Ricoh M156 User manual

M156/M157/M176/M177
SERVICE MANUAL

It is the reader's responsibility when discussing the information contained
within this document to maintain a level of confidentiality that is in the best
interest of Ricoh Americas Corporation and its member companies.
NO PART OF THIS DOCUMENT MAY BE REPRODUCED IN ANY
FASHION AND DISTRIBUTED WITHOUT THE PRIOR
PERMISSION OF RICOH AMERICAS CORPORATION.
All product names, domain names or product illustrations, including
desktop images, used in this document are trademarks, registered
trademarks or the property of their respective companies.
They are used throughout this book in an informational or editorial fashion
only and for the benefit of such companies. No such use, or the use of
any trade name, or web site is intended to convey endorsement or other
affiliation with Ricoh products.
2013 RICOH Americas Corporation. All rights reserved.

The Service Manual contains information
regarding service techniques, procedures,
processes and spare parts of office equipment
distributed by Ricoh Americas 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 Americas Corporation
WARNING

LEGEND
PRODUCT
CODE COMPANY
LANIER RICOH SAVIN
M156 SP 311FN SP 311FN SP 311FN
M157 SP 311SFNw SP 311SFNw SP 311SFNw
M176 SP 310FN SP 310FN SP 310FN
M177 SP 310FNw SP 310FNw SP 310FNw
DOCUMENTATION HISTORY
REV. NO.
DATE
COMMENTS
*
09/2013
Original Printing

SM i M156/M157/M176/M177
M156/M157/M176/M177
TABLE OF CONTENTS
1. PRODUCT INFORMATION......................................................... 1-1
1.1 PRODUCT OVERVIEW............................................................................. 1-1
1.1.1 COMPONENT LAYOUT................................................................... 1-1
1.1.2 PAPER PATH................................................................................... 1-2
1.1.3 DRIVE LAYOUT ............................................................................... 1-2
1.2 MACHINE CODES AND PERIPHERALS CONFIGURATION................... 1-3
1.2.1 MAIN FRAME ................................................................................... 1-3
1.3 SPECIFICATIONS..................................................................................... 1-4
2. INSTALLATION .......................................................................... 2-1
2.1 INSTALLATION REQUIREMENTS............................................................ 2-1
2.1.1 CHECK IMAGE QUALITY / SETTINGS............................................ 2-1
Environment......................................................................................... 2-1
2.1.2 MOVING AND TRANSPORTING THE MACHINE............................ 2-1
3. PREVENTIVE MAINTENANCE................................................... 3-1
3.1 PREVENTIVE MAINTENANCE TABLES................................................... 3-1
3.2 IMAGE QUALITY STANDARDS................................................................ 3-2
3.3 PAPER TRANSFER QUALITY STANDARDS........................................... 3-3
3.4 PM PARTS SETTINGS.............................................................................. 3-4
3.4.1 PM PARTS ....................................................................................... 3-4
3.5 PREPARATION FOR PM .......................................................................... 3-5
3.5.1 YIELD COUNTER............................................................................. 3-5
Counter Reset...................................................................................... 3-5
3.6 CLEANING POINTS.................................................................................. 3-6
4. REPLACEMENT AND ADJUSTMENT........................................ 4-1
4.1 GENERAL CAUTIONS.............................................................................. 4-1
4.2 SPECIAL TOOLS....................................................................................... 4-1
4.3 EXTERIOR COVERS ................................................................................ 4-2
4.3.1 FRONT COVER................................................................................ 4-2
4.3.2 LEFT COVER................................................................................... 4-3
4.3.3 REAR COVER.................................................................................. 4-5
4.3.4 RIGHT COVER................................................................................. 4-6

