Epson Aculaser M 2000 Service Manual

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 71
ConfidentialPAPER LIFTING MOTION CONTROL†
It turns the MP tray Pick-Up Solenoid (SL2) ON when the MP tray paper 
feed is started. The Lifting Cam will rotate to move the Paper Lifting plate 
up to the feeding position.
†
When the printing is finished, the MP tray Pick-Up Solenoid (SL2) will be 
ON again. The Paper Lifting Cam will then rotate to move the Paper 
Lifting plate down to the waiting position.
†
The Paper Lifting plate will stay at the feeding position while the job is 
being executed. It will move down to the waiting position when the job is 
finished and no following printing is demanded.
†
If a paper misfeed occurs, the Paper Lifting Plate is lowered to its standby 
position during pre-drive performed after the misfed sheet of paper has 
been cleared and the door has been closed.
†
The position of the Paper Lifting Plate is detected by the detection plate 
which is mounted coaxially with the Paper Lifting Plate, and also by the 
MP tray Lift-Up Sensor (PC14).
†
Operation timing
Figure 2-57.  MP tray paper lifting motion control
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
4038T2C183AA
4038T2C113AA
MP tray Lift-up Sensor (PC14) MP tray Feed Roller (Bypass)
MP tray Paper Pick-up Solenoid (SL2)MP tray Paper Feed Clutch (CL5)
Registration Roller
Registration Roller Clutch (CL1)
OHP Sensor (PC4) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 72
Confidential2.2.13  Registration Roller section2.2.13.1  Composition
Figure 2-58.  Composition
2.2.13.2  Drive
Figure 2-59.  Drive overview
2.2.13.3  OperationREGISTRATION ROLLER CONTROLThe followings are controlled.†
The paper will create a loop between the Feed Roller and the Registration 
Roller when the paper is being conveyed in order to correct the skew.
†
The Registration Roller Clutch (CL1) is controlled in order to synchronize 
the timing the unit starts writing the image and conveying paper.
Figure 2-60.  Registration Roller control
4039T2C118AA
4038T2C118AA
Registration Roller
OHP Sensor (PC4) Registration Roller 
Clutch (CL1)
4038T2C031DA
Registration Roller
Registration Roller 
Clutch (CL1)
4038T2C185AA
Registration Roller
Feed Roller
Paper
4038T2C186AA
Loop OHP Sensor (PC4)
Feed Roller Registration Roller 
Sensor (PC1) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 73
ConfidentialOHP DETECTIONOHP Sensor (PC4) checks to prevent printing on the paper other than OHP.
 
OHP detection will be performed before paper made the loop at the 
Registration Roller. When the OHP detection shows the different result from 
the setting on the operation panel, printing will stop to display Media Error.
Figure 2-61.  OHP detection 2
DECELERATION CONTROLIt controls the timing the paper reaches to the Registration Roller Sensor (PC1).
 
The Vertical Transport Motor (Vertical Transport Roller) for each tray will 
slow down its operation in order to adjust the speed of the paper being 
conveyed.
Figure 2-62.  Deceleration Control
Table 2-2.  OHP detection
Paper type set from 
control panel
Results of OHP 
Sensor (PC4) 
Detection
Operation
OHP
Other than OHP
Determines that there is mismatch of paper type, 
bringing all mechanisms to an immediate stop. Media Error will be displayed on the panel.
Other than OHP
OHP
4038T2C185AA
OHP Sensor (PC4)
4038T2C190AA
Registration Roller Sensor (PC1)
Optional Cassette Vertical Transport RollerOptional Cassette Vertical Transport Roller 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 74
Confidential2.2.14  Fusing section2.2.14.1  Composition
Figure 2-63.  Composition 1
Figure 2-64.  Composition 2
4038T2C119AA
4039T2C119AA
4038T2C191AA
Fusing Pressure Roller  
Heater Lamp (H3) Pressure 
Roller Heating Roller Thermistor/1 (TH1)
Heating Roller Thermistor/2 (TH3)
Heating Roller 
Thermostat (TS1)
Heating Roller Heater Lamp/1 (H1) Heating Roller Heater Lamp/2 (H2)Heating 
Roller
Fusing Pressure Roller 
Thermostat (TS2)Fusing Pressure Roller  
Thermistor /1 (TH2)
Heating Roller 
Thermistor/3 (TH4)
Fusing Pressure Roller  
Thermistor /2 (TH5)
4038T2C155AA4038T2C153AA
4038T2C154AA
Heating Roller Thermostat (TS1)
Fusing Pressure Roller Thermostat (TS2)
Heating Roller Thermistor/1 (TH1)
Heating Roller Thermistor/2 (TH3)
Fusing Pressure Roller 
Thermistor /1 (TH2)
Heating Roller Thermistor/3 (TH4)
Fusing Pressure Roller 
Thermistor /1 (TH2) 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 75
Confidential2.2.14.2  Drive
Figure 2-65.  Drive overview
2.2.14.3  OperationFUSING ROLLER DRIVE CONTROL†
Fusing Roller Speed Change Control„
The Fusing Roller (Heating Roller/Fusing Pressure Roller) is driven by 
the Fusing Motor (M4). The Fusing Motor (M4) drives the Heating 
Roller. The Fusing Pressure Roller rotates along with the Heating 
Roller.
„
In order to avoid fusing error, the rotation speed of the Fusing Roller is 
to be set to one of 2 levels according to the paper type or the print mode.
†
Fusing Loop Control
 
