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Canon Laser Shot LBP-1120, Service Manual

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Canon Laser Shot LBP-1120 Service Manual Download Page 77

4 - 1

CHAPTER 4

I. PREFACE

A. Malfunction Diagnosis Flowchart

The malfunctions that occur in the printer are mainly classified to five factors; “image defects”, “jams”,  “transport
defects”, “malfunction”, and “malfunction status”.

If a malfunction occurred in the printer, the service technician is to identify the factor according to the flowchart and

then to rectify the problem according to the action procedures of each malfunction.

Make sure the following points at the execution of troubleshooting.

•Be sure that the connector has no poor contact when measuring the voltage at the specified terminal of the connector.
•Before handling PCBs, be sure to touch a metal part of the printer to discharge static electricity, as it can cause
damage to the PCBs.
•The laser/scanner unit cannot be adjusted in the field, so do not attempt to disassemble it.

Summary of Contents for Laser Shot LBP-1120

Page 1: ...REVISION 0 FY8 13HT 000 COPYRIGHT 2002 CANON INC CANON LBP 1120 REV 0 MAY 2002 PRINTED IN JAPAN IMPRIME AU JAPON JULY 2002 SERVICE MANUAL LBP 1120 ...

Page 2: ...ises In the event of major changes in the contents of this manual over a long or short period Canon will issue a new edition of this manual The following paragraph does not apply to any countries where such provisions are inconsistent with local law Trademarks The product names and company names used in this manual are the registered trademarks of the individual compa nies Copyright This manual is...

Page 3: ...he electrical and mechanical systems Chapter 3 The Mechanical System Explanation of mechanical operation disassembly reassembly and adjustment procedures Chapter 4 Troubleshooting Troubleshooting procedures reference values and adjustments maintenance and servicing etc Appendix General timing chart general circuit diagram etc Information in this manual is subject to change as the product is improv...

Page 4: ...PREFACE P 2 ...

Page 5: ...ircuit 2 12 E Video Interface 2 14 III LASER SCANNER SYSTEM 2 17 A Outline 2 17 B Laser Control Circuit 2 18 C Scanner System 2 21 IV IMAGE FORMATION SYSTEM 2 23 A Outline 2 23 B Print Process 2 24 V PICK UP FEED SYSTEM 2 31 A Outline 2 31 B Jam Detection 2 33 VI VIDEO CONTROL SYSTEM 2 34 A Interface Controller PCB 2 34 CHAPTER 3 THE MECHANICAL SYSTEM I PREFACE 3 1 II EXTERNALS 3 2 A Arrangement o...

Page 6: ...TING 4 18 VII MEASUREMENT AND ADJUSTMENT 4 21 A Mechanical Adjustment 4 21 B Electrical Adjustment 4 21 C LEDs Test Pins Jumpers and Switches on PCBs 4 22 VIII MAINTENANCE AND SERVICING 4 23 A Periodic Replacement Parts 4 23 B Expected Servicing Lives of Consumable Parts 4 23 C Periodic Service 4 23 D Cleaning During a Service Visit 4 24 E Standard Tools 4 26 F Special Tools 4 27 G List of Lubrica...

Page 7: ...FEATURES 1 1 II SPECIFICATIONS 1 2 III SAFETY INFORMATION 1 4 IV PARTS OF THE PRINTER 1 5 CHAPTER 1 PRODUCT INFORMATION V INSTALLATION 1 7 VI MAINTENANCE AND CHECKS BY THE CUSTOMER 1 10 VII OPERATION 1 11 ...

Page 8: ...ees the printer from the PDL conversion and image processing increasing the speed performance and reducing the cost 3 Shortened Wait Time Low Power Consumption By adopting an on demand fixing method that drives the heater only during printing the printer has shorten the wait time and reduced the consumption power during standby 4 Low Noise In addition to an on demand fixing method the printer has ...

Page 9: ...ure separation Cleaning Blade Fixing method On demand fixing 8 Feeding Manual feed slot Multi purpose tray Paper types Plain paper recycled paper colored paper labels OHT index cads postcards and envelops Paper size Note4 Manual feed slot 76 2 mm W x 127 mm L 216 mm W x 356 mm L sized paper 64 g m2 to 105 g m2 Canon recommended paper and above mentioned paper Multi purpose tray 76 2 mm W x 127 mm ...

Page 10: ...nt when the room temperature is 20 C and the rated power voltage is input 2 The time taken from that the Print signal is received from the video controller until that an A 4 sized paper is delivered completely and also when the printer is in the Ready mode at room temperatures of 20 C 3 The time taken from that the power plug is plugged in until that the printer becomes ready to print Ready or Sta...

Page 11: ...r beam is emitted within the laser scanner unit The laser beam can cause eye damage if exposed so be sure not to disassemble the laser scanner unit It is not necessary to adjust the laser scanner unit in this printer in the filed The following label is attached to the laser scanner cover UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEOFFNET NICHT DEM STRAHL AUSSETZEN RAYONNEMENT LASER INVISIBLE EN CA...

Page 12: ...er width guide 3 Manual feed slot 4 Delivery switching lever 5 Face up delivery port 6 Cartridge cover unit 7 Face down delivery tray 8 Display unit 9 Delivery guide 10 Paper pickup sub tray 11 USB port 12 Power receptacle 13 Power switch Figure 1 4 1 2 3 4 12 13 11 5 6 7 9 10 1 8 ...

