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B174

Ricoh B174 Service Documentation

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Page 1
B174
SERVICE DOCUMENTATION
001955MIU
RICOH GROUP COMPANIES
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Page 3
SERVICE DOCUMENTATION
RICOH GROUP COMPANIES
®
®
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B174
SERVICE
DOCUMENTATION
001955MIU
Page 6
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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.
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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
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LEGEND
PRODUCT CODE COMPANY
GESTETNER LANIER RICOH SAVIN
B174 DSm515pfd AC106d AC204 AC204
DOCUMENTATION HISTORY
REV. NO. DATE COMMENTS
*
6/2004 Original Printing
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SM i 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
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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
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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
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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
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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 LASER­S TEILYLLE L KATSO S TEESEEN.
CAUTION.WMF
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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.
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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.
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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.
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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.
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INSTALLATION
PREVENTIVE MAINTENANCE
REPLACEMENT AND ADJUSTMENT
TROUBLESHOOTING
SERVICE TABLES
DETAILED DESCRIPTIONS
SPECIFICATIONS
APPENDIX
TAB
POSITION 2
TAB
POSITION 1
TAB
POSITION 3
TAB
POSITION 4
TAB
POSITION 6
TAB
POSITION 5
TAB
POSITION 8
TAB
POSITION 7
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Page 25
INSTALLATION
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INSTALLATION
SM 1-1 B174
Installation
1. INSTALLATION
Refer to the operating instructions.
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PREVENTIVE MAINTENANCE
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PREVENTIVE MAINTENANCE
SM 2-1 B174
Preventive
Maintenance
2. PREVENTIVE MAINTENANCE
The replacement cycle interval shown below is for maintenance.
Environmental conditions and differences in how the machine is used will change this interval.
The cycle period shown is for reference only.
Component Replacement Cycle Done by
ADF Rubber Pad Ass’y 20,000 Pages Service
Scanner
ADF Pick-up Ass’y 50,000 Pages Service Rubber - Paper Pick-up - Right Rubber - Paper Pick-up - Left
75,000 Pages Service
Transfer Roller 75,000 Pages Service
Printer
Fuser 75,000 Pages Service
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REPLACEMENT AND ADJUSTMENT
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GENERAL PRECAUTIONS ON DISASSEMBLY
SM 3-1 B174
Replacement
Adjustment
3. REPLACEMENT AND ADJUSTMENT
3.1 GENERAL PRECAUTIONS ON DISASSEMBLY
When you disassemble and assemble components, you must use extreme caution.
Cables are near parts that move. Because of this, install the cables carefully. If components are removed, cables moved during the procedure must be put as near as possible to their initial positions. Before you remove a component from the machine, make a note of the cable routing.
Before you do work on the machine, you must do these steps:
1. Make sure that no documents are stored in memory.
2. Disconnect the power cord.
3. Remove the toner and drum cartridges before you disassemble parts.
4. Use a flat and clean surface.
5. Replace only with approved components.
6. Be careful when you remove plastic components. Do not use force.
7. Make sure that all components are in their correct positions.
Releasing Plastic Latches
Many parts set in their positions with plastic latches. The latches break easily. Release them carefully. Push the hook end of the latch away from the part to which it is latched to remove these parts.
B174R979.WMF
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REAR COVER
B174 3-2 SM
3.2 REAR COVER
1. Remove the six screws that hold the Rear Cover.
2. Remove the Rear Cover [A] as shown.
B174R900.WMF
[A]
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SCANNER ASS'Y
SM 3-3 B174
Replacement
Adjustment
3.3 SCANNER ASS'Y
1. Before you remove the Scanner Ass'y [A], you must remove:
- Rear Cover (!3.2)
2. Disconnect the connector and the CCD cable [B]. NOTE: To prevent damage to the
CCD cable connector, pull the cable out carefully. Pull in a line with the connector, not at an angle.
3. Remove the three screws, as shown.
4. Open the Right Cover assembly [C] first to open the Front Cover [D].
• Close the front cover first when you assemble the machine.
B174R902.WMF
B174R903.WMF
1
2
B174R904.WMF
[A]
[B]
[C]
[D]
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SCANNER ASS'Y
B174 3-4 SM
5. Remove two screws.
6. Pull up the Scanner Ass'y [A] in the direction of the arrow.
7. Disconnect the connector [B] from the Platen Ass'y.
B174R905.WMF
B174R906.WMF
B174R907.WMF
[A]
[B]
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SCANNER ASS'Y
SM 3-5 B174
Replacement
Adjustment
8. Open the Platen Ass’y [A] as shown by the arrow. Pull up the Platen Ass'y and remove it.
9. Remove the three screws securing the Platen Ass’y.
10. Pull up the OPE Ass'y [B] and remove it ( x 1).
B174R909.WMF
B174R908.WMF
B174R978.WMF
[A]
[B]
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SCANNER ASS'Y
B174 3-6 SM
11. Remove the five screws that hold the Scan Upper Ass'y [A].
12. Remove the Scan Upper Ass'y that holds the platen glass [B]. (Release one hook [C].) NOTE: When you disassemble the
Scan Ass’y, make sure that your work area is clean. Dirt or dust on the scan head can cause unsatisfactory scanned image quality.
13. Remove the Dummy Upper Ass’y [D] ( x 2).
B174R910.WMF
B174R911.WMF
B174R912.WMF
[D]
[A]
[C]
[B]
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SCANNER ASS'Y
SM 3-7 B174
Replacement
Adjustment
14. Remove the Channel Base Frame [A] ( x 4).
15. Remove the Dummy Scan-Lower [B] ( x 5).
16. Remove the CCD cable [C].
B174R913.WMF
B174R914.WMF
B174R915.WMF
[A]
[B]
[C]
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SCANNER ASS'Y
B174 3-8 SM
17. Pull up the Shaft CCD [A], and remove the Scanner Unit [B].
18. Remove the Motor Bracket [C] ( x 3).
19. Disconnect the OPE Harness [D] from the Platen board [E]. Remove the Platen board ( x 2).
NOTE: Be very careful when you attach the
CCD Unit back to the Platen Ass'y. The CCD Unit is on the right side of the Belt Tension Spring [F].
B174R916.WMF
B174R917.WMF
B174R918.WMF
B174R919.WMF
[A]
[B]
[D]
[E]
[F]
[C]
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ADF ASS'Y
SM 3-9 B174
Replacement
Adjustment
3.4 ADF ASS'Y
1. Before you remove the ADF Ass'y [A], you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
2. Remove the five screws from the Platen Ass’y.
3. Open the ADF Upper Cover [B]. Remove Side Cover R [C]. Release Side Cover L [D]. To do this, use a sharp tool or small screwdriver as shown [E]. Then remove Side Cover L.
