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Theory of Operation 2-17
NovaJet 500/630/700 Series Service Manual
THEORY OF
OPERATION
Power Supply
An internal UL recognized switching power module supplies power for
the NovaJet 500/630/700 Series printers. It provides a constant
24VDC output from input voltage in the 90-132 VAC and 180-246 VAC
ranges. A power switch turns the power on and off. The 24VDC is
applied to the MPWA where it is further regulated and separated into
24VDC, 13VDC, and 5VDC. The 24V supply is used for: the stepper
controller (which advances the paper); the servo controller (which
moves the Carriage); and power to fire the inkjets. The 5V supply
powers the logic circuits.
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 condi-
tions on any output over the full range of input voltage. Overvoltage
protection is 20%-30% above nominal for the 24V output.
Beeper and Fans
The beeper contains built-in driver circuitry so that it beeps under
firmware control. The beeper alerts the user to error conditions.
There exists three types of fans that can be on the NovaJet 500/630/
700 series printers.
A single fan, located behind (below for the NovaJet 750) the power
supply, is used for cooling the power supply. Air blows over the power
supply and the heated air is forced out of the printer.
A fan is located inside the platen with its fan vent seen from under
the platen on the right side of the printer. This fan provides suction
on the platen bed and holds the paper (media) flat during the printing
process. The 60 inch model has an additional suction fan located near
the center of the printer inside the platen.