Epson TM U200D Technical Reference - Page 57

Principles of Operation, Power Supply Circuitry

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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 Usage Logic circuit +5V Interface circuit board Operation panel circuit Various detector circuits +24V Printer: Motor, carriage Motor, paper feed Print head Drawer kick-out drive 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 Rev.B

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2-16
Mechanism Configuration and Operating Principles
Rev.B
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.
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).
Power supply voltage usage
Voltage
Usage
+5V
Logic circuit
Interface circuit board
Operation panel circuit
Various detector circuits
+24V
Printer:
Motor, carriage
Motor, paper feed
Print head
Drawer kick-out drive