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Canon LBP-1260 Service Manual Download Page 39

CHAPTER 2

B. Outline 

of the 

Electrical System

The 

operations 

of this printer are controlled by the microprocessor located on the DC controller

PCB. When the power is turned on and the printer goes into standby, the 

outputs signals to drive the laser diode, motors, and solenoids in response to print commands

and image data from the external device.

device

Control

Video

controller

PCB

t

DC controller

PCB

Laser/scanner unit

solenoids

Power supply

(AC driver)

(Low-voltage

power supply)

Main switch

Summary of Contents for LBP-1260

Page 1: ...LBP 1260 SERVICE MANUAL Canon...

Page 2: ...e electrical and mechanical systems The Mechanical System Explanation of mechanical operation disassembly reassembly and adjustment procedures Installation Requirements for a suitable location install...

Page 3: ...TERFACE 2 36 2 2 A Outline 2 36 B Operation 2 37 2 3 C Video controller PCB 258 D Control panel 2 41 2 4 E Self test 2 42 F 8tatus Error Message 2 43 2 0 VI POWER SUPPLIES 2 66 2 7 A OutlIne 2 56 2 7...

Page 4: ...OF Cartridges 4 4 CARTRIDGES 4 4 C Iiandling Suggestions 4 5 CHAPTER 5 MAINTENANCE AND SERVICING PERIODIC REPLACEMENT Standard Tools 5 2 PARTS 5 l B Special Tools 5 3 EXPECTED LIVES OF V LIST OF LUBR...

Page 5: ...STORS LEDS TEST PINS JUMPBRS AND SWITCBBS ON pC BOARDS 6 68 A DC Controller PCB 6 68 B Ii voltage Power Supply PCB 6 59 C Pick up Motor Driver PCB 6 60 D Paper Feeder Driver PCB 6 60 I GENERALTIMING C...

Page 6: ...CHAPTER 1 GENEIUL DESCRIPTION I FEATURES l 1 IV PARTS OF THE PRINTER l 8 II SPECIFICATIONS l 2 V OPERATION f l L2 I I I A SAFETY I N F O R M A T I O N I 7...

Page 7: ...ansfer system is used for the charging and transfer processes The charging roller system considerably reduces the ozone produced by the charging system and the roller transfer system makes paper feedi...

Page 8: ...ent dry toner Development Toner projection development Toner supply Included in replaceable EP E cartrIdge mhhe cartridge can be used to print about 6 000 pages ofA4 Letter size paper The average prin...

Page 9: ...lo 128 g m and above type mentioned above Plain paper of A4 Legal Letter or Executive Canon approved paper 60 g m2 to 90 g m Up to 10 mm stack height about 100 sheets of 80 g m paper A4 Letter Univers...

Page 10: ...elope Feeder EF 6 Pick up speed About 9 envelopes min Envelope type COM 10 DL Monarch C5 B5 recommended envelope Envelope size Envelopes from 96mm X 189mm to 188mm X 254mm capacity Up to 55 mm stack h...

Page 11: ...1025 Uni L s 1026 UIIiVfXS 1027 Antiqueo1v 1030 Gannond 1031 Gannond 1032 Gannond r 1033 Gannond 1034 Marlgold 1035 Albertus 1036 Alberta 1046 1 Wingdings Symbol set spachlg P i t c h Point Stroke CPI...

Page 12: ...8 5 Medium Upright Landscape Line Printer PC 8 Fixed 16 67 8 5 Medium Upright Landscape Line Printer PC 8 DN Fixed Landscape Portrait Portrait P rtnll 1 16 671 8 5 1 Medium Upright 1 Landscape I 1cc7...

Page 13: ...ser scanner unit emits invisible laser beam Never disassemble the unit the reflected beam although invisible can possibly damage your eyes The unit cannot be adjusted in the field The following label...

Page 14: ...2 Face down tray 3 Right cover 4 Control panel 5 Power switch 6 Cassette 7 Multi purpose tray 6 Test print switch 9 Delivery cover IO Power receptacle 11 Parallel Lnterface connector 12 Serial interf...

Page 15: ...CHAPTER 1 2 Paper feeder 1 Paper feeder 2 Cassette 1500 sheets can be stored 1 Envelope side guide 2 Extension tray 3 weight Figure 1 7 1 9...

Page 16: ...4 Control panel 5 Multi purpose tray 6 Cassette 7 Multi purpose tray pick up roller 8 Separation pad 9 Oblique rollers 10 Cassette pick up roller 11 Developing cylinder 12 Transfer charging roller 13...

Page 17: ...2 Envelope feeder Fignre 1 9 1 Feed roller 2 Oblique roller 3 Separation roller pressure spring 4 Separation guide 5 Separation rollers 6 Pick up rollers l 11...

Page 18: ...r panel consists of the message menu display window eight indicator lights and seven menu and operation keys 1 Message Menu Display Window The message menu display window can display as many as 16 cha...

Page 19: ...ing data An error has occurred and printing is disabled An error or attendance message appears in the display No error has occurred Print data is currently stored in the printer1 s buffer No buffered...

Page 20: ...On Flashing The optional Envelope Feeder is the input source The optional Envelope Feeder is selected but does not contain envelopes The multi purpose tray is the input source The multi purpose tray...

Page 21: ...lex pages may take several minutes to process Make sure the READY indicator light has stopped flashing before you press FORM FEED to print the last page The printer must be off line before you press F...

Page 22: ...to print the self tests Test Page or Font List When the printer is off line you can press the TEST FORT key once to start the Test Page Press and hold the TEST FONT key to print the Font ListIf you pr...

