Ricoh FT7770 User manual

RICOH FT7770

SERVICE MANUAL

RICOH COMPANY, LTD.

TABLE OF CONTENTS

SECTION 1:

OVERALL MACHINE INFORMATION

MAIN SPECIFICATIONS

GUIDE TO COMPONENTS

Copier Exterior

Copier Interior

Operation Panel

HOW TO USE THE GUIDANCE DISPLAY

DISPLAY CONTROL KEYS

THE COPY CYCLE

COPY PROCESSES AROUND THE DRUM

PAPER PATH

MECHANICAL COMPONENT LAYOUT

ELECTRICAL COMPONENT LAYOUT

1-1

1-4

1-8

1-10

1-14

1-15

1-16

1-17

1-18

1-20

1-22

DRIVE LAYOUT 1-26

ELECTRICAL COMPONENT DESCRIPTIONS

1-27

OVERALL MACHINE CONTROL

1-34

AC AND DC POWER DISTRIBUTION

1-35

SECTION 2: DETAILED SECTION DESCRIPTION

DRUM

CHARGE

ERASE

Selenium Drum

Drum Thermistor Unit

Drum Heater Circuit

Corona Unit

Corona Unit Ventilation

Wire Cleaner

Charge Power Pack

Introduction

Side Erase and leading/Trailing Edge Erase

Erase Lamp Circuit

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

EXPOSURE

Introduction

Exposure Lamp Unit

Automatic Image Density Sensing

Lamp Regulator

Optics Cooling Fan

Anticondensation Heater

SCANNER DRIVE

Introduction

Scanner Motor Control

LENS AND MIRROR POSITIONG

Lens Positioning

Second Scanner Shift

Lens/Mirror Position Initialization

DEVELOPMENT UNIT

Introduction

Drive Mechanism

Cross Mixing

Knocking Solenoid

Toner Density Control

Image Density Control

Bias for ID Sensing

Bias Circuit

Development Drive Motor

TRANSFER AND SEPARATION

CLEANIG

PTC (Pre-TransferŽCorona) and PTL

(Pre-Transfer Lamp)

Image Transfer

Paper Separation

TC/SC Wire Cleaner

Pick-off Pawls

PTC Power Pack and PTL Stabilizer

Transfer/Separation Power Pack

Introduction

Drive Mechanism

Cleaning Blade Pressure Mechanism

Used Toner Removal

Cleaning Solenoid Circuit

PCC Power Pack

Cleaning Bias Power Pack

QUENCHING

Introduction

Pre-Quenching corona Circuit

Quenching Lamp Circuit

2-11

2-12

2-13

2-14

2-16

2-17

2-18

2-20

2-22

2-23

2-24

2-26

2-27

2-28

2-29

2-33

2-37

2-38

2-40

2-42

2-43

2-44

2-45

2-46

2-47

2-49

2-50

2-51

2-53

2-55

2-56

2-57

2-58

2-59

2-60

PAPER FEED

Introduction

Feed Unit Mechanism

FER Operation

Paper Tray Drive Mechanism

Friction Roller Reverse Mechanism

Paper Volume Detection

Guide Posts and Paper Size Detection

Tray Lock and Positioning

Paper Size Board

10.

220/240-Volt Paper Size Sensor

11.

Tray Motor Circuit

12.

Paper Tray Heaters

13.

Tray Set Detection

VERTICAL TRANSPORT AND REGISTRATION

Introduction

Drive Mechanism

Jam Check Timing

PAPER TRANSPORT

Introduction

Vacuum Fan

FUSING

Introduction

INVERTER

Circuit

Pressure Mechanism

Oil Supply

Oil End Sensor

Drive Mechanism

Fusing Lamp Circuit

Introduction

Operation

Inverter Rollers

Inversion

Junction Gate

DUPLEX TRAY

Introduction

Drive Mechanism

Fork Gate

Paper Positioning

Bottom Plate Mechanism

Duplex Paper Feed

Duplex Motor Circuit

TOP UNIT

Release Mechanism

Drum Support

2-61

2-62

2-63

2-64

2-65

2-66

2-67

2-68

2-69

2-70

2-71

2-72

2-73

2-74

2-76

2-78

2-79

2-80

2-81

2-82

2-83

2-84

2-85

2-86

2-88

2-89

2-91

2-92

2-93

2-94

2-96

2-97

2-98

2-99

2-100

2-101

2-102

OTHER CIRCUITS

10.