By creating a paper loop, the speed difference between the fusing and 
paper conveyance at 2nd transfer part will be adjusted. It prevents the 
double transferred image or brush effect.
Figure 2-66.  Fusing Loop Control
Table 2-3.  Rotation speed of the Fusing Roller
Paper Type/Print Mode
Fusing Speed
Plain paper/Monochrome
Normal speed
Plain paper/Color
Normal speed
Thick paper
Low speed
OHP transparencies
Low speed
4038T2C034DA
Fusing Pressure Roller Fusing Drive Motor (M4)
Heating Roller
4038T2C195AAFusing Loop Detect Sensor (PC3)
ON
OFF 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 76
ConfidentialHEATER LAMP CONSTRUCTIONThree heater lamps are controlled to be turned ON/OFF so the temperature of 
the Heating Roller and the Fusing Pressure Roller will stay appropriate to 
completely fuse the image.†
Heater Lamp Construction
 
The Heating Roller has two heaters with different heat quantities and light 
distributions.
†
Pressure Heater Lamp Construction
 
The Pressure Roller has the Pressure Roller Heater Lamp (H2) to heat up.
THERMISTOR CONSTRUCTIONThe Fusing Roller (Heating/Fusing Pressure) has five Thermistors. (Three on 
the Heating Roller, two on the Fusing Pressure Roller.)
†
Heating Roller Thermistor
Figure 2-67.  Heating Roller Thermistor
†
Fusing Pressure Roller Thermistor
Figure 2-68.  Fusing Pressure Thermistor
Table 2-4.  Heater Lamp Construction
Name
Symbol
Light 
emission
Function
Heating Roller Heater Lamp/1 H1 Long
Light will emit to heat to the edge of the 
roller
Heating Roller Heater Lamp/2 H3 Short
Light will emit to heat only the center of 
the roller
Table 2-5.  Heating Roller Thermistor Construction
Name
Symbol
Function
Heating Roller Thermistor/1 TH1
The main thermistor which detects the temperature at 
the center of the Heating Roller
Heating Roller Thermistor/2 TH3
The sub-thermistor which detects the temperature at the 
edge of the Heating Roller
Heating Roller Thermistor/3 TH4
The protection thermistor which detects the abnormally 
high temperature of the Heating Roller
Table 2-6.  Pressure Roller Thermistor Construction
Name
Symbol
Function
Fusing Pressure Roller 
Thermistor/1TH2
The main thermistor which detects the temperature at 
the center of the Fusing Pressure Roller
Fusing Pressure Roller 
Thermistor/2TH5
The protection thermistor which detects the abnormally 
high temperature of the Fusing Pressure Roller
4038T2C156AA
4038T2C158AA
TH1 TH3 TH4
Heating Roller
4038T2C157AA
4038T2C159AA
TH2TH5 Fusing Pressure Roller 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 77
ConfidentialTHERMOSTAT CONSTRUCTIONThe Fusing Drive Roller has two thermostats. (One on the Heating Roller and one on 
the Fusing Pressure Roller)
 
When the temperature of the Fusing Roller increases abnormally high, the 
Thermostat will detect it and shut down the power supplied to the heater lamp. This 
controls the High Temperature Protection/Thermostat Protection.FUSING ROLLER PRESSURE/RETRACTION MECHANISM†
The Pressure Roller is always pressed to the Heating Roller (Normal 
position).
†
By switching the Release lever, the pressure of the Fusing Pressure Roller can 
be switched between Envelope position/Paper jam countermeasure position.„
Envelope position
• By switching the Release lever to the lower direction shown below, the 
pressure of the Fusing Pressure Roller will be Envelope position.• Envelope position is for preventing the wrinkle when feeding Envelopes.• To switch from Envelope position to the normal position, move up the 
Release lever to the normal position.
Figure 2-69.  Envelope position
„
Paper jam countermeasure position
• By switching the Release lever to the position Fusing Pressure Roller will 
retract from the Heating Roller as shown below.• Paper jam release mechanism is equipped for removing the stuck paper.
Figure 2-70.  Paper jam countermeasure position 1
4038T2C199AA
4038T2C200AA
Normal position 
(Normal pressure)Envelope position 
(Low pressure)
Release lever
Leaving the printer for 30 days or more with the Release lever 
placed in the normal position will deform the pressing part of 
Fusing Roller. Deformed Roller may cause Uneven Gross 
or other image troubles when printing images with high 
density (high duty image) such as photographs.
 
