Ricoh AC204 Service Manual

SERVICE DOCUMENTATION

RICOH GROUP COMPANIES

B174

001955MIU

SERVICE DOCUMENTATION

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®

B174

RICOH GROUP COMPANIES

B174

SERVICE

DOCUMENTATION

001955MIU

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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.

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.

 2004 RICOH Corporation. All rights reserved.

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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

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

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

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

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.

INSTALLATION

PREVENTIVE MAINTENANCE

REPLACEMENT AND ADJUSTMENT

TROUBLESHOOTING

TAB

POSITION 1

TAB

POSITION 2

TAB

POSITION 3

TAB

POSITION 4

SERVICE TABLES

DETAILED DESCRIPTIONS

SPECIFICATIONS

APPENDIX

TAB

POSITION 5

TAB

POSITION 6

TAB

POSITION 7

TAB

POSITION 8

INSTALLATION

INSTALLATION

1. INSTALLATION

Refer to the operating instructions.

Installation

SM 1-1 B174

PREVENTIVE MAINTENANCE

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

Scanner

Printer

ADF Rubber Pad Ass’y 20,000 Pages Service
ADF Pick-up Ass’y 50,000 Pages Service
Rubber - Paper Pick-up - Right
Rubber - Paper Pick-up - Left
Transfer Roller 75,000 Pages Service
Fuser 75,000 Pages Service

75,000 Pages Service

Preventive

Maintenance

SM 2-1 B174

REPLACEMENT AND ADJUSTMENT

GENERAL PRECAUTIONS ON DISASSEMBLY

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.

Adjustment

Replacement

B174R979.WMF

SM 3-1 B174

REAR COVER

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]

B174 3-2 SM

SCANNER ASS'Y

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.

[B]

[A]

B174R902.WMF

Adjustment

Replacement

4. Open the Right Cover assembly [C]
first to open the Front Cover [D].

• Close the front cover first when you
assemble the machine.

B174R903.WMF

[C]

2

1

[D]

B174R904.WMF

SM 3-3 B174

SCANNER ASS'Y

5. Remove two screws.

B174R905.WMF

6. Pull up the Scanner Ass'y [A] in the
direction of the arrow.

[A]

7. Disconnect the connector [B] from the
Platen Ass'y.

B174R906.WMF

[B]

B174R907.WMF

B174 3-4 SM

SCANNER ASS'Y

[A]

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).

[B]

B174R909.WMF

B174R908.WMF

Adjustment

Replacement

B174R978.WMF

SM 3-5 B174

SCANNER ASS'Y

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.

[A]

[B]

B174R910.WMF

13. Remove the Dummy Upper Ass’y [D]
( x 2).

B174R911.WMF

[C]

[D]

B174R912.WMF

B174 3-6 SM

SCANNER ASS'Y

14. Remove the Channel Base Frame [A]
( x 4).

[A]

15. Remove the Dummy Scan-Lower [B]
( x 5).

B174R913.WMF

Adjustment

Replacement

16. Remove the CCD cable [C].

[B]

B174R914.WMF

[C]

B174R915.WMF

SM 3-7 B174

SCANNER ASS'Y

17. Pull up the Shaft CCD [A], and remove
the Scanner Unit [B].

18. Remove the Motor Bracket [C] ( x 3).

[B]

[A]

B174R916.WMF

[C]

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].

[D]

B174R917.WMF

[E]

B174R918.WMF

[F]

B174 3-8 SM

B174R919.WMF

ADF ASS'Y

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.

[A]

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.

[E]

[D]

[F]

[B]

[C]

B174R920.WMF

B174R921.WMF

Adjustment

Replacement

B174R922.WMF

SM 3-9 B174

ADF ASS'Y

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)

[A]

B174R923.WMF

7. Remove the ADF Motor ass'y [E]
( x 3).

[B]

[D]

[C]

B174R924.WMF

[E]

B174R925.WMF

B174 3-10 SM

OPE ASS'Y (ALSO KNOWN AS ‘OP-PORT’)

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).

