Canon MF8100 Series Service Manual

[Page 1] Canon MF8100 Series

Jan 20 2006 Service Manual MF8100 Series LaserBase MF8180C ...

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Application This manual has been issued by Canon Inc. for qualified persons to learn technical theory, installation, maintenance, and repair of products. This manual covers all localities where the products are sold. For this reason, there may be inf...

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Introduction Symbols Used This documentation uses the following symbols to indicate special information: Symbol Description Indicates an item of a non-specific nature, possibly classified as Note, Caution, or Warning. Indicates an item requiring care...

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Introduction The following rules apply throughout this Service Manual: 1. Each chapter contains sections explaining the purpose of specific functions and the relationship between electrical and mechanical systems with refer- ence to the timing of ope...

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Contents Contents Chapter 1 PRODUCT DESCRIPTION 1.1 Product Specifications ................................................................................................................................1- 1 1.1.1 Product Specifications ...............

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Contents 2.3.2 Driving and Controlling the High-Voltage System..................................................................................................2- 14 2.3.2.1 Outline........................................................................

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Contents 2.5.3.3 Fixing Unit Failure Detection.................................................................................................................................................. 2- 36 2.6 Engine Control System.............................

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Contents 3.2.8.2 Removing the Face-Up Cover ............................................................................................................................................... 3- 13 3.2.9 Main Drive Unit .....................................

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Contents 3.2.16.12 Removing the Shield Plate ................................................................................................................................................. 3- 32 3.2.16.13 Removing the Fan Duct.........................

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Contents 3.3.1.1 Removing the Rear Cover ..................................................................................................................................................... 3- 51 3.3.1.2 Removing the Scanner Unit ......................

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Contents 3.3.10.3 Removing the SCNT Board Unit .......................................................................................................................................... 3- 69 3.3.10.4 Removing the ADF Unit ..............................

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Contents 3.5.3.14 Removing the Left Frame..................................................................................................................................................... 3- 89 3.5.3.15 Removing the Fan Duct .........................

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Contents 3.5.9 Transfer Charging Roller .....................................................................................................................................3- 109 3.5.9.1 Removing the Transfer Charging Roller ...........................

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Contents 3.6.2.11 Removing the Cassette Feeder ......................................................................................................................................... 3- 129 3.6.2.12 Removing the Cassette Paper Sensor..................

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Contents 3.6.9.5 Removing the Right Cover................................................................................................................................................... 3- 147 3.6.9.6 Removing the Left Cover .........................

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Contents 3.7.6 Fixing Motor .........................................................................................................................................................3- 165 3.7.6.1 Removing the Rear Cover .................................

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Contents 5.5.2.2 SSSW-SW14 ........................................................................................................................................................................... 5- 7 5.5.2.3 SSSW-SW18 ...............................

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Contents ...

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Chapter 1 PRODUCT DESCRIPTION ...

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Contents Contents 1.1 Product Specifications....................................................................................................................................................1-1 1.1.1 Product Specifications ............................

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Chapter 1 1-1 1.1 Product Specifications 1.1.1 Product Specifications 0012-0205 Body installation method desktop Exposure Method by semiconductor laser (2-beam laser) Development Method contact development Transfer Method primary transfer: by transfe...

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Chapter 1 1-2 Option none Applicable lines Applicable line analog (1-line) subscriber line (PSTN) Handset none Transmission method half-duplex Transmission control protocol ITU-T T.30 binary Modulation method G3 image signal: ITU-T V.27ter (4.8k, ...

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Chapter 1 1-3 1.2 Names of Parts 1.2.1 External View 0007-4608 F-1-1 F-1-2 [1] Operation panel [7] Front cover [2] ADF (Auto Document Feeder) [8] Cassette [3] Document feeder tray [9] Platen glass cover [4] Document guides [10] Platen glass [5] Outpu...

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Chapter 1 1-4 1.2.2 Cross Sectional View 0007-4617 F-1-3 1.2.3 Major Unit 0007-4618 F-1-4 [1] Laser/scanner unit [14] Registration roller unit [2] Developing cylinder [15] Secondary transfer roller [3] Photosensitive drum [16] Auxiliary ITB cleanin...

