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 Epson AcuLaser C2900NRevision B Confidential 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 Epson AcuLaser C2900NRevision B Confidential 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 Epson AcuLaser C2900NRevision B Confidential 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 Epson AcuLaser C2900NRevision B Confidential 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 Epson AcuLaser C2900NRevision B Confidential 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 Epson AcuLaser C2900NRevision B Confidential 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
6 - 42 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 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 Epson AcuLaser C2900NRevision B 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