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Theory of Operation 2-20
NovaJet 800 Series Service Manual
The Main PWA has a humidity sensor and a temperature sensor mounted to the
back side. The sensors monitor ambient room temperature and humidity. Prior to
print operations the printer should be allowed to acclimate to the environment for
at least 15 minutes. The plenum may be preheated using the F6 key (2nd key
from the top at right side of control panel) under the Sensor Status Menu.
The Dryer PWA is internal to the right side of the dryer plenum. The green LED
(D2) on the Dryer PWA indicates that the triac is functioning properly and that
power is applied to the two heating elements.
Sensor Status Menu
From the top-level menu of the printer, navigate the menu tree as follows.
Utility Menu
Service Menu
Diagnostic Menu
Accessory Menu
Sensor Status
The printer LCD will display the following information:
Dryer Mode: cccccccc
Plenum T. = ## deg. C
MBoard T. = ## deg. C
MBoard H. = ## pct. RH
Available mode readouts include: On, Off, Auto and Disabled.
The optical sensors are designed to inform the Main PWA when there is not a
proper amount of slack in the media by sensing the ‘curl’ of the media at the
bottom of its loop. This method is used so that all approved forms of media
(including transparent backlit media) is able to take advantage of the power feed
and take-up system.