LG LSC27990TT Service Manual page 30

EXPLANATION FOR MICOM CIRCUIT
1-11. Fan motor driving circuit (freezer, mechanical area)
1. The circuit cuts all power to the fan drive IC, resulting in a standby mode.
2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc.
3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition.
Motor OFF
Motor ON
(1) GR-G277STSA(LSC27990TT)
a , d part
5V
2 ~ 3V
- 30 -
b part
2V or less
12 ~ 14V
b
a
e
d
e part
2V or less
8 ~ 16V