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Canon LBP-2000 Service Manual

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SERVICE
MANUAL
REVISION 0
FY8-13HQ-000
AUG. 2001
    
COPYRIGHT
2001 CONON INC.
CANON LBP-2000 REV.0 AUG.2001

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Table of Contents

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   Summary of Contents for Canon LBP-2000

  • Page 1: Service Manual

    SERVICE MANUAL REVISION 0 FY8-13HQ-000 AUG. 2001      COPYRIGHT 2001 CONON INC. CANON LBP-2000 REV.0 AUG.2001...
  • Page 2 COPYRIGHT © 2001 CANON INC Use of this manual should be strictly supervised to avoid disclosure of confi- dential information.
  • Page 3 PREFACE INTRODUCTION This Service Manual provides basic facts and figures needed to service the laser beam printer LBP- 2000 (hereafter, the Printer), performed to ensure initial product quality and performance. The following options may be used in combination with the Printer: •...
  • Page 4: Table Of Contents

    PREFACE CONTENTS CHAPTER 1 PRODUCT OUTLINE FEATURES ......1-1 Points to Note About SPECIFICATIONS ..... 1-2 Installation ....... 1-9 Printer ......1-2 Selecting the Site ..... 1-9 Options ......1-4 Unpacking and Installing .. 1-11 III. SAFETY ........1-5 When Storing or Handling Safety of the Laser Unit ..
  • Page 5 PREFACE CHAPTER 3 MECHANICAL SYSTEM EXTERNALS AND CONTROLS ... 3-1 Multifeeder Tray Pickup External Covers ....3-1 Assembly ......3-20 Heat Discharging Fan ..3-4 Registration Roller Door Switch Assembly ..3-5 Assembly ......3-23 PCBS ........3-8 EXPOSURE MECHANISMS ..3-25 Arrangement of the PCBs ..
  • Page 6 CHAPTER 1 PRODUCT OUTLINE FEATURES ......1-1 VI. RELOCATING THE PRINTER ..1-21 SPECIFICATIONS ..... 1-2 VII. ROUTINE MAINTENANCE/ III. SAFETY ........1-5 INSPECTION BY THE USER ..1-22 NAMES OF PARTS ....1-6 VIII. USING THE PRINTER ....1-25 INSTALLATION ......
  • Page 7: Features

    This printer supports the Hewlett-Packard’fs PCL5e and PCL-XL printer language. Also, Adobe PostScript 3 can be provided by installing the optional Canon Adobe PostScript 3 Module A-65. This enables auto emulation switching for PCL and PostScript based on the received data.
  • Page 8: Specifications

    CHAPTER 1 II. SPECIFICATIONS A. Printer 1. Printer engine 1) Type Desktop page printer 2) Printing method Electrophotostatic 3) Printing speed (Note 1) 20 pages/min (A4, horizontal), 11 pages/ min (A3) 4) First print time (Note 2) 11.0 sec (approx.; A4, horizontal) 5) Wait time (Note 3) 30 sec or less 6) Resolution...
  • Page 9 CHAPTER 1 12) Noise (published noise Sound power level 67 dB or less (printing) by ISO9296) 57 dB or less (standby) Sound pressure level 53 dB or less (printing) (bystander position) 38 dB or less (standby) 13) Dimensions 488 (W) x 455 (D) x 311 (H) mm/18.9 (W) x 17.7 (D) x 12.2 (H) in. (w/ o options) 14) Weight 15 kg/33 lb (approx.;...
  • Page 10: Options

    5) Print application IPX/SPX : Bindery Server, NDS PServer, NPritner, RPrinter TCP/IP : LPD, FTP, RAW, IPP AppleTalk : CAP (Canon AppleTalk PrintServer) The above specifications are subject to change for product improvements. 2. Paper feeder 1) Pickup paper size A3, B4, A4, A4R (vertical), B5, A5, 11 x 17, LGL, LTR, Executive (plain paper;...
  • Page 11: Safety

    CHAPTER 1 III. SAFETY A. Safety of the Laser Unit Although invisible, laser light is used inside the laser/scanner unit. Do not disassemble the laser/ scanner unit, as exposure to laser light can damage your eyes. The Printer’s laser/scanner unit is not designed for adjustment in the filed. The following shows the label attached to the cover of the laser/scanner unit.
  • Page 12: Names Of Parts

    CHAPTER 1 IV. NAMES OF PARTS A. External View 1. Printer engine • Front of the printer Figure 1-4-1 1: Delivery tray 5: Paper guide 2: Front cover 6: Cassette 3: Open/close lever 7: Power supply switch 4: Multifeeder tray 8: Control panel •...
  • Page 13 CHAPTER 1 • Behind the front cover Figure 1-4-3 1: Static eliminating brush 3: Toner cartridge guide 2: Transfer charging roller 4: Registration roller 2. Paper feeder Figure 1-4-4 1: Connector 3: Cassette 2: Positioning pin 1 - 7...
  • Page 14: Cross Section

    CHAPTER 1 B. Cross Section 1. Printer engine [6] [7] [19] [18] [17] [16] [15] [14] [13] [12] [11] [10] Figure 1-4-5 1: Registration roller 11: Cartridge 2: Transfer charging roller 12: Primary charging roller 3: Fixing assembly 13: Photosensitive drum 4: Pressure roller 14: Developing cylinder 5: Fixing roller...
  • Page 15: Installation

    CHAPTER 1 V. INSTALLATION A. Points to Note About Installation The Printer is thoroughly adjusted and inspected at the factory before it is packed and shipped. Installation work is important in that the Printer must perform in the field as it did when it passed the factory inspection.
  • Page 16 CHAPTER 1 3. Spatial requirements Allow an appropriate distance from all walls, thus ensuring unobstructed work space. (Figure 1-5- 1) If the Printer is to be installed on a table, be sure that the table is wide enough to accommodate the Printer’s feet (rubber pads) and strong enough to withstand the Printer’s weight.
  • Page 17: C. Unpacking And Installing

    CHAPTER 1 C. Unpacking and Installing When a piece of metal is brought in from a cold to warm place, droplets of water can develop on its surface. This phenomenon is known as condensation, and the use of an LBP suffering from con- densation can cause various printing faults.
  • Page 18 CHAPTER 1 3. Unpacking and installing the hard disk Note: Before handling the hard disk, be sure to touch a metal area of the Printer to avoid dam- aging the PCBs by static charges. 1) Turn off the Printer, and disconnect the power cord and the interface cable. 2) Take out the hard disk from its packaging box.
  • Page 19 CHAPTER 1 6) Holding the metal cover area [5] of the hard disk, slide in the hard disk along the guide rail. Figure 1-5-4 7) Secure the top and bottom of the hard disk with the 2 screws [6] that come with the hard disk. Figure 1-5-5 8) Attach the expansion board slot cover and the power cord.
  • Page 20 CHAPTER 1 4. Unpacking and installing the built-in print server (Ether Board EB-65) Caution: If possible, wear a wrist strap designed to prevent damage by static charges. The static charges in your body can damage the electric mechanisms when you install the built-in print server to the Printer.
  • Page 21 CHAPTER 1 6) Slide in the print sever [5] into the expansion board slot 2 along the groove found inside. Figure 1-5-8 7) Secure the top and bottom of the print server using the two screws [6] that come with the print server.
  • Page 22 CHAPTER 1 11) Turn on the power switch, and check to make sure that the LNK lamp (green) of the print server is ON. • In the case of 10Base-T, check to make sure that the LNK lamp is ON. •...
  • Page 23 CHAPTER 1 6. Points to note when using the printer 1. When turning on the power switches, be sure to start with the external devices and then the Printer. To turn off the power switches, be sure to start with the Printer and then the external devices.
  • Page 24: D. When Storing Or Handling The Ep-65 Cartridge

    CHAPTER 1 D. When Storing or Handling the EP-65 Cartridge The cartridge is subject to the effects of the environment it is in whether it remains packaged or installed in the Printer, and it takes on changes over time regardless of how many pages it has printed.
  • Page 25 CHAPTER 1 b. After taking out of the package (removing the seal) The photosensitive drum is made of photoconducting material (OPC), and tends to deteriorate when exposed to strong light. The toner is also kept inside the cartridge, requiring care after the cartridge has been taken out its the package.
  • Page 26 CHAPTER 1 5. Do not attempt to touch the surface of the photosensitive drum of the cartridge. Further, do not clean the photosensitive drum. Drum Figure 1-5-14 6. Do not place the cartridge upright or turn it over. Be sure it is laid with the label surface facing upward.
  • Page 27: Relocating The Printer

    CHAPTER 1 VI. RELOCATING THE PRINTER If the Printer must be relocated after installation by truck or other means of transportation, take note of the following: 1. Moving the printer with the cartridge removed Once the cartridge is removed, the transfer charging roller can become displaced. Secure the transfer charging roller in place using tape as follows before starting to move the Printer: •...
  • Page 28: Routine Maintenance/inspection By The User