M156/M157/M176/M177 ii SM
4.3.5 TOP COVER..................................................................................... 4-7
When installing the top cover............................................................... 4-7
4.4 SCANNER UNIT........................................................................................ 4-8
4.4.1 SCANNER UNIT............................................................................... 4-8
4.4.2 OPERATION PANEL........................................................................ 4-9
4.5 ADF.......................................................................................................... 4-10
4.5.1 ADF UNIT ....................................................................................... 4-10
4.5.2 ORIGINAL TRAY............................................................................ 4-10
4.5.3 ADF PICK-UP ROLLER.................................................................. 4-11
4.5.4 ADF FEED ROLLER....................................................................... 4-12
4.5.5 ADF SEPARATION PAD................................................................ 4-12
4.5.6 ADF FRONT COVER...................................................................... 4-13
4.5.7 ADF REAR COVER........................................................................ 4-14
4.5.8 ADF MOTOR.................................................................................. 4-15
4.5.9 ADF TOP COVER........................................................................... 4-16
4.5.10 DOCUMENT SENSOR ............................................................. 4-16
4.5.11 ADF FEED SENSOR ................................................................ 4-17
4.6 LASER UNIT............................................................................................ 4-18
4.6.1 CAUTION DECAL LOCATIONS..................................................... 4-18
4.6.2 LASER UNIT................................................................................... 4-19
4.6.3 POLYGON MIRROR MOTOR........................................................ 4-20
4.7 PAPER FEED.......................................................................................... 4-21
4.7.1 PAPER FEED ROLLER.................................................................. 4-21
After installing a new paper feed roller............................................... 4-21
4.7.2 FRICTION PAD .............................................................................. 4-22
When reinstalling the friction pad, do it in this order:.......................... 4-22
4.7.3 PAPER END SENSOR................................................................... 4-22
4.7.4 BY-PASS FEED ROLLER .............................................................. 4-23
4.7.5 BY-PASS FEED ROLLER FRICTION PAD.................................... 4-24
4.7.6 BY-PASS FEED SENSOR.............................................................. 4-25
4.7.7 PAPER FEED CLUTCH.................................................................. 4-25
4.7.8 RELAY CLUTCH............................................................................. 4-26
4.7.9 REGISTRATION CLUTCH ............................................................. 4-26
4.7.10 REGISTRATION ROLLER........................................................ 4-27
4.7.11 REGISTRATION SENSOR....................................................... 4-30
4.8 IMAGE TRANSFER................................................................................. 4-31
4.8.1 TRANSFER ROLLER..................................................................... 4-31
After installing a new transfer roller.................................................... 4-31
4.8.2 TONER END SENSOR................................................................... 4-32

SM iii M156/M157/M176/M177
4.8.3 QUENCHING LAMP....................................................................... 4-33
4.9 FUSING AND EXIT.................................................................................. 4-34
4.9.1 FUSING UNIT................................................................................. 4-34
Reinstallation...................................................................................... 4-35
After installing a new fusing unit......................................................... 4-36
4.9.2 THERMOSTAT............................................................................... 4-36
4.9.3 THERMISTOR................................................................................ 4-37
4.9.4 FUSING LAMP ............................................................................... 4-38
When reinstalling the fusing lamp ...................................................... 4-39
4.9.5 HOT ROLLER................................................................................. 4-39
4.9.6 PRESSURE ROLLER..................................................................... 4-41
4.9.7 HOT ROLLER STRIPPER PAWLS................................................. 4-42
4.9.8 PAPER EXIT SENSOR................................................................... 4-42
4.10 DRIVE................................................................................................ 4-43
4.10.1 MAIN MOTOR........................................................................... 4-43
4.10.2 DRIVE UNIT.............................................................................. 4-43
4.10.3 DUPLEX MOTOR...................................................................... 4-44
4.11 ELECTRICAL COMPONENTS .......................................................... 4-45
4.11.1 LAYOUT OF PC BOARDS........................................................ 4-45
4.11.2 MAIN BOARD ........................................................................... 4-46
When installing the new main board .................................................. 4-46
EEPROM............................................................................................ 4-47
4.11.3 FCU........................................................................................... 4-48
4.11.4 PSU........................................................................................... 4-48
4.11.5 HVP........................................................................................... 4-51
4.11.6 CHARGE TERMINAL CASE..................................................... 4-52
4.11.7 COOLING FAN ......................................................................... 4-53
4.11.8 SPEAKER................................................................................. 4-53
4.11.9 WIRELESS LAN BOARD (FOR M157, M177).......................... 4-54
4.12 DUPLEX............................................................................................. 4-55
4.12.1 RELAY SENSOR...................................................................... 4-55
4.12.2 INVERTER SENSOR................................................................ 4-55
4.13 IMAGE ADJUSTMENT....................................................................... 4-56
4.13.1 REGISTRATION ADJUSTMENT .............................................. 4-56
User Adjustment................................................................................. 4-56
Service Adjustment............................................................................ 4-56
5. SERVICE TABLES...................................................................... 5-1
5.1 SERVICE PROGRAM MODE.................................................................... 5-1
5.1.1 OVERVIEW ...................................................................................... 5-1