4. Pull up the ADF Ass'y [F] and remove it.
B174R920.WMF
B174R921.WMF
B174R922.WMF
[A]
[B]
[C]
[D]
[F]
[E]
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ADF ASS'Y
B174 3-10 SM
5. Remove the ADF Upper Cover [A].
6. Remove the ADF Pick-up Ass’y [B] (!
2). Remove the ADF Upper [C] ( x 4).
[D]: ADF Rubber Pad Ass’y (! 2)
7. Remove the ADF Motor ass'y [E] ( x 3).
B174R923.WMF
B174R924.WMF
B174R925.WMF
[B]
[C]
[A]
[D]
[E]
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OPE ASS'Y (ALSO KNOWN AS ‘OP-PORT’)
SM 3-11 B174
Replacement
Adjustment
3.5 OPE ASS'Y (ALSO KNOWN AS ‘OP-PORT’)
1. Before you remove the OPE Ass'y, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
2. Remove the OPE board [A] and the LCD Module [B] from the OPE Cover [C] ( x 10).
3. Remove the contact rubbers [D] from the unit.
4. Remove the key pad [E] from the unit.
B174R926.WMF
B174R927.WMF
B174R928.WMF
[A]
[B]
[C]
[D]
[E]
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RIGHT COVER ASS'Y
B174 3-12 SM
3.6 RIGHT COVER ASS'Y
1. Remove two screws to release the Stopper [A] (Main Frame side) that holds the Right Cover [B] to the Main Frame.
2. Fully open the Right Cover door [C]. Lift the left hand hinge " to release it. Then push the door assembly to the left to release the right hand hinge #.
B174R929.WMF
1
2
B174R930.WMF
[A]
[B]
[C]
Page 47
RIGHT COVER ASS'Y
SM 3-13 B174
Replacement
Adjustment
Multi Purpose (MP) Tray (Also known as Bypass Tray)
1. To disassemble the MP tray, release the lower hinges ".
2. As shown at ", align the door supports in a horizontal position. This will let you remove the Tray-Case [A] from the Tray Links. To remove the Tray-Links [B], adjust the position of the Tray Links to a 45-degree angle to align the slot in the
link correctly, as shown at #.
1
1
B174R931.WMF
1
2
B174R932.WMF
[A] [B]
Page 48
RIGHT COVER ASS'Y
B174 3-14 SM
Duplex Ass'y
1. Remove the Duplex Ass'y [A] from the Side Door Ass'y [B] (release the plastic clips, 2 on each side).
Transfer Roller Ass'y
1. Remove the Transfer Roller Ass’y [B] (!2).
B174R933.WMF
B174R934.WMF
[A]
[B]
[B]
Page 49
FUSER ASS'Y (ALSO KNOWN AS ‘FUSING UNIT’)
SM 3-15 B174
Replacement
Adjustment
3.7 FUSER ASS'Y (ALSO KNOWN AS ‘FUSING UNIT’)
CAUTION
The fusing unit has tapping screws. Assembly/disassembly should be kept to a minimum. Adjustments again and again can cause failure. To avoid hazardous situations, do not replace any components inside the fusing unit such as thermistor, thermostat, hot roller, stripper pawls, fusing lamp, etc.
1. Before you remove the Fuser Ass'y, you must make sure that power is off. Then remove:
- Rear Cover Ass'y (! 3.2)
- Right Cover Ass'y (! 3.6)
2. Remove the Connector Cover [A] and the Cover Bracket [B] ( x 1 each).
3. Disconnect one connector [C].
B174R935.WMF
B174R936.WMF
[B]
[A]
[C]
Page 50
FUSER ASS'Y (ALSO KNOWN AS ‘FUSING UNIT’)
B174 3-16 SM
4. Remove the Fuser Ass'y [A] ( x 3). (! 2)
B174R937.WMF
[A]
Page 51
EXIT ASS'Y
SM 3-17 B174
Replacement
Adjustment
3.8 EXIT ASS'Y
1. Before you remove the Exit Ass'y, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
2. Remove four screws. Then, remove the harness from the Exit Upper. Disconnect four connectors and unlatch the Dummy Base Frame [A], as shown.
3. Move the Exit Roller Release Lever [B] to the vertical position as shown in the diagram. Then, lift the Exit Ass'y [C] to remove it.
B174R941.WMF
B174R942.WMF
[A]
[C]
[B]
Page 52
COPY TRAY
B174 3-18 SM
3.9 COPY TRAY
1. Before you remove the Copy Tray, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
2. Remove the Copy Tray [A] ( x 2).
B174R943.WMF
[A]
Page 53
DRIVE ASS'Y
SM 3-19 B174
Replacement
Adjustment
3.10 DRIVE ASS'Y
1. Before you remove the Drive Ass'y, you must remove:
- Rear Cover (! 3.2)
2. Unplug two connectors. (for Main Motor [A]: 9-pin, for Duplex Solenoid [B]: 2-pin)
3. Remove the Fan [C] and Duct - Fan [D] ( x 1).
4. Remove the Drive Ass'y [E] ( x 5).
B174R944.WMF
B174R945.WMF
B174R946.WMF
[C]
[D]
[A]
[B]
[E]
Page 54
SMPS & HVPS (ALSO KNOWN AS ‘PSU’ AND ‘POWER PACK)
B174 3-20 SM
3.11 SMPS & HVPS (ALSO KNOWN AS ‘PSU’ AND ‘POWER PACK)
1. Before you remove the SMPS & HVPS, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
- Copy Tray (! 3.9)
2. Remove the Shield SMPS Upper [A] ( x 3).
3. Disconnect all the connectors.
4. Remove the SMPS & HVPS [B].
B174R947.WMF
B174R948.WMF
B174R949.WMF
[B]
[A]
Page 55
LSU (LASER SCANNING UNIT)
SM 3-21 B174
Replacement
Adjustment
3.12 LSU (LASER SCANNING UNIT)
1. Before you remove the LSU, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
- Copy Tray (! 3.9)
2. Disconnect two connectors.
3. Remove the LSU [A] ( x 3).
B174R950.WMF
B174R951.WMF
[A]
Page 56
LEFT COVER
B174 3-22 SM
3.13 LEFT COVER
1. Before you remove the Left Cover, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
- Exit Ass'y (! 3.8)
- Copy Tray (! 3.9)
- SMPS (! 3.11)
2. Remove the Interface Panel [A] ( x 1).
3. Remove the Left Cover [B] ( x 1).
B174R952.WMF
B174R953.WMF
[B]
[A]
Page 57
MAIN FRAME ASS'Y
SM 3-23 B174
Replacement
Adjustment
3.14 MAIN FRAME ASS'Y
1. Before you remove the LSU, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
- Right Cover Ass'y (! 3.6)
- Fuser (! 3.7)
- Exit Ass'y (! 3.8)
- Copy Tray (! 3.9)
- SMPS (! 3.11)
- LSU (! 3.12)
