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C. High-voltage Power Supply Circuit
1. Outline

Figure 2-2-5

This circuit applies the combined voltage of the DC voltage and AC voltage to the primary charg-
ing roller and developing cylinder, and also applies the positive or negative DC voltage to the
transfer charging roller, according to the instructions sent from the microcomputer (CPU) on the
engine controller.

The circuit adjusts the image density by changing the primary high-voltage (DC) and the

developing bias according to the image density data sent from the interface controller.

CHAPTER 2

2 - 10

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

28

32

33

37

DC voltage

generation

circuit

AC voltage

generation

circuit

Developing bias circuit

DC voltage

generation

circuit

AC voltage

generation

circuit

Combined

Combined

Transfer voltage circuit

Positive

voltage

generation

circuit

Negative

voltage

generation

circuit

Primary charging roller

Developing cylinder

Transfer
charging roller

Engine controller PCB

J305

FG

Pressure roller

Fixing film unit

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Summary of Contents for LBP-800

Page 1: ...SERVICE MANUAL REVISION 0 COPYRIGHT 1999 CANON INC CANON LBP 800 REV 0 AUG 1999 PRINTED IN JAPAN IMPRIME AU JAPON AUG 1999 RY8 13A0 000 ...

Page 2: ...ared by PERIPHERAL PRODUCTS QUALITY PLANNING DIV PERIPHERAL PRODUCTS TECHNICAL DOCUMENTATION DEPT CANON INC 5 1 Hakusan 7 chome Toride City Ibaraki Pref 302 8501 Japan Use of this manual should be strictly supervised to avoid disclosure of confi dential information ...

Page 3: ...l 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 improved or redesi...

Page 4: ...600 PS laser beam printer final pages were printed on AGFA Selectset avantra 25 All graphics were produced with Macromedia FreeHand J and all documents and page layouts were created with QuarkXPress E The video images were captured with SONY degital video camcorder and Radius PhotoDV capture board system and modified with Adobe Photoshop J ...

Page 5: ...L SYSTEM 2 4 A Engine Controller PCB 2 4 B Fixing Control Circuit 2 8 C High voltage Power Supply Circuit 2 10 D Low voltage Power Supply Circuit 2 12 E Video Interface 2 14 III LASER SCANNER SYSTEM 2 16 A Outline 2 16 B Laser Control Circuit 2 17 C Scanner System 2 20 IV IMAGE FORMATION SYSTEM 2 22 A Outline 2 22 B Print Process 2 23 V PICK UP FEED SYSTEM 2 30 A Outline 2 30 B Jam Detection 2 32 ...

Page 6: ...MALFUNCTION STATUS TROUBLESHOOTING 4 17 VII MEASUREMENT AND ADJUSTMENT 4 20 A Mechanical Adjustment 4 20 B Electrical Adjustment 4 20 C LEDs Test Pins Jumpers and Switches on PCBs 4 21 VIII MAINTENANCE AND SERVICING 4 22 A Periodic Replacement Parts 4 22 B Expected Servicing Lives of Consumable Parts 4 22 C Periodic Service 4 22 D Cleaning During a Service Visit 4 23 E Standard Tools 4 25 F Specia...

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

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Page 9: ... converting image processing As a result it has increased its speed performance and reduced the cost 3 Shortened Wait Time Low Power Consumption By adopting an on demand fixing method that enables driving the heater only during printing this printer has shorten the wait time and reduced the consumption power during standby 4 Low Noise In addition to an on demand fixing method this printer has incr...

Page 10: ...er Separation Curvature 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 Manual feed slot 76 2 mm W x 127 mm L 216 mm W x 356 mm L sized paper 64 g m2 to 135 g m2 Canon recommended paper and above men tioned paper Multi purpose tray 76 2...

Page 11: ...nd 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 Standby mode 4 Only plain paper and recyc...

Page 12: ... during corona discharge from the charg ing roller The ozone gas is emitted only while the printer is operating This printer meets the ozone emission reference value set by Underwriters Laboratory UL at the time it is shipped from the factory CHAPTER 1 1 4 ATTENTION VORSICHT ATTENZIONE PRECAUCION VARO VARNING ADVARSEL ADVARSEL UNSICHTBARE LASERSTRAHLUNG WENN ABDECKUNG GEöFFNET NICHT DEM STRAHL AUS...

Page 13: ...ay 2 Paper 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 Delivery sub tray 9 Paper pick up sub tray Figure 1 4 1 10 Interface connector 11 Power receptacle 12 Power switch Figure 1 4 2 CHAPTER 1 1 5 11 12 ...

Page 14: ...xing film unit 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 3 CHAPTER 1 1 6 11 12 13 ...

Page 15: ...aucets boilers humidifiers or refrigerators Avoid areas near open flames dusty locations windy locations areas which emit ammonia gas and areas directly exposed to sunlight When exposure to direct sunlight is unavoid able 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...

Page 16: ...ic photoconductor OPC is used for the photosensitive drum intensive light will damage the drum It is necessary to thoroughly explain to customers the various storage and handling procedures of unsealed cartridges 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 time as high temperatures can damag...

Page 17: ...he photosensitive drum and never touch the drum sur face Do not clean the photosensitive drum 5 Do not disassemble EP 22 cartridge 6 Do not give vibration or shock to the cartridge 7 As the photosensitive light is easily damaged by intensive light blank spots or black stripes may appear on the printed image if it is exposed to strong light Faulty print images can be corrected by stopping the print...

Page 18: ...that should be performed by the customer to maintain the printer at opti mum level are listed below Table 1 6 1 CHAPTER 1 1 10 Item Cartridge Shake or replace the cartridge as necessary Customer maintenance Clean the external cover as necessary External Cover ...

Page 19: ...uter screen Figure 1 7 1 Note GDI Graphics device interface Graphic writing system to perform printing and screen display in the Windows environ ment and a graphic writing system interface for the application CAPT is used by installing on Microsoft Windows NT4 0 or Microsoft Windows 95 98 The installation is done using the Canon Advanced Printing Technology disk included with this print er CAPT sp...

Page 20: ...n the disk 10 MB or above Printer port Standard Centoronics parallel port CD ROM drive Sound PCM sound module is required to use the Voice message Monitor size 640 x 480 or above 16 colors or above Network 10 Base T or 100 Base TX is required to use network adapter Recommended Operating Environment CPU MMX Pentium 200 MHz or above RAM 48 MB or above OS software This printer operates only on Micros...

Page 21: ...open the Install From Disk dialog box Enter the name of the CD ROM drive in the Copy manufacture s files from text box and then click the Browse button 7 Add Printer Wizard Printer selection 2 If the name of the printer appears in the Printers list box and the printer you are installing is selected click the Next button If you want to change the printer click the Have Disk but ton to reselect the ...