    CHAPTER 1 VII. ROUTINE MAINTENANCE/INSPECTION BY THE USER To ensure that the Printer remains in its best condition, advise the user to provide the following maintenance: 1. Cartridge If the images are fuzzy or show white spots, or the cartridge is running out of toner, shake or replace the cartridge.
  • Page 29 CHAPTER 1 7) Press the Go key so that the Printer starts cleaning the fixing roller. Note: Allow about 5 min before the cleaning sheet is delivered to the delivery tray after cleaning is started. 8) Press Go key to bring the printer on-line state. 4.
  • Page 30 CHAPTER 1 4) Open the manual feed tray; while pushing down the holding plate, fit the manual feed cleaning tool in place as shown. Figure 1-7-5 5) Set the paper guide of the multifeeder manual feed tray to postcard size. Figure 1-7-6 Note: After fitting the manual feed tray cleaning tool in place, check to make sure that it has...
  • Page 31: Using The Printer

    CHAPTER 1 VIII. USING THE PRINTER A. The Operation Panel The operation panel is used to perform basic printer operations, make printer configuration changes that software applications cannot control, identify available typefaces, and check the status of the printer. The operation panel consists of the status indication display,four indicator lights, and six menu and operation keys.
  • Page 32 CHAPTER 1 [6] Value key: With an item name displayed, press Value key to step through the item's values. Press Shift and Value keys to step through the values in reverse order. Some items have a large range of numbers from which to choose a value. [7] Enter/Cancel key Save a value you selected for an item in the menu.
  • Page 33: B. Operation Panel Menus

    CHAPTER 1 B. Operation Panel Menus You can access the following menus though the operation panel: • SHUTDOWN MENU*3 • SECURED JOB MENU*1 • TEST MENU • PCL MENU • PS MENU*2 • FEEDER MENU • CONFIG MENU • JOB CONTRL MENU*3 •...
  • Page 34: C. Service Menu

    CHAPTER 1 3. Restoring the default settings Types of default settings are as follows: Factory default settings are those set for each menu item at the factory. The printer uses these settings changed. Temporary default settings are those set by the application software for the current print job. Permanent default settings are those set through the operation panel.
  • Page 35 CHAPTER 1 Press: To move: Arrow in User Menu Operation Flow MENU Forward Menu level SHIFT & Back ITEM Forward Item level SHIFT & Back Press “Go” to take the printer off-line. Value level VALUE Forward READY SHIFT & VALUE Back Enter level ENTER...
  • Page 36 CHAPTER 1 1 - 30...
  • Page 37 CHAPTER 1 NOTE: FORMAT MENU Service Menu Operation Flow * FORMAT DISK - This is not displayed, when HDD is not installed. After pressing two or more panel keys on boot-on, * FORMAT FLASH the panel key of further the plurality is pressed - This is not displayed, once again.
  • Page 38 CHAPTER 1 1 - 32...
  • Page 39: Outline Of Operation

    CHAPTER 2 OUTLINE OF OPERATION 1. The roles played by specific functions, the relationship between electrical system and me- chanical system, and the timing at which each mechanism is driven are discussed according to functions. In any diagram, the symbol indicates a mechanical path.
  • Page 40: Basic Operation

    CHAPTER 2 I. BASIC OPERATION A. Functional Construction The Printer may be broadly divided into five functional blocks: engine control system, laser expo- sure system, image formation system, pickup/feeding system, and system control system. Control panel System control block To external device (e.g., host computer) Video controller PCB Engine control system Face-down...
  • Page 41: Sequence Of Basic Operation

    CHAPTER 2 B. Sequence of Basic Operation The sequence of the printer operation is controlled by the microprocessor found on the DC control- ler PCB. The conditions and the purposes of the sequence of each interval at power-on and during printing are as follows: •...
  • Page 42 CHAPTER 2 • Basic Sequence of Operation at Power-On Power switch ON Fixing roller 140˚C (unit: sec) WAIT STBY WMUP WMUPR Main motor (M101) Registration clutch (CL102) 1.0 (approx.) 0.56 (approx.) Primary high voltage(AC) Primary high voltage(DC) 0.46 (approx.) Developing bias(AC) Developing bias(DC) Transfer high voltage Fixing heater(H101)
  • Page 43: During Printing

    CHAPTER 2 • During Printing Table 2-1-2 Interval Purpose Remarks From when the warm-up rotation To control the fixing roller to interval ends to when the /PRNT standby state, thereby keeping signal arrives from the video the Printer ready for printing. STBY controller.
  • Page 44 CHAPTER 2 • Basic Sequence of Operation During Printing (from printer cassette, A4) /PRNT input (unit: sec) INTR PRINT LSTR STBY STBY /PRNT Main motor (M101) Scanner motor 0.15 (M102) 4.5 (approx.) /SCNRDY Pickup clutch 0.46 (CL101) Registration paper sensor (PI101) Registration clutch 0.06 (may be adjusted) (CL102)
  • Page 45: Power-on Sequence

    CHAPTER 2 C. Power-On Sequence The following shows the flow of operation from when the power switch is turned on to when the Printer enters warm-up state. Power ON CPU initialized Option feeder connection checked /PPRDY signal generated Communication with video interface started The printer inside is checked for residual paper.
  • Page 46: Engine Control System

    CHAPTER 2 II. ENGINE CONTROL SYSTEM A. Outline of the Electrical Circuitry 1. Outline The sequence of operation of the Printer is controlled by the CPU found on the DC controller PCB. When the power switch is turned on and the Printer enters standby state, the CPU generates signals to drive such loads as laser diodes, motors, and solenoids in response to the print start command and image data from an external device.
  • Page 47 CHAPTER 2 2. Operation within the block a. CPU The CPU is an 8-bit microprocessor. It is a single-chip type, possessing a built-in ROM and RAM; it performs the following operation of the Printer using ASIC according to the control program stored in ROM.
  • Page 48: Inputs To And Outputs From The Dc Controller

    CHAPTER 2 B. Inputs to and Outputs from the DC Controller 1. Inputs to the DC controller DC controller PCB J909 J106 J916 Registration When paper is present, ‘L’. /RGSNS paper sensor PI101 J910 J108 Multifeeder /MPSNSI When paper is present, ‘L’. paper sensor PI102 J914...
  • Page 49 CHAPTER 2 2. Outputs from the DC controller DC controller PCB +24V J904 J106 Multifeeder pickup SL101 -15 MPFDO When ‘H’, SL101 goes ON. solenoid +24V J906 J106 Cassette CL101 -19 /CSTFD pickup clutch When ‘L’, CL101 goes ON. J905 J106 +24V Registration...
  • Page 50 CHAPTER 2 3. Inputs to and outputs from the DC controller DC controller PCB AC power input J1201 J105 RLYDRV When ‘H’, the relay goes ON to cut power to the fixing heater. SW102 Main power switch /FSRDRV When ‘H’, the fixing heater (H101) goes ON.
  • Page 51: Controlling The Fixing Mechanisms

    CHAPTER 2 C. Controlling the Fixing Mechanisms 1. Outline Delivery roller Separation claws Static Static eliminating brush Pressure eliminating brush roller /FSRDRV /ZEROXI M101 TH1/TH2 Thermal switch Fixing roller Fixing heater Main thermistor (middle) Sub thermistor (right) Figure 2-2-5 The fixing roller, pressure roller, and delivery roller of the fixing assembly are driven by the main motor (M101).
  • Page 52 CHAPTER 2 2. Controlling the fixing temperature The fixing temperature is controlled in relation to the following: a. paper type b. power switch activation c. sleep mode (power saving mode) d. down sequence a. Control by paper type To ensure good fixing on rough paper and transparencies, the Printer's utility mode includes rough paper mode and transparency mode;...
  • Page 53 CHAPTER 2 (2) Controlling to the target temperature To ensure good fixing as soon as the power switch is turned on, a target temperature is set in relation to the fixing temperature at power-on and the state of the Printer after power-on. •...
  • Page 54: Circuit

    CHAPTER 2 3. Fixing heater safety circuit To prevent malfunction of the fixing heater, the Printer monitors the readings of the main thermis- tor and the sub thermistor at all times in relation to the ASIC and the high-temperature detection circuit found on the DC controller PCB.
  • Page 55 CHAPTER 2 4. Protective functions The printer is equipped with the following protective functions to prevent malfunction of the fixing heater: a. Thermistor (detecting overheating) The ASIC and the high-temperature detection circuit found on the DC controller PCB monitors the voltage readings of the main thermistor and the sub thermistor;...
  • Page 56 CHAPTER 2 5. Detecting a fault in the fixing assembly The CPU will identify a fault in the fixing assembly under any of the following conditions (a through e) and execute the following: 1) Causes the /FSRDRV signal to go High to cut the power to the fixing heater. 2) Causes the RLYDRV signal to go Low to turn off RL1 while at the same time communicating the presence of a fault to the video controller PCB, thereby indicating any of the following on the LCD in the control panel: ‘E000’, ‘E001’, ‘E003’, ‘E808’.
  • Page 57: D. High-voltage Power Supply Circuit

