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Epson C 2900 Manual

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    							6 - 24 Chapter 6   Principles of Operation
    Epson AcuLaser C2900NRevision B
    Confidential
    3. Functions of Major Functional Components
    Major functional components of the printer are described below with illustrations.
    These components are classified into the following blocks based on the configuration of the printer.
    • Paper tray
    • Paper Feeder
    • SSI & Regi Assy
    • Transfer Belt & Fuser Unit
    • ROS ASSY
    • TONER CARTRIDGE & Dispenser
    • Drum Cartridge
    • Drive
    • Electrical
    • Duplex
    • 250 Paper Tray (Option)
    3.1 Paper Tray
    3.1.1 Major functions
    - GUIDE SIDE ASSY R (PL2.1.8) / GUIDE SIDE L (PL2.1.6)
    The GUIDE SIDE ASSY R and GUIDE SIDE L can move in the paper transfer direction to determine 
    the paper size.
    - END GUIDE
    The END GUIDE can move in the paper transfer direction to determine the paper size. 
    - HOLDER ASSY RETARD (PL2.1.5)
    The HOLDER ASSY RETARD and the FEED ROLLER pinch the paper to prevent multiple sheet 
    feed.
    - PLATE ASSY BOTTOM (PL2.1.2)
    PLATE ASSY BOTTOM is locked to the bottom side when paper tray is pulled out from the paper 
    feeder and unlocked when paper tray is installed to the paper feeder. Pushes the paper against the 
    feed roll using a spring tension. 
    						
