Power Supply; Beeper And Fans - ENCAD 60e Service Manual

Figure 2-12 shows the keypad after the printer has been turned on
and finished the start up process. As seen in the figure, the control
buttons are assigned to the corresponding command that is dis-
played closest to the physical location of the button.

Power Supply

An internal UL recognized switching power module supplies power
for the Novajet PROe printer. It provides a constant 24VDC
output from input voltage in the range of 90-246 VAC. A power
switch turns the power on and off. The 24VDC is applied to the
MPCB where it is further regulated and seperated into 24VDC,
13VDC, and 5VDC. The 24V supply is used for: the stepper
controller (which advances the paper); the servo controller (which
moves the Carrier); and power to fire the inkjets. The 5V supply
powers the logic circuits.
The power supply is fused using a 2A 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.

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 on the Novajet PROe series print-
ers.
A single fan, located behind the power supply, is used for cooling
the power supply. Air blows over the power supply and the heated
air is forced out the back of the printer.
Novajet PROe Series Service Manual
Theory of Operation 41