Oki MB280 Service Manual
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Oki MB280 Service Manual

Oki MB280 Service Manual

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MB280 / MB290
SERVICE MANUAL

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Summary of Contents for Oki MB280

  • Page 1 MB280 / MB290 SERVICE MANUAL...

  • Page 2: Table Of Contents

    PRINTER 3000 304 995 - 01 TABLE OF CONTENTS 1. DETAILED SECTION DESCRIPTIONS ........1-1 PRINTER MODEL-L1 1.1 COMPONENT LAYOUT ................1-1 1.1.1 MECHANICAL COMPONENTS ............1-1 1.2 PRINTING ....................1-2 1.2.1 PRINTING PROCESSES AROUND THE DRUM......1-2 1.2.2 CHARGE ..................1-3 （...
  • Page 3 PRINTER 3000 304 995 - 01 2.3.5 THERMISTOR................2-11 2.3.6 HOT ROLLER STRIPPERS............2-11 2.3.7 THERMOSTAT................2-12 2.4 PAPER FEED..................2-13 2.4.1 PAPER FEED ROLLER REMOVAL..........2-13 PRINTER MODEL-L1 2.4.2 REGISTRATION ROLLER............2-15 (ALSO KNOWN AS ‘ROLLER DRIVEN’ IN THE PARTS CATALOG) 2-15 2.5 OTHERS ....................

  • Page 4: Detailed Section Descriptions

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1. DETAILED SECTION DESCRIPTIONS 1.1 COMPONENT LAYOUT PRINTER MODEL-L1 1.1.1 MECHANICAL COMPONENTS （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D101.WMF Name Description Laser Unit Consists of the laser diode unit, cylindrical lens, f-theta lens, polygon mirror motor, and other laser optical components.

  • Page 5: Printing

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2 PRINTING 1.2.1 PRINTING PROCESSES AROUND THE DRUM PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D010.WMF This machine uses a “write to black” system, using negative toner. Charge: The charge brush roller [A] gives the OPC drum [B] surface a negative charge.

  • Page 6: Charge

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.2 CHARGE PRINTER MODEL-L1 （ ） G191 G182D102.WMF The OPC (Organic Photoconductor) drum [A] used in this machine is small in SERVICE MANUAL diameter. This allows a very compact design. A charge roller [B] charges the photoconductor.

  • Page 7: Laser Exposure

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.3 LASER EXPOSURE Overview PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D004.WMF Laser Unit Layout A : Laser Diode Unit F : Laser Synchronization Detector B : Polygon Mirror Motor G : Cylindrical Lens C : F-theta Lens H : Synchronization Detector Lens...

  • Page 8: Block Diagram

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Block Diagram Laser Diode Unit Engine Board PRINTER MODEL-L1 Regulator Laser Diode VIDEO Driver LDENA APCSH PGSYCI （ ） G191 +24VD Polygon Mirror PMENA Motor Unit Interlock Switch PMCLK Laser Diode PMLOK SERVICE MANUAL...

  • Page 9: Development

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.4 DEVELOPMENT Overview PRINTER MODEL-L1 （ ） G191 G182D103.WM F SERVICE MANUAL This machine uses mono-component toner, which is composed of resin and ferrite. The toner mixing bar [A] stirs and carries toner to the toner application roller [B]. TECHNICAL DOCUMENT The toner application roller supplies toner to the development roller [C].
  • Page 10 PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D005.WMF The voltage to the development roller and the toner application roller is supplied through the terminals ([A] for the development roller and [B] for the toner application roller) from the Power Supply Unit board.

  • Page 11: Toner End Detection

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Toner End Detection This machine does not have toner end detection. PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT...

  • Page 12: Transfer And Separation

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.5 TRANSFER AND SEPARATION Overview PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL G182D104.WMF This machine uses a transfer roller [A], which touches the OPC drum [B] surface. A constant current is applied to the transfer roller from the power supply unit board TECHNICAL DOCUMENT [C].