Page 22: ...on the print server 1 Switch on the client server PC start up Microsoft Windows NT and log in 2 Use one of the following methods to start up the Add Printer Wizard Start button Settings Printers Printers folder Open the Add Printer My Computer Printers folder Open the Add Printer Explorer Desktop My Computer Printers Open the Add Printer 3 Add Printer Wizard Initial screen Select either to use thi...

Page 23: ... LBP 800 print queue window and select the Properties from the Printer menu From the Microsoft Windows applications How to open the Printer Properties varies in each application See the application manual From the Microsoft Windows Shortcut To create a shortcut open the Printers folder drag the Canon LBP 800 icon with the right mouse button to the desktop and select the Create Shortcut s Here See ...

Page 24: ...ule 4 Sharing Designates whether the printer is shared 5 Security Sets the security for the printer 6 Select Forms Makes settings for user defined paper To store the items set in each tab click the OK button and close the Print Properties dialog box To close the box without storing the items set in each tab click the Cancel button Figure 1 7 3 1 OK Changes the items in this dialog box and closes t...

Page 25: ...river Click on this button when installing a new or updated printer driver 5 Separator Page As this printer does not support separator pages clicking on this button will not print a separator page 6 Print Processor Displays the Print Processor dialog box 7 Print Test Page Print a test page supported by the Microsoft Windows NT standard CHAPTER 1 1 17 Canon LBP 800 Properties General Ports Scheduli...

Page 26: ...le 2 Default Datatype Displays the list of spool datatype available for the selected print proces sor in the Print Processor list box 3 Always spool RAW datatype Select the check box when you want to always spool data as RAW datatype 4 OK Changes the items in this dialog box and closes the box 5 Cancel Closes this box without changing its items CHAPTER 1 1 18 Selectingadifferentprintprocessormayre...

Page 27: ...figure LPT Port dialog box which enables you to set ports 5 Enable bidirectional support Selects whether or not the Language Monitor is used for bi directional communication between the PC and printer 6 Enable printer pooling Selects whether or not the printer pool is used Select the check box when you want to select multiple ports in the Print to the following ports list box The printer does not ...

Page 28: ...dded Select one port from the list The printer cannot be connected to ports other than Local Port and AXIS CAPT Port network adapter port 2 New Monitor Installs the print monitor Not available for this printer 3 New Port Opens the Port Name dialog box which enables you to enter the name of the port to be added 4 Cancel Returns to the Ports tab without changing the items CHAPTER 1 1 20 Available Pr...

Page 29: ...onfigure LPT Port dialog box is shown in Figure 1 7 8 Figure 1 7 8 1 Transmission Retry Sets the time out period of ports Unit second 2 OK Changes the items in this dialog box and returns to the Printer Ports tab 3 Cancel Returns to the Printer Ports tab without changing its items in this dialog box 4 Help Opens the Help topics CHAPTER 1 1 21 Configure LPT Port 90 Transmission Retry Timeout second...

Page 30: ...ely Starts printing after the first page of the document is spooled 7 Print directly to the printer Sends the data directly to the printer without spooling Keep this setting off as printing cannot be conducted from applications when it is on The Warning dialog box will appear when it is set on 8 Hold mismatched documents The spooler compares the settings of the printer and docu ment before sending...

Page 31: ... 10 Keep documents after they have printed Sets the spooler not to delete documents after they have been printed CHAPTER 1 1 23 ...

Page 32: ...he box if necessary 4 Alternate Drivers Enables you to install drivers of different version or with different CPU as an alternate driver As this printer does not support Alternate Driver do not select the alternate drivers in this list box CHAPTER 1 1 24 X Canon LBP 800 Properties General Ports Scheduling Sharing Canon LBP 800 Security Select Forms You may install alternate drivers so that users o...

Page 33: ...rmissions dialog box See Page 1 26 2 Auditing Opens the Printer Auditing Dialog box See Page 1 27 3 Ownership Opens the Owner dialog box CHAPTER 1 1 25 X Canon LBP 800 Properties General Ports Scheduling Sharing Permissions Security Select Forms View or set permission information on the selected item s View or set auditing information on the selected item s Permissions OK Cancel Auditing Ownership...

Page 34: ...ct the group or user name and then select the type of access you want from the Type of Access drop down list 4 Type of Access Displays the list of available types of access 5 OK Changes the items in this dialog box and closes the box 6 Cancel Closes the dialog box without changing its items 7 Add Opens the Add Users and Groups dialog box which enables you to add the selected group and user to the ...

Page 35: ...ames of groups and users that are being audited 3 Events to Audit Displays the list of events which can be audited The list includes Print Full Control Delete Change Permissions and Take Ownership Success or Failure can be selected for each event 4 OK Changes the items in this dialog box and closes the box 5 Cancel Closes the dialog box without changing its items 6 Add Opens the Add Users and Grou...

Page 36: ...Forms 3 Change Forms Opens the Change Forms dialog box and selects newly registered user defined paper from the list of paper available 4 Units Selects the unit used in Paper Size 5 About Open the About dialog box CHAPTER 1 1 28 Canon LBP 800 Properties General Ports Scheduling Sharing Security Selected Forms Form 1 Form 2 Form 3 OK Cancel X About Select Forms Units Paper Size Change Forms Width 2...

Page 37: ...en the Document Defaults box varies in each application refer to each appli cation manual From the Microsoft Windows shortcut To create a shortcut open the Printers folder drag the Canon LBP 800 icon with the right mouse button to the desktop and select the Create the Shortcut s Here See the Microsoft Windows NT User s Guide for details Double click on the shortcut icon to open the printer window ...

Page 38: ...in general printing 2 Finishing Selects whether or not to perform print in collate 3 Quality Sets items relating to image To store the items set in each tab click the OK button and close the Print Properties dialog box To close the box without storing the items set in each tab click the Cancel button Figure 1 7 16 1 OK Changes the items in this dialog box and closes the box 2 Cancel Closes the dia...

Page 39: ...file again by reentering the name of the driver It can also add and edit new profile by changing the name of the driver Even if the printer driver is unintalled the Profile will not be deleted If the printer driver is reinstalled you can select and edit the registered items again This printer driver supports submitting information to files and reading it from files However the Windows 95 98 profil...

Page 40: ... 7 18 1 Name Sets the name of the Profile 2 Icon Selects the icon symbolizing the Profile 3 Comment Writes comments as sub information of the Profile 4 OK Changes the items and closes the box 5 Cancel Close the box without changing its items 6 Help Opens the Help topics 7 View Settings Displays information of the items CHAPTER 1 1 32 Add Profile OK Cancel Help View Settings Name X Icon Comment 7 4...

