LG GR-J303TS Service Manual - Page 17
Buzzer driving circuit located on display PCB, 2-5. SWITCH INPUT CIRCUIT, LED MODULE TYPE
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(2) Buzzer driving circuit (located on display PCB) g Only the buzzer sound for the Lock/Unlock operation is shown in this SVC technical manual. LED MODULE TYPE 78 P35 (INT1) 79 P36 (PWM3/TC3/PDO3) Status Measuring Ex) Lock: "Ding-D-Dong" sound Ex) Lock: "Ding-D-Dong" sound Off point 45ms 45ms 45ms 45ms 70ms 750ms 45ms 45ms 45ms 45ms 70ms 750ms IC101 (Pin 3/61) 5V 5V 5V 0V 0V 5V 5V IC101 (Pin 2/62) 0V 0V 1046.5Hz 1174.7Hz 1318.5Hz 0V 1568.0Hz 1318.5Hz 1046.5Hz 3-2-5. SWITCH INPUT CIRCUIT Following circuits are input circuits for detecting signal of the test switch for checking refrigerator or the reed switch of the single motor damper. REED Switch - 17 -
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(2) Buzzer driving circuit (located on display PCB)
g
Only the buzzer sound for the Lock/Unlock operation is shown in this SVC technical manual.
3-2-5. SWITCH INPUT CIRCUIT
Following circuits are input circuits for detecting signal of the test switch for checking refrigerator or the reed switch of the
single motor damper.
- 17 -
REED Switch
78
79
P35
(INT1)
P36
(PWM3/TC3/PDO3)
LED MODULE TYPE
Ex) Lock: "Ding-D-Dong" sound
Ex) Lock: "Ding-D-Dong" sound
Off
IC101 (Pin 3/61)
5V
IC101 (Pin 2/62)
0V
Measuring
point
Status
45ms
1046.5Hz
1174.7Hz
1318.5Hz
45ms 45ms 45ms 70ms
750ms
5V
0V
5V
0V
45ms
1568.0Hz
1318.5Hz
1046.5Hz
45ms 45ms 45ms 70ms
750ms
5V
0V
5V
0V