Spitting is performed at machine power-on, after uncapping from the maintenance
station to clear dormant nozzles, and during the printing process to ensure that
infrequently used nozzles are available when required to print. There must also be
spitting after a wipe cycle, except when the printhead is going to the cap position;
otherwise wiping causes distorted printing if the wiper has experienced any wear.
The trough below he print line is intended to capture the ink during a spit cycle when no
paper is present in the print area. The cup around the wiper is used when spitting is
required and paper is present in the print area. Spitting with paper in print area occurs
when a single page requires longer than 50 seconds to print. All spitting occurs in
trough. At power on, any paper in the print area is ejected.
Fig. 1.10 Print Maintenance Operation - Spitting