Samsung RF23HT Series Service Manual

89TROUBLESHOOTING4-2-3. 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 IceRoom temperature suitable forthe Fan working?※ Predicted Cause① FAN-MOTOR troubles itself② Bad wiring connections.③ Wrong Input of the fan motor rotation pulseReferenceCN76 “6” 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, the aboveoperation will be retried four times more. If signals are not takencontinuously, the motor will be restarted after 10 minutes.This function is against the case that motor movement would berestrained by foreign matters like ice.- When pressing the ICE TEST S/W for a certain period of time (over1.5sec), the function is accomplished. After beginning of TESTmode, Ice maker heater turns on for initial 2 minutes, if the icemaking temperature is below 0℃.- If it exceeds 0℃, Ice maker heater turns on for initial 30 seconds.- After Ice maker heater turns on for 30 seconds, it turns off andthen Ice maker motor turns on.- As the Ice maker motor turns on, TEST MODE COUNT operates.(6 minutes count)Condition- Ambient temperature : 32℃/75%- Notch : 2℉/38℉(-19.0℃/3.3℃)Initial full of ice bucket capacity : 794 g, 58eaIs the voltage betweenMAIN PCB Ground REG1-GNDand CN76-”2” (Blue) aroundDC7~12V?Does DC7~12V alternatewith below DC2V between MAINPCB Ground REG1-GNDand CN76-"2"(Blue)?FAN works normallyOperationtemperature/readyReplace MAIN PCBGroundFAN pulse voltageCN76-”6”(Pink)PCB Typical GroundREG1-GNDIce Room control temperatureIce ON 8.6℉(-13℃)Ice OFF 26.6℉(-3℃)The voltage is variable due to pulse signalbut measured about 2~3V with the Multi-Meter.☞ Display for checking the self-diagnostic function☞ Checking method of Ice Room FAN Motor Voltage with the voltage between Ice Room FAN ;CN76-"2"(Blue) shall be less than DC 7~12V.- Ice Room FAN Motor Voltage shall be less than DC 7~12V.PCB Typical GroundREG1-GND1) Ice Room - FANIce Room FAN ERROR