[B]

[A]

3. Remove the contact rubbers [D] from
the unit.

[C]

[D]

B174R926.WMF

B174R927.WMF

Adjustment

Replacement

4. Remove the key pad [E] from the unit.

SM 3-11 B174

[E]

B174R928.WMF

RIGHT COVER ASS'Y

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 #.

[A]

[B]

B174R929.WMF

2

1

[C]

B174R930.WMF

B174 3-12 SM

RIGHT COVER ASS'Y

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

2

1

Adjustment

Replacement

B174R932.WMF

[A] [B]

SM 3-13 B174

RIGHT COVER ASS'Y

Duplex Ass'y

1. Remove the Duplex Ass'y [A] from the

[A]

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).

[B]

[B]

B174R933.WMF

B174R934.WMF

B174 3-14 SM

FUSER ASS'Y (ALSO KNOWN AS ‘FUSING UNIT’)

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).

[B]

Adjustment

Replacement

3. Disconnect one connector [C].

[A]

B174R935.WMF

[C]

B174R936.WMF

SM 3-15 B174

FUSER ASS'Y (ALSO KNOWN AS ‘FUSING UNIT’)

4. Remove the Fuser Ass'y [A] ( x 3).
(! 2)

[A]

B174R937.WMF

B174 3-16 SM

EXIT ASS'Y

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.

[A]

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

[C]

Adjustment

Replacement

SM 3-17 B174

[B]

B174R942.WMF

COPY TRAY

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).

[A]

B174R943.WMF

B174 3-18 SM

DRIVE ASS'Y

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)

[B]

[A]

3. Remove the Fan [C] and Duct - Fan
[D] ( x 1).

4. Remove the Drive Ass'y [E] ( x 5).

B174R944.WMF

B174R945.WMF

Adjustment

Replacement

[C]

[D]

[E]

B174R946.WMF

SM 3-19 B174

SMPS & HVPS (ALSO KNOWN AS ‘PSU’ AND ‘POWER PACK)

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.

[A]

B174R947.WMF

B174R948.WMF

4. Remove the SMPS & HVPS [B].

[B]

B174R949.WMF

B174 3-20 SM

LSU (LASER SCANNING UNIT)

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.

B174R950.WMF

Adjustment

Replacement

3. Remove the LSU [A] ( x 3).

[A]

B174R951.WMF

SM 3-21 B174

LEFT COVER

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).

[A]

3. Remove the Left Cover [B] ( x 1).

[B]

B174R952.WMF

B174R953.WMF

B174 3-22 SM

MAIN FRAME ASS'Y

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].

[A]

[C]

3. Remove the Deve Lock Lever [D].
Then remove the Cover Motor
Bracket [E] ( x 1).

[B]

B174R954.WMF

[E]

Adjustment

Replacement

[D]

SM 3-23 B174

B174R955.WMF

MAIN FRAME ASS'Y

4. Disconnect all the connectors.

B174R956.WMF

5. Remove the Main Frame Ass'y [A] (

[A]

x 7).

B174R957.WMF

B174 3-24 SM

MP ASS'Y (MULTI PURPOSE ASS’Y)

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.

Adjustment

Replacement

3. Remove the Feed Cover [A] ( x 1).

B174R958.WMF

B174R959.WMF

[A]

SM 3-25 B174

MP ASS'Y (MULTI PURPOSE ASS’Y)

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

[A]

B174R961.WMF

B174 3-26 SM

FEED ASS'Y

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

[A]

Adjustment

Replacement

B174R963.WMF

SM 3-27 B174

PICK UP ASS'Y

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

[A]

[C]

[B]

B174 3-28 SM

[D]

B174R966.WMF

MAIN BOARD

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).

[A]

3. Remove the Main Board [B] from the
Shield Plate ( x 5).

B174R967.WMF

[B]

Adjustment

Replacement

B174R968.WMF

NOTE: Do a memory clear after you replace the main board. If not, the system

possibly will not operate correctly. (! 5.2.4)

SM 3-29 B174

LIU BOARD

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].

[A]

[B]

B174R969.WMF

B174 3-30 SM

TROUBLESHOOTING

ERROR MESSAGES

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?

