Ricoh B174 Operator's manual

B174
SERVICE DOCUMENTATION
001955MIU
RICOH GROUP COMPANIES

B174
SERVICE DOCUMENTATION
RICOH GROUP COMPANIES
®
®

B174
SERVICE
DOCUMENTATION
001955MIU

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 Corporation and its member companies.
NO PART OF THIS DOCUMENT MAY BE REPRODUCED IN ANY
FASHION AND DISTRIBUTED WITHOUT THE PRIOR
PERMISSION OF RICOH CORPORATION.
A
ll 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 o
f
any trade name, or web site is intended to convey endorsement or othe
r
affiliation with Ricoh products.
2004 RICOH Corporation. All rights reserved.

The Service Manual contains information
regarding service techniques, procedures,
p
rocesses and spare parts of office equipmen
t
distributed by Ricoh Corporation. Users of this
manual should be either service trained o
r
certified by successfully completing a Ricoh
Technical Training Program.
Untrained and uncertified users utilizin
g
information contained in this service manual to
repair or modify Ricoh equipment risk persona
l
injury, damage to property or loss of warrant
y
p
rotection.
Ricoh Corporation
WARNING

LEGEND
PRODUCT CODE COMPANY
GESTETNER LANIER RICOH SAVIN
B174 DSm515pfd AC106d AC204 AC204
DOCUMENTATION HISTORY
REV. NO. DATE COMMENTS
* 6/2004 Original Printing

SM i B174
B174
TABLE OF CONTENTS
INSTALLATION
1. INSTALLATION............................................................................ 1-1
PREVENTIVE MAINTENANCE
2. PREVENTIVE MAINTENANCE.................................................... 2-1
REPLACEMENT AND ADJUSTMENT
3. REPLACEMENT AND ADJUSTMENT ........................................ 3-1
3.1 GENERAL PRECAUTIONS ON DISASSEMBLY ......................................3-1
Releasing Plastic Latches.....................................................................3-1
3.2 REAR COVER...........................................................................................3-2
3.3 SCANNER ASS'Y......................................................................................3-3
3.4 ADF ASS'Y ................................................................................................3-9
3.5 OPE ASS'Y (ALSO KNOWN AS ‘OP-PORT’) .........................................3-11
3.6 RIGHT COVER ASS'Y ............................................................................3-12
Multi Purpose (MP) Tray (Also known as Bypass Tray)......................3-13
Duplex Ass’y .......................................................................................3-14
Transfer Roller Ass’y...........................................................................3-14
3.7 FUSER ASS'Y (ALSO KNOWN AS ‘FUSING UNIT’) ..............................3-15
3.8 EXIT ASS'Y .............................................................................................3-17
3.9 COPY TRAY............................................................................................3-18
3.10 DRIVE ASS'Y ........................................................................................3-19
3.11 SMPS & HVPS (ALSO KNOWN AS ‘PSU’ AND ‘POWER PACK) ........3-20
3.12 LSU (LASER SCANNING UNIT) ...........................................................3-21
3.13 LEFT COVER ........................................................................................3-22
3.14 MAIN FRAME ASS'Y.............................................................................3-23
3.15 MP ASS'Y (MULTI PURPOSE ASS’Y) ..................................................3-25
3.16 FEED ASS'Y..........................................................................................3-27
3.17 PICK UP ASS'Y .....................................................................................3-28
3.18 MAIN BOARD........................................................................................3-29
3.19 LIU BOARD ...........................................................................................3-30
TROUBLESHOOTING
4. TROUBLESHOOTING ................................................................. 4-1
4.1 ERROR MESSAGES ................................................................................4-1
4.2 ABNORMAL IMAGE PRINTING AND DEFECTIVE ROLLERS.................4-3
4.3 TROUBLESHOOTING ..............................................................................4-4
4.3.1 SCANNER ........................................................................................4-4