    CHAPTER 2 D. High-Voltage Power Supply Circuit 1. Outline Video DC controller PCB controller PCB High-voltage power supply PCB ASIC J104 Primary TB401/TB402 /PRNT bias circuit T403 Transfer bias circuit TB403/TB404 Developing bias circuit Toner level TB405/TB406 detection circuit Figure 2-2-7 The high-voltage power supply circuit is mounted on the DC controller PCB, and is used to apply a voltage (generated by combining DC and AC voltages) to the primary charging roller and the developing cylinder in response to commands from the CPU and according to the print signal (/...
  • Page 58 CHAPTER 2 • At power-on Main switch 140˚C (unit: sec) WAIT STBY WMUP WMUPR Print start command(/PRNT) Main motor(M101) Scanner ready signal(/SCNRDY) 1.0 (approx.) 0.56 (approx.) Primary AC bias Primary DC bias 0.46 (approx.) Developing AC bias Developing DC bias Negative bias Transfer bias Figure 2-2-8...
  • Page 59 CHAPTER 2 2. Operation a. Primary charging DC controller PCB Primary bias circuit Primary DC bias /DCPWM Comparison voltage detection ASIC circuit circuit /PRDCFOT generation circuit TB401/TB402 Combination To primary /PRACFOT charging roller generation circuit Primary AC bias /PRACON Comparison current detection circuit circuit...
  • Page 60 CHAPTER 2 b. Development DC controller PCB To primary bias circuit Developing bias circuit Developing DC /DCPWM Comparison bias voltage circuit ASIC detection circuit /DVDCUP DC generation circuit /DVDCFOT TB403/TB404 Superimposition To developing /DVACFOT cylinder /DVACON AC generating circuit Developing bias detection circuit TNRCHKD TB405/TB406...
  • Page 61 CHAPTER 2 c. Detecting the toner level and the presence/absence of a cartridge A toner level sensor is mounted inside the cartridge. The Printer collects readings (Ant) of the toner level sensor mounted inside the cartridge and the output (Dv) of the developing bias, and subjects them to A/D conversion. The CPU checks the difference between the cartridge detection signal (TNRCHKD) and the toner detection signal (TNRCHKT) occurring after A/D conversion when the developing bias is applied to find out the level of toner and the presence/absence of a cartridge.
  • Page 62: Low-voltage Power Supply Circuit

    CHAPTER 2 E. Low-Voltage Power Supply Circuit 1. Outline Power supply PCB DC controller PCB Control panel High-voltage power supply circuit Video controller +3.3V +24VR Laser unit Low-voltage power supply circuit BD detection +3.3V J1201 -8~-15 +3.3V circuit J1201 Paper size +3.3V -18~-19 +5V circuit...
  • Page 63 CHAPTER 2 The AC power arriving at the low-voltage power supply circuit on the power supply PCB is con- verted into three power levels (+24 V, +5 V, +3.3 V), and is sent to the DC controller PCB. The +24 V may be either of the following two: +24 V which is stopped when the right door switch (SW3) or the left door switch (SW4) is turned off (i.e., the front cover is opened), and +24 V which is supplied regardless of the state of these switches.
  • Page 64: Video Interface Control

    CHAPTER 2 F. Video Interface Control 1. Outline The following explains the types of interface signals used between the DC controller circuit and the video controller circuit, and provides an outline of operation sequence executed using these interface signals. a. System block diagram External device (e.g., host computer) Video controller PCB Video interface...
  • Page 65 CHAPTER 2 b. Video interface signals DC controller Video controller J104- /PPRDY /CCRT /SBSY /PCLK /STS /RDY /TOP /CBSY /CCLK /CMD /PRNT /PRFD /CPRDY /BDO /VDO Figure 2-2-15 When the power switch is turned on, the Printer enters wait state (WAIT). When WAIT ends and warm-up rotation ends, the DC controller sends the ready signal (/RDY) to the video controller, indicaing that the Printer is ready for printing.
  • Page 66: Other Control

    CHAPTER 2 G. Other Control 1. Controlling the main motor The following shows the circuit used to control the main motor: DC controller PCB Main motor +24VR J106-8 J106-9 J106-12 MTRON +3.3V M101 J106-13 /MLOCK J106-10 J106-11 Figure 2-2-16 The main motor is a 3-phase DC brushless motor with a built-in Hall element, and is mounted to the motor drive PCB.
  • Page 67 CHAPTER 2 2. Controlling the fan motor The Printer is equipped with a single fan used to discharge heat from inside the machine. The heat discharging fan (FM101) is controlled by the following circuit and at such times as indicated: DC controller PCB +24V +24V...
  • Page 68 CHAPTER 2 When the power switch is turned on or when sleep state is ended, the fan ON signal (FANON) goes High and the fan full-speed rotation signal (FANFULL) goes High; the Printer supplies the fan drive voltage (FANDRV; about 24 V) to rotate the heat discharging fan at full speed. The Printer also rotates the heat discharging fan at full speed for 30 sec after the end of last rotation (LSTR) and between sheets.
  • Page 69: Laser/scanner System

    CHAPTER 2 III. LASER/SCANNER SYSTEM A. Outline External device Video controller PCB /BDO /VDO /TOP DC controller PCB /BDIN /VDO /ENBLO /LONO DPICH /ACCO /DECO Cylindrical lens Laser unit 6-faceted mirror Scanner motor BD PCB No. 1 reflecting mirror Imaging lens BD mirror Photosensitive drum No.
  • Page 70: Laser Control Circuit

    CHAPTER 2 B. Laser Control Circuit 1. Outline DC controller PCB Laser unit (laser (photodiode) diode) J104-20 /PRNT Laser driver IC J102 J907 ASIC /BDO J104-30 /LONO Logic /ENBLO circuit Drive circuit /BDIN /DPICH Power adjust Control /VDOUT /VDO ment amplification circuit circuit...
  • Page 71 CHAPTER 2 2. Controlling the automatic emission of the laser diode The automatic emission mechanism (APC) of the laser diode is controlled by the laser driver IC, ensuring that the laser diode emits light of a specific intensity. When the laser forced emission signal (/LONO) goes ‘L’ or the image formation enable signal (/ ENBLO) and the /VOUT signal go ‘L’, the laser diode is turned on in keeping with the reference voltage of the laser driver PCB.
  • Page 72 CHAPTER 2 4. Controlling the emission of the laser diode In keeping with the paper size information from the CPU, the ASIC generates the image formation enable signal (/ENABLO), and sends it to the logic circuit of the laser driver IC. The /VDOUT signal is masked by the /ENABLO signal in the logic circuit so that the length of time during which the laser diode emits light is controlled.
  • Page 73: Scanner System

    CHAPTER 2 C. Scanner System 1. Controlling the scanner motor The following is a diagram of the scanner motor control circuit: DC controller PCB /BDIN J102-10 BD PCB J1001-2 J106-20 /PRNT +24V +24V J106-4 J911-4 Scanner ASIC driver IC /ACCO Drive circuit /DECO...
  • Page 74 CHAPTER 2 The CPU monitors the /BDIN signal coming from the BD PCB to find out whether the scanner motor is rotating at a specific speed of rotation. The CPU will identify any of the following conditions to be a scanner unit fault, and will communi- cate the fact to the video controller and indicate ‘E110’...
  • Page 75 CHAPTER 2 2. Scanner pre-rotation To ensure that the rotation of the scanner motor stabilizes fast at time of start-up, the machine rotates the scanner motor by sending the scanner pre-rotation command about 4.25 sec (varies depending on the image data reception time) in advance of the pickup command (/PRINT) sent by the video controller to the ASIC, ultimately ensuring the correct positioning of the image leading edge.
  • Page 76: Image Formation System

    CHAPTER 2 IV. IMAGE FORMATION SYSTEM A. Outline The image formation system is the core of the Printer, and consists mainly of a cartridge and a fixing assembly. When the video controller PCB sends the print signal (/PRNT) to the DC controller PCB, the DC controller PCB drives the main motor (M101) to start rotating the photosensitive drum, developing cylinder, primary charging roller, and transfer charging roller.
  • Page 77 CHAPTER 2 B. Printing Process As shown in the diagram, the principal area of the image formation system is found inside the cartridge: Cleaning blade Primary charging roller Photosensitive drum Laser beam Blade Cartridge Developing cylinder Figure 2-4-2 The Printer uses a 2-layer seamless drum; the outer coating is a photo conducting laser made of optical photoconduction (OPC) material, while the inner coating is an aluminum substrate.
  • Page 78 CHAPTER 2 The printing process broadly consists of the following 5 blocks (7 steps): (1) Latent static Image Formation Block Step 1: primary charging (-) Step 2: laser beam exposure (2) Development Block Step 3: development (3) Transfer Block Step 4: transfer (+) Step 5: separation (grounding) (4) Fixing Block Step 6: fixing...
  • Page 79 CHAPTER 2 1. Latent static image formation block This block consists of 2 steps, and is used to form a latent static image on the photosensitive drum. At the end of the last step of this block, the area of the surface of the photosensitive drum not exposed by the laser beam (dark area) will retain negative charges, while the area on the surface of the photosensitive drum exposed by the laser beam (light area) will be free of negative charges.
  • Page 80 CHAPTER 2 Step 2: laser beam exposure Laser beam Dark area Light area Figure 2-4-7 When the laser beam is run across the photosensitive drum, the charges in the light area become neutralized, forming a latent static image. 2. Developing block In this block, toner is deposited to cover the latent static image on the surface of the photosensi- tive drum, thus turning it into a visible image.
  • Page 81 CHAPTER 2 As can be learned from the diagram, the developing assembly consists of a fixed magnet, a devel- oping cylinder that rotates around the magnet, and a rubber blade. The developer is called toner, and the Printer uses a 1-component type; it is composed of mag- netite and resins, and is retained on the cylinder by a magnetic force.
  • Page 82 CHAPTER 2 3. Transfer block This block is used to transfer the toner image on the surface of the photosensitive drum to paper. Step 4: transfer Transfer charging roller Photosensitive drum Paper Figure 2-4-10 Positive charges are applied to the back of paper to draw toner to the face of the paper from the photosensitive drum.
  • Page 83 CHAPTER 2 4. Fixing block The toner on the paper from the transfer block is retained on the paper by the work of static charges, and can move astray in response to the lightest impact (as when touched by the hand). The toner and the paper are thus subjected to pressure and heat, thereby fusing the toner with the fibers of the paper and, ultimately, making the image permanent.
  • Page 84 CHAPTER 2 5. Drum cleaning block In the transfer step, not all toner on the photosensitive drum is transferred to the paper, with some being left behind. The drum cleaning block is used t clean the surface of the photosensitive drum, thereby ensur- ing the reproduction of sharp images for the next run.
  • Page 85: Outline