M156/M157/M176/M177 iv SM
5.1.2 MAINTENANCE MODE MENU ........................................................ 5-1
Selecting an Item ................................................................................. 5-1
Going into the Next Level/ Returning to the Previous Level................. 5-1
Exiting the Maintenance Mode Menu................................................... 5-1
Menu List.............................................................................................. 5-1
5.1.3 FAX SERVICE TEST MENU .......................................................... 5-16
Entering the Fax Service Test Menu.................................................. 5-16
Selecting an Item ............................................................................... 5-16
Going into the Next Level/ Returning to the Previous Level............... 5-16
Exiting the Maintenance Mode Menu................................................. 5-16
Menu List............................................................................................ 5-16
5.2 REPORTS................................................................................................ 5-18
5.2.1 CONFIGURATION PAGE............................................................... 5-18
To Print the Configuration Page......................................................... 5-18
Total Counter ..................................................................................... 5-19
5.2.2 OTHER TYPES OF REPORTS ...................................................... 5-20
5.2.3 TEST PAGE.................................................................................... 5-20
To Print the Test Page ....................................................................... 5-20
5.2.4 TEST PATTERN PRINTING........................................................... 5-21
To Print the Test Pattern.................................................................... 5-21
5.3 UPDATING THE FIRMWARE.................................................................. 5-22
5.3.1 CHECKING THE MACHINE FIRMWARE VERSION...................... 5-22
5.3.2 UPDATING THE MAIN FIRMWARE............................................... 5-22
Procedure........................................................................................... 5-22
5.3.3 UPDATING THE BOOT LOADER FIRMWARE.............................. 5-23
5.3.4 UPDATING FAILURE..................................................................... 5-24
5.3.5 FW UPDATE TOOL MESSAGES................................................... 5-24
FW Update Tool Messages: Information............................................ 5-24
FW Update Tool Messages: Error...................................................... 5-26
6. TROUBLESHOOTING ................................................................ 6-1
6.1 SELF-DIAGNOSTIC MODE....................................................................... 6-1
6.1.1 SELF-DIAGNOSTIC MODE AT POWER ON ................................... 6-1
6.2 SERVICE CALL......................................................................................... 6-2
6.2.1 SUMMARY ....................................................................................... 6-2
Fusing related SCs............................................................................... 6-2
6.2.2 ENGINE SC...................................................................................... 6-2
SC 2xx (Laser Optics Error)................................................................. 6-2
SC 4xx (Image Transfer and Transfer Error)........................................ 6-4
SC 5xx (Motor and Fusing Error) ......................................................... 6-4

SM v M156/M157/M176/M177
SC 6xx (Communication and Other Error)............................................ 6-7
6.2.3 CONTROLLER SC ........................................................................... 6-8
SC 8xx.................................................................................................. 6-8
6.3 JAM DETECTION...................................................................................... 6-9
6.3.1 JAM SENSOR LAYOUT................................................................... 6-9
Paper Jam............................................................................................ 6-9
Original Jam (ADF) .............................................................................. 6-9
6.3.2 JAM MESSAGE LIST ..................................................................... 6-10
Paper Jam.......................................................................................... 6-10
Original Jam....................................................................................... 6-11
6.4 IMAGE QUALITY..................................................................................... 6-12
6.4.1 OVERVIEW .................................................................................... 6-12
6.5 OTHER PROBLEMS ............................................................................... 6-13
6.5.1 DARK LINES IN HALFTONE AREAS AT 75MM INTERVALS ....... 6-13
6.6 TROUBLESHOOTING............................................................................. 6-14
6.6.1 JAM/PAPER FEED PROBLEM ...................................................... 6-14
6.6.2 IMAGE QUALITY PROBLEM ......................................................... 6-16
6.6.3 FAX PROBLEM.............................................................................. 6-17
FAX error code................................................................................... 6-18
6.6.4 OTHER PROBLEM......................................................................... 6-19
7. ENERGY SAVE........................................................................... 7-1
7.1 ENERGY SAVE......................................................................................... 7-1
7.1.1 ENERGY SAVER MODES ............................................................... 7-1
Timer Settings...................................................................................... 7-1
Return to Stand-by Mode..................................................................... 7-2
Recommendation................................................................................. 7-2
7.2 PAPER SAVE............................................................................................ 7-3
7.2.1 EFFECTIVENESS OF DUPLEX/COMBINE FUNCTION.................. 7-3
1. Duplex:............................................................................................. 7-3
2. Combine mode:................................................................................ 7-3
3. Duplex + Combine:........................................................................... 7-4
Total counter........................................................................................ 7-4

