Ricoh AC204 Service Manual

SERVICE DOCUMENTATION

RICOH GROUP COMPANIES

B174

001955MIU

SERVICE DOCUMENTATION

B174

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.

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 any trade name, or web site is intended to convey endorsement or othe affiliation with Ricoh products.

WARNING

The Service Manual contains information regarding service techniques, procedures,

rocesses and spare parts of office equipmen distributed by Ricoh Corporation. Users of this manual should be either service trained o certified by successfully completing a Ricoh Technical Training Program.

Untrained and uncertified users utilizin information contained in this service manual to repair or modify Ricoh equipment risk persona injury, damage to property or loss of warrant

rotection.

Ricoh Corporation

LEGEND

PRODUCT CODE COMPANY

B174 DSm515pfd AC106d AC204 AC204

GESTETNER LANIER RICOH SAVIN

DOCUMENTATION HISTORY

REV. NO. DATE COMMENTS

6/2004 Original Printing

B174

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

SM i B174

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

B174 ii SM

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

SM iii B174

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

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

BLOCK DIAGRAMS.........................................................................................8-1

CONNECTION DIAGRAMS.............................................................................8-2

PARTS CATALOG

SEE PARTS CATALOG SECTION FOR DETAILED TABLE OF CONTENTS

B174 iv SM

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.

ATTENTION - RAYONNEMENT LASER INVISIBLE EN CAS

ATTENZIONE - RADIAZIONE LASER INVISIBILE IN CASO DI

PRECAUCION - RADIACION LASER IVISIBLE CUANDO SE ABRE.

ADVARSEL. - USYNLIG LASERSTR LNING VED BNING, N R

ADVARSEL. - USYNLIG LASERSTR LNING N R DEKSEL

VARNING - OSYNLIG LASERSTR LNING N R DENNA DEL

VARO! - AVATTAESSA JA SUOJALUKITUS OHITETTAESSA

NICHT DEM STRAHL AUSSETZENz

DÕOUVERTURE. EXPOSITION DANGEREUSE AU FAISCEAU.

APERTURA. EVITARE LÕESPOSIZIONE AL FASCIO.

EVITAR EXPONERSE AL RAYO.

SIKKERHEDSBRYDERE ER UDE AF FUNKTION. UNDG UDSAETTELSE FOR STR LNING.

PNES. STIRR IKKE INN I STR LEN. UNNG EKSPONERING FOR STR LEN.

R PPNAD OCH SP RREN R URKOPPLAD. BETRAKTA EJ STR LEN. STR LEN R FARLIG.

OLET ALTTIINA N KYM TT M LLE LASERS 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 semiconductorequipped 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.

4. Only use an “anti-static” solder removal device. Some solder removal devices not classified as “anti-static” and can generate an electrical charge sufficient to damage ESD’s.

5. Do not use Freon-propelled chemicals. When sprayed, these can generate electrical charges sufficient to damage ESD’s.

6. Do not remove a replacement ESD from its protective packaging until immediately before installing it. Most replacement ESD’s are packaged with all leads shorted together by conductive foam, aluminum foil, or a comparable conductive material.

7. Immediately before removing the protective shorting material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

8. Maintain continuous electrical contact between the ESD and the assembly into which it will be installed, until completely plugged or soldered into the circuit.

9. Minimize bodily motions when handling unpackaged replacement ESD’s. Normal motions, actions such as brushing together of clothing fabric or lifting one’s foot from a carpeted floor, can generate static electricity sufficient to damage an ESD.