Pump Epson Repair

2.2.3.2 Paper Feed Mechanism

The major components of the paper feed mechanism are the PF motor, PF roller, EJ (paper eject) roller, PE sensor, PF encoder sensor, and PF scale. The sheet of paper fed from the ASF unit is nipped between two rollers to be transported during printing and to be ejected.

1. The first two rollers used for feeding the paper are the PF roller and the paper guide roller mounted on the upper paper guide unit. The PF motor drive force is transmitted to the paper guide roller via the PF roller.

The figure below shows how the PF motor pinion gear drive force is transmitted to the PF roller, EJ roller, paper guide roller and the star wheel roller.

When the PF motor pinion gear starts counterclockwise rotation (as seen from the left side), the sheet of paper fed from the ASF unit to the PF roller is transported and ejected from the printer by the PF roller/paper guide roller combination and the EJ roller/star wheel roller combination.

2. The next two rollers are the EJ roller and the star wheel roller mounted on the Star Wheel Holder Assy. The PF motor drive force is transmitted to the star wheel roller via the EJ roller.

Backup Eprom Cx4300Epson Stylus Paper Feed Motor Encoder

PF Motor Drive Transmission Path (as seen from the left side of the printer)

• PF motor pinion gear (CCW) ^ Spur gear A (PF roller) (CW) ^ Transmission gear (CCW) ^ Spur gear B (EJ roller) (CW)

Figure 2-13. Paper Feed Mechanism

2.2.4 Ink System Mechanism

2.2.4.1 Capping Mechanism

The ink system mechanism includes the capping mechanism and the pump mechanism. And the capping mechanism includes the carriage lock mechanism and the wiping mechanism. The table below describes the function of each mechanism.

Table 2-4. Function of Each Mechanism in Ink System

Mechanism

Function

Capping mechanism

Covers the printhead with the cap to prevent ink evaporation when the printer is in standby mode or when the printer is off.

Wiping mechanism

Wipes dust or ink stain off the printhead nozzle surface.

Pump mechanism

Drains ink from the ink cartridges, ink cavity, and the cap and sends it to the waste ink pad.

Carriage lock mechanism

Locks the carriage unit with the carriage lock lever while the unit is in the home position.

Waste Ink Tube (toward the Waste Ink Pad)

Cap Slider

Pump Unit

Waste Ink Tube (toward the Waste Ink Pad)

Cap Slider

Pump Unit

Backup Eprom Cx4300

Wiper

Combination Gear + Cam (with clutch)

Carriage Lock Lever

Figure 2-14. Ink System Mechanism

Wiper

Combination Gear + Cam (with clutch)

Carriage Lock Lever

Figure 2-14. Ink System Mechanism

The capping mechanism incorporates the wiping mechanism, however, the two mechanisms operate independently. Capping the printhead is performed by the carriage movement as the previous model does.

Epson Position Modul

Ink System (Cap unit)

Carriage unit moves toward the home position

Carriage Unit presses down cap slider. This causes cap to pop up and cover printhead.

Figure 2-15. Capping Mechanism 2.2.4.2 Carriage Lock Mechanism

Ink System (Cap unit)

Carriage unit moves toward the home position

Carriage Unit presses down cap slider. This causes cap to pop up and cover printhead.

Figure 2-15. Capping Mechanism 2.2.4.2 Carriage Lock Mechanism

The carriage lock mechanism is activated by the capping operation. Locking or unlocking the carriage is performed by the PF motor drive force that is transmitted via the cam of the clutch-equipped combination gear. (See "Wiping Mechanism (p51)" for more explanation about the cap slider and the cam operations)

Locking Carriage Epson

Cam moves to lock or unlock carriage only when cap slider pops up.

Figure 2-16. Carriage Lock Mechanism

Cam moves to lock or unlock carriage only when cap slider pops up.

Figure 2-16. Carriage Lock Mechanism

2.2.4.3 Wiping Mechanism

The wiping mechanism is activated by the capping operation. The mechanism moves the wiper into- and out-of position for cleaning the head using the PF motor drive force that is transmitted via the cam of the clutch-equipped combination gear.

Non cleaning state (clutch disengaged)

Groove of Wiper protrusion cam (1)

Cap Slider

Groove of Wiper protrusion cam (1)

Cap Slider

9400 Wiper Motor

^__Cap Slider protrusion ^

Clutch-equipped combination gear

^__Cap Slider protrusion ^

Clutch-equipped combination gear

In the non-cleaning state, the cap slider protrusion secures the cam and the clutch of the combination gear is disengaged. Therefore, the PF motor drive force is not transmitted to the cam.

Cleaning state (clutch engaged)

/Groove of Wiper protrusion^ cam (1)

/Groove of Wiper protrusion^ cam (1)

Epson Stylus 9300

Groove of cam (2)

Cap Slider protrusion

Groove of cam (2)

Cap Slider protrusion

When the cap slider pops up, its protrusion is disengaged from the groove of cam (2). Therefore, the clutch is engaged causing the cam to rotate together with the combination gear.

PF motor CW rotation: Moves the Wiper Upward

PF motor CCW rotation: Moves the Wiper Downward

9400 Wiper Motor

The clockwise rotation of the PF motor rotates the cam in clockwise direction to move the wiper upward to clean the head.

The counterclockwise rotation of the PF motor rotates the cam in counterclockwise direction to move the wiper downward, which is out-of position for cleaning.

