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Epson C 2900 Manual

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    							6 - 34 Chapter 6   Principles of Operation
    Epson AcuLaser C2900NRevision B
    Confidential
    3.5 ROS ASSY 
    3.5.1 Major functions
    - ROS ASSY
    ROS ASSY is an exposure unit that generates laser beams to form electrostatic latent image on the 
    drum surface.
    In this manual, the ROS ASSY is referred to as ROS.
    The ROS mainly consists of the following parts:
    •  LD PWB
    •  Scanner ASSY
    •  SOS PWB
    •  Lens
    •  Mirror
    •  Window
    • LD PWB
    The LD PWB is comprised of four LDs (laser diodes) corresponding to Y, M, C, and K.
    Each LD converts the electric signals of incoming image data into laser wave or pulse. In order to 
    stabilize the laser light quantity during formation of an electrostatic latent image, the LD PWB 
    always monitors the laser light quantity to adjust it to the appropriate level. This is called APC 
    (auto power control).
    • Scanner Assy
    The Scanner Assy is comprised of the Scanner Motor that rotates at a constant speed and the 
    Polygon Mirror that is mounted on the motor shaft.
    The laser light output from the LD is irradiated onto the Polygon Mirror via the Mirror.
    The Polygon Mirror, provided with six reflecting mirror faces, changes the reflection angle of the 
    laser light as it rotates by the Scanner Motor, thereby allowing the laser light to scan the drum 
    along its axial direction. Scanning is performed using one reflecting mirror face for each line.
    • SOS PWB
    The SOS sensor on the SOS (start of scan) PWB converts an incoming laser beam, upon detec-
    tion, to an electric signal as the reference signal for starting scanning and transmits this signal to 
    the PWBA MCU.
    The SOS sensor signals are used to synchronize the starting point of the laser-beam scanning 
    with the starting point of the image writing.
    • Lens / Mirror / Window
    The laser light reflected from the Polygon Mirror reaches the drum surface via the Lens, Mirror, 
    and Window. The Lens corrects aberration, the Mirror secures an optical path, and the Window 
    prevents foreign matters from entering the ROS. 
    						
    							6 - 35 Chapter 6   Principles of Operation
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    LD PWB Polygon Mirror
    Scanner Assy
    SOS PWB Lens
    LensMirror
    Mirror Mirror
    Mirror
    Window ROS ASSY Rear view illustration
    SOS Sensor
    MiS06039SA 
    						
    							6 - 36 Chapter 6   Principles of Operation
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    3.6 TONER CARTRIDGE & DISPENSER
    3.6.1 Major functions
    - CONNECTOR CRUM (PL5.1.14)
    The CONNECTOR CRUM reads and writes the data of the CRUM.
    Printer specific information is stored.
    - MOTOR ASSY DISP YMCK (PL5.1.3)
    The dispense motor supplies the drive to the Agitator and Auger in the TONER CARTRIDGE, and 
    supplies toner to the developer.
    MOTOR ASSY DISP (K)
    MOTOR ASSY DISP (C)
    MOTOR ASSY DISP (M)
    MOTOR ASSY DISP (Y) TONER CARTRIDGE (K)
    CONNECTOR CRUM (K)
    TONER CARTRIDGE (C)
    CONNECTOR CRUM (C)
    TONER CARTRIDGE (M)
    CONNECTOR CRUM (M)
    TONER CARTRIDGE (Y)
    CONNECTOR CRUM (Y)
    MiS06040SA 
    						
    							6 - 37 Chapter 6   Principles of Operation
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    3.7 Drum Cartridge
    3.7.1 Major functions
    - Drum Cartridge (PL4.1.21)
    Drum Cartridge carries out a series of operation in the print process such as charging, and transfer.
    Drum Cartridge mainly consists of the following parts.
    Developer is an equipment which develops images in the print process.
    • Drum (Y) • Developer (Y)
    • Drum (M) • Developer (M)
    • Drum (C) • Developer (C)
    • Drum (K) • Developer (K)
    - CRUM
    Drum Cartridge specific information is stored.
    - Erase Lamp (LED ASSEMBLY) 
    The light of the LED is reflected by the HOLDER ASSY Erase.
    The light of the LED eliminates the charge on the drum.
    MiS06023KA Erase Lens Drum Cartridge
    Erase Lamp (K) LED ASSY  ERASE
    Erase Lamp (C)
    Erase Lamp (M)
    Erase Lamp (Y)
    Drum
    Drum (K)Erase Lens
    Drum (C)
    Drum (M)
    Drum (Y) 
    						
    							6 - 38 Chapter 6   Principles of Operation
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    Drum Cartridge
    Drum (K)
    Drum (C)
    Drum (M)
    Drum (Y)
    Developer (K)
    Developer (C)
    Developer (M)CRUM
    Developer (Y)
    Rear view illustration
    LED ASSY  ERASE
    MiS06041SA 
    						
    							6 - 39 Chapter 6   Principles of Operation
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    3.8 Drive
    3.8.1 Major functions
    - DRIVE ASSY MAIN (PL7.1.2) (Refer to 6.1 DRIVE ASSY MAIN)
    Supplies the drive to parts as follows.
    • DRIVE ASSY PH
    • TRANSFER ASSY
    • CHUTE ASSY FDR REGI
    • Drum Cartridge
    • DRUM (Y, M, C, K)
    - DRIVE ASSY SUB
    Supplies the drive to parts as follows.
    • FUSER UNIT
    • DEVELOPER (YMCK)
    DRIVE ASSY  SUBDRIVE ASSY  MAIN
    DRIVE ASSY  PH
    MiS06042SA 
    						