Page 23: ...INE or MENU the system displays the RESET TO SAVE message At this point you have two choices 8 8 Press RESET to clear the page buffers remove temporary data and return all items to their permanent def...

Page 24: ...L PRINT MENU Press and hold MENU for approximately five seconds to display the PCL CONFIG MENU 3 Press MENU until you display the item you want to change 4 When the item you want to change appears in...

Page 25: ...those set for each menu item at the factory The printer uses these settings until you change them Temporary default settings are those set by your application software for the current print job Perman...

Page 26: ...List I for internal or S for soft For more information about printing this list see the Printing the Font List section Identifies the Font Number 0 through 999 as listed on the Font List Make sure you...

Page 27: ...m the multi purpose tray only If this tray is empty you see a prompt to load paper Loads from the optional Envelope Feeder unit only if this feeder is empty you see a prompt to load envelopes You see...

Page 28: ...hem Make sure the text length setting In your software application matches the value you use for this item If it is set to a greater value in your application the first line of text may begin successi...

Page 29: ...and printing resumes OFF Any attendance or error message remains in the display until you correct the problem tell the printer to continue or both Selects the printer interface You can select AUTO All...

Page 30: ...receive this message you may need to Install additional memory and set a value for page protection The memory required for page protection is dependent on the resolution you select A page at 600 dpi r...

Page 31: ...onts may not function correctly when DATA BITS 7 You can select 8 or 7 PARITY NONE STOP BITS 1 Determines the rate at which information is transferred between the computer and printer You can select 3...

Page 32: ...rint the Test Page 1 Press the ON LINE key to set the printer off line 2 Press the TEST FONT key once The printer displays the SELF TEST message followed by the PRINTING TEST message 3 When the page i...

Page 33: ...ss the SELECT key The printer displays the SELF TEST message followed by the PRINTING TEST message 3 When the page is complete press ON LINE to set the printer back on line Use the Test Page to verify...

Page 34: ...key for approximately five seconds The printer displays the FONT PRINTOUT message 3 When the Font List is complete press ON LINE to set the printer on line The PCL Font List shows the typeface and bi...

Page 35: ...l 29...

Page 36: ...CNAPTER 1 1 30...

Page 37: ...tput A signal that is L or has a slash in front of its name is active at ground level and inactive at the supply voltage level There is a microcomputer in this printer But as the internal operatlon of...

Page 38: ...it and the paper pick up feed system To external device computer etc 3 r_____________ _____ I SYSTEM INTERFACE I I t I I I Multi purpose tray I I 1 L___________________I I I I IT l 7 I I I I _ _ 7 1 1...

Page 39: ...and the printer goes into standby the microprocessor outputs signals to drive the laser diode motors and solenoids in response to print commands and image data from the external device EXterIlal devi...

Page 40: ...I ___ _____I SW603 SW604 SW605 walol SW602 bl SW601 2 2 L 3 3 4 4 7 7 a E k 9 E 10 l 11 11 High voltage EP E cartridge power supply PCB I J742 b Jy J2 3 I L__ 1______1____ Connector PCB t5v DC control...

Page 41: ...he ENEiL wxTA sigti and MS signal are CCL APCIN A voltage proportional to the intensity of APCO T the laser beam is input 7 The analog signal is output to adjust the intensity of the laser beam a7 IBD...

Page 42: ...Cassette pick up soleno d I I Figure 2 5 DC controller PCB FSRD LD rHOUT L to swatch the fixing mller heater ON I to deenergize the relay OFF and cut power to the fixing roller heater Output the ther...

Page 43: ...put from the second to rotate the video controller or the power is flxlng roller so that the switched OFF ilxtng roller will not be deformed INTR After the PRNT signal has been To stabilize the sensit...

Page 44: ...he laser beam to the DC controller as the AUTOMATIC POWER CONTROL INPUT APCIN signal The DC controller controls the APCOUT signal to set the APCIN signal to the specified value to stabilize the intens...

Page 45: ...ore separated by this interval Photosensitive Video signal Scanning mirror umnr w I t t t1 h t Figure 2 10 The surface of the photosensitive drum 1s charged to a negative potential by the primary char...

Page 46: ...CiX4PTER 2 signal LON to cause it to switch the laser dlode ON when the LON signal is 7 Beam detect signal VW u u FLANKING signal h f l n Figure 2 11 2 9...

Page 47: ...APCOR APCOS from the DA output ports to the analog adder circuit according to the internal data The APCOR and APCOS signals are added to this circuit at a ratio of approximately 8 to 1 and then sent t...

Page 48: ...ntensity of the laser diode LD output is detected by the photodiode PD After amplification the output voltage is fed back to the CPU as the AUTOMATIC POWER CONTROL INPUT signal APCIN The CPU continues...

Page 49: ...od IC202 makes the ViDEO DATA ENABLE signal ENBL L only when the TOPE and MSK signals are L The laser driver switches the laser ON when the ENBL signal is L and the VDATA signal is L The gate array IC...

Page 50: ...om the DC controller 2 Scanner motor rotation control Figure Z 15 shows the scanner motor control circuit The scanner motor is a 3 phase S pole DC brushless motor containing a Hall element and forms a...

Page 51: ...e SCANNER MOTOR READY signal SCNRDY to L The CPU notifies a scanner error to the video controller in the following cases a When the SCNRDY signal does not go L within 30 seconds after the scanner moto...

Page 52: ...tosensitive drum the laser beam modulated by the VDO signal illuminates the photosensitive drum surface The latent image formed on the photosensitive drum is changed to a visible image by the toner on...