    CHAPTER 2 V. PICKUP/FEEDING SYSTEM A. Outline The presence/absence of paper in the multifeeder tray is detected by the multifeeder tray paper sensor (PI102), and the presence/absence of paper in the cassette is detected by the cassette paper sensor (PI104). The size of paper inside the cassette set in the Printer and the presence/absence of the cassette are checked by the paper size detecting switch (SW105) inside the Printer.
  • Page 86 CHAPTER 2 The following diagram shows the arrangement of the rollers and the sensors used in the pickup/ feeding system: DC controller PCB Delivery roller PI103 Fixing roller Transfer Photosensitive charging drum roller manual feed pickup Registration roller roller PI101 Cassette pickup roller PI102 PI104...
  • Page 87 CHAPTER 2 The following diagram gives an outline of operation: DC controller PCB M101 SL101 CL102 CL101 Figure 2-5-2 SL101: multifeeder pickup solenoid CL101: multifeeder pickup clutch CL102: registration clutch M101: main motor 2 - 48...
  • Page 88: Detecting The Paper Size

    CHAPTER 2 B. Detecting the Paper Size 1. Detecting the size of paper in the cassette When the cassette is set in the Printer, specific switches are turned on: combinations of the states of the following switches are used by the CPU to detect the size of paper inside the cassette or the presence/absence of the cassette: Table 2-5-1 Paper size...
  • Page 89: Using The Cassette

    CHAPTER 2 C. Using the Cassette 1. Outline When the video controller sends the /PRNT signal to the Printer, the CPU rotates the main motor (M101); in about 0.15 sec, it turns on the pickup clutch (CL101) to transmit the rotation of the main motor to rotate the cassette pickup roller.
  • Page 90: Using The Multifeeder

    CHAPTER 2 D. Using the Multifeeder 1. Outline The presence/absence of paper in the multifeeder tray is detected by the multifeeder paper sensor (PI102). When the /PRNT signal arrives from the video controller, the CPU rotates the main motor (M101) and the scanner motor (M102), and then turns on the multifeeder solenoid (SL101) as soon as the Printer is ready for printing.
  • Page 91: Manual Feed

    CHAPTER 2 • Multifeeder Tray Pickup Operation Manual feed pickup roller Manual feed separation pad Multifeeder M101 Multifeeder pickup solenoid pickup clutch Figure 2-5-6 • Basic Sequence of Operation for Multifeeder Tray Pickup /PRNT signal IN (unit: sec) STBY INTR PRINT Main motor (M101)
  • Page 92: Fixing/delivery Assembly

    CHAPTER 2 E. Fixing/Delivery Assembly The pressure roller and the delivery roller of the fixing assembly are driven by the main motor (M101). The paper separated from the photosensitive drum is moved to the inside of the fixing assem- bly, and the toner is fused to its fibers by the work of the fixing roller; the paper is then moved outside the fixing assembly.
  • Page 93: Detecting Jams

    CHAPTER 2 F. Detecting Jams 1. Outline The following paper sensor are used to monitor the movement of paper inside the Printer: • Registration paper sensor (PI101) • Delivery sensor (PI103) The presence of a jam is checked at such times as instructed by the program stored in advance in the CPU in relation to the presence/absence of paper at a specific sensor.
  • Page 94 CHAPTER 2 • Sequence for a Pickup Delay Jam (cassette) /PRNT signal Jam message ON 2nd sheet picked up Pickup control Standby Main motor (M101) Pickup clutch (CL101) Registration paper sensor jam check Registration paper Normal Error sensor (PI101) Figure 2-5-11 •...
  • Page 95 CHAPTER 2 b. Stationary jam A jam will be detected if the registration paper sensor (PI101) detects the absence of paper (trailing edge of the previous sheet) by the time the leading edge of paper reaches the registration paper sensor. In the case of the last sheet when printing a single page or in continuous mode, if the registra- tion paper sensor (PI101) does not detect the trailing edge of paper within a specific period of time after the registration clutch (CL102) is turned on, the CPU will identify the condition as a jam;...
  • Page 96 CHAPTER 2 3. Delivery jams a. Delivery assembly delay jam A delivery leading edge delay jam or the fixing assembly wrap jam will be identified by the DC controller as a delivery assembly delay jam. When the CPU on the DC controller detects the presence of a jam, it will stop printing operation and indicates the fact to the video controller.
  • Page 97 CHAPTER 2 b. Delivery assembly stationary jam A delivery trailing edge delivery jam or a delivery stationary jam is identified by the DC controller as a delivery assembly stationary jam. When the CPU on the DC controller PCB detects a jam, it will stop printing operation and indicates the fact to the video controller.
  • Page 98: Video Control System

    CHAPTER 2 VI. VIDEO CONTROL SYSTEM A. Outline of the Electrical Curcuitry 1. Outline This circuit is designed to receive print data consisting of code data or image data from an external device (e.g., host computer) through an interface cable. The circuit processes the print data it has received based on the instructions from the control panel for conversion into dot data.
  • Page 99 CHAPTER 2 EEPROM (IC4, IC5) It possesses 32K bits of memory, and it allows erasing and writing of data. It is used to retain data (various settings; printing environment, number of pages) after power is turned off. g. Program ROM version up When installing a ROM DIMM for version up to the slot (J1/J2/J3), the functions of the mounted built-in program ROM will be stopped and its contents will be replaced by the contents held in the newly installed ROM DIMM.
  • Page 100 CHAPTER 2 The following is a block diagram of the video controller circuit: <J8> <J9> <J10> <J6> <J5> Expansion External Control interface interface device panel controller (option) (option) Video Centronics Expansion HDD/expansion EEPROM controller interface interface interface interface ASIC X'TAL1 X'TAL2 X'TAL3 66MHz...
  • Page 101: Operation Panel

    CHAPTER 2 B. Operation Panel 1. Outline The operation panel has one LCD with 16 characters by 2 lines, six switches, and four LEDs. The operation panel is connected with the video controller PCB and has the following functions. a. Displays status and error message on the LCD. b.
  • Page 102: Self Test

    CHAPTER 2 C. Self Test The printer has the function to check the condition of the video controller by executing the self diagnosis program of the video controller. This is called ‘self-test’ Self-test has two kinds of test; power ON self test and power ON key sequence. 1.
  • Page 103 CHAPTER 2 7) If the Value key is pressed, all the LEDs are lit and the right half of the LCD (8 columns/both rows) is illuminated. Releasing the key clears the LEDs and the display. 8) If the Enter key is pressed, all the LEDs are lit and all the columns of the LCD are illumi-nated (i.e.
  • Page 104: Paper Feeder

    CHAPTER 2 VII. PAPER FEEDER A. Outline A paper feeder is used to pick up paper from any of the cassettes set inside, forwarding it to its host printer. As many as three paper feeders may be connected to the Printer: the first paper feeder will be referred to as PF1, while the second and third paper feeders are respectively referred to as PF2 and PF3.
  • Page 105: Inputs To And Outputs From The Paper Feeder Controller

    CHAPTER 2 B. Inputs to and Outputs from the Paper Feeder Controller Paper feeder controller PCB J155 Feed When paper is present, ‘H’. FSEN paper sensor PI201 J154 Cassette /CSPSEN when paper is present, ‘L’. paper sensor PI202 J153 PSSN4 PSSN3 Paper size See V-C ‘Detecting Paper...
  • Page 106: Pickup/feeding Operation

    CHAPTER 2 C. Pickup/Feeding Operation 1. Outline The paper feeder pickup motor is a stepping motor, and its speed is controlled by the paper feeder controller PCB. The paper feeder controller executes pickup operation or feeding operation in response to the pickup command or the feed command from the DC controller of the Printer.
  • Page 107 CHAPTER 2 The following is an outline diagram of the drive mechanism: DC controller PCB Feeding roller PI201 Cassette pickup roller M201 CL201 PI202 SW201 Cassette separation pad Figure 2-7-3 PI201: paper feeder feed paper sensor PI202: paper feeder cassette paper sensor CL201: paper feeder pickup clutch M201: paper feeder pickup motor SW201:paper size detecting switch...
  • Page 108 CHAPTER 2 Basic Sequence of Operation • 3 paper feeders, pickup from bottommost; A4 /PRNT signal IN (unit: sec) INTR STBY PRINT 0.59 (approx.) PF3 pickup clutch PF3 pickup motor 0.61 (approx.) PF3 cassette paper sensor 0.54 (approx.) PF2 pickup motor 0.92 (approx.) PF2 cassette paper sensor...
  • Page 109: Detecting Jams