  • Page 13: Drum Cleaning

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.6 DRUM CLEANING PRINTER MODEL-L1 （ ） G191 G182D102.WMF SERVICE MANUAL The cleaning blade and the used toner tank are contained in the toner cartridge. The Discharge Lamp and A counter blade system is used for drum cleaning. The Discharge Lamp[C] discharge the drum surface.

  • Page 14: Paper Feed And Registration

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.7 PAPER FEED AND REGISTRATION Overview PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL G182D105.WMF Paper Feed System: Feed roller [A] and Friction pad [B] Paper Lift Mechanism: Bottom plate with spring [C] TECHNICAL DOCUMENT Sheet feeder 1 sheet feeder [D]...

  • Page 15: Paper Feed Drive Mechanism

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Paper Feed Drive Mechanism PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D006.WMF The feed roller [A] is located above the upper tray bottom plate [B], and the friction pad [C].

  • Page 16: Paper Feed Operation

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Paper Feed Operation PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL G182D007.WMF TECHNICAL DOCUMENT A : Paper feed drive gear D : Friction pad B : Paper feed clutch E : Paper feed sensor C : Paper feed roller F : Registration sensor The paper feed drive gear [A] always rotates while the main motor rotates, since...

  • Page 17: Registration

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Registration PRINTER MODEL-L1 （ ） G191 G182D107.WMF SERVICE MANUAL The registration sensor [A] detects the leading edge of the paper and synchronizes paper feed with the writing of the image on the drum, so that the image and paper match up properly.

  • Page 18: Paper End Detection

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Paper End Detection PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D008.WMF The laser unit [A] has the paper end sensor [B] built into it. The paper end sensor detects the presence or absence of paper.

  • Page 19: Jam Detection

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Jam Detection Jam 1. Paper jam at the paper cassette When the registration sensor does not turn on within 2.52 seconds after the paper PRINTER MODEL-L1 pick-up clutch for the paper cassette turns on. Jam 2.

  • Page 20: Fusing

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.8 FUSING Overview PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL G182D106 WMF After the image is transferred, the copy paper enters the fusing unit. The image is TECHNICAL DOCUMENT fused to the copy paper by applying heat and pressure through the use of a hot roller [A] and pressure roller [B].

  • Page 21: Power Save Control

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 Power Save Control When the main switch is turned on, the machine turns on the fusing lamp. For printing, the machine raises the fusing temperature to 175°C. The fusing PRINTER MODEL-L1 temperature is kept at 175°C during printing.

  • Page 22: Cover Switch

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.9 COVER SWITCH When the front door is opened, the interlock switch will be opened and power supply to the following parts will be cut. G182D014.JPG • Power pack •...

  • Page 23: Paper Feed Drive Release And Fusing Drive Release

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.10 PAPER FEED DRIVE RELEASE AND FUSING DRIVE RELEASE PRINTER MODEL-L1 （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT G182D009.WMF The main motor drives the paper feed unit, the transfer roller, the toner cassette, and fusing unit through a series of gears as follows.

  • Page 24: Replacement And Adjustment

    PRINTER 3000 304 995 - 01 エラー! スタイルが定義されていません。 6 September 2005 1.2.10 PAPER FEED DRIVE RELEASE AND FUSING DRIVE 2. REPLACEMENT AND ADJUSTMENT RELEASE The following table shows the part replacement rank, which explains the difficulty of each replacement procedure. PRINTER MODEL-L1 Definition: A: Replacement in the field cannot be recommended.

  • Page 25: Paper Cassette

    PRINTER 3000 304 995 - 01 2.1 PAPER CASSETTE 2.1.1 PAPER CASSETTE PRINTER MODEL-L1 [A]: Paper cassette （ ） G191 SERVICE MANUAL G182R001.JPG Side Fence [B]: Side fence gear (pull it out) TECHNICAL DOCUMENT G182R002.JPG [C]: Side fence – Left Unhook at the rear.

