . . . . . . . . . . 33

Paper exit drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Toner supply drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Optics drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

MFP overview

ENWW 23

Overview of system

24 MFP overview ENWW

hp LaserJet 9055mfp/9065mfp product specifications

Type

Installation type

Console type (floor-mounted)

Copying method

Indirect electrostatic method

Document tray type

Fixed

Photosensitive material

OPC

Sensitizing method

Laser writing

Paper feed trays

Three stacked trays (two for 500 sheets of

80 g/m 1500 sheets of 80 g/m

Tray 1 tray for various paper sizes (100 sheets of 80 g/m

or 20 lb paper, one for

or 20 lb paper)

Q3637A (4000 sheets of 80 g/m2 or 20 lb paper) (optional) Q3638A (4000 sheets of 80 g/m2 or 20 lb paper) (optional)

Functions

Applicable document types

Sheets, books, and solid objects

Document size

A3/11 by 17 maximum

Copy paper size

● Metric area

A3 to A6R, F4

● Inch area

11 by 17 to 8.5 by 5.5 Wide paper (up to 314 mm by 459 mm maximum)

Magnifications

Fixed magnifications

• Metric area x1.00, x2.00, x1.41, x1.22, x1.15, x0.86,

0.82, x0.71, x0.50

• Inch area x1.00, x2.00, x1.55, x1.29, x1.21, x0.93,

0.77, x0.65, x0.50

Special ratio magnifications

3 modes

Zoom magnifications

x0.25 to x4.00 (in 1 percent steps)

Vertical magnifications

x0.25 to x4.00 (in 1 percent steps)

Horizontal magnifications

x0.25 to x4.00 (in 1 percent steps)

Warm-up time

5.5 minutes maximum 20° C, rated voltage 9055 6 minutes maximum 20° C, rated voltage 9065

First copy out time (FCOT)

Mode A4/8.5 by 11 Manual 3.4 seconds or shorter (9055)

3.1 seconds or shorter (9065)

Straight paper ejection, platen mode, life

* size, non AE or AES, without finisher, and paper feed fro

Continuous copy speed (life size, copies/min)

Size cpm A4/8.5 by 11 55 (9055)

Continuous copy count

1 to 9999

Copy density selection

AE or AES, manual (9 steps) Arbitrary density (2 modes)

m Tray 2

65 (9065)

MFP overview

ENWW hp LaserJet 9055mfp/9065mfp product specifications 25

E-RDH memory capacity

Standard 64 MB Maximum 192 MB

Applicable copy paper

Plain paper

High-quality paper of 60 g/m 17 lb to 90 g/m

, or 24 lb

Special paper (Tray 1 feed only)

OHT film Blueprint master paper

(both Tray 1 tray and stacked trays) Ta bs Plain paper of 50 g/m

59 g/m Plain paper of 91 g/m

200 g/m

, or 16 lb

, or 45 lb

, or

, or 13 lb to

, or 24 lb to

Power consumption

230 V Machine: 2300 W maximum (full option)

120 V Machine: 1920 W maximum (full option)

Weight: Approximately 203 kg (447 lb)

External dimensions

1140

650

766

Options

HCI: Q3637A (Letter/A4), Q3638A (Ledger/A3)

Paper exit Tray 100 sheet: Q3640A Hard disk: Q3642A Finisher: Q3633A, Q3634A Cover sheet feeder: Post inserter Q3636A Puncher: Punch Kit

• 2-hole Q3635A

• 3-hole Q3689A

• 4-hole Swedish Q3691A

• 4-hole Q3690A

Print Controller: Q3639A

Particulars of machine

Power supply

230 VAC -14 percent to 10.6 percent 50Hz/60Hz

120 VAC ±10 percent 60 Hz

(mm)

Maintenance and life

Periodic maintenance: Every 250,000

copies

Machine life: 5,000,000 copies or 5 years

Environmental conditions

Temperature: 10° C to 30° C (50° F to 86° F)

Humidity: 10 percent to 80 percent RH

Note The information herein may be

subject to change for improvement without notice.

26 MFP overview ENWW

Central cross-sectional view

ENWW Central cross-sectional view 27

MFP overview

Drive system diagram

Fuser/web drive section

Cleaning web unwinding shaft

Cleaning web wind-up shaft

Reverse/exit switching gate

Web SD (SD2)

Ratchet

FRONT

Fixing input gear

Fixing upper roller

Fixing lower roller

Decurler roller

Reverse gate SD (SD7)

Fixing motor (M4)

28 MFP overview ENWW

Drum drive section

Separation claw swing cam

Separation claw SD (SD1)

Drum

Separation claw section

Toner conveyance screw

Developing drive section

Drum motor (M2)

Toner guide roller

Drum motor (M2)

Toner conveyance screw

MFP overview

Developing sleeve

Developing motor (M3)

Agitator wheel

ENWW Drive system diagram 29

Agitator screws

Paper feed/vertical conveyance/tray up drive sections

30 MFP overview ENWW

Tray 1 paper feed/automatic duplex unit (ADU) pre-registration drive section

ENWW Drive system diagram 31

MFP overview

Charging and transfer/separation wire cleaning drive section

[Charging corona unit]

Charging cleaning motor (M14)

[Transfer and separation corona unit]

FRONT

Transfer/separation cleaning motor (M10)

32 MFP overview ENWW

Automatic Duplex Unit (ADU) conveyance drive section

ENWW Drive system diagram 33

MFP overview

Paper exit drive section

Paper exit motor (M7)

Paper exit roller

Toner supply drive section

Exit conveyance roller

34 MFP overview ENWW

Optics drive section

Scanner motor (M11)

Scanner drive wire (rear)

Exposure unit

FRONT

Scanner drive wire (front)

V-mirror unit

ENWW Drive system diagram 35

MFP overview

36 MFP overview ENWW

4MFP unit explanation

External section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

M2 (drum) control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

M4 (fuser) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Scanner section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

M11 (scanner) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Exposure control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Original read control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

APS control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

AE control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Laser scanner unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

M15 (polygon) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Image write control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Drum unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Separation claw control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Paper guide plate control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Corona unit section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Charging control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Transfer/separation control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

M14 (charger cleaning) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

M10 (transfer/separation cleaning) control. . . . . . . . . . . . . . . . . . . . . . . 61

PCL/TSL control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

ENWW 37

MFP unit explanation

Developing unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

M3 (developing) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Developing bias control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Dmax (maximum contrast) control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Gradation correction control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Dot diameter correction control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Toner density control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

FM4 (developing suction) control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Toner supply unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Toner level detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

M12 (toner supply) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Cleaning/toner recycle unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Toner guide roller (TGR) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Other control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Tray 2/3 paper feed unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

First paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Paper up drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Paper size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

No paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Tray 4 paper feed unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

First paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Paper up drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Paper size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

No paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Tray 1 (bypass tray) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

First paper feed control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Paper up/down control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Paper size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

No paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92

Vertical conveyance section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Vertical conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Automatic duplex unit (ADU) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Loop/second paper feed control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Paper conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Paper reverse and exit control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

ADF paper conveyance/feed control . . . . . . . . . . . . . . . . . . . . . . . . . . 108

38 ENWW

Fuser unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Mechanisms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

M16 (web drive) control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Fuser temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Other kinds of control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Parts energized when SW1 (main power) is off. . . . . . . . . . . . . . . . . . 116

Parts that operate when SW1 (main power)/SW2 (secondary

power) is on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Cooling fan control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Control panel control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Counter control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Option control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

ENWW 39

MFP unit explanation

External section

Composition

40 MFP unit explanation ENWW

Drive section

Composition

Scanner motor (M11)

Toner bottle motor (M13)

Developing motor (M3)

Loop roller motor (M6)

Paper feed motor (M1)

Drum motor (M2)

Fixing motor (M4)

Mechanisms

Mechanism Driven parts Method Drum

drive*1

Developing drive*1

Fuser drive*1

Paper feed drive*1

Tray 1/loop drive*1

Scanner drive*1

Paper exit drive*1

Drum, Toner guide roller, Toner conveyance screw, and Separation claw swing

Developing sleeve Gear drive

Fuser roller (upper) Gear drive

Tray 2/3/4, Vertical conveyance roller (middle/lower)

Tray 1 feed roller and ADU pre-registration roller

Exposure unit, V-mirror unit

Paper exit roller Gear drive

Gear drive (dedicated motor)

(dedicated motor)

(dedicated motor) Gear drive

(dedicated motor) + Belt

Gear drive (dedicated motor) + Belt

Wire drive (dedicated motor)+ Belt

(dedicated motor)

*1 Independent drive mechanisms

Drive mechanisms of this machine are driven by dedicated motors to ensure high-speed operation and to improve serviceability of the drum unit and developing performance.

Speeds of the drum motor (M2), fuser motor (M4), and loop roller motor (M6) are switched as shown below according to the paper type selected in the key operator mode, thus enhancing reliability of copying on thick paper.

Paper type Motor speed Thick paper 185 mm/s Others 280 mm/s (9055)

320 mm/s (9065)

ENWW Drive section 41

MFP unit explanation

M2 (drum) control

P.GND

DRUM CONT

DRUM CLK

CW/CCW

DRUM EM

PRCB

MS1 MS2

24V2

P.GND

DCPS

M2 (drum) is controlled by PRCB (printer control board) and the motor drive power is supplied from DCPS (DC power supply unit).

1 Operation

M2 (drum) is a motor driven by 24 VDC. It drives the drum, toner guide roller, toner conveyance screw, and separation claw swing. The flywheel mechanism adopted for M2 ensures accurate and steady rotation.

M2 starts rotating when the START button is pressed and stops when the specified time lapses after completion of second paper feeding of the last copy.

When either one of the front-left and front-right doors of this machine opens, MS1 (interlock MS/R) or MS2 (interlock MS/L) actuates to stop supplying the DC power to the motor, causing M2 to stop.

2 Signals

a Input signal

1 DRUM_EM (M2 to PRCB)

M2 (drum) rotation abnormality detection signal [H]: Rotation error (when motor speed changes by 6.5 percent more or less than the motor speed specified value) [L]: Normal rotation

b Output signals

1 DRUM_CONT (PRCB to M2)

M2 (drum) ON/OFF control signal [L]: M2 on [H]: M2 off

2 CW/CCW (PRCB to M4)

M2 (drum) rotational direction switchover signal [L]: CW rotation [H]: CCW rotation

3 DRUM_CLK (PRCB to M2)

M2 (drum) rotational speed control clock signal

M4 (fuser) control

P.GND

MAINM CONT

MAINM CLK

MAINM F/R MAINM EM

PRCB

MS1 MS2

24V2

P.GND

DCPS

M4 (fuser) is controlled by PRCB (printer control board) and the motor drive power is supplied from DCPS (DC power supply unit).