Page 53: ...toner sensor that detects whether there Is enough toner or whether a cartridge is installed If the level of toner in the cartridge becomes lower than the prescribed level or if there is no cartridge i...

Page 54: ...ucture shown in Figure 2 18 The outer layer of the drum consists of an organic photoconductor OPC the base Is aluminum The printing process can be divided into five major stages Photoconductive layer...

Page 55: ...niform negative potential is applied to the photosensitive drum surface The printer uses the charging method that directly charges the drum for the primary charge The primary charging roller consists...

Page 56: ...the cylinder The areas on the drum that were exposed to the laser beam have a higher potential are less negative than the negatively charged toner particles on the developing cylinder When these area...

Page 57: ...white circles from appearing in the printed Lmage at low temperature and humidity the charge on the back of the paper is reduced by the static charge eliminator after transfer Low transfer voltage tha...

Page 58: ...leaned off In the drum cleaning stage so that the next print image will be clear Step 7 Drum cleaning Halogen heater Uooer fixina I Fi c 2 27 step 6 Fixing The upper roller surface is covered with a n...

Page 59: ...from the cylinder onto the drum The amount of toner projected depends on the DC bias voltage on the cylinder when the potential dif ference between the drum t P 1 3 2 22 Toner movement and electric po...

Page 60: ...y charging roller voltage generation When the PRNT signal from the video controller becomes L initial rotation starts the BVT RESET stgnal HVBS IJ becomes H and the circuit outputs the primary AC volt...

Page 61: ...ging roller to the photosensitive drum and so clean the roller A print bias voltage is applied to the transfer charging roller to transfer the toner on the photosensitive drum to the paper A between p...

Page 62: ...h eerl page A negative voltage is applied to the transfer charging roller to clean Lt A positive voltage is applied to the transfer charging roller to transfer toner from the surface of the drum to th...

Page 63: ...CHAPTER 2 This page intentionally left blank 2 26...

Page 64: ...er sensor PS602 The video controller sends the VERTICAL SYNC signal after the paper reaches the sensor and the leading edge of the toner image on the photosensitive drum is matched with the leading ed...

Page 65: ...he presence of a cassette Table 2 3 PJ 1 ON 1 ON j OFF Letter 1 ON 1 OFF j ON A4 1 OFF OFF 1 ON EX CUth OFF 1 ON ON B5 1 OFF 1 ON 1 OFF No cassette OFF 1 OFF 1 OFF This printer cannot detect the paper...

Page 66: ...purpose tray pick up roller clutch solenoid SL702 activates for 0 3 seconds to rotate each pick up roller The paper is fed by the oblique rollers so that the edge of the paper touches the left side p...

Page 67: ...erature increases the resistance of the thermistor THl decreases and the voltage of the FIXING According to the voltage of the FSRTH signal the microprocessor CPU on the DC controller makes the FIXING...

Page 68: ...received and then it is switched to 180 C 5 It is 185 C from paper pick up start until the VSYNC signal is received and then it is switched to 190 C or 195 C 6 It is switched to 180 C after c o n t i...

Page 69: ...hes 140 C in the standby state or during printing e Thermistor short detection If the voltage of the FIXING ROLLER SURFACE TEMPERATURE signal FSRTHI is 0 94 V 23O C or less When the CPU detects a fixi...

Page 70: ...is turned ON When the upper fixing roller temperature reaches 175 C 190 C for initial warm up temperature control the READY signal RDyl is output to the video controller After the RDY signal is output...

Page 71: ...es not reach the resist paper sensor PS602 within the required time after the paper is picked up Regist paper sensor PS602 Normal I Main motor Ml TI 2 53 seconds lupper cassette 2 01 seconds multi pur...

Page 72: ...stationary jam The microprocessor detects a delivery unit stationary jam when the delivery paper sensor PSZOl detects the sheet of paper within the required time when the paper passes through the res...

Page 73: ...ironment set using the control panel or the external device If the external device sends code data the video controller converts the data to generate the pattern of dots that the printer forms to buil...

Page 74: ...video controller synchronizes the VIDEO signal VDO with the HORIZONTAL SYNC signal IBD and the VERTICAL SYNC s i g n a l VSYNC sent from the DC controller and sends it to the DC controller In respons...

Page 75: ...the DC controller PCB to control the laser diode emission Figure 2 44 shows the layout of main ICs on the Controller PCB and Figure 2 45 is a block diagram 2 Functions of blocks a CPU The CPU is an In...

Page 76: ...d for non volatile storage of the printing environment number of prints and so on Serial Controller The NS 1655OA Serial Controller is used as the interface to the Host serial RS232 RS422 port for pri...

Page 77: ...panel contains 8 LEDs one vacuum fluorescent display VFD 7 switches and a beeper The function of the front panel is to display status and error messages allows the operator to select the printing envi...

Page 78: ...s Selects the printing environment operating mode fitility and paper source with stitches Sounds the buzzer if a switch input is ineffective or an error occurs Control panel _ _ Figure 2 46 2 operatio...

Page 79: ...Status indication display LCD as service calls 2 1 All LEDs light lit and all digits on the LCD are displayed The communi cation between the CPU and the IOP are subsequenently checked 2 2 I he fish wi...

Page 80: ...cation display Status indication display Status indication display serviceman call 1 I I I IL h4MI I I I Number field Message fkld I I I I Code number ileld Message fkld Detailed number field Number f...