    CHAPTER 2 D. Detecting Jams The feed paper sensor (PI201) is used to check the presence/absence of paper and to find out if paper is moving correctly. It checks for a jam in terms of the presence/absence of paper over it at such times as programmed in advance.
  • Page 110: Chapter 3 Mechanical System

    CHAPTER 3 MECHANICAL SYSTEM To disassemble/assemble the Printer, following the instructions given in this chapter. The service person is expected to identify the cause of a fault by referring to the descriptions in Chapter 4 ‘Troubleshooting,’ and then to replace appropriate parts according to the instructions given while heeding the following: 1.
  • Page 111: Externals And Controls

    CHAPTER 3 I. EXTERNALS AND CONTROLS A. External Covers [10] [1] Control panel [2] Cassette [3] Multifeeder tray [4] Front cover [5] Upper cover [6] Right cover [11] [12] [7] Left cover Figure 3-1-1 [8] Expansion board slot cover (1) [9] Rear cover [10] Slot cover (2) [11] Expansion board slot 1 (1)
  • Page 112 CHAPTER 3 1. Removing the upper cover and the con- 2. Mounting the upper cover and the con- trol panel trol panel 1) Remove the expansion board slot cover. 1) Mount the upper cover [2] with 2 screws 2) Remove the 2 screws [1], and slide out [1].
  • Page 113 CHAPTER 3 2) Connect the connector [5] to the control 3) Lift the front cover [3] slightly to detach. panel, and mount the control panel [6] to the upper cover [7]. Figure 3-1-10 Figure 3-1-8 4. Remove the left cover Caution: If a hard disk (option) is installed, 3) Mount the extension slot cover.
  • Page 114: Heat Discharging Fan

    CHAPTER 3 5. Removing the right cover B. Heat Discharging Fan 1) Remove the upper cover. 1. Removing the heat discharging fan 2) Slide out the front cover slightly. 1) Remove the video controller PCB. (See II- 3) Remove the screw [1], and detach the B-1 ‘Removing the Video Controller PCB right cover [2].
  • Page 115: Door Switch Assembly

    CHAPTER 3 C. Door Switch Assembly Caution: When mounting the heat dis- 1. Remove the left door switch charging fan, be sure to pay at- 1) Remove the video controller PCB. (See II- tention to the direction of air cur- B-1 ‘Removing the Video Controller PCB rent.
  • Page 116 CHAPTER 3 2. Removing the right door switch 5) Remove the 3 screws [5], and open the 1) Remove the video controller PCB. (See VII- right rail [6] slightly. B-1 ‘Removing the Video Controller PCB unit.’) 2) Remove the drive assembly. (See III-B-1 ‘Removing the Drive Assembly.’) 3) Remove the screw [1], and remove the grounding plate [2].
  • Page 117 CHAPTER 3 8) Disconnect the relay connector [10], and free the harness from the harness guide. [10] Figure 3-1-23 9) Remove the claw [11], and detach the right door switch [12]. Figure 3-1-24 3 - 7...
  • Page 118: Pcbs

    CHAPTER 3 B. Video Controller PCB II. PCBS 1. Removing the video controller PCB unit A. Arrangement of the PCBs If a standard network or option network board is connected, be sure to remove it be- fore starting the following steps: 1) Remove the rear cover.
  • Page 119 CHAPTER 3 2. Removing the video controller PCB 3. Remove the RAM DIMM/ROM DIMM 1) Remove the rear cover. (See I-A-6 ‘Remov- (option) ing the Rear Cover.’) The RAM/ROM is found as follows: 2) Remove the connector cover [1]. 3) Disconnect the connector [2] and the flex- Option ROM / P-ROM slot ible cable [3] from the back of the PCB.
  • Page 120 CHAPTER 3 4. Mounting the RAM DIMM (option) 2) Check to make sure that the lever [3] is at the same position as the slot [4]. Caution: The RAM DIMM must be one spe- cifically designed for the Printer. The location of the cut-off differs between regular RAM DIMMs and one designed for the Printer.
  • Page 121 CHAPTER 3 1) Push down the ROM slot lever [1]. 6. Removing the hard disk (option) 1) Remove the extension board slot cover and the slot cover. 2) Remove the 2 screws [1], and detach the hard disk [2]. Figure 3-2-12 2) Holding it so that the cut-off [2] is as shown, insert the ROM DIMM [3] along the guide groove.
  • Page 122: Video Controller Pcb

    CHAPTER 3 C. DC Controller PCB 1) Remove the multifeeder tray. (See IV-B- 1. Removing the DC controller PCB 1 ‘Removing the Multifeeder Tray.’) The following is an outline of the work flow 2) Remove the video controller PCB unit. used to disassemble/assemble PCBs: (See II-B-1 ‘Removing the Video Control- ler PCB unit.’)
  • Page 123 CHAPTER 3 5) Remove the power switch rod [5]. 7) Remove the 7 screws [8]. Refer to the $ making to the side of the screw holes to identify the screws to remove. One of the screws [9] need not be removed. Figure 3-2-20 6) Remove the 6 screws [6].
  • Page 124: Power Supply Pcb Assembly

    CHAPTER 3 9) Remove the flexible cable [12], 5 screws D. Power Supply PCB Assembly [13], and lock support [14]; then, detach 1. Removing the power supply PCB the DC controller PCB [15]. See II-C-1 ‘Removing the DC Controller PCB’ for an outline of the flow of work used to dis- assemble/assemble the PCBs.
  • Page 125: Drive Mechanisms

    CHAPTER 3 5) Disconnect the connector [4] and remove III. DRIVE MECHANISMS the three 3 screws [5]; then, detach the main motor [6]. A. Main Motor 1. Removing the main motor 1) Remove the front cover and the left cover. (See I-A-3 ‘removing the Front Cover’...
  • Page 126: Drive Assembly

    CHAPTER 3 B. Drive Assembly 5) Remove the 4 screws [5], and detach the 1. Removing the drive assembly drive assembly [6]. 1) Remove the main motor. (See III-A-1 ‘Re- moving the Main Motor.’) 2) Remove the manual feed pickup roller. (See IV-B-2 ‘Removing the Manual Feed Pickup Roller.’) 3) Disconnect the 4 connectors [1], and free...
  • Page 127: Feeding Mechanisms

    CHAPTER 3 2. Replacing the cassette separation pad IV. FEEDING MECHANISMS Caution: Be sure to replace the cassette A. Cassette Pickup Assembly pickup roller at the same time. 1. Replacing the cassette pickup roller 1) Slide out the cassette, and remove all Caution: Be sure to replace the cassette paper.
  • Page 128 CHAPTER 3 5) Mount the new cassette separation pad 3) Disconnect the 3 connectors [3], and free [3] and the spring [4] at the same time. the harness form the harness guide. 4) Remove the 2 screws [4]. Figure 3-4-5 Figure 3-4-7 3.
  • Page 129 CHAPTER 3 6) Remove the 2 upper claws (longer) [8] and 4) Remove the cassette pickup clutch [3]. the 2 lower claws (shorter) [9]; then, de- tach the grounding plate [10]. Detach the paper size detecting switch [11]. [11] [10] Figure 3-4-11 Figure 3-4-9 4.
  • Page 130: B. Multifeeder Tray Pickup Assembly

    CHAPTER 3 B. Multifeeder Tray Pickup Assembly Caution: After mounting, check to make 1. Removing the multifeeder tray sure that the holding plate [4] is 1) Slide out the cassette, and detach the pushed down by the manual feed front cover. (See I-A-3 ‘Removing the pickup roller cam [3].
  • Page 131 CHAPTER 3 3. Mounting the Manual Feed Pickup Caution: When mounting the pickup guide Roller assembly, be sure to refer to the 1) Fit the left side of the manual feed pickup following diagram. Take care not roller [1] into the machine; then, fit the to damage or leave out the sensor right side of the shaft to mount the gear [3].
  • Page 132 CHAPTER 3 4. Removing the manual feed separation 5. Removing the multifeeder paper sen- 1) Remove the manual feed pickup roller. 1) Remove the right cover. (See I-A-5 ‘Re- (See IV-B-1 ‘Removing the Multifeeder moving the Right Cover.’) Tray.’) 3) Disconnect the connector [1]. 2) Remove the manual feed separation pad 4) Remove the claws [2], and detach the [1].
  • Page 133: C. Registration Roller Assembly

    CHAPTER 3 3) Remove the screw [2], and detach the C. Registration Roller Assembly multifeeder pickup solenoid [3]. 1. Removing the registration roller 1) Remove the drive assembly. (See III-B-1 ‘Removing the Drive Assembly.’) 2) Remove the screw [1], and detach the grounding plate [2].
  • Page 134 CHAPTER 3 5) Remove the stepped screw [6], and de- tach the bushing [7]. 6) Remove the registration roller [8]. Figure 3-4-26 2. Removing the registration paper sen- 1) Remove the printer top unit. (See II-D-1 ‘Removing the DC Controller PCB’.) 2) Remove the drive assembly.
  • Page 135: V. Exposure Mechanisms

    CHAPTER 3 4) Remove the dust-proofing sponge [5]. V. EXPOSURE MECHANISMS A. Laser/Scanner Assembly 1. Construction The following show the construction of the laser/scanner assembly. Figure 3-5-3 [1] Scanner assembly [2] Laser assembly 5) Disconnect the 3 connectors [6]. Figure 3-5-1 2.
  • Page 136: Vi. Charging/developing Cleaning Mechanisms

