I have the same problem with * Kalervo Karppinen* (I have Technics stero system SC-CA 1080 and it has worked fine many years untill now.Device shuts off after little more volume and error code F61 appears for few seconds.I power system on again and turn little bit more volume, same result again. Fan does work simultaneously with bass (not with how hot heat element is, strange solution).I have checked transistors, diodes and weldings, do I have to change expensive audio power module RSM 3403? With low wolume it works just fine, only moderate/hard volume gets out these symptons ) Thanks for any answer NIKOS

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