Epson Stylus Color 640 Service Manual page 52

EPSON Stylus Color 440/640/740
2.1.1.5 Ink System
Ink system mechanism consists of 1)cap mechanism, 2)pump
mechanism, carriage lock mechanism, 4)waste ink absorber and 5)ink
sequence. Out of these mechanism, from 1) to 4) are physical
mechanism and parts which are mounted on the printer mechanism and
5) ink sequence is performed automatically by firmware. Also, unlike
previous models, since Stylus Color 440/640/740 has no engage/
disengage mechanism to change over pump mechanism and paper
feed mechanism, it is one of the major characteristics that pump and
platen are always at work whenever the PF motor is driven. The figure
below shows head positions when the ink system and various ink
sequence are performed.
PF Roller Drive Gear
Eject Roller
Drive Gear
Eject Roller
TransmissionGear
PF(Pump) Motor
Pinion Gear
Figure 2-10. Ink System Mechanism
Chapter 2 Operating Principles
Carriage Lock Lever
Cleaner Blade
Pump Roller
Cap Unit
Printable Area
2976 dot(360-dpi)
G F
Figure 2-11.
Major Ink Sequence Position on Carriage Working Area
Revision A
E D C B A
A: Dummy Pumping Position(CRHP)
B: Ink Dischage Position
C: Flashing Position
D: Wiping Complete/Rubbing start Position
E: I/C Replacement Position
F: ASF Pick up Position
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