READ THIS FIRST
Safety Notices
Important Safety Notices
Prevention of Physical Injury
1. Before disassembling or assembling parts of the machine and peripherals, make sure that the
machine power cord is unplugged.
2. The wall outlet should be near the machine and easily accessible.
3. If any adjustment or operation check has to be made with exterior covers off or open while the
main switch is turned on, keep hands away from electrified or mechanically driven
components.
4. The machine drives some of its components when it completes the warm-up period. Be
careful to keep hands away from the mechanical and electrical components as the machine
starts operation.
5. The inside and the metal parts of the fusing unit become extremely hot while the machine is
operating. Be careful to avoid touching those components with your bare hands.
Health Safety Conditions
Toner is non-toxic, but if you get either of them in your eyes by accident, it may cause temporary
eye discomfort. Try to remove with eye drops or flush with water as first aid. If unsuccessful, get
medical attention.
Observance of Electrical Safety Standards
The machine and its peripherals must be serviced by a customer service representative who has
completed the training course on those models.
Safety and Ecological Notes for Disposal
1. Do not incinerate toner bottles or used toner. Toner dust may ignite suddenly when exposed
to an open flame.
2. Dispose of used toner, the maintenance unit which includes developer or the organic
photoconductor in accordance with local regulations. (These are non-toxic supplies.)
3. Dispose of replaced parts in accordance with local regulations.

To prevent a fire or explosion, keep the machine away from flammable liquids, gases,
and aerosols.A fire or an explosion might occur.
The Controller board on the MF model contains a lithium battery. The danger of explosion
exists if a battery of this type is incorrectly replaced. Replace only with the same or an
equivalent type recommended by the manufacturer. Discard batteries in accordance with
the manufacturer's instructions and local regulations.
Handling Toner
Work carefully when removing paper jams or replacing toner bottles or cartridges to avoid
spilling toner on clothing or the hands.
If toner is inhaled, immediately gargle with large amounts of cold water and move to a well
ventilated location. If there are signs of irritation or other problems, seek medical attention.
If toner gets on the skin, wash immediately with soap and cold running water.
If toner gets into the eyes, flush the eyes with cold running water or eye wash. If there are
signs of irritation or other problems, seek medical attention.
If toner is swallowed, drink a large amount of cold water to dilute the ingested toner. If there
are signs of any problem, seek medical attention.
If toner spills on clothing, wash the affected area immediately with soap and cold water. Never
use hot water! Hot water can cause toner to set and permanently stain fabric.
Always store toner and developer supplies such as toner and developer packages, cartridges,
and bottles (including used toner and empty bottles and cartridges) out of the reach of
children.
Always store fresh toner supplies or empty bottles or cartridges in a cool, dry location that is
not exposed to direct sunlight.
Do not use the cleaner to suck spilled toner (including used toner). Sucked toner may
cause firing or explosion due to electrical contact flickering inside the cleaner. However, it
is possible to use the cleaner designed for dust explosion-proof purpose. If toner is
spilled over the floor, sweep up spilled toner slowly and clean remainder with wet cloth.