Page 41: ...the dialog box without changing its items 6 Help Open the Help topics 7 Import Imports the Profile information from files 8 Export Exports the Profile information to files 9 Comment Writes comments as sub information of the Profile 10 Icon Selects the icon symbolizing the Profile 11 Name Selects the name of the Profile Details of each tab are described below CHAPTER 1 1 33 Edit Profile Name X Prof...

Page 42: ... the Page Size 6 Page Layout Specifies the number of page printed per print sheet When you specify the 2 4 8 9 Pages per Sheet the Manual Scaling will disappear and Page Order will be dis played 7 Orientation Sets the printing orientation 8 Copies Sets the number of printing 9 Output Size Sets the paper size physically 10 Page Size Sets the paper size theoretically CHAPTER 1 1 34 OK Cancel Canon L...

Page 43: ...he View Settings button in the Page Setup dialog box The View Setup dialog box is shown in Figure 1 7 21 Figure 1 7 21 CHAPTER 1 1 35 View Settings X OK Page Setup Finishing Quality Page Size Output Size Copies Orientation Page Layout Manual Scaling Overlay Letter Match Page Size 1 Portrait 1 Page per Sheet Not Selected Not Selected ...

Page 44: ...e in the Overlay dialog box to the default value 6 Help Opens the Help topics 7 Units Selects the unit used in the Size and Position 8 Size Specifies the Size of the Overlay form 9 Position Specifies the location of the Overlay form 10 Overlay Placement Selects either to place the Overlay form in the background or fore ground of the printing data 11 Browse Selects the Overlay form files CHAPTER 1 ...

Page 45: ...s the Preview 2 View Settings Opens the View Settings dialog box 3 Preferences Opens the Preferences dialog box 4 Restore Defaults Resets the value in the Page Setup dialog to the default value 5 Collate Specifies either to print in collate or page CHAPTER 1 1 37 OK Cancel Canon LBP 800 Default Page Setup Finishing Quality Letter View Settings Scaling Auto Collate Preferences X Add Edit Profile Le...

Page 46: ...er driver you can specify either to contin ue printing it ignoring the difference of the paper sizes or to require the user to change the paper 2 EMF Spooling Specifies the Spool file format 3 OK Changes the items in the dialog and closes the box 4 Cancel Closes this dialog box without changing its items 5 Restore Defaults Resets the value in the Preference dialog box to the default value 6 Help O...

Page 47: ...tions dialog box 5 Resolution Specifies the Resolution 6 Halftoning Specifies the Halftoning form 7 Brightness Adjusts 80 to 80 of brightness 8 Contrast Adjusts 80 to 80 of contrast 9 Restore Defaults Resets the value in the Quality tab to the default value CHAPTER 1 1 39 OK Cancel Brightness Canon LBP 800 Default Page Setup Finishing Quality Letter View Settings Scaling Auto Halftoning More Optio...

Page 48: ...els 2 Toner Saver Specifies whether or not to use the Toner Saver mode 3 Automatic Image Refinement Specifies whether or not to use the Super Smoothing 4 OK Changes the items in this dialog and closes the box 5 Cancel Closes the box without changing its items 6 Restore Defaults Resets the values in the More Options dialog to the default values 7 Help Opens the Help topics CHAPTER 1 1 40 More Optio...

Page 49: ...w is open and then restart the Windows The Printer Status Window dialog box is shown in Figure 1 7 27 Figure 1 7 27 1 Icon Displays 5 icons according to the situation 2 Message area Displays brief messages indicating the printer status 3 Error message area Displays error status and action procedures when an error has occurred 4 Progress bar Displays the progress of an ongoing printing job 5 Job In...

Page 50: ...tons the Pause Job button Resume job button and Delete job button 8 Status bar Displays the printer port to which the printer is connected When performing a menu operation it displays the status relating to its menu CHAPTER 1 1 42 ...

Page 51: ...the Status Options dialog box 2 Port Setting Opens the Port Setting dialog box 3 Cleaning Prints a cleaning page Refer to Chapter 2 on Page 2 15 CHAPTER 1 1 43 Canon LBP 800 Status Options Port Setting Cleaning X Document name User name Computername Estimated time left Estimated finish time Printing Job Title Printed Job i Waiting Job Job Options Help Contents LPT1 1 3 2 ...

Page 52: ...en by bi directional com munication 3 Status check group Selects either to check the printer status regularly or only during printing 4 Always On Top Displays the Status Window on top on the screen when checked 5 OK Changes the items in this dialog box and closes the box 6 Cancel Closes the dialog box without changing its items 7 Help Opens the Help topics CHAPTER 1 1 44 Status Options Cancel Help...

Page 53: ...ndow It can be opened only when the printer is connected to the local parallel port The Port Setting dialog box is shown in Figure 1 7 30 Figure 1 7 30 1 Port Setting Sets the Port s 2 OK Changes the items and closes the dialog box 3 Cancel Closes the dialog box without changing its items CHAPTER 1 1 45 Port Setting X OK Cancel Standard ECP without DMA ECP with DMA Port Setting 1 2 3 ...

Page 54: ... the Canon LBP 800 Trouble Shooter icon in the Windows Printing System group Trouble Shooter Dialog Box starting up The following dialog box appears when the Trouble Shooter is started Figure 1 7 31 1 System Information Displays the system information of the PC Free Disk Space and Free Memory 2 Printers Selects the printer that performs the Trouble Shooter 3 Yes Executes the Trouble Shooter 4 No E...

Page 55: ...indows NT Checks the language monitor Checks the printer driver Checks the Status Window Checks each item of the Printer Property Checks the Program Folder Checks the Network Checks the Network server Checks the network printer Checks the reconnection of the port only Microsoft Windows 95 98 The Trouble Shooter displays an error message with available information when it encoun ters a problem Make...

Page 56: ...ndard 5 OK Exits the Trouble Shooter If problems remain uninstall CAPT and reinstall it after rebooting the PC CHAPTER 1 1 48 i i OK Canon LBP 800 Trouble Shooter Canon LBP 800 on LPT1 local trouble shooting 4 5 99 2 19 55 AM Free Disk Space 23MB Free Memory 0KB LPT1CECPStandard parallel port All files are expected versions Canon LBP 800 is connected to LPT1 LPT1 port driver is working properly Re...

Page 57: ... or above Available disk space 15 MB or above Printer port Standard Centronics parallel port CD ROM drive Sound PCM sound module is required to use the sound Monitor size 640 x 480 or above 16 colors or above Network 10 Base T or 100 Base TX is required to use the network adapter Recommended Operating Environment CPU MMX Pentium 200 MHz or above RAM 24 MB or above OS software This printer operates...

Page 58: ...t box and click the Browse button 5 Add Printer Wizard Printer selection 2 When the name of this printer appears in the Printers list box confirm that it is selected and then click the Next button When you want to change the printer to be installed click the Have Disk button to reselect the INF file 6 Add Printer Wizard Overwrite selection This window appears only when the same driver has already ...

