Epson M2000 Service Manual
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AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Technical Explanation of Print Process 222.2.3 DevelopmentThe latent image constituted on the drum is developed into a visible image. The developing roller contains a 3-pole (S-NS) magnet roller and an aluminum cylinder rotating around the magnet roller. Toner attracts to the magnet sleeve since it is powdery ink made of black resin bound to iron particles. Developing blade, magnetized by magnet, is positioned approximately 0.3 mm above the magnet sleeve to constitute a smooth layer of toner in accordance with the magnet sleeve revolution.The developing roller is applied with the AC-weighted, positive DC power source. Toner on the magnet sleeve is given a positive charge. The positively charged toner is then attracted to the areas of the drum which was exposed to the laser light. (The gap between the drum and the magnet sleeve is approximately 0.32 mm.) The non-exposed areas of the drum repel the positively charged toner as these areas maintain the positive charge.The developing roller is also AC-biased to ensure contrast in yielding by compensating the toner’s attraction and repelling action during development. Figure 2-10. Development section Figure 2-11. Developing section block diagram Blade magnet Magnet sleeve Magnet roller DLP screw A DLP screw B DLP case Developing blade DLPDRN Developing clutch YC808-6 B Developing rollerMagnet rollerMagnet sleeve Developing bias output HVPS Main Board Assy.
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Technical Explanation of Print Process 232.2.4 Transfer/SeparationThe transfer/separation section consists of the transfer roller, discharger brush and paper chute guide. A high voltage generated by the HVPS (High Voltage Power Supply) is applied to the transfer roller for transfer charging. Paper after transfer is separated from the drum. Figure 2-12. Transfer/separation section Figure 2-13. Transfer/separation section block diagram Transfer roller Transfer bushesPaper chute guide Discharger brush DC brush holder T Transferroller GND HVPS Transfer bias Dischargerbrush
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Technical Explanation of Print Process 242.2.5 CleaningAfter the transferring process, the drum needs to be physically cleaned of toner which is residual after the development process. The cleaning blade is constantly pressed against the drum and scrapes the residual toner off to the sweep roller. The waste toner is collected at the output end of the sweep roller and sent back to the toner container, into the waste toner reservoir. After the drum is physically cleaned, it then must be cleaned to the electrically neutral state. This is necessary to erase any residual positive charge, ready to accept the uniform charge for the next print process. The residual charge is canceled by exposing the drum to the light emitted from the eraser lamp (PWB). This lowers the electrical conductivity of the drum surface making the residual charge on the drum surface escape to the ground. Figure 2-14. Cleaning section Figure 2-15. Cleaning section block diagram Main frame Waste toner reservoir Drum unit Eraser lamp (PWB) Sweep roller Cleaning blade ERASER YC816-1 Drum Eraser lamp (PWB) Main Board Assy.
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Technical Explanation of Print Process 252.2.6 FusingThe toner on the paper is molten and pressed into the paper as it passes between the heat roller and the press roller in the fuser unit. The heat roller has a heater lamp inside which continuously turns on and off by the fuser thermistor to maintain the constant temperature onto the heat roller surface. The heat roller is resin coated by florin to prevent toner from accumulating on the roller after a long run. Care must be taken while handling the heat roller not to scratch the roller surface as doing so may result in print problems. Fuser temperature is optimized to the paper type. The heat roller has four separators (claws) which are continuously in contact with its surface. These separators (claws) prevent the paper on which toner has been fused from being wound around the heat roller causing paper jam. The press roller is made of the heat-resistant silicon rubber. This roller is used to strongly press the paper towards the heat roller by means of press springs. The temperature of the heat roller is constantly monitored by the main board assy. using the fuser thermistor. Should the temperature of the heat roller exceed the predetermined value, the fuser thermal cutout is activated to effectively disconnect the heater lamp from power. Figure 2-16. Fuser section Figure 2-17. Fuser section block diagram Upper fuser frame Lower fuser frame Heat roller Separators Fuser heater lamp Fuser thermal cutout Fuser thermistor Actuator (exit sensor)Press rollerExit sensor Fuser lever L (R) Press spring holders Press springsFuser bushes NL THERMHEATNSLEEPZCROSS YC102-1YC102-3 YC103-6YC103-7YC103-8 YC811-5YC811-6YC811-3YC811-16 Fuser unit Fuser thermistor Fuser heater lampFuser thermal cutout LVPS Main Board ASSY. HVPS
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Technical Explanation of Print Process 262.2.7 Paper exit sectionThe paper exit section transports the paper which passed the fuser unit towards the top tray. The paper which passed through the fuser unit turns on the actuator (exit sensor) in the fuser unit, and is led by the guide comprised of the rear cover, frame and the FD cover guide, finally reaching the upper FD roller. The paper is delivered to the top tray by the rotation of the upper FD roller. Figure 2-18. Paper exit section Figure 2-19. Paper exit section block diagram Rear coverExit roller Middle pulley Fuser exit pulleyExit pulleyUpper FD roller Actuator (exit sensor)Exit sensor Top tray FD cover EXITN YC807-3 Fuser unit Exit sensor Main Board ASSY.