Counters

Photosensor

Photointerrupters

Solenoids

Magnetic Clutches

Monitor Board

Operation Panel

AC Drive Board

Ozone Fan

Corona Cleaner

2-103

2-105

2-106

2-107

2-108

2-109

2-110

2-111

2-112

2-113

SECTION 3:

INSTALLATION

INSTALLATION REQUIREMENT

Environment

Minimum Space Requirement

Machine Level

Power Source

3-1

3-2

3-3

INSTALLATION

Unpacking

Accessory Check

Installation Procedure

3-4

3-5

3-6

KEY COUNTER HOLDER INSTALLATION

3-15

A3/11” x 17” COUNTER INSTALLATION

3-16

MODIFYING MAIN TRANSFORMER VOLTAGE (220V to 240V)

3-17

PREPARATION FOR TRANSPORTING THE COPIER

3-18

SECTION 4:

SERVICE TABLES

PM TABLE

4-1

LUBRICATION PARTS

4-8

SERVICE TABLES

Test Points

Variable Resistors

Dip Switches

4-11

4-12

SERVICE REMARKS

4-13

SPECIAL TOOLS AND LUBRICANTS

4-18

SECTION 5: REPLACEMENT AND ADJUSTMENT

EXTERIOR COMPOMENT REMOVAL

Exposure Glass and Operation Panel Removal

5-1

Top Plate Removal

5-2

DRUM AND CHARGE

Drum Replacement

Drum Thermoswitch and Heater Replacement

Charge Corona Wire and

Cleaner Pad Replacement

EXPOSURE

Scanner Drive Wire Replacement

Lens Drive Wire Replacement

Exposure Lamp Unit Removal

DEVELOPMENT

Development Unit Removal

Developer Replacement

Development Roller and

Paddle Roller Removal

Adjustment of Development Roller Gaps

Image Density Sensor Cleaning and Removal

Image Density Sensor Adjustment

TRANSFER AND PICK-OFF

CLEANING

FUSING

Transport Unit Removal

Transfer Ozone Filter Replacement

Pre-transfer Corona Wire Replacement

Transfer/Separation Corona Wire

and Cleaner Pad Replacement

Transport Belt Replacement

Registration Sensor Replacement

Pick-off Pawl Unit Removal

Cleaning Blade and Brush Replacement

Pre-cleaning Corona Wire Replacement

Toner Collection Coil Replacement

Cleaning Blade pressure Adjustment

Blade Cleaner and Bias Roller Blade Replacement

Pre-quenching Corona Wire Replacement

Fusing Unit Removal

Hot Roller Stripper Replacement

Cleaning Blade, Metering Blade,

and Oil Supply Pad Replacement

Hot Roller Replacement

Pressure Roller Replacement

Thermistor and Thermofuse Replacement

Fusing Pressure Adjustment

Hot Roller Temperature Adjustment

5-3

5-4

5-5

5-6

5-16

5-20

5-21

5-22

5-23

5-25

5-27

5-28

5-29

5-30

5-31

5-32

5-33

5-34

5-35

5-36

5-37

5-38

5-39

5-40

5-41

5-42

5-43

5-44

5-46

5-48

5-49

5-50

5-52

INVERTER

Inverter Roller Clutch Disassembly

and Adjustment

Return Pinch Roller Solenoid Adjustment

Inverter Gate Solenoid Adjustment

PAPER FEED

Paper Feed Unit Removal

Pick-up Roller Replacement

Feed Roller Replacement

Friction Roller Replacement

Paper Tray Unit and Cover Removal

Paper Tray Drive Wire Replacement

Vertical Transport Unit Removal

DUPLEX TRAY

Duplex Tray Removal

Paper Feed Roller Replacement and Adjustment

Pick-up Roller Replacement

Friction Roller Replacement

Bottom Plate Pressure Clutch Disassembly

Duplex Paper Sensor Adjustment

Duplex Side Plate Drive Wire Replacement

COPY IMAGE

Horizontal Magnification Adjustment

Side-to-Side Registration Adjustment

Uneven Exposure Adjustment

Light Intensity Adjustment

Auto Density Sensor Adjustment

CORONA CURRENT ADJUSTMENT

Corona Current Adjustment Preparation

Charge Corona

Pre-transfer Corona

Transfer Corona

Separation Corona

Pre-cleaning Corona

Pre-quenching Corona

SERVICE PROGRAM MODE

Factory Settings

How to access SP41 to SP53

Service Program Functions

5-53

5-55

5-56

5-57

5-58

5-59

5-60

5-61

5-62

5-65

5-66

5-67

5-68

5-69

5-70

5-71

5-72

5-73

5-74

5-75

5-76

5-77

5-78

5-80

