LG LFC20760 Series, Service Manual

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3. Buzzer Drive Condition Check
4. Open Door Detection Circuit Check
OFF
IC1 ( ) 0 V
IC1 ( ) 0 V
Measure-
ment Location
Condition
0 V
5 V
0 V
5 V
0.5 s 0.5 s
2.63 kz(Beep~) OFF
0.05 s 0.1 s 0.2 s 2 s
0 V
5 V
0 V
5 V
2.63 kz (Ding~) 2.21 kz (Dong~)
A
B
Tone (Ding~Dong~) when the button on
the display is pushed.
Alarm for open door
(beep-beep-beep)
Pin No. 14 (Refrigerator Door)
Pin No. 15 (Freezer Door)
Closed 5 V
Open 0 V
Freezer/
Refrigerator Door
Measurement
Location
REFRIGERATOR DOOR
SWITCH
FREEZER DOOR
SWITCH
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