Epson Stylus CX7300 Service Manual page 54

EPSON Stylus CX7300/CX7400/DX7400/NX200/TX200 series/SX200 series/Stylus CX8300/CX8400/DX8400/NX400/TX400 series/SX400 series Revision C
2.1.6.4 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*
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.
Cap unit side
Note : The PF motor rotational direction is as seen from the right side of the printer.
Figure 2-18. Pump Mechanism
OPERATING PRINCIPLES
Function
Waste Ink Pad
side
Overview
PF Encoder Sensor
PF Scale
PF Motor
Pinion Gear
Spur Gear A
Transmission
(PF Roller)
Gear
Spur Gear C
(PF Roller)
Combination Gear A
Figure 2-19. PF Motor Drive Transmission to Pump Unit
Spur Gear B
(EJ Roller)
Pump Unit
Cap Unit
Combination Gear B
(Pump Unit Roller)
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Confidential