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Oki MB280 Service Manual Download Page 7

PRINTER 3000 304 995 - 01 

i

PRINTER MODEL-L1 

（

G191

）

SERVICE MANUAL

TECHNICAL DOCUMENT

エラー

!

スタイルが定義されていません。

 

6 September 2005

 

1-4 

1.2.3 LASER EXPOSURE 

Overview

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 

D : First Mirror 

J : Shutter 

E : Second Mirror 

 

This machine uses a laser diode to produce an electrostatic latent image on the 
OPC drum. The laser diode unit converts image data into laser pulses, and the 
optical components direct these pulses to the OPC drum. 

As a mechanical safety feature, the shutter [J] closes to block the laser beam path 
whenever the front door is opened.  

G182D004.WMF

[A]

[B]

[C]

[D]

[E]

[F]

[G]

[H]

[J]

Summary of Contents for MB280

Page 1: ...MB280 MB290 SERVICE MANUAL ...

Page 2: ...g Mode 1 9 1 2 6 DRUM CLEANING 1 10 1 2 7 PAPER FEED AND REGISTRATION 1 11 Overview 1 11 Paper Feed Drive Mechanism 1 12 Paper Feed Operation 1 13 Registration 1 14 Paper End Detection 1 15 Jam Detection 1 16 1 2 8 FUSING 1 17 Overview 1 17 Power Save Control 1 18 1 2 9 COVER SWITCH 1 19 1 2 10 PAPER FEED DRIVE RELEASE AND FUSING DRIVE RELEASE 1 20 2 REPLACEMENT AND ADJUSTMENT 2 1 2 1 PAPER CASSET...

Page 3: ... 2 12 2 4 PAPER FEED 2 13 2 4 1 PAPER FEED ROLLER REMOVAL 2 13 2 4 2 REGISTRATION ROLLER 2 15 ALSO KNOWN AS ROLLER DRIVEN IN THE PARTS CATALOG 2 15 2 5 OTHERS 2 16 2 5 1 TRANSFER ROLLER 2 16 2 5 2 FAN MOTOR 2 17 2 5 3 MAIN MOTOR REMOVAL 2 18 2 5 4 DISCHARGE LAMP ASSY 2 19 2 6 PSU KNOWN AS POWER SUPPLY UNIT IN THE PARTS CATALOG 2 20 2 6 1 PSU REMOVAL 2 20 ...

Page 4: ... application roller development roller charge brush roller cleaning blade and other development components C Upper Tray Bottom Plate Presses paper stacked in the upper paper tray against the paper feed roller D Paper Feed Roller Picks up the top sheet of paper from the stack in the upper paper tray and feeds it into the transfer area E Transfer Roller Applies a charge to the paper to pull the tone...

Page 5: ...on the drum The following charges are applied Development bias during printing Toner application roller E Development roller D Switching bias At the start and the end of any print process Toner application roller E Development roller D Image Transfer The transfer roller F pulls the toner from the drum onto the paper G Paper Separation The antistatic brush H removes the charge on the underside of t...

Page 6: ...ameter This allows a very compact design A charge roller B charges the photoconductor The charge roller has the advantage of not generating ozone A large negative voltage is applied from the Power Supply Unit board to the charge roller This charge roller gives the OPC drum surface a negative charge The voltage to the charge roller is supplied through the terminal C from the Power Supply Unit board...

Page 7: ...rical Lens C F theta Lens H Synchronization Detector Lens D First Mirror J Shutter E Second Mirror This machine uses a laser diode to produce an electrostatic latent image on the OPC drum The laser diode unit converts image data into laser pulses and the optical components direct these pulses to the OPC drum As a mechanical safety feature the shutter J closes to block the laser beam path whenever ...

Page 8: ...milliseconds after the LDENA signal is sent It detects a laser error if the pulse count does not reach the specified number within 400 milliseconds When this occurs the machine warns the customer on the LCD panel Error 56 Polygon Mirror Motor Error The machine detects a polygon mirror motor error when the PMLOK signal does not go low within 3 5 seconds of the PMENA signal When this occurs the mach...

