Theory of Operation 2-7
Printhead
The printhead is the heart of the printer, spanning nearly the length of the drum. Using
its 1236 jet nozzles (309 jets for each primary color), with a horizontal motion of
slightly less than 5 mm (0.2 inches), the printhead can print the entire image on the
rotating drum. The printhead provides one size ink drop, which is used for all print-
quality modes.
s8500-012
Jet Stack
Reservoir
Purge Tube
Drum
Printhead
Head Driver Board
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