LG LRDN22734SB Service Manual page 31

8-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
LOAD TYPE
Measurement Location (IC6)
ON
Condition
OFF
2. Fan motor driving circuit (freezing compartment fan)
1. This circuit makes standby power 0 by cutting off power supplied to ISs inside of the fan motor in the fan motor OFF.
2. This is a circuit to perform a temporary change of speed for the fan motor and applies DC voltage up to 7.5V ~ 16V to motor.
3. This circuit prevents over-driving the fan motor by cutting off power applied to the fan motor in the lock of fan motor by
sensing the operation RPM of the fan motor.
MOTOR OFF
MOTOR ON
FREEZER DOOR
SWITCH
REFRIGERATOR
DOOR SWITCH
DEFROSTING
COMP
HEATER
NO.13 NO.14
part
a
2V or less
13V~15V
G5SB-14
LAMP
POWER MODE
NO.16
1V or below
12V
part part
b
c
0V 5V
0V 2V~3V
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TCM VALVE
(DISPENSER
(OPTIONAL) MDL)
NO.12 NO.15