Daewoo FRN-U20DAI, Service Manual

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28
1. Circuit Diagram
CONTENTS REMARKS
■
FRS(N)-U20DA
2. How it works;
#15
≒
12V
#14
≒
12V
#13
≒
12V
#12
≒
12V
#11
≒
12V
#10
≒
12V
#15
≒
12V
#14
≒
12V
#13
≒
12V
#12
≒
12V
#11
≒
12V
#10
≒
12V
#15
≒
0.7V
#14
≒
0.7V
#13
≒
0.7V
#12
≒
0.7V
#11
≒
0.7V
#10
≒
0.7V
#15
≒
0.7V
#14
≒
0.7V
#13
≒
0.7V
#12
≒
0.7V
#11
≒
0.7V
#10
≒
0.7V
OFF Condition ON Condition
#3
≒
0V #3
≒
5.0V Relay 3 H/B Heater
IC8
#7
≒
0V
IC8
#7
≒
5.0V Relay 7 Water (Dispenser)
#6
≒
0V #6
≒
5.0V Relay 6 Water (Ice)
#5
≒
0V #5
≒
5.0V Relay 5 Dispenser-Solenoid
#4
≒
0V #4
≒
5.0V Relay 4 Dispenser-Lamp
#9
≒
0V #9
≒
5.0V Relay 9 D-Heater
#8
≒
0V #8
≒
5.0V Relay 8 Geared-Motor
#10
≒
0V #10
≒
5.0V Relay 10 F-Lamp
#11
≒
0V #11
≒
5.0V Relay 11 Cube-Solenoid
Relay 12
Relay 2
Relay 1
Control Mode
Method
IC7
IC ULN2004
Output pin
#12
≒
5.0V
#2
≒
5.0V
#1
≒
5.0V
MICOM Port
#12
≒
0V
#2
≒
0V
#1
≒
0V
MICOM Port
IC7
Comp
IC ULN2004
Output pin
Water Pipe Heater
R-Lamp
Control
IC1
(MICOM)
D-Heater
Louver Heater
Comp
R-Lamp
F-Lamp