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Chapter 1 1-5 1.2.4 Major Component 0007-4619 F-1-5 1.3 Safety 1.3.1 Safety of the Laser Light 0007-4966 Laser light can prove to be hazardous to the human body. The machine's laser unit is fully enclosed in a protective housing and external cov...

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Chapter 1 1-6 DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS. 1.3.5 CDRH Ordinances 0011-0549 The Center for Devices and Radiological Health (CDRH) of the US Food and Drum Administration put into force ordinances related to laser products...

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Chapter 1 1-7 1.5.2 Power-on Sequence 0008-1693 The power-on sequence is the first operation executed by loads based on the firmware previously stored in the printer. It is indicated in the flowchart below. The power-on sequence is executed from when...

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Chapter 2 TECHNICAL REFERENCE ...

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Contents Contents 2.1 Document Feed and Exposure System...........................................................................................................................2-1 2.1.1 Overview/Configuration ..........................................

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Contents 2.3.6 Drum Cartridge .......................................................................................................................................................................... 2-21 2.3.6.1 Outline ...............................

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Chapter 2 2-1 2.1 Document Feed and Exposure System 2.1.1 Overview/Configuration 2.1.1.1 Overview 0008-1957 The following are the major specifications, control mechanisms, and functions associated with the original feed/exposure system: T-2-1 2.1.1.2...

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Chapter 2 2-2 F-2-2 T-2-3 Reading from the ADF To avoid skew feeding, documents loaded on the document tray are retained in the horizontal direction by the slide guide. Then, the documents are fed to the sep- aration roller by the pickup roller, an...

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Chapter 2 2-3 F-2-4 *1: black shading correction (the dark output analog level is adjusted so that the image density digital level is '0'). *2: scanning lamp warm-up (lasts until the temperature of the scanning lamp stabilizes). *3: gain co...

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Chapter 2 2-4 F-2-6 2.2 Laser Exposure 2.2.1 Overview/Configuration 2.2.1.1 Outline 0007-4973 The laser/scanner system forms a latent image on the photosensitive drum according to the VIDEO signals sent from the SCNT Board. This system consists of ...

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Chapter 2 2-5 8) When the four-sided mirror rotates at a constant speed, the laser beam striking the photosensitive drum scans on the drum at a constant speed. 9) When the photosensitive drum rotates and the laser beam scans on the photosensitive dru...

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Chapter 2 2-6 2) Automatic power control (APC) 3) Horizontal synchronization control 4) Image mask control 2.2.2.2 Laser Emission Control 0008-1542 In this control, the laser diodes (LD1, LD2) are turned on/off based on the VIDEO signals. When the ...

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Chapter 2 2-7 2.2.3 Controlling the Laser Scanner Motor 2.2.3.1 Outline 0008-2075 The control is utilized to rotate the scanner motor in order to strike laser beams to a proper position on the photosensitive drum. The circuit diagram of the scanner m...

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Chapter 2 2-8 F-2-12 2.3.1.2 Image Formation Process 0007-4977 An image formation process is the basic procedures of operations for image formation. The process can be divided into 5 blocks and 12 steps. By performing steps in each block, a toner i...

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Chapter 2 2-9 5) ITB cleaning block Cleans residual toner on the photosensitive drum and ITB. Step 9: Auxiliary ITB cleaning roller charging - Residual toner on the ITB is charged in order to be held on the ITB. Step 10: ITB cleaning roller charging ...

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Chapter 2 2-10 F-2-17 Step 3: Auxiliary development In this step, CPU applies DC bias onto the toner that was not charged by frictional electrification. Here, the toner becomes uniformed negative potential. The printer charges the uncharged toner b...

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Chapter 2 2-11 F-2-19 Step 6: Secondary transfer The toner on the ITB is transferred onto paper in this step. A DC positive bias is applied to the secondary transfer roller to charge the back side of a fed paper. This allows the toner on the ITB to t...

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Chapter 2 2-12 The machine uses an on-demand method, which requires a low thermal capacity. The method enables the machine to start up quickly and its heater to use little power while the machine is in a standby state. The machine may therefore be ...

