Samsung RF23HT Series Service Manual

101TROUBLESHOOTING4-2-14. If ICE Water is not supplied1. Please shut the water supplying prior to repair.2. Power is applied to the one end of wires. Be careful when disassembling not to get an electric shock.StartIs the confirmingsound of the valve operation heard whenIce maker test switch pushed?Does Main PCB IC01MICOM #90 voltage change5V/0V?Does Main PCB IC01MICOM #88 voltage havehigh(5V) output?Does Main PCBIC73-"13" have about 0.7Voutput?Is the contactpoint of main PCB RELAY RY78normal?MAIN PCB normal-- Need to check the other parts① Check the wire between Icewater valve↔MAIN PCB② Ice water valve itself has troubleor bad contact of connector③ Check the connection hoseNormal(Check Icewater valve hose)Check solderingshort/Replace PCBCheck solderingshort/Replace PCBCheck solderingshort/Replace PCBCheck solderingshort/Replace PCBPCB Typical Ground REG1-GND☞ Checking method of voltage Based on PCBtypical Ground REG1-GND1) Check the voltage of IC73-"4"(same voltage asIC01 “88”)- ICE Water valve waiting (about 0V)Based on PCB typical Ground REG1-GND2) IC73-"13" voltage- ICE Water valve Waiting (about 12V±0.8V)- ICE Water valve operating (about 0.7V±0.5V)3) Check the voltage of Water Valve operating(AC voltage)=> For checking the Relay RY78 operating.CN70-"5"(Red) ↔ CN73_1-"1"(Purple)- ICE Water valve waiting (about AC 0V)1) Ice Water(R) Valve