1 Operation

M4 (fuser) is a motor driven by 24 VDC. It drives the fuser roller.

M4 starts rotating when the START button is pressed and stops when the last copied paper has been ejected.

During the warm-up operation, M4 rotates to rotate the fuser roller.

42 MFP unit explanation ENWW

2 Signals

a Input signal

1 MAINM_EM (M4 to PRCB)

M4 (fuser) rotation error detection signal [H]: Rotation error (when motor speed changes by 6.5 percent more or less than the motor speed specified value) [L]: Normal rotation

b Output signals

1 MAINM_CONT (PRCB to M4)

M4 (fuser) ON/OFF control signal [L]: M4 on [H]: M4 off

2 MAINM_F/R (PRCB to M4)

M4 (fuser) rotational direction switchover signal [L]: CW rotation [H]: CCW rotation

3 MAINM_EM (M4 to PRCB)

M4 (fuser) rotational speed control clock signal

ENWW Drive section 43

MFP unit explanation

Scanner section

Composition

Mechanisms

Mechanism Method Light source Xenon lamp Exposure Light source moving slit exposure, static

Scanning Platen original scanning: 1st, 2nd, and

Lamp power supply

Scanner cooling

44 MFP unit explanation ENWW

exposure

3rd mirrors are shifted. ADF original scanning: Original is moved

with light source held stationary. Lamp cord

Cooling fan

M11 (scanner) control

SCAN CLK

SCAN FR

SCAN MGN SCAN CUR1 SCAN CUR2 SCAN CUR3

MODE1 MODE2 MODE3

SCANHP PS

PRCB

5V2

S.GND

24V1

5V2 S.GND P.GND

S.GND

SIG

c Exposure unit home position search

When SW2 (sub power switch) or the

U V

M11

START button is pressed, M11 (scanner) searches for the home position of the exposure unit. However,

PS61

this operation is performed in different ways depending on whether PS61 (scanner HP) is on or off.

1 When PS61 (scanner HP) is off

PS61

Platen APS read position

DCPS

SCDB

M11 (scanner) is driven by SCDB (scanner drive board) and is controlled by PRCB (printer control board).

The related signal is PS61 (scanner HP).

1 Operation

a Operation of M11 (scanner)

M11 (scanner) is a 3-phase stepping motor driven by the 3-phase bipolar constant-current drive method. The motor is turned on/off by supplying/stopping clock pulses.

The rotational speed, direction, and amount of movement of M11 is determined by the increment of the driving step count. This count is reset each time PS61 (scanner HP) is turned on or off by the exposure unit.

b Movement speed of the exposure unit

Scanning speed

Operation mode Movement speed Scan 320 mm/s (1:1) Return 640 mm/s Home position search 247 mm/s

2 When PS61 (scanner HP) is on

PS61

Platen APS read position

d Read with shading correction

Shading correction is performed in different ways depending on whether SW2 (sub power) is on or the START button is on. When shading correction starts, the exposure unit is at the home position and PS61 (scanner HP) is off.

1 When SW2 (sub power) is on

L1 (exposure lamp) turns on. Next, M11 (scanner) moves the exposure unit toward the paper exit side. After being driven by the specified number of steps, M11 stops, thus reading the light reflected by the white reference plate installed underneath the glass stopper plate and performing the first

MFP unit explanation

ENWW Scanner section 45

white correction. Next, M11 moves the exposure unit toward the paper exit side. After being driven by the specified number of steps, M11 performs the second white correction.

Then, L1 is turned off for black correction, searching for the home position of the exposure unit.

In each of the first and second shading correction processes, the CCD 1 line data is read to compare brightness levels between pixels. The brighter data is used as white correction data.

PS61

Platen APS read position

First white correction Second

white correction

Black correction

e ADF copy operation

After completion of the shading correction started by pressing the START button, M11 (scanner) moves the exposure unit toward the paper exit side. After being driven by the specified number of steps from the position where PS61 (scanner HP) was turned on, it stops. This position is the exposure position for ADF copy operation.

Then, ADF copy operation is performed. After completion of the ADF copy operation, L1 (exposure lamp) is turned off to start searching for the exposure unit home position.

PS61

Platen APS read position

First white correction Second

white correction

Home position search

2 When the START button is on

L1 (exposure lamp) turns on. Next, M11 (scanner) moves the exposure unit toward the paper exit side. After being driven by the specified number of steps, M11 (scanner) stops, thus reading the light reflected by the white reference plate installed underneath the glass stopper plate and performing the first white correction. Next, M11 moves the exposure unit toward the paper exit side. After being driven by the specified number of steps, M11 performs the second white correction.

f Platen (scanner glass) copy operation

Home position search

Original read position

Platen copy operation is performed in different ways depending on whether AE control is performed.

After completion of the shading correction started by pressing the START button, AE scanning is performed in the paper feed direction if the AE mode has been selected.

Then, exposure scanning is performed at the speed corresponding to the specified magnification by the distance corresponding to the original size, thus searching for the home position.

Then, M11 proceeds to the ADF copy operation or platen copy operation.

46 MFP unit explanation ENWW

1 Operation with AE

PS61

Home position search

Platen APS read position

First white correction Second

white correction

AE scanning

Exposure scanning

2 Operation without AE

PS61

Platen APS read position

First white correction

Exposure scanning

Second white correction

b PRCB output signal

1 SCAN_CLK (PRCB to SCDB)

M11 (scanner) clock signal

2 SCAN_F/R (PRCB to SCDB)

M11 (scanner) rotational direction switchover signal

[L]: The exposure unit is moved toward the paper exit side.

[H]: The exposure unit is moved toward the paper feed side.

3 MODE1 to 3 (PRCB to SCDB)

M11 (scanner) energize switchover signals

4 SCAN_CUR1 to 3 (PRCB to SCDB)

M11 (scanner) energize current switchover signals

c SCDB output signals

1 U, V, W (SCDB to M11)

M11 (scanner) drive control signals These signals are used to control

rotation of M11 (scanner). By supplying and stopping clock pulses, the motor is turned on/off and the rotational direction is switched.

Home position search

2 Signals

a Input signals

1 SIG/SCANHP_PS (PS61 to SCDB to

PRCB) Scanner home position detection

signal The reference position of the home

position of the exposure unit is detected.

[L]: The exposure unit is detected. [H]: The exposure unit is not

detected.

ENWW Scanner section 47

MFP unit explanation

Exposure control

Original read control

PRCB

DCPS

EXP CONT

5V2

S.GND

24V1

5V2 S.GND P.GND

L.PG

SCDB

CONT

LAMP.PG

24V

L1 INVB

L1 (exposure lamp) is driven by L1 INVB (L1 inverter) and is controlled by PRCB (printer control board) via SCDB (scanner drive board).

1 Operation

L1 (exposure lamp) is a xenon lamp driven by the inverter circuit. The xenon lamp can emit a constant light intensity and generates less heat than other lamps, so it does not require the light intensity control circuit that has been used in the existing machines, requiring no thermal protector circuit. However, since L1 is held lit when the exposure unit is stationary in the ADF mode, FM9 (scanner cooling) is installed in the read section.

2 Signals

a Output signals

1 EXP_CONT (PRCB to SCDB)

L1 (exposure lamp) ON/OFF control signal

[L]: L1 on [H]: L1 off

2 CONT (SCDB to L1 INVB)

L1 (exposure lamp) ON/OFF control signal

[L]: L1 on [H]: L1 off

12V2 12V2

GND

APR

ADRST

PDWN

GND

TCK

/TCK

GND

RCK

/RCK

GND

LCLK1

/LCLK1

GND

SCLK

ICB

/SEN

SDI

SDO

CLAMP

GND

BCLAMP

GND

/D0

GND

/D1

GND

/D2

GND

LCLK0

/LCLK0

GND

5V2 5V2

GND

CCD

ADB

Original read control is performed by ADB (A/D converter board) and CCD sensor installed in ADB.

1 Operation

The light reflected by the exposed original is input to the CCD sensor through the lens. The analog voltage corresponding to the quantity of the input light is A/D-converted in the ADB (A/D converter board), being output to the ICB (image control board).

48 MFP unit explanation ENWW

a Original read

The original read timing is as follows: 1 Platen mode

After lapse of the specified interval since the exposure unit turned PS61 (scanner HP) off.

2 ADF mode

After lapse of the specified interval since the original's leading edge turned PS306 (original conveyance) on.

APS control

SCDB

S.GND

APS TIM

S.GND

APS.1

APS 5V

S.GND

APS.2

APS 5V

S.GND

APS.3

APS 5V

S.GND

SIZE PS L

S.GND

SIZE PS S

A.GND

SIZE ANA

3.3V

PS51

PS63

PS64

PS65

PS309

PS310

VR301

APC CONT

COVER SIG

APS.1 SIG APS.2 SIG APS.3 SIG

ICB

APS TIMING

SIZE PS L SIZE PS S

SIZE ANA

PRCB

24V1

5V2 S.GND P.GND

DCPS

The APS method used in the platen mode is different from that used in the ADF mode. The signal read by the APS sensor or ADF's original size detection sensor is processed by ICB (image control board) via SCDB (scanner drive board).

1 Operation

a APS detection

1 ADF mode

The paper size is detected according to the combination of on/off states of PS309 (original size/2) and PS310 (original size/1) of the ADF's original feed tray and the resistance value of VR301 (original paper size).

2 Platen mode

The paper size is detected according to the combination of on/off states of PS63 (APS/1), PS64 (APS/2), and

PS65 (APS/3) and the signal read by the CCD sensor. PS63 to PS65 are used to detect the original size in the sub-scanning direction and the CCD sensor is used to detect the original size in the main scanning direction.

Paper exit side

PS65

PS63

PS64

Photo sensor LED

Relationships between sensors and paper sizes are as follows:

Sensor Paper size Min. size {{{ B5R z{{ B5 {{{ B4 zzz A4R zz{ A4 {{{ A3 zzz

8.5 by 11R z{{

8.5 by 11 {{{

8.5 by 14 zzz 11x 17 zzz

PS65 PS63 PS64

z ON { OFF

b APS detection timing

The APS detection timing differs between the platen mode and DF mode.