2. Remove the Dummy Base Frame [A] ( x 5), the Front Cover [B], and the Paper Exit Cam [C].
3. Remove the Deve Lock Lever [D]. Then remove the Cover Motor Bracket [E] ( x 1).
B174R954.WMF
B174R955.WMF
[E]
[D]
[A]
[B]
[C]
Page 58
MAIN FRAME ASS'Y
B174 3-24 SM
4. Disconnect all the connectors.
5. Remove the Main Frame Ass'y [A] ( x 7).
B174R956.WMF
B174R957.WMF
[A]
Page 59
MP ASS'Y (MULTI PURPOSE ASS’Y)
SM 3-25 B174
Replacement
Adjustment
3.15 MP ASS'Y (MULTI PURPOSE ASS’Y)
1. Before you remove the MP Ass’y, you must remove:
- Rear Cover (! 3.2)
- Shield Main Upper (! 3.3)
- Right Cover Ass'y (! 3.6)
2. Disconnect two connectors.
3. Remove the Feed Cover [A] ( x 1).
B174R958.WMF
B174R959.WMF
[A]
Page 60
MP ASS'Y (MULTI PURPOSE ASS’Y)
B174 3-26 SM
4. Remove three screws.
5. Release the SMPS by hand from below, as shown. Pull the MP Ass'y [A] up and remove it.
B174R960.WMF
B174R961.WMF
[A]
Page 61
FEED ASS'Y
SM 3-27 B174
Replacement
Adjustment
3.16 FEED ASS'Y
1. Before you remove the Feed Ass’y, you must remove:
- Rear Cover (! 3.2)
- Scanner Ass'y (! 3.3)
- Right Cover Ass'y (! 3.6)
- Exit Ass'y (! 3.8)
- Copy Tray (! 3.9)
- LSU (! 3.12)
- Main Frame Ass’y (! 3.14)
2. Remove three screws.
3. Pull the Feed Ass'y [A] up and remove it.
B174R962.WMF
B174R963.WMF
[A]
Page 62
PICK UP ASS'Y
B174 3-28 SM
3.17 PICK UP ASS'Y
1. Before you remove the Pick Up Ass’y, you must remove:
- Rear Cover (! 3.2)
- Shield Main Upper (! 3.3)
- Drive Ass'y (! 3.10)
2. Disconnect three connectors.
3. Remove the Cassette Rail [A] ( x 2).
4. Remove the Pick Up Ass'y [B] ( x 4).
[C]: Rubber – Paper Pick-up (2) [D]: Quenching (PTL) Lamp
B174R964.WMF
B174R965.WMF
B174R966.WMF
[A]
[B]
[C]
[D]
Page 63
MAIN BOARD
SM 3-29 B174
Replacement
Adjustment
3.18 MAIN BOARD
1. Before you remove the Main Board, you must remove:
- Rear Cover (! 3.2)
- Right Cover Ass'y (! 3.6)
- Copy Tray (! 3.9)
- SMPS (! 3.11)
2. Remove the Shield Plate [A] ( x 2).
3. Remove the Main Board [B] from the Shield Plate ( x 5).
NOTE: Do a memory clear after you replace the main board. If not, the system
possibly will not operate correctly. (! 5.2.4)
B174R967.WMF
B174R968.WMF
[A]
[B]
Page 64
LIU BOARD
B174 3-30 SM
3.19 LIU BOARD
1. Before you remove the LIU Board, you must remove:
- Rear Cover (! 3.2)
- Right Cover Ass'y (! 3.6)
- Copy Tray (! 3.9)
- SMPS (! 3.11)
- Main Board (! 3.18)
2. Remove one screw and unlatch the LIU Board [A] from the Main Board [B].
B174R969.WMF
[A]
[B]
Page 65
TROUBLESHOOTING
Page 66
Page 67
ERROR MESSAGES
SM 4-1 B174
Trouble-
shooting
4. TROUBLESHOOTING
This chapter includes problem diagnosis and troubleshooting. It shows how to find and repair print quality problems.
4.1 ERROR MESSAGES
Error Message Description Solution
RETRY REDIAL?
The machine is waiting for the programmed interval to automatically redial.
You can press START to immediately redial, or STOP to cancel the redial operation.
COMM. ERROR
A problem with fax communications has occurred.
Try again.
DOCUMENT JAM
A document has jammed in the scanner document feeder
Remove the document jam.
DOOR OPEN
The side cover is not correctly latched
The side door and front door must be closed in the correct order. Open both doors. Close the front door first, then close the side door.
GROUP NOT AVAILABLE
You tried to select a group location where only a single location number can be used (for example, when you add locations for a multi­dial operation).
Try again. Check the location for the group.
LINE ERROR
Your unit cannot connect with the remote machine, or is disconnected because of a problem on the phone line.
Usually caused by a telephone line problem. Try again. If failure continues, wait an hour for the line to clear then try again
LOAD DOCUMENT
You tried to set up a sending operation with no document in the feeder.
Insert a document and try again.
MEMORY FULL The memory is full.
Do one of these: A. Delete documents that are not necessary. B. Transmit again after more memory becomes available
C. Divide the transmission into more than one operation.
NO ANSWER
The remote machine did not answer after all the redial attempts.
Try again. Make sure the remote machine is OK.
Page 68
ERROR MESSAGES
B174 4-2 SM
Error Message Description Solution
NO. NOT ASSIGNED
The speed dial location you tried to use has no number stored in it.
Dial the number manually with the keypad, or store the number.
NO PAPER [ADD PAPER]
There is no paper in the paper cassette. Printing stops until paper is loaded.
Put paper in the paper cassette.
OVERHEAT The printer has overheated.
Your unit will automatically return to the standby mode when it cools down to normal operating temperature. If failure continues, replace the fusing unit or the main PBA.
PAPER JAM 0 OPEN/CLOSE DOOR
Printing paper is jammed in paper feeding area or the pick-up unit
Press STOP and remove the jam.
PAPER JAM 1/2 OPEN/CLOSE DOOR
Printing paper is jammed in the machine main body or in the paper exit unit.
Remove the jam.
TONER LOW
The toner cartridge is almost empty, or toner particles are not equally applied in the cartridge
Remove the toner cartridge and carefully rock it from side to side.
Try again. If problem continues, replace the cartridge.
TONER EMPTY The toner cartridge is empty Replace the toner cartridge.
DRUM WARNING The OPC drum is almost at the end
of its life (14,000 sides)
You have 1000 pages of print life left in the OPC Drum. Continue to use, or install a new OPC drum.
REPLACE DRUM The OPC drum life is expired
(15,000 sides)
Replace the OPC drum cartridge.
NO CARTRIDGE A toner cartridge is not installed. Install the cartridge.
BYPASS JAM Paper feed problem from the
bypass (Manual feed) Tray.
Open the side cover and remove the jam.
DUPLEX JAM Paper feed problem in the duplex
return path
Release the output feed lever and check the output area. Also, open the side door and check the duplex unit.
LINE BUSY The remote fax didn’t answer Try again.
