Canon bj-20 User Manual

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Choosing Between Print Quality and Speed
By default, the printer prints at high quality - 83 characters per second 
(cps). For some work where speed is more important than print quality, 
4
Use a ballpoint pen (or similar object) to set the switches.
Caution
Changes should be done when the printer is turned off; 
otherwise the changes will not be reflected in the current printing 
session.