Epson Aculaser M 2000 Service Manual

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 61
ConfidentialAUTO TRANSFER VOLTAGE CONTROLTo optimize image transfer output, the machine is provided with auto transfer 
voltage control. The control lets a constant current flow through each of the 
Image Transfer Rollers. Then, from the voltage detected, the resistances of the 
1st Image Transfer Roller, 2nd Transfer Roller, and Transfer Belt are 
measured. The optimum image transfer output voltages applied to the 1st and 
2nd Transfer Rollers during printing are thereby automatically adjusted.
 
The 1st and 2nd image transfer auto transfer voltage control operations are 
carried out immediately before the execution of image stabilization control.TRANSFER BELT CLEANINGThe Cleaning blade is mounted on the Transfer Belt in order to remove the 
remaining toner at the Transfer Belt.
 
The Cleaning blade is always pressed to the Transfer Belt by the Fixed blade 
system.
Figure 2-40.  Transfer Belt cleaning
REVERSING CONTROL OF THE TRANSFER BELTPaper dust or toner between the Transfer Belt and the edge of the Cleaning 
blade will be removed by slightly rotating the Transfer Belt backward and then 
rotating it forward again.
„
The Cleaning will be executed at the end of each print job sequence.
„
Cleaning will be performed when the power is turned ON, the door is 
opened or closed, or the deep sleep mode (heater off mode) is released.
„
Cleaning will be performed when Image stabilization is finished.
4038T2C164AA
Driven Roller Toner Collecting Screw
Cleaning BladeTransfer Belt 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 62
Confidential2ND TRANSFER ROLLER CLEANING†
In order to remove the remaining toner on the 2nd Transfer Roller, DC 
charge is applied to transfer the remaining toner on the 2nd Transfer Roller 
to the Transfer Belt.
†
The Cleaning Blade then scrapes off the toner on the surface of the 
Transfer Belt.
Figure 2-41.  2nd Transfer Roller cleaning
†
Operation timing„
When the image stabilization control is performed.
„
When the printer is recovered from the JAM error.
CHARGE NEUTRALIZATION AND SEPARATION OF PAPER†
In order to remove the residual potential on the paper with the 2nd Image 
transferred, the neutralization material is applied to the guide plate without 
contact after the 2nd Transfer Roller.
†
In order to separate the paper from the Transfer Belt without fail after the 
2nd Image Transfer, a Transfer Belt Separation Claw is mounted (one point.)
Figure 2-42.  Charge Neutralization and Separation of Paper
DETECTION OF NEW TRANSFER BELT UNIT†
When Transfer Belt Unit is replaced with new one, the new unit detection 
is made by engine side and Life counter value is reset automatically.
†
The new unit detection is made when the Power Switch is turned ON and 
the Right Door is opened and closed.
Figure 2-43.  Timing for New Unit Detection/Operation
4038T2C161AAHV1
-
-
-
-
-
-
---
-
+
Transfer Belt 2nd Transfer Roller
Cleaning Blade
4038T2C173AA
Transfer Belt
2nd Transfer RollerCharge Neutralizing Cloth
Separation Claw
Transfer Auto Transfer Voltage 
Control Adjustment
Image Stabilization
Power OFF/ON, Right door Open/
Close
Check Transfer Belt Unit being 
mounted
Check detection of the new unit  
(24V energizing)
Perform the initial operation for 
Transfer Belt 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 63
Confidential2.2.10  Toner Collecting section2.2.10.1  Composition
Figure 2-44.  Composition
4038T2C110AA
4039T2C11AA
4038T2C023DA
PU Toner Collecting Screw
Transfer Belt Toner Collecting Screw
Waste Toner Collector4038T2C024DA
Waste Toner Full Sensor (PC8)
Waste Toner Conveyance ScrewWaste Toner Collector 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 64
Confidential2.2.10.2  Drive
Figure 2-45.  Drive overview
2.2.10.3  OperationTONER COLLECTING MECHANISMToner collected by the Cleaning Blade of the Transfer Belt and waste toner in 
each of the Photoconductor Units are conveyed by the corresponding Toner 
Collecting Screws to the Waste Toner Collector.
Figure 2-46.  Toner collecting mechanism
WASTE TONER COLLECTOR SET DETECTION†
The Waste Toner Full Detection Signal on the Water Toner Full Sensor 
(PC8) detects Set/Unset of the Waste Toner Collector.
†
Set/Unset of the Waste Toner Collector is detected when the front door is 
closed with the Main Power Switch being ON. The printing will stop when 
the Waste Toner Collector is not set.
4038T2C025DA
Main Motor (M1)
PU Toner Collecting Screw
Cleaning Blade
Transfer Belt Toner 
Collecting Screw
4038T2C023DA
Transfer Belt Toner 
Collecting ScrewPU Toner Collecting Screw
Waste Toner Collector 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 65
ConfidentialWASTE TONER NEAR-FULL/FULL DETECTION CONTROL†