Page 9: ... roller C As the development roller turns past the toner metering blade D only a thin coating of negatively charged toner particles stays adhered to the development roller During printing a bias voltage is applied to the toner application roller and another bias voltage is applied to the development roller The toner is transferred from the toner application roller to the development roller by the ...

Page 10: ...6 September 2005 エラー スタイルが定義されていません 1 7 Detailed Descriptions 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 G182D005 WMF A B ...

Page 11: ...PRINTER 3000 304 995 01 i PRINTER MODEL L1 G191 SERVICE MANUAL TECHNICAL DOCUMENT エラー スタイルが定義されていません 6 September 2005 1 8 Toner End Detection This machine does not have toner end detection ...

Page 12: ...ing Mode If a paper jam occurs during printing toner may be transferred to the transfer roller surface To prevent this toner from transferring to the underside of the paper the transfer roller must be cleaned before the next printing run While the machine is in the cleaning mode the Power Supply Unit board applies a negative voltage to the transfer roller The negatively charged toner on the transf...

Page 13: ...Discharge Lamp and A counter blade system is used for drum cleaning The Discharge Lamp C discharge the drum surface The cleaning blade A removes any toner remaining on the drum after the image is transferred to the paper This removed toner is stored in the used toner tank B There is no used toner overflow detection mechanism because the used toner tank is large enough for the lifetime of the toner...

Page 14: ...ません 1 11 Detailed Descriptions 1 2 7 PAPER FEED AND REGISTRATION Overview Paper Feed System Feed roller A and Friction pad B Paper Lift Mechanism Bottom plate with spring C Sheet feeder 1 sheet feeder D Tray Capacity 250 sheets E Paper End Detection Paper end sensor Paper Size Detection None G182D105 WMF A B C D E ...

Page 15: ...oller A is located above the upper tray bottom plate B and the friction pad C It allows only one sheet to feed from the paper tray They are controlled by the paper feed clutch D The registration sensor detects the leading edge of the paper and synchronizes paper feed with the activation of the laser diode to write the image on the OPC drum G182D006 WMF A B C D ...

Page 16: ...per feed sensor C Paper feed roller F Registration sensor The paper feed drive gear A always rotates while the main motor rotates since the paper feed clutch magnet clutch B is energized to turn the paper feed roller C When the paper feed clutch B is energized to turn the feed roller the paper feed roller feeds one sheet of paper from the tray The paper is fed into the machine by the registration ...

Page 17: ... スタイルが定義されていません 6 September 2005 1 14 Registration 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 This sensor also detects paper feed jams G182D107 WMF A ...

Page 18: ...into it The paper end sensor detects the presence or absence of paper The sensor has an actuator that extends through a slot in the paper tray bottom plate C so that the sensor is actuated when paper is placed in the upper tray When the upper tray runs out of paper the actuator of the paper end sensor moves into the slot in the upper tray bottom plate This informs the CPU that paper has run out G1...

Page 19: ...aper size see below 3 seconds after the registration sensor turns on Paper Size A4SEF A5SEF A5LEF A6SEF B5SEF B6SEF Letter SEF Legal SEF Envelope 91x191mm Specified Time msec 2555 1807 1273 1273 2211 1566 2400 3059 1643 Jam 3 Paper did not reach the fusing unit When the paper exit sensor does not turn on within 1 94 seconds after the registration sensor turns on Jam 4 Paper jam in the fusing exit ...

Page 20: ...ermistor C that is in contact with the hot roller surface A thermostat D protects the fusing unit from overheating The hot roller strippers E separate the copy paper from the hot roller and direct it to the exit rollers F The paper feed exit sensor G which is under the fusing unit monitors the progress of the copy paper through the fusing unit and detects misfeeds The exit rollers F drive the copy...

Page 21: ...rinting When the power saver timer expires the machine automatically goes into energy saver mode Power saver timer t1 minutes After time interval t1 passes following printing copying scanning or key in A the LCD and all LED s go off t1 t2 minutes or minutes selectable The default value is minutes Economy Mode Pressing the Clear Modes key for more than one second will change this condition When the...