Page 59: ...5 98 and log in 2 Use one of the following methods to start up the Add Printer Wizard Start button Settings Printers Printers folder Open the Add Printer My computer Printers folder Open the Add Printer Explorer Desktop My computer Printers Open the Add Printer 3 Add Printer Wizard Initial screen Select either to use this printer as a local printer or network printer The following proce dures desc...

Page 60: ... and select the Properties in the Printer menu From the Microsoft Windows applications How to open the Printer Properties varies in each application See the application manual From the Microsoft Windows Shortcut To create a shortcut open the Printers folder drag the Canon LBP 800 icon to the desk top pressing the CTPL key See the Microsoft Windows 95 98 User s Guide for details Double click on the...

Page 61: ...the Print Properties dialog box To close the box without storing the items set in each tab click the Cancel button Figure 1 7 34 1 OK Changes the items in this dialog box and closes the box 2 Cancel Closes this dialog box without changing its items 3 Apply Changes the items and continues the Property dialog Details of each tab are described below For operation and displays of the common tabs Gener...

Page 62: ...ge Size 7 Page Layout Specifies the number of page printed per print sheet When you specify the 2 4 8 9 Pages per Sheet the Manual Scaling will disappear and Page Order will be dis played 8 Orientation Sets the printing orientation 9 Copies Sets the number of printing 10 Output Size Sets the paper size Physically 11 Page Size Sets the paper size Theoretically CHAPTER 1 1 54 Canon LBP 800 Propertie...

Page 63: ...ser defined paper 4 Page Size Specifies the size of user defined paper according to the unit selected in the Units 5 OK Changes the items in the Custom Paper Size dialog box and closes the box 6 Cancel Closes the box without changing its items 7 Restore Defaults Resets the values in the Custom Paper Size dialog box to the default val ues 8 Help Open the Help topics CHAPTER 1 1 55 Custom Paper Size...

Page 64: ...ettings Opens the View Settings dialog box 3 Preferences Opens the Preference dialog box 4 Restore Defaults Resets the values in the Page Setup dialog box to the default values 5 Collate Specifies either to print in collate or page CHAPTER 1 1 56 Canon LBP 800 Properties General Details Page Setup Finishing Quality Letter View Settings Scaling Auto Collate Preferences OK Cancel Apply X Add Edit Pr...

Page 65: ...aper size specified by the printer driver you can specify either to continue printing it ignoring the difference of the paper sizes or to require the user to change the paper 2 OK Changing the items in the dialog and closes the box 3 Cancel Closes this dialog box without changing its items 4 Restore Defaults Resets the values in the Preferences dialog box to the default values 5 Help Open the Help...

Page 66: ...5 Resolution Specifies the Resolution 6 Halftoning Specifies the Halftone form 7 Brightness Adjusts 80 to 80 of brightness 8 Contrast Adjusts 80 to 80 of contrast 9 Restore Defaults Resets the values in the Quality tab to the default values CHAPTER 1 1 58 Brightness Canon LBP 800 Properties General Details Page Setup Finishing Quality Letter View Settings Scaling Auto Halftoning More Options OK Ca...

Page 67: ... settings If errors are found the Trouble Shooter reports the errors to the user and self corrects if possible The Trouble Shooter cannot detect problems regarding the hardware such as printer cable and parallel port failure It does not operate on the Network client PC For details refer to Page 1 46 to 1 48 CHAPTER 1 1 59 ...

Page 68: ......

Page 69: ...Page per Sheet 2 Pages per Sheet 4 Pages per Sheet 8 Pages per Sheet 9 Pages per Sheet 10 100 200 2 Pages per Sheet Portrait 2 Pages per Sheet Landscape 4 8 9 Pages per Sheet Setup item Overlay Placement Position Size Unit Setup Value Background Foreground Centimeters Inches Left Top Width Height 0 X 34 00cm 0 X 34 00cm 0 X 34 00cm 0 X 34 00cm Setup item Resolution Halftorning Brightness Contrast ...

Page 70: ...Windows NT x86 Monitor CAPT Monitor Default Datatype RAW Files used by this driver C WINNT40 System32 spool DRIVERS W32X86 2 CAPSMN DLL 1 00 0 015 C WINNT40 System32 spool DRIVERS W32X86 2 CAPMONN DLL 1 00 0 015 C WINNT40 System32 spool DRIVERS W32X86 2 CAPRPCSN EXE 1 00 0 015 C WINNT40 System32 spool DRIVERS W32X86 2 CAPEMN DLL 1 00 0 015 C WINNT40 System32 spool DRIVERS W32X86 2 CAPPTMN DLL 1 00...

Page 71: ...Pages per Sheet Landscape 4 8 9 Pages per Sheet Setup item Units Paper Sizes Setup Value Centimeters Inches Setup item Overlay Placement Position Size Unit Setup Value Background Foreground Centimeters Inches Left Top Width Height 0 X 34 00cm 0 X 34 00cm 0 X 34 00cm 0 X 34 00cm Setup item Resolution Halftorning Brightness Contrast Setup Value 600dpi 300dpi Pattern 1 Pattern 2 Smooth 80 0 80 80 0 8...

Page 72: ... your printer driver and port settings Printer name Canon LBP 800 Printer model Canon LBP 800 Driver name CAP1 DRV Driver version 4 00 Color support No Port name LPT1 Data format EMF Files used by this driver C WIN98 SYSTEM CAP1 CNT C WIN98 SYSTEM CAP1 DRV 1 00 0 015 C WIN98 SYSTEM CAP1 HLP C WIN98 SYSTEM CAP1 TXT C WIN98 SYSTEM CAP1APP INF C WIN98 SYSTEM CAP1INS INF C WIN98 SYSTEM CAP1PM DLL 1 00...

Page 73: ... being output A signal that is L or has a slash in front of its name is active at ground level and inac tive at the supply voltage level There is a microcomputer in this printer But as the internal operation of the microcom puter cannot be checked an explanation of the operation of the microcomputer has been left out As it is assumed that no repair will be made to customer circuit boards the expla...

Page 74: ......

Page 75: ...To external device host computer etc PICK UP FEED SYSTEM 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 tra...

Page 76: ...om the input of the pick up command from the interface controller until the paper reaching the paper top sensor From the end of the initial rotation until the primary voltage going OFF From the primary voltage going OFF until the main motor discontinue rotating STBY STANDBY INTR INITIAL ROTATION period PRINT Print LSTR LAST ROTATION period To keep the printer ready to print To stabilize the photos...

Page 77: ...5 Fixing unit ON The fixing unit is driven for 0 5 seconds The printer stops driving the fixing unit if the detected fixing unit temperature is 100 C or more 6 Scanner motor initial rotation 7 Main motor initial rotation 8 High voltage control Presence or absence of the cartridge is detected after the primary high voltage goes ON The transfer charging roller is cleaned 9 Failure abnormality check ...