COMM. ERROR

The machine is waiting for the
programmed interval to
automatically redial.

A problem with fax communications
has occurred.

You can press START to
immediately redial, or
STOP to cancel the redial
operation.

Try again.

DOCUMENT JAM

DOOR OPEN

GROUP NOT
AVAILABLE

LINE ERROR

LOAD DOCUMENT

MEMORY FULL The memory is full.

NO ANSWER

A document has jammed in the
scanner document feeder

The side cover is not correctly
latched

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).

Your unit cannot connect with the
remote machine, or is disconnected
because of a problem on the phone
line.

You tried to set up a sending
operation with no document in the
feeder.

The remote machine did not
answer after all the redial attempts.

Remove the document jam.

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.

Try again. Check the
location for the group.

Usually caused by a
telephone line problem. Try
again. If failure continues,
wait an hour for the line to
clear then try again

Insert a document and try
again.

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.

Try again. Make sure the
remote machine is OK.

Trouble-

shooting

SM 4-1 B174

ERROR MESSAGES

Error Message Description Solution

NO. NOT ASSIGNED

NO PAPER
[ADD PAPER]

The speed dial location you tried to
use has no number stored in it.

There is no paper in the paper
cassette. Printing stops until paper
is loaded.

Dial the number manually
with the keypad, or store
the number.

Put paper in the paper
cassette.

OVERHEAT The printer has overheated.

PAPER JAM 0
OPEN/CLOSE DOOR

PAPER JAM 1/2
OPEN/CLOSE DOOR

TONER LOW

TONER EMPTY The toner cartridge is empty Replace the toner cartridge.

DRUM WARNING The OPC drum is almost at the end

Printing paper is jammed in paper
feeding area or the pick-up unit

Printing paper is jammed in the
machine main body or in the paper
exit unit.

The toner cartridge is almost
empty, or toner particles are not
equally applied in the cartridge

of its life (14,000 sides)

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.

Press STOP and remove
the jam.

Remove the jam.

Remove the toner cartridge
and carefully rock it from
side to side.

Try again. If problem
continues, replace the
cartridge.

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)

NO CARTRIDGE A toner cartridge is not installed. Install the cartridge.

BYPASS JAM Paper feed problem from the

bypass (Manual feed) Tray.

DUPLEX JAM Paper feed problem in the duplex

return path

LINE BUSY The remote fax didn’t answer Try again.

OPEN HEAT ERROR No power to the fusing lamp Check the thermostat,

B174 4-2 SM

Replace the OPC drum
cartridge.

Open the side cover and
remove the jam.

Release the output feed
lever and check the output
area. Also, open the side
door and check the duplex
unit.

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

ABNORMAL IMAGE PRINTING AND DEFECTIVE ROLLERS

Error Message Description Solution

Heating Error During operation, Temperature

does not go up

Scanner Locked Scanner head does not move. Check the transit lock.

Check the thermistor
contact point & the fusing
lamp.

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

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

6 Hot Roller 82.5 mm Black spot, White spot
7 Pressure Roller 78.5 mm Contamination on reverse side of paper

Abnormal

image period

Kind of abnormal image

Contamination on reverse side of paper /
transfer fault

Trouble-

shooting

SM 4-3 B174

TROUBLESHOOTING

4.3 TROUBLESHOOTING

4.3.1 SCANNER

COPY

Problem Items to be checked How to solve

White copy

Black copy

Defective image
quality

Abnormal noise

• Make sure that the scanner
cover is closed.

• Check the shading profile • Do the “Adjust Shading”

• Check the CCD problem in

Main PBA.

• Check shading profile. • Do the “Adjust Shading”

• Check shading profile. • Do the “Adjust Shading”

• Check the original is lying flat

on the scanner glass.

• Check the printing quality. • See “Print” troubleshooting.

• Check the scanner drive

mechanism.

• Check the Motor Driver chip on
the Main PBA.

• Room lighting can go through
thin paper. This causes quality
problems

procedure in Tech mode

• Check the CCD harness
contact.

procedure in Tech mode.

procedure in Tech mode

• A gap above 0.5 mm can
cause a blurred image.

