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...

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...

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...

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...

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
4038to503c0
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...

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...

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...

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...