B174 ii SM
COPY....................................................................................................4-4
PC-SCAN..............................................................................................4-5
4.3.2 FAX...................................................................................................4-6
FAX/TELEPHONE PRECAUTIONS .....................................................4-6
4.3.3 PRINT QUALITY...............................................................................4-7
No Image ............................................................................................4-10
All Black ..............................................................................................4-12
Vertical White Line (Band) ..................................................................4-13
Dark Image .........................................................................................4-14
Background.........................................................................................4-15
Ghost ..................................................................................................4-16
Black Spot...........................................................................................4-17
Horizontal Band ..................................................................................4-18
Irregular Density .................................................................................4-19
White Spot ..........................................................................................4-20
Trembling at the End When OHP Printing ..........................................4-21
Poor Fusing Grade..............................................................................4-22
4.3.4 MALFUNCTION..............................................................................4-23
No Power (LCD NO display LED Off) .................................................4-26
Fuser Error..........................................................................................4-27
Paper Jam (Mis-Feeding) ...................................................................4-28
Paper Jam (Jam 1) .............................................................................4-29
Engine Error........................................................................................4-30
4.3.5 TONER CARTRIDGE AND DRUM CARTRIDGE SERVICE ..........4-31
Precautions on Safe-keeping of the Drum Cartridge ..........................4-31
Service for the Life of Toner Cartridge ................................................4-31
Symptoms of a defective toner cartridge.............................................4-32
4.3.6 PROBLEMS CAUSED BY SOFTWARE.........................................4-35
The printer is not working (1) ..............................................................4-35
The printer is not working (2) ..............................................................4-36
Abnormal Printing ...............................................................................4-37
Spooling Error.....................................................................................4-38
SERVICE TABLES
5. SERVICE TABLES....................................................................... 5-1
5.1 USER MODE .................................................................................................5-1
5.2 TECH MODE .............................................................................................5-3
5.2.1 HOW TO ENTER SERVICE MODE .................................................5-3
5.2.2 SETTING UP THE SYSTEM IN TECH MODE .................................5-3
5.2.3 SYSTEM DATA ................................................................................5-5
DIALING MODE....................................................................................5-5
MODEM SPEED...................................................................................5-5
ERROR RATE ......................................................................................5-5
SET TX LEVEL .....................................................................................5-5
SILENCE TIME.....................................................................................5-5
5.2.4 MEMORY CLEAR.............................................................................5-6
CLEAR ALL MEMORY .........................................................................5-6

SM iii B174
5.2.5 MAINTENANCE ...............................................................................5-6
CLEAN DRUM ......................................................................................5-6
NOTIFY TONER LOW ..........................................................................5-6
SWITCH TEST .....................................................................................5-6
MODEM TEST......................................................................................5-7
SRAM TEST .........................................................................................5-7
DRAM TEST .........................................................................................5-7
ROM TEST ...........................................................................................5-7
PATTERN TEST...................................................................................5-7
CLEAR COUNT ....................................................................................5-7
ANSWER ON CNG...............................................................................5-7
ADJUST SHADING...............................................................................5-8
FLASH UPGRADE................................................................................5-8
PROGRAM DIAL ..................................................................................5-8
REMOTE TEST ....................................................................................5-8
5.2.6 REPORTS/HELP..............................................................................5-9
PROTOCOL DUMP LIST......................................................................5-9
SYSTEM DATA ....................................................................................5-9
5.3 IDENTIFY SALE DATE .............................................................................5-9
5.4 FIRMWARE DOWNLOAD.......................................................................5-10
5.4.1 LOCAL MACHINE UPDATE...........................................................5-10
RCP (Remote Control Panel) mode....................................................5-10
To get the system data list ..................................................................5-10
5.4.2 RE-PROGRAMMING PROCEDURE AFTER DOWNLOAD ...........5-11
5.4.3 RECOVERY PROCEDURE............................................................5-11
5.4.4 REMOTE MACHINE UPDATE .......................................................5-11
How to update firmware by remote fax ...............................................5-11
5.5 PROCEDURE TO SET COUNTRY CODE..............................................5-12
Procedure ...........................................................................................5-12
5.6 ENGINE TEST MODE.............................................................................5-13
5.6.1 TO ENTER THE ENGINE TEST MODE.........................................5-13
5.6.2 DIAGNOSTIC .................................................................................5-13
5.6.3 STATUS PRINT..............................................................................5-14
DETAILED DESCRIPTIONS
6. DETAILED DESCRIPTION .......................................................... 6-1
6.1 MAIN PBA (ALSO KNOWN AS MAIN BOARD) ........................................6-1
6.1.1 SUMMARY .......................................................................................6-1
6.2 CIRCUIT OPERATION..............................................................................6-2
6.2.1 FAX TRANSCEIVER ........................................................................6-2
General .................................................................................................6-2
Modem (u44) ........................................................................................6-2
6.3 SCANNER .................................................................................................6-2
6.3.1 SUMMARY .......................................................................................6-2
CCD ......................................................................................................6-2

