Ricoh G176 User manual

G176/G177/G176L
SERVICE MANUAL
003037MIU

G176/G177/G176L
SERVICE MANUAL

G176/G177/G176L
SERVICE MANUAL
003037MIU

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interest of Ricoh Corporation and its member companies.
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any trade name, or web site is intended to convey endorsement or other
affiliation with Ricoh products.
©2007 RICOH Corporation. All rights reserved.

The Service Manual contains information
regarding service techniques, procedures,
processes and spare parts of office equipment
distributed by Ricoh Corporation. Users of this
manual should be either service trained or
certified by successfully completing a Ricoh
Technical Training Program.
Untrained and uncertified users utilizing
information contained in this service manual to
repair or modify Ricoh equipment risk personal
injury, damage to property or loss of warranty
protection.
Ricoh Corporation
WARNING

LEGEND
PRODUCT CODE COMPANY
GESTETNER LANIER RICOH SAVIN
G176 P7031n LP131n SP 4100N MLP31n
G177 P7035n LP136n SP 4110N MLP36n
G176L P7031nL LP131nL Aficio SP 4100NL MLP31nL
DOCUMENTATION HISTORY
REV. NO. DATE COMMENTS
* 03/2007 Original Printing
1 5/2008 G176L Addition

SM i G176/G177/G176L
G176/G177/G176L
TABLE OF CONTENTS
INSTALLATION
1. INSTALLATION .......................................................................1-1
1.1 INSTALLATION REQUIREMENTS.......................................................1-1
1.1.1 ENVIRONMENT ..........................................................................1-1
1.1.2 MACHINE LEVEL ........................................................................1-2
1.1.3 REQUIRED SPACE.....................................................................1-2
1.1.4 POWER SUPPLY ........................................................................1-2
1.2 MACHINE INSTALLATION ...................................................................1-3
1.3 DATA OVERWRITE SECURITY UNIT INSTALLATION .......................1-4
1.3.1 INSTALLATION ...........................................................................1-4
1.3.2 CHECKING AND COMPLETING THE INSTALLATION ..............1-5
PREVENTIVE MAINTENANCE
2. PREVENTIVE MAINTENANCE ...............................................2-1
2.1 USER MAINTENANCE .........................................................................2-1
2.2 SERVICE MAINTENANCE ...................................................................2-2
REPLACEMENT AND ADJUSTMENT
3. REPLACEMENT AND ADJUSTMENT ....................................3-1
3.1 GENERAL.............................................................................................3-1
3.1.1 PRECAUTIONS ON DISASSEMBLY ..........................................3-1
3.1.2 RELEASING PLASTIC LATCHES ...............................................3-2
3.1.3 AFTER SERVICING THE MACHINE...........................................3-3
3.2 SPECIAL TOOLS..................................................................................3-4
3.3 COVERS...............................................................................................3-5
3.3.1 FRONT COVER...........................................................................3-5
3.3.2 UPPER COVER...........................................................................3-5

G176/G177/G176L ii SM
3.3.3 BY-PASS TRAY UNIT .................................................................3-6
3.3.4 EXTERIOR COVERS ..................................................................3-6
3.4 LASER UNIT .........................................................................................3-7
3.4.1 CAUTION DECAL LOCATIONS ..................................................3-7
3.4.2 POLYGON MIRROR MOTOR .....................................................3-7
3.4.3 LASER SYNCHRONIZATION DETECTOR .................................3-8
3.4.4 LASER UNIT................................................................................3-9
3.4.5 LASER DIODE UNIT .................................................................3-10
3.4.6 LASER BEAM PITCH ADJUSTMENT .......................................3-10
3.5 TRANSFER ROLLER .........................................................................3-13
3.6 TONER END SENSOR.......................................................................3-14
3.7 FUSING ..............................................................................................3-15
3.7.1 FUSING UNIT ............................................................................3-15
3.7.2 HOT ROLLER AND FUSING LAMP ..........................................3-16
3.7.3 PRESSURE ROLLER................................................................3-18
3.7.4 THERMISTOR AND THERMOSTAT .........................................3-18
3.7.5 HOT ROLLER STRIPPERS.......................................................3-19
3.8 PAPER FEED .....................................................................................3-20
3.8.1 PAPER FEED ROLLER.............................................................3-20
3.8.2 FRICTION PAD..........................................................................3-21
3.9 BY-PASS TRAY ..................................................................................3-22
3.10 PRINTER CONTROLLER BOARD ...................................................3-23
3.11 ENGINE BOARD...............................................................................3-24
3.12 MAIN MOTOR...................................................................................3-25
3.13 CLUTCHES.......................................................................................3-26
3.14 PSU, HVPS.......................................................................................3-27
3.15 COOLING FAN .................................................................................3-28
TROUBLESHOOTING
4. TROUBLESHOOTING .............................................................4-1
4.1 SERVICE CALL CONDITIONS .............................................................4-1
4.1.1 SUMMARY...................................................................................4-1
4.1.2 SC CODE DESCRIPTIONS.........................................................4-2
4.2 ERROR MESSAGES ..........................................................................4-18
4.3 GENERAL TROUBLESHOOTING ......................................................4-25