OPEN HEAT ERROR No power to the fusing lamp Check the thermostat,
thermistor, fuser lamp and fuser connector and related wiring. Also check the ‘Fuser On’ signal from main PWA to Power Supply. Check the cable from Main PWA to Power Supply
Page 69
ABNORMAL IMAGE PRINTING AND DEFECTIVE ROLLERS
SM 4-3 B174
Trouble-
shooting
Error Message Description Solution
Heating Error During operation, Temperature
does not go up
Check the thermistor contact point & the fusing lamp.
Scanner Locked Scanner head does not move. Check the transit lock.
Check that the scanner cables are connected. Check the scanner home sensor, scanner motor or drive belt.
4.2 ABNORMAL IMAGE PRINTING AND DEFECTIVE
ROLLERS
If an abnormal image occurs at regular intervals, check the parts shown below.
NO Roller
Abnormal
image period
Kind of abnormal image
1 OPC Drum 94.3 mm White spot. Black spot 2 Charge Roller 37.7 mm White spot. Black spot 3 Supply Roller 35.8 mm Horizontal dark band 4 Develop Roller 44.8 mm Horizontal dark band 5 Transfer Roller 57.8 mm
Contamination on reverse side of paper /
transfer fault 6 Hot Roller 82.5 mm Black spot, White spot 7 Pressure Roller 78.5 mm Contamination on reverse side of paper
Page 70
TROUBLESHOOTING
B174 4-4 SM
4.3 TROUBLESHOOTING
4.3.1 SCANNER
COPY
Problem Items to be checked How to solve
• Make sure that the scanner cover is closed.
• Room lighting can go through thin paper. This causes quality problems
White copy
• Check the shading profile • Do the “Adjust Shading” procedure in Tech mode
• Check the CCD problem in
Main PBA.
• Check the CCD harness contact.
Black copy
• Check shading profile. • Do the “Adjust Shading” procedure in Tech mode.
• Check shading profile. • Do the “Adjust Shading” procedure in Tech mode
• Check the original is lying flat
on the scanner glass.
• A gap above 0.5 mm can cause a blurred image.
Defective image quality
• Check the printing quality. • See “Print” troubleshooting.
• Check the scanner drive
mechanism.
• Check for mechanical problems in the scanner carriage, motor, gearbox, belt and belt tension spring.
• Make sure that the scanner motor position is correct.
Abnormal noise
• Check the Motor Driver chip on the Main PBA.
• If a driver is defective, replace the Main PBA.
Page 71
TROUBLESHOOTING
SM 4-5 B174
Trouble-
shooting
PC-SCAN
Problem Items to be Checked. How to Solve
• Check the printer cable is correctly installed.
• Use a standard IEEE1284 cable.
• Check that the TWAIN driver is installed.
• Remove all other scanner drivers.
• Reboot after you reinstall the TWAIN driver.
• Check the printer port (Parallel) BIOS settings.
• Check the parallel port related items in the CMOS Setup. For a printer port, make sure that ECP is selected.
• Check the harness connection. • Check CN12 connection on the Main PBA
• Check the IEEE1284 signal levels. • If a signal level is defective, replace the Main PBA.
Scanning Error
• Check the USB signal level. • If the USB signal level is defective, replace the Main PBA.
• Check shading profile. • Do the “Adjust Shading” procedure in Tech mode.
Defective image Quality
• Check the gap between original and
scanner glass.
• A gap above 0.5 mm can cause a blurred image.
• Check the Scanner Motor and mechanical problems in the scanner.
• Check for mechanical problems in the scanner carriage, motor, gearbox, belt and belt tension spring.
• Make sure that the scanner motor position is correct.
Abnormal noise
• Check the motor driver in the Main PBA.
• If a driver is defective, replace the Main PBA.
Page 72
TROUBLESHOOTING
B174 4-6 SM
4.3.2 FAX
FAX/TELEPHONE PRECAUTIONS
Problem Items to be Checked. How to Solve
TEL LINE CANNOT BE ENGAGED (NO DIAL TONE)
• When you press the “OHD” key: a) Check the line cord connection. b) Check the MAIN LIU harness,
and CN1
(LIU PBA).
c) Check the relay operation of the
LIU PBA: Is the control signal of CN18 (main) low?
a) Insert it correctly into the
connection jack called
“Line”. b) Replace defective parts. c) Replace the main PBA
IF the control signal of
N18 (main) is high.
Replace the LIU PBA if high but the phone line cannot be connected.
Tone dial is not possible
• Check CN18 (main PBA), MAIN­LIU harness, and CN1 (LIU PBA)
• Replace defective parts.
Tone dial is possible but not pulse dial
• Check DP control signal of CN18­11 of MAIN PBA and the circuit around R15. U6 and Q2 of Liu PBA.
• Replace the LIU PBA.
Defective fax transmission
• Check CN18 (main PBA), MAIN LIU harness, and CN1 (LIU PBA).
• Is the external phone off hook?
• Check ‘hook off’ : Refer to ‘TEL
LINE CANNOT BE ENGAGED’ above.
• Check the transmission path: Check output of CN20-3.4 and T2-4(LIU PBA).
• Check the reception path: Check output CN1-1 (LIU PBA) and input of CN18-1 (main PBA).
• Replace defective parts.
• Replace the LIU PBA if
low.
• Refer to ‘TEL LINE CANNOT BE ENGAGED’ above.
• Replace the main PBA, if abnormal.
• Replace the LIU PBA if CN1-1(LIU PBA) is not confirmed.
• Replace the main PBA if CN20-1(MAIN PBA) is not confirmed.
Defective automatic fax reception
• Is the ring detected? Check the ring signal at CN1-9 (LIU PBA).
• Refer to ‘“Defective Transmission”.
• Replace the LIU PBA if it cannot be checked.
• Refer to “Defective Transmission”.
Page 73
TROUBLESHOOTING
SM 4-7 B174
Trouble-
shooting
4.3.3 PRINT QUALITY
Error Status Check Solution
Vertical black line and band
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
1. Faulty toner cartridge
2. LSU
1. Change the toner cartridge
2. Replace LSU
Vertical white line
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T921.WMF
1. LSU window dirty
2. Toner cartridge
1. Clean the LSU window
2. If not the LSU, change the toner cartridge.
No image
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T922.WMF
1. Is the seal tape removed?
2. OPC is properly grounded?
3. LSU running well?
4. Toner low?
5. Is there video data from the Main PBA?
1. Check and remove tape
2. Measure the resistance between frame ground and the OPC ground spring attached to the frame. Confirm good ground. If faulty, check the ground path through the frame.
3. Replace the LSU
4. Shake the toner cartridge and print. If an image appears, the toner cartridge is empty
5. Print the engine test pattern. If no pattern is printed, replace the Main PBA.
Light image
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T923.WMF
1. Is the seal tape removed?
2. LSU light power normal?
3. Enough toner?
4. High charger voltage?
5. Lower bias voltage
6. Transfer voltage and roller.
7. Contamination of high voltage contact.
1. Check and remove tape
2. Checking LSU light power is difficult. Compare with a new one.
3. Check the toner counter
4~6. Change the HVPS (SMPS) Board.