1 ADF mode

When the ADF mode is selected or an original is set on the ADF original feed tray, APS detection takes place using

MFP unit explanation

ENWW Scanner section 49

PS309 (original size/2), PS310 (original size/1), and VR301 (original size).

2 Platen mode

When the ADF is closed and PS51 (APS timing) turns on, L1 (exposure lamp) turns on and the CCD detects the reflected light to detect the original size in the main scanning direction. Since ADF is still open at this time, the black level of the sky shot (outside the original) and the white level of the original (inside the original) are detected according to whether an original is present. At this time, the original size in the sub-scanning direction is detected using PS63 to PS65 (APS/1 to APS/3). When the ADF is closed completely and PS311 (ADF open/close) turns on, CCD reads the white level of the platen cover and the black level in the original. Among the two original sizes detected as discussed above, the larger size is determined as the original size in the main scanning direction.

2 Signals

a Input signals

1 APS_TIM (PS51 to SCDB)

ADF open/close detection signal [L]: ADF is closed. [H]: ADF is open.

2 APS.1/APS.1_SIG (PS63 to SCDB to

ICB) Paper size detection signal

[L]: Paper is detected. [H]: Paper is not detected.

3 APS.2/APS.2_SIG (PS64 to SCDB to

ICB) Paper size detection signal

[L]: Paper is detected. [H]: Paper is not detected.

4 APS3/APS.3_SIG (PS65 to SCDB to

ICB) Paper size detection signal

[L]: Paper is detected. [H]: Paper is not detected.

5 SIZE_PS_L (PS309 to SCDB to ICB)

Paper size detection signal [L]: Paper is detected. [H]: Paper is not detected.

6 SIZE_PS_S (PS310 to SCDB to ICB)

Paper size detection signal [L]: Paper is detected. [H]: Paper is not detected.

7 SIZE_ANA (PS301 to SCDB to ICB)

Paper size detection signal [L]: Paper is detected. [H]: Paper is not detected.

8 COVER_SIG (SCDB to ICB)

Same as APS TIM signal.

9 APS_TIMING (SCDB to PRCB)

Same as APS TIM signal.

b Output signals

1 APS_CONT

This signal controls on/off states of APS_5V power for driving PS63, PS64, and PS65 (APS1 to APS3).

[L]: APS_5V off [H]: APS_5V on

50 MFP unit explanation ENWW

AE control

ICB

12V2 12V2

GND

APR

ADRST

PDWN

GND

TCK

/TCK

GND

RCK

/RCK

GND

LCLK1

/LCLK1

GND

SCLK

/SEN

SDI

SDO

CLAMP

GND

BCLAMP

GND

/D0

GND

/D1

GND

/D2

GND

LCLK0

/LCLK0

GND

5V2 5V2

GND

CCD

ADB

1) Normal copy 10 mm inside the perimeter of the

original detected by APS.

2) Non-image area erasure mode Entire original area detected during

pre-scanning.

2 ADF mode

The image at the leading edge of the original is read when the PRINT button is pressed.

The read data is used to measure the image density on the original.

1) Main scanning direction 10-mm area inside the original

detected by APS

2) Sub-scanning direction 2-to-4 mm area from the leading edge

of the original.

The CCD sensor detects the image density on an original during AE scanning to select the optimum copy gamma correction curve.

AE processing is controlled by the ICB (image control board).

1 Operation

a AE detection

1 Platen mode

The image density on an original is measured during AE scanning preceding the exposure scanning that is carried out after depression of the START button.

ENWW Scanner section 51

MFP unit explanation

Laser scanner unit

Composition

Laser driver board (LDB)

Collimator lens unit

Index sensor board (INDXSB)

Cylindrical lens 2

Cylindrical lens 1

Polygon mirror

Mechanisms

Mechanism Method Scan*1 Polygon mirror Light source*2 1-chip, 2-beam laser diode

(Power: 15 mW per beam)

Reference positioning Index sensor

*1 Path of laser light

The light output from the semiconductor laser is radiated onto the OPC drum via the collimator lens, cylindrical lens 1, polygon mirror, fθ lens, cylindrical lens 2, and write mirror.

f lens

Write mirror

Index mirror

Semiconductor laser

Write mirror

Collimator lens

Cylindrical lens 1

Polygon mirror

f lens

Cylindrical lens 2

52 MFP unit explanation ENWW

*2 Light source

Conventionally, two parallel beams were generated from two laser beams. The laser diode adopted for this machine can generate two beams using a single chip, requiring neither fine-adjustment prism nor beam composition prism.

M15 (polygon) control

24V1

P.GND

POLM CONT

POLM CLK

POLM LOCK

PRCB

DCPS

24V/1

5V/2

S.GND P.GND

PMDB

M15 (polygon) is driven by PMDB (polygon drive board) and is controlled by PRCB (printer control board).

1 Operation

a Explanation of operation

M15 is a 3-phase brushless DC motor which is driven by the 3-phase bipolar method. The current flowing through the coil is switched according to the position of the rotor detected by the position sensor (magnetic sensor) in the motor.

This motor rotates the polygon mirror to scan the laser beams from LDB (laser driver board) in the axial direction of the drum. Its rotation is held constant by PLL control.

b Rotational speed

M15 is powered by 24 VDC and its rotational speed is as follows:

Rotational speed

37,795 rpm 320 mm/s - normal 33,070 rpm 280 mm/s normal 21,850 rpm 185 mm/s thick paper

Linear speed 9055 9065

M15

2 Signals

a Input signals

1 POLM_LOCK (PMDB to PRCB)

This signal indicates the clock synchronization state of M15 (polygon).

[L]: Synchronous (normal) [H]: Asynchronous (abnormal)

b Output signals

1 POLM_CONT (PRCB to PMDB)

This signal turns on/off M15. [L]: M15 on [H]: M15 off

2 POLM_CLK (PRCB to PMDB)

This is a reference clock signal for PLL-controlling M15 in PMDB.

Image write control

SGND

/IND

SGND

/INDPR

VIDEO2

/VIDEO2

LPR5V

LD5V LD5V

VIDEO1

/VIDEO1

/ENB1

/S/H1

/ALM1

/ENB2

/S/H2

/ALM2

DADI

DACLK

DALD

24V1

5V2

S.GND

DCPS

P.GND

ICB

The analog image data from the CCD sensor is A/D-converted by the ADB (A/D converter board), then sent to the ICB (image control board) for data processing. The processed image data is converted into a laser beam on the LDB (laser driver board), and then the

GND

INDXSB

LDB

CCD

ADB

MFP unit explanation

ENWW Laser scanner unit 53

beams are radiated onto the drum surface. Two beams are emitted per laser diode. Two lines of image data is written per scan.

The write start reference position is detected by the index sensor board. The ICB has an E-RDH function to store digitized image data. Various editing functions can be performed based on this data.

1 Operation

a Image processing

The following processing is performed by the ICB (image control board):

1 Automatic offset control (AOCl)

The IC on the A/D converter board (ADB) automatically adjusts the analog offset voltage of the CCD sensor output so that it is at the lower limit of the A/D converter level.

2 Automatic gain control (AGC)

During shading correction, the white reference plate is read to adjust the analog amplification factor of the CCD sensor output so that the read level is at the upper limit of the A/D converter level.

3 Shading correction

• When SW2 (sub power) is on

•At job start

4 Brightness/density conversion 5 AE processing 6 Text/dot pattern judgment 7 Filtering 8 Magnification change processing 9 Copy gamma correction 10 Skew correction 11 Error diffusion processing 12 Data compression/expansion

processing

13 Write density control

b Write

The image control board (ICB) sends image data on a pixel basis to laser driver board (LDB) according to the control signals from the PRCB (printer control board).

LDB causes the laser light to be emitted for a period corresponding to the image data. This laser light is radiated onto the drum surface.

1 Maximum power control (MPC)

Image control board (ICB) informs LDB (laser driver board) of the maximum output value and sets that value for the laser beam emission. LDB store this value and maintain the laser beam level using the APC (Auto Power Control).

<MPC timing> When SW2 (sub power switch) is

turned on

2 Automatic power control (APC)

After MPC is set, the ICB (image control board) outputs an APC start instruction to LDB (laser driver board) at the following timing:

APC timing LDB (laser driver board) automatically

monitor the laser drive current one line at a time, and controls it so that the light intensity remains the MPC value.

3 Write timing

a) Main scanning direction Using INDEX signal (/IND) from

INDXSB (index sensor board), the laser write reference position is determined for each scan in the drum rotation direction, and the image is written onto the copy paper according to the copy paper position detected by PS70 (paper mis-centering).

54 MFP unit explanation ENWW

b) Sub scanning direction Specified interval after PS44

(registration) detects the leading edge of the copy paper.

2 Signals

a Input signals

1 /IND (INDXSB to ICB)

This is an index signal used to detect deviation of main scanning.

2 /INDPR (INDXSB to ICB)

This signal monitors the INDXSB (index sensor board) power supply.

[H]: Abnormal [L]: Normal

3 /ALM1 (LDB to ICB)

This signal indicates the state of the laser 1 drive current.

[H]: Normal [L]: Abnormal

4 LPR5V (LDB to ICB)

This signal monitors the LDB (laser driver board) power supply.

[H]: Normal [L]: Abnormal

5 /ALM2 (LDB to ICB)

This signal indicates the state of the laser 2 drive current.

[H]: Normal [L]: Abnormal

b Output signals

1 /S/H1 (ICB to LDB)

APC sampling signal for one line (for laser 1)

2 /ENB1 (ICB to LDB)

Laser APC function ON/OFF control signal (for laser 1)

Laser beam emission stops when it is off.

3 /S/H2 (ICB to LDB)

APC sampling signal for one line (for laser 2)

4 /ENB2 (ICB to LDB)

Laser APC function ON/OFF control signal (for laser 2)

Laser beam emission stops when it is off.

5 VIDEO1/VIDEO1 (ICB to LDB)

Image signal for laser 1

6 VIDEO2/VIDEO2 (ICB to LDB)

Image signal for laser 2 DACLK (ICB to LDB) LDB (laser driver board) MPC value

data transmission clock signal

7 DADI (ICB to LDB)

LDB (laser driver board) signal for MPC

8 DALD (ICB to LDB)

LDB (laser driver board) MPC value memory command signal

MFP unit explanation

ENWW Laser scanner unit 55

Drum unit

Composition

Cleaning/toner recycle section

Charging corona unit

Separation claw SD (SD1)

Developing unit

Drum

PCL

Cleaning/toner recycle section

Transfer and separation corona unit

Mechanisms

Mechanism Method PCL/TSL LED Auxiliary separation *1 Separation claws Transport assistance *2 Ratchet wheel

The drum unit is an integral assembly consisting of a drum, charging corona unit, developing unit, cleaning/toner recycle unit, PCL, and separation claws.