Page 13: ...it 3 EP 22 cartridge 4 Primary charging roller 5 Laser scanner unit 6 Pick up roller 7 Separation pad 8 Feed roller 9 Developing cylinder 10 Transfer charging roller 11 Photosensitive drum 12 Pressure roller 13 Fixing delivery roller Figure 1 4 2 8 9 10 11 12 13 1 2 3 4 5 6 7 ...

Page 14: ...y exposed to sunlight When exposure to direct sunlight is unavoidable hanging curtains is recommended The room should be well ventilated The printer should be placed on a level surface If the printer is set up on a desk be sure a study desk is used Set the printer at a suitable distance from the wall for easy operation See Figure 1 5 1 There must be enough space around the printer to operate Follo...

Page 15: ...ctor OPC is used for the photosensitive drum intensive light will damage the drum Since toner is contained in the cartridge it is necessary to thoroughly explain the various storage and handling procedures of unsealed cartridges to customers Also note the following 1 Avoid areas which are exposed to direct sunlight such as near windows Avoid leaving the packages in cars for an extended period of t...

Page 16: ...o not open the protective shutter of the photosensitive drum and never touch the drum surface Do not clean the photosensitive drum 5 Do not disassemble EP 22 cartridge 6 Do not give vibration or shock to the cartridge 7 Intensive light easily damages the photosensitive drum causing blank spots or black stripes on the printed image Faulty print images can be corrected by stopping the printer moment...

Page 17: ...ble below lists the maintenance points that should be performed by the customer to maintain the printer at optimum level Table 1 6 1 Item Cartridge Shake or replace the cartridge as necessary Customer maintenance Clean the external cover as necessary External Cover ...

Page 18: ...me print paper status error conditions and etc Figure 1 7 1 Note GDI Graphic Device Interface A graphic drawing system that performs printing and displaying in the Windows environment and a graphic drawing system interface with the application CAPT operates on Microsoft Windows 98 Me 2000 XP The installation is done using the CanonAdvanced Printing Technology disk included with this printer CAPT s...

Page 19: ...e operation of the microcomputer has been left out As it is assumed that no repair will be made to customer circuit boards the explanation of board circuits is limited to an outline using block diagrams So there are two types of circuit explanations 1 everything from the sensor to the input sections of the major circuit boards 2 everything from the output sections of the major circuit boards to th...

Page 20: ...e host computer etc PICK UP FEEDSYSTEM IMAGE FORMATION SYSTEM LASER SCANNER SYSTEM ENGINE CONTROL SYSTEM Scanning mirror Laser diode Scanner motor BD circuit Engine controller PCB Face up delivery slot Fixing Pick up control Developing unit Photo sensitive drum Primary charging roller Cleaner unit Transfer charging roller Manual feed slot Multi purpose tray Face down delivery tray VIDEO CONTROL SY...

Page 21: ...m the input of the pick up command from the interface controller until the paper reaches the paper top sensor From the end of the initial rotation until the primary voltage going OFF From the time the primary voltage goes OFF until the main motor discontinues rotating STBY STANDBY INTR INITIAL ROTATION period PRINT Print LSTR LAST ROTATION period To keep the printer ready to print To stabilize the...

Page 22: ...mmunicate 4 Paper jam detection and door open detection Detects the sensors for the presence of paper and door open 5 Fixing unit ON Drives the fixing unit for 0 5 seconds Stops driving if the fixing unit temperature is 100 C or more 6 Scanner motor initial rotation 7 Main motor initial rotation 8 High voltage control Detects the presence of the cartridge after the primary high voltage goes ON Als...

Page 23: ...ids based on the pickup command and image data input from the interface controller A block diagram of this circuit is shown below IC201 Laser control circuit VDO VDO Engine Controller PCB Interface controller Video interface control circuit High voltage control circuit Fixing control circuit Fixing unit Low voltage power supply circuit Scanner motor control circuit AC input Reset IC IC202 Sequence...

Page 24: ... 2 Video interface 3 High voltage power supply circuit 4 Laser scanner 5 Sensors 6 Loads motors solenoids etc b Reset IC IC202 IC202 monitors 3 3V and resets the CPU when the power is turned ON c Fixing Control Circuit See the section B Fixing Control Circuit in this chapter d High Voltage Power Supply Circuit See the section C High Voltage Power Supply Circuit in this chapter e Low Voltage Power ...

Page 25: ...paper is present in the multi purpose tray or the manual feed slot MA MA MB MB L when the leading edge of the paper is detected 5V J208 5 7 9 8 11 J802 1 J801 8 5 4 2 6 J211 1 J003 3 PISNS PAPERSNS L accelerates the scanner motor 10 3 12 1 3 3V CONT1 VDO J007 4 3 2 1 5V 2 1 2 3 J211 4 J004 3 5V 2 1 5 6 Laser scanner unit Scanner motor Scanner motor driver circuit Engine controller PCB Laser driver...

Page 26: ...J204 1 SW301 Door open detection switch SW101 NEUTRAL Fixing film unit J703L 1 J703D 2 1 2 2 SW201 J703M 1 J703F 2 1 2 Fixing heater AC power input Thermal fuse Fixing heater temperature detection Thermistor EP 22 Cartridge Transfer charging roller Pick up solenoid Test print switch L rotates the pick up roller Engine controller PCB AC AC H AC N power input Fixing heater temperature detection sign...

