LG LRFC22750TT Service Manual page 30

3. Open Door Detection Circuit Check
Measurement
Location
Freezer/
Refrigerator Door
Closed
Open
8-2-5 Temperature Sensor Circuit
The upper CIRCUIT reads REFRIGERATOR temperature, FREEZER T emperature, and DEFROST -SENSOR temperature
for defrosting and the indoor temperature for compensating for the surrounding temperature into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows:
SENSOR
Freezer Sensor
Refrigerator Sensor
Defrosting Sensor
Room Temperature sensor
CHECK POINT
POINT A Voltage
POINT Voltage
B
POINT Voltage
C
D
POINT Voltage
7
1
2
(PIN NO.30 & PIN NO.37)
5 V
0 V
7
5
6
NORMAL (-30¡C ~ 50 ¡C)
0.5 V ~ 4.5 V
- 30 -
SHORT-CIRCUITED OPEN
0 V 5 V