Epson Aculaser M 2000 Service Manual

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 41
Confidential2.2.4  Photoconductor Unit section (PU section)2.2.4.1  Composition
Figure 2-11.  Composition
2.2.4.2  Drive
Figure 2-12.  Drive Overview
4038T2C010AA4038T2C009AA
4039T2C107AA
Photoconductor Unit/Y, M, C
Photoconductor Unit/K
Cleaning Blade PC Drum/Y, M, C, K
Toner Collecting Screw
Developing Unit/ 
Y, M, C, K
PC Drum Charge Corona/
Y, M, C, K
Developing 
Clutch/K (CL4)
Color PC Drum 
Motor (M2)
Color Developing 
Motor (M3)
Main Motor (M1) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 42
Confidential2.2.4.3  OperationPU LIFE CONTROLEach PU has IC chip that detects a new PU, keeps track of the service life of 
the PU and installation.†
New PU detection„
New PU is detected when the Main Power Switch is turned ON and the 
Front Door is closed.
„
When a new PU is detected, a TCR adjustment sequence is carried out.
Figure 2-13.  Detection of new PU
†
When life is reached„
PU Life is detected by the PU Life counter value.
„
When the PU Life counter value is reached to the near life value, the 
warning message Photocon xxxx Needed Soon is displayed.
„
When the PU Life counter value is reached to the life value, the 
warning message Replace Photocon xxxx is displayed.
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0
4038T2C009AA
Operation when a new PU is detected
Transfer Belt 
is retractedTCR 
automatic 
adjustmentTransfer Belt 
cleaning
1st image transfer/
auto transfer 
voltage control 
adjustment
Image 
stabilization
Transfer 
Belt is 
retractedTransfer Belt 
cleaning
1st image transfer/
auto transfer 
voltage control 
adjustment
Operation when a new PU is not detected
Image 
stabilization 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 43
Confidential2.2.5  Photo Conductor section2.2.5.1  Composition
Figure 2-14.  Composition
2.2.5.2  DrivePC DRUM DRIVE MECHANISMTwo independent PC Drum Motors (for color and monochrome) are used for 
the drive mechanism.The Color PC Drum Motor drives the PC Drums/Y, M, and C, while the Main 
Motor drives the PC Drum/K.
.
Figure 2-15.  Drive overview
4038T2C013AA4036ma2338c0
Charge Transport Layer (CTL)Charge Generating Layer (CGL)
Aluminum Cylinder
PC Drum
Main Motor (M1)
PC Drum/K
PC Drum/C
PC Drum/M
PC Drum/Y
Color PC Drum Motor (M2) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 44
Confidential2.2.6  Charge Corona section2.2.6.1  Composition
Figure 2-16.  Composition
4038T2C027AA
4039T2C108AA
Comb
Electrode
Grid Mesh
Grid Mesh
Cleaning Blade
Comb Electrode/Y, M, C, K 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 45
Confidential2.2.6.2  OperationPC DRUM CHARGE CORONA ON/OFF CONTROLThe grid voltage (Vg) applied to the Grid Mesh is controlled through the image 
stabilization control.
CLEANING/MAIN ERASE MECHANISM1. The Cleaning Blade is pressed up against the surface of the PC Drum, scraping 
residual toner off the surface (forward blade system).2. Toner, which has been scraped off the surface of the PC Drum, is fed by the Toner 
Collecting Screw back toward to the Conveying Screw in the rear of the machine. 
It is then collected in the Waste Toner Collecting Box.3. The surface of the PC Drum after the image transfer process is irradiated with light 
from the Main Erase Lamp. This neutralizes any potential left on the surface of the 
PC Drum.