*1 Auxiliary separation

• To prevent paper jamming, three separation claws are used to separate paper from the drum forcibly. These separation claws are pressed against the drum or detached from it by turning on/off the separation claw solenoid (SD1).

Separation claws

Toner guide roller (TGR)

Charging corona unit

Drum

Developing unit

TSL

• To prevent a specific part of image-copied paper from being stained and to prevent the drum from being scratched, the swing mechanism slides the separation claws about 8 mm back and forth in parallel with the drum surface.

Separation claw SD (SD1)

Separation claws

56 MFP unit explanation ENWW

*2 Transport assistance

The thick paper conveyance ability has been improved by the use of ratchets (star wheels).

Separation claw control

MC24V 2

SPSD DRV

P.GND

DRUM CONT

DRUM CLK

CW/CCW

DRUM EM

PRCB

MS1 MS2

24V2

P.GND

DCPS

SD1

2 Signals

a Output signal

1 SPSD_DRV (PRCB to DCDB)

SD1 (separation claw) drive control signal

[L]: SD1 on [H]: SD1 off

Paper guide plate control

GP.CONT

PRCB

MS1 MS2

24V2

P.GND

DCPS

Separation claws are driven by SD1 (separation claw). Separation claws are swung by M2 (drum). SD1 is controlled by PRCB (printer control board).

1 Operation

a Separation claw ON/OFF control

SD1 (separation claw) is a pull-type solenoid powered by 24 VDC. It turns on to press separation claws against the drum to help image-copied paper separate.

1 SD1 (separation claw) operation

timing SD1 turns on after a lapse of

specified time from turning on of PS43 (leading edge) of the second paper feed section. It turns off after a lapse of the time set by PRCB (printer control board).

b Separation claw swing control

Separation claws are swung by M2 (drum) via the cam mechanism.

To prevent toner from adhering to the paper guide plate, a constant voltage is applied to the paper guide plate. This voltage is supplied from HV (high voltage unit) and is controlled by PRCB (printer control board).

1 Operation

a ON/OFF timing

Turning ON/OFF in sync with M2 (drum)

b Applied voltage

-500 VDC

2 Signal

a Output signal

1 GP. CONT (PRCB to HV)

This signal controls turning ON/OFF the voltage application to the paper guide plate.

[L]: Voltage applied [H]: Voltage not applied

MFP unit explanation

ENWW Drum unit 57

Corona unit section

Composition

Transfer entrance

Charging control plate

guide plate

Charging corona wire

Plunging prevention plate (rear)

Separation corona wire

PCL

Charging wire cleaning motor (M14)

Mechanisms Charging control

Mechanism Method Charging Scorotron (DC negative corona

Transfer DC positive corona discharge

Separation AC/DC corona discharge

discharge) Discharging wire: Tungsten, 0.06 mm

diameter (gold-plated skin path, with automatic wire cleaner)

Grid control: Gold-plated stainless plate

Discharging wire: Oxide film tungsten,

0.06 mm diameter, with automatic wire cleaner

Discharging wire: Oxide film tungsten,

0.06 mm dia., with automatic wire cleaner

The current output to the charging wire and the voltage applied to the grid are supplied from HV (high voltage unit) and they are controlled by PRCB (printer control board).

The levels of outputs to these are transmitted using 8-bit serial data. This serial data includes the level information for all outputs driven by HV, excluding the ON/OFF control signal. Accordingly, a separate signal line is provided to turn on/off only the charging wire output and the grid output at the same time.

PRCB

DCPS

C.CONT

EM(C).SIG

TXD CLK

LATCH

24V2

P.GND

MS1 MS2

Guide rollers

Transfer corona wire

Plunging prevention plate (front)

CHARGING

58 MFP unit explanation ENWW

1 Operation

a Charging

A Scorotron charging method is used. 24 VDC supplied from DCPS is raised to a negative DC voltage which is then discharged after being applied to the charging wire.

Charge output range:

-600 µA to -1200 µA

b Grid voltage

The grid voltage is output from HV to the charging plate.

Grid voltage output range: -500 V to

-1000 V

2 Signals

a Input signal

1 EM (C).SIG (HV to PRCB)

This signal indicates the leak or short state of the charging corona unit.

[L]: Normal [H]: Abnormal

b Output signals

1 C.CONT (PRCB to HV)

This signal turns on/off the charging wire.

[L]: Charging voltage on [H]: Charging voltage off

2 TXD (PRCB to HV)

Output level of each high voltage electrode.

Serial data signal for control

3 CLK (PRCB to HV)

Clock signal for TXD

4 LATCH (PRCB to HV)

Latch signal for TXD

Transfer/separation control

T.CONT

EM(T).SIG

S.CONT

EM(S).SIG

TXD

CLK

LATCH

PRCB

MS1 MS2

24V2

P.GND

DCPS

The voltages applied to the transfer wire and separation wire is supplied from HV (high voltage unit) and are controlled by PRCB (printer control board). The levels of outputs to these wires are transmitted using 8-bit serial data. This serial data includes the level information for all outputs driven by HV, excluding the ON/OFF control signal. Accordingly, a separate signal line is provided to turn on/off only the transfer wire or separation wire.

1 Operation

a Transfer

Positive DC high voltage is used for transfer.

Transfer DC output range: 50 µA to 600 µA

b Separation

AC high voltage and negative DC voltage are used for separation.

Separation AC output range: 4kV to

5.7kV

Separation DC output range: 0 µA to

-400 µA

2 Signals

a Input signals

1 EM (T).SIG (HV to PRCB)

This signal indicates the leak or short state of the transfer corona unit.

[L]: Normal [H]: Abnormal

TRANSFER

SEPARATION

MFP unit explanation

ENWW Corona unit section 59

2 EM (S).SIG (HV to PRCB)

This signal indicates the leak or short state of the separation corona unit.

[L]: Normal [H]: Abnormal

b PRCB output signals

1 T.CONT (PRCB to HV)

This signal turns on/off the voltage applied to the transfer wire.

[L]: Transfer voltage on [H]: Transfer voltage off

2 S.CONT (PRCB to HV)

This signal turns on/off the voltage applied to the separation wire.

[L]: Separation voltage on [H]: Separation voltage off

M14 (charger cleaning) control

CHGM A CHGM B

PRCB

24V/1

5V/2 S.GND P.GND

DCPS

M14

b Operation timing

The charging wires are cleaned when SW2 (sub power) is turned on and when the fuser temperature is lower than 50° C. They are also cleaned after the specified copy count is reached.

*Changeable with the 25-mode DIP SW

c Cleaning operation

Normally, the charging wire cleaning unit is on the front side of the machine. It moves back and forth to clean the charging wires. The movement direction is changed by changing the rotational direction of M14 (charge cleaning).

The rotational direction of M14 and the position of the cleaner are detected by monitoring the current value of M14 with PRCB (printer control board).

2 Signals

a Output signal

1 CHGM_A, B (PRCB to M14)

M14 (charger cleaning) drive control signal.

The drive direction of M14 is controlled by switching between the drive current directions of two signals.

Status CHGM_A CHGM_B Forward stroke of

cleaning Backward stroke of

cleaning Stop L L

M14 (charger cleaning) is a DC motor powered by 24 VDC and is controlled by PRCB (printer control board).

1 Operation

a Purpose of driving

M14 (charger cleaning) is used to drive the charging wire cleaning unit.

60 MFP unit explanation ENWW

M10 (transfer/separation cleaning) control

IO DTXD IO DCLK

ADU LATCH

IO UCLK

REQ1

IO URXD

ACK1

ERR OUT1

PRCB

5V2

S.GND

24V1

5V2 S.GND P.GND

DCPS

M10 (transfer/separation cleaning) is a DC motor powered by 24 VDC and is controlled by PRCB (printer control board) via ADUDB (ADU drive board). Between PRCB and ADUDB, signals are exchanged using serial data.

1 Operation

a Purpose of driving

M10 (transfer/separation cleaning) used to drive the transfer/separation wire cleaning pads.

b Operation timing

The transfer/separation wires are cleaned when SW2 (sub power) is turned on or when the fuser temperature is lower than 50° C.

It is also carried out after the specified copy count is reached.

*Changeable with the 25-mode DIP SW

c Cleaning operation

Normally, the transfer/separation wire cleaning pads are on the front side of the machine. They move back and forth to clean the transfer and separation wires. The movement direction is changed by changing the rotational direction of M10 (transfer/separation cleaning).

SEP CLM M A SEP CLM M B

ADUDB

M10

The rotational direction of M10 and the position of the cleaner are detected by monitoring the current value of M10 with PRCB (printer control board).

2 Signals

a Input signals

1 IO_URXD (ADUDB to PRCB)

Serial data used to report the ADUDB (ADU drive board) operation state to PRCB (printer control board)

2 REQ1 (ADUDB to PRCB)

This signal indicates that sending data from ADUDB (ADU drive board) to PRCB (printer control board) is requested.

When ADUDB receives ACK1 and can send data, this signal stands at the [L] level.

3 IO_UCLK (ADUDB to PRCB)

Clock signal for IO_URXD signal

b Output signals

1 SEP_CLM_M A, B (ADUDB to M10)

M10 (transfer/separation cleaning) drive control signal

The drive direction of M10 (transfer/separation cleaning) drive control signal

The drive direction of M10 is controlled by switching between the drive current directions of two signals.

Status SEP_CLM_MA SEP_CLM_MB Forward

stroke of cleaning

Backward stroke of cleaning

Stop L L

MFP unit explanation

ENWW Corona unit section 61

2 IO_DTXD (PRCB to ADUDB)

Serial data used to report the machine operation state understood by PRCB (printer control board) to ADUDB (ADU drive board)

3 IO_DCLK (PRCB to ADUDB)

Clock signal for IO_DTXD signal

4 ADU_LATCH (PRCB to ADUDB)

Latch signal for IO_DTXD signal

5 ACK1 (PRCB to ADUDB)

Reception acknowledgment signal. It is sent each time PRCB (printer control board) receives one-byte data from ADUDB (ADU drive board).

When PRCB receives REQ1 and can receive data, this signal stands at the [L] level.

6 ERR_OUT1 (PRCB to ADUDB)

This signal requires resending of data when PRCB (printer control board) has failed in data reception from ADUDB (ADU drive board) due to an error.