Page 27: ...nput to the engine controller 2 Normal temperature control Maintains the normal target temperature about 190 C during printing 3 Between page temperature control Controls at low temperature in order to prevent the temperature rise at the non feeding areas between pages on the fixing film Figure 2 2 4 2 Fixing Heater Safety Circuit This circuit is installed on the engine controller PCB and always m...

Page 28: ... the 500 msec fixing heater temperature control at the powering ON the CPU starts the normal temperature control and monitors the temperature every 135 msec During this normal temperature control the temperature sequentially drops to less than 20 C twice e During the normal temperature control the fixing heater temperature falls below 100 C for the specified period of time Note The fixing film may...

Page 29: ...loping bias according to the image density data sent from the interface controller Photosensitive drum CPU PR TR DV J301 J302 J304 J303 IC201 DVACC TRNFOT TRCRNT TRPWM Power operational amplifier PRACC PRDCC IC302 IC302 Primary high voltage circuit CRGSNS 31 30 29 39 32 33 37 DC voltage generation circuit AC voltage generation circuit Developing bias circuit DC voltage generation circuit AC voltag...

Page 30: ...hotosensitive drum A negative voltage is applied to the roller at the specified timing The print bias positive voltage transfers the toner on the photosensitive drum onto the paper A voltage is applied to the roller The between page bias prevents the residual toner on the photosensitive drum from adhering to the transfer charging roller A positive voltage lower than the print bias is applied to th...

Page 31: ...plied to the ICs on the engine controller PCB BD PCB and interface controller PCB The 5VDC is supplied to the ICs on the engine controller PCB laser scanner driver PCB interface controller PCB and sensors The 24VDC is supplied to the high voltage power supply circuit main motor scanner motor and solenoids Figure 2 2 6 24VU 5V 5V 5V 24V 24V 5V 24V 5V 24V 24V 3 3V 3 3V Inlet Fixing heater Main motor...

Page 32: ...der to protect the circuits when an overcurrent or overvoltage condition occurs due to the troubles such as a short circuit on the loads When the protective functions are activated and no DC voltage is output from the power supply circuits it is necessary to turn OFF the power rectify the troubles on the loads and then turn ON the power again Be sure to wait for about two minutes before turning th...

Page 33: ...between the engine controller and interface controller and gives information on the sequence of the printer operations a System Diagram Figure 2 2 7 b Video Interface Signals Figure 2 2 8 Interface controller Video interface signal see Figure 2 2 8 External device host computer etc Printer Engine controller BD INPUT signal BDI Laser driver BD PCB VIDEO signal VDO LASER CONTROL signal CNT0 VIDEO si...

Page 34: ... electrophotographic process and the paper is delivered to the face up delivery slot The STATUS COMMAND signal SC is a bi directional signal used for serial data transfers between the interface controller and engine controller The interface controller and engine controller send data using the SC signal the interface controller sends 16 bit serial data as a command to the engine controller and in r...

Page 35: ... maximum width in the scanning direction indicated in the specifications and 240 mm or more in the feeding direction 4 Thick Paper Mode The printer contains a thick paper mode and a thick paper H mode This mode is activated by a command sent from the interface controller The mode is effective until a command for the other paper mode is sent from the interface controller The thick paper mode implem...

Page 36: ...lindrical lens and then strikes the four faced scanning mirror rotating at a constant speed Then the beam reflects off the scanning mirror passes through the focusing lens and strikes the reflective mirror The beam reflects off the reflective mirror and finally scans onto the photosensitive drum The photosensitive drum rotates at a constant speed and at the same time the laser beam scans across th...

Page 37: ...rforms the Auto Power Control stated in the following section When both the CNT0 and CNT1 signals are H the IC801 enters the masking mode Regardless of the VIDEO signals VDO VDO the IC801 prohibits the laser diode from emitting laser beams When the CNT0 and CNT1 signals are H and L respectively the IC801 enters the unmasking mode to turn the laser ON and OFF according to the VDO VDO signals sent f...

Page 38: ...n the HORIZONTAL SYNCHRONOUS INPUT signal BDI sent from the BD sensor in the laser scanner The CPU turns CNT0 and CNT1 signals to L and H respectively making the laser diode emit a laser beam at the specified timing based on the BDI signal The laser beam passes through the collimator lens and cylindrical lens and strikes the four faced scanning mirror Then the laser beam reflects off the scanning ...

Page 39: ...from the leading edge and the trailing edge of the paper The output of the BD signal starts on the leading edge If the number of BD pulse lines number of scan lines is specified by the interface controller with the command the trailing edge will be where the output of the BD signals completes If the number of scan lines is not specified the trailing edge will be where the paper top sensor PS002 de...

Page 40: ... the specified rotation number the CPU compares the BDI signal frequency with the reference frequency in the frequency comparator of the CPU and controls the output of the ACC signal and DCC signal After 1 5 seconds from the time the scanner motor reaches its specified rotation number the CPU determines that the scanner is ready The CPU determines whether or not the scanner motor is rotating in th...

Page 41: ...econds after the scanner motor was forcibly accelerated Or the scanner became ready once and then the BDI cycle is not detected in the specified value for 2 continuous seconds 3 BD error When the BDI signal is not detected in the specified cycle while the engine controller is outputting the BD signal to the interface controller The CPU does not report the BD error to the interface controller if it...