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Technical Explanation of Print Process 272.2.8 Duplex/conveying sectionThe duplex/conveying section consists of conveying path which sends the paper sent from the eject section to the paper feed/conveying section when duplex printing. Figure 2-20. Duplex/conveying section Figure 2-21. Duplex/paper conveying section block diagram DU cover B DU holder Middle pulley B DU roller Feed pulley Feed roller Lower base cover EXITNDUDR1DUDR2 YC807-3YC817-1YC817-3 Fuser unit Exit sensor Duplex solenoid Main Board ASSY.
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Paper Feed 282.3 Paper FeedPaper feed/conveying section consists of the paper feed unit that feeds paper from the cassette and the MP tray paper feed unit that feeds paper from the MP tray, and the paper conveying section that conveys the fed paper to the transfer/separation section.2.3.1 Cassette paper feed section Figure 2-22. Cassette paper feed section Figure 2-23. Cassette paper feed section block diagram Feed holder Paper feed roller Retard guide Bottom plate Paper sensor Retard holder Retard roller Pickup roller Actuator Cassette base (paper sensor) FEDDRN MMOTRDYN YC806-3Paper sensor Paper feed Clutch Main motor Main Board ASSY. PA P E RMOTCLKREMOTEN YC808-4YC805-3YC805-4YC805-5
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Paper Feed 292.3.2 MP tray paper feed section Figure 2-24. MP tray paper feed section Figure 2-25. MP tray paper feed section block diagram MP paper sensor MPF frame Actuator (MP paper sensor) MPF guide R/L MPF MPF upper middle tray tray MPF base MPF turn guide MPF bottom plate MPF separator MPF friction pad Paper feed rollerMPF separation pad MMOTRDYN YC804-3 MPFDRN MP paper sensor MP paper feed solenoid Main motor Main Board ASSY. HANDSN YC809-2 MOTCLKREMOTEN YC805-3YC805-4YC805-5
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Paper Feed 302.3.3 Paper conveying section Figure 2-26. Paper conveying section Figure 2-27. Paper conveying section block diagram Lower registration roller Upper registration roller Actuator (registration sensor) Registration sensor Feed pulley MMOTRDYN REGDRN Registration clutch Main motor Main Board ASSY.YC811-11 Registration sensorHVPS REGN YC808-2 MOTCLKREMOTEN YC805-3YC805-4YC805-5
AcuLaser M2000D/M2000DN/M2010D/M2010DN Revision BOPERATING PRINCIPLES Paper Feed 312.3.4 Optional cassette paper feed section Figure 2-28. Optional cassette paper feed section Figure 2-29. Paper feeder block diagram Cassette cover PF middle pulley Cassette holder Middle roller Actuator (PF paper feed sensor) Feed bracket PF paper feed sensorFeeder pin Top cover PF Main BoardTop framePF paper sensorBottom plateActuator (PF paper sensor) PF cassette switch Pickup roller Bottom pad Paper feed roller Retard holder Retard roller Retard guide Cassette base Paper feederinterface connectorPaper feederinterface connector PFSELPFSEL PFSEL signalprocessing +3.3 V+24 V+3.3 V+24 V UARTUART PF paper conveying clutch LVPS Main Board ASSY. Controlcircuit Cassette open/closedetection circuit Paperdetectioncircuit PrinterPaper feeder 1 Paper feeder 2 PF Main Board CPU PF paper sensorPF cassetteswitch PF paperfeed clutchPF paperfeed motor PF paperfeed sensor