PRCB (printer control board). TSL is driven by ADUDB (ADU drive board). PCL and TSL are controlled by PRCB.

1 Operation

PCL turns on when the START button is pressed. It is turned off after a lapse of the specified time from turning on of PS37 (paper exit). TSL turns on after a lapse of the specified time from turning on of PS43 (leading edge) of the second paper feed section. It turns off after a lapse of the specified time from detection of the trailing edge of copy paper.

2 Signals

a Output signals

1 PCL CONT (PRCB to PCL)

PCL ON/OFF control signal [L]: PCL on [H]: PCL off

2 TSL_DR (ADUDB to TSL)

TSL ON/OFF control signal [L]: TSL on [H]: TSL off

PCL/TSL control

MC 24V2

PCL CONT

IO DTXD

IO DCLK

ADU LATCH

IO UCLK

REQ1

IO URXD

ACK1

ERR OUT1

PRCB

DCPS

S.GND

24V1

P.GND

24V1

S.GND P.GND

5V2

MC24V

TSL DR

ADUDB

LEDs are used for PCL (pre-charging exposure lamp) and TSL (transfer synchronization lamp). PCL is driven by the

62 MFP unit explanation ENWW

PCL

TSL

Developing unit

Composition

Developing unit cover

Agitator screws

Developing sleeve

Developing regulation plate

Mechanisms

Mechanism Method Developing 2-component developer Developing bias DC bias Developer agitation Main agitator

1 Developing drive

The developing motor (M3) drives the following parts via the gear unit at the back:

• Developing sleeve

• Agitator wheel

• Agitator screws

2 Flow of developer

The developer inside the developing unit is supplied to the developing sleeve by the agitator wheel, and maintained at a constant thickness by the developer regulation plate (bristle height regulation plate). The developer remaining on the developing sleeve is returned to the agitator screws.

Auxiliary agitator

Splash prevention sheet (upper)

Developing sleeve

Agitator wheel Agitator

M3 (developing) control

Splash prevention sheet (upper)

Developing regulation plate

Developing sleeve

DEVM CONT

DEVM CLK

DEVM CW/CCW

DEVM GAIN

PRCB

DEVM EM

Agitator wheel Agitator

P.GND

MS1 MS2

24V2

P.GND

Developing regulation plate

screws

MFP unit explanation

DCPS

ENWW Developing unit 63

M3 (developing) is controlled by PRCB (printer control board) and the motor drive power is supplied from DCPS (DC power supply unit).

1 Operation

M3 (developing) is a DC motor driven by 24 V. It drives the developing sleeve, agitator wheel, and agitator screws.

M3 turns on when the PRINT button is pressed, and turns off after lapse of the specified time from turning off of the charging.

2 Signals

a Input signals

1 DEVM_EM (M3 to PRCB)

M3 (developing) abnormality detection signal

[H]: Abnormal rotation (when motor speed changes by 6.5 percent more or less than the motor speed specified value)

[L]: Normal rotation

b Output signals

1 DEVM_CONT (PRCB to M3)

M3 (developing) drive control signal [L]: M3 on [H]: M3 off

2 DEVM_CLK (PRCB to M3)

M3 (developing) rotational speed control clock signal

3 DEVM_CW/CCW (PRCB to M3)

M3 (developing) rotational direction indication signal

[H]: CW direction rotation [L]: CCW direction rotation

4 EDVM_GAIN (PRCB to M3)

M3 (developing) rotational speed range indication signal

[H]: High speed range [L]: Low speed range

Developing bias control

B.CONT

TXD

CLK

LATCH

PRCB

24V1

P.GND

DCPS

The developing bias voltage is supplied from HV (high voltage unit) and is controlled by PRCB (printer control board). The output level of the developing bias voltage is transmitted using 8-bit serial data. This serial data includes the level information for all outputs driven by HV, excluding the ON/OFF control signal. Accordingly, a separate signal line is provided to turn on/off only the developing bias.

1 Operation

Application of the developing bias voltage starts after a lapse of the specified time from turning on of the START button, and stops after a lapse of the specified time from turning off of PS43 (leading edge) by the last copy paper.

Developing bias output range: -300 V to

-700 V

2 Signals

a Output signal

1 B.CONT (PRCB to HV)

Developing bias output ON/OFF control signal.

[L]: Developing bias on [H]: Developing bias off

BIAS

64 MFP unit explanation ENWW

Dmax (maximum contrast) control

TCSB

12V A.GND DMLED CONT DM MONI EX DJLED CONT DM SIG EX DRUM JSIG EX TNLED REF TEMP

3.3V2

DEVM CW/CCW

PRCB

P.GND

DRUM CONT

DRUM CLK

CW/CCW

DRUM EM

P.GND

DEVM CONT

DEVM CLK

DEVM GAIN

DEVM EM

12V2

S.GND

24V2

MS1 MS2

P.GND

DCPS

Dmax (maximum contrast) control is performed by TCSB (toner control sensor board), M2 (drum), M3 (developing), and so on under the control of PRCB (printer control board).

1 Operation

The purpose of Dmax (maximum contrast) control is to adjust the maximum density to the reference level for each machine.

ENWW Developing unit 65

a Dmax (maximum contrast) control

1 Method

Several latent images are created at the maximum laser power, images are developed with the rotational speed of the developing sleeve varied, and then each density is read by the Dmax (maximum contrast) sensor (PD1) on TCSB (toner control sensor board).

MFP unit explanation

The developing sleeve speed detected when the density has reached the reference level is recorded as the optimum sleeve speed, allowing developing to be performed at this sleeve speed.

2 Timing

a) When the fuser temperature is lower than 50° C (122° F) at SW2 (sub power) on

b) Every 10,000 prints, upon completion of the last job.

2 Signals

a Input signals

1 DM_SIG_EX (TCSB to PRCB)

Output voltage of Dmax (maximum contrast) detection sensor (PC1) on TCSB (toner control sensor board)

Reference voltage: 2.5 V

2 DM_MONI_EX (TCSB to PRCB)

This signal monitors the light reflected by the drum surface (without toner).

The voltage applied to the Dmax (maximum contrast) detection LED is corrected by TNLED_REF so that the output voltage becomes 1.9 V (calibration).

Reference voltage: 1.9 V <Timing> Before Dmax (maximum contrast)

correction

3 DRUM_JSIG_EX (TCSB to PRCB)

This signal detects a jam caused by paper wrapping around the drum. A jam is detected when the voltage becomes 4.0 V or more.

4 TEMP, 3.3V2 (TCSB to PRCB)

Drum temperature detection signal

b Output signals

1 DMLED CONT (PRCB to TCSB)

Dmax (maximum contrast) LED ON/OFF control signal

[L]: LED on [H]: LED off

2 TNLED_REF (PRCB to TCSB)

Power supply line for PD1 LED on TCSB.

The voltage is adjusted so that the Dmax (maximum contrast) MONI signal becomes 1.9 V.

3 DJLED_CONT (PRCB to TCSB)

JAM LED ON/OFF control signal [L]: LED on [H]: LED off

66 MFP unit explanation ENWW

Gradation correction control

TCSB

12V A.GND

G SIG EX LED CONT

TNLED REF

P.GND

DRUM CONT

DRUM CLK

CW/CCW

DRUM EM

P.GND

DEVM CONT

DEVM CLK

DEVM CW/CCW

DEVM GAIN

DEVM EM

PRCB

12V2

S.GND

24V2

MS1 MS2

P.GND

DCPS

Gradation correction control is performed by TCSB (toner control sensor board), M2 (drum), M3 (developing), and so on under the control of PRCB (printer control board).

1 Operation

The gradation characteristics of the toner density versus exposure amount at the image-forming section (drum area) are detected to obtain a linear relation between the image density on a document and the copying image density.

ENWW Developing unit 67

a Method

Exposure is performed with the laser PWM varied in several steps, and development is performed at the sleeve speed obtained by Dmax (maximum contrast) correction.

Next, each density is read by the γ sensor (PD2) on TCSB (toner control sensor board) to detect the gradation characteristics of image density.

The gradation characteristics obtained here are used as the values for correcting the laser exposure amount.

MFP unit explanation

Gradation correction control must be performed in two ways: 1-dot PWM (for normal mode) and 2-dot PWM (for photo mode).

b Timing

1 When the fuser temperature is lower

than 50° C at SW2 (sub power) on

2 Every 5,000 prints, upon completion

of the last job.

2 Signals

a Input signals

1 G_SIG_EX (TCSB to PRCB)

This signal monitors the output voltage from the γ sensor (PD2) on the TCSB (toner control sensor board) as well as the light reflected by the drum surface (without toner).

The voltage applied to the gradation detection LED is corrected by TNLED_REF so that the output voltage becomes 3.0 V (calibration).

Reference voltage: 3.0 V <Timing> Before gradation correction.

b Output signal

1 γ LED CONT (PRCB to TCSB)

Gradation detection LED ON/OFF control signal

[L]: LED on [H]: LED off

Dot diameter correction control

12V A.GND

G SIG EX LED CONT

TNLED REF

TCSB

12V2

S.GND

DCPS

Dot diameter is detected by TCSB (toner control sensor board) and is controlled by PRCB (printer control board).

1 Operation

Dot diameter correction is performed to prevent the 1-dot laser beam diameter from fluctuating due to the change in developing characteristics (caused by deteriorated developer) and soil in the laser scanner unit.

a Method

Multiple dot pattern patches with the same condensation are created to be read by the γ sensor (PD2). The laser power where the γ sensor output reaches the reference voltage is used as the MPC value.

b Timing

1 Every 10,000 prints, upon completion

of the last job.

PRCB

68 MFP unit explanation ENWW

Toner density control

FM4 (developing suction) control

PRCB

DCPS

TNSM24V TNSM24V

TNSM A

TNSM AB

TNSM B

TNSM BB

24V1

5V2 S.GND P.GND

M12

TCSB

12V A.GND DMLED CONT DM MONI EX DJLED CONT DM SIG EX DRUM JSIG EX TNLED REF TEMP

3.3V2

The density of toner is controlled by controlling M12 (toner supply) from PRCB (printer control board).

1 Operation

a Toner density detection

The reference patch density is detected using the patch detection method of TCSB (toner control sensor board) and the corresponding analog voltage signal is output to PRCB (printer control board), thus detecting the toner density.

The PRCB compares the detected voltage with the reference value to determine whether toner must be added.

b Toner supply operation

Upon read of the patch, M12 (toner supply) is turned on to supply toner. The time needed to add toner depends on the paper size.