• Check for mechanical
problems in the scanner
carriage, motor, gearbox, belt
and belt tension spring.

• Make sure that the scanner
motor position is correct.

• If a driver is defective, replace
the Main PBA.

B174 4-4 SM

TROUBLESHOOTING

PC-SCAN

Problem Items to be Checked. How to Solve

Scanning
Error

• Check the printer cable is correctly
installed.

• Use a standard IEEE1284
cable.

Defective
image Quality

• 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.

• 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.

• Check the gap between original and

scanner glass.

• A gap above 0.5 mm can
cause a blurred image.

Trouble-

shooting

Abnormal
noise

• Check the Scanner Motor and
mechanical problems in the scanner.

• Check the motor driver in the Main
PBA.

• Check for mechanical
problems in the scanner
carriage, motor, gearbox,
belt and belt tension spring.

• Make sure that the scanner
motor position is correct.

• If a driver is defective,
replace the Main PBA.

SM 4-5 B174

TROUBLESHOOTING

4.3.2 FAX

FAX/TELEPHONE PRECAUTIONS

Problem Items to be Checked. How to Solve

TEL LINE CANNOT
BE ENGAGED (NO
DIAL TONE)

Tone dial is not
possible

Tone dial is possible
but not pulse dial

Defective fax
transmission

Defective automatic
fax reception

• When you press the “OHD” key:
a) Check the line cord connection.
b) Check the MAIN LIU harness,

and CN1

c) Check the relay operation of the

LIU PBA: Is the control signal of
CN18 (main) low?

• Check CN18 (main PBA), MAIN-

LIU harness, and CN1 (LIU PBA)

• Check DP control signal of CN18-

11 of MAIN PBA and the circuit
around R15. U6 and Q2 of Liu
PBA.

• 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).

• Is the ring detected?

Check the ring signal at CN1-9
(LIU PBA).

• Refer to ‘“Defective

Transmission”.

(LIU PBA).

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.

• Replace defective parts.

• Replace the LIU 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.

• Replace the LIU PBA if it
cannot be checked.

• Refer to “Defective
Transmission”.

B174 4-6 SM

TROUBLESHOOTING

4.3.3 PRINT QUALITY

Error Status Check Solution

Vertical black line
and band

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

Vertical white line

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T921.WMF

No image

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T922.WMF

Light image

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T923.WMF

1. Faulty toner cartridge

2. LSU

1. Change the toner cartridge

2. Replace LSU

1. LSU window dirty

2. Toner cartridge

1. Clean the LSU window

2. If not the LSU, change the
toner cartridge.

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. 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. 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.

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.

Trouble-

shooting

SM 4-7 B174

TROUBLESHOOTING

Error Status Check Solution

Dark image

Digital Printer
Digital Printer

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)

Digital Printer
Digital Printer
Digital Printer

B174T924.WMF

Background

Digital Printer
Digital Printer

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.

Digital Printer
Digital Printer
Digital Printer

B174T925.WMF

Ghost

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

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.

B174T926.WMF

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

Partial blank image
(not periodic)

B174 4-8 SM

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. Toner is low?

2. The toner cartridge is out
of position?

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.

1. Replace the toner cartridge.

2. Check and adjust.

TROUBLESHOOTING

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

1. Replace the toner cartridge.

2. Replace the drum cartridge.

3. Replace the transfer roller.

particle. (58 mm)

Different image
density (left and
right)

B174T929.WMF

Horizontal band

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T928A.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

1. Unstable high voltage
contact

2. .Charge roller dirty

3. .Dirty hot roller

4. Malfunction of LSU

the machine

1. Clean each contact and
check good contact

2. Clean the charge roller.

3. Replace the fusing unit

4. Check the Main PBA

Trouble-

shooting

SM 4-9 B174

TROUBLESHOOTING

No Image

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T922.WMF

No Image?

Yes

Self testing

is possible ?