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Chapter 2 2-13 a DC positive bias onto the ITB and a DC negative bias onto the drum, to return the residual toner to the drum. F-2-25 Step 12: Drum cleaning In this step, the residual toner is cleaned from the drum to prepare for the next print opera...

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Chapter 2 2-14 2.3.2 Driving and Controlling the High-Voltage System 2.3.2.1 Outline 0011-6381 In this circuit, biases are applied to the primary charging roller, developing cylinder, primary transfer roller, secondary transfer roller, auxiliary IT...

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Chapter 2 2-15 In full-color printing, as four toner layers in each colors are piled up on the ITB in primary transfer, the holding force of toner weakens as the transfer process progresses for the 1st color, 2nd color... Therefore, after transferrin...

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Chapter 2 2-16 2.3.3.2 Image Density Calibration (D-max) Control 0008-1704 This control is performed to stabilize the image density of the printer engine. The DCNT Board forms density patterns in each color on the ITB as varying the developing bias...

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Chapter 2 2-17 F-2-30 2.3.4.3 Developing Rotary Engaging Control 0008-1708 This control is utilized to engage a developing cylinder in the rotary to the drum in order to transfer the toner image on the drum onto the ITB. In rotary engaging control, t...

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Chapter 2 2-18 F-2-31 2.3.4.4 Developing Rotary Position Detection 0008-1709 This printer has a function of detecting the rotary engaging position between the rotary and drum determined in the developing rotary engaging control. This detection is p...

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Chapter 2 2-19 2.3.5 Toner Cartridge 2.3.5.1 Outline 0007-4983 The toner cartridge has a function of forming a visible image on the drum with toner. There are four toner cartridges in Y, M, C, and Bk, which are the same in structure. The following in...

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Chapter 2 2-20 A mechanism used in this control is also used in a developing rotary engaging operation. The developing rotary position detection is also performed by the DCNT Board monitoring the rotary engaging sensor (PS712). F-2-34 2.3.5.4 Cart...

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Chapter 2 2-21 F-2-35 Note 1. In full-color printing, the detection is performed for the cartridges in each color. In monochrome printing, it is performed just for the Bk cartridge. Note 2. If the toner level written in the memory tag is lower than t...

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Chapter 2 2-22 F-2-36 The cartridge consists of the photosensitive drum, primary charging roller, waste toner transport plate, etc. These parts are driven by the main motor (DCM701). This cartridge performs engaging operations for two rollers, the ...

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Chapter 2 2-23 F-2-37 2.3.6.3 Memory Tag 0008-1712 The memory tag is a non-volatile memory built into the drum cartridge. It stores cartridge usage condition data. The DCNT Board detects drum cartridge usage conditions by reading and writing memory d...

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Chapter 2 2-24 F-2-38 2.3.6.4 Detecting the ITB Home Position 0008-1713 The machine checks the ITB home position to ensure the correct image write start position using the ITB home position sensor (PS71), which checks the position with reference to...

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Chapter 2 2-25 F-2-39 2.3.6.5 Drum Cartridge Presence Detection 0008-1714 This detection is utilized to detect the presence of the drum cartridge. When the power is turned on or the top cover is closed, the DCNT Board determines the presence or absen...

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Chapter 2 2-26 F-2-40 2.3.6.6 Checking the Life of the Drum Cartridge 0008-1715 a. Outline The machine uses the following mechanism to check the life of the drum cartridge. When the power is turned on, the upper cover is closed, or a print job is o...

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Chapter 2 2-27 F-2-41 2.3.7 Secondary Transfer Mechanism 2.3.7.1 Outline 0008-1716 The transfer unit has a function of secondarily transferring the toner transferred primarily on the ITB onto paper. The unit is structured with the secondary transfer ...

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Chapter 2 2-28 F-2-42 2.3.7.2 Secondary Transfer Roller Engaging Control 0008-1717 This control is utilized to perform an engaging/disengaging operation between the secondary transfer roller and ITB in order to transfer the toner on the ITB to pape...