SM iii G176/G177/G176L
4.3.1 IMAGE ADJUSTMENT ..............................................................4-25
Registration Adjustment ................................................................4-25
Parallelogram Image Adjustment ..................................................4-25
4.3.2 ELECTRICAL DEFECTS ...........................................................4-26
Fuses ............................................................................................4-28
4.3.3 SKEW ADJUSTMENT ...............................................................4-29
4.3.4 STREAKS IN THE SUB SCAN DIRECTION..............................4-29
4.3.5 MISCELLANEOUS PROBLEMS................................................4-30
SERVICE TABLES
5. SERVICE TABLES...................................................................5-1
5.1 SERVICE PROGRAM MODE ...............................................................5-1
5.1.1 SERVICE PROGRAM MODE: OVERVIEW.................................5-1
Entering the Service Mode ..............................................................5-1
Setting a Service Program...............................................................5-2
Exiting Service Mode.......................................................................5-2
5.2 PRINTER CONTROLLER SERVICE MODE ........................................5-3
5.2.1 SERVICE MODE MENU ("1. SERVICE MENU").........................5-3
5.2.2 BIT SWITCH PROGRAMMING ...................................................5-3
5.3 PRINTER ENGINE SERVICE MODE ...................................................5-4
5.3.1 SERVICE MODE TABLE .............................................................5-4
SP1-xxx: Feed.................................................................................5-4
SP2-xxx: Drum ..............................................................................5-10
SP3-xxx: Process ..........................................................................5-12
SP5-xxx: Mode ..............................................................................5-14
SP7-xxx: Data Log ........................................................................5-56
SP8XXX: Data Log 2.....................................................................5-71
5.4 FIRMWARE UPDATE .........................................................................5-82
5.4.1 TYPE OF FIRMWARE ...............................................................5-82
5.4.2 PRECAUTIONS .........................................................................5-82
Handling SD Cards........................................................................5-82
Upload/Download ..........................................................................5-83
Network Connection ......................................................................5-83
5.4.3 MACHINE FIRMWARE UPDATE ..............................................5-83
5.5 NVRAM DATA UPLOAD/DOWNLOAD...............................................5-85

G176/G177/G176L iv SM
5.5.1 UPLOADING NVRAM DATA .....................................................5-85
5.5.2 DOWNLOADING NVRAM DATA ...............................................5-86
5.6 SD CARD APPLICATION MOVE........................................................5-88
5.6.1 OVERVIEW................................................................................5-88
5.6.2 MOVE EXEC..............................................................................5-88
5.6.3 UNDO EXEC..............................................................................5-89
5.7 CONTROLLER SELF TEST AT POWER-ON.....................................5-91
5.8 MENU MODE......................................................................................5-92
5.9 CONTROLLER BOARD DIP SWITCHES ...........................................5-98
DETAILED DESCRIPTIONS
6. DETAILS ..................................................................................6-1
6.1 OVERVIEW...........................................................................................6-1
6.1.1 MECHANICAL COMPONENT LAYOUT ......................................6-1
6.1.2 PAPER PATH ..............................................................................6-2
6.2 BOARD STRUCTURE ..........................................................................6-3
6.2.1 BLOCK DIAGRAM .......................................................................6-3
6.2.2 CONTROLLER BOARD...............................................................6-4
6.3 PRINTING PROCESS ..........................................................................6-6
6.3.1 OVERVIEW..................................................................................6-6
6.3.2 LASER EXPOSURE ....................................................................6-7
Overview .........................................................................................6-7
Automatic Power Control (APC) ......................................................6-8
LD Safety Mechanisms ...................................................................6-9
6.3.3 CARTRIDGE OVERVIEW..........................................................6-10
6.3.4 DRUM CHARGE........................................................................6-10
6.3.5 DEVELOPMENT........................................................................6-11
Toner Supply and Development ....................................................6-11
Toner Density Control ...................................................................6-12
6.3.6 TONER END DETECTION ........................................................6-13
Overview .......................................................................................6-13
Toner End Sensor .........................................................................6-13
Main Motor Rotation Count............................................................6-14
Toner Overflow Prevention............................................................6-14
Summary.......................................................................................6-15