Page 81: ...essage JOB REJECT The Job in which an error occurred is being sktpped TEST PRINT A Self Test is being printed FONT LIST A font list is being printed SOFT OPTION A macro or overlay form registration nu...

Page 82: ...message is displayed the printer stops printing and goes off line After the operator takes the correct action the printer resumes printing Status indication display Number Reldl Message eld Descripti...

Page 83: ...the current cassette loaded In the printer is printed on However It is not guaranteed that images will be printed correctly that Is an error may occur in the printed image MF FEED A4 Multi purpose tr...

Page 84: ...cannot be fed from the lower cassette because the upper cassette is not loaded OC I xxxxxxxxxxxxX 1Operator comment ilser defined operator call XX XXX is a messa specikd by the Display Comment 1 comm...

Page 85: ...ct image data on one page it cannot be printed printing Is not guaranteed even if the resolutlo is reduced to 300 Advlce the customer to add dpl a optional RAM SIMM If this error occors when Legal siz...

Page 86: ...LL Work memory overflow When the ON LINE key Is The speclfkd function cannot be pressed the error is cleared executed because of lnsuftlcient internal and the printer accepts data worklng memory video...

Page 87: ...Font registration full Since too many character sets are registered in the printer no more fonts can be registered MfZY SUre Perform the followlng procedure until the error is corrected 1 F ress the...

Page 88: ......

Page 89: ...SERVICE SERVICE Description Fixing unit fatlure Reference If this error occurs turn the power OFF leave the printer for about 10 minutes then turn the power ON again If the power is turned ON again b...

Page 90: ...troller corrected replace the DC to the vtdeo controller PCB controller PCB or video controller PCB 6F 77 SERVICE 6F 7A SERVICE 6F 90 SERVICE No VSYNC signal Turn the power OFF and The vsYNc signal is...

Page 91: ...ror A CPU error occurs Crystal timing error The clock frequency of the CPU and IC is incorrect P 1 Measure Turn the power OFF and OK again If the error cannot br corrected replace the extended ROM SIM...

Page 92: ...r again If the error cannot bc status during communication between corrected replace the tideo the DC controller PCB and video controller PCB or DC controller PCB controller PCB VSREQ signd timeout Tu...

Page 93: ...hen the upper cover is opened and the door switch SW601 is turned OFF The block diagram is shown below Power supply _ _ _ _ ___ _ _ __ DC controller 11 _ t__ __ ____ __ ___ _ __ ___ _ I __ ___ _ _____...

Page 94: ...the serial line The envelope feeder driver runs the motor according to the commands Figure 2 49 shows the flow of signals between the feeder and the printer The envelope feeder is supplied with 24 VD...

Page 95: ...pauses for 0 1 seconds then runs the motor backward for about 2 3 seconds One envelope is picked up and fed into the printer by the oblique rollers so that its end touches the left side plate to corre...

Page 96: ...ven by the lower separation roller Since the friction between the envelopes is weak when two or more envelopes are fed simultaneously multi feed the rotating force of the lower roller is not strong en...

Page 97: ...CHAPTER 2 C Paper Jam Detection Paper jam during pick up or feeding from the envelope feeder Is detected in the same way as for a printer paper jam detection See page 2 34 for details 2 60...

Page 98: ...gnals between the feeder and the pxlnter The paper feeder is supplied with 24 VDC from the printer Paler feeder driver Pick Paper feeder pick up motor J852 1 m Paper feeder pick up roller clutch solen...

Page 99: ...feeder pick up roller clutch solenold X851 for 0 08 seconds then after 0 04 seconds runs the motor forward for about 1 seconds The pick up roller runs through one turn and the feed roller is turned at...

Page 100: ...trical outlet 4 5 6 7 Assembly is the reverse of disassembly unless otherwise specified Note the lengths diameters and locations of screws as you remove them When reassembling the printer be sure to u...

Page 101: ...side of the cover and remove it 0 Left cover Right cover Q Upper cover unit 8 Control panel unit 0 Delivery cover 8 Front cover 0 Screw Q Right cover Figure 3 l Figure 3 2 When cleaning inside the pri...

Page 102: ...the hook holding the upper 1 Remove the right cover cover with a flat blade screwdriver and 2 Open the delivery cover remove the upper cover unit 0 Delivery cover 0 Upper cover unit Figure 3 3 Figure...

Page 103: ...cover unit Remove the left cover Remove the control panel unit Pull the side of the front cover slightly outward and remove the multi purpose tray from the front cover 0 Front cover Q Multf purpose tr...

Page 104: ...Ezhaust Fan Removiag the exhaust fan Remove the right cover and then the upper cover unit Perform step 1 to 5 on page 3 18 and remove the video controller unit Remove the DC controller cover Disconne...

Page 105: ...l 1 Remove the upper cover unit 2 Loosen the screw and open the cover 0 Screws Control panel Figure 3 13 4 5 6 Remove the two screws and then the connector cover Release the three hooks holding the co...

Page 106: ...or by performing Main Motor Removing the main motor Perform steps 1 and 5 on page 3 18 and remove the video controller unit Disconnect the connector remove the four screws and remove the main motor st...

Page 107: ...re 3 18 8 Remove the two screws disconnect the two connectors and pull the paper pick up unit forward and out 0 Screws Q Connectors 0 Paper pick up unit FQure 3 19 Note If you replace the paper pick u...

Page 108: ...ojection Then take off two claws on the right side and slide off the regist sensor holder unit to the left Slide the left end of the regist sensor holder toward the cassette feed roller shaft front in...