Page 78: ...mmand and image data input from the interface controller A block diagram of this circuit is shown below Figure 2 2 1 CHAPTER 2 2 4 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 Sequenc...

Page 79: ...voltage power supply circuit control 4 Laser scanner control 5 Sensor control 6 Control of loads such as motors and solenoids 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 Lo...

Page 80: ...n 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 The scanner motor accelerates when L 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...

Page 81: ...701 J101 1 2 HOT J204 1 SW301 Door open detection switch SW101 NEUTRAL Fixing film unit J009 2 J008 2 1 1 2 SW201 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 to rotate the pick up roller Engine controller PCB AC power input Fixing heater temperature detection signal ...

Page 82: ... controlled in three modes 1 Initial temperature control The fixing heater temperature is increased to its normal target temperature value after the pick up command is input to the engine controller 2 Normal temperature control The fixing heater temperature is controlled to be its normal tar get temperature value during printing 3 Between page temperature control The fixing heater temperature is c...

Page 83: ...g fixing heater error The CPU assesses a fixing heater failure and notifies the interface controller of the failure under the following conditions a The temperature of 20 C or above is not detected within 500 msec after the start of initial temperature control b The temperature remains above 220 C for more than the specified period of time during fix ing heater temperature control c The temperatur...

Page 84: ...cording to the image density data sent from the interface controller CHAPTER 2 2 10 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 28 32 33 37 DC voltage generation circuit AC voltage generation circuit Developing bias circuit DC voltage generation circuit AC volta...

Page 85: ... toner adhered to the roller onto the pho tosensitive drum The print bias positive voltage is applied to the transfer charging roller in order to transfer the toner on the photosensitive drum onto the paper The between page bias positive voltage lower than the print bias is applied with the speci fied timing to prevent the residual toner on the photosensitive drum from adhering to the trans fer ch...

Page 86: ...roller PCB BD PCB and interface controller PCB 5VDC is supplied to the ICs on the engine controller PCB laser scanner driver PCB inter face controller PCB and sensors 24VDC is supplied to the high voltage power supply circuit main motor scanner motor and solenoids Figure 2 2 6 CHAPTER 2 2 12 24VU 5V 5V 5V 24V 24V 5V 24V 5V 24V 24V 3 3V 3 3V Inlet Fixing heater Main motor Solenoid High voltage powe...

Page 87: ...age to pro tect the circuits when overcurrent or abnormal voltage results from troubles such as a short on load When these protective functions are activated and no DC voltage is output from the power supply circuits turn OFF the power rectify the troubles on the loads and then turn ON the power again Wait about two minutes after turning OFF the power before turning it ON again CHAPTER 2 2 13 ...

Page 88: ...d inter face controller and gives information of the sequence of printer operation using the interface sig nals a System diagram Figure 2 2 7 b Video interface signals Figure 2 2 8 CHAPTER 2 2 14 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 ...

Page 89: ... to send back the 16 bit serial data as a status The command and status sent from the interface controller and the engine controller respec tively are synchronized with the SYNCHRONIZE CLOCK signal SCLK output from the inter face controller When the interface controller initiates the communication with the engine con troller the interface controller outputs the data to the SC signal synchronizing ...

Page 90: ... laser diode passes though collimator lens and cylindrical lens and then strikes the four faced scanning mirror rotating at a constant speed The beam reflected from the four faced scanning mirror passes through focusing lens and is reflected onto the photosensitive drum When the photosensitive drum rotates and at the same time the laser beam scans across its surface at a constant speed the laser b...

Page 91: ... stated in the following section When both CNT0 and CNT1 signals are H the laser driver enters the masking mode Regardless the VIDEO signals VDO VDO the laser driver prohibits the laser diode from emit ting the laser beam When CNT0 and CNT1 signals are H and L respectively the laser driver enters the unmasking mode to turn the laser ON OFF according to the VDO VDO signals from the inter face contr...

Page 92: ...controls the horizontal sync control based on the HORIZONTAL SYNC INPUT signal BDI sent from the BD sensor in the laser scanner The CPU turns CNT0 and CNT1 into L and H respectively and the laser diode emits the laser beam at the specified timing based on the BDI signal The laser beam passes through collimator lens and cylindrical lens Then the laser beam is scanned by the four faced mirror to pas...

Page 93: ...tput to the trailing edge of the paper When the number of BD pulse lines number of scan lines is specified with a scan line number specification command from the interface controller the trailing edge of the T2 is where the BD output for the specified number of scan lines completes When the number of scan lines is not specified the trailing edge of the T2 is where the paper top sensor PS002 detect...

Page 94: ...ith a fre quency comparator in the CPU In order to generate the specified number of the scanner motor rotation the CPU controls the rotation by outputting the ACC signal and the DEC signal In 1 5 seconds after the number of the scanner motor rotation reaches the specified value the scanner becomes ready The CPU monitors the BDI signal sent from the BD PCB to determine whether the scanner motor is ...

Page 95: ... pletion of scanner motor forced acceleration or when the detected BDI cycle is not equal to the specified value for 2 continuous seconds or more after the scanner has become ready 3 BD error The CPU assesses a BD error when the BDI is not detected at the specified cycle while the BD is output to the interface controller from the engine controller The CPU does not report the BD error to the interf...

Page 96: ...image with the laser diode on the photosensitive drum the laser beam modulated by the VIDEO signal is illuminated on the photosensitive drum surface The latent image formed on the photosensitive drum is changed to a visible image by the toner on the developing cylinder and then transferred onto the paper by the transfer charging roller The residual toner on the photosensitive drum surface is scrap...

Page 97: ...d an inter nal aluminum 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 Development 3 Transfer stage Step 4 Transfer Step 5 Separation 4 Fixing stage Step 6 Fixing CHAPTER 2 2 23 Cleaning blade Cartridge Blade Static charge eliminator Photosensit...

Page 98: ...e charges on the drum is invisible to eyes it is called an electro static latent image Figure 2 4 5 CHAPTER 2 2 24 Drum cleaning stage Transfer stage Electrostatic latent image formation 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 Mul...

Page 99: ...tial on the drum surface uniform The DC bias changes with the developing DC bias that changes according to the IMAGE DEN SITY DATA signal 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 surface of the photosensitiv...

Page 100: ...ingle 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 Wh...

Page 101: ...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 the paper feed system and t...

Page 102: ...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 pre vents dispersion of the toner particles This printer utilizes an on demand method which uses fixing film with small heat capacity This method can heat the roller quickly and does not ...

Page 103: ...t operation to obtain crisp image 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 con tainer CHAPTER 2 2 29 Cleaner container Sweeper strip Photosensitive drum Cleaning blade ...