6. Clean or replace the transfer
roller.
7. Stray toner can increase
contact resistance and cause a bad contact. Clean the contaminated area.
Page 74
TROUBLESHOOTING
B174 4-8 SM
Error Status Check Solution
Dark image
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T924.WMF
1. LSU light power normal?
2. Video data is always supplied?
1. Checking LSU light power is difficult. Compare with a new one.
2. Replace defective board(s)
Background
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T925.WMF
1. High voltage output is normal?
2. C/R of toner cartridge is dirty?
1. Change the HVPS (SMPS) Board.
2. Replace the toner cartridge.
Ghost
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
B174T926.WMF
1. High voltage output.
2. Quenching Lamp.
3. Bad high voltage contact.
1. Change the HVPS Board.
2. Check the quenching lamp comes on – replace the quenching lamp if necessary.
3. Clean inside the machine or replace the toner cartridge.
Stains on back of paper
1. Dirty transfer roller.
2. Toner debris in the paper path
3. Pressure roller dirty
1. Clean the transfer roller with a vacuum cleaner.
2. Clean the paper path with a cloth or air brush.
3. Replace the fusing unit
Poor Fusing
1. Paper quality and finish?
2. Check the fusing unit temperature.
3. The machine was kept at a low temperature for a long time?
1. Should use recommended paper.
2. Measure the thermistor voltage to the Main PBA. It is 2.3V±5% when printing is correct. If not, replace the fusing unit.
3. Re-check after you let the machine come up to room temperature.
Partial blank image (not periodic)
1. Toner is low?
2. The toner cartridge is out of position?
1. Replace the toner cartridge.
2. Check and adjust.
Page 75
TROUBLESHOOTING
SM 4-9 B174
Trouble-
shooting
Error Status Check Solution
Partial blank image (periodic)
1. Developer roller scar or particle. (45 mm)
2. OPC scar or particle. (95 mm)
3. Transfer roller scar or particle. (58 mm)
1. Replace the toner cartridge.
2. Replace the drum cartridge.
3. Replace the transfer roller.
Different image density (left and right)
B174T929.WMF
1. Charge roller’s pressure not balanced
2. Dev. roller and OPC or Dev. roller and blade’s pressure not balanced
3. Transfer roller’s pressure not balanced on each side
1. Replace the drum cartridge.
2. Replace the drum and/or toner cartridge.
3. Check the left and right
springs of the transfer roller and the spring that pushes the development unit inside the machine
Horizontal band
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T928A.WMF
1. Unstable high voltage contact
2. .Charge roller dirty
3. .Dirty hot roller
4. Malfunction of LSU
1. Clean each contact and check good contact
2. Clean the charge roller.
3. Replace the fusing unit
4. Check the Main PBA
Page 76
TROUBLESHOOTING
B174 4-10 SM
No Image
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T922.WMF
No Image?
Self testing
is possible ?
Self test
pattern prints?
Is the OPC
terminal of machine
correctly connected
to the frame?
Does the
video data line to
LSU change High/Low
when printing?
Retest after replacing the connector or main board
Check connection to computer or replace main board
Take out the cartridge and prepare the tester for electronic connection
Repair or replace the GND terminal
Check the path between main board and HVPS. Replace the defective board
The mirror in the LSU might be misplaced, so the light path to the OPC deviates ­Replace the LSU or remove defective parts in the machine
A on next
page
No
No No
Yes Yes
No
No
Yes
Yes
Yes
B174T901.WMF
Page 77
TROUBLESHOOTING
SM 4-11 B174
Trouble-
shooting
Is the connection
terminal OK?
Repair or replace terminal
Replace the toner cartridge
Replace the HVPS
The transfer roller might be out of its location → Put the roller into its correct place The power of the LSU might be low or the light intensity is low due to dirt on the window → Replace the LSU or clean the window
No
No
Yes
Transfer
voltage OK? (on the
transfer roller
shaft)
Are the connection
terminal and connection
correct?
Dev. roller
(-300V) and toner supply
(-450V) voltages
are OK?
Repair or replace terminal
Replace the HVPS
Is the toner
cartridge life expired (see
the counter)?
No
Yes
No
Yes
No
Yes
Yes
A
B174T902.WMF
Page 78
TROUBLESHOOTING
B174 4-12 SM
All Black
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T924.WMF
Is charge
voltage supplied
from HVPS?
The charge terminal contact is bad → Replace the drum cartridge
Check the path between video controller, engine board, HVPS, LSU for a short or open circuit → Replace the defective board or wiring
No
Yes
Does the
video data line to LSU
change High/Low when
printing?
No
Yes
All black in
printing area?
Is the Hsync/
signal received in
LSU?
Yes
No
No
Yes
Replace the HVPS
Replace the LSU
Replace the LSU
B174T903.WMF
Page 79
TROUBLESHOOTING
SM 4-13 B174
Trouble-
shooting
Vertical White Line (Band)
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T921.WMF
Ribs in the fusing unit or toner on the roller may cause this problem
-> Replace the fusing unit or the defective part
The image is originally black or the black part is too close to the top of the page → Print an image that has black more than 10 mm from the top
Dirt or dust stuck on the window of the internal lens of the LSU → Clean it or replace the LSU
Obstacles between OPC or developer and LSU → Remove the obstacles
No
Yes
Check
if the printout
has the same problem just
after it passed
the transfer roller
No
White line missing
definitely?
Yes
Toner might be stuck to the toner metering blade and this prevents toner supply → Replace the toner cartridge
Check if the toner cartridge counter is over its guaranteed life and check the amount of remaining toner → Replace the toner cartridge
B174T904.WMF
Page 80
TROUBLESHOOTING
B174 4-14 SM
Dark Image
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T924.WMF
Works correctly
with -300V of bias
voltage?
The power of the LSU is too high or there is an internal problem → Replace the LSU
No
Yes
Dark selected via
Remote Control
Panel?
Works correctly
after replaced
LSU?
Yes
No
No
Toner over-supply due to incorrect adjustment of metering blade → Replace the toner cartridge
Replace the defective component
Change to Normal and test
Same at Normal?
Yes
END
No
Yes
Yes
B174T905.WMF
Page 81
TROUBLESHOOTING
SM 4-15 B174
Trouble-
shooting
Background
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T925.WMF
Solve the problem under the recommended operating condition (10-32 degrees Centigrade)
Yes
Recommended paper
used?
No
Clean the charge roller or replace the drum cartridge
Yes
Yes
Yes
Dirt or
dust around the
charge roller?
Same problem
occurs?
Print 20 to 30 pages using recommended paper
Check that each terminal or contact are in the correct posiiton and not dirty.
→
Repair or replace components.
Check if the LED of the quenching lamp in the pick up ass'y is on when you push the top cover switch
→
If not, replace the quenching lamp.
Replace HVPS after checking the terminals' contacts
Replace the toner cartridge
Works OK?
