Kodak 700, 630, 500 service manual Power Supply

NovaJet 500/630/700 Series Service Manual

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.

THEORY OF OPERATION

Theory of Operation 2-17