8-2-4 Load / Buzzer Drive & Open Door Detection Circuit
1. Load Drive Condition Check
To measure outputs of the control board, check voltages between the pins for the following components:
2. Fan motor driving circuit (freezer compartment fan mechanical room)
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.
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F-FAN C-FAN
Pin number Pin 1&2 of con4 Pin 4&5 of con4
MOTOR OFF 2V or less 2V or less
MOTOR ON 13V~15V 13V~15V
Circuit Pin Number Pin Number Output Voltage
Compressor Con1 pin1 Con1 pin3 115 VAC
Defrost heater Con2 pin1 Con1 pin3 115 VAC
F,R-lamp Con2 pin,3.5 Con1 pin3 115 VAC
Frech Door Heater Con3 pin3 Con1 pin3 115 VAC
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