END
Operating/
storage atmosphere is too
hot/humid?
Transfer,
charge and developing
voltage are OK?
Yes
END
No
No
No
No
Yes
No
B174T906.WMF
Page 82
TROUBLESHOOTING
B174 4-16 SM
Ghost
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer
B174T926.WMF
Irregularity of the nip between rollers in the toner cartridge → Replace the toner cartridge
Use the machine with recommended paper and conditions
Is it at a regular
interval of 95mm?
There may be a problem with toner layer control in the toner cartridge → Replace the toner cartridge
Is it at a regular
interval of 45mm?
Check the HVPS contacts and HVPS output test mode (see section 5-6)
→
If failed, replace
the HVPS
Yes
No
Dev. roller/
supply roller voltages
OK?
(-300V/-450V)
PTL
(Quenching) lamp
works OK?
Bias voltage is OK?
(-300V)
Operating/
storage temperature is too
low or not recommended
paper used?
Replace the PTL assembly
Is it at a regular
interval
of 58 mm? (transfer
roller interval)
A specific part of the transfer roller is damaged or its resistance is changed → Replace the transfer roller The transfer roller cannot turn correctly due to eccentricity of the transfer roller gears → Replace the defective component
! Replace the HVPS ! Check and repair or
replace the terminal contacts
Replace the HVPS
Transfer voltage is
set to standard?
Yes
No
No
Yes
Yes
Yes
No
No
Yes
No
Yes
No
Yes
B174T907.WMF
Page 83
TROUBLESHOOTING
SM 4-17 B174
Trouble-
shooting
Black Spot
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T927.WMF
When taking
out the cartridge,
toner leaks?
Foreign objetcs stuck to the charge roller → Clean the charge roller.
Bad image
removed by
scratching?
Yes
No
The problem randomly occurred due to falling toner → Clean the machine
No
Yes
Is it a regular
interval of 38 mm?
Toner leaks and a lot of toner dropped onto the paper → Replace the toner cartridge
Check if toner is stuck onto the pressure roller or hot roller in the fusing unit → Clean or replace the fusing unit
Yes
No
B174T908.WMF
Page 84
TROUBLESHOOTING
B174 4-18 SM
Horizontal Band
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T928A.WMF
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T928B.WMF
The black
band has a regular
interval?
The OPC is damaged due to incorrect transfer voltage from the HVPS
→ Replace the HVPS → If the same problem
persists, replace the drum cartridge
The OPC is damaged under direct sunlight for around 5 minutes → If the same problem persists after 10 hours, replace the drum cartridge
No
Yes
Black band is
about 95mm from white
band?
No
Yes
Black band?
95 mm interval?
Yes
No
No
Yes
Problem with internal contacts in the OPC → Replace the drum cartridge
No Hsync/ at the LSU → Replace the LSU
Every 83mm
at a specific
place?
Problems of terminal contact, transfer voltage supply, and transfer roller because the charge roller is defective (38 mm) → Replace the HVPS and/ or drum cartridge
Hot roller defective → Replace the fusing unit
No
Yes
B174T909.WMF
Page 85
TROUBLESHOOTING
SM 4-19 B174
Trouble-
shooting
Irregular Density
B174T929.WMF
OK after
taking out and rocking
the toner
cartridge?
Any dust
on the PTL lamp?
Bad images
around no-image
areas?
Check the high voltage output and repair/ replace terminals, HVPS
No
PTL lamp
(Quenching lamp)
works OK?
Replace the lamp
Light distortion due to a defective mirror or diffused reflection from the LSU → Replace the LSU
Clean the window of the PTL
The guaranteed life of the toner cartridge is over (Check the counter and replace it)
Defective agitator in the toner supply mechanism → Replace the toner cartridge
Irregular toner supply → Replace the toner cartridge
When
printing a gray pattern,
irregular density
persists?
Transfer/
charge/development
voltage drops while
printing?
No No
Yes Yes
Yes
No
Yes
No
Yes
Yes
No
B174T910.WMF
Page 86
TROUBLESHOOTING
B174 4-20 SM
White Spot
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T930.WMF
Transfer
voltage is normal?
Dirt on the OPC surface → Clean the OPC and the machine, or replace the drum cartridge
When installing or removing the drum cartridge, a scratch was made → Replace the cartridge
Yes
No
Is it at a regular
interval of 95 mm?
Development roller defective → Replace the toner cartridge
Too much voltage supplied due to a setting error for the transfer voltage → Replace the HVPS
Yes
No
B174T911.WMF
Page 87
TROUBLESHOOTING
SM 4-21 B174
Trouble-
shooting
Trembling at the End When OHP Printing
Inserted more
than 10 films into
the MPF?
When multi-page OHP printng, less than 10 films are guaranteed. (Reduce the number of films and re-insert after paper check LED is off)
No
Yes
Yes
Recommended
OHP film used?
No
Use recommended film
Other parts touch the fan and prevent it from turning → Check and repair
When OHP
printing, does the fan
stop and start?
Yes
Use recommended film
B174T912.WMF
Page 88
TROUBLESHOOTING
B174 4-22 SM
Poor Fusing Grade
After printing
completed, any error
related to fusing?
The paper used is too thick or contains too much cotton → Re-test with recommended paper
Replace the fusing unit
Was the machine
stored in a very low
low temperature for
a long time?
No
Yes
Yes
Yes
No
Thermistor's
contact is OK?
Both ends
of the thermostat
open?
Place the machine at normal temperature and re-test
Replace the fusing unit
Replace the Main PBA
Replace the fusing unit
While printing,
the voltage at pin 60 of U36
(CPU) on the Main PBA is
2.1V - 2.6V?
Open the top
cover. When black printing,
is the fusing nip width
3.0 - 3.5 mm?
Yes
No
No
Yes
Yes
Yes
No
No
B174T913.WMF
Page 89
TROUBLESHOOTING
SM 4-23 B174
Trouble-
shooting
4.3.4 MALFUNCTION
Error
Status
Check Solution
No power
1. Check the supplied power
2. Check if fuse F1 on the SMPS is open
1. If the supplied power differs from machine’s power rating, replace the machine to the correct type for your area.
2. Replace SMPS.
Fuser Error
1. Thermostat open
2. AC wire open
3. Thermistor wire open
4. Main PBA
1. Detach the AC connector and measure the resistance between pin 1 and 2. If it is mega-ohm, the thermostat is open, Replace it.
2. Check if there is a bad connector contact or if the wire is cut.
3. Check the thermistor wire and its connection.
4. Replace the Main PBA
Cover open
1. When you close the side cover, check that the lever is pressed
2. Microswitch contact
3. CPU and related circuit
1. Open the side cover and press the lever with a pen. If the machine detects that the cover is closed, there is a mechanical problem with the side cover and lever assembly. If not, there is an electrical problem.