Page 42: ...time the drum surface is struck by the laser beam that has been modulated by the video signals This forms a latent image on the photosensitive drum The latent image formed on the photosensitive drum is developed into a visible image on the developing cylinder with toner and then transferred onto print paper by the transfer charging roller The residual toner on the photosensitive drum surface is sc...

Page 43: ...luminum substrate Figure 2 4 3 The printing process can be divided into five major stages 1 Electrostatic latent image formation stage Step 1 Primary charging Step 2 Scanning exposure 2 Developing stage Step 3 Developing 3 Transfer stage Step 4 Transfer Step 5 Separation 4 Fixing stage Step 6 Fixing 5 Drum cleaning stage Step 7 Drum cleaning Cleaning blade Cartridge Blade Static charge eliminator ...

Page 44: ... the negative charges is invisible to eyes which is called an electrostatic latent image Figure 2 4 5 Drum cleaning stage Transfer stage Electrostatic latent image formati on stage Developing stage 2 Scanning exposure Fixing stage 6 Fixing Paper delivery 5 Separation 4 Transfer 7 Drum cleaning 3 Developing 1 Primary charging Manual feed slot Flow of paper Direction of drum rotation Multi purpose t...

Page 45: ...maintain the potential on the drum surface uniform The DC bias changes with the developing DC bias that changes according to the IMAGE DENSITY DATA signal sent from the interface controller This direct charging method has advantages such as the lower applied voltage and almost no ozone generation over the conventional corona charging method Step 2 Scanning Exposure When the laser beam scans onto t...

Page 46: ...single component toner mainly consists of magnetite and resin binder and is held to the cylinder by magnetic attraction The toner functions as an insulator and acquires a negative charge by friction due to the rotating 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 W...

Page 47: ... can be adjusted 3 Transfer Stage In the transfer stage the toner image is transferred from the drum surface onto the paper Step 4 Transfer Figure 2 4 10 Positive charges are applied to the back of the paper to attract the negatively charged toner particles to the paper Step 5 Separation Figure 2 4 11 The elasticity of the paper causes it to separate from the drum curvature separation To stabilize...

Page 48: ... the pressure roller shaft The negative charge is applied to the paper surface by the fixing film before the paper reaches the fixing heater This improves the adhesion force of the toner particles to the paper and prevents dispersion of the toner particles This printer utilizes an on demand fixing method which uses the fixing film that requires small heat capacity This method can heat the roller q...

Page 49: ...eparation for the next print operation Step 7 Photosensitive Drum Cleaning Figure 2 4 13 Prior to the next printing the residual toner on the drum surface is scraped away by the cleaning blade to clean the drum surface The removed toner is collected into the cleaner container Cleaner container Sweeper strip Photosensitive drum Cleaning blade ...

Page 50: ...ng plate the plate is lifted by the spring force with print paper on it A sheet of the paper is picked up by the pickup roller and fed to the printer The paper pickup timing is the same for the multi purpose tray and the manual feed slot If both of the pickup sources are loaded with paper priority is given to the manual feed slot Figure 2 5 1 PS201 PS001 Feed roller Pick up roller Photo sensitive ...

Page 51: ...pecified period of time the CPU on the engine controller determines a paper jam and notifies it to the interface controller In this printer print paper is loaded from the top of the printer This may cause paper pickup failures To prevent this the printer contains a pickup retry function If the paper top sensor does detect the leading edge of paper within the specified period of time after the pick...

Page 52: ...cannot detect the leading edge of the paper within 2 7 seconds after the paper top sensor PS002 detects the leading edge 4 Wrapping jam When the paper delivery sensor PS201 detects the trailing edge of the paper within 2 0 seconds after the paper top sensor PS002 detects the trailing edge 5 Delivery stationary jam When the paper delivery sensor PS201 detects no paper out within 2 7 seconds after t...

Page 53: ...cation of the ICs on the interface controller PCB are shown in Figure 2 6 1 and the block diagram is shown in Figure 2 6 2 2 Function of Blocks a ASIC IC1 1 Controls the input output of the interface controller that comes with a DRAM 2 Controls the timing of sending the dot pattern data to the engine controller 3 Performs smoothing halftone and so on b CPU IC2 1 Controls the video interface USB in...

Page 54: ...2 35 CHAPTER 2 Figure 2 6 1 4 1 3 2 J1 2 1 20 19 J2 IC2 IC1 IC3 IC4 ...

Page 55: ...I PREFACE 3 1 II EXTERNALS 3 2 III MAIN UNITS 3 5 IV MAJOR COMPONENTS 3 9 CHAPTER 3 THE MECHANICAL SYSTEM V SWITCHES SENSORS AND LEDS 3 13 VI MOTOR SOLENOID 3 15 VII PCBS 3 17 ...

Page 56: ...ve bag to prevent the adverse effect of light 2 CAUTION Before servicing the printer disconnect its power cord from the electrical outlet 3 Assembly is the reverse of disassembly unless otherwise specified 4 Note the lengths diameters and locations of screws as you remove them When reassembling the printer be sure to use them in their original locations 5 Do not operate the printer with any parts ...

Page 57: ...emove the screw 2 Locate the claw under the area indicated by an arrow Open the bottom of the left right side of the rear cover and slide it to the front free the claw and lift the rear cover to detach 1 Screw 2 Arrow 3 Rear cover Figure 3 2 2 2 Right Cover 1 Remove the rear cover 2 Open the cover of the cartridge assembly 3 Remove the screw and free the claw under the area indicated by an arrow a...

