Samsung AQ07A1VE Service Manual

Also see for AQ07A1VE: Installation manual Owner's instructions Service manual

Contents

Samsung AQ07A1VE Service Manual Manual pdf 29 page image

5-2 Samsung Electronics5-2 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) Are connections between primary side, secondary side of the power transformer and PCB good.(4) Is output voltage of DC regulator IC KA7812 (IC01) normal? (11VDC-12.5VDC)(5) Is output voltage of DC regulator IC KA7805 (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 whenrun/stop 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 #62, #36:SH07/09/12YAB,SH09/12YAO(compressor), #60, #48:SH07/09/12YAB,SH09/12YAO(4 way valve) and #61, #37:SH07/09/12YAB,SH09/12YAO(outdoor fan) of the micom normal? 5VDCIs voltage of #63 (indoor fan) of the micom normal?Is voltage at #32 terminal of the Micom normal?0VDCIs voltage at #64 terminal of the Micom normal?5VDCIs rating voltage ±10% rangeapplied to theprimary side of the powertransformer?•Check linkage betweenpower cord andterminal tap•Check fuseIs 14~18VAC appear inthe secondary side ofthe power transformer?Replace powertransformerYESNO YESNOYESYESYESNOYESYESYESDC5V10ms20ms100nsNONOOKYESYESYESYESNONOYES NormalRefer to remote controlunit fault diagnosisReplace PCBmodule.Is output voltage of ICO2 normal?Check connectionscompressor 4-wayvalve, outdoor fanand indoor fan.Are voltages at RY71(Compressor)RY73(4-way valve) and SY72(outdoor fan)normal? DC12VIs voltage at SS71(indoor fan)ReplaceRY71, RY73,RY72 andSS71NONONOIs voltage output terminal ofD101~D105(IN4007) normal?Replace ICO2Check PCB pattern.Replace main PCB.Replace IN4007ReplacemicomIs voltage at #25 terminal of the micomnormal?Are voltage at #30 and #31 of themicom normal?NONO NOYESNONONOYESOKIs operation normal?Replace resonator (X501)