    CHAPTER 3 B. Transfer Charging Roller VI. CHARGING/DEVELOPING/ 1. Removing the transfer charging roller CLEANING MECHANISMS 1) Remove the front cover. (See I-A-3 ‘Re- moving the Front Cover.’) A. EP-65 Cartridge 2) Holding the shaft assembly [1], detach 1. Construction the transfer charging roller [2].
  • Page 137: A. Fixing Assembly

    CHAPTER 3 2. Cleaning the inside of the fixing assem- VII. FIXING SYSTEM bly or replacing its parts A. Fixing Assembly Note: Do not disassemble or clean the fol- 1. Construction lowing parts found inside the fixing The fixing assembly has the following con- assembly in the field;...
  • Page 138 CHAPTER 3 3. Removing the fixing assembly 5) Disconnect the 2 connectors [4], and free 1) Remove the upper cover. (See I-A-1 of this the harness from the harness guide. chapter.) 2) Open the fixing upper cover. 3) Remove the claw [1], and remove the gear [2].
  • Page 139 CHAPTER 3 7) Remove the 2 screws [6], and detach the 4. Removing the pressure roller fixing assembly [7]. 1) Remove the fixing assembly. (See VII-A- 3 of this chapter.) 2) Push down the pressure releasing lever [1] to remove the pressure. Figure 3-7-7 3) Remove the 2 screws [2], and detach the 2 linking plates [3].
  • Page 140 CHAPTER 3 4) Remove the 2 screws [5], open the pres- 5) Remove the 2 screws [9] of the pressure sure roller assembly [6] to about 90, re- roller assembly, and remove the inlet move the D-cut shaft on the right, and guide [10].
  • Page 141 CHAPTER 3 5. Removing the fixing roller and the fix- 6. Mounting the fixing roller and the fix- ing heater ing heater 1) Remove the pressure roller assembly. 1) Open the separation claws [1]. Obtain a (See VII-A-4 of this chapter.) sheet of A3/11 x 17 white paper, fold it 2) Remove the 2 screws [1] of the fixing roller in 4, and fit it as shown.
  • Page 142 CHAPTER 3 4) Prepare a length of paper (plain paper) Note: 1. Be sure to mount the fixing heater cut to a width of about 20 mm. so that its edge with print faces 5) Put the length of paper between the ther- upward.
  • Page 143 CHAPTER 3 6) After mounting the fixing roller and the 8) After making the check, mount the fix- fixing heater, push the fixing aluminum ing assembly to the machine using the core [8] with your finger lightly so as to steps used to remove it but in reverse.
  • Page 144: A. External Covers

    CHAPTER 3 B. Pickup Assembly VIII. PAPER FEEDER 1. Replacing the cassette pickup roller See IV-A-1 ‘Replacing the Cassette Pickup A. External Covers Roller.’ 2. Replacing the cassette separation pad See IV-A-2 ‘Replacing the Cassette Separa- tion Pad.’ 3. Cassette paper sensor 1) Remove the top plate.
  • Page 145 CHAPTER 3 5. Removing the paper size detecting 4) Remove the 2 paper claws (longer) [5] and switch the 2 lower claws (shorter) [6]; then, de- 1) Remove the paper feeder pickup assem- tach the grounding plate [7]. Remove the bly.
  • Page 146 CHAPTER 3 1) Remove the paper feeder pickup assem- 3) Remove the 2 springs [3]. bly. (See VIII-C-1 ‘Removing the Paper Feeder Pickup Clutch.’) 2) Remove the screw [1], and detach the grounding plate [2]. Figure 3-8-10 Caution: When mounting, hold down the pickup roller slave assembly [4] so that the spring [3] is as shown;...
  • Page 147 CHAPTER 3 4) Slide the slave roller assembly [4] slightly 6) Slide the feeding roller assembly [10] to to the front. the right to detach. [10] Figure 3-8-14 7) Remove the bushing [11] and the bush- ing [12]. [12] Figure 3-8-12 Caution: Take care so that the bushing [6]will not slip off the bushing [7].
  • Page 148: C. Drive Mechanism

    CHAPTER 3 C. Drive Mechanism 3) Remove the 4 screws [4] and the ground- 1. Removing the paper feeder pickup ing wire [5]; then, detach the pickup clutch motor assembly [6]. 1) Disconnect the 4 connectors [1], and free the harness from the harness guide. Figure 3-8-16 Figure 3-8-18 2) Remove the 2 screws [2], and detach the...
  • Page 149 CHAPTER 3 6) Remove the gear [10], and detach the pa- D. PCBs per feeder pickup clutch [11]. 1. Removing the paper feeder controller 1) Remove the top plate. 2) Disconnect all connectors from the pa- per feeder controller PCB [1]. 3) Remove the 2 screws [2], and slide the paper feeder controller PCB [1] to detach.
  • Page 150: Chapter 4 Troubleshooting

    CHAPTER 4 TROUBLESHOOTING INTRODUCTION ....... 4-1 VII. STANDARDS AND TROUBLESHOOTING IMAGE ADJUSTMENTS ......4-31 FAULTS ........4-10 VIII. MAINTENANCE AND III. MEASURES AGAINST JAMS ..4-17 INSPECTION ......4-38 FEEDING FAULTS ....4-21 IX. ARRANGEMENT OF ELECTRICAL MALFUNCTIONS ...... 4-23 PARTS ........
  • Page 151: Introduction

    CHAPTER 4 I. INTRODUCTION A. Troubleshooting Flow Chart A fault occurring in the Printer is identified as being either of the following five: image fault, jam, feeding fault, malfunction, error status. If a fault occurs, isolate its cause using the flow chart, and then take the appropriate action give for the cause while keeping the following in mind: •...
  • Page 152 CHAPTER 4 Make initial checks. Turn on the power switch. Is the following message indicated: Is the Printer ready? See the descriptions for malfunctions. ‘Call Operator’ or ‘Call Service Person’? Can a test print See the descriptions for error status. be made? (Note 1) Make a test print.
  • Page 153 CHAPTER 4 Notes: 1. When making a test print, be sure to use the same source of paper used when the fault occurred. If the source is not known, try all sources to reproduce the symptom. 2. At times, the faulty image in question may not occur during test printing. If so, print from an external device, and take a guess in identifying the location of the fault;...
  • Page 154: Making Initial Checks

    CHAPTER 4 B. Making Initial Checks Before starting troubleshooting steps, make the following checks; if a fault is discovered, correct it and then advise the user on how to avoid it: 1. Installation environment a. The power supply voltage is ±10% of the rated voltage. b.
  • Page 155: C. Test Print

    CHAPTER 4 C. Test Print Test printing takes either of two forms: engine test printing or controller test printing. If a fault occurs in the Printer, make a test print to identify the symptom. 1. Engine test printing The Printer has a pattern consisting of horizontal lines (at intervals of about 0.6 mm). The Test Print switch is found at the rear of the Printer (Figure 1-4-2).
  • Page 156 CHAPTER 4 • PRINT JOB LOG Indicates a job log list showing the most recent 55 jobs. • CONTINUOUS TEST Makes continuos Test Prints. (The printer back to READY key after SHIFT key and ENTER key to cancel CONTINUOUS TEST.) •...
  • Page 157: Test Print

    CHAPTER 4 <TEST PRINT> Canon Inc., LBP-2000 Printer Configuration Page [1] TEST MENU [5] CONFIG MENU [12] JOB LOG MENU SHOW PAGE COUNT JAM RECOVERY = OFF AUTO PRINT LOG PER 50 JOBS = NO TEST PRINT AUTOCONT = ON...
  • Page 158 CHAPTER 4 The Configuration Page shown here is for a printer with the optional print server, hard disk, PS module, Flash ROM, and additional RAM memory installed. [1] TEST MENU Displays the test menu options. [2] PCL MENU Show the PCL print job settings, as determined by the PCL MENU options. [3] PS MENU(Only displayed if the optional Adobe PostScript 3 Modeule A-65 is installed) Displays the PostScript print job settings, as determined by the PS MENU options.
  • Page 159 CHAPTER 4 [15] PRINTER DETAILS Displays the printer ROM DIMM version, version numbers of any istalled options, and the page counts. 4 - 9...
  • Page 160: Troubleshooting Image Faults

