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.
6 - 25 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential GUIDE SIDE LGUIDE SIDE ASSY R HOLDER ASSY RETARD (Retard Roller) END GUIDE PLATE ASSY BOTTOM MiS06031SA
6 - 26 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 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 MiS06032SA
6 - 27 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B 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 MiS06033SA
6 - 28 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 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 MiS06034SA
6 - 29 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B 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 MiS06035SA
6 - 30 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B 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 MiS06036S A
6 - 31 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B 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 MiS06037SA
6 - 32 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 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.
6 - 33 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 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