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Theory of Operation 2-19
NovaJet 800 Series Service Manual
The power supply is fused using a 6.3A 250V fast blow type fuse.
The outputs share a common ground which is isolated from earth ground
with in the supply itself. Earth ground and DC ground are connected
external of the power supply.
The power supply will shut down under overload/short circuit conditions
on any output over the full range of input voltage. Overvoltage protection
is 20%-30% above nominal for the 24V output.
Thermal Dryer Assembly
To ensure prints are dry for unattended printing, the printer features a
thermal (hot air convection) drying system. The system monitors the
temperature and humidity in the environment and adjusts the heat to
optimize drying time and ensure consistent image quality. The fans blow
air past 1200 watt heating elements, quickly drying the media. The dryer
effectively dries prints up to 100 sq/ft/hr @ 250% ink saturation. The
dryer system easily mounts to the stand assembly. The dryer logic cable
connects the dryer to the right leg logic jack. The dryer power cord plugs
into the power entry module at the rear of printer.
The thermal drying system is composed of the dryer plenum, logic cable,
and Main PWA (humidity and temperature sensors). The dryer typically
stays on for approximately 3 minutes following a print job when the Dryer
is in the on mode. Auto-Cut Delay is the time set between successive
print jobs (dry time between prints).
The Dryer PWA has two thermistors which provide feedback to the Main
PWA firmware to raise or lower temperature inside the plenum. The
firmware in turn drives the dryer PWA Triac (attached to heatsink) to
deliver the current to the two 1200-watt heating elements. The dryer
may be turned on, off, or placed into the auto-mode. The maximum
temperature obtainable is approximately 52 degrees Celsius. The 60" unit
runs a little cooler than the 42" platform due to the additional length of the
1200-watt heating elements (twin 500 to 600 watt elements). The glass
fuse on the Dryer PWA will normally fail before an active component due
to an overcurrent condition.