Operation Panel Circuit - Citizen iDP-3535 Service Manual

iDP-3535 Service Manual

4. Operation Panel Circuit

This is composed of switches and LED.
1) Switches
S1 (LF switch) and S2 (LINE switch) are provided. S1 is controlled by R18, C6, and IC7 (74LS04),
and S2 by R17, C5, and IC7 (74LS04).
2) LED
LED1 (POWER) is lit when the power is on. LED2 (SEL / ALARM) is a monitor for online and alarm.
LED1 is connected to R14, and LED2 is connected to R16, Tr3, and R15, and both LEDs are controlled
by PB4 of IC1.
Fig. 4-1 Operation Panel Circuit
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CITIZEN