DOWNLOAD LG GA-449 Service Manual ↓ Size: 3.45 MB | Pages: 48 in PDF or view online for FREE

Model
GA-449
Pages
48
Size
3.45 MB
Type
PDF
Document
Service Manual
Brand
Device
Refrigerator
File
ga-449.zip
Date
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LG GA-449 Service Manual ▷ View online

5) TEMP SENSOR CIRCUITS
u
GA-479**L*/449**L*
u
GA-479**Q*,**C*/449**Q*,**C*
The above circuit reads surrounding temperature, FREEZER temperature, REFFIGERATOR temperature, OPTI ZONE
temperature into MICOM( IC1). OPEN or SHORT state of each SENSOR is as follows
- 33 -
SENSOR
CHECK POINT
NORMAL (-30°C~50°C)
SHORT
OPEN
REFRIGERATOR SENSOR
POINT A Voltage
OPTI ZONE SENSOR
POINT B Voltage
FREEZER SENSOR
POINT C Voltage
0.5V ~ 4.5V
0V
5V
R-EVA SENSOR
POINT D Voltage
M-EVA SENSOR
POINT E Voltage
RT SENSOR
POINT F Voltage
A
C
D
F
C
D
A
F
B
E
A
C
D
F
C
D
A
F
B
E
6) SWITCH INPUT CIRCUIT
The following circuit is a test switch input circuit for checking the refrigerator.
u
GA-479**L*,**Q*,**C*/449**L*,**Q*,**C*
7) DC R- BOX FAN MOTOR
u
GA-479**L*,**Q*/449**L*,**Q*
8) 3WAY VALVE
u
GA-479**L*/449**L*
u
GA-479**Q*/449**Q*
- 34 -
9) TEMPERATURE COMPENSATION
u
GA-479**L*,**Q*,**C*/449**L*,**Q*,**C*
• TEMPERATURE COMPENSATION TABLE by adjusting resistance values. (the temp difference compared to the present
temp.) 
eg) If the compensation resistance of freezer compartment is changed from 10K (present resistance) to 18K (revised
resistance), the temp of freezer compartment goes up by +1.0°C.
- 35 -
REFRIGERATOR AND FREEZER ROOM
RESISTANCE VALUES(RCR1,RCR2)
TEMPERATURE COMPENSATION
REMARKS
180 k
Ω
+2.5°C
COMPENSATE WARMLY
56 k
Ω
+2.0°C
33 k
Ω
+1.5°C
18 k
Ω
+1.0°C
12 k
Ω
+0.5°C
10 k
Ω
0°C
STANDARD
8.2 k
Ω
-0.5°C
5.6 k
Ω
-1.0°C
3.3 k
Ω
-1.5°C
2 k
Ω
-2.0°C
470 
Ω
-2.5°C
COMPENSATE COOLLY
• TEMPERATURE  COMPENSATION OF REFRIGERATOR ROOM
• This circuit is aimed to input the necessary temperature compensation values into the MICOM in order to adjust the
refrigerator temperature which is different in each model.
- 36 -
470 
Ω
2 k
Ω
3.3 k
Ω 5.6 kΩ 8.2 kΩ 10 kΩ
12 k
Ω
18 k
Ω
33 k
Ω
56 k
Ω 180 kΩ
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
4.5 °C
5 °C
470
Ω
change
Up
Up
Up
Up
Up
Up
Up
Up
Up
Up
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
4.5 °C
2 k
Ω
Down
change
Up
Up
Up
Up
Up
Up
Up
Up
Up
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
4 °C
3.3 k
Ω
Down
Down
change
Up
Up
Up
Up
Up
Up
Up
Up
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
3.5 °C
5.6 k
Ω
Down
Down
Down
change
Up
Up
Up
Up
Up
Up
Up
2 °C
1.5 °C
1 °C
0.5 °
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
3 °C
Refrigerator 8.2 
k
Ω
Down
Down
Down
Drop
change
Up
Up
Up
Up
Up
Up
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
2.5 °C
(RCR)
10 k
Ω
Down
Down
Down
Down
Down
change
Up
Up
Up
Up
Up
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
2 °C
12 k
Ω
Down
Down
Down
Down
Down
Down
change
Up
Up
Up
Up
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
1.5 °C
18 k
Ω
Down
Down
Down
Down
Down
Down
Down
change
Up
Up
Up
4 °C
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
1 °C
33 k
Ω
Down
Down
Down
Down
Down
Down
Down
Down
change
Up
Up
4.5 °C
4 °C
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
0.5 °C
56 k
Ω
Down
Down
Down
Down
Down
Down
Down
Down
Down
change
Up
5 °C
4.5 °C
4 °C
3.5 °C
3 °C
2.5 °C
2 °C
1.5 °C
1 °C
0.5 °C
No
180 k
Ω
Down
Down
Down
Down
Down
Down
Down
Down
Down
Down
change
Modification
resistance
Current
resistance
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