  • Page 26: Bottom Plate

    PRINTER 3000 304 995 - 01 Bottom Plate [E]: Bottom plate Unhook at both sides of the cassette [F]. PRINTER MODEL-L1 Detach from the pin [G] at both sides. （ ） G191 G182R004.JPG SERVICE MANUAL TECHNICAL DOCUMENT G182R005.JPG Friction Pad [H]: Friction pad (two hooks) NOTE: Be careful not to lose the spring [I].

  • Page 27: Laser Unit

    PRINTER 3000 304 995 - 01 2.2 LASER UNIT WARNING FOR THE LASER UNIT This machine contains a laser beam generator. Laser beams can cause PRINTER MODEL-L1 permanent eye damage. Do not open the laser unit or look along the laser beam path while the main power is on.
  • Page 28 PRINTER 3000 304 995 - 01 Warning Label [F] CAUTION VORSICHT CATION-CLASS 3B LASER RADIATION WHEN OPEN AVOID EXPOSURE TO THE BEAM VORSICHT-LASERSTRAHLUNG KLASSE 3B WENN ABDECKUNG GEOFFNET PRINTER MODEL-L1 NICHT DEM STRAHL AUSSETZEN >PS< 3BLASERCAUTION.WMF G191 （ ） SERVICE MANUAL TECHNICAL DOCUMENT...

  • Page 29: Fusing Area

    PRINTER 3000 304 995 - 01 2.3 FUSING AREA CAUTION VORSICHT CATION-CLASS 3B LASER RADIATION 2.3.1 FUSING UNIT WHEN OPEN AVOID EXPOSURE TO THE BEAM VORSICHT-LASERSTRAHLUNG KLASSE 3B WENN ABDECKUNG GEOFFNET NICHT DEM STRAHL AUSSETZEN Preparation: PRINTER MODEL-L1 >PS< 1) Remove the upper unit. (See Upper Unit Removal.) 3BLASERCAUTION.WMF （...

  • Page 30: Paper Exit Assembly

    PRINTER 3000 304 995 - 01 2.3.2 PAPER EXIT ASSEMBLY [A]: Fusing cover (1 screw) PRINTER MODEL-L1 （ ） G191 G182R010.JPG [B]: Paper exit assembly (2 screws [circled SERVICE MANUAL in blue in the lower diagram]) TECHNICAL DOCUMENT G182R012.JPG G182R011.JPG...

  • Page 31: Fusing Lamp And Hot Roller

    PRINTER 3000 304 995 - 01 2.3.3 FUSING LAMP AND HOT ROLLER Preparation: • Remove the paper exit assembly (* 2.3.2). PRINTER MODEL-L1 Fusing Lamp [A]: Fusing lamp (2 screws) （ ） G191 SERVICE MANUAL G182R013.JPG TECHNICAL DOCUMENT G182R014.JPG G182R015.JPG NOTE: Do not touch the surface of the fusing lamp with bare hands.

  • Page 32: Hot Roller

    PRINTER 3000 304 995 - 01 Hot Roller [A]: Electrode (1 screw) PRINTER MODEL-L1 （ ） G191 G182R019.JPG [B]: Hot roller (pull it out) SERVICE MANUAL NOTE: Do not touch the surface of the hot roller with bare hands. TECHNICAL DOCUMENT G182R020.JPG NOTE: When re-assembling, be careful not to damage the hot roller strippers [C].

  • Page 33: Pressure Roller

    PRINTER 3000 304 995 - 01 2.3.4 PRESSURE ROLLER Preparation: • Remove the paper exit assembly (* PRINTER MODEL-L1 2.3.2). • Remove the fusing lamp and hot roller (* 2.3.3). [A]: Pressure roller (1 bushing [B] and 1 （ ） spring [C] at each side) G191 G182R046.JPG...

  • Page 34: Thermistor

    PRINTER 3000 304 995 - 01 2.3.5 THERMISTOR Preparation: • Remove the paper exit assembly (* 2.3.2). PRINTER MODEL-L1 [A]: Thermistor (1 screw) NOTE: When reassembling, do not damage the thermistor, and check that the element touches the hot （ ）...