    CHAPTER 4 II. TROUBLESHOOTING IMAGE FAULTS If the cause of the symptom is identified as being an ‘image fault’ in reference to the flow chart (Figure 4-1-1), isolate the cause as follows and take the appropriate action: Light: The output is obviously too light. Dark: The output is obviously too dark.
  • Page 161 CHAPTER 4 2-2. Dark <Possible Causes> 1. The image density setting is not correct. Action: Operate the external device to adjust the image density. 2. The contact of the leaf spring for the drum ground and the contact of the cartridge are poor. Action: If dirt is found, clean the contact.
  • Page 162 CHAPTER 4 2-4. Solid black <Possible Causes> 1. The contact of the leaf spring for the primary bias and the contact of the cartridge are faulty. Action: If dirt is found, clean the contact. If the problem is not corrected after cleaning, or deformation or damage is found, replace the faulty parts.
  • Page 163 CHAPTER 4 2-6. Soiled back <Possible Causes> 1. The paper is soiled. Action: Replace the paper with paper fresh out of package. At the same time, advise the user on the correct method of storing paper. 2. The setting and the type of paper used do not match. Action: Check the selected fixing mode, and change it to suit the type of paper used.
  • Page 164 CHAPTER 4 2-10. White spots <Possible Causes> 1. The cartridge is running out of toner. Action: Remove the cartridge from the Printer, and shake it as instructed in Chapter 1; then, fit it back into the machine. If the problem is not corrected, replace the cartridge. 2.
  • Page 165 CHAPTER 4 2-13. Fixing faulty. <Possible Causes> 1. The setting and the type of paper used do not match. Action: Correct the setting to suit the type of paper used. 2. The nip of the fixing assembly is not as indicated. Action: Replace the fixing assembly.
  • Page 166 CHAPTER 4 2-16. Image wobble <Possible Causes> 1. The setting and the type of paper used do not match. Action: Correct the setting to suit the type of paper used. 2. The transfer charging roller is faulty. Action: Replace the transfer charging roller. Table 4-2-1 Dirt or White Spots at Specific Intervals in the Images Symptom...
  • Page 167: Measures Against Jams

    CHAPTER 4 III. MEASURES AGAINST JAMS The Printer’s paper path can broadly be divided into the following 5 blocks: [5] [4] [2] [3] [1] Multifeeder pickup block [2] Cassette pickup block [3] Paper feeder pickup block [4] Transfer/feeding block [5] Fixing/delivery block Figure 4-3-1 If the fault in question has been identified as being a jam using the flow chart (Figure 4-1-1), find the location and then isolate the cause.
  • Page 168 CHAPTER 4 3. The lever of the multifeeder sensor does not move smoothly, or is damaged or deformed. Action: Fit it so that it moves smoothly. If damaged or deformed, replace it. 4. The position of the cam (manual feed roller) is wrong. Action: Check to be sure that the manual feed roller is correctly mounted.
  • Page 169 CHAPTER 4 3. A part in the pickup drive assembly is damaged. Action: Remove the pickup drive assembly, and replace any damaged part. 4. The paper feeder pickup motor (M201) is faulty. Action: Replace the paper feeder pickup motor. 5. The paper feeder pickup clutch (CL201) is faulty. Action: Disconnect the connector J3 of the paper feeder pickup clutch.
  • Page 170 CHAPTER 4 3-5. Fixing/delivery block <Possible Causes> 1. The fixing roller does not rotate smoothly. Action: Check the gear for wear or chipping. If a fault is found, replace the fixing assembly. 2. The fixing/separation claw is worn or damaged. Action: Replace the fixing assembly.
  • Page 171: Feeding Faults

    CHAPTER 4 IV. FEEDING FAULTS If the symptom has been identified as a feeding fault according to the flow chart (Figure 4-1-1), identify the location and correct the fault. 4-1. Double feeding <Possible Causes> 1. The paper is not of a recommended type. Action: Replace the paper.
  • Page 172 CHAPTER 4 4-3. Skew <Possible Causes> 1. The paper is not set correctly. Action: Set the paper against the paper guides at the left/right and the rear end of the cas- sette. 2. There is an accumulation of paper lint or dust on the registration roller or the feeding guide. Action: Clean the soiled area.
  • Page 173: Malfunctions

    CHAPTER 4 V. MALFUNCTIONS If the symptom has been identified as a malfunction according to the flow chart (Figure 4-1-1), take the following action: 5-1. AC power is absent. <Possible Causes> 1. The rated voltage is not present at the power outlet. Action: Advise the user that the rated voltage is not present at the power outlet.
  • Page 174 CHAPTER 4 5-4. Abnormal noise is heard from the fixing assembly. <Possible Causes> 1. The fixing roller gear is not mounted correctly. Action: If chipping is discovered on the fixing roller gear or the drive gear, replace the drive gear or fixing assembly. 2.
  • Page 175: Correcting A Fault Status Condition

    CHAPTER 4 VI. CORRECTING A FAULT STATUS CONDITION If the cause has been determined to be a “fault status condition” in relation to the Troubleshooting Flow Chart (Figure 4-1-1), be sure to go through the following: 6-1. ‘E000 CALL FOR SERVICE’ (fault in fixing assembly) ‘E001 CALL FOR SERVICE’...
  • Page 176 CHAPTER 4 6-3. ‘E110 CALL FOR SERVICE’ (scanner unit fault) <Possible Causes> 1. The connector of the BD signal line has poor contact. Action: Correct the connection of the connector J908 on the BD PCB and the connector J102 on the DC controller PCB. 2.
  • Page 177 CHAPTER 4 6-7. ‘LOAD <SIZE>IN <TRAYS>’ is indicated although paper of the selected size is inside the cassette. <Possible Causes> 1. The cassette detecting lever is damaged. Action: Replace the lever. 2. The cassette paper sensor is faulty. Action: Replace the cassette paper sensor. 3.
  • Page 178 CHAPTER 4 6-10. ‘CASSETTE 1 MISSING’ is indicated in the presence of a cassette. <Possible Causes> 1. The paper size detecting switch lever of the cassette is damaged. Action: Replace the paper size detecting switch. 2. The DC controller PCB is faulty. Action: Replace the DC controller PCB.
  • Page 179 CHAPTER 4 6-13. ‘PAPER JAM’ is indicated in the absence of a jam, and the Printer fails to be ready. <Possible Causes> 1. The registration paper sensor lever does not move smoothly. Or, it is damaged. Action: Mount it so that it moves smoothly. If damaged, replace it. 2.
  • Page 180 CHAPTER 4 6-17. ‘FLASH ERROR’ is indicated after replacing the optional flash ROM. <Possible Causes> 1. The video controller PCB is faulty. Action: Turn off the power switch, and then turn it on. If the problem is not corrected, mount the optional flash ROM once again.
  • Page 181: Standards And Adjustments

    CHAPTER 4 VII. STANDARDS AND ADJUSTMENTS A. Making Mechanical Adjustments 1. Checking the pressure (nip) of the pressure roller Caution: In the steps that follow, you will be asked to turn off the power switch while the Printer is in operation. Be sure to remove the option hard disk, if installed, before starting the steps;...
  • Page 182: Making Electrical Adjustments

    CHAPTER 4 B. Making Electrical Adjustments 1. Adjusting the leading edge margin VR101 (Figure 1-4-2) on the DC controller PCB is adjusted in the factory, not requiring adjust- ment in the field. If you have replaced the DC controller PCB in the field, however, be sure to make adjustments.
  • Page 183: Copying The Counter Readings

    CHAPTER 4 C. Copying the Counter Readings If you have replaced the video controller PCB, be sure to perform the following work: Caution: If you are mounting a hard disk (option), wait until you have copied the counter read- ings. 1) Remove the 2 EEPROMs (IC4, IC5) from the exiting video controller PCB.
  • Page 184: Variable Resistors (vr), Light-emitting Diodes (led), Check Pins, Jumpers, And Switches By Pcb

    CHAPTER 4 D. Variable Resistors (VR), Light-Emitting Diodes (LED), Check Pins, Jumpers, and Switches by PCB Of the VRs, LEDs, check pins, jumpers, and switches used in the Printer, those needed for servic- ing in the field are discussed. Do not touch the VRs or check pins into indicated in the tables; they are for use at the factory only, and require special tools and high accuracy.
  • Page 185 CHAPTER 4 2. Video controller PCB ROM DIMM EEPROM RAM DIMM Figure 4-7-5 Note: If you must replace the video controller PCB, be sure to remove the following from the old PCB and mount them back to the new PCB: RAM DIMM, ROM DIMM (except program ROM), EEP-ROM (indicated by dashed lines).
  • Page 186 CHAPTER 4 4. Control panel PCB Figure 4-7-7 5. Built-in print server (option) 4321 Figure 4-7-8 4 - 36...
  • Page 187 CHAPTER 4 Table 4-7-2 shows the DIP switch settings. Table 4-7-2 Switch Description Factory setting : set all settings stored on the print server to Switch 1 factory settings. OFF : use settings stored on the print server to start up. identify the following automatically at time of print server Switch 2 start-up: 10Base-T/100Base-TX, full-duplex/half-duplex.
  • Page 188: Transfer Charging Roller

    CHAPTER 4 VIII. MAINTENANCE AND INSPECTION A. Periodically Replaced Parts Note: A periodically replaced part is one that must be replaced at certain intervals to ensure a specific level of machine performance. (They must be replaced regardless of the presence/ absence of damage, as they will significantly affect the machine operation once they fail.) If possible, schedule the replacement to coincide with a scheduled service visit.
  • Page 189: Scheduled Servicing

    CHAPTER 4 2. Paper Feeder Table 4-8-2 As of August 2001 Part name Part No. Q’ty Average life Remarks Cassette pickup FF6-0981-000 80,000 pages To be replaced by the user. roller (Note 1) Cassette separation FB5-8099-000 80,000 pages To be replaced by the user. (Note 1) Notes: 1.
  • Page 190: Points To Note For Cleaning

    CHAPTER 4 D. Points to Note for Cleaning a. Cassette Pick Roller, Feeding Roll Use lint-free paper and alcohol. b. Manual Feed Pickup Roller Use lint-free paper and alcohol. If the user often uses label sheet or the like (apt to leave dirt) for the multimeter, thus causing pickup faults, advise the use of the manual feed tray cleaning tool.
  • Page 191: Standard Tools