2. Check and replace the microswitch
3. Check and replace the main PBA
Jam 0 Check where Jam 0 occurs
1. Paper is not picked up
2. Paper is at the feed sensor
3. Occurred when inserting specific types of paper such as envelopes into the bypass tray?
4. Is the Stacker Extender folded out?
5. Does the guide bend the sheets?
1. Check whether the solenoid is working or not by using Engine test mode
2. Check for a feed sensor malfunction.
3. Re-try inserting fewer sheets.
• Fan the sheets and align them
• Take out the loaded sheets and insert
them in the reverse direction Take out the loaded sheets and insert them in the reverse direction
• Inserted sheets as recommended for
Manual Feeding?
• When loading, tap the sheets until the
paper sensor detects them in the tray
4. When using long paper, use the Stacker Extender
5. Adjust the guide to fit the paper width
Page 90
TROUBLESHOOTING
B174 4-24 SM
Error
Status
Check Solution
Jam 1
Paper is stopped just after the fusing unit.
1. It is mostly caused by double feeding. Check that paper is stocked correctly in the feeder.
2. Check the feed actuator position and actuator’s operation. There may be stiff moving or double reflection. If not, check the operation of the feed sensor with Engine test mode.
3. Check the exit lever operation. Remove the jam and check the actuator motion by hand. If the actuator is too stiff, paper is wrapped around the heat roller. Remove obstacles or replace.
Jam 2 Check where Jam 2 occurs
1. Paper is curled and cannot exit.
2. Paper is curled in the exit cover.
1. Remove paper and check if the hot roller strippers are defective. Clean the fusing unit.
2. Check that the lock works well. Watch whether the ribs of the exit cover have a burr or resistive edge. If they do, remove obstacles or replace.
Jam 2 at face-down tray
1. The paper is not drawn in because of the stack of papers in the exit tray.
2. Does it curl while coming out?
1. Load the recommended quantity of paper
2. Open the Front Cover and check whether a roller or spring, which is related to paper exit, is not out of position. If so, re-
locate or replace
.
Clutch error
1. Check the spring of the solenoid
2. Check the armature assembly/cushion
3. Electrical check
1. Check whether the spring is stretched or not.
2. Check that the armature is correctly installed.
3. Remove the Main PBA.
High voltage error
1. Check the terminal output voltage
2. Check HVPS
1. Remove the toner cartridge and open the cover. Then press the cover open switch lever and measure the voltage with a high voltage probe, and send a print job. If the voltage is normal, change the toner cartridge.
2. Disassemble and check output voltage of
the HVPS and replace it.
Feeding obstacles
Does the plate-knock up prevent the paper loading?
MP Tray: Turn the power off and on. Open and close the side cover to return to the original state.
Cassette : Adjust the guide to fit the paper width.
Skew
Is the guide set to the paper width?
Adjust the guide to fit the paper width
Page 91
TROUBLESHOOTING
SM 4-25 B174
Trouble-
shooting
Error
Status
Check Solution
Stacking
1. Did the user take out the stacker extender to support long paper?
2. Stacked more paper than the stacker can hold?
1. Use the extender for long paper
2. The face-up stacker normally can hold 100 pages when using 75 g/m
2
paper. But, stacking capacity can be lower for some types of paper.
Engine Error
Check Harness_CN7. (Main PBA to LSU)
Refer to the troubleshooting flow chart “ENGINE ERROR”.
Document is not picked up (in the ADF).
1. Check that documents are correctly stacked in the ADF.
2. Check whether documents were fastened together with staples or clips.
3. Load the recommended quantity of paper.
Document is stopped after it has fed into the ADF.
1. Check whether the REG sensor is working or not.
2. Check whether the Feed Roller is working or not.
Document Jam
Does it curl while coming out?
1. Check if the ADF Upper Cover is closed properly.
2. Check that the ADF ass'y is assembled correctly.
Page 92
TROUBLESHOOTING
B174 4-26 SM
No Power (LCD NO display LED Off)
Replace the OPE ass'y
Is the
power cord plugged
in?
Yes
No
The voltage supply is the same as the
rating?
LEDs blink
once when powered
on?
The fan
turns when powered
on?
Yes
Yes
Yes
Short
between 5V and GND, or
between 24V and
GND?
Short on
the OPE panel
board?
Connection error between Main board and panel board or malfunction of boards. → Replace the boards
Fuse of SMPS
is open?
Connections
on the boards are
OK?
Toner cartridge
is installed?
Remove the short or replace the SMPS
Put in the cartridge
Detection failure because of a defective board which detects side cover open or a defective switch → Replace the board or switch
Check the voltage, then plug in the power cord
Supply the same power as the rating
Re-connect firmly and re-test
Replace the SMPS
No
No No
NoNo
Yes
Yes
No
Yes
Yes
Yes
No No
Yes
B174T914.WMF
Page 93
TROUBLESHOOTING
SM 4-27 B174
Trouble-
shooting
Fuser Error
A
C is being
supplied?
Thermostat is open
→
Replace the fusing unit
No
Yes
Yes
Less than 10W?
No
No
Re-install the top cover and close it
Thermistor, connection point or Main board defect
→
Replace the component/
board
Measure the resistance at the both ends of the AC Line with covers open
Remove the covers
END
The voltage at pin #6 of U5 on the Main PBA is about
3.2V? If not check CN4 on the power board.
The voltage at
pin #60 of U36 (CPU) on the
Main PBA is about 2.65 V
when printing?
Yes
Yes
B174T915.WMF
Page 94
TROUBLESHOOTING
B174 4-28 SM
Paper Jam (Mis-Feeding)
Switch them
Does the
solenoid go on at
start of print?
Yes
No
Does the
paper move?
Feeder
sensors assembled
in reverse?
Does the
paper move more
than 100mm?
Yes
Yes
Too many
sheets in the
feeder?
Take out the paper and re-insert
Main PBA board defective → Replace Solenoid defective → Replace
The pick-up unit is assembled wrong → Re-assemble or replace the unit
Reduce the amount and re-test
No
No
No
Yes
The sensor and main PBA defective → Replace
Paper end curled?
Is the extender
pulled out?
Pull out the extender
<Recommendation> Use the bypass tray (MP Feeder) for the thick paper such as envelopes and cardstock
Use recommended paper
Paper guides
fit the paper width?
No
Yes
No No
Yes
Yes
Yes
B174T916.WMF
Page 95
TROUBLESHOOTING
SM 4-29 B174
Trouble-
shooting
Paper Jam (Jam 1)
Remove the fuser, remove the paper and replace the fusing unit, if necessary
Adjust the paper guides to fit the paper width
The force of the springs pressing the toner cartridge is too weak → Check the set condition of the toner cartridge.
Paper
stopped before
the fuser?
Use recommended paper
The
actuator of the paper
exit sensor works
OK?
Yes
No
Is the paper rolled
around the presseure
roller?
Severe skew
when feeding?
