Hello everyone!

I must say that