Yes Yes

Check connection to
computer or replace
main board

No

No No

Take out the cartridge and
prepare the tester for
electronic connection

Self test

pattern prints?

Is the OPC

terminal of machine

correctly connected

to the frame?

Yes

No

A on next

page

Retest after replacing the
connector or main board

Repair or replace the
GND terminal

Does the

video data line to

LSU change High/Low

when printing?

Yes

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

No

Check the path between
main board and HVPS.
Replace the defective
board

B174T901.WMF

B174 4-10 SM

TROUBLESHOOTING

A

Transfer

voltage OK? (on the

transfer roller

shaft)

Yes

Dev. roller

(-300V) and toner supply

(-450V) voltages

are OK?

Yes

No

No

Are the connection

terminal and connection

correct?

Yes

Replace the HVPS

Is the connection

terminal OK?

Yes

No

No

Repair or replace terminal

Repair or replace terminal

Trouble-

shooting

Is the toner

cartridge life expired (see

the counter)?

Yes

Replace the toner cartridge

No

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

B174T902.WMF

SM 4-11 B174

TROUBLESHOOTING

All Black

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T924.WMF

All black in

printing area?

Yes

Is charge

voltage supplied

from HVPS?

Yes

Is the Hsync/

signal received in

LSU?

Yes

The charge terminal
contact is bad
→ Replace the drum
cartridge

No

No

No

Does the

video data line to LSU

change High/Low when

printing?

Yes

Replace the LSU

Replace the HVPS

Replace the LSU

Check the path between
video controller, engine

No

board, HVPS, LSU for a
short or open circuit
→ Replace the defective
board or wiring

B174T903.WMF

B174 4-12 SM

TROUBLESHOOTING

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

White line missing

definitely?

Yes

No

Check

if the printout

has the same problem just

after it passed

the transfer roller

Yes

No

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

Trouble-

shooting

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

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

SM 4-13 B174

TROUBLESHOOTING

Dark Image

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T924.WMF

No

Dark selected via

Remote Control

Panel?

Yes

Change to Normal and test

Yes

Same at Normal?

Yes

Works correctly

with -300V of bias

voltage?

Yes

Works correctly

after replaced

LSU?

Yes

The power of the LSU is
too high or there is an
internal problem
→ Replace the LSU

No

No

No

END

Replace the defective
component

Toner over-supply due to
incorrect adjustment of metering
blade
→ Replace the toner cartridge

B174T905.WMF

B174 4-14 SM

TROUBLESHOOTING

Background

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T925.WMF

Replace HVPS
after checking
the terminals'
contacts

Recommended paper

used?

No

storage atmosphere is too

Solve the problem under
the recommended
operating condition
(10-32 degrees Centigrade)

Transfer,

charge and developing

voltage are OK?

Operating/

hot/humid?

Yes

Yes

Yes

No

Print 20 to 30 pages using
recommended paper

Yes

No

Same problem

occurs?

Dirt or

dust around the

charge roller?

Yes

Clean the charge roller or
replace the drum cartridge

No

No

END

Replace the
toner cartridge

Trouble-

shooting

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.

No

Works OK?

Yes

END

B174T906.WMF

SM 4-15 B174

TROUBLESHOOTING

Ghost

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

Digital Printer

B174T926.WMF

Replace the PTL
assembly

Check the HVPS
contacts and HVPS
output test mode
(see section 5-6)

→

If failed, replace

the HVPS

Replace the
HVPS

Is it at a regular

interval of 95mm?

No

(Quenching) lamp

No

Transfer voltage is

set to standard?

No

Bias voltage is OK?

Yes

PTL

works OK?

Yes

Yes

(-300V)

Yes

No

Is it at a regular

interval of 45mm?

Dev. roller/

supply roller voltages

(-300V/-450V)

Irregularity of the nip
between rollers in the toner
cartridge → Replace the
toner cartridge

OK?

Yes

Yes

No

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

No

Is it at a regular

interval

of 58 mm? (transfer

roller interval)

Yes

replace the terminal
contacts

Operating/

storage temperature is too

low or not recommended

paper used?

