Service Manual
5-13
Theory of Operation
5
Vacuum for the purge cycle is obtained from a vacuum pump and a vacuum
accumulator. A small vacuum pump, running for about 75 to 90 seconds, creates
a strong vacuum in the vacuum accumulator. Then an air valve is energized for
a fraction of a second, exposing the printhead faceplate to the strong,
accumulated vacuum to suck debris and bubbles out of the printhead nozzles.
With the air valve once again de-energized, air is metered through the 7-mil
orifice to gradually release the vacuum at the faceplate.
Figure 5-8 The cap/wipe/purge assembly and vacuum system
9661-132
Cap/wipe/purge assembly
Solenoid valve "unenergized"
Solenoid valve "energized"
Filter
Air
Air
7 mil
orifice
Pump
Vacuum system
Vacuum
accumulator
Cap/wipe/purge
assembly motor
Cap/wipe/purge
assembly
Cap/wipe/purge assembly transport
Cap/wipe/purge
assembly belt
Cap/wipe/purge assembly
home sensor (on I/O 2 board)
Wiper element
Drum
Printhead
Summary of Contents for PHASER 380
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Page 346: ...C 4 Phaser 380 Color Printer C Wiring Diagrams Figure C 6 Wire dressing behind the printhead...