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Chapter 2 2-29 F-2-43 2.3.7.3 Secondary Roller Position Detection 0008-1719 This printer has a function of detecting the engaging position of the secondary transfer roller between the roller and ITB. The home position of the roller is detected by the...

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Chapter 2 2-30 F-2-44 2.4 Pickup and Feed System 2.4.1 Overview/Configuration 2.4.1.1 Overview 0007-4988 The pickup/feed system serves to pick up and move paper, and it consists of various feed rollers. The machine possesses 2 inlet slots for paper...

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Chapter 2 2-31 F-2-45 PS1: Fixing delivery paper sensor PS711: Registration paper sensor PS718: Multi-purpose tray paper sensor PS720: Front fixing paper detection sensor DCM701: Main motor PM702: Fixing motor SL92: Multi-purpose tray pick-up solenoi...

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Chapter 2 2-32 3. controls the speed at which paper is moved to suit the temperature inside the machine 2.4.2 Other Control 2.4.2.1 Skew Correction Function 0008-1720 This function is utilized to correct the skew of the paper to be fed, using the r...

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Chapter 2 2-33 F-2-48 2.4.3 Detection Jams 2.4.3.1 Jam Detection Outline 2.4.3.1.1 Outline 0007-4990 To detect the presence of paper and whether paper has been correctly fed, the following paper sensors are provided: - Registration sensor (PS711) - ...

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Chapter 2 2-34 2.4.4 Cassette Pickup Unit 2.4.4.1 Pickup from the Cassette 0008-2078 When the cassette is used as the source of paper, the machine operates as follows to make sure that a single sheet of paper is picked from the cassette: 1. When th...

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Chapter 2 2-35 The controls and functions in the fixing control circuit are described next. 2.5.2 Various Control Mechanisms 2.5.2.1 Controlling the Temperature of the Fixing Unit 2.5.2.1.1 Heater Temperature Control 0011-6408 This function detects a...

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Chapter 2 2-36 1. Sets the FIXING HEATER DRIVE (FSRD) signal "L" through the ASIC and shuts off the heater. 2. Sets the RELAY DRIVE (RLD) signal "L" through the ASIC. 3. Sets the RELAY DRIVE (RLD-) signal "L" through t...

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Chapter 2 2-37 2.6.2 DC Controller (DCNT) 2.6.2.1 Outline 0008-1725 The DCNT Board, which is controlled by the CPU in it, controls operation sequences for the printer. When the power is turned on and DC power is supplied from the power supply unit to...

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Chapter 2 2-38 e. Developing rotary motor driver IC (IC103) It controls the developing rotary motor. f. Toner cartridge motor driver IC (IC104) It controls the toner cartridge motor. g. Fixing motor driver IC (IC106) It controls the fixing motor....

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Chapter 2 2-39 F-2-53 The operations of the main motor are discussed next. The CPU in the DCNT Board rotates the motor by setting the /MAIMACC signal "L" through the ASIC. The CPU monitors the MAIN MOTOR SPEED DETECTION (MAIMFG) signal. The...

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Chapter 2 2-40 2) When the pulse count for ENCODER DETECTION signal does not fit in the prescribed range, (within -/+ 200 of a targeted pulse count memorized by CPU )after a period of time from the start of the drive when the developing rotary moto...

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Chapter 2 2-41 2.6.3 System Controller (SCNT) 2.6.3.1 Outline 0008-2317 The following is the functional composition of the SCNT board: F-2-57 T-2-10 T-2-11 2.6.3.2 Canon Advanced Printing TechnologyÅ@(CARPS) 0008-2319 Canon Advanced Raster Printing ...

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Chapter 2 2-42 compatible. - It turns the resulting GDI-compatible source data into dot matrix data on the host computer and sends the result to the host computer. - It allows making selections to set up a printing environment using dialog boxes on...

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Chapter 3 DISASSEMBLY AND ASSEMBLY ...

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Contents Contents 3.1 Cartridge Removal at Trouble Eruption Cartridge Removal at Trouble Eruption ........................................................3-1 3.1.1 Cartridge Removal at Trouble Eruption ...................................................

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Contents 3.2.9.10 Removing the Shield Plate.......................................................................................................................................................................... 3-17 3.2.9.11 Removing the Registrat...