  • Page 35: Thermostat

    PRINTER 3000 304 995 - 01 2.3.7 THERMOSTAT Preparation: • Remove the paper exit assembly (* 2.3.2). PRINTER MODEL-L1 • Remove the fusing lamp and hot roller (* 2.3.3). [A]: Thermostat (2 screws) （ ） G191 SERVICE MANUAL G182R024.JPG TECHNICAL DOCUMENT G182R025.JPG 2-12...

  • Page 36: Paper Feed

    PRINTER 3000 304 995 - 01 2.4 PAPER FEED 2.4.1 PAPER FEED ROLLER REMOVAL Preparation: PRINTER MODEL-L1 PRINTER MODEL-L1 1) Remove the upper unit. (See Upper Unit Removal.) [A]: Drive assembly (4 screws) （ （ ） ） G191 G191 SERVICE MANUAL SERVICE MANUAL G182R026.JPG [B]: Electromagnetic...
  • Page 37 PRINTER 3000 304 995 - 01 Remove the paper feed roller [C] from the shaft. PRINTER MODEL-L1 G182R031.JPG （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT 2-14...

  • Page 38: Registration Roller

    PRINTER 3000 304 995 - 01 2.4.2 REGISTRATION ROLLER (ALSO KNOWN AS ‘ROLLER DRIVEN’ IN THE PARTS CATALOG) PRINTER MODEL-L1 Preparation: 1) Remove the upper unit. (See Upper Unit Removal) 2) Remove the paper tray 3) Remove the toner cartridge （...

  • Page 39: Others

    PRINTER 3000 304 995 - 01 2.5 OTHERS 2.5.1 TRANSFER ROLLER PRINTER MODEL-L1 Preparation: 1) Remove the upper unit. (See Upper Unit Removal.) 2) Remove the toner cartridge. （ ） G191 [A]: Transfer roller [B]: Black bushing SERVICE MANUAL G182R036.JPG TECHNICAL DOCUMENT G182R035.JPG Remove the transfer roller with a flat-head (-) screwdriver.

  • Page 40: Fan Motor

    PRINTER 3000 304 995 - 01 2.5.3 MAIN MOTOR REMOVAL 2.5.2 FAN MOTOR Preparation: Preparation: 1) Remove the upper unit. (See Upper Unit Removal.) 1) Remove the upper unit. (See Upper Unit Removal.) PRINTER MODEL-L1 2) Remove the paper tray. 3) Remove the toner cartridge.
  • Page 41 PRINTER 3000 304 995 - 01 2.5.3 MAIN MOTOR REMOVAL Preparation: 1) Remove the upper unit. (See Upper Unit Removal.) PRINTER MODEL-L1 2) Remove the paper tray. 3) Remove the toner cartridge. 4) Remove the laser unit (* 2.2). [A]: Paper tray guides (2 screws) [B]: Left shield (13 screws &...

  • Page 42: Discharge Lamp Assy

    PRINTER 3000 304 995 - 01 2.5.4 DISCHARGE LAMP-ASS’Y REMOVAL Preparation: 1) Remove Fusing unit. (See Upper Unit Removal). PRINTER MODEL-L1 [A]: Ground Wire-Bracket-Discharge Lamp (1 screws) [B]: Harness-Discharge Lamp [C]: Discharge Lamp Assy (2 screws) （ ） G191 SERVICE MANUAL TECHNICAL DOCUMENT 2-19...

  • Page 43: Psu (Known As 'Power Supply Unit' In The Parts Catalog)

    PRINTER 3000 304 995 - 01 2.6PSU (KNOWN AS ‘POWER SUPPLY UNIT’ IN THE PARTS CATALOG) 2.6.1PSU REMOVAL Preparation 1) Remove the upper unit. (See Upper Unit Removal.) 2) Remove the paper tray. 3) Remove the toner cartridge. 4) Remove the right & left shield (* 2.5.3). [A]: PSU (9 screws &...

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Mb290

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