Page 109: ...sette pick up roller by its knob C 1 1 2 3 0 Cassette pick up roller Figure 3 24 Multi purpose Tray pick up Roller Removing the multi purpose tray Open the multi purpose tray Remove the inner cover Pu...

Page 110: ...upper cover unit Remove the inner cover 2 Remove the left cover Remove the multi purpose tray pick up 3 Remove the leaf spring roller Remove the separation pad with a flat 0 Leaf spring 0 Separation...

Page 111: ...unit Note When removing the cable from the laser PCB support the PCB with your hand The PCB can be broken easily it flexed 3 Remove the four screws and then the laser scanner unit 0 Screws Q Laser sca...

Page 112: ...The EP E cartridge cannot be disassembled 0 Primary charging roller 8 Developing unit 0 Protective shield Photosensitive drum 8 Drum cleaning unit Figure 3 32 a Protective shield The photosensitive dr...

Page 113: ...aper because it is too hard and will scratch the surface Never use the solvents to clean the drum 3 Finish cleaning as quickly as possible to avoid exposing the drum to light for a long time as this c...

Page 114: ...ler heater 0 ThermoswItch 8 Fixing unit entrance guide 8 Lower IMng roller 2 Removing the fixing roller 1 Open the delivery cover 2 Remove the two screws lift the fking unit slightly and pull it forwa...

Page 115: ...onnector and remove the left fixing CO W 0 Screws Q Connector 0 Left flxlng cover 3 4 Remove the two screws and then the fixing roller heater lead Remove the fixing roller heater lead from the connect...

Page 116: ...0 Thermoswltch unit Figure 3 41 Note on reassembly When installing the thermoswitch unit make sure that the sensing surface of the thermoswitch contacts the surface of the upper lxIng roller uniforml...

Page 117: ...0 Screw Q Thermistor Note for reassembly When installing the thermistor make sure that the sensing surface of the thermistor contacts the surface of the upper fixing roller uniformly If it does not c...

Page 118: ...ller Unit 1 Remove the right cover 2 Remove the screw and open the cover Figure 3 47 Figure 3 46 51 Remove the four screws and then the video controller unit 3 Disconnect the connector 0 Screws Q Vide...

Page 119: ...ideo controller PCB 0 Screws Video controller PCB 0 Screws Figure 3 60 31 41 Figure 3 49 If an ROM SIMM is installed the SIMM should be removed If the RAM SIMM is installed the SIMM should be removed...

Page 120: ...ors from the DC controller PCB Release the two hooks securing the DC controller PCB to the PCB holder and remove the DC controller PCB Note OP reassembly When installing the DC controller PCB put the...

Page 121: ...the paper pick up unit 2 Disconnect the three connectors Disconnect the two connectors remove the two screws release the 3ve hooks and remove the pick up motor driver PCB 2 0 Connectors Q Screws 0 Pic...

Page 122: ...rform steps 1 and 5 on page 3 18 and remove the video controller unit 2 Remove the two screws disconnect the two connectors remove the rod and t I 0 Sensor PCB Figure 3 66 0 Screws a Connectors 0 Rod...

Page 123: ...n its right side 3 Remove the two screw release the two hooks and remove the high voltage case 0 Screws Q Hooks 0 High voltage case FIgwe 3 5s 4 Release the four hooks holding the high voltage power s...

Page 124: ...eder operation be sure to hold the bottom of the PCB up or tape it to the frame if the right cover is removed b 11 Left cover Lift the top of the cover remove the two dowels then remove the left cover...

Page 125: ...ve FCB 1 Remove the right left and bottom covers 2 Disconnect the two connectors and remove the screw 0 Connectors Q Screw Figure 3 63 Figure 3 66 3 Remove the two screws and then the pick up motor a...

Page 126: ...the ground wire Release the right and left snaps with a flat blade screwdriver then remove the upper cover and the spring 0 E rings 0 Pick up rollers Q Bushings 0 Screw Q Snaps Figure 3 87 Figure 3 68...

Page 127: ...ler 0 Torque limiter Figure 3 70 Notes 1 Remove the separation guide and the upper cover as a unit If the separation guide must be removed separately adjust the position of the guide after reinstallat...

Page 128: ...two claws and remove the front cover 0 Connectors Q Cable tie 0 Screws Drive unit 0 Claws Q Front cover qpue 3 74 Figure 3 72 2 Remove the screw release the two claws and open the PCB cover 0 Screw 0...

Page 129: ...rews Q Pick up motor Figure 3 76 Removing the paper feeder driver PCB Remove the screw release the two claws and open the PCB cover See Ftgure 3 7 1 Disconnect the three connectors and remove the cabl...

Page 130: ...or connector color Ils litit blue for this LBP FItine roller heater 1 Round ended cable color Us blue for this LBPJ Power supply DC cont scanner cable Parts number or label base color Is yellow for th...

Page 131: ...it must be installed correctly The service engineer must choose a suitable location install the printer according to the proper procedures then fully check the printer before it is used The requires...

Page 132: ...re there is vibration Where it is dusty Near flames or water 2 Operating conditions l Flat level supporting surface l Ambient temperature of 10 to 32 5 C 9 Humidity of 20 to 80 RH No condensatfon Good...

Page 133: ...documentation out l Power cord Cartridge l Manual 3 Lift off the styrofoam pads right and left then lift lhe printer out 4 Take the printer out of its plastic Check that no external damage bag Peel of...

Page 134: ...h hands and install it in the printer Close the printer Check Remarks See Figure 4 2 Slowly insert it until it is securely seated at each end 3 Operation check m 1 2 3 Actlon Load the upper cassette w...

