Epson STYLUS 4001968 Service Manual page 28

Operating Principles
2.2.1 Printer Mechanism
The printer mechanism of this printer uses a drop-on-demand ink jet system similar to the system
used on all other Epson ink jet printers. However, the printhead in this system is completely
redesigned to make it compact and highly reliable. The figure below shows the structure of the
printhead and ink supply system.
M L P MLP is the abbreviation for Multi-Layer Piezoelectric element. When a drive pulse
(voltage) is applied, this element pushes the vibration plate, compressing the cavity
for ink injection from the nozzle.
Ink supplied from the ink cartridge is stored in this space and is injected from the
Cavity
nozzles when the vibration plate compresses this area.
Nozzles These inject ink against the paper's surface in response to the application of the
print signal. There are 48 individual nozzles making up this printhead.
Cartridge needle
\
Filter
C a v i t y
(Nozzle)
Nozzle plat
2-2
s e t
Structure of Printhead
Figure 2-2.
STYLUS 800 Service Manual
Printhead driver board
I
(Multi-Layer
supply
nk tank
Rev. A
'