    							6 - 40 Chapter 6   Principles of Operation
    Epson AcuLaser C2900NRevision B
    Confidential - DRIVE ASSY PH (PL7.1.4)
    DRIVE ASSY PH transmits the driving force from the DRIV ASSY SUB (PL7.1.1) to relevant parts.
    The transmission channel is changed by the COLOR MODE SWITCHING SOLENOID in the DRIVE 
    ASSY PH to allow the driving force of the DRIVE ASSY MAIN (PL7.1.2) to reach the Black Devel-
    oper only.
    This is performed to ensure that the Yellow, Magenta, and Cyan Developers cannot be rotated by 
    the DRIVE ASSY SUB during B/W printing. 
    The COLOR MODE SWITCHING SENSOR detects the status of the transmission route (whether it 
    is set for B/W or full color).
    MiS06026KA
    [ FULL COLOR MODE ]
    MAGNET ROLL (Y) MAGNET ROLL (M)
    MAGNET ROLL (C)
    MAGNET ROLL (K)DRIVE ASSY  SUB
    DRIVE ASSY  PH Sub Motor
    COLOR MODE
    SWITCHING SENSOR
    COLOR MODE
    SWITCHING SOLENOID CAM C
    GEAR C
    GEAR D2 GEAR D4
    GEAR D3 IN
    Drive to
    MAGNET ROLL
    (Y), (M), (C)
    Drive from
    Sub Motor GEAR D3 OUTCAM C
    FLANGE D3 
    						
    							6 - 41 Chapter 6   Principles of Operation
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    MiS06027KA
    MAGNET ROLL (K)DRIVE ASSY  SUB
    DRIVE ASSY  PH Sub Motor
    GEAR D2 GEAR D4
    GEAR D3 IN
    Cutting of drive
    Drive from
    Sub Motor GEAR D3 OUTCAM C
    FLANGE D3
    [ BLACK and WHITE MODE ]
    COLOR MODE
    SWITCHING SENSOR
    COLOR MODE
    SWITCHING SOLENOIDCAM C
    GEAR C 
    						
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    3.9 Electrical
    3.9.1 Major functions
    - FAN (PL8.1.1)
    Dissipates heat out of the printer to prevent the printer from overheating.
    -SWITCH
    The SWITCH turns ON/OFF the AC power supply of the printer.
    - Low Voltage Power Supply (LVPS:PL8.2.1)
    The LVPS is provided in two types, 120V and 240V.
    Supplies AC power from the power source to the Fuser Unit heater and generates and supplies sta-
    ble low voltage DC power used for the logic circuit, etc.
    LVPS contains control circuit for the heater of the Fuser Unit, in addition to the power circuit.
    - Machine Control Unit (MCU:PL8.2.13)
    Controls printing operation based on the communication with the print controller and information 
    from the sensor/switch.
    Major functions are as follows:
    • Communication with the ESS.
    • Receive of information from the sensors or switches.
    • Control of Motor in DRIVE ASSY MAIN and DRIVE ASSY SUB.
    • Distributing low voltage DC power output from LVPS to each component
    • Control of ROS ASSY
    - High Voltage Power Supply (HVPS:PL4.1.19)
    Supplies high voltage to the following parts in the TRANSFER ASSY and Developer to perform 
    charging, development, and primary transfer.
    • BCR
    • BTR
    • Developer
    - PWBA EEPROM (PL8.2.16)
    Information unique to the printer is stored.
    - Electronic Sub System (ESS:PL8.1.7)
    The ESS connected to the MCU controls the entire system (Diagnostic, Interface and Image pro-
    cessing).
    - HUMIDITY SENSOR (SENSOR HUM:PL8.2.7)
    HUMIDITY SENSOR reads the temperature/humidity within the printer and converts the values to 
    voltage values.
    - OPERATOR PANEL (CONSOLE ASSY PANEL:PL1.2.3)
    OPERATOR PANEL displays the state of the printer using LED. 
    - INTERLOCK SWITCH (HARN ASSY INTERLOCK:PL8.2.5)
    INTERLOCK SWITCH is a switch that cuts the +24VDC power supply to the HVPS or Motor, etc. 
    upon the opening of the Front Cover. 
    						
    							6 - 43 Chapter 6   Principles of Operation
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    Confidential - WIRELESS ADAPTER (PL8.1.16)
    An adapter for enabling the network connectivity of the printer by wireless.
    - SIDE COVER SWITCH (PL5.1.9)
    SIDE COVER SW is a switch that detects the right side cover open.
    FA N
    SWITCHPWBA EEPROM
    HUMIDITY SENSORLow Voltage Power Supply
    High Voltage
    Power Supply OPERATOR PANEL
    MEMORY
    CARD
    Electronic Sub SystemMachine
    Control Unit
    WIRELESS ADAPTER
    INTERLOCK SWITCHSIDE COVER SWITCH
    MiS06043S A 
    						
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