hifi engine

SU V 620 amplifier

Hi. As soon as I up the volume above around halfway the operation led goes off and I hear a click sound and the speakers is dead. I have then to lower the volume and reset and all fine again.
I tried everything - even disconnecting all wires and leaving only the supply cable. Same happen.
How can I fix it?



SU V 620 amplifier

I assume you have a Technics SU-V620. There is no bias adjustment for the amplifier, so that is not the problem. If it is going into protect mode even with speakers disconnected then I would say that either the audio output module is bad, or you have a power supply problem.

SU V 620 amplifier

measure the voltage ont the slider off the volume control, or the main-amp IN.
If there is DC voltage on the input the main-amp wil go in to protection. This due to a bad elco. (mostly the case).

SU V 620 amplifier

Thanks. I`ll try to replace that module if I can find it. Supply is perfect.