hifi engine

SX-780 bought on ebay as "tested" - very low volume output

I just received a pioneer SX-780 from a seller on ebay. Seller said everything works but it does not. I did not pay a lot and don't want to bother with shipping it back if the problem can be fixed easily. I just downloaded the service manual and I am ready to work on it. Here are the symptoms: Both VU meter bulbs are out - and meters do not move. the sound is extremely low but audible through headphones or speakers. All inputs - tuner, phono or aux. I can hear the relay clicking in after a few seconds of powering up.

I am new to forum - hoping for some guidance on where to start. I really love the look and sound of the Pioneer Silver Series and hope to learn more about them. My first lesson: don't buy on ebay.



karodimitrov's picture

Re: SX-780 bought on ebay as "tested" - very low volume output

Hi.When I started to repair something begin on two things.First-check the fuses,and second-power supply and volages оn all points of diagram.Where there is a discrepancy-around there is the problem.

AVM Sir Rodney Pentode's picture

Re: SX-780 bought on ebay as "tested" - very low volume output

Possible..... but unlikely as both seem to have failed together. would like further infomation!

karodimitrov's picture

Re: SX-780 bought on ebay as "tested" - very low volume output

And possible both STK are gone...