Therefore, be sure to switch the Release lever to the 
Envelope position when leaving the printer for a long 
period of time.
4038T2C199AA
4038T2C201AA
Normal position 
(Normal pressure)Paper jam release 
position (No pressure)
Release lever 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 78
Confidential
• Close the Fusing cover when switching the position from Paper jam release to 
the normal. Closing the Fusing cover will return the Release lever to the 
normal position.
Figure 2-71.  Paper jam countermeasure position 2
FUSING ROLLER SMALL AMOUNT ROTATION CONTROLLeaving the printer in the low-power mode for a long period of time may 
deform the pressing part of the Fusing Roller due to the heat and pressure 
(Deformed Roller may cause Uneven Gross or other image troubles when 
printing the high duty image).
 
To prevent such Deformed Roller, rotate the Fusing Roller slightly and change 
the pressing part of the roller when a standby state in the low-power mode lasts 
for fixed time.
The Release lever must be closed by closing the Fusing cover.
4038T2C202AA
Release lever
Fusing Cover
4038T2C203AA
Pressing position 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 79
ConfidentialPAPER WINDING DETECTION CONTROLWith the roller fusing type Fusing Unit, paper jam may cause the paper to wind 
itself to the Fusing Roller. This Winding Detection control monitors the paper 
to detect when it winds itself to the roller lightly so that it can be removed 
easily.
 
Operations are explained below. †
It detects the winding before the roller is completely covered. (The length 
of the paper wound to the roller is shorter than the circumference of the 
roller.) The back-edge of the paper is sticking out from under the Fusing 
Unit and can be removed.
†
 When the paper jam occurs, rotating the Fusing Motor (M4) will make the 
paper stuck to the Fusing Roller even worse, so the unit will stop 
immediately.
Figure 2-72.  Paper Winding Detection Control
4038T2C196AA
Paper 
						

							EPSON AcuLaser C9200NRevision D
OPERATING PRINCIPLES      Operating Principle of Main Unit Mechanism 80
ConfidentialFUSING TEMPERATURE CONTROLWhen with Plain paper, A4 paper (horizontal), single-side 5 sheets, or when 
above the specified temperature inside the printer with the Main Power Switch 
turned ON
TEMPERATURE CONTROL IN THE LOW-POWER MODEIt adjusts the temperature by turning the controlled temperature down to reduce 
the power consumption in standby.PROTECTING FROM THE ABNORMALLY HIGH TEMPERATURE The machine provides protection against abnormally high temperature of the 
Fusing Unit in the following three steps.DETECTION OF A NEW FUSING UNIT†
When the new Fusing Unit is replaced, the new one is detected in the 
engine side and the life counter value is automatically reset.
†
The new Fusing Unit will be detected when the door is closed and the Main 
Power Switch is turned ON.
Table 2-7.  Fusing Temperature Control
No.
Status
[1]
Warming-up the unit
 
(Above the specified temperature when the Power is turned ON)Warming-up
 
(Below the specified temperature when the Power is turned ON)
[2]
In standby state
[3]
Printing
[4]
In standby state
[5]
Low-power mode
4038T2C144AA
[2] [1] [3] [4] [5]
*110 sec.  200
0
Power Switch ON Start Key ONWarm-up Completed
Printing 
complete
Standby modeNote * : When turning the Sub Power ON from the stable condition of Main Power ON/
Sub Power OFF with rated voltage.
Table 2-8.  Control target temperatureName
Symbol
Control target 
temperature
Heating Roller Thermistor/1
TH1
140 °C
Fusing Pressure Roller Thermistor/1
TH2
140 °C
Table 2-9.  Protection against abnormally high temperature
Step
Name
Control target temperature
Step 1 Software ProtectionThis protection operates when abnormally high 
temperature is detected.
Step 2 Hardware ProtectionMove to the protection in step 2 when the protection 
in step 1 is not executed.
Step 3 Thermostat ProtectionMove to the protection in step 3 when the protection 
in step 2 is not executed