Relay Function - Daewoo FRN-U20IB series Service Manual

5-3. Relay Function

- Basic Model
1. Circuit Diagram
IC1
(MICOM)
Comp
R-Lamp
Louver Heater
F-Lamp
D-Heater
2. How it works;
Control
Comp
Louver Heater
D-Heater
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CONTENTS
Comp
Louver Heater
D-Heater
ON Condition
Control Mode
Method
MICOM Port
Relay 1 #1≒5.0V
Relay 3 #3≒5.0V
Relay 5 #5≒5.0V
IC ULN2004
MICOM Port
Output pin
#10≒0.7V #1≒0V
#12≒0.7V #3≒0V
IC7
#14≒0.7V #5≒0V
34
REMARKS
OFF Condition
IC ULN2004
Output pin
#10≒12V
#12≒12V
IC7
#14≒12V