Yes

Use the machine with
recommended paper and
conditions

No

There may be a problem
with toner layer control in
the toner cartridge
→ Replace the toner
cartridge

B174T907.WMF

B174 4-16 SM

TROUBLESHOOTING

Black Spot

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T927.WMF

The problem

Is it a regular

interval of 38 mm?

Yes

No

When taking

out the cartridge,

toner leaks?

Yes

No

Bad image

removed by

scratching?

Yes

randomly occurred

No

due to falling toner
→ Clean the
machine

Foreign objetcs stuck
to the charge roller
→ Clean the charge
roller.

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

B174T908.WMF

Trouble-

shooting

SM 4-17 B174

TROUBLESHOOTING

Horizontal Band

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T928A.WMF

Black band?

The black

band has a regular

interval?

Yes

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T928B.WMF

No

No

Black band is

about 95mm from white

band?

Yes

Problem with internal
contacts in the OPC
→ Replace the drum
cartridge

No Hsync/ at the LSU
→ Replace the LSU

The OPC is damaged
under direct sunlight for

No

around 5 minutes
→ If the same problem
persists after 10 hours,
replace the drum cartridge

Yes

95 mm interval?

Yes

The OPC is damaged
due to incorrect transfer
voltage from the HVPS

→ Replace the HVPS
→ If the same problem

persists, replace the
drum cartridge

No

Every 83mm

at a specific

place?

Yes

Hot roller defective
→ Replace the fusing
unit

No

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

B174T909.WMF

B174 4-18 SM

TROUBLESHOOTING

Irregular Density

B174T929.WMF

OK after

taking out and rocking

the toner

cartridge?

Yes Yes

The guaranteed life of the
toner cartridge is over
(Check the counter and
replace it)

No

Clean the window of the
PTL

When

printing a gray pattern,

irregular density

persists?

PTL lamp

(Quenching lamp)

works OK?

Any dust

on the PTL lamp?

Yes

Yes

No No

Check the high voltage
output and repair/
replace terminals, HVPS

No

No

Light distortion due to a
defective mirror or
diffused reflection from
the LSU
→ Replace the LSU

Transfer/

charge/development

voltage drops while

printing?

Yes

Replace the lamp

Bad images

around no-image

areas?

Yes

Defective agitator
in the toner supply
mechanism
→ Replace the
toner cartridge

Irregular toner

No

supply
→ Replace the
toner cartridge

B174T910.WMF

Trouble-

shooting

SM 4-19 B174

TROUBLESHOOTING

White Spot

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T930.WMF

Is it at a regular

interval of 95 mm?

Yes

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

No

Transfer

voltage is normal?

Yes

Development roller defective
→ Replace the toner
cartridge

No

Too much voltage supplied
due to a setting error for the
transfer voltage
→ Replace the HVPS

B174T911.WMF

B174 4-20 SM

TROUBLESHOOTING

Trembling at the End When OHP Printing

Recommended

OHP film used?

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)

Yes

Yes

No

No

Use recommended film

When OHP

printing, does the fan

stop and start?

Yes

Other parts touch the fan
and prevent it from
turning
→ Check and repair

Use recommended film

B174T912.WMF

Trouble-

shooting

SM 4-21 B174

TROUBLESHOOTING

Poor Fusing Grade

After printing

completed, any error

related to fusing?

Yes

Both ends

of the thermostat

open?

Yes

Replace the fusing unit

Yes

Replace the Main PBA

No

Was the machine

stored in a very low

low temperature for

a long time?

Place the machine at

No

normal temperature and
re-test

No

Yes

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

Thermistor's

contact is OK?

Yes

Replace the fusing unit

Replace the fusing unit

No

Yes

The paper used is too
thick or contains too
much cotton
→ Re-test with
recommended paper

B174T913.WMF

B174 4-22 SM

TROUBLESHOOTING

4.3.4 MALFUNCTION

Error

Status

No power

1. Check the supplied
power

2. Check if fuse F1 on the
SMPS is open

Fuser Error

1. Thermostat open

2. AC wire open

3. Thermistor wire open

4. 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

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?

