Epson C 2900 Manual
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![Page 598
6 - 41 Chapter 6 Principles of Operation
Epson AcuLaser C2900NRevision B
Confidential
MiS06027KA
MAGNET ROLL (K)DRIVE ASSY SUB
DRIVE ASSY PH Sub Motor
GEAR D2 GEAR D4
GEAR D3 IN
Cutting of drive
Drive from
Sub Motor GEAR D3 OUTCAM C
FLANGE D3
[ BLACK and WHITE MODE ]
COLOR MODE
SWITCHING SENSOR
COLOR MODE
SWITCHING SOLENOIDCAM C
GEAR C](http://img.usermanuals.tech/thumb/23/100561/w64_c-2900-manual-1509489781_d-597.png "Page 598
6 - 41 Chapter 6 Principles of Operation
Epson AcuLaser C2900NRevision B
Confidential
MiS06027KA
MAGNET ROLL (K)DRIVE ASSY SUB
DRIVE ASSY PH Sub Motor
GEAR D2 GEAR D4
GEAR D3 IN
Cutting of drive
Drive from
Sub Motor GEAR D3 OUTCAM C
FLANGE D3
[ BLACK and WHITE MODE ]
COLOR MODE
SWITCHING SENSOR
COLOR MODE
SWITCHING SOLENOIDCAM C
GEAR C")
6 - 44 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 3.9.2 Data Flow Print data (electric signal) from the printer controller flows as shown below until it is turned into a print. Wsb06042KA
6 - 45 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 3.10 Duplex 3.10.1 Major functions - CLUTCH ASSY EXIT Transmits the driving power from the DRIVE ASSY EXIT to Roll Assy Exit in the Fuser. When the clutch operates, the Roll Assy Exit rotates in the reverse direction. The clutch is stopped when the paper reached the Duplex. - DRIVE ASSY DUP (PL11.2.5) The DRIVE ASSY DUP supplies the driving power to the Lower Roll (ROLLER ASSY DUP) and Upper Roll (ROLL ASSY DUP1). (Refer to 6.5 DRIVE ASSY DUP) - DRIVE ASSY EXIT (PL11.2.2) The DRIVE ASSY EXIT supplies the driving power to the Roll Assy Exit in the Fuser Unit. (Refer to 6.5 DRIVE ASSY DUP) - PWBA DUP (PL11.1.16) The PWBA DUP controls motor and clutch. MiS06029KA CLUTCH ASSY EXIT ROLLER ASSY DUP (Lower Roll)ROLLER ASSY DUP (Upper Roll) PWBA DUP DRIVE ASSY DUPDRIVE ASSY EXIT
6 - 46 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 3.11 250 Paper Tray 3.11.1 Major functions 250 Paper Tray - GUIDE SIDE ASSY R (PL12.5.8) / GUIDE SIDE L (PL12.5.6) The GUIDE SIDE ASSY R and GUIDE SIDE L can move at a right angle to the paper transfer direc- tion to align the paper width. - END GUIDE The END GUIDE can move in the paper transfer direction to determine the paper size. - HOLDER ASSY RETARD (PL12.5) The HOLDER ASSY RETARD and the FEED ROLLER pinch the paper to prevent multiple sheet feed. - PLATE ASSY BOTTOM (PL12.5.2) PLATE ASSY BOTTOM is locked to the bottom side when paper tray is pulled out from the paper feeder and unlocked when paper tray is installed to the paper feeder. Pushes the paper against the feed roll using a spring tension. GUIDE SIDE LGUIDE SIDE ASSY R HOLDER ASSY RETARD (Retard Roller) END GUIDE PLATE ASSY BOTTOM MiS06044SA
6 - 47 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 3.11.2 Major functions (Paper Feeder) - SENSOR PHOTO (No Paper Sensor:PL12.4.13) Detects the presence/absence of paper in the paper tray based on the position of ACTUATOR NO PAPER (PL12.4.19). (No paper: Sensor beam is intercepted) - SOLENOID FEED MSI (PL12.2.15) Transmits the driving power from the MOTOR ASSY SUB (PL12.2.16) to ROLL ASSY FEED. (Refer to 6.6 MOTOR ASSY SUB) - ROLL ASSY FEED (PL12.4.4) When the SOLENOID FEED MSI operates, the ROLL ASSY FEED starts rotating and the ROLL ASSY FEED feeds the paper. (Refer to 6.6 MOTOR ASSY SUB) - SENSOR PHOTO (PAPER PATH SENSOR:PL12.4.13) It detects when the paper front end reaches the CHUTE ASSY TURN (PL12.4.1). ON: The paper activates the actuator. - CLUTCH ASSY DRV (PL12.2.6) Transmits the driving power from the MOTOR ASSY SUB (PL12.2.16) to ROLL ASSY REGI (PL12.4.9) and ROLL REGI METAL (PL12.4.10). - MOTOR ASSY SUB (PL12.2.16) The MOTOR ASSY SUB is driving the rolls of the option feeder. (Refer to 6.6 MOTOR ASSY SUB) - PWBA FEED H (PL12.2.1) The PWBA FEED H controls motor, sensor and clutch.