Laser Safety
The Center for Devices and Radiological Health (CDRH) prohibits the repair of laser-based optical
units in the field. The optical housing unit can only be repaired in a factory or at a location with the
requisite equipment. The laser subsystem is replaceable in the field by a qualified Customer
Engineer. The laser chassis is not repairable in the field. Customer engineers are therefore
directed to return all chassis and laser subsystems to the factory or service depot when
replacement of the optical subsystem is required.
Use of controls, or adjustment, or performance of procedures other than those specified
in this manual may result in hazardous radiation exposure.
Turn off the main switch before attempting any of the procedures in the Laser Optics
Housing Unit section. Laser beams can seriously damage your eyes.
CAUTION MARKING:
Symbols, Abbreviations and Trademarks
This manual uses several symbols and abbreviations. The meaning of those symbols and
abbreviations are as follows:
Clip ring
Screw
Connector
Clamp
E-ring
SEF Short Edge Feed
LEF Long Edge Feed

Trademarks
Microsoft®, Windows®, and MS-DOS®are registered trademarks of Microsoft Corporation in the
United States and /or other countries.
PostScript®is a registered trademark ofAdobe Systems, Incorporated.
PCL®is a registered trademark of Hewlett-Packard Company.
Ethernet®is a registered trademark of Xerox Corporation.
PowerPC®is a registered trademark of International Business Machines Corporation.
Other product names used herein are for identification purposes only and may be trademarks of
their respective companies. We disclaim any and all rights involved with those marks.

PRODUCT INFORMATION
REVISION HISTORY
Page Date Added/Updated/New
None

Product Overview
SM 1-1 M156/M157/M176/M177
Product
Information
1. PRODUCT INFORMATION
1.1 PRODUCT OVERVIEW
1.1.1 COMPONENT LAYOUT
1. Laser unit 9. Friction pad
2. Quenching lamp 10. Transfer roller
3. Cartridge (AIO-type) 11. Paper Tray
4. Development roller 12. Fusing Unit
5. Registration roller 13. Pressure Roller
6. By-pass feed roller 14. Paper exit roller
7. By-pass feed tray 15. Hot Roller
8. Paper feed roller 16. Drum

Product Overview
M156/M157/M176/M177 1-2 SM
1.1.2 PAPER PATH
[A] Duplex section
[B] Standard paper tray unit
1.1.3 DRIVE LAYOUT
1. Duplex Motor 4. Relay Clutch
2. Main Motor 5. Paper Feed Clutch
3. Registration Clutch

Machine Codes and Peripherals Configuration
SM 1-3 M156/M157/M176/M177
Product
Information
1.2 MACHINE CODES AND PERIPHERALS
CONFIGURATION
1.2.1 MAIN FRAME
Item Machine
Code Duplex Optional Tray PCL PS Wireless LAN Remarks
SP 310SFN M176 Auto N/A Yes N/A N/A NEW
SP 310SFN w M177 Auto N/A Yes N/A Yes NEW
SP 311SFN M156 Auto N/A Yes N/A N/A NEW
SP 311SFN w M157 Auto N/A Yes N/A Yes NEW
NA: NotAvailable

Specifications
M156/M157/M176/M177 1-4 SM
1.3 SPECIFICATIONS
See "Appendices" for the following information:
"General Specifications"
"Supported Paper Sizes"
"Software Accessories"

INSTALLATION
REVISION HISTORY
Page Date Added/Updated/New
None

Installation Requirements
SM 2-1 M156/M157/M176/M177
Installation
2. INSTALLATION
2.1 INSTALLATION REQUIREMENTS
2.1.1 CHECK IMAGE QUALITY / SETTINGS
This machine is installed by the user.
Environment
1. Temperature Rage: 10°C to 32°C (50°F to 89.6°F)
2. Humidity Range: 15% to 80% RH
3. Ambient Illumination: Less than 2,000 lux (do not expose to direct sunlight)
4. Ventilation: 3 times/hr/person
5. Do not install the machine at locations over the following heights above sea level.
All areas: 2,000 m (6,562 ft.)
6. Atmospheric pressure: more than 740 hPa.
2.1.2 MOVING AND TRANSPORTING THE MACHINE
It is dangerous to handle the power cord plug with wet hands. Doing so could result in
electric shock.
Unplug the power cord from the wall outlet before you move the machine. While moving
the machine, take care that the power cord is not damaged under the machine. Failing to
take these precautions could result in fire or electric shock.