Check Solution

1. If the supplied power differs from
machine’s power rating, replace the
machine to the correct type for your
area.

2. Replace SMPS.

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

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

Trouble-

shooting

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

SM 4-23 B174

TROUBLESHOOTING

Error

Status

Jam 1

Jam 2 Check where Jam 2 occurs

Jam 2 at
face-down
tray

Paper is stopped just after
the fusing unit.

1. Paper is curled and
cannot exit.

2. Paper is curled in the exit
cover.

1. The paper is not drawn in
because of the stack of
papers in the exit tray.

2. Does it curl while coming
out?

Check Solution

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.

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.

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

High voltage
error

Feeding
obstacles

Skew

1. Check the spring of the
solenoid

2. Check the armature
assembly/cushion

3. Electrical check

1. Check the terminal output
voltage

2. Check HVPS

Does the plate-knock up
prevent the paper loading?

Is the guide set to the paper
width?

1. Check whether the spring is stretched or
not.

2. Check that the armature is correctly
installed.

3. Remove the Main PBA.

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.

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.

Adjust the guide to fit the paper width

B174 4-24 SM

TROUBLESHOOTING

Error

Status

Stacking

Engine Error

Document
Jam

Check Solution

1. Did the user take out the
stacker extender to
support long paper?

2. Stacked more paper than
the stacker can hold?

Check Harness_CN7. (Main
PBA to LSU)

Document is not picked up
(in the ADF).

Document is stopped after it
has fed into the ADF.

Does it curl while coming
out?

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.

Refer to the troubleshooting flow chart
“ENGINE ERROR”.

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.

1. Check whether the REG sensor is
working or not.

2. Check whether the Feed Roller is
working or not.

1. Check if the ADF Upper Cover is closed
properly.

2. Check that the ADF ass'y is assembled
correctly.

Trouble-

shooting

SM 4-25 B174

TROUBLESHOOTING

No Power (LCD NO display LED Off)

Is the

power cord plugged

in?

Yes

The
voltage supply is
the same as the

rating?

Yes

The fan

turns when powered

on?

Yes

LEDs blink

once when powered

on?

Yes

Yes

Short on

the OPE panel

board?

Yes

No

No

No No

No

Check the voltage, then
plug in the power cord

Supply the same power
as the rating

Connections

on the boards are

OK?

Yes

Fuse of SMPS

is open?

Yes

Short

between 5V and GND, or

between 24V and

GND?

Yes

NoNo

Re-connect firmly and
re-test

Replace the SMPS

No No

Toner cartridge

is installed?

Yes

Put in the
cartridge

Replace the OPE ass'y

Connection error
between Main board
and panel board
or malfunction of
boards.
→ Replace the boards

Remove the short
or replace the SMPS

Detection failure
because of a defective
board which detects
side cover open or a
defective switch
→ Replace the board
or switch

B174T914.WMF

B174 4-26 SM

TROUBLESHOOTING

A

Fuser Error

Measure the resistance
at the both ends of the AC
Line with covers open

Less than 10W?

Remove the covers

Yes

C is being

supplied?

Yes

The voltage at

pin #60 of U36 (CPU) on the

Main PBA is about 2.65 V

when printing?

Yes

No

Thermostat is open

→

Replace the fusing unit

The voltage at pin #6 of U5

No

Re-install the top
cover and close it

on the Main PBA is about

3.2V?
If not check CN4 on the
power board.

Trouble-

shooting

Thermistor, connection

No

point or Main board defect

→

Replace the component/

board

Yes

END

B174T915.WMF

SM 4-27 B174

TROUBLESHOOTING

Paper Jam (Mis-Feeding)

Does the

solenoid go on at

start of print?

Yes

Does the

paper move?

Yes

Does the

paper move more

than 100mm?

Yes

Feeder

sensors assembled

in reverse?

Yes

No

No

No

No

Main PBA board defective
→ Replace
Solenoid defective
→ Replace

The pick-up unit is
assembled wrong
→ Re-assemble or replace
the unit

The sensor and main
PBA defective
→ Replace

Too many

sheets in the

feeder?