6 - 48 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential MiS06031KA SENSOR PHOTO (Tray2 No Paper Sensor) SENSOR PHOTO (Paper Path Sensor)TURN ROLL RUBBER (ROLL ASSY REGI) TURN ROLL METAL (ROLL REGI METAL) CLUTCH ASSY DRVROLL ASSY FEED SOLENOID FEED MSI MOTOR ASSY SUB PWBA FEED H
6 - 49 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 4. Operation Modes 4.1 Operation Modes For the operation of the printer, the following four modes are provided. - READY mode The printer is ready for printing. - PRINTING mode The printer is under printing. - Sleep mode (Energy star) The printer is under power saving. - Deep sleep mode The printer is under power saving.
6 - 50 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 5. Control 5.1 Control of Paper Size The printer doesn’t have switches for detecting paper size, and only length of paper is detected by the Regi Sensor when feeding paper. If printing data and paper size don’t match, error is sent to the ESS. 5.2 ROS Light Quantity Control The image data are entered to the laser diodes in the ROS as electric signals (data are expressed with high and low voltage values), and the laser diodes convert the image data from electric signals to opti- cal signals (data are expressed with blinking laser beams). Variations in light quantity of laser beams or variations in optical system (such as lenses) or drum sen- sitivity cannot attain a proper electrostatic image, therefore, the laser beam light quantity is monitored and controlled by the laser diodes. The ROS in this printer has four laser diodes for yellow, magenta, cyan, and black respectively, and the light quantity is automatically adjusted for each color.
6 - 51 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 5.3 Process Control For a stable printing, the parameters related to the image forming must be corrected as necessary. The control of the entire printing process including parameter correction control is called process control. Mainly, the process control is performed in the following two methods, both of which are performed after every 25 cumulative prints upon termination of a print run or during a continuous run.: • Potential control • Toner density control To supplement these two controls, the following controls are provided: • High Area Coverage Mode • Admix Mode 5.3.1 Potential Control To attain stable printing image density, the drum charging voltage, the developing DC voltage and the ROS light amount are adjusted according to the developing capability of each color carrier that varies momentarily. The adjusted drum charging voltage, the developing DC voltage and the ROS light amount are fed back to keep the printing image density constant. The outline of control is as follows. 1) The HUMIDITY SENSOR (temperature and humidity sensor) detects the temperature and humidity. 2) The patches of respective colors (yellow, magenta, cyan, and black) for the potential control are generated and transferred on the Belt. 3) The ADC Sensor (density sensor) detects the density of the patch on Belt. 4) The drum charging voltage, the developing DC voltage and the ROS light amount are adjusted for each color according to the detected patch density.
6 - 52 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 5.3.2 Toner Density Control The toner density must be kept constant to attain stable printing image. The control system for this pur- pose is called toner density control. 1) PCDC (Pixel Count Dispense Control) The quantity of the toner to be consumed in the developing process is calculated by counting the video signals entered to the ROS. The quantity of the toner to be consumed is calculated by the toner dispensing time. The toner motor is driven based on the calculated toner dispensing time when supplying the toner to the developer. 2) ADC (Auto Density Control) The patches of respective colors (yellow, magenta, cyan, and black) for the toner density control are generated under specified potential condition, and transferred on the Belt. The ADC Sensor mea- sures this density. The measured value is compared with the reference value. If the toner density is lower, the toner dispense quantity is increased at the next printing, or if the toner density is higher, the toner dispense quantity is reduced at the next printing. The toner dispense quantity is calculated by the toner dispense time. This calculation is made for each color. 5.3.3 High Area Coverage Mode A continuous printing of any image of area coverage exceeding extra toner dispense capability causes the toner density in the developer to be lowered. The High Area Coverage Mode postpones the next page feed and dispenses the toner during this time, if the toner dispense time reached the specified value during a continuous printing. 5.3.4 Admix Mode This mode prevents the toner density from being lowered, whenever the value of the toner density con- trol patch measured by the ADC Sensor falls far below the standard value, by performing extra toner dispensation. If the toner density level cannot be recovered even after this operation, it is judged that the toner has run out. 5.3.5 ADC Sensor Adjustment The ADC Sensor is a reflection type sensor that irradiates the light from its LED onto the target and detects the reflected light at its photoreceptor and outputs electric signals responsive to the amount of the detected light. To ensure an accurate patch density measurement, the surfaces of the ADC Sensor is cleaned to remove soil due to toner, etc., and the light amount adjustment is made so that the reflected light amount satisfies the prescribed value, when creating the patch for potential control and toner density control.
6 - 53 Chapter 6 Principles of Operation Epson AcuLaser C2900NRevision B Confidential 5.4 Color Registration Control The printer uses a tandem system where the drums and developers are arranged respectively for each of yellow, magenta, cyan, and black colors. Since the images are formed on the drum of each color to be overlaid one another, a color shift may occur. The color registration control calculates how much the registration is shifted, and adjusts the ROS write timing. The lateral registration control adjusts all of four colors in lateral directions. The color registration control is made from a change in inside temperature and the print count at the execution of the process control. The control is outlined below: 1) With no toner on the Belt, the output value of ADC Sensor is measured to determine the thresh- old value. 2) The patches for color registration control are generated on the Belt. These patches are com- posed of 10mm lines of K, C, K, M, K, and Y in this order. 3) The density of patches generated by the ADC Sensor is read. 4) The shift correction amount is calculated from the threshold value determined in 1) and the patch density measured in 3). 5) The ROS write timing is changed according to the shift correction amount.