Ricoh FT7770 User manual

RICOH FT7770
SERVICE MANUAL
RICOH COMPANY, LTD.

TABLE OF CONTENTS
SECTION 1:
OVERALL MACHINE INFORMATION
MAIN SPECIFICATIONS
GUIDE TO COMPONENTS
1. Copier Exterior
2.
Copier Interior
3. 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
1.
2.
3.
CHARGE
1.
2.
3.
4.
ERASE
1.
2.
3.
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
1.
2.
3.
4.
5.
6.
Introduction
Exposure Lamp Unit
Automatic Image Density Sensing
Lamp Regulator
Optics Cooling Fan
Anticondensation Heater
SCANNER DRIVE
1. Introduction
2. Scanner Motor Control
LENS AND MIRROR POSITIONG
1. Lens Positioning
2. Second Scanner Shift
3.
Lens/Mirror Position Initialization
DEVELOPMENT UNIT
1. Introduction
2. Drive Mechanism
3.
Cross Mixing
4.
Knocking Solenoid
5. Toner Density Control
6. Image Density Control
7.
Bias for ID Sensing
8. Bias Circuit
9. Development Drive Motor
TRANSFER AND SEPARATION
1.
2.
3.
4.
5.
6.
7.
CLEANIG
1.
2.
3.
4.
5.
6.
7.
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
1.
Introduction
2. Pre-Quenching corona Circuit
3. Quenching Lamp Circuit
2-11
2-12
2-13
2-14
2-16
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
2-42
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
1. Introduction
2.
Feed Unit Mechanism
3.
FER Operation
4.
Paper Tray Drive Mechanism
5.
Friction Roller Reverse Mechanism
6.
Paper Volume Detection
7. Guide Posts and Paper Size Detection
8. Tray Lock and Positioning
9. 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
1.
Introduction
2.
Drive Mechanism
3.
Jam Check Timing
PAPER TRANSPORT
1.
Introduction
2.
Vacuum Fan
FUSING
1.
Introduction
2.
3.
4.
5.
6.
INVERTER
1.
2.
3.
4.
5.
Circuit
Pressure Mechanism
Oil Supply
Oil End Sensor
Drive Mechanism
Fusing Lamp Circuit
Introduction
Operation
Inverter Rollers
Inversion
Junction Gate
DUPLEX TRAY
1.
Introduction
2.
Drive Mechanism
3. Fork Gate
4.
Paper Positioning
5.
Bottom Plate Mechanism
6. Duplex Paper Feed
7. Duplex Motor Circuit
TOP UNIT
1.
Release Mechanism
2. 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
2-96
2-97
2-98
2-99
2-100
2-101
2-102

OTHER CIRCUITS
1.
2.
3.
4.
5.
6.
7.
8.
9.
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
1. Environment
2. Minimum Space Requirement
3. Machine Level
4. Power Source
3-1
3-2
3-3
3-3
INSTALLATION
1. Unpacking
2.
Accessory Check
3. 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
1. Test Points
2.
Variable Resistors
3. Dip Switches
4-11
4-11
4-12
4-12
SERVICE REMARKS 4-13
SPECIAL TOOLS AND LUBRICANTS
4-18
SECTION 5: REPLACEMENT AND ADJUSTMENT
EXTERIOR COMPOMENT REMOVAL
1. Exposure Glass and Operation Panel Removal
5-1
2.
Top Plate Removal
5-2

