Epson TM-L90 series - Power circuit

Appendix F-4 Overview of Electric Circuits Rev.B
Confidential
Power circuit
The power circuit generates three voltages (+5 V, +24 V and +3.3 V). Each voltage is supplied to
the circuits listed below:
Power Supply On/Off Control
The figure below shows a block diagram of the power supply and on/off control circuit.
The logic circuit operates according to the specifications listed in the table below.
Table F-2 Output voltages and their applications
Voltage Level Application
+5 V • Logic circuit (used mainly for circuits around CPU)
+24 V • Print mechanism power supply
• Drawer kick power supply
• Interface circuit board unit power supply
+3.3V
• Logic circuit (used mainly for circuits around memory)
Table F-3 Logic circuit functions
DC IN Dip switch 1-1 Power Switch DC Out
IN ON OFF ON
OFF 1 sec ON ON
OFF 3 sec ON OFF
Power
supply
AC
DIP SW
Power switch
DC output
Logic circuit
Semiconductor switch
Power off command
TM-L90