LG GR-B197WV - Page 35

3. Buzzer Driving Circuits
4. Door Opening Detecting Circuits
* Door opening detecting switch ( A - B) can not detect door opening when switch ( A - B) or lead wire is failed even though
freezer door switch is normal.
* Refrigerator lamp shall not be on when refrigerator door switch can not detect door opening detecting switch ( C - D) or
home bar door switch ( E - F).
MICOM CIRCUIT DESCRIPTION
- 35 -
CONDITIONS
Bell sounds when button on Beep sounds when warning
MEASURING
dosplay is pressed. door opening.
OFF
POINTS
IC1 (No. 50 Pin) 0 V
IC1 (No.51 Pin) 0 V
MEASURING POINTS
FREEZER / IC1 (MICOM) (Pin No. 46 and 48)
REFRIGERATOR DOOR
CLOSED 5 V (A - B, C - D, E - F both ends S/W off conditions)
OPEN 0 V (A - B, C - D, E - F both ends S/W on conditions)
0.05 s
2.63 kz (DING)
2.63 kz (BEEP) OFF
2.21 kz (DONG)
0.2 s 0.1 s 0.4 s 0.5 s 0.5 s
5 V
0 V
5 V
0 V
5 V
0 V
5 V
0 V