DRUM AND CHARGE
1. Drum Replacement
2. Drum Thermoswitch and Heater Replacement
3. Charge Corona Wire and
Cleaner Pad Replacement
EXPOSURE
1. Scanner Drive Wire Replacement
2. Lens Drive Wire Replacement
3. Exposure Lamp Unit Removal
DEVELOPMENT
1. Development Unit Removal
2.
Developer Replacement
3. Development Roller and
Paddle Roller Removal
4. Adjustment of Development Roller Gaps
5.
Image Density Sensor Cleaning and Removal
6. Image Density Sensor Adjustment
TRANSFER AND PICK-OFF
1.
2.
3.
4.
5.
6.
7.
CLEANING
1.
2.
3.
4.
5.
6.
FUSING
1.
2.
3.
4.
5.
6.
7.
8.
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
1.
Inverter Roller Clutch Disassembly
and Adjustment
2. Return Pinch Roller Solenoid Adjustment
3.
Inverter Gate Solenoid Adjustment
PAPER FEED
1.
Paper Feed Unit Removal
2. Pick-up Roller Replacement
3. Feed Roller Replacement
4. Friction Roller Replacement
5. Paper Tray Unit and Cover Removal
6. Paper Tray Drive Wire Replacement
7.
Vertical Transport Unit Removal
DUPLEX TRAY
1. Duplex Tray Removal
2. Paper Feed Roller Replacement and Adjustment
3.
Pick-up Roller Replacement
4. Friction Roller Replacement
5. Bottom Plate Pressure Clutch Disassembly
6.
Duplex Paper Sensor Adjustment
7. Duplex Side Plate Drive Wire Replacement
COPY IMAGE
1. Horizontal Magnification Adjustment
2. Side-to-Side Registration Adjustment
3. Uneven Exposure Adjustment
4. Light Intensity Adjustment
5. Auto Density Sensor Adjustment
CORONA CURRENT ADJUSTMENT
1. Corona Current Adjustment Preparation
2. Charge Corona
3. Pre-transfer Corona
4. Transfer Corona
5. Separation Corona
6. Pre-cleaning Corona
7.
Pre-quenching Corona
SERVICE PROGRAM MODE
1. Factory Settings
2. How to access SP41 to SP53
3. 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
1. Single-Sided Original Feed
2. Two-Sided Original Feed
3. Computer From Feed
FEED-IN UNIT
1. Original Feed-in
2. Drive Mechanism
3. Pressure Mylar Release
4. Separation of Originals
5. Relay Roller Pressure Release
TRANSPORT AND INVERSION UNIT
1. Original Transport
2. Transport Belt Drive Mechanism
3. Original Inversion and Feed-out
4.
Inversion and Feed-out Drive Mechanism
5. 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
1.
2.
3.
4.
5.
6.
7.
8.
SERVICE
1.
2.
3.
4.
5.
6.
7.
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
1. Separation Roller Replacement
2. Friction Tab Replacement
3. Pick-up Roller Replacement
4. Transport Unit Cover Removal
5. Feed Belt Removal
6. Inverter Entrance and Inverter
Sensor Replacement
7.
Turn Roller Replacement
7-24
7-25
7-26
7-27
7-29
7-30
7-31
7-32
7-33
7-33
7-34
7-35
7-36
7-36
7-37
7-38
7-39
7-40
7-43
7-44
Registration
7-45
7-46
8.
Exit Roller/Pull-out Roller Replacement
7-47
9. 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
1. Basic Operation 8-5
2. Feed Unit Mechanism 8-6
3.
Tray Drive Mechanism
8-7
4. Friction Roller Reverse Mechanism 8-8
5. Paper Volume Detection 8-8
6. Guide Plate and Paper Size Detection 8-9
7.
Tray Lock and Positioning
8-10
ELECTRICAL OPERATION
1. Tray Motor Circuit 8-11
2. Paper Tray Heater 8-12
3. Tray Set Detection 8-12
INSTALLATION
1. Accessory Check
8-13
2. Installation Procedure
8-14
REPLACEMENT AND ADJUSTMENT
1. Paper Feed Unit Removal 8-18
2. Pick-up Roller Replacement
8-19
3. Feed Roller Replacement 8-20
4. Friction Roller Replacement 8-21
5. Paper Tray Unit Removal
8-22
6. 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
1. Basic Operation
9-8
2. Transport Belt Mechanism
9-10
3.
Turn Gate
9-11
4. Misfeed Clearance Release Mechanism
9-12
5. Manual Feed
9-13
6. Bin Gate Operation
9-14
ELECTRICAL OPERATION
1. Interface with The Copier and AC Power
9-15
2. Timing Exit, and Manual Feed Sensors
9-16
3. Bin and Jam Sensors 9-17
4. Bin and Turn Gate Solenoids
9-18
5. Safety Switches
9-19
6.
Distribution Drive Clutch
9-20