Page 58: ...Disconnect the connector J203 from the engine controller PCB then free the harness from the guide 1 2 4 3 1 Connector 2 Harness Figure 3 2 5 1 2 3 Remove the 2 screws and free the 2 claws then detach the upper cover 1 2 1 2 3 1 Screw 2 Claw 3 Upper cover Figure 3 2 6 5 Cartridge Cover 1 Remove the rear cover and the left right cover 2 Open the cartridge cover 3 Force the front cover down to detach...

Page 59: ...TER 3 3 4 5 Slide the shaft and detach the cartridge cover 1 2 1 Shaft 2 Cartridge cover Figure 3 2 8 6 Pickup Tray 1 Remove the rear cover 2 Slide up the pickup tray to detach 1 1 Pickup tray Figure 3 2 9 ...

Page 60: ... it in the field 2 There is no Warning label laser used on the Laser scanner unit offered as a service part If you are replacing the assembly remove the label from the existing assembly and transfer it to the new assembly Or use the newly availableWarning label service part Be sure also to fully hide the connector openings from view 1 4 2 3 3 B Drive Assembly 1 Remove the rear cover and the left r...

Page 61: ...ree the 2 claws and remove the 2 gears and the screw 1 Claw 2 Gear Figure 3 3 3 3 Push the 2 claws and remove the bushing 2 1 1 Claw 2 Bushing Figure 3 3 4 1 2 4 Remove the 2 screws and disconnect the 2 connectors then remove the feed assembly 1 Screw 2 Connector 3 Feed assembly Figure 3 3 5 1 3 2 ...

Page 62: ...Remove the 2 screws and slide the delivery assembly to the right to detach 1 2 3 1 Pressure release lever 2 Screw 3 Delivery assembly Figure 3 3 7 2 2 3 1 1 E Fixing Film Unit 1 Remove the rear cover and the left right cover 2 Remove the delivery assembly 3 With the pressure release lever shifted up push down on the fixing pressure unit left right from above then slide it to the rear to detach 1 P...

Page 63: ...CHAPTER 3 3 8 5 Disconnect the connector and free the harness from the harness guide 6 Remove the fixing film unit 1 Connector 2 Harness guide 3 Harness 4 Fixing film unit Figure 3 3 10 1 2 2 3 4 ...

Page 64: ...3 9 CHAPTER 3 IV MAJOR COMPONENTS A Arrangements of the Components Figure 3 4 1 1 Pickup roller 2 Separation pad 3 Transfer charging roller 4 Pressure roller 3 2 4 1 ...

Page 65: ...of the pickup roller to the front to detach 1 Pickup roller Figure 3 4 2 1 C Separation Pad 1 Remove the drive assembly See III B of Chapter 3 2 Remove the pickup tray 3 Remove the claw and slide the pickup roller shaft to the left 1 Claw 2 Pickup roller shaft Figure 3 4 3 1 2 ...

Page 66: ... washer 4 Scanner base unit 5 Connector Figure 3 4 4 6 Slide up the pad fixing member found at the rear of the machine to remove 2 3 5 1 4 4 2 1 Pad fixing member Figure 3 4 5 1 7 Move the holding unit in the direction of the arrow to detach the separation pad 1 Holding plate unit 2 Separation pad Figure 3 4 6 8 Remove the spring from the separation pad Caution When mounting the separation pad hol...

Page 67: ... Figure 3 4 7 Caution Be sure to hold the transfer roller by its shaft NOT by its sponge portion 2 2 1 E Pressure Roller 1 Remove the drive assembly See III B of Chapter 3 2 Remove the fixing film unit See III E of Chapter 3 3 Remove the 2 screws and detach the fixing inlet guide 1 Screw 2 Fixing inlet guide Figure 3 4 8 6 Remove the gear and lift the shaft on the right of the pressure roller then...

Page 68: ...switch engine controller PCB SW201 test print switch engine controller PCB SW301 door open detection switch engine controller PCB PS002 paper top sensor PS003 paper out sensor PS201 paper delivery sensor engine controller PCB LED601 indicator LED display PCB PS003 PS201 SW101 SW301 SW201 LED601 PS002 ...

Page 69: ... Remove the paper top sensor paper out sensor 1 Paper top sensor 2 Paper out sensor Figure 3 5 2 C Power Switch Test Print Switch Door Open Detection Switch Paper Delivery Sensor 1 Remove the engine controller PCB See VII C of Chapter 3 D Indicator LED 1 Remove the display PCB See VII D of Chapter 3 1 2 ...

Page 70: ...3 15 CHAPTER 3 VI MOTORS AND SOLENOIDS A Arrangement of the Components Figure 3 6 1 M001 main motor SL001 pick up motor SL001 M001 ...

Page 71: ... detach the main motor 1 Screw 2 Main motor Figure 3 6 2 1 2 C Pick up Solenoid 1 Remove the drive assembly See III B of Chapter 3 2 Disconnect the connector J204 from the engine controller PCB then remove the screw and detach the pick up solenoid 1 Connector 2 Screw 3 Pick up solenoid Figure 3 6 3 1 2 3 ...

Page 72: ...3 17 CHAPTER 3 VII PCBS A Arrangement of the Components Figure 3 7 1 1 Interface controller PCB 2 Engine controller PCB 3 Display PCB 2 1 3 ...