Page 22: ... 1 19 Detailed Descriptions 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 Power pack Laser diode driver Fan motor Main motor Polygon mirror motor Fusing lamp G182D014 JPG ...

Page 23: ...D FUSING DRIVE RELEASE The main motor drives the paper feed unit the transfer roller the toner cassette and fusing unit through a series of gears as follows Main motor A Idle gear 1 B Idle gear 2 C Idle gear 3 D Hot roller gear H OPC drum gear F Paper feed drive gear E Idle gear 4 I Transfer roller gear G Exit roller gear J G182D009 WMF A B C D E F G H I J ...

Page 24: ...STMENT The following table shows the part replacement rank which explains the difficulty of each replacement procedure Definition A Replacement in the field cannot be recommended It takes time and needs space B Replacement in the field is recommended It should take less than 10 minutes C Replacement in the field is recommended It should take less than 5 minutes Part unit Part Name Rank Side fence ...

Page 25: ... 2 2 2 1 PAPER CASSETTE 2 1 1 PAPER CASSETTE A Paper cassette Side Fence B Side fence gear pull it out C Side fence Left Unhook at the rear D Side fence Right Unhook at the rear NOTE Lift the bottom plate before removing the side fences G182R001 JPG G182R002 JPG G182R003 JPG A B C D ...

Page 26: ...CAL DOCUMENT 2 3 Replacement Adjustment Bottom Plate E Bottom plate Unhook at both sides of the cassette F Detach from the pin G at both sides Friction Pad H Friction pad two hooks NOTE Be careful not to lose the spring I G182R004 JPG G182R005 JPG G182R006 JPG E F H I G ...

Page 27: ...moval A Laser diode unit harness B Polygon mirror motor harness C Laser unit 3 screws circled in blue above NOTE When re assembling make sure to set the positioning pin D in the hole E G182R007 JPG G182R008 JPG A B C C C F D E This device complies with IEC60825 1 1993 A1 1997 A2 2001 standard is classified as laser class 1 product and contains one class 3B laser diode 10 72 mW max 770 795 nm and o...

Page 28: ...ANUAL TECHNICAL DOCUMENT 2 5 Replacement Adjustment CAUTION VORSICHT PS CATION CLASS 3B LASER RADIATION WHEN OPEN AVOID EXPOSURE TO THE BEAM VORSICHT LASERSTRAHLUNG KLASSE 3B WENN ABDECKUNG GEOFFNET NICHTDEM STRAHLAUSSETZEN 3BLASERCAUTION WMF Warning Label F ...

Page 29: ...N AVOID EXPOSURE TO THE BEAM VORSICHT LASERSTRAHLUNG KLASSE 3B WENN ABDECKUNG GEOFFNET NICHTDEM STRAHLAUSSETZEN 3BLASERCAUTION WMF 2 6 2 3 FUSING AREA 2 3 1 FUSING UNIT Preparation 1 Remove the upper unit See Upper Unit Removal A Thermistor harness B Paper exit sensor harness C Fusing lamp harness D Fusing unit 4 screws circled in blue above G182R009 JPG A B C D D D D ...

Page 30: ... MODEL L1 G191 SERVICE MANUAL TECHNICAL DOCUMENT 2 7 Replacement Adjustment 2 3 2 PAPER EXIT ASSEMBLY A Fusing cover 1 screw B Paper exit assembly 2 screws circled in blue in the lower diagram G182R010 JPG G182R012 JPG G182R011 JPG A B ...

Page 31: ...Remove the paper exit assembly 2 3 2 Fusing Lamp A Fusing lamp 2 screws NOTE Do not touch the surface of the fusing lamp with bare hands Reassembly When reassembling be careful to set the fusing lamp on the frame first then set the terminals B and C G182R013 JPG G182R015 JPG G182R014 JPG G182R018 JPG G182R017 JPG G182R016 JPG B A C ...

