Epson M2000 Service Manual

							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