Page 104: ...te the plate is lifted with the spring force A sheet of the paper pushed up by the lifting plate is picked up by the pick up roller and trans ferred into the printer The paper pick up timing is the same for the multi purpose tray and the manual feed slot If the both pick up sources are loaded with paper priority is given to the man ual feed slot Figure 2 5 1 CHAPTER 2 2 30 PS201 PS001 Feed roller ...

Page 105: ...pass each sensor within the specified period of time the CPU on the engine controller assumes paper jam has occurred and notifies the interface controller of the jam Since this printer loads paper from the top a few papers or a curled paper may not be picked up The printer has a pick up retry function If the paper top sensor cannot detect the leading edge of paper within the specified period of ti...

Page 106: ...n 3 2 seconds after the paper top sensor PS002 detects the lead ing edge of the paper 4 Wrapping jam The CPU assesses a wrapping jam if the paper delivery sensor PS201 detects the trailing edge of the paper within 2 4 seconds after the paper top sensor PS002 detects the trailing edge of the paper 5 Delivery stationary jam The CPU assesses a delivery stationary jam if the paper delivery sensor PS20...

Page 107: ...ce controller is shown in Figure 2 6 1 and the block diagram in Figure 2 6 2 2 Function of Blocks a CPU IC1 The main functions of CPU IC1 are 1 To control the video interface and parallel interface Centronics specification 2 To process the serial commands of the video interface b DRAM IC2 DRAM has a memory capacity of 512 KB and stores the following information 1 Dot data converted from the image ...

Page 108: ...IC2 IC3 IC1 Cellbase IC CPU DRAM Bi Directional Parallel I F X tal Printer Engine SCIN SCLKIN SCOUT AD 7 0 WR_N RD_N ALE CPUCLK CPURST_N BDOUT_N SCLK SC nBD nRESET nVDO VDO nSELIN nERROER nINTT nAUTOFD SELECT PERROR BUSY nACK DATA 7 0 nSTROBE DRA 9 0 CAS_N MD 7 0 RAMWR_N RAS_N ...

Page 109: ...CHAPTER 3 THE MECHANICAL SYSTEM I PREFACE 3 1 II EXTERNALS 3 2 III MAIN UNITS 3 5 IV MAIN PARTS 3 10 V SWITCHES SENSORS LEDS 3 15 VI MOTOR SOLENOID 3 17 VII PCBs 3 19 ...

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Page 111: ...nt the adverse effect of light 2 CAUTION Before servicing the printer disconnect its power cord from the electri cal 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 reassem bling the printer be sure to use them in their original locations 5 Do not operate the printer with any parts removed 6 Dis...

Page 112: ... 1 When cleaning checking or repairing inside the printer follow the procedures to remove the covers as required B External Covers 1 Lobe 1 Unhook the 2 claws and then turn the lobe right in the direction of the arrow to remove Claws Lobe right Figure 3 2 2 2 Remove the lobe left in the same way CHAPTER 3 3 2 ...

Page 113: ...cover unit in the same way 4 Unhook the claw with a precision slot head screw driver and then remove the deflector pulling it toward you Claw Deflector Figure 3 2 4 Note for reassembly Paper should be delivered face up when the delivery switching lever is down 5 Remove the 2 screws and then slide the cartridge cover unit in the direction of the arrow to remove Screws Cartridge cover unit Figure 3 ...

Page 114: ...he rear cover by lifting it Screws Rear cover Figure 3 2 6 4 Front cover 1 Remove the rear cover 2 Remove the 2 screws and pull the lower part of the front cover to the right and left Remove the front cover by lifting it Screws Front cover Figure 3 2 7 5 Multi purpose tray 1 Remove the rear cover 2 Remove the multi purpose tray CHAPTER 3 3 4 ...

Page 115: ...isplay unit Connector Cable guides Cable Screws Display unit Figure 3 3 1 4 Remove the 2 screws then the right and left covers Screws Covers Figure 3 3 2 5 Remove the 2 screws and 2 claws then the duct Screws Claws Duct Figure 3 3 3 6 Remove the sponge Sponge Figure 3 3 4 Note for reassembly Make sure to confirm the sponge attached when installing the duct CHAPTER 3 3 5 ...

Page 116: ...ors Cable guides Cable Screws Laser scanner unit Note Do not disassemble the laser scan ner unit as it cannot be adjusted in the field B Drive Unit 1 Remove the external covers 2 Disconnect the connector from the back of the printer Figure 3 3 6 Connector 3 Remove the 4 screws and then the drive unit Screws Drive unit Figure 3 3 7 CHAPTER 3 3 6 ...

Page 117: ...gine controller unit 2 Unhook the 2 claws and remove the 2 gears and the spring Claws Gears Figure 3 3 8 3 Pressing the 2 claws remove the bush ing Claws Bushing Figure 3 3 9 4 Remove the 2 screws disconnect the 2 connectors and then remove the feed unit Screws Connectors Feed unit Figure 3 3 10 CHAPTER 3 3 7 ...

Page 118: ...gure 3 3 11 3 Remove the 2 screws Then slide the delivery unit to the right to remove Screws Delivery unit Figure 3 3 12 E Fixing Film Unit 1 Remove the external covers 2 Remove the delivery unit 3 Make sure that the pressure release lever is up Slide the right and left fixing pressure units inward by pushing down on them Pressure release lever Fixing pressure units Figure 3 3 13 4 Disconnect the ...

Page 119: ...5 Disconnect the connector and remove the cable from the cable guides 6 Remove the fixing film unit Connector Cable guides Cable Fixing film unit Figure 3 3 15 CHAPTER 3 3 9 ...

Page 120: ...IV MAIN PARTS A Locations Pick up roller Separation pad Transfer charging roller Pressure roller Figure 3 4 1 CHAPTER 3 3 10 ...

Page 121: ...ation Pad 1 Performing the laser scanner unit removal procedures 1 through 5 on page 3 5 remove the duct 2 Performing the drive unit removal pro cedures on page 3 6 remove the drive unit 3 Remove the claw to slide the pick up roller shaft to the left Claw Pick up roller shaft Figure 3 4 3 4 Remove the sponge of the laser scan ner unit CHAPTER 3 3 11 ...

Page 122: ...on the back of the printer by sliding it upward Pad fixture Figure 3 4 5 7 Moving the lifting plate unit in the direction of the arrow remove the sep aration pad Lifting plate unit Separation pad Figure 3 4 6 8 Remove the spring from the separation pad Note for reassembly Make sure to set the spring securely when installing the separate pad lifting plate unit CHAPTER 3 3 12 ...

Page 123: ...igure 3 4 7 Note Hold the shaft of the transfer charging roller Do not hold the sponge area E Pressure Roller 1 Performing the drive unit removal pro cedures on page 3 6 remove the drive unit 2 Performing the fixing unit removal pro cedures on page 3 8 remove the fixing film unit 3 Remove the 2 screws and then the fix ing entrance guide 4 Remove the holder Screws Fixing entrance guide Holder Figur...