Yes

Reduce the amount
and re-test

Switch them

Paper guides

fit the paper width?

Yes

Paper end curled?

Yes

Use recommended
paper

No

No No

Take out the paper
and re-insert

Is the extender

pulled out?

Yes

<Recommendation>
Use the bypass tray (MP Feeder)
for the thick paper such as
envelopes and cardstock

Pull out the
extender

B174T916.WMF

B174 4-28 SM

TROUBLESHOOTING

Paper Jam (Jam 1)

Paper

stopped before

the OPC?

Yes

Check the LSU for a
defect
→ Replace it

Paper

stopped before

the fuser?

Yes

Severe skew

when feeding?

Yes

No

Remove the fuser, remove
the paper and replace the
fusing unit, if necessary

No No

The

actuator of the paper

exit sensor works

OK?

Yes

Is the paper rolled

around the presseure

roller?

Yes

The paper

came out

between fuser and

toner cartridge?

Yes

No

No No

Check if the actuator exists
and its operation, and
around the main PBA
→ Replace

Feeds

multiple pages?

Yes

Remove any
defective parts

Check that the rollers
and ribs of the fuser are
in place, and remove
burrs, if any
→ Remove the causes
of jams

Check the input path
to the fuser (such as
mis-assembly)

Trouble-

shooting

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 is too thin

or sensitive to

static electricity?

Yes

Use recommended
paper

Check if the transfer

No

guide is grounded.
Check if the shutter
prevents feeding.

B174T917.WMF

SM 4-29 B174

TROUBLESHOOTING

Engine Error

Check

Harness-CN7

(Main PBA to

LSU)

Yes

Check
Main PBA CN7-9,
P_MOTOR Signal

( )

Yes

Check

Main PBA CN7-8,

LREADY Signal

( )

Yes

Check

Main PBA CN7-4,

LDON Signal

( )

Yes

No

No

No

No

Try again to connect or

replace the connector

Replace the Main PBA

Replace the LSU

Replace the Main PBA

Check

Main PBA CN7-1,

HSYNC Signal

( )

Yes

END

No

Replace the LSU

B174T918.WMF

B174 4-30 SM

TROUBLESHOOTING

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.

Trouble-

shooting

SM 4-31 B174

TROUBLESHOOTING

Symptoms of a defective toner cartridge

Fault Signs Cause & Check Solution

Light image
and partially
blank image

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T923.WMF

Toner
contami­nation

• The printed

image is light
or dirty and
untidy.

• Some part of

the image is
not printed.

• Periodically a

"tick tick"
noise occurs.

• Toner falls on

the paper
periodically.

• Contaminated

with toner on
prints partly or
over the
whole surface.

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.

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.

3. Periodically a "tick tick"
noise occurs - Measure
the cycle and the weight
of the toner cartridge.

4. White vertical stripes on
the whole image or part
of the image : Check the
weight of the 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.

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.

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. 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. 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)

4. This is caused by
lack of toner, so
replace with a new
toner cartridge.

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.

2. Is the customer using
recycled toner?

B174 4-32 SM

TROUBLESHOOTING

Fault Signs Cause & Check Solution

White Black
spot

Digital Printer
Digital Printer
Digital Printer
Digital Printer
Digital Printer

B174T927.WMF

Recycled
product

• Light or

dark black
dots on the
image
occur
periodically.

• White spots

occur in the
image
periodically.

• Poor

appearance
of the toner
cartridge.

• Dirty and

rough
printouts.

• Bad

background
in the
image.

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

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.

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

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.

.

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.

2. If they do not disappear
after you run
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.

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.

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.

OPC

Trouble-

shooting

SM 4-33 B174

TROUBLESHOOTING

Fault Signs Cause & Check Solution

Ghost &
Image
Contamina­tion

• The printed

image is too
light or dark,
or partially
contaminated
with black.

• Totally

contaminated
with black.
(Black image
printed out)

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.

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.)

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.

2. The OPC drum is not
electrically charged.
Clean the terminals of the
charge roller, then
recheck it.

B174 4-34 SM