LG LRFC25750ST - BUZZER DRIVE CONDITION CHECK; OPEN DOOR DETECTION CIRCUIT CHECK

2. Buzzer Drive Condition Check
3. Open Door Detection Circuit Check
- 28 -
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 s0.2 s 2 s
0 V
5 V
0 V
5 V
2.63 kz
( Ding~) 2.21 kz ( Dong~)
(PIN NO.30 & PIN NO.27)
Closed 5 V
Open 0 V
Freezer/
Refrigerator Door
Measurement
Location
A
B
Tone (Ding~Dong~) when the button on
the display is pushed.
Alarm for open door
(beep-beep-beep)