Principles Of Operation; Power Supply Circuitry - Epson TM U200D - B/W Dot-matrix Printer Technical Manual

Principles of Operation

Power Supply Circuitry

The power supply circuit is compact, uses a switching method, and is attached to the main
circuit board.The following sections describe the power supply circuitry for the printer. The
following table shows the power supply voltages and their usages.
Power supply voltage usage
Voltage
+5V
+24V
Filter circuit
The +24V (24V to 30V) DC power is input from the CN1 connector through the filter circuit. The
filter circuit reduces outside noise and prevents internally-generated noise from flowing
through the +24V power line.
+24V DC circuit
The +24V power from the filter circuit is input to printer power and the +5V regulator circuit.
Printer power and drawer drive power are the converted +24 ±1V that is regulated by series of
regulators (U2 to U4).
2-16 Mechanism Configuration and Operating Principles
Usage
Logic circuit
Interface circuit board
Operation panel circuit
Various detector circuits
Printer:
Motor, carriage
Motor, paper feed
Print head
Drawer kick-out drive
Rev.B