LG LBC20514TT Service Manual page 26

3. Buzzer Drive Condition Check
Condition
Tone (Ding~Dong~) when the button on
Measure-
ment Location
5 V
IC1 ( )
A
0 V
5 V
0 V
IC1 ( )
B
4. Open Door Detection Circuit Check
Measurement
Location
Freezer/
Refrigerator Door
Closed
Open
the display is pushed.
0.05 s 0.2 s 0.1 s 2 s
2.63 kz (Ding~) 2.21 kz (Dong~)
(PIN NO.63 & PIN NO.8)
5 V
0 V
Alarm for open door
(beep-beep-beep)
0.5 s
5 V
0 V
5 V
0 V
2.63 kz (Beep~)
- 26 -
OFF
0.5 s
0 V
0 V
OFF
FREEZER DOOR
SWITCH
REFRIGERATOR DOOR
SWITCH