Samsung ASA07C5(6)ME Service Manual

Contents

Samsung Electronics5-25-2 Fault Diagnosis by Symptom5-2-1 No Power (completely dead)-Initial diagnosis1) Checklist :(1) Is input voltage normal?(2) Is AC power linked correctly?(3) Is output voltage of DC regulator IC KA78L05 (IC02) normal? (4.5VDC-5.5VDC)2) Troubleshooting procedureReplace PCBdisplayIs DC voltage of PCBdisplay normal?Remove power cord and plug inagain in approx. 5 secondsIs operation lamp blinking?Does operation start whenON/OFF button on the remotecontroller unit pushed?Is transmission display of theremote controller unit blinking?Is "beep"sound heard from the mainunit?Is DC voltage of the PCB modulenormal?Are voltages of #33 (compressor),of the micom normal? 5VDCIs voltage of #32 (indoor fan) of themicom normal?Is voltage at #10 terminal of the Micom normal?0VDCIs voltage at #9 terminal of the Micom normal?5VDCIs rating voltage ±10% rangeapplied to the primary side(~,~)of the “BD71”•Check linkage betweenpower cord andterminal tap•Check fuseIs 325VDC appear in thesecondary side (+, -)of “BD71”ReplaceSMPS PARTSYESNO YESNOYESYESYESNOYESYESYESDC5V10ms250nsNONOOKYESYESYESYESNONOYES NormalRefer to remote controlunit fault diagnosisReplace PCBmodule.Is output voltage of ICO2 normal?Check connectionscompressor andindoor fan.Are voltages at RY71(Compressor) normal?DC12V Is voltage at SS71(indoor fan)ReplaceRY71 and SS71NONONOIs voltage output terminal ofPC814(PC02) normal?Replace ICO2Check PCB pattern.Replace main PCB.Replace PC814(pc02)ReplacemicomIs voltage at #3 terminal of the micomnormal?Are voltage at #11 and #12 of themicom normal?NONO NOYESNONONOYESOKIs operation normal?Replace resonator (X301)