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Contents 3.2.17.7 Removing the Face-Down Cover................................................................................................................................................................3-36 3.2.17.8 Removing the Top Cover ..........

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Contents 3.3.3.3 Removing the SCNT Board Unit.................................................................................................................................................................. 3-54 3.3.3.4 Removing the ADF Unit...........

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Contents 3.3.13.3 Removing the SCNT Board Unit ................................................................................................................................................................3-72 3.3.13.4 Removing the Speaker ...........

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Contents 3.5.4.7 Removing the Top Cover.............................................................................................................................................................................. 3-92 3.5.4.8 Removing the Left Frame...

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Contents 3.5.10.9 Removing the Registration Clutch ............................................................................................................................................................3-113 3.5.10.10 Removing the Main Drive Ass...

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Contents 3.6.3.9 Removing the Right Frame......................................................................................................................................................................... 3-133 3.6.3.10 Removing the Left Frame ...

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Contents 3.6.9.16 Removing the Registration Detection PCB...............................................................................................................................................3-150 3.6.10 Main Motor .............................

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Chapter 3 3-1 3.1 Cartridge Removal at Trouble Eruption Cartridge Removal at Trouble Eruption 3.1.1 Cartridge Removal at Trouble Eruption 0007-8336 If you removed the cartridge as you normally would in response to a fault in the machine, you could da...

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Chapter 3 3-2 F-3-3 5) Repeat the steps 3) and 4) to remove the toner cartridges for each color. 3.1.3 Drum cartridge removal 0007-8338 1) Open the top cover unit and remove the drum cartridge. When removing the drum cartridge with the top cover u...

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Chapter 3 3-3 F-3-8 2) Open the reader assembly [1] and the top cover [2]. F-3-9 3) Remove the 2 screws [1] from the side; then, remove the 3 claws [2] to detach the right cover [3]. F-3-10 MEMO It is difficult to release three claws [2]. If you rel...

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Chapter 3 3-4 F-3-14 F-3-15 3.2.1.5 Removing the Lower Front Cover 0007-6986 1) Free the claw [1] using a flat-blade screwdriver; then, slide the lower cover [2] to the left to detach. F-3-16 3.2.1.6 Removing the Front Cover 0007-6987 1) Push the 2...

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Chapter 3 3-5 F-3-21 3.2.3 Top Cover 3.2.3.1 Removing the Cassettes 0007-6972 1) Hold the grip, and take out the cassette. 3.2.3.2 Removing the Rear Cover 0007-6989 1) Disconnect the cable [1] of the power supply assembly. 2) Open the face-up cover [...

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Chapter 3 3-6 F-3-28 5) Remove the 6 screws [1], and lift the reader unit to detach. F-3-29 3.2.3.4 Removing the Right Cover 0007-7013 1) Remove the 2 screws [1] of the side; then, remove the 3 claws [2] to detach the left cover [3]. F-3-30 F-3-31 ...

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Chapter 3 3-7 3.2.3.8 Removing the Top Cover 0007-7041 1) Remove the claw [1], and detach the ring gear [2]. 2) Free the link lever [3] from the shaft [4]. F-3-36 3) Remove the 3 binding screws [1] and 2 TP screws [2]; then, disconnect the connector ...

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Chapter 3 3-8 F-3-41 3.2.4 Right Cover 3.2.4.1 Removing the Cassettes 0007-6969 1) Hold the grip, and take out the cassette. 3.2.4.2 Removing the Rear Cover 0007-6975 1) Disconnect the cable [1] of the power supply assembly. 2) Open the face-up cov...

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Chapter 3 3-9 F-3-47 MEMO It is difficult to release three claws [2]. If you release the lowest one first, the second lowest, and then the top, it becomes easy. F-3-48 3.2.5 Left Cover 3.2.5.1 Removing the Cassettes 0007-6970 1) Hold the grip, and t...

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Chapter 3 3-10 F-3-53 3) Remove the 2 screws [1] of the side; then, remove the 3 claws [2] to detach the right cover [3]. MEMO It is difficult to release three claws [2]. If you release the lowest one first, the second lowest, and then the top, it...