2 Signals

a Output signals

1 TNSM_A, AB (PRCB to M12)

A-phase drive signal of M12 (toner supply)

2 TNSM_B, BB (PRCB to M12) B-phase drive signal of M12 (toner

supply)

SUCTFAN D

SFAN EM

P.GND

FM4

PRCB

24V1

5V2 S.GND P.GND

DCPS

FM4 (developing suction) is controlled by PRCB (printer control board).

1 Operation

a ON timing

FM4 (developing suction) is turned on when M2 (drum) is turned on.

b OFF timing

FM4 (developing suction) is turned off after a lapse of the specified time from turning off of M2 (drum).

2 Signals

a Input signal

1 FM2 EM (FM4 to PRCB)

FM4 (developing suction) abnormality detection signal

[L]: FM4 is normal. [H]: FM4 is abnormal.

b Output signal

1 SUCTFAN_D (ACDB to FM4)

FM4 (developing suction) drive signal [L]: FM4 off [H]: FM4 on

MFP unit explanation

ENWW Developing unit 69

Toner supply unit

Composition

Mechanisms

Mechanism Method Toner supply Supply by screw Toner level detection Piezoelectric method

100 ± 25 g

Toner agitation*1 Agitator plate Toner bottle*2 Rotary cartridge

Capacity: 1000 g

Toner leakage prevention Toner supply shutter

*1 Toner agitation

Toner agitator plates are driven by the following two motors through the gear unit:

a Toner supply motor (M12): Drives the

toner supply screws.

b Toner bottle motor (M13): Drives the

toner bottle.

The agitator plates prevent toner from solidifying and collecting on the toner level detection sensor (TLD).

*2 Toner bottle

When the toner bottle rotates, toner is fed to the outlet of the bottle through the spiral groove on the surface of the toner bottle. When the outlet of the bottle

70 MFP unit explanation ENWW

faces downward, toner flows out of the outlet into the agitation/conveyance section of the toner supply unit.

Outlet

90 rotation

To agitation/conveyance block of toner supply unit

Toner level detection control

S.GND

TONER SIG

T SENSE CONT

P.GND

TONERM CONT

TONERM CLK

TONERM CW/CCW

TONERM EM

PRCB

MS1 MS2

24V2

P.GND

DCPS

Toner level detection is controlled by the TLD (toner level detection sensor) and the PRCB (printer control board).

1 Operation

a Toner level detection

A piezoelectric device is used as the TLD (toner level detection sensor).

When the level of toner in the hopper becomes low, the toner supply signal is output to PRCB (printer control board). As a result, a message is displayed on the LCD connected to OB1 (operation board/1).

TLD

M13

b Detection timing

The detection timing is as follows:

• Power-on

• When the front door opens or closes

• During copying

c Toner supply to toner supply unit

When the no toner state is detected by TLD (toner level detection sensor), M13 (toner bottle) is turned on to supply toner from the toner bottle to the toner supply unit.

d Detection of no toner state in toner

bottle If the no toner state is detected by TLD

(toner level detection) after M13 has been held on for a specified period of time, the toner bottle is assumed to be empty.

2 Signals

a Input signals

1 TONER_SIG (TLD to PRCB)

When the level of toner in the toner supply unit becomes low, this signal goes low ([L]), displaying a message on the LCD connected to OB1 (operation board/1).

2 TONERM_EM (M13 to PRCB)

M13 (toner bottle) abnormality detection signal

[L]: M13 is normal. [H]: M13 is abnormal.

b Output signals

1 T_SENSE_CONT (PRCB to TLD)

TLD (toner level detection sensor) power control signal

The TLD is powered only when it is detecting the toner level.

MFP unit explanation

ENWW Toner supply unit 71

2 TONERM_CONT (PRCB to M13)

M13 (toner bottle) control signal [L]: M13 on [H]: M13 off

3 TONERM_CLK (PRCB to M13)

M13 (toner bottle) rotation speed control clock signal

4 TONERM_CW/CCW (PRCB to M13)

M13 (toner bottle) rotational direction indication signal

[H]: CW direction rotation [L]: CCW direction rotation

M12 (toner supply) control

TNSM24V TNSM24V

TNSM A

TNSM AB

TNSM B

TNSM BB

12V

A.GND

DMLED CONT

DM MONI EX DJLED CONT

DM SIG EX

DRUM JSIG EX

TNLED REF

M12

TCSB

1 Operation

a Toner density detection

The Dmax (maximum contrast) sensor (PD1) on the TCSB (toner control sensor board) detects the density of the toner control patch developed on the drum surface to output the signal corresponding to the detected density to PRCB (printer control board).

b Toner supply

When the voltage detected by TCSB (toner control sensor board) is below the specified value, PRCB issues a control signal to drive M12 (toner supply). The relationship between the paper size and toner supply time is summarized in the following table:

Paper size Supply time (seconds) A3 1.30 B4 0.98 F4 0.98 A4 0.65 B5 0.49 B5R 0.49 A5 0.33 11 by 17 1.30

8.5 by 14 0.98

8.5 by 11 0.65

5.5 by 8.5 0.49

PRCB

24V1

5V2 S.GND P.GND

DCPS

M12 (toner supply) is controlled by the PRCB (printer control board). Toner density is detected by TCSB (toner control sensor board).

72 MFP unit explanation ENWW

Cleaning/toner recycle unit

Composition

Cleaning blade

Toner recycle MC (MC14)

Cleaning/toner recycle section

Toner guide roller (TGR)

Cleaning blade

Scraper

Toner conveyance screw

Mechanisms

Mechanism Method Drum cleaning Cleaning blade Toner collection *1 Toner guide roller (TGR) Toner recycle Screw conveyance + toner

*1 Toner collection

recycle MC (MC14)

force from the toner conveyance screw. This prevents excessive recycled toner from being conveyed to the developing unit.

HV Terminal

Separation claw

Cleaning blade

Drum

Toner removed by the cleaning blade is collected by the toner guide roller (TGR) and removed by the scraper, then conveyed by the toner conveyance screw to be reused. High pressure is applied to the toner guide roller (TGR) to enhance the toner cleaning ability.

*2 Toner recycle

When the drum performs preliminary rotation as warm-up, toner recycle MC

Toner guide roller (TGR)

(MC14) is turned off, stopping the drive

ENWW Cleaning/toner recycle unit 73

MFP unit explanation

Toner guide roller (TGR) control

TGR.CONT

TXD CLK

LATCH

PRCB

MS1 MS2

24V2

P.GND

DCPS

To enhance the toner cleaning ability, voltage is applied to the TGR (toner guide roller). This voltage is applied by HV (high voltage unit) under the control of PRCB (printer control board). The output level of the applied voltage is transmitted using 8-bit serial data. This serial data includes the level information for all outputs driven by the HV unit excluding the ON/OFF control signal. Accordingly, a separate signal line is provided to turn on/off only the TGR.

1 Operation

a ON/OFF timing

The TGR is turned on/off in sync with M2 (drum).

b TGR (toner guide roller) output range

0 to 50 µA

2 Signals

a Output signal

1 TGR.CONT (PRCB to HV)

TGR (toner guide roller) voltage ON/OFF control signal

[L]: Voltage is applied. [H]: Voltage is not applied.

TGR

Other control

To improve durability of the cleaning blade, the following control is performed:

1 Blade setting mode

A blade setting mode is available in the 36 mode.

This mode will perform a task that is required after blade replacement during maintenance, and so forth. When this mode is used, toner adheres on the drum and then the blade cleans the drum, preventing blade peeling.

2 Black stripe creation control

To improve durability of the blade (stabilize load and stabilize paper dust crushing), a black stripe of toner is adhered on the drum once every 10 copies and then cleaned.

*Changeable with the 25-mode DIP SW

74 MFP unit explanation ENWW

Tray 2/3 paper feed unit

Composition

Note Trays 2 and 3 have the same shape and mechanisms.

Mechanisms

Mechanism Method Paper lift-up *1 Up: Driven by wires

Down: Falls down by its own

weight Tray loading Front loading Double feed prevention Torque limiter 1st paper feed Pick roller No paper detection Photosensor + Actuator Paper size detection *2 (Universal)

1st paper feed paper loop mechanism*3

Width: VR

Length: Photosensor +

actuators (two)

Photosensor + Actuator

+ clutch

up/down plate in the tray moves up. When the tray upper limit PS/1(PS2)/2(PS8) detects the actuator of the roller that has been moved up by paper, the tray up drive motor/1(M16)/2 (M17) stops.

b Lowering of tray

When the paper feed tray is pulled out, the coupling shaft of the tray is disengaged from the coupling gear of the tray up drive motor on the MFP side, allowing the up/down plate in the tray to fall down by its own weight.

*1 Paper lift-up

a Hoisting of up/down plate

Paper feed trays are driven by wires. When a paper tray is loaded, the tray up drive motor/1(M16)/2(M17) rotates to wind the wires around the drive pulleys and consequently the

ENWW Tray 2/3 paper feed unit 75

MFP unit explanation

Coupling gear

[Main body side]

Coupling

*2 Paper size detection

Length: When paper pushes the paper size detection actuator, the paper size PS/2-1/2-2 (PS6/PS12) and the paper size PS/1-1/1-2 (PS5/PS11) turn on. Thus, the paper size is automatically determined according to the combination of the on/off states of these PSs.

Width: When the side guides of the tray are slid, the rack gear of the side guide (front) turns the paper size VR/1/2 gear. Thus, the paper size is automatically determined according to the change in the resistance value of the VR.

[Tray side]

*3 First paper feed paper loop

mechanism

When paper feed starts, paper is fed to the pre-registration roller by the feed roller and pick rollers. The fed out paper operates the actuator of the paper feed PS/1 (PS1), the paper feed PS/2 (PS7) turning it on. The feed and pick rollers remain on for a specified time after the actuation of the paper feed PS/1 (PS1) and PS/2 (PS7), causing a paper loop to form against the pre-registration rollers which are not turning. In this way, paper skew is corrected.

Paper size VR gear

Rack gear

Side guide (front)

76 MFP unit explanation ENWW

First paper feed control

The 1st paper feed from Tray 2/3 takes place as the result of the transmission of the drive force from M1 (paper feed) to each pick roller by MC3/5 (paper feed MC/1/2) and MC4/6 (pre-registration MC/1/2). The feed roller picks up paper using its own weight.

The above operations are controlled by the PRCB (printer control board). Related signals are PS1/7 (paper feed/1/2) and PS25/26 (vertical conveyance/1/2) issued from the vertical conveyance section.