Page 135: ...ated with an organic photocon ductor OPCI that deteriorates when exposed to strong light The cartridge also contains toner This makes cartridges delicate item so tell the customer all about correct st...

Page 136: ...exposure to light Keep cartridges away from computer workstation disk drives and floppy disks The magnet in the cartridge can corrupt the video data in the memory of the workstation or the data on di...

Page 137: ...h its label up 7 Never take a cartridge apart Note If the photosensitive drum gets exposed to normal light of about 1500 lux for about 5 minutes store the cartridge in a dark place to recover Direct s...

Page 138: ...VICING I PERIODIC REPLACEMENT nr LISTS OFTOOL 6 P PARTS S 1 V LIST OF LUBRICANTS II EXPECTED LIVBS OF CLBANERS S 4 CONSUMABLBS PARTS 5 1 VI SERVICE CHECEPOZ10TS 6 S ISI PERIQDIC SERVCING W MAtNTENiXNC...

Page 139: ......

Page 140: ...September 1994 NO Parts name Parts No Qt y Expected life Remarks 1 Multi purpose pick up RBl 2127 000 I 2OO ooO sheets Replace the multi purpose roller pick up roller and 2 Separation pad RF5 0343 000...

Page 141: ...CK 0111 10 Precision flat blade screwdriver set CK 0114 11 Allen wrench set CK 0151 12 File fine CK 0161 13 Allen hex screwdriver CK 0170 M4 14 Diagonal cutting pliers CK 0201 15 Needle nose pliers C...

Page 142: ...standard tools the following special tools are required for servicing the printer T e 5 3 n Note Ranks A Each service technician should carry one with him B A group of the service technicians should s...

Page 143: ...e isopropyl pure or denatured 2 MEK methyl CH CO C2H5 Cleaning 011 and toner l Purchase locally ethyl ketone stains l Highly flammable keep away from flame 3 Libricating oil Petroleum mineral 011 Appl...

Page 144: ...I Clean I Point Tool solvent Remarks I Static charge Cleaning brush Clean eliminator a 1 pad Transfer charging roller Point Transfer charging roller Tool solvent Lint free paper Remarks Clean the roll...

Page 145: ...CHAPTER 5 The customer should do the following maintenance to maximize printer performance Table S 6 km Customer maintenance area the soft dry cloth 5 7...

Page 146: ...CHAPTER r 6 TROUBLESHOOTING I INTRODUCTION 6 1 0 SXRLANATION O F SPECIAL TOOL 6 4 III IWASWREMENT AND ADJUSTMENT I 6 8 Na IMAGE DEFECTS I 6 14 K TROURLESIiOOTING lKALFUNC TIONB a I 8 28...

Page 147: ...d in the printer If the indicator flashes the amount of toner is ins dent prepare a new cartridge If blank spots appear on prints the toner is unevenly distributed in the cartridge Take the cartridge...

Page 148: ...orm the initial check then follow the basic procedure below 1 If the printer malfunctions read section V on troubleshooting 2 If an image defect occurs determine the type of image defect from the list...

Page 149: ...To find the possible causes parts likely to be defective of a particular fault refer to the item marked Possible cause in the table In the case of No AC Power in the above table it 1s possible that t...

Page 150: ...NT Permits the printer to print the pattern specified by VIDEO SELECT VIDEO SELECT Selects the test pattern to be prlnted black image vertical lines horizontal lines or a white image PAPER FEED METHOD...

Page 151: ...elope feeder REGIST SENSOR LED Lights when paper is at the regist paper sensor MP TRAY END SENS LED Lights when paper Is at the MP tray paper end sensor DELIVERY SENSOR LED Lights when paper Is at the...

Page 152: ...for the envelope feeder Set the printer power switch to ON When the printer goes into stand by operate the tester to perform the check Note If your body Is electrically charged when you operate the p...

Page 153: ...ER 6 This page intentionally left blank 6 7...

Page 154: ...tment of the pressure nlp width If the nip width is set incorrectly a fixing problem may occur Follow the procedure below to check the nip width 1 2 3 4 51 Produce an all black prints using an EP E ca...

Page 155: ...emoved just the separation guide or replaced a bent separation guide adjust the gap as follows Install the separation guide at the position 1 5mm away from the lower separation roller Adjust Its posit...

Page 156: ...ge 3 20 and replace the DC controller PCB 2 Set VR201 PCB on the DC controller to o then place sheets in t h e cassette Press the TEST PRINT switch and obtain several test prints Fi re 6 6 3 Measure t...

Page 157: ...CHAPTER 6 o r J20 J215 I u IC201 El IC202 TB201 J214 J213 Fi m 6 7 6 11...

Page 158: ...tester b Digital multimeter t t Meter c EP E cartridge t 1 Cartridge 2 The printer driver tester switches marked with x can be set to any position 3 The voltage must be measured three times and the a...

Page 159: ...ester 1 YES I Switch the power OFF and replace the laser scanner unit I Set the meter range to 20 VDC Contact the test leads against the following connector pins on the DC controller PCB E DC controll...

Page 160: ...dged horizontal bands l 12 Faulty registration i 3 Completely blank l 6 Dirt on back of l 7 Vertical black paper streaks LP l l 0 Blank spots LP I i 3 Poor fixing I 1 4 Distortion Figure 6 9 l 4 All b...

Page 161: ...um protective shield for more than 10 seconds ilnt paper 4 Does the print quality Improve when YES Replace the print paper new paper is used Advise the customer of the proper method to store paper rt...