The clockwise rotation of the PF motor rotates the cam in clockwise direction to move the wiper upward to clean the head.

The counterclockwise rotation of the PF motor rotates the cam in counterclockwise direction to move the wiper downward, which is out-of position for cleaning.

Groove (2) of the cam is designed so that the cap slider protrusion cannot be set into the groove unless the wiper is moved downward. This prevents the slider protrusion from being engaged with the groove when the slider is moved downward without the wiper moved downward.

Figure 2-17. Wiping Mechanism

2.2.4.4 Pump Unit Mechanism

The PF motor drives the pump unit mechanism as well as the paper loading/feed mechanisms. The motor drive force is always transmitted to the pump unit. (It is also transmitted to the LD roller via the clutch mechanism and the change lever.)

The rotational direction of the PF motor changes the pump unit operations as shown in the following table.

Table 2-5. PF Motor Rotational Direction & Pump Unit Operation

Rotational Direction*

Function

Clockwise

• Releases the pump

Counterclockwise

• Draws (suctions) ink

Note " * " : The rotational direction as seen from the right side of the printer.

□ Ink drawing operation

The pump unit draws ink out of the ink cartridges and ink cavity, and sends it to the waste ink pad by means of a pressure to the ink tube applied by the pump unit roller.

The following figure illustrates an overview of the pump unit mechanism operation.

Figure 2-18. Pump Mechanism

Note : The PF motor rotational direction is as seen from the right side of the printer.

Figure 2-18. Pump Mechanism

PF Scale

PF Encoder Sensor

PF Scale

PF Encoder Sensor

Epson Printer Roller Direction
Spur Gear A Transmission Spur Gear B (PF Roller) Gear (EJ Roller)
Backup Eprom Cx4300

Pump Unit

Cap Unit

Combination Gear B (Pump Unit Roller)

Figure 2-19. PF Motor Drive Transmission to Pump Unit

Pump Unit

Cap Unit

Combination Gear B (Pump Unit Roller)

Figure 2-19. PF Motor Drive Transmission to Pump Unit

2.2.5 Ink Sequence

□ Initial ink charge

When the printer power is turned On first time after purchase, the initial ink charge is automatically carried out to fill the ink cavity in the printhead with ink. The initial ink charge flag in the EEPROM is cleared when the initial charge is completed successfully. Stylus CX9300F/CX9400Fax/DX9400F require about 120 seconds at maximum for the initial ink charge. If the power is turned Off during the process, the printer automatically runs a CL3 at the next power-on.

□ Manual Cleaning

Stylus CX9300F/CX9400Fax/DX9400F offer three types of manual head cleaning (CL1, CL2, and CL3) that can be run from the control panel. They delete air bubbles in ink, clear nozzle clogging, or to eject foreign materials.

CL1, CL2, and CL3 are performed in that order when the cumulative print time has not reached 9 minutes regardless of the number of print paths counted since the last CL. When 9 minutes has reached or exceeded, only CL1 is executed. In the case that any of the ink cartridges has almost run out or completely run out of ink, the LED flashes or light and the manual cleaning is disabled.

□ Timer Cleaning

Like the previous printers, this printer dose not have lithium battery which is used for the backup power source for Timer IC. So, this printer manages the printer off period or cleaning cycle by using the following method.

The printer driver sends the timer command (time data) to the printer before printing. The command is generated based on the PC's timer and it consists of year, month, date, hour, minute and second. As soon as the printer receives the timer command, the printer stores the command in the EEPROM and compares it with the latest CL time which has been stored in the EEPROM. When the time difference exceeds the predetermined time period, the printer automatically runs the timer cleaning and stores the date and time of the cleaning in the EEPROM.

The following two types of flushing is carried out automatically.

■ Pre-printing flushing

Reduces viscosity of ink inside the nozzles before starting printing.

■ Periodic flushing

Reduces viscosity of ink inside the nozzles during printing.

2.3 Scanner Mechanism

The major components of the scanner mechanism of Stylus CX9300F/CX9400Fax/

DX9400F are the scanner carriage unit and the scanner motor.

However, the scan bed is divided into two parts including ADF reading section.

2.3.1 Scanner Carriage Mechanism 2.3.1.1 Scanner Carriage Unit Overview

The Scanner Carriage Unit is constructed of a CIS Board (including linear CCD), Rod

Lens Array, LED (light source), etc.

CIS Board contains the sensing elements that are placed across the entire width of an original. The sensing elements, which does not install a color filter, read an original through the Rod Lens Array by turning on red, green, and blue light-emitting diodes (LEDs) alternately. It is not the CIS Board but the Main Board that converts the analog light signal read by the Rod Lens Array into digital signal.

A number of rod-shaped lenses, which are arranged on the sensing elements, are also placed across the entire width of an original. These lenses read the light reflected from the original that is produced by the light source (LEDs) and pass the information to the sensing elements. Compared to conventional CCD method, this optical system allows the focal length (distance between sensor and image scanned) to be shallow. Therefore, an original to be scanned should be brought close to the document glass. The optical system, in addition, is 1:1, (there is no optical reduction or enlargement) and this results in a scanner offering the solid performance in terms of accuracy.

Three color LEDs (the three colors being red, green, and blue) illuminate the line to be scanned in the document. Unlike cold cathode fluorescent lamp used in CCD method, using LEDs requires no warm-up time and allows the CIS to be highly power efficient.

Lower Housing Guide Rail Scanner Carriage Unit
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