Page 73: ...r assembly 3 Screw 4 Interface controller PCB Figure 3 7 3 1 2 3 3 4 C Engine Controller PCB 1 Remove the rear cover left right cover and upper cover 2 Remove the interface controller assembly See VII B of Chapter 3 3 Remove the screw found on the left side of the machine and disconnect the connector 1 Screw 2 Connector Figure 3 7 4 4 Remove the screw equipped with a washer found on the right side...

Page 74: ...ront 7 Disconnect the 2 connectors from the PCB and disconnect the connector of the main controller assembly then detach the engine controller assembly 1 2 1 Screw 2 Engine controller assembly 3 Connector Figure 3 7 7 1 2 3 8 Remove the 4 screws and the screw with a washer then disconnect the connector to detach the engine controller PCB 1 Screw 2 Screw w washer 3 Connector 4 Engine controller PCB...

Page 75: ...ntation is correct 1 Figure 3 7 10 No red mark FU101 With red mark FU102 E Display PCB 1 Remove the rear cover left right cover and upper cover 2 Remove the screw and detach the display assembly 1 Screw 2 Display assembly Figure 3 7 11 3 Using a radio wrench bend the support of the display PCB and detach the display PCB 1 2 1 Support segment 2 Display PCB Figure 3 7 12 1 1 2 ...

Page 76: ...TROUBLESHOOTING 4 13 IV TRANSPORT TROUBLESHOOTING 4 16 V MALFUNCTION TROUBLESHOOTING 4 17 CHAPTER 4 TROUBLESHOOTING VI MALFUNCTION STATUS TROUBLESHOOTING 4 18 VII MEASUREMENT AND ADJUSTMENT 4 21 VIII MAINTENANCE AND SERVICING 4 23 IX LOCATION OF CONNECTORS 4 28 ...

Page 77: ... to the flowchart and then to rectify the problem according to the action procedures of each malfunction Make sure the following points at the execution of troubleshooting Be sure that the connector has no poor contact when measuring the voltage at the specified terminal of the connector Before handling PCBs be sure to touch a metal part of the printer to discharge static electricity as it can cau...

Page 78: ...efer to the item image defects Refer to the item malfunction status troubleshooting END Do you make test print Note1 Displays operator call or service call Refer to the item malfunction status troubleshooting Refer to the item malfunction troubleshooting Refer to the item paper transport troubleshooting No No Yes Yes No No No Yes No Displays operator call or service call No Yes Yes Yes Yes ...

Page 79: ...user If the information is not available make test prints with all feasible combination of paper source and delivery source in the printer and find out the factor 2 The image defect occurred at the user side might not re occur on its test print In this case make a test print from the external device and infer the factor by the output image Then find the factor according to the item image defects ...

Page 80: ...per is not moist 3 Loading paper into the pickup source a The stack of paper loaded into the pickup source should be within the specified capacity of the source b The paper is set in the selected pickup source correctly 4 Installing the EP 22 cartridge The EP 22 cartridge should be installed correctly 5 Condensation During winter if the printer is brought from a cold place such as a warehouse into...

Page 81: ...d paper into the printer and switch the power ON 2 When the printer is in the STANDBY mode press the test print switch pointed by the arrow in Figure 4 1 2 with a precision flat blade screwdriver and print a test print shown in Figure 4 1 3 Figure 4 1 2 Figure 4 1 3 3 Identify the contents of the failure from the test print and rectify the problem according to the action procedures of image defect...

Page 82: ... test print 1 Set print paper in the multipurpose tray and turn ON the power switch 2 When the printer is in the standby mode open the Properties dialog box Clicking on Print a Test Page prints the test pattern shown in figure below Figure 4 1 4 ...

Page 83: ...ng roller contact on the engine controller PCB and the transfer charging roller shaft contact Action Clean the contacts if dirty If the problem still remains after cleaning or parts are deformed or damaged replace them 5 Defective laser scanner unit Action Replace the laser scanner unit 6 Defective engine controller PCB Action Replace the engine controller PCB 2 1 Light 2 2 Dark 2 3 Completely bla...

Page 84: ...ler PCB Action Replace the engine controller PCB II 3 Completely Blank Possible Causes 1 Damaged laser shutter open close projection of the cartridge cover Action Replace the cartridge cover 2 Poor contact in the developing bias contact on the engine controller PCB and cartridge contact Action Clean the contacts if dirty If the problem still remains after cleaning or parts are deformed or damaged ...

Page 85: ...page 4 12 If the dirt cannot be removed replace the dirty part s II 7 Black vertical lines Possible Causes 1 Circumferential scars on the photosensitive drum Action Replace the cartridge 2 Dirty fixing unit entrance guide Action Clean the guide 3 Scar s on fixing film unit Action Replace the fixing film unit II 8 White Vertical Lines Possible Causes 1 Lack of toner Action Remove the cartridge from...

Page 86: ...ite Horizontal Lines Possible Causes 1 Horizontal scar s on the photosensitive drum Action Replace the cartridge 2 Defective fixing film unit Action Replace the fixing film unit II 11 Blank Spots Possible Causes 1 Lack of toner Action Remove the cartridge from the printer Rock the cartridge in the manner described on V B c of Chapter 1 and then install it back to the printer If the problem still r...

Page 87: ...nnect the connector J208F on the engine controller PCB or connector J801F and J802F on the laser scanner unit correctly 2 Defective laser scanner unit Action Replace the laser scanner unit 3 Defective engine controller PCB Action Replace the engine controller PCB II 14 Faulty Registration Possible Causes 1 Dirty or worn pickup roller Action Clean the pickup roller Replace the roller if the dirt ca...

