LG LRSC26980TT Service Manual - Page 40

Fan motor driving circuit freezer, mechanical area

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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. LRSC269**** Motor OFF Motor ON a , d part 5V 2 ~ 3V b part 2V or less 12 ~ 14V e part 2V or less 8 ~ 16V c , f part 0 V 0 V COMPRESSOR -FAN PWM COMPRESSOR -FAN LOCK FREEZER-FAN PWM FREEZER-FAN LOCK - 40 -

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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.
LRSC269
****
EXPLANATION FOR MICOM CIRCUIT
- 40 -
a ,
d
part
b
part
e
part
c ,
f
part
Motor OFF
5V
2V or less
2V or less
0 V
Motor ON
2 ~ 3V
12 ~ 14V
8 ~ 16V
0 V
COMPRESSOR
-FAN PWM
COMPRESSOR
-FAN LOCK
FREEZER-FAN PWM
FREEZER-FAN LOCK