B174 iv SM
6.3.2 KEY FEATURES ..............................................................................6-3
Overview...............................................................................................6-3
Pixel processing structure.....................................................................6-3
Shading Correction ...............................................................................6-3
Gamma Correction................................................................................6-3
Binary conversion (mono) .....................................................................6-4
Scaling of input image...........................................................................6-4
Intelligent scan motor controller ............................................................6-4
Auto-Run...............................................................................................6-4
Processed data output format in DTM (Data Transfer Module) ............6-4
Others ...................................................................................................6-4
6.4 SMPS & HVPS (ALSO KNOWN AS PSU AND POWER PACK)...............6-5
6.4.1 SUMMARY OF SMPS ......................................................................6-5
6.4.2 SUMMARY OF HVPS.......................................................................6-5
6.5 ENGINE CONTROLLER ...........................................................................6-5
6.5.1 FUSING CONTROL/THERMISTOR CIRCUIT .................................6-5
6.5.2 PAPER DETECTION CIRCUIT ........................................................6-6
1) Cover Open Detection ......................................................................6-6
2) Paper Empty Detection.....................................................................6-6
3) Paper Feeding ..................................................................................6-6
4) Paper Exit Detection .........................................................................6-6
6.6 LIU (ALSO KNOWN AS NCU)...................................................................6-7
6.6.1 SUMMARY .......................................................................................6-7
6.6.2 DIALER.............................................................................................6-7
TONE DIAL...........................................................................................6-7
PULSE DIAL .........................................................................................6-7
SPECIFICATIONS
SPECIFICATIONS
1. GENERAL SPECIFICATIONS.....................................................................7-1
2. PRINT SPECIFICATION .............................................................................7-2
3. SCAN SPECIFICATION ..............................................................................7-2
4. COPY SPECIFICATION..............................................................................7-3
5. TELEPHONE SPECIFICATION ..................................................................7-3
6. FAX SPECIFICATION .................................................................................7-3
7. PAPER HANDLING.....................................................................................7-4
8. CONSUMABLES .........................................................................................7-4
APPENDIX
APPENDIX
BLOCK DIAGRAMS.........................................................................................8-1
CONNECTION DIAGRAMS.............................................................................8-2
PARTS CATALOG
SEE PARTS CATALOG SECTION FOR DETAILED TABLE OF CONTENTS

PRECAUTIONS
Please carefully read the cautions below to prevent accidents while servicing the
machine.
WARNING FOR SAFETY
1. Request the service by qualified service person.
The service for this machine must be performed by a qualified service person.
It is dangerous if an unqualified service person or user tries to repair the
machine.
2. Do not rebuild it discretionary.
Do not disassemble, fix, and rebuilt the machine. If you do, the machine may
not work and an electric shock or a fire can occur.
3. Laser Safety Statement
The Printer is certified in the U.S. to conform to the requirements of DHHS 21
CFR, chapter 1 Subchapter J for Class 1(1) laser products, and elsewhere, it is
certified as a Class I laser product conforming to the requirements of IEC 825.
Class I laser products are not considered to be hazardous. The laser system
and printer are designed so there is never any human access to laser radiation
above a Class I level during normal operation, user maintenance, or prescribed
service condition.
WARNING
Never operate or service the printer with the protective cover removed from
Laser/Scanner assembly. The reflected beam, although invisible, can
damage your eyes. When using this product, these basic safety
precautions should always be followed to reduce risk of fire, electric shock,
and injury to persons.
CAUTION - INVISIBLE LASER RADIATION
WHEN THIS COVER OPEN.
DO NOT OPEN THIS COVER.
VORSICHT - UNSICHTBARE LASERSTRAHLUNG,
WENN ABDECKUNG GE…FFNET.
NICHT DEM STRAHL AUSSETZENz
ATTENTION - RAYONNEMENT LASER INVISIBLE EN CAS
DÕOUVERTURE. EXPOSITION DANGEREUSE
AU FAISCEAU.
ATTENZIONE - RADIAZIONE LASER INVISIBILE IN CASO DI
APERTURA. EVITARE LÕESPOSIZIONE AL
FASCIO.
PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE.
EVITAR EXPONERSE AL RAYO.
ADVARSEL. - USYNLIG LASERSTR LNING VED BNING, N R
SIKKERHEDSBRYDERE ER UDE AF FUNKTION.
UNDG UDSAETTELSE FOR STR LNING.
ADVARSEL. - USYNLIG LASERSTR LNING N R DEKSEL
PNES. STIRR IKKE INN I STR LEN.
UNNG EKSPONERING FOR STR LEN.
VARNING - OSYNLIG LASERSTR LNING N R DENNA DEL
R PPNAD OCH SP RREN R URKOPPLAD.
BETRAKTA EJ STR LEN. STR LEN R FARLIG.
VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA
OLET ALTTIINA N KYM TT M LLE LASER-
S TEILYLLE L KATSO S TEESEEN.
CAUTION.WMF