5-81

5-82

5-83

5-84

5-85

5-86

5-87

5-88

SECTION 6: ELECTRICAL DATA

MAIN BAORD SCHEMATIC 1

6-1

MAIN BAORD SCHEMATIC 2

6-2

MAIN BAORD SCHEMATIC 3

6-3

DC DRIVE BOARD SCHEMATIC

6-4

SCANNER MOTOR CONTROL BOARD SCHEMATIC

6-5

MAIN MOTOR CONTROL BOARD SCHEMATIC

6-6

LENS/MIRROR MOTOR CONTROL BOARD SCHEMATIC

6-6

POWER SUPPLY UNIT BLOCK DIAGRAM

6-7

AC DRIVE BOARD SCHEMATIC

6-9

OPERATION PANEL-CPU BOARD SCHEMATIC

6-10

SECTION 7: DOCUMENT FEEDER

SPECIFICATIONS

7-1

MECHANICAL COMPONENT LAYOUT

ELECTRICAL COMPONENT LAYOUT

ELECTRICAL COMPONENT DESCRIPTIONS

BASIC OPERATION

Single-Sided Original Feed

Two-Sided Original Feed

Computer From Feed

FEED-IN UNIT

Original Feed-in

Drive Mechanism

Pressure Mylar Release

Separation of Originals

Relay Roller Pressure Release

TRANSPORT AND INVERSION UNIT

Original Transport

Transport Belt Drive Mechanism

Original Inversion and Feed-out

Inversion and Feed-out Drive Mechanism

Lift Mechanism

7-2

7-3

7-4

7-5

7-7

7-9

7-10

7-12

7-14

7-15

7-16

7-17

7-18

7-19

7-20

7-22

COMPUTER FORM FEED

7-23

ELECTRICAL OPERATION

SERVICE

Interface With Copier

Feed-in Sensor

Motor Control

Original Size Sensing

DF Misfeed Check

Application Switch

Form Size Switch

CFF Feed Hole and Set Sensors

TABLES

Test Point Table

Variable Resistor Table

LED Table

DIP Switch Table

Blown Fuse Table

Switch Failure Table

Sensor Failure Table

REPLACEMENT AND ADJUSTMENT

Separation Roller Replacement

Friction Tab Replacement

Pick-up Roller Replacement

Transport Unit Cover Removal

Feed Belt Removal

Inverter Entrance and Inverter

Sensor Replacement

Turn Roller Replacement

7-24

7-25

7-26

7-27

7-29

7-30

7-31

7-32

7-33

7-34

7-35

7-36

7-37

7-38

7-39

7-40

7-43

7-44

Registration

7-45

7-46

Exit Roller/Pull-out Roller Replacement

7-47

Inverter Roller Replacement

7-48

10.

DF Removal

7-50

11.

Original Skew Adjustment

7-51

12.

Original Leading Edge Adjustment

7-52

13.

Registration Sensor

Threshold Level Adjustment

7-53

14.

Feed-in, Belt, and Inverter Motor

7-54

Speed Adjustment

TIMING CHART 1

7-55

TIMING CHART 2

7-56

DF MAIN BAORD SCHEMATIC

7-57

SECTION 8:

LARGE CAPACITY TRAY

SPECIFICATIONS 8-1

MECHANICAL COMPONENT LAYOUT

8-2

ELECTRICAL COMPONENT LAYOUT

8-3

ELECTRICAL COMPONENT DESCRIPTIONS

8-4

MECHANICAL OPERATION

Basic Operation

8-5

Feed Unit Mechanism

8-6

Tray Drive Mechanism

8-7

Friction Roller Reverse Mechanism

8-8

Paper Volume Detection

8-8

Guide Plate and Paper Size Detection

8-9

Tray Lock and Positioning

8-10

ELECTRICAL OPERATION

Tray Motor Circuit

8-11

Paper Tray Heater

8-12

Tray Set Detection

8-12

INSTALLATION

Accessory Check

8-13

Installation Procedure

8-14

REPLACEMENT AND ADJUSTMENT

Paper Feed Unit Removal

8-18

Pick-up Roller Replacement

8-19

Feed Roller Replacement

8-20

Friction Roller Replacement

8-21

Paper Tray Unit Removal

8-22

Paper Tray Drive Wire Replacement

8-23

SECTION 9: SORTER

SPECIFICATIONS

9-1

MECHANICAL COMPONENT LAYOUT

9-2

ELECTRICAL COMPONENT LAYOUT

9-3

SORTER DRIVE

9-4

ELECTRICAL COMPONENT DESCRIPTIONS

9-6

MECHANICAL OPERATION

Basic Operation

9-8

Transport Belt Mechanism

9-10

Turn Gate

9-11

Misfeed Clearance Release Mechanism

9-12

Manual Feed

9-13

Bin Gate Operation

9-14

ELECTRICAL OPERATION

Interface with The Copier and AC Power

9-15

Timing Exit, and Manual Feed Sensors

9-16

Bin and Jam Sensors

9-17

Bin and Turn Gate Solenoids

9-18

Safety Switches

9-19

Distribution Drive Clutch

9-20

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