Page 162: ...Developing 5213 10 GND on the DC controller developing bias contact of bias PCB become about 0 76 VDC the cartridge If It Is replace the high voltage power supply PCB If the problem persists after re...

Page 163: ...3 About one second after the main YES Check whether the high motor starts does the voltage between voltage contact is making 5213 6 HVRST and J213 lO GND good contact with the on the DC controller PC...

Page 164: ...seconds after the main motor starts voltage contact Is making does the voltage between 5213 9 good contact with the SM2 and 52 13 10 GNDI on the DC developing bias contact of controller PCB become ab...

Page 165: ...eplace the h b voltage after the maln motor starts does the power supply PCB If the voltage between 52 13 9 SM2 and problem persists after J2 13 10 GND on the DC controller replacing the PCB check by...

Page 166: ...rging roller possible to clean It replace I 6 Dirt on back of paper Possible cause 1 Step 1 Transfer Check 1 Result 1 Procedure I I 1 1 Is the transfer charging roller dirty 1 YES I Clean the roller I...

Page 167: ...er while printing is performed and open the protective shield of the cartridge Are vertical black streaks on the drum I 8 Irregular and smudged vertical bands Possible cause Step Check Result Procedur...

Page 168: ...CIMPTER 6 I 9 Irregular and smudged horizontal bands Possible cause 1 Step 1 Check 1 Result Do the bands appear at regular 6 22...

Page 169: ...oller dirty or YES Replace the roller charging roller deformed7 EP E cartridge 4 Does the print quality improve when YES Replace the cartridge the cartridge is replaced7 High voltage 5 Perform a test...

Page 170: ...tridge rock It as shown in Section III of Chapter 4 to distribute the toner evenly then put it Replace the cartridge Reflection 3 Is paper dust adhering to the reflection YES Replace the laser scanner...

Page 171: ...ommended paper being used7 NO If the problem disappears advlse the customer to only else the recommended paper Paper pick up 3 Is paper dust adhering to the paper roller Dick un roller Leading edge 4...

Page 172: ...Obtain ten test prints Is the last YES Replace the thermistor image lighter than the first Ftxing r o l l e r s 3 Does poor tkdng cccur In a vertical YES Check whether the upper upper and band and lo...

Page 173: ...lt Procedure Are connectors 5208 and 5209 on the NO Attach the connectors DC controller PCB making good contact Is connector J731 on the BD PCB NO I I Attach the connector making good contact Check by...

Page 174: ...Advise the user that the outlet correct line voltage is not available at the outlet Power plug circuit breaker 2 Is the power cord securely plugged NO Push the power plugs in into the printer and the...

Page 175: ...urn the power switch OFF and detach YES Check the wiring from the connector 5103 Turn the power switch DC controller PCB and DC ON and measure the voltage between load If it is normal replace the term...

Page 176: ...Replace the video controller PCB M 6 Control panel switch malfunction Possible cause Step Check Result Procedure Operation 1 Were switches turned ON OFF NO Turn ON OFF the switches mistake according t...

Page 177: ...pick up motor driver PCB driver PCB If the problem DC controller persists replace the DC PCB controller PCB Sensor arm 5 Is the regist paper sensor arm or YES Replace the damaged paper delively paper...

Page 178: ...per is put on the multi purpose tray does the MP TRAY LED of the tester light kiver Pm kassette size printer When the paper feeder size sensing switch is pressed PAPER SIZE LED of the tester loaded in...

Page 179: ...eplace the pick up motor driver PCB when the upper cover is closed driver PCB M 10 14 NO TONER CART appears even though a catridge is loaded Possible cause Step Check Result Procedure EP E cartridge 1...

Page 180: ...Does the TONER SENSOR LED of the tester light for a High voltage while after the power switch Is turned NO Replace the high voltage power supply ON power supply PCB M 12 Faulty Pick up Motor Possible...

Page 181: ...m connector 5201 on the DC controller PCB to connector 5932 on the envelooe feeder driver PCB makinp NO good con t Does the problem improve when the 1 NO envelope feeder is replaced Place some envelop...

Page 182: ...motor start running7 Pick up motor driver FCB DC controller PCB 3 Place some paper in the upper NO Replace the pick up motor cassette and perform a test print by driver PCB If the problem using the pr...

Page 183: ...r strait rllnnlng Pick up motor driver PCB DC controller PCB 3 Place some paper on the multi purpose NO Replace the pick up motor tray and perform a test print by using driver PCB If the problem the p...

Page 184: ...e the paper feeder pick up roller perform a test print by using the pick up roller clutch clutch solenoid printer driver tester After the solenoid prescribed time does the voltage between connectors 5...

Page 185: ...controller PCB If the problem persists after replacing the PCB replace the connector PCB Possible cause 1 Step 1 Check Result 1 Procedure Connector 1 1 I Is connector 52 11 on the DC controller NO I I...

Page 186: ...unit thermoswitch individually Replace any defective parts DC controller 4 Open the delivery cover and let the NO Replace the DC controller PCB ilxing roller cool Close the cover and PCB switch the po...

Page 187: ...e DC controller PCB change from about 5 MC toow YES Replace the laser scanner unit Replace the DC controller PCB DC controller PCB NO M 25 SF 54 SERVICE Message Possible cause 1 Step Check Result Proc...

Page 188: ...through two major sections in the printer 1 the pick up section and 21 the fixing and delivery section The following explains how to troubleshoot jams in each of these sections 1 2 Figure 6 10 Pick up...

