ENCAD 42e, Руководство по обслуживанию

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40 Theory of Operation
Novajet PROe Series Service Manual
The paper sensor circuitry senses for the presence of loaded media.
It does this automatically during the start-up and load sequences. It
also constantly monitors the media during printing to determine if
the media has run out.
If no paper is sensed, the paper sensor sends this information to the
MPCB, which immediately begins an ‘out of paper’ subroutine. This
subroutine starts the LEDs on the printer to blink (green blinks slow
while yellow blinks faster.) It also informs the host computer of the
situation and stops the printer from printing until more media is
loaded.
The sensor also checks for the size of the media loaded so it can
determine the proper printing parameters.
Keypad
The Keypad is located on the right side of the printer and consists of
8 variable-action control buttons and an LCD graphics display. The
control buttons are assigned different functions and are dependant
upon the selections that are presently shown on the graphics display.
There are four buttons on the left of the display and four buttons on
the right, with the display showing up to eight possible selections.
Figure 2-12. Main Menu.