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Service Manual
5-9
Theory of Operation
5
To perform the maintenance cycles, the drum will rotate counterclockwise to
three different positions: Air knife, wipe, and purge.
For example, to perform a purge cycle:
■
The drum is rotated counterclockwise to move the cam to the purge
position which forces the maintenance station against the faceplate
and allows the cam pin to move towards the drum following a deeper
channel in the maintenance track which closes the air valve.
■
The vacuum pump is started and performs a 4- or 5-second purge.
■
The drum is then rotated clockwise to move the cam pin up a ramp in
the track to open the air valve and remove the vacuum.
■
The drum continues to rotate clockwise to move the purge chamber
away from the faceplate.
■
Ink from the purge chamber runs out of the cutouts in the gasket onto
the drip plate and into the waste bin.
Figure 5-6 The maintenance station cam
9482-97
Waste bin track
Maintenance track
Purge
Air knife
Maintenance
station pin
Wipe