Page 88: ...pots Dirt on back of paper Fixing film unit Pressure roller Photosensitive drum Feed roller Developing cylinder 14 4 24 20 16 5 24 12 12 Primary charging roller Poor fixing Susceptible location Periodical dirt and spots appearing on the image Approx 45 Approx 75 Approx 63 Approx 52 Approx 75 Approx 38 Approx 38 ...

Page 89: ... to the malfunction diagnosis flowchart Figure 4 1 1 If a jam is found the defective part must be located and rectified by the following procedures The paper path can be divided into two sections 1 paper pickup and feed block and 2 fixing and delivery block Figure 4 3 1 1 2 ...

Page 90: ...or contact in the connectors on the pickup roller solenoid drive signal line Action Reconnect the connector J204F on the engine controller PCB 7 Defective pickup roller solenoid Action Disconnect the connector J204F on the engine controller PCB Measure the resistance between the connector J204 1 and J204 2 on the cable side If the measured value is not about 120Ω replace the pickup roller solenoid...

Page 91: ...moothly Replace the lever if damaged 7 Defective paper delivery sensing lever spring Action If the spring is out of place set it in the right position Replace the spring if damaged or deformed 8 The fixing delivery roller does not rotate smoothly Action Check the gears and replace any worn or fractured gear s If the fixing delivery roller is worn replace it 9 The facedown delivery roller does not ...

Page 92: ...e the sub pad if worn IV 2 Wrinkles Folded Leading Edge Possible Causes 1 Paper dust or dirt accumulates on the pickup roller feed roller and paper guide Action Clean the dirty areas 2 Dirty fixing unit entrance guide and pressure roller Action Clean the fixing unit entrance guide and pressure roller 3 Scarred or deformed fixing film unit Action Replace the unit if scarred or deformed 4 Scarred or...

Page 93: ... the engine controller PCB V 2 No DC Power Possible Causes 1 No AC power is supplied Action Perform the No AC Power checks 2 Overcurrent overvoltage detection circuit is activated Action If the problem persists after the power supply connector is plugged OFF and then IN again find the cause of activation of the overcurrent overvoltage detection circuit in the power supply unit Wait for two minutes...

Page 94: ...PCB is about 5V and also the voltage between the connectors J208M 1 and J208M 4 is about 24V replace the laser scanner unit 4 Defective engine controller PCB Action Replace the engine controller PCB VI 2 Fixing Unit Failure Possible Causes 1 Poor contact in the connectors Action Reconnect the connector J206 on the engine controller PCB 2 Broken wire or short circuited thermistor Action Turn OFF th...

Page 95: ... or damaged replace it 5 Defective engine controller PCB Action Replace the engine controller PCB VI 4 Although the door is closed after installing the cartridge the printer cannot enter the READY mode outputting a DOOR OPEN status Possible Causes 1 Damaged claw of the door switch on the connector holder Action Replace the connector holder 2 Defective door open detection unit Action Replace the do...

Page 96: ...uses 1 Poor contact in the primary high voltage contact on the engine controller PCB and cartridge contact Action Clean the contacts if dirty If the problem still remains after cleaning or parts are deformed or damaged replace them 2 Defective cartridge Action Replace the cartridge 3 Defective engine controller PCB Action Replace the engine controller PCB ...

Page 97: ...r with the printed side facing down 3 Select faceup delivery by turning the delivery switching lever down 4 Press on the test print switch 5 Turn OFF the printer when the leading edge of the print emerges at the faceup tray After 10 seconds from tuning OFF the printer open the cartridge cover and take out the print 6 Measure the width of the glossy band across the paper and check that it meets the...

Page 98: ... are for the factory use only The adjustment and check using these test pins etc require special tools measuring instruments and high precision Do not touch them in the field 1 Engine Controller PCB Figure 4 7 2 Table 4 7 2 SW201 SW No Function Switch for test print SW301 Switch for door open detection J401 J204 J203 2 1 SW201 1 2 1 2 J205 1 6 4 1 J206 1 2 SW301 J208 1 12 J211 1 6 J102 1 2 J201 1 ...

Page 99: ...y affect printer performance These parts should be replaced during a regular service visit closest to the end of the parts expected life B Expected Service Lives of Consumable Parts This printer does not have any consumable parts Note Consumable parts are the parts that may need to be replaced due to deterioration or damage at least once prior to the elapse of the printerÕs warranty period They on...

Page 100: ...CHAPTER 4 4 24 D Cleaning During a Service Visit 1 Fixing unit entrance guide 2 Pick up roller 3 Separation pad 4 Transfer charging roller Figure 4 8 1 3 4 2 1 ...

Page 101: ...ry lint free paper 3 Separation Pad Clean the rubber area with a dry lint free paper 4 Transfer Charging Roller In general the transfer charging roller is not to be touched or cleaned If unavoidable clean the roller with a dry lint free paper Do not use water or solvent and be careful not touch the roller with bare skin Make sure not to contaminate the roller with solvent or oil ...