1 Operation

a Operation of the MC3/5 (paper feed

MC/1/2) 1 Start timing of printing of the first copy

MC3/5 (paper feed MC/1/2) turns on at the timing that is determined by the P Counter from when copying starts, and turns off after a lapse of the specified time from PS1/7 (paper feed/1/7) turning off. Thus, paper skew is corrected by forming the loop before pre-registration roller.

2 Start timing of printing of the second

copy When the preceding paper turns off

PS1/7

3 OFF timing

When PS1/7 is turned on

b Operation of the MC4/6 (pre-registration

MC1/2) 1 ON timing

After a specified time from MC3/5 (paper feed MC/1/2) turning on

2 OFF timing

When PS1/7 (paper feed/1/2) is turned off

2 Signals

a PRCB input signals

1 T1PRE_PS (PS1 to PRCB)

Paper passage detection signal (Tray 2)

[L]: Detected [H]: Not detected

MFP unit explanation

ENWW Tray 2/3 paper feed unit 77

2 T2PRE_PS (PS7 to PRCB)

Paper passage detection signal (Tray 3)

[L]: Detected [H]: Not detected

b PRCB output signals

1 T1FEED_DRV (PRCB to MC3)

MC3 drive control signal (Tray 2) [L]: MC3 on [H]: MC3 off

2 T1PREMC_DRV (PRCB to MC4)

MC4 drive control signal (Tray 2) [L]: MC4 on [H]: MC4 off

3 T2FEED_DRV (PRCB to MC5)

MC5 drive control signal (Tray 3) [L]: MC5 on [H]: MC5 off

4 T2PREMC_DRV (PRCB to MC6)

MC6 drive control signal (Tray 3) [L]: MC6 on [H]: MC6 off

78 MFP unit explanation ENWW

Paper up drive control

Paper stacked in the tray is pushed up by transmitting the drive force of M16/17 (tray up drive/1/2) to the up/down plate in the tray via drive wires. M16/17 are controlled by the PRCB (printer control board). Related signals are PS2/8 (tray upper limit/1/2) and PS4/10 (remaining paper/1/2).

1 Operation

a Paper up drive control

When Tray 2/3 is loaded, M16/17 (tray up drive/1/2) turns on to lift the up/down plate in the tray. When PS2/8 (tray upper limit/1/2) detects the upper limit of paper as the paper up/down plate in the tray goes up, it turns on and consequently M16/17 goes off, causing the tray to stop going up. When PS2/8 turns off after paper is fed, M16/17 goes on again to move the paper up/down plate upward. The up/down plate in the tray is lowered mechanically by its own weight.

b Paper up drive timing

1 ON timing

M16/17 (tray up drive/1/2) is turned on when loading of a tray is detected (by shorting wires at both ends of the drawer connector).

2 OFF timing

One of M16/17 (tray up drive/1/2) is turned off when PS2/8 (tray upper limit/1/2) is turned on.

c Remaining paper detection control

The level of paper remaining in each tray is detected according to the time that M16/17 (tray up drive/1/2) requires to lift up the up/down plate when the tray is set. This lift-up time (operation time of M16/17) is saved in the PRCB (printer control board). After this, the remaining paper is detected using the paper feed counter. The detected remaining paper level is displayed on the control panel in five steps. PS4/10

MFP unit explanation

ENWW Tray 2/3 paper feed unit 79

(remaining paper/1/2) are used to detect the remaining paper level when it lowers below about 10 percent.

2 Signals

a PRCB input signals

1 TIUP_PS (PS2 to PRCB)

Paper upper limit detection signal (Tray 2)

[L]: Not detected [H]: Detected

2 TIRM_PS (PS4 to PRCB)

Remaining paper detection signal (Tray 2)

[L]: Not detected [H]: Detected

3 TIUP_PS (PS8 to PRCB)

Paper upper limit detection signal (Tray 3)

[L]: Not detected [H]: Detected

4 TIRM_PS (PS10 to PRCB)

Remaining paper detection signal (Tray 3)

[L]: Not detected [H]: Detected

b PRCB output signals

1 T1RISEM_24V (PRCB to M16)

M16 ON/OFF control signal (Tray 2)

2 T2RISEM_24 (PRCB to M17)

M17 ON/OFF control signal (Tray 3)

Paper size detection control

The paper size in Tray 2/3 is detected using PS5/6/11/12 (paper size/1-1/2-1/1-2/2-2), and VR1/2 (paper size/1/2). Based on the detection signals, the PRCB (printer control board) judges the paper size.

1 Operation

The length of paper is detected using PS5/6/11/12 (paper size/1-1/2-1/1-2/2-2). Variable resistors (VR1/2) interlocked with the guide position are installed at the bottom of the tray to detect the width of paper.

The relationships between the sensors and paper sizes (lengths) are as follows:

Paper size Sensor

PS5/11 OFF ON ON PS6/12 OFF OFF ON

8.5 by 11 or less

A4R to B5R

F4 or larger

80 MFP unit explanation ENWW

2 Signals

a PRCB input signals

3 T1SIZE_S_PS (PS5 to PRCB)

Paper size detection signal (Tray 2) [L]: Paper does not exist. [H]: Paper exists.

4 T1SIZE_L_PS (PS6 to PRCB)

Paper size detection signal (Tray 2) [L]: Paper does not exist [H]: Paper exists

5 T2SIZE_L_PS (PS11 to PRCB)

Paper size detection signal (Tray 3) [L]: Paper does not exist [H]: Paper exists

6 T2SIZE_S_PS (PS12 to PRCB)

Paper size detection signal (Tray 3) [L]: Paper does not exist

[H]: Paper exists

7 T1SIZE_VR (VR1 to PRCB)

Paper width detection signal (Tray 2)

8 T2SIZE_VR (VR2 to PRCB)

Paper width detection signal (Tray 3)

No paper detection control

5V3

T1_0PS

SGND

5V3

T2_0PS

SGND

PRCB

No paper in the tray is detected by PS3 (no paper/1) and PS9 (no paper/2) which are controlled by the PRCB (printer control board).

1 Operation When the tray becomes empty, PS3/9 (no

paper/1/2) is turned off, displaying a message on the LCD via OB1 (operation board/1).

2 Signals

a PRCB input signals

1 T1_0PS (PS3 to PRCB)

No paper detection signal (Tray 2) [L]: Paper does not exist in tray. [H]: Paper exists in tray.

2 T2_0PS (PS9 to PRCB)

No paper detection signal (Tray 3) [L]: Paper does not exist in tray. [H]: Paper exists in tray.

PS3

PS9

5V2 S.GND

DCPS

ENWW Tray 2/3 paper feed unit 81

MFP unit explanation

Tray 4 paper feed unit

Composition

Mechanisms

Mechanism Method Paper lift-up *1 Up: Driven by wires

Down: Falls down by its own

weight Tray loading Front loading Double feed

prevention First paper feed Pick roller No paper detection Photosensor + actuator Paper size detection

*2 (Universal)

First paper feed Paper loop mechanism*3

Torque limiter

Width: VR

Length: Photosensor

+ actuators (two)

Photosensor + actuator

+ magnetic clutch

up/down plate in the tray moves up. When the tray upper limit PS/3 (PS14) detects the actuator of the roller that has been moved up by paper, the tray up drive motor 3 (M18) stops.

b Lowering of tray

*1 Paper lift-up

a Hoisting of up/down plate

paper feed tray is driven by wires. When the paper tray is loaded, the tray up drive motor 3 (M18) rotates to wind the wires around the drive pulleys and consequently the

82 MFP unit explanation ENWW

Coupling gear

[Main body side]

Coupler

*2 Paper size detection

Length: When paper pushes the paper size detection actuator, the paper size PS/1-3/ (PS18) and the paper size PS2-3 (PS17) turns on. Thus, the paper size is automatically determined according to the combination of the on/off states of this PS.

Width: When the side guides of the tray are slid, the rack gear of the side guide (front) turns the paper size VR3 gear. Thus, the paper size is automatically determined according to the change in the resistance value of the VR.

[Tray side]

*3 First paper feed paper loop

mechanism

When paper feed starts, paper is fed to the pre-registration roller by the feed roller and pick rollers. The fed out paper operates the actuator of the paper feed PS/3 (PS13), turning it on. The feed and pick rollers remain on for a specified time after the actuation of the paper feed PS/3 (PS13) causing a paper loop to form against the pre-registration rollers which are not turning. In this way paper skew is corrected.

Paper size VR gear

Rack gear

Side guide (front)

ENWW Tray 4 paper feed unit 83

MFP unit explanation

First paper feed control

The first paper feed from Tray 4 takes place as the result of the transmission of the drive force from M1 (paper feed) to each pick roller by MC7 (paper feed MC/3) and MC8 (pre-registration MC/3). The feed roller picks up paper using its own weight.

The above operations are controlled by the PRCB (printer control board). Related signals are PS13 (paper feed/3) and PS27 (vertical conveyance/3) issued from the vertical conveyance section.

1 Operation

a Operation of the MC7 (paper feed

MC/3) 1 Start timing of printing of the first copy

MC7 (paper feed MC/3) turns on at the timing that is determined by the P counter from when copying starts, and turns off after a lapse of the specified time from PS13 (paper feed/3) turning off. Thus, paper skew is corrected by forming the loop before pre-registration roller.

2 Start timing of printing of the second

copy When the preceding paper turns off

PS13.

3 OFF timing

When PS13 is turned on.

b Operating of the MC8 (pre-registration

MC/3) 1 ON timing

After a specified time from the MC7 (paper feed MC/5).

2 OFF timing

When PS13 (paper feed/3) is turned off.

84 MFP unit explanation ENWW

2 Signals

a PRCB input signals

1 T3PREM_PS (PS13 to PRCB)

Paper passage detection signal (Tray 4)

[L]: Detected [H]: Not detected

b PRCB output signals

1 T3FEED_DRV (PRCB to MC7)

MC7 drive control signal (Tray 4) [L]: MC7 on [H]: MC7 off

2 T3PREM_PS (PRCB to MC8)

MC8 drive control signal (Tray 4) [L]: MC8 on [H]: MC8 off

ENWW Tray 4 paper feed unit 85

MFP unit explanation

Paper up drive control

Paper stacked in the tray is pushed up by transmitting the drive force of M18 (tray up drive/3) to the up/down plate in the tray via drive wires. M18 is controlled by the PRCB (printer control board). Related signals are PS14 (tray upper limit/3) and PS16 (remaining paper/3).

