69TROUBLESHOOTING4-2-3. If ICE Room Fan does not operate- This refrigerator has BLDC FAN motor. BLDC motor is driven by DC7~12V.- When COMP ON, normally operates with F-FAN motor.- If there is any trouble, you should select the self-diagnostic function to check the trouble before power off.StartExecute manual operationNoYesYesNoYesYesNoNoIs COMPRESSOR ON ?Is the Ice Roomtemperature suitable forthe Fan working?£ Predicted Cause˝ FAN-MOTOR troubles itself˞ Bad wiring connections.˟ Wrong Input of the fan motor rotation pulseReferenceCN76 #2 will generate the pulse signal when motor rotates.These signals will be input into MICOM.Unless signals are not input during motor operating, will be ON10seconds after fan OFF. But if signals are not still taken, theabove operation will be retried four times more. If signals are nottaken continuously, the motor will be restarted after 10 minutes.This function is against the case that motor movement would berestrained by foreign matters like ice.Is the voltage betweenMAIN PCB CN1-”3”(Black) and CN76-”1”(Black) around DC7~12V?Does DC7~12V alternatewith below DC2V between MAIN PCB CN1-”3”(Black) and CN75-”2”(Yellow)?FAN works normallyOperationtemperature/readyReplace MAIN PCBFAN pulse voltageCN76-”2”(Brown) Typical PCB GroundCN1-”3”(Black)Ice Room control temperatureIce ON 8.6×(-13)Ice OFF 26.6×(-3)The voltage is variable due to pulsesignal but measured about 2~3V with theMulti-Meter.ó Display for checking the self-diagnostic functionIce Room FAN ERRORó Checking method of Ice Room FAN Motor Voltage with the voltage between typicalPCB Ground CN1-”3”(Black) and Ice Room FAN ; CN76-”1”(Black) shall be lessthan DC 6~12V.- Additional check if resistance values are different after measurement.Typical PCB GroundCN1-”3”(Black)1) Ice Room - FAN