Page 32: ...NICAL DOCUMENT 2 9 Replacement Adjustment Hot Roller A Electrode 1 screw B Hot roller pull it out NOTE Do not touch the surface of the hot roller with bare hands NOTE When re assembling be careful not to damage the hot roller strippers C G182R019 JPG G182R020 JPG A B C ...

Page 33: ...E ROLLER Preparation Remove the paper exit assembly 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 NOTE When re assembling be careful to set the bushing B and spring C in the correct position G182R046 JPG G182R048 JPG G182R047 JPG A B C B C ...

Page 34: ...reassembling do not damage the thermistor and check that the element touches the hot roller 2 3 6 HOT ROLLER STRIPPERS Preparation Remove the paper exit assembly 2 3 2 Remove the fusing lamp and hot roller 2 3 3 There are 3 hot roller strippers A in the fusing unit B Hot roller stripper 1 spring B each NOTE When reassembling be careful not to lose the spring B G182R023 JPG G182R022 JPG G182R021 JP...

Page 35: ...1 i PRINTER MODEL L1 G191 SERVICE MANUAL TECHNICAL DOCUMENT 2 12 2 3 7 THERMOSTAT Preparation Remove the paper exit assembly 2 3 2 Remove the fusing lamp and hot roller 2 3 3 A Thermostat 2 screws G182R024 JPG G182R025 JPG A ...

Page 36: ... Replacement Adjustment 2 4 PAPER FEED 2 4 1 PAPER FEED ROLLER REMOVAL Preparation 1 Remove the upper unit See Upper Unit Removal A Drive assembly 4 screws B Electromagnetic clutch assembly 1 clip C Paper feed roller 2 clips one at the left side D and one at the right side G182R026 JPG G182R027 JPG G182R028 JPG G182R030 JPG G182R030 JPG A B D C ...

Page 37: ...PRINTER 3000 304 995 01 i PRINTER MODEL L1 G191 SERVICE MANUAL TECHNICAL DOCUMENT 2 14 Remove the paper feed roller C from the shaft G182R031 JPG ...

Page 38: ...OG Preparation 1 Remove the upper unit See Upper Unit Removal 2 Remove the paper tray 3 Remove the toner cartridge A Paper tray guides 2 screws B Left shield 13 screws 2 screws at the bottom C Right shield 9 screws D Laser shield 4 screws E Guide shield 4 screws F Plate 2 screws G White bushings H Registration roller lift it out G182R035 JPG G182R040 JPG G182R034 JP F G A B C D E H ...

Page 39: ...CAL DOCUMENT 2 16 2 5 OTHERS 2 5 1 TRANSFER ROLLER Preparation 1 Remove the upper unit See Upper Unit Removal 2 Remove the toner cartridge A Transfer roller B Black bushing Remove the transfer roller with a flat head screwdriver G182R035 JPG G182R036 JPG G182R037 JPG A B ...

Page 40: ...tridge 4 Remove the laser unit 2 2 A Paper tray guides 2 screws B Left shield 13 screws 2 screws at the bottom C Right shield 9 screws D Laser shield 4 screws E Guide shield 4 screws F Main motor 3 screws and 1 harness G182R040 JPG G182R035 JPG G182R041 JPG F A B C D E F 2 17 Replacement Adjustment 2 5 2 FAN MOTOR Preparation 1 Remove the upper unit See Upper Unit Removal A Fan motor 1 screw 1 har...

Page 41: ...unit See Upper Unit Removal 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 2 screws at the bottom C Right shield 9 screws D Laser shield 4 screws E Guide shield 4 screws F Main motor 3 screws and 1 harness G182R040 JPG G182R035 JPG G182R041 JPG F A B C D E F ...

Page 42: ...E MANUAL TECHNICAL DOCUMENT 2 19 Replacement Adjustment 2 5 4 DISCHARGE LAMP ASS Y REMOVAL Preparation 1 Remove Fusing unit See Upper Unit Removal A Ground Wire Bracket Discharge Lamp 1 screws B Harness Discharge Lamp C Discharge Lamp Assy 2 screws B C A C ...

Page 43: ...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 4 connectors G182R042 JPG A ...

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