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    GUIDE SIDE LGUIDE SIDE ASSY R
    HOLDER ASSY RETARD (Retard Roller) END GUIDE
    PLATE ASSY  BOTTOM
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    3.2 Paper Feeder
    3.2.1 Major functions
    - Tray No Paper Sensor (SENSOR PHOTO: PL3.2.13)
    The Tray No Paper Sensor detects the presence/absence of print media in the paper tray based on 
    the position of ACTUATOR NO PAPER. (No paper: Sensor beam is blocked)
    - SOLENOID FEED MSI (PL3.1.11)
    Transmits the drive from the DRIVE ASSY MAIN to FEED ROLLER. (Refer to 6.4 DRIVE ASSY 
    SUB)
    Tray No Paper Sensor
    ACTUATOR NO PAPER
    (No Paper Position)
    Tray No Paper Sensor
    ACTUATOR NO PAPER
    PLATE ASSY
    BOTTOM
    Tray No Paper Sensor
    Paper
    ACTUATOR NO PAPER
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    Confidential - ROLL ASSY FEED (PL3.2.4)
    When the SOLENOID FEED MSI operates, the ROLL ASSY FEED starts rotating and the ROLL 
    ASSY FEED feeds the paper. (Refer to 6.4 DRIVE ASSY SUB)
    ROLL ASSY  FEED
    SOLENOID FEED MSI
    ROLL ASSY  FEED
    SOLENOID FEED MSIDRIVE ASSY  MAIN
    DRIVE ASSY  PH
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    3.3 SSI & Regi Assy
    - SENSOR PHOTO (SSI No Paper Sensor: PL3.2.13)
    The SSI No Paper Sensor detects the presence/absence of print media in the SSI tray by the 
    change in the actuator position.
    Upon detecting the sheet, the Regi Roll rotates for a predetermined duration to feed the sheet. The 
    sheet is fixed between the Rolls so that it may not fall from the SSI.
    The Rolls stop immediately when the Regi Sensor detects the presence of paper.
    ACTUATOR SSI
    (No Paper Position) SSI No Paper Sensor
    REGI ROLL
    ACTUATOR SSI SSI No Paper Sensor
    Paper
    REGI ROLL
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    Confidential - SENSOR PHOTO (Regi Sensor: PL3.2.13)
    The Regi Sensor detects that the lead edge of the print medium has reached the registration sec-
    tion. (No paper: Sensor beam is blocked)
    When the print medium is fed from the SSI, the Regi Sensor measures the sheet length (size).
    The duration for which the Regi Sensor is ON is converted into the paper length.
    ACTUATOR REGI IN ACTUATOR REGI IN
    PAPER Regi Sensor Regi Sensor
    From Paper tray
    ACTUATOR REGI IN
    (No Paper Position) Normal Position
    Regi Sensor
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    Confidential - CLUTCH ASSY DRV(PL3.1.1)
    The CLUTCH ASSY DRV transmits the driving torque from the DRIVE ASSY MAIN to ROLL ASSY 
    REGI(PL3.2.9) to feed the print medium to the fuser unit section from the paper tray, SSI, or Duplex 
    section. (Refer to 6.1 DRIVE ASSY MAIN)
    To place the toner image at an appropriate position on the print medium, the timing of feeding from 
    the Regi Assy is adjusted by the duration for which the CLUTCH ASSY DRV operates.
    ROLL ASSY REGI (Rubber)
    ROLL REGI METAL
    CLUTCH ASSY  DRV
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    Confidential 3.3.1 Control of paper size
    The printer doesn’t have switches for detecting paper size, and only length of paper is detected by the 
    Regi Sensor when feeding paper. If printing data and paper size don’t match, error is sent to the ESS.
    3.3.2 Paper detection by the Regi Sensor
    Since the paper path from the SSI to the Regi Sensor and that from the Paper Tray to the Regi Sensor 
    are different, the Regi Sensor is provided with the ACTUATOR REGI IN (PL3.2.11) and the ACTUA-
    TOR REGI ROLL (PL3.2.8). The ACTUATOR REGI ROLL detects the sheet from the SSI and detects 
    the tail edge of the paper from the paper tray. The ACTUATOR REGI IN detects the lead edge of the 
    paper from the paper tray. However, the movement of ACTUATOR REGI IN does not affect that of 
    ACTUATOR REGI ROLL.
    ACTUATOR REGI INACTUATOR REGI IN
    ACTUATOR
    REGI ROLL Detection of paper (Tail Edge) From SSIPAPER
    PAPER
    PAPER Regi Sensor
    Regi SensorRegi Sensor
    ACTUATOR
    REGI ROLL
    ACTUATOR REGI IN
    From Paper traySPRING
    REGI OUT
    SPRING ACT  REGI
    ACTUATOR
    REGI OUT
    ACTUATOR REGI IN ACTUATOR REGI ROLL
    Regi Sensor
    Regi Sensor
    Rear view illustration
    ACTUATOR REGI INACTUATOR REGI ROLL Normal Position
    Regi Sensor
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    3.4 Transfer Belt & Fuser Unit
    3.4.1 Major functions
    - TRANSFER ASSY (PL6.1.7)
    • Belt
    Belt feeds the paper to the direction of FUSER UNIT
    • SENSOR ADC
    SENSOR ADC reads the toner patch on the BELT, and converts it to voltage value. Voltage value 
    is used to control the density of toner. (Refer to 5.3.1 Potential Control)
    - FUSER UNIT (PL6.1.1)
    The FUSER UNIT fixes toner which was transferred onto the paper but not fixed by the heat and 
    pressure and feeds paper before and after being fixed.
    The FUSER UNIT mainly consists of the following parts:
    • Heat Roll • Pressure Belt
    • Heater Lamp • Roll Assy Exit
    • Thermostat • Exit Sensor
    • Temp. Sensor
     -  EXIT SENSOR
    Detects passage of print after fixed based on the change of position of the actuator. 
    						
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    Roll Assy  Exit
    Transfer ASSY
    BeltSENSOR ADC
    Blade Assy FUSER UNIT
    Heat Roll
    Heater LampThermostat
    Temp. Sensor
    (Contacted type)Temp. Sensor
    (Un-contacting type) Pressure BELT Rear view illustration
    Exit Sensor
    MiS06038SA 
    						
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