Page 189: ...load paper on the the excessive amount of multi purpose paper tray Pick up roller 7 Does the pick up roller rotate when YES Replace the roller Pick up fallure printing is performed NO Check by follow...

Page 190: ...n or deformed YES Replace defective rollers Separation roller Pick up error NO Check in the same manner as for M 18 No Envelope Pick Up from Envelope Feeder T 2 Fixing and delivery section Possible ca...

Page 191: ...oblem disappear when the YES Replace the spring spring for the separation pad Is NO reolaced Replace the sub pad 1 T 2 1 Wrinkles 1 Possible cause Step Check Result Procedure Print paper 1 Is the reco...

Page 192: ...feed area If It is replace it T 4 Skewing Possible cause Step Check Result Procedure Is the recommended paper being used NO I I Advise the user to only use the recommended paper Is the cassette set p...

Page 193: ...This page intentionally left blank 6 4 7...

Page 194: ...CHAPTER 6 A Switches 1 I Figure 11 6 46...

Page 195: ...s when door is open and cuts off the 24VES output Test print switch Upper cassette size sensing switch 1 Upper cassette size sensing switch 2 Upper cassette size sensing switch 3 Lower cassette size s...

Page 196: ...B Sensore and Sotenoids Flgurc 6 12 6 50...

Page 197: ...nsor cassette paper sensor Reglst paper sensor Multi purpose tray paper end sensor Multi purpose tray paper senscw Paper feeder paper sensor paper feeder Envelope feeder paper sensor envelope feeder C...

Page 198: ...CHAPTER 6 C Motors and Others Figure 6 13 6 52...

Page 199: ...paper pick up rollers M3 Drives the paper feeder pick up rollers paper feeder M4 Drives the envelope feeder pick up rollers envelope feeder M5 Drives the scanning mirror Fan motor FM1 Exhaust fan Fix...

Page 200: ...CEtApTER 6 D PC Boards Figure 6 14 6 54...

Page 201: ...ng sequence Applies high voltage to the primary and transfer charging rollers and the developing cylinder Drives the motors and the solenoids Relays signals between the sensors solenoids motors and pi...

Page 202: ...E Connectors Figure 6 16 6 56...

Page 203: ...Figure 6 16 6 57...

Page 204: ...cision Do not touch them when servicing Notes 1 Some LEDs receive leakage current during normal operation causing them to glow dimly when they should be OFF 2 Variable resistors that may be adjusted w...

Page 205: ...CHAPTER 6 B High voltage Power Supply PCB TB401 TB402 TB403 TB404 TB405 J402 TB406 0 Figure 6 18 Table 6 10 VR No Function VR401 For factory use 6 59...

Page 206: ...B 0 SW602 SW601 I l3 J601 1 J603 41 II 1 J604 4 1 J605 6 Al A5 SW603 0 SW604 0 SW605 7 Figure 6 19 D Paper Feeder Driver PCB f SW851 SW853 j q sEzo q J l c J Table 6 11 Table 6 12 Cassette size sensin...

Page 207: ...fl LIST OF SIGlULS fIL GENERAL CIRCUIT rv DC CONTROLLER r CHART A f V PICK UF MOTOR DIUVER A S _ll _I_ f A 3 VI SERSORCTRGUIT t s A 10 DIAGRAM A 5 VU PAPER EEERER DRl WR n A 11 A 6 VXILENVELOPIZ IWZD...

Page 208: ...l Timing chart for two consecutive prints on A4 paper Upper Caseette feed Power switch ON v Operation WAIT STBY INTR 1 PRINT I GENERAL TIMING CHART Unit Seconds LSTR STBY...

Page 209: ...DRIVE sIgnal FSRTH FWNG ROLLER SURFACE TEMPERATURE signal HVRST HVT RESET signal LON FORCIBLE LASER ON signal MON MAlN MOTOR DRNE sigml MRDY MAIN MOTOR READY signal PCLK PRINTER CLOCK slgnal PPRDY PR...

Page 210: ...no VIDEO si ml VS Q VERTICAL SYNC REQUEZT signal VSYNC VERTICAI SYNC A 4...

Page 211: ...optlonal ______ __ r __ 6 I 5 I 4 I 3 I 2 I 1 J J3 J3 Video controller DC controller Pick up motor driver Laser scanner unit PS201 PS601 Delivery paper sensor Cassette paper sensor Regist paper senso...

Page 212: ...IV DC CONTROLLER DC controller 112 fi 6 4 3 I 2 I 1 A 6...

Page 213: ...DC controller 2 2 iy j A 7...

Page 214: ...R635 li R643 1 SW605 R636 5v R605 J601 7 I SW602 R604 24VB 24VA SW601 J601 og 2 07 e 12 J601 J601 o8 I30 J601 J601 0 6 DOPEN 4 3 00 J601 0 J601 I J601 I R610 vvv R631 v v v 5v D605 t 4 L R622 D607 vvv...

Page 215: ...Pick up motor driver 2 2 SENSOR PCB J602 0 A pA J602 bB1 pA J602 om pB I 24UA IPlO 1 SD A 9...

Page 216: ...D I R 7...

Page 217: ...VII PAPER FEEDER DRIVER 3 I 1 A 11...

Page 218: ...VIII ENVELOPE FEEDER DRIVER 6 I 5 1 4 I 3 I 2 I 1 24V E 9 J932 o A J932 o IA 1 J932 o 6 J932 n B I VMN I I I I 1 I 5V C946 L c935 T I3945 I 24V L_ 24v 5v t 4 5v J931o 3 ENVI 7h R959 Inn A 12...

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