LG GR-349SQF.CEWQEHU Service Manual page 23

(3)BUZZER OPERATION CHECK
CONDITIONS
MEASURING
POINT
IC1 (No.14 Pin)
IC1 (No.13 Pin)
DISPLAY FUNCTION BUTTON RING
(DING~ DONG~)
0.05s 0.2s
5V
0V
5V
0V
2.66kh
z (DING~)
0.1s 1s
2.232kh
z (DONG~)
- 23 -
DOOR OPEN ALARM
(SCREECHING)
0.5s 0.5s
5V
0V
5V
0V
3.1kh OFF
z
OFF
ov
ov