CAUTION FOR SAFETY
PRECAUTION RELATED NOXIOUS MATERIAL
It is possible to be harmed from noxious material if you ignore the below
information.
1. Do not touch the damaged LCD. Noxious liquid to a human body exists in the
LCD. If it is got into the mouth, immediately see a doctor. If it gets into the eyes
or on the skin, immediately wash off with flowing water for 15 minutes and then
see a doctor.
2. The toner in a printer cartridge contains a chemical material, if swallowed,
might harm a human body.
Please keep the toner cartridge away from children.
PRECAUTION RELATED ELECTRIC SHOCK OR FIRE
It is possible to get an electric shock or burn by fire if you don't follow the
instructions of the manual.
1. Use the exact voltage and wall socket. If not, a fire or an electric leakage can
occur.
2. Use an authorized power cord. Use the power code supplied with machine. A
fire can occur when an over current condition flows in the power cord.
3. Do not insert many cords into an outlet. A fire can occur due to an over current
condition in the outlet.
4. Do not put water or other liquid, pin, clip, etc in the machine. It can cause a fire,
electric shock, or malfunction. If this occurs, immediately turn off the power off
and remove the power plug from outlet.
5. Do not touch the power plug with a wet hand. When servicing, remove the
power plug from the outlet.
6. Use caution when inserting or unplugging the power plug. The power plug has
to be inserted completely. If not, a fire can occur due to a poor contact. When
unplugging the power cord, grip the plug, not the wire.
7. Do not bend, twist, bind or place other materials on the power cord. Do not use
staples around machine. If the power cord becomes damaged, a fire or electric
shock can occur. A damaged power code must be replaced immediately. Do
not attempt to repair the damaged cord or reuse it. Repairing the cord with
plastic tape can cause a fire or electric shock. Do not spread chemicals or
insecticide on the power cord
8. Check whether the power outlet and the power plug are damaged, compressed
or cracked. When such inferiorities are found, replace it immediately. Do not roll
over the cord when moving the machine.

9. Use caution during lightning storms. It may cause a fire or electric shock.
Unplug the power plug off under these conditions. Do not touch cable and
device during a lightning storm.
10. Avoid damp or dusty areas. Do not install the machine in dusty areas or around
humidifiers. A fire can occur. Clean the plug with dried fabric cloth to remove
dust.
11. Avoid direct sunlight. Do not install the machine near to a window where it is in
direct sunlight. If the machine operates in direct sunlight for a long periods, the
machine may not work correctly, because the increased inner temperature of
machine.
12. Turn off the machine and unplug the power cord when smoke, a strange smell,
or sound is detected from the machine. A fire can occur if the machine is used
under these conditions.
13. Do not insert steel or metal pieces inside/outside of the machine. Do not insert
metal pieces into the ventilator slots. An electric shock can occur.
PRECAUTION RELATED TO HANDLING THE MACHINE
If you ignore this information, you could get harm and machine could be damaged.
1. Do not install the machine on an uneven surface or slanted floor. Confirm that
the machine is correctly balanced after installation. The machine may fall over if
not balanced correctly.
2. Be careful not to insert a finger or hair in the rotating unit (motor, fan, paper
feeding part, etc) while the machine is operation.
3. Do not place any containers of water or chemical or small metals on top of the
machine. If these objects spill into the machine, a fire or electric shock can
occur.
4. Do not install the machine in areas where moisture or dust exists. For example,
do not install machine near open windows.
5. Do not place candles, burning cigarettes, etc. on the machine. Do not install it
near to a heater.

PRECAUTIONS FOR WHEN ASSEMBLY/DISASSEMBLY
Replace parts very carefully. Remember the location of each cable before
removing parts, in order to reconnect it afterwards. Please perform the steps below
before replacing or disassembling any parts.
1. Check the contents stored in the memory. Either print a copy of stored data or
write down all of the needed information. All the stored information will be
erased when the main board is replaced.
2. Disconnect the power cord before servicing or replacing electrical parts.
3. Remove the printer cable.
4. Use formal parts and same standardized goods when replacing parts. Check
the product name, part code, rated voltage, rated current, operating
temperature, etc.
5. Do not use excessive force when loosening or tightening plastic components.
6. Be careful not to drop small parts or objects in the machine.
ESD PRECAUTIONS
Certain semiconductor devices can be easily damaged by static electricity. Such
components are commonly called “Electro statically Sensitive (ES) Devices”, or
ESD’s. Examples of typical ESD’s are: integrated circuits, some field effect
transistors, and semiconductor “chip” components.
The techniques outlined below should be followed to help reduce the incidence of
component damage caused by static electricity.
CAUTION
Be sure no power is applied to the chassis or circuit, and observe all other
safety precautions.
1. Immediately before handling a semiconductor component or semiconductor-
equipped assembly, drain off any electrostatic charge on your body by touching
a known earth ground. Alternatively, use a commercially available wrist strap
device, which should be removed for your personal safety reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD’s, place the
assembly on a conductive surface, such as aluminum or copper foil, or
conductive foam, to prevent electrostatic charge buildup in the vicinity of the
assembly.
3. Use only a grounded tip soldering iron to solder an ESD’s.