    CHAPTER 4 E. Standard Tools You will need the following standard stools when servicing the Printer: Table 4-8-3 Tool name Tool No. Description Tool bag TKN-0001 Jumper wire TKN-0069 With a clip. Gap gauge CK-0057 0.02 to 0.3 mm Spring gauge CK-0058 For checking spring pressure (0 to 600 g).
  • Page 192: Special Tools

    CHAPTER 4 F. Special Tools You need not obtain tools other than those in the standard tools set. G. Solvents and Oils Table 4-8-4 Name Composition Uses Remarks Alcohol Alcohol, Cleaning: • Do not bring near fire. water, e.g., plastic, rubber. •...
  • Page 193: Arrangement Of Electrical Parts

    CHAPTER 4 IX. ARRANGEMENT OF ELECTRICAL PARTS A. Switches and Sensors • Printer PI103 PI102 Pl104 PI101 SW105 • Paper feeder PI201 PI202 SW201 Figure 4-9-1 4 - 43...
  • Page 194 CHAPTER 4 Table 4-9-1 Symbol Name Notation Description Switch Right door switch Switch Left door switch Switch SW105 Cassette paper size detecting switch Switch SW201 Paper feed paper size detecting switch Sensor PI101 Registration paper sensor Sensor PI102 Multifeeder paper sensor Sensor PI103 Delivery sensor...
  • Page 195: Clutches, Solenoids, And Motors

    CHAPTER 4 B. Clutches, Solenoids, and Motors • Printer M101 CL101 CL102 SL101 • Paper Feeder M201 CL201 Figure 4-9-2 4 - 45...
  • Page 196 CHAPTER 4 Table 4-9-2 Symbol Name Notation Description Solenoid SL101 Multifeeder pickup solenoid Clutch CL101 Cassette pickup clutch Clutch CL102 Registration clutch Clutch CL201 Paper feed pickup clutch Motor M101 Main motor Motor M201 Paper feeder pickup motor 4 - 46...
  • Page 197: Others

    CHAPTER 4 C. Others • Printer FM101 THSW101 TH101 H101 Figure 4-9-3 Table 4-9-3 Symbol Name Notation Description Thermistor TH101 Main thermistor (for detection of temperature at middle of fixing assembly surface) Thermistor TH101 Sub thermistor (for detection of temperature at edges of fixing assembly surface) Thermal THSW101...
  • Page 198: Pcbs

    CHAPTER 4 D. PCBs • Printer • Paper Feeder Figure 4-9-4 4 - 48...
  • Page 199 CHAPTER 4 Table 4-9-4 Name Description DC controller PCB DC load control Video controller PCB Image processing/various interface connections Power supply PCB DC power supply output Control panel PCB Control panel key input/LED indication Paper feeder controller PCB Paper feeder DC load control 4 - 49...
  • Page 200: Connectors

    CHAPTER 4 E. Connectors • Printer J104 J907 J108 J906 J109 J908 J102 J110 J905 J106 J910 J904 J911 J903 J105 J1201 J916 J909 J902 J912 J915 J914 J401 J107 J103 J101 J913 J1202 J901 Figure 4-9-5 4 - 50...
  • Page 201 CHAPTER 4 • Paper feeder J154 J155 J901/J1507 J153 J901/J1507 Figure 4-9-6 4 - 51...
  • Page 202 APPENDIX GENERAL TIMING CHART ..A-1 III. LIST OF SIGNALS ....A-5 GENERAL CIRCUIT DIAGRAM .. A-3 MESSAGES TABLE ....A-10...
  • Page 203: I. General Timing Chart

    APPENDIX I. GENERAL TIMING CHART General Timing Chart (1/1) • A4, 2 Sheets, Continuous Fixing roller 140˚C Power switch ON (unit: sec) Sequence WAIT*1 STBY INTR PRINT PRINT LSTR STBY WMUP WMUPR Target temperature control Temperature control based on paper type Fixing heater (H101) Pre-feed signal (/PRFD) Print start command (/PRNT)
  • Page 204 APPENDIX A - 2...
  • Page 205: Ii. General Circuit Diagram

    APPENDIX II. GENERAL CIRCUIT DIAGRAM General Circuit Diagram (1/2) Control panel LCD indicator PCB P101 Fixing heater LCD101 MT101 Thermal switch H101 ROLLER ERTH THSW101 MT102 Power switch Power supply PCB MT106 MT107 Control panel PU101 control PCB PCB104 J401 1 2 3 4 5 6 7 8 9 10 11 12 13 SW102 Delivery...
  • Page 206 APPENDIX General Circuit Diagram (2/2) To Printer or paper feeder DC controller PCB or Paper feeder Paper feeder option controller PCB Paper size ickup motor pickup clutch J101 or J4 detecting switch 1 2 3 4 5 6 7 8 9 10 11 CL201 M201 SW201...
  • Page 207: A. Inputs To And Outputs From The Dc Controller Pcb

    APPENDIX III. LIST OF SIGNALS A. Inputs to and Outputs from the DC Controller PCB Connector Notation Logic Remarks J101 /RXDO Input Pulse Machine internal communication signal /STB Output Strobe signal /SCLK Output Clock Clock signal /TXDO Output Pulse Machine internal communication signal /STERMU Output Option select signal...
  • Page 208 APPENDIX Connector Notation Logic Signal J104 /PPRDY Input Printer power ready signal /CCRT Output State change notice signal /SBSY Output Status busy signal /PCLK Output Pulse Printer clock signal /STS Output Status signal /RDY Output Ready signal /TOP Output TOP signal /CBSY Input Command busy signal...
  • Page 209 APPENDIX Connector Notation Logic Signal J105 +24V +24V +3.3V +3.3V +3.3V +3.3V +3.3V +3.3V +3.3V +3.3V RLYDRV Output Relay drive signal /FSRDRV Output Fixing heater drive signal /ZEROXI Input Zero-cross signal /100/200V Input AC power supply input identification signal (H: 100V model, L: 200V model) /HEATDT Input Fixing heater activation detection signal...
  • Page 210 APPENDIX Connector Notation Logic Signal J106 RGON Output Registration clutch drive signal +24V CSTFD Output Cassette pickup clutch drive signal J107 DOR24VIN Input Front door open/closed detection signal DOR24VOUT Output Front door open/closed detection signal J108 /MPSNSJ Output Multifeeder paper detection signal J109 FANDRV Output...
  • Page 211: Inputs To And Outputs From The Paper Feeder Controller Pcb

    APPENDIX B. Inputs to and Outputs from the Paper Feeder Controller PCB Connector Notation Logic Signal PSSN4 Input Cassette paper size 4 detection signal PSSN3 Input Cassette paper size 3 detection signal PSSN2 Input Cassette paper size 2 detection signal PSSN1 Input Cassette paper size 1 detection signal...
  • Page 212: Messages Table

    APPENDIX IV. MESSAGES TABLE a. JUST MESSAGE Message Meaning Action WARMING UP... The printer is warming up. The printer will be ready in a moment. READY The printer is online. The printer is ready to print. PRINTING Printing... The printer is printing. PAUSED The printer is offline.
  • Page 213 APPENDIX b. SERVICE CALL ERROR Message Meaning Action E000 A fuser error occurred. Perform the troubleshooting procedure de- CALL FOR SERVICE scribed in Section VI of Chapter 4. E001 A fuser overheating error CALL FOR SERVICE occurred. E003 A fuser low-temperature CALL FOR SERVICE error occurred.
  • Page 214 APPENDIX c. WARNING MESSAGE Message Meaning Action READY The toner is low. Remove the toner cartridge, slowly shake it 5-6 TONER LOW times, and then replace it. If this message is displayed again, replace the current toner cartridge with a new one. KEY NOT VALID A button that is not enabled Press the correct key to complete the current...
  • Page 215 APPENDIX d. NORMAL ERROR Message Meaning Action TONER CART No toner cartridge is in- Install the toner cartridge, and then press the MISSING stalled. Go key on the printer. LOAD <size> Out of paper. Load paper into printer. IN <trays> LOAD <size>...
  • Page 216 APPENDIX Message Meaning Action FLASH ERROR The optional Flash ROM Replace the optional Flash ROM. error occurred. WRITING DISK Unable to write to the printer Measure 1: Make sure that the printer hard ERROR hard disk. disk is installed correctly. Measure 2: Turn off the printer, and the turn it on again.
  • Page 217 APPENDIX e. The following messages are displayed on the SERVICE mode. Message Meaning Action NVRAM OK All NVRAMs work correctly. NVRAMx ERROR An error occurred in the Reinstall or replace the NVRAM. NVRAMx. WRITING NVRAMx A writing error occurred in Replace the NVRAM.
  • Page 218 APPENDIX The following messages are displayed as the HIDDEN function. Message Meaning Action COLD RESET A4 The printer is performing a Wait a moment for the operation to complete. cold reset with A4 to restore the factory default settings. COLD RESET LTR The printer is performing a Wait a moment for the operation to complete.
  • Page 219 Prepared by Consumer Imaging Products Quality Assurance Dept.1 Consumer Imaging Products Quality Assurance Div Office Imaging Products Quality Assurance Center CANON INC. REVISION 0 ( AUG. 2001 ) 5-1, Hakusan 7-chome, Toride-shi, Ibaraki 302-8501, Japan...
  • Page 220 CANON INC.

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