1 Operation

a Paper up drive control

When Tray 4 is loaded, M18 (tray up drive/3) turns on to lift the up/down plate in the tray. When PS14 (tray upper limit/3) detects the upper limit of paper as the paper up/down plate in the tray goes up, it turns on and consequently M18 goes off, causing the tray to stop going up. When PS14 turns off after paper is fed, M18 goes on again to move the paper up/down plate upward. The up/down plate in the tray is lowered mechanically by its own weight.

b Paper up drive timing

1 ON timing

M18 (tray up drive /3) is turned on when loading of a tray is detected. (by shorting wires at both ends of the drawer connector)

2 OFF timing

M18 (tray up drive/3) is turned off when PS14 (tray upper limit/3) is turned on.

c Remaining paper detection control

The level of paper remaining in the tray is detected according to the time that M18 (tray up drive/3) requires to lift up the up/down plate when the tray is set. This lift-up time (operation time of M18) is saved in the PRCB (printer control board). After this, the remaining paper is detected using the paper feed counter. The detected remaining paper level is displayed on the control panel in five steps. PS16 (remaining paper/3) is used to detect the remaining paper level when it lowers below about 10 percent.

86 MFP unit explanation ENWW

2 Signals

a PRCB input signals

1 TIUP_PS (PS14 to PRCB)

Paper upper limit detection signal [L]: Not detected [H]: Detected

2 TIRM_PS (PS16 to PRCB)

Remaining paper detection signal [L]: Not detected [H]: Detected

b PRCB output signals

1 T3RISEM_24 (PRCB to M18)

M18 ON/OFF control signal

Paper size detection control

The relationships between the sensors and paper sizes (lengths) are as follows:

Paper size Sensor PS17 OFF ON ON PS18 OFF OFF ON

8.5 by 11 or less

A4R to B5R F4 or larger

2 Signals

a PRCB input signals

1 T3SIZE_S_PS (PS17 to PRCB)

Paper size detection signal [L]: Paper does not exist. [H]: Paper exists.

2 T3SIZE_L_PS (PS18 to PRCB)

Paper size detection signal [L]: Paper does not exist. [H]: Paper exists.

3 T3SIZE_VR (VR3 to PRCB)

Paper width detection signal

No paper detection control

5V3

The paper size in Tray 4 is detected using

PRCB

T3_0PS

SGND

PS15

5V2 S.GND

DCPS

PS17 (paper size/1-3), PS18 (paper size/2-3), and VR3 (paper size/3). Based on the detection signals, the PRCB (printer control board) judges the paper size.

1 Operation

The length of paper is detected using PS17/18 (paper size/1-3/2-3). Variable resistor (VR3) interlocked with the guide position is installed at the bottom of the

No paper in the tray is detected by PS15 (no paper/3), and which is controlled by the PRCB (printer control board).

1 Operation

When the tray becomes empty, PS15 (no paper/3) is turned off, displaying a message on the LCD via OB1 (operation board/1).

tray to detect the width of paper.

ENWW Tray 4 paper feed unit 87

MFP unit explanation

2 Signals

a PRCB input signals

1 PS15 (PS15 to PRCB)

No paper detection signal [L]: Paper does not exist in tray. [H]: Paper exists in tray

88 MFP unit explanation ENWW

Tray 1 (bypass tray)

Composition

Mechanisms

Mechanism Method First paper feed Tray 1 feed roller Paper lift-up *1 Paper up/down plate

Up/down motor/BP (M20) + Upper/lower limit detection

sensor Double feed prevention Torque limiter No paper detection Photo sensor + actuator Paper size detection *2 Width: VR

Length: Photo sensor +

actuators (two)

*1 Paper lift-up

The up/down motor/BP (M20) drives the paper up/down plate via gears. Paper is automatically pushed up to the paper feed position, when the print start button is pressed. When paper is removed or exhausted M20 will drive down the up/down plate.

Paper up/down plate

Up/down motor/BP (M20)

*2 Paper size detection

The paper size is automatically detected by the following three sensors:

• Lateral: Paper size detection VR/BP (VR5)

• Longitudinal: Paper size PS/1, 2-BP (PS31/32)

MFP unit explanation

ENWW Tray 1 (bypass tray) 89

Paper size VR/BP (VR5)

Paper size PS/2-BP (PS32)

Paper size PS/1-BP (PS31)

By-pass tray

First paper feed control

24V

24V2

P.GND

5V2

S.GND

PRCB

The first paper feed from Tray 1 takes place as the result of the transmission of the drive force from M6 (loop roller) to the pick roller. M6 is controlled by PRCB (printer control board). The related signal is PS36 (loop).

1 Operation

a When printing of the first copy starts

M6 (loop) is turned on at the timing that is determined by the P counter (that starts when printing starts), thus starting feed of paper.

M6 is stopped temporarily after lapse of a specified time from turning on of PS44 (registration) by the leading edge of

24V

5V3

LOOP_PS

S.GND

5V2

2ND_PS

S.GND

PS36

PS44

Second paper feed unit

paper, a loop is formed by registration rollers, and the paper is fed to the transfer unit.

b When printing of the second or

subsequent copy After lapse of the specified time from turning off of PS44 (registration) by the trailing edge of the preceding paper.

2 Signals

a PRCB input signals

1 LOOP_PS (PS36 to PRCB)

Paper passage detection signal [L]: Paper does not exist. [H]: Paper exist.

2 2ND_PS (PS44 to PRCB)

Second paper feed reference timing detection signal

[L]: Paper exists. [H]: Paper does not exist.

b PRCB output signals

1 A and /A (PRCB to M6)

A-phase drive control pulse signal for M6

2 B and /B (PRCB to M6)

B-phase drive control pulse signal for M6

Paper up/down control

5V3

PS34

PS35

BPUP_PS SGND

5V3 BPDN_PS SGND

Paper in Tray 1 is pushed up/down by M20 (up/down motor/BP). M20 is controlled by PRCB (printer control board). Related signals are PS34 (tray upper limit /BP) and PS35 (tray lower limit /BP).

PRCB

BPUDM_A BPUDM_B

M20

5V2 S.GND

DCPS

90 MFP unit explanation ENWW

1 Operation

a Paper up/down control

M20 (up/down motor/BP) is turned on to push up paper. When PS34 (tray upper limit/BP) detects the paper upper limit and turns on, M20 turns off to stop pushing up paper. When paper is fed and consequently PS34 turns off, M20 turns on again, maintaining the upper limit position of paper.

b Paper up timing

1 ON timing

At start of copying

2 OFF timing

M20 (up/down motor/BP) is turned off when PS34 (tray upper limit /BP) is turned on.

c Paper down timing

1 ON timing

When there is no paper or a paper jam occurs.

2 OFF timing

M20 (up/down motor/BP) is turned off when PS35 (tray lower limit/BP) is turned on.

2 Signals

a PRCB input signals

1 BPUP_PS (PS34 to PRCB)

Paper upper limit position detection signal (Tray 1)

[L]: Not detected [H]: Detected

2 BPDN_PS (PS35 to PRCB)

Paper lower limit position detection signal (Tray 1)

[L]: Not detected [H]: Detected

b PRCB output signal

1 BPUDM_A, B (PRCB to M20)

M20 drive control signal

Paper size detection control

5V2

S.GND

DCPS

PRCB

The size of paper in the Tray 1 is detected by PS31 (paper size/1-BP), PS32 (paper size/2-BP), and VR5 (paper size/BP). Based on the detection signals, PRCB (printer control board) judges the paper size.

1 Operation

The length of paper is detected by PS31 (paper size/1-BP) and PS32 (paper size/2-BP). Tray 1 is provided with a variable resistor (VR5) interlocked with the guide position to judge the paper width according to the change in the resistance value.

The relationships between the sensors and paper sizes (lengths) are as follows:

Paper size Sensor PS31 OFF ON ON PS32 OFF OFF ON

8.5 by 11 or less

2 Signals

a PRCB input signals

1 BPSIZE_S_PS (PS31 to PRCB)

Paper size detection signal [L]: Paper does not exist. [H]: Paper exists.

5V3

BPSIZE_S_PS

SGND

5V3

BPSIZE_L_PS

SGND

5VA

BPSIZE_VR

A4R to B5R

PS31

PS32

VR5

F4 or larger

MFP unit explanation

ENWW Tray 1 (bypass tray) 91

2 BPSIZE_L_PS (PS32 to PRCB)

Paper size detection signal [L]: Paper does not exist. [H]: Paper exists.

3 BPSIZE_VR (VR5 to PRCB)

Paper width detection signal

No paper detection control

S.GND

DCPS

5V2

PRCB

5V3

BP_OPS

SGND

PS33

No paper in the tray is detected by PS33 (no paper/BP) which is controlled by PRCB (printer control board).

1 Operation

When the tray becomes empty, PS33 (no paper/BP) is turned off, displaying a message on the LCD via OB1 (operation board/1).

2 Signal

a Input signal

1 BP_0PS (PS33 to PRCB)

No paper detection signal [L]: Paper does not exist. [H]: Paper exists.

92 MFP unit explanation ENWW

HP (Hewlett-Packard) 9065, 9055 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

service manual

Contents

How to use this manual

Manual contents

Manual organization

Safety

Safety and important warning items

Important notices

Description items for Warning, Caution, and Note

Safety warnings

Power supply

Installation requirements

Measures to take in case of an accident

Conclusion

Regulatory statements

Safety information

Safety circuits

Overall protection circuit

Safety labels on the MFPs

Scanner section

Laser/scanner assembly

Rear cover

MFP overview

Overview of system

Type

Functions

Applicable copy paper

Options

Particulars of machine

Maintenance and life

Environmental conditions

Central cross-sectional view

Drive system diagram

Fuser/web drive section

Drum drive section

Developing drive section

Paper feed/vertical conveyance/tray up drive sections

Charging and transfer/separation wire cleaning drive section

Automatic Duplex Unit (ADU) conveyance drive section

Paper exit drive section

Toner supply drive section

Optics drive section

MFP unit explanation

External section

Composition

Drive section

Composition

Mechanisms

M2 (drum) control

M4 (fuser) control

Scanner section

Composition

Mechanisms

M11 (scanner) control

Exposure control

Original read control

APS control

AE control

Laser scanner unit

Composition

Mechanisms

M15 (polygon) control

Image write control

Drum unit

Composition

Mechanisms

Separation claw control

Paper guide plate control

Corona unit section

Composition

Mechanisms Charging control

Transfer/separation control

M14 (charger cleaning) control

M10 (transfer/separation cleaning) control

PCL/TSL control

Developing unit