Page 102: ...ttle Solder Desoldering wick Lint free paper Oiler Plastic jar Blower brush Digital multimeter No Tool name TKN 0001 TKN 0069 CK 0057 CK 0101 CK 0104 CK 0105 CK 0106 CK 0111 CK 0114 CK 0151 CK 0161 CK 0170 CK 0201 CK 0202 CK 0203 CK 0205 CK 0218 CK 0302 CK 0303 CK 0309 CK 0314 CK 0315 CK 0327 CK 0328 CK 0329 CK 0330 CK 0336 CK 0349 CK 0351 CK 0399 CK 0552 With a clip 0 02 to 0 3mm M4 M5 Length 363...

Page 103: ...Name Use MEK methyl ethyl ketone CH3CO C2H5 Cleaning oil and toner stains Purchase locally Highly flammable keep away from flame 2 Lubricant Special oil Special solid lubricating material Lithium soap Apply to gears and between gear and shaft Tool No HY9 0007 20g tube 3 Electricity grease High performance grease Apply to grounding plate Electricity grease Tool No CK 8006 ...

Page 104: ...CHAPTER 4 4 28 IX LOCATION OF CONNECTORS J703F J703 J204 J208 J211 J003 J802 J801 J102 J702 J206 J002 J201 J1 J401 J601 J007 J203 Figure 4 9 1 ...

Page 105: ...I GENERAL TIMING CHART A 1 II GENERAL CIRCUIT DIAGRAM A 3 APPENDIX III LIST OF SIGNALS A 5 IV MESSAGES TABLE A 7 ...

Page 106: ...C control is not executed when thermistor temperature is already 100 C Note2 The heater is turned OFFwhen the thermistor temperature reaches 100 C Fixing heater H701 Pick up command Main motor M001 Scanner motor M801 Pick up solenoid SL001 Paper top sensor PS002 Paper delivery sensor PS201 Primary voltage AC Primary voltage DC Developing bias AC Developing bias DC ransfer voltage Laser diode Unit ...

Page 107: ...APPENDIX A 2 ...

Page 108: ...L 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 1 2 3 4 5 6 1 2 3 4 4 3 2 1 3 2 1 3 2 1 4 3 2 1 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 1 2 1 2 1 3 SW201 TH701 24V GND J305 FILM BIAS FILM PRESSURE ROLLER J601 SOLD23 SOLD24 LED601 SOLD2 SOLD1 SOLD4 SOLD3 SOLD6 SOLD5 SOLD8 SOLD7 ...

Page 109: ...B Interface Connector To host computer J2 Interface Controller PCB GND 3 3V 3 3V 5V GND GND VDO VDO RESET BD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 SC SCLK GND 5V 3 3V GND GND 24V 24V GND To engine controller PCB 1 2 3 4 VDD DM DP GND ...

Page 110: ...nal 12 RESET O L RESET signal 13 VDO I L VIDEO signal 14 VDO I L VIDEO signal 15 GND 16 GND 17 5V 18 3 3V 19 3 3V 20 GND J203 1 24V 2 GND J204 1 24V 2 CPUD O H PICK UP SOLENOID DRIVE signal J205 1 CLK 2 SO 3 SI 4 STRB 5 GND 6 5V J206 1 FSRTH I FIXING HEATER TEMPERATURE DETECT signal 2 GND J208 1 24V 2 ACC O L SCANNER ACCELERATION signal 3 DEC O L SCANNER ACCELERATION signal 4 GND 5 5V 6 GND 7 VDO ...

Page 111: ...signal 4 5V 5 GND 6 PAPERSNS I H PAPER OUT SENSOR signal J301 DV O L DEVELOPING HIGH VOLTAGE DRIVE signal J302 TR O L TRANSFER HIGH VOLTAGE DRIVE signal J303 GND J304 PR O L PRIMARY CHARGING HIGH VOLTAGE DRIVE signal J401 1 MB O H MAIN MOTOR DRIVE signal 2 MB O H MAIN MOTOR DRIVE signal 3 MA O H MAIN MOTOR DRIVE signal 4 MA O H MAIN MOTOR DRIVE signal ...

Page 112: ...Service Calls see Chapter 4 B Status Window CAPT displays the printing environment and printing status on the status window On the status window messages are indicated in the Message area depending on the following four conditions Idling Status Printing Status Status Not Available Error Status Also the descriptions and procedures for the messages are displayed in the Error message area For the det...

Page 113: ... printer has stopped the printing operation and paused because the Pause Job button is clicked during printing Message area Stopping Error message area None Content The printer has stopped the printing operation because the Delete Job button is clicked during printing Message area Cleaning Error message area Now printing a cleaning page Please wait a moment Content The printer is printing a cleani...

Page 114: ... Is the printer switched on Is the printer cable connected Content The printer has become incommunicable during printing Action Check the printer by following the instructions indicated in the Error message area and perform the trouble shooting Message area Incompatible Printer Error message area The wrong printer is connected Content The printer is not LBP 1120 Action When you use a printer other...

Page 115: ...ransfer error occurred Perform the following 1 Discard last printed page 2 Resume printing Content Data transfer to the printer was too late Or the printer cable is disconnected or the port is connected to another printer during printing Action If you follow the instructions indicated in the Error message area the printer will print with lower resolution Message area Insufficient Memory Error mess...

Page 116: ...Prepared by Office Imaging Products Device Quality Assurance Center CANON INC Printed in Japan REVISION 0 JULY 2002 30359 5 1 Hakusan 7 chome Toride shi Ibaraki 302 8501 Japan ...

Page 117: ...PRINTED IN JAPAN IMPRIME AU JAPON XXXXxxx XX 1 CANON INC This publication is printed on 100 reprocessed paper ...

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