Page 124: ...ng bias contact unit by pulling it toward you Claws Fixing bias contact unit Figure 3 4 9 6 Remove the gear Lift up the right shaft and slide it to the right to remove the pressure roller Gear Pressure roller Figure 3 4 10 CHAPTER 3 3 14 ...

Page 125: ...rint 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 Display unit LED Display PCB Figure 3 5 1 CHAPTER 3 3 15 PS003 PS201 SW101 SW301 SW201 LED601 PS002 ...

Page 126: ...t sensor Paper top sensor Paper out sensor Figure 3 5 2 C Power Switch Test Print Switch Door Open Detection Switch Paper Delivery Sensor 1 Performing the engine controller PCB removal procedures on page 3 21 remove the engine controller PCB D Display Unit LED 1 Performing the display PCB removal procedures on page 3 23 remove the display PCB CHAPTER 3 3 16 ...

Page 127: ...VI MOTOR SOLENOID A Locations M001 Main motor SL001 Pick up solenoid Figure 3 6 1 CHAPTER 3 3 17 SL001 M001 ...

Page 128: ... the 2 screws and then the main motor C Pick up Solenoid 1 Performing the drive unit removal pro cedures on page 3 6 remove the drive unit 2 Disconnect the connector from the engine controller PCB remove the screw and then the pick up solenoid Connector Screw Pick up solenoid Figure 3 6 2 CHAPTER 3 3 18 ...

Page 129: ...VII PCBs A Locations Interface controller PCB Engine controller PCB Display PCB Figure 3 7 1 CHAPTER 3 3 19 ...

Page 130: ... unit Figure 3 7 3 3 Disconnect the 2 connectors and remove the interface controller unit Connectors Interface controller unit Interface controller PCB Figure 3 7 4 4 Remove the 4 screws and then the interface controller PCB Note for reassembly Make sure to install each of the two con nectors in the right positions when installing the interface controller unit CHAPTER 3 3 20 ...

Page 131: ...nector Figure 3 7 5 4 Remove the screw on the right of the printer and disconnect the connector Screw Connector Figure 3 7 6 5 Remove the two screws on the back of the printer and disconnect the two con nectors Screws Connectors Figure 3 7 7 6 Remove the 2 screws Pull out the engine controller unit toward you to disconnect the 2 connectors on the engine controller PCB Remove the engine controller ...

Page 132: ...ler PCB Figure 3 7 9 a Fuses 1 Performing the engine controller PCB removal procedures 1 through 6 on page 3 21 remove the engine controller unit 2 Remove the fuses Fuses Figure 3 7 10 Note Make sure to install each fuse in the right position when installing them Figure 3 7 11 CHAPTER 3 3 22 No red mark FU101 With red mark FU102 ...

Page 133: ...move the external covers 2 Remove the 2 screws disconnect the connector and then remove the display unit Screws Connector Display unit Display PCB Figure 3 7 12 3 Remove the screw and then the display PCB CHAPTER 3 3 23 ...

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Page 135: ...ECTS 4 6 III JAMS TROUBLESHOOTING 4 12 IV TRANSPORT TROUBLESHOOTING 4 15 V MALFUNCTION TROUBLESHOOTING 4 16 VI MALFUNCTION STATUS TROUBLESHOOTING 4 17 VII MEASUREMENT AND ADJUSTMENT 4 20 VIII MAINTENANCE AND SERVICING 4 22 IX LOCATION OF CONNECTORS 4 27 ...

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Page 137: ...art 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 speci fied terminal of the connector Before handling PCBs be sure to touch metal part of the printer to discharge static elec tricity as it can cause damage to t...

Page 138: ...efer to the item image defects Refer to the item malfunction status troubleshooting END Do you make test print Note 1 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 Yes No No Yes No Yes Yes No Displays operator call or service call No Yes ...

Page 139: ...formation 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 out put image Then find the factor according to the item image defects CHAPTER 4 4 3 ...

Page 140: ...s not moist 3 Loading paper into the pick up source a The stack of paper loaded into the pick up source should be within the specified capacity of the source b The paper is set in the selected pick up 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 a...

Page 141: ...2 When the printer is in the STANDBY mode press the test print switch with the arrow point ing in Figure 4 1 2 in the hole with a precision slot head screw driver and print a test print shown in 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 defects Test pattern can be printed continuously as long as the t...

Page 142: ...r charging roller 4 Poor contact in the transfer charging 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 CHAPTER 4 4 6 2 1 Light 2 2 Dark 2 3 Completely blank 2 4 All black 2 5 Dirt on back of paper 2 6 Dirt 2 7 Black vertical line...

Page 143: ... are deformed or damaged replace them 4 Defective laser scanner unit Action Replace the laser scanner unit 5 Defective engine controller 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 a...

Page 144: ...e Action Identify and clean the dirty part s according to Table 4 2 2 on page 4 11 If the dirt cannot be removed replace the dirty part s 2 Dirty face down delivery sub roller or fixing delivery sub roller Action Clean the face down delivery sub roller or fixing delivery sub roller II 7 Black vertical lines Possible causes 1 Circumferential scars on the photosensitive drum Action Replace the cartr...

Page 145: ...e fixing film unit Action Replace the fixing film unit 8 Dirty mirror in the laser scanner unit Action Replace the laser scanner unit II 9 Black horizontal lines Possible causes 1 Horizontal scar s on the photosensitive drum Action Replace the cartridge 2 Dirty deformed or worn fixing film Action Replace the fixing film unit II 10 White horizontal lines Possible causes 1 Horizontal scar s on the p...

Page 146: ...xing film unit 5 Deterioration of the thermistor Action Replace the fixing film unit II 13 Image distortion Possible causes 1 Poor contact in the connectors on the laser scanner unit Action Reconnect 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 co...

Page 147: ...charging roller Period of the image mm Blank spots 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 Approx 45 Approx 75 Approx 63 Approx 52 Approx 75 Approx 38 Approx 38 Periodical dirt and spots appearing on the image ...

Page 148: ...nction diagnosis flowchart Figure 4 1 1 If a jams is found the defective part must be located and rectified by the following procedure The paper route can be divided into two sections 1 paper pick up and feed unit and 2 fix ing and delivery unit Figure 4 3 1 CHAPTER 4 4 12 ...

Page 149: ... in the connectors on the pick up roller solenoid drive signal line Action Reconnect connector J204F on the engine controller PCB 7 Defective pick up roller solenoid Action Disconnect connector J204F on the engine controller PCB Measure the resistance value between connector J204 1 and J204 2 on the cable If the measured value is not about 120 Ω replace the pick up roller solenoid 8 Defective pape...

