LG GR-S552 Service Manual page 22

7-2-5 TEMPERATURE SENSOR CIRCUIT
The upper CIRCUIT reads REFRIGERATOR temperature and DEF-SENSOR temperature for defrosting into MICOM.
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows.
SENSOR
Refrigerator Sensor
Defrosting Sensor
7-2-6 DOOR OPEN DETECTION CIRCUIT
CHECK POINT
POINT A Voltage
POINT B Voltage
Measurement Location
Freezer / Refrigerator Door
Closed
Open
NORMAL(-30 °C ~ 50 °C)
0.5 V ~ 4.5 V
(Pin No.13)
- 22 -
SHORT-CIRCUITED
0 V
0V
5V
OPEN
5 V