Figure 2-17.  Cleaning/Main Erase mechanism
4038T2C024AA
Drum Charge Corona Bias Y, M, CDrum Charge Corona Bias K
Developing Clutch/K (CL4)Color PC Drum Motor (M2) ONMain Motor (M1) ON
Color Developing Motor (M3)
4038T2C030AA
Cleaning Blade
Cleaning Blade Toner Collecting Screw 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 46
Confidential2.2.7  Developing section2.2.7.1  Composition
Figure 2-18.  Composition 1
Figure 2-19.  Composition 2
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4039T2C107AA
Doctor Blade
Developing Roller
Toner Supply Screw
Toner Conveying 
Screw
Developing Clutch/K (CL4)
Color PC Drum 
Motor (M2)
PC Drum/Y
Supply/Agitating/
Conveying Screws
Main Motor (M1)
PC Drum/K
Developing Roller
Color Developing 
Motor (M3) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 47
Confidential2.2.7.2  Drive
Figure 2-20.  Drive overview
2.2.7.3  OperationDEVELOPING DRIVE CONTROL
Figure 2-21.  Developing Drive control
Developing Clutch/K (CL4)
PC Drum/K Color PC Drum 
Motor (M2)
PC Drum/Y Color Developing 
Motor (M3)
Developing 
Roller
Supply/Agitating/
Conveying Screws
Toner Collecting Screw
Main Motor (M1)
4038T2C025AA
Main Motor (M1)
Color PC Drum Motor (M2)Drum Charge Corona Bias/Y, M, CDrum Charge Corona Bias/K Color Developing Motor (M3)
Developing Clutch/K (CL4)1st Image Transfer Pressure/
Retraction Clutch (CL3)
2nd Image Transfer Pressure/
Retraction Motor (M5)Developing Bias/K (DC)
Developing Bias/Y, M, C (DC) Developing Bias/K (AC)
Developing Bias/Y, M, C (AC) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 48
ConfidentialDEVELOPER FLOW1. Toner supplied from the rear end of the Developing Unit is fed to the lower screw. 
It is then fed to the front of the unit, while being mixed with developer and 
electrically charged by the Supply/Agitating/Conveying Screws.2. The TCR Sensor installed on the underside of the Developing Unit detects toner-to 
carrier ratio during this time.3. The developer, fed to the front of the Developing Unit, is conveyed further to the 
upper screw.4. The Toner sticks to the electrostatic latent image on the surface of the PC Drum. 
The developer that is left on the Sleeve is returned to the lower screw by the 
magnetic pole positioning of the Developing Roller. It is then conveyed to the rear 
side of the Photoconductor Unit.
Figure 2-22.  Developer flow (For PU/Y)
Supply/Agitating/Conveying 
Screws PC Drum/Y
Developing Roller
Toner Supplied from Hopper
Doctor Blade 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 49
ConfidentialDEVELOPING BIAS†
The developing bias voltage (Vdc) is applied to the Developing Roller so 
that an adequate amount of toner is attracted onto the surface of the PC 
Drum.
†
During development, Vdc of DC(-) + is applied so that Toner can be 
attracted PC Drum easily. This component of AC is applied only during 
development. Other than during development, only Vdc of DC(-) is 
applied.
†
The developing bias (Vdc) is supplied from High Voltage Unit (HV1).
Figure 2-23.  Developing bias
4038T2C035AA
Pressure PlateDeveloping Bias Terminal 
(Main Body Side)
Pressure Plate
Developing Roller
Developing Roller 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 50
ConfidentialDEVELOPMENT SYSTEMThe machine employs the two-component non-contact development system to 
achieve even finer reproduction.
Figure 2-24.  Development system
TCR SENSOR CONTROL†
The TCR Sensor detects toner-to-carrier ratio (T/C) of the developer. In the 
Mechanical Control Board, the amount of the toner supplied to the 
Developing Unit is determined by the detected ratio. Magnetic Sensor is 
mounted on the underside of the Developing Sections.
†
The magnetic permeability (powder density) of the carrier in the developer 
is measured to determine the T/C.
†
A polyester film is provided for the Conveying Screw portion to scrape 
toner off the surface of the TCR Sensor.
†
The TCR Sensor is integrated with the Photoconductor Unit. When the 
TCR Sensor is breakdown, the entire Photoconductor Unit must be 
replaced.
Figure 2-25.  TCR Sensor
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PC Drum Developing Roller
4038to503c0
4038T2C031AA
TCR Sensor Polyester 
filmMagnetic TCR Sensor