SM v G176/G177/G176L
6.4 PAPER FEED .....................................................................................6-18
6.4.1 OVERVIEW................................................................................6-18
6.4.2 PAPER TRAY ............................................................................6-20
Tray Extension ..............................................................................6-20
Paper Lift.......................................................................................6-21
Paper Feed and Registration.........................................................6-21
Paper Size Detection.....................................................................6-22
Paper End Detection .....................................................................6-23
Remaining Paper Detection...........................................................6-23
6.4.3 BY-PASS TRAY.........................................................................6-24
6.5 IMAGE FUSING AND PAPER EXIT ...................................................6-25
6.5.1 OVERVIEW................................................................................6-25
6.5.2 FUSING DRIVE .........................................................................6-26
6.5.3 FUSING ENTRANCE AND GUIDE SHAFT ...............................6-26
6.5.4 PRESSURE ROLLER................................................................6-27
6.5.5 NEW FUSING UNIT DETECTION .............................................6-28
6.5.6 FUSING TEMPERATURE CONTROL.......................................6-29
Overheat Protection ......................................................................6-30
6.5.7 PAPER EXIT..............................................................................6-31
6.5.8 ENERGY SAVER MODE ...........................................................6-32
6.6 CONTROLLER FUNCTIONS..............................................................6-33
SPECIFICATIONS
7. SPECIFICATIONS....................................................................7-1
7.1 BASIC SPECIFICATIONS ....................................................................7-1
7.1.1 GENERAL SPECIFICATIONS .....................................................7-1
7.1.2 EXTERNAL OPTIONS.................................................................7-4
7.1.3 PAPER SIZES .............................................................................7-5
Plain Paper......................................................................................7-5
Envelope .........................................................................................7-6
Custom............................................................................................7-6
Envelopes........................................................................................7-7
7.1.4 OPERATING ENVIRONMENT ....................................................7-8
7.1.5 OPERATION PANEL LED SPECIFICATIONS ..........................7-10
7.2 CONTROLLER SPECIFICATIONS.....................................................7-11

G176/G177/G176L vi SM
7.2.1 CONTROLLER BOARD.............................................................7-11
7.2.2 PRINTING FUNCTIONS............................................................7-12
7.2.3 PRINTER DRIVERS ..................................................................7-13
7.2.4 SUPPORTED ENVIRONMENTS...............................................7-16
Windows Environments.................................................................7-16
Notes.............................................................................................7-17
Mac OS Environments ..................................................................7-17
Notes.............................................................................................7-17
UNIX Environment.........................................................................7-18
Novell Netware ..............................................................................7-18
SAP R/3 Environment ...................................................................7-19
7.2.5 CONTROLLER INTERFACE SPECIFICATIONS ......................7-20
7.2.6 SUPPORTED UTILITIES...........................................................7-22
Bundled Utilities.............................................................................7-22
Optional Utilities ............................................................................7-22
7.3 MACHINE CONFIGURATION ............................................................7-23
7.3.1 SYSTEM COMPONENTS..........................................................7-23
G893 DUPLEX UNIT AD1000
SEE SECTION G893 FOR DETAILED TABLE OF CONTENTS
G894 PAPER FEED UNIT TK1030 &
G362 ENVELOPE FEEDER TYPE 400
SEE SECTION G894/G362 FOR DETAILED TABLE OF CONTENTS

INSTALLATION
PREVENTIVE MAINTENANCE
G894 PAPER FEED UNIT TK1030/G362 ENVELOPE
FEEDER TYPE 400
REPLACEMENT AND ADJUSTMENT
TROUBLESHOOTING
SERVICE TABLES
G893 DUPLEX UNIT AD1000
DETAILED DESCRIPTIONS
SPECIFICATIONS
TAB
POSITION 2
TAB
POSITION 1
TAB
POSITION 3
TAB
POSITION 4
TAB
POSITION 6
TAB
POSITION 5
TAB
POSITION 8
TAB
POSITION 7