Waste Toner Detection Mechanism„
To prevent false detection, an Agitation Screw is mounted in the Waste 
Toner Collector so that the waste toner is accumulated in the bottle 
evenly.
„
The Waste Toner Full Sensor (PC8) detects the area where the visor A 
mounted on the shaft of the Toner Conveying Screw overlaps with the 
visor B. (As the amount of the waste toner increases, the load for the 
screw to rotate will increase. The period of time the Light Shield Plate 
blocks the Waste Toner Full Sensor (PC8) will then become shorter).
Figure 2-47.  Waste Toner Detection Mechanism 1
Figure 2-48.  Waste Toner Detection Mechanism 2
4038T2C175AA
4038T2C174AA
Waste Toner Collector Agitator ScrewLight Shield Plate A
Light Shield Plate B
Waste Toner Full Sensor (PC8)
Torsion Coil Spring
4038T2C176AA
Light Shield Plate A
Light Shield Plate B
Waste Toner Full Sensor (PC8)
4038T2C178AA
4038T2C177AA
Waste Toner EmptyWaste Toner Full
4038T2C116AA 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 66
Confidential2.2.11  Paper feed section (Standard Cassette)2.2.11.1  Composition
Figure 2-49.  Paper feed section (MP tray)
4038T2C111AA4038T2C172AA
Standard cassette 
Separation Roller Standard cassette Feed Roller Registration Roller Sensor (PC1)
4039T2C113AA
4038T2C026DB
Std. cassette Separation Roller Std. cassette Feed Roller  Std. cassette Paper Empty Sensor (PC10) Std. cassette Paper Feed Clutch (CL2) Std. cassette Device 
Detection Sensor (PC12)
Std. cassette Paper Near-Empty Sensor 
(PC11)
Std. cassette Paper Size 
Board (PWB-I)Std. cassette CD Paper Size Sensor 
(PC9) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 67
Confidential2.2.11.2  Drive
Figure 2-50.  Drive overview
2.2.11.3  OperationPAPER TAKE-UP CONTROL
PAPER NEAR-EMPTY/PAPER EMPTY DETECTION†
When the Standard cassette Paper Near-empty Sensor is blocked, a 
corresponding warning display is given on the control panel.
†
The Standard cassette Paper Empty Sensor detects a paper empty 
condition.
Figure 2-51.  Paper Near-Empty/Paper Empty detection
4038T2C027DAStd. cassette Feed Roller
Std. cassette Paper Feed Clutch (CL2) Main Motor (M1)
4038T2C138AA
Main Motor (M1)
Paper Feed Clutch (CL2)
Registration Roller Clutch (CL1)
Registration Roller Sensor (PC1)Start Key ON Registration Roller ON
4036ma2116c0
4036ma2038c1
Std. cassette Paper Empty Sensor 
(PC10) Std. cassette Paper Near-empty Sensor 
(PC11)
An Empty Condition A Near-empty Condition 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 68
ConfidentialPAPER SIZE DETECTION CONTROL†
Paper width/length are detected to determine the paper size from their 
combination.
Note * : This combination will also be used due to the sensors ability.
H : BlockingL : Unblocking
Figure 2-52.  Paper size detection control
PAPER INTERVAL CONTROLIt sets the proper interval between papers (pitch) according to the paper size 
and mode for multiple printing.†
Basic Paper Interval Control
s
Figure 2-53.  Paper Interval Control
Table 2-1.  Paper size detection control (Standard Cassette)
Paper Size
Paper Size Board (PWB-I)
CD Paper Size Sensor (PC9)
1
2
3
4
A6R
ON
OFF
ON
OFF
H
A5
ON
OFF
ON
OFF
L
B6R
OFF
ON
OFF
ON
H
B5
OFF
ON
OFF
ON
L
A5R
OFF
OFF
ON
OFF
H
A4
OFF
OFF
ON
OFF
L
B5R
ON
ON
OFF
OFF
H
B5R
*
OFF
ON
OFF
OFF
H
OFF
ON
ON
OFF
H
ON
ON
ON
OFF
H
A4R
OFF
OFF
OFF
ON
L
A4R
*
OFF
OFF
OFF
OFF
L
B4
ON
ON
ON
OFF
L
A3
ON
ON
ON
ON
L
A3 Wide
OFF
ON
ON
ON
L
4036ma2042c1
1 2
3 4
GuidePaper Size Board (PWB-I)4038T2C194AA
Space 
between 
papers
Paper interval Paper feed direction 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 69
Confidential2.2.12  Bypass section (MP tray)2.2.12.1  Composition
Figure 2-54.  Composition
4038T2C112AA4039T2C114AA
MP tray Paper Empty Sensor (PC13)
Paper Side Plate
Paper Side Plate
4038T2C181AA
MP tray Feed Roller 
(Bypass)
MP tray Paper Empty Sensor (PC13) Paper Lifting Plate
MP tray Separation Roller 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 70
Confidential2.2.12.2  Drive
Figure 2-55.  Drive overview
2.2.12.3  OperationPAPER TAKE-UP CONTROLPAPER EMPTY DETECTIONThe MP tray Paper Empty Sensor (PC13) detects a paper empty condition in 
the Bypass Section.
Figure 2-56.  Paper Empty detection
4038T2C113AA
4039T2C116AA
MP tray Lift-up Sensor (PC14)MP tray Paper Feed Clutch (CL5)
MP tray Paper Pick-up Solenoid (SL2)
MP tray Feed Roller (Bypass)
Main Motor (M1)MP tray Lift-up Sensor (PC14)
MP tray Paper Pick-up Solenoid (SL2)
Paper Lifting Cam
MP tray Paper Feed Clutch (CL5)
4038T2C142AA
Main Motor (M1)
MP tray Paper Pick-up Solenoid (SL2)
MP tray Lift-up Sensor (PC14)
MP tray Paper Feed Clutch (CL5)Start Key ON Move to Standby Position
4038T2C182AA
4038T2C114A
A
MP tray Paper Empty Sensor (PC13)
When there is no paper
When the paper is fully supplied