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Service Manual
5-3
Theory of Operation
5
Printhead
The printhead is the heart of the printer. It is the device that actually places ink
onto paper. The printhead contains the reservoirs for the ink it uses as well as a
series of piezo-electric devices that squirt ink onto the paper.
The printhead features 124 jet nozzles to force ink out of the printhead onto
paper. The printhead has four banks of nozzles:
■
31 cyan
■
31 yellow
■
31 magenta
■
31 black
Each bank of nozzles are arranged in diagonal rows. A vertical distance between
any two adjacent jets is two pixels. Given that a row of jets is 31 jets in height,
the printhead can print a swath 62 pixels in height by printing 31 pixel lines on a
forward pass and then printing the interleaving 31 lines on the return pass of the
printhead. Variations on this interleaved printing scheme are used to actually
print in the printer’s two print modes: Standard and Enhanced. Cyan jet #0,
shown in the illustration, is a nonfunctional jet that is only used as a reference
point for hardware and software development.
Figure 5-2 The printhead and its jet nozzles
8818-35
Printhead face
49 pixels
Cyan jet #1
Cyan jet #0
Cyan jet #31
Yellow jet #1
Magenta jet #1
Black jet #1
Black jet #31
Head width = 994 pixels
Close up view of adjacent jets
2 pixels between
adjacent jets vertically
7 pixels between
adjacent jets horizontally
. .
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