Page 150: ... lever if damaged 7 Defective paper delivery sensor lever spring Action Set the spring in the right position if out of place 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 roller is worn replace it 9 The face down delivery roller does not rotate smoothly Action Check the gears an...

Page 151: ...worn IV 2 Wrinkles Folded leading edge Possible causes 1 Paper dust and dirt accumulated on the pick up 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 dirty paper gu...

Page 152: ...oller PCB V 2 No DC power Possible causes 1 No AC power is supplied Action Make a check according to 5 1 No AC power 2 Overcurrent overvoltage detection circuit activated Action If the problem is not rectified after the power switch is turned OFF and then ON again find the cause of activation of the overcurrent overvoltage detection circuit in the power supply unit Wait for two minutes or more bef...

Page 153: ...e engine controller PCB Action Replace the engine controller PCB VI 2 Fixing unit failure Possible causes 1 Poor contact in the connectors Action Reconnect connector J206F on the engine controller PCB 2 Broken wire or short circuited thermistor Action Turn OFF the power and remove the fixing unit from the printer Measure the resistance between connector J009 1 and J009 2 of the fixing unit If the ...

Page 154: ...n switch Action Replace the door open detection switch SW301 4 Defective engine controller PCB Action Replace the engine controller PCB VI 5 The printer cannot enter the READY mode and the paper out status is output although paper is set Possible causes 1 Defective paper out sensor lever Action Replace the paper out sensor lever if damaged 2 Defective paper out sensor Action Replace the paper out ...

Page 155: ...2 Defective cartridge Action Replace the cartridge 3 Defective engine controller PCB Action Replace the engine controller PCB CHAPTER 4 4 19 ...

Page 156: ... the printed side facing down 3 Select face up delivery by shifting the delivery switching lever downward 4 Press the test print switch 5 Turn OFF the printer when the leading edge of the print emerges at the face up tray Open the top cover and take out the print about 10 seconds later 6 Measure the width of the glossy band across the paper and check that it meets the require ments as shown in Fig...

Page 157: ...e 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 CHAPTER 4 4 21 J401 J204 2 1 SW201 1 2 J205 1 6 J201 1 19 4 1 J206 1 2 SW301 J208 1 12 J211 1 6 J102 1 2 SW201 SW No Function Switch for test print SW301 Switch for door open detection ...

Page 158: ...r 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 printer s warranty period They only need to be r...

Page 159: ...D Cleaning During a Service Visit Fixing unit entrance guide Pick up roller Separation pad Transfer charging roller Figure 4 8 1 CHAPTER 4 4 23 ...

Page 160: ...lean with dry lint free paper 3 Separation pad Clean the rubber area with 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 dry lint free paper Do not use water or solvent Make sure not to contaminate the roller with solvent or oil CHAPTER 4 4 24 ...

Page 161: ...ting pliers Needle nose pliers Pliers Retaining ring pliers Crimper Tweezers Ruler Soldering iron Mallet plastic head Brush Penlight Plastic bottle 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 ...

Page 162: ... 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 163: ...IX LOCATION OF CONNECTORS Figure 4 9 1 CHAPTER 4 4 27 Å J208 J211 J003 J802 J801 J102 J702 J703 J008 J901 J401 J007 J601 J206 J002 J201 J204 J2 ...

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Page 165: ...APPENDIX I GENERAL TIMING CHART A 1 II GENERAL CIRCUIT DIAGRAM A 3 III LIST OF SIGNALS A 5 IV MESSAGES TABLE A 7 ...

Page 166: ......

Page 167: ...6 0 9 3 3 3 2 1 0 1 5 0 5 0 3 3 5 2 1 2 4 0 2 0 9 2 1 100 C control Note2 3 1 6 6 0 4 0 5 0 4 0 2 0 5 1 0 2 2 0 4 0 6 0 5 3 0 0 2 Forced emission 3 BD lines 3 0 0 2 0 8 Note1 Power ON Sequence Print temperature control 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...

Page 168: ......

Page 169: ...nit 2 1 2 1 J702F J702M H701 FU701 J007F CLK SO SI STRB GND 5V 24V ACC DEC GND 5V GND VDO VDO CNT1 CNT0 BDI 3 3V GND 24VM 24VM 24VM GND 24VM GND 3 3V 5V GND SCLK SC BD RESET VDO VDO GND GND 5V 3 3V 3 3V GND HOT NEUTRAL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 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 1...

Page 170: ...9 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 GND GND GND GND GND GND GND GND GND GND GND GND INIT FAULT N C N C N C SELECTIN J1 Pararell Interface Connector To host computer J2 Interface Controller PCB 1 2 5V GND J3 To display panel 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 ...

Page 171: ...DO I L VIDEO signal 15 GND 16 GND 17 5V 18 3 3V 19 3 3V 20 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 DCC O L SCANNER DECELERATION signal 4 GND 5 5V 6 GND 7 VDO O L VIDEO signal 8 VDO O L VIDEO signal 9 CONT1 O H LASER CONTROL signal 10...

Page 172: ...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 Connector Pin Abbreviation I O Logic Signal name ...

Page 173: ... and the status and procedures are displayed in the Error message area Idling status Printing status Status not available Error status Figure A 4 1 For the details of the status window see Chapter 1 on Page 1 50 APPENDIX A 7 Canon LBP 800 Printer Raedy X Document name User name Computername Estimated time left Estimated finish time Title Printed Job i Waiting Job Job Options Help Contents LPT1 Mes...

Page 174: ...lowing 4 messages are indicated for the printing status Message area Printing Error message area None Indicated regularly Message area Printing Paused Error message area None Indicated when the Pause Job button is clicked during printing Message area Stopping Error message area None Indicated when the Delete Job button is clicked during printing Message area Cleaning Error message area None Indica...

Page 175: ...other device Indicated when the port is being used by another device Message area Network Adapter Error Error message area Network adapter or the printer isn t turned on Indicated when the network adapter or printer is not turned on or the printer itself does not exist Message area Check Printer Cable Error message area Check the following Is the printer switched on Is the printer cable con nected...

Page 176: ...orce to print on yyy Indicated when the paper to be printed that the driver detects differs from the specified paper If switched to the specified paper the printer resumes printing automatically If the Resume Job button is clicked the printer resumes printing with the present paper Message area Add xxx Paper Error message area No paper loaded in printer Indicated when paper is not set Message area...

Page 177: ...pared by PERIPHERAL PRODUCTS QUALITY PLANNING DIV PERIPHERAL PRODUCTS TECHNICAL DOCUMENTATION DEPT CANON INC Printed in Japan REVISION 0 AUG 1999 5 1 Hakusan 7 chome Toride City Ibaraki Pref 302 8501 Japan ...

Page 178: ...The printing paper contains 70 waste paper PRINTED IN JAPAN IMPRIME AU JAPON 0899AB0 50 CANON INC ...

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