Relay Function - Daewoo FRS(N)-U20IA Service Manual

5-3. Relay Function

■. FRS(N)-U20IA
1. Circuit Diagram
IC1
(MICOM)
Comp
R-Lamp
Louver Heater
F-Lamp
D-Heater
2. How it works;
Control
Comp
Louver Heater
D-Heater
CONTENTS
Comp
Louver Heater
D-Heater
Control Mode
Method
MICOM Port
Relay 1 #1≒5.0V
Relay 3 #3≒5.0V
Relay 5 #5≒5.0V
ON Condition
IC ULN2004
Output pin
#10≒0.7V
IC7 #12≒0.7V
#14≒0.7V
37
OFF Condition
IC ULN2004
MICOM Port
Output pin
#1≒0V #10≒12V
#3≒0V IC7 #12≒12V
#5≒0V #14≒12V
REMARKS