LG GR-642APA, Service Manual

Page: 26 / 44

2. Buzzer Drive Condition Check
3. Open Door Detection Circuit Check
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Tone (Beep~) when the button on the display is pushed Alarm for open door (beep-beep-beep) 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
1.9 kH
z
(Beep~) OFF
0.1 s 0.5 s
0 V
5 V
0 V
5 V
1.9 kH
z
(Beep~)
(PIN NO.15)
Closed 0 V
Open 5 V
Freezer/
Refrigerat Door
Measurement
Location
A
B