Check the LSU for a defect → Replace it
Check if the actuator exists and its operation, and around the main PBA → Replace
Check that the rollers and ribs of the fuser are in place, and remove burrs, if any → Remove the causes of jams
Yes
No
Yes
Yes
Paper
stopped before
the OPC?
Feeds
multiple pages?
Remove any defective parts
The paper
came out
between fuser and
toner cartridge?
Check the input path to the fuser (such as mis-assembly)
Check if the transfer guide is grounded. Check if the shutter prevents feeding.
Yes
Yes
Yes
No No
No No
No
Yes
Paper is too thin
or sensitive to
static electricity?
B174T917.WMF
Page 96
TROUBLESHOOTING
B174 4-30 SM
Engine Error
Replace the LSU
Check
Harness-CN7
(Main PBA to
LSU)
Yes
No
Yes
Yes
No
No
No
Yes
Try again to connect or
replace the connector
Replace the Main PBA
Replace the LSU
Replace the Main PBA
END
Check Main PBA CN7-9, P_MOTOR Signal
( )
Check
Main PBA CN7-8,
LREADY Signal
( )
Check
Main PBA CN7-4,
LDON Signal
( )
Check
Main PBA CN7-1,
HSYNC Signal
( )
No
Yes
B174T918.WMF
Page 97
TROUBLESHOOTING
SM 4-31 B174
Trouble-
shooting
4.3.5 TONER CARTRIDGE AND DRUM CARTRIDGE SERVICE
Precautions on Safe-keeping of the Drum Cartridge
Excessive exposure to direct light for more than a few minutes may cause damage to the cartridge.
Service for the Life of Toner Cartridge
If the printed image is light due to the life of the toner cartridge, you can temporarily improve the print quality by redistributing the toner (shake the toner cartridge). But, you should replace the toner cartridge to solve the problem completely.
Page 98
TROUBLESHOOTING
B174 4-32 SM
Symptoms of a defective toner cartridge
Fault Signs Cause & Check Solution
1. If the printed image is light or dirty and untidy– Shake the toner cartridge and then recheck.
1) NG: Check the weight of the toner cartridge
2) OK: Lack of toner, so the life is nearly ended.
1. For symptoms 1, 2, and 3 If it becomes better after shaking, replace with a new toner cartridge after 50-100 sheets if the life of the cartridge is almost ended.
2. Some part of image is not printed - Shake the toner cartridge and then recheck.
1) NG: Check the weight of the toner cartridge and clean the LSU window with a cotton swab, then recheck.
2) OK: Lack of toner, so the life is nearly ended.
2. If it becomes better after cleaning the LSU window, then the toner cartridge is normal. (Because of a foreign substance on the LSU window, part of the image was not printed.)
3. Periodically a "tick tick" noise occurs - Measure the cycle and the weight of the toner cartridge.
3. If the cycle of the noise is about 2 seconds, the toner inside the toner cartridge has almost ended. (Install a new toner cartridge after making about 200 more sheets)
Light image and partially blank image
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T923.WMF
• The printed
image is light or dirty and untidy.
• Some part of
the image is not printed.
• Periodically a
"tick tick" noise occurs.
4. White vertical stripes on the whole image or part of the image : Check the weight of the toner cartridge.
4. This is caused by lack of toner, so replace with a new toner cartridge.
1. Toner falls on the paper periodically.
1) Check the cycle of occurrence.
Check the appearance of both ends of the OPC drum.
1. If both ends of the OPC drum are contaminated with toner: Replace the toner cartridge if it is near the end of its life.
Toner contami­nation
• Toner falls on
the paper periodically.
• Contaminated
with toner on prints partly or over the whole surface.
2. The center of the printed matter is contaminated with toner.
1) Check whether foreign
substances or toner are stuck to the terminal (contact point) of the toner cartridge.
2) Check whether the state
of the terminal assembly is normal.
2. Is the customer using recycled toner?
Page 99
TROUBLESHOOTING
SM 4-33 B174
Trouble-
shooting
Fault Signs Cause & Check Solution
1. If light or dark periodical black dots occur, this is because the rollers are contaminated with a foreign substance or paper particles.
1) 37.7 mm interval : Charge roller
2) 94.3 mm interval : OPC drum
1. Run OPC Cleaning Mode Print (User Tools – 12. Maintenance – Clean Drum) 4-5 times repeatedly to remove. Especially check for foreign substances on the OPC surface, then remove them with a clean gauze moistened with Isopropyl Alcohol if necessary.
Caution: Never use normal
(ethyl) alcohol.
White Black spot
Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer
B174T927.WMF
• Light or
dark black dots on the image occur periodically.
• White spots
occur in the image periodically.
2. If white spots occur in a black image at intervals of 94.3 mm, or black spots occur elsewhere, the OPC drum is damaged or a foreign substance is stuck to the surface.
2. If they do not disappear after you run
OPC
Cleaning Mode Print (User Tools – 12. Maintenance – Clean Drum) 4-5 times. : at intervals of 94.3mm ­Replace the OPC Drum. : at intervals of 37.7mm ­Remove the foreign substance, Clean the Charge Roller : Broken image - Replace the toner cartridge.
1. Poor appearance of the toner cartridge.
1) Check if there is the damage to the label and if different materials are used.
2) Check the appearance of parts of the toner cartridge, such as
frame, hopper
.
1.
1) Look for evidence of disassembling the toner cartridge.
2) Check if materials other than normal parts of the toner cartridge are added or substituted.
Recycled product
• Poor
appearance of the toner cartridge.
• Dirty and
rough printouts.
• Bad
background in the image.
2. Dirty and rough printouts.
1) Check whether foreign substances or toner are stuck to the terminal (contact point) of the toner cartridge.
2) Check whether the state of the terminal assembly is normal.
2. If the toner cartridge appears to be disassembled (see 1 above)
1) It occurs when the toner cartridge is recycled more than 2 times.
2) If toner that is nearly expired is collected to use, it is considered to be recycled.
Page 100
TROUBLESHOOTING
B174 4-34 SM
Fault Signs Cause & Check Solution
1. The printed image is too light or dark, or partially contaminated with black.
1) Check whether foreign
sub stance or toner are stuck to the terminal (point of contact) of the toner cartridge.
2) Check whether the
terminal assembly is normal.
1. All of 1, 2 above
1) Remove toner and foreign substances adhered to the contact point of the toner cartridge.
2) The contact point of the unit facing the contact point of the toner cartridge must also be cleaned.
3) If the terminal assembly is unsafe:
• Fully attach the
terminal or reassemble it after disassembling.
• Disassemble the
side plate and push the terminal to be attached, then reassemble it.
Ghost & Image Contamina­tion
• The printed
image is too light or dark, or partially contaminated with black.
• Totally
contaminated with black. (Black image printed out)
2. Totally contaminated with black. (Black image printed out)
1) Check whether foreign substances are stuck to the terminal (point of contact) of the toner cartridge and the state of assembly. (Especially check the charge roller terminal.)
2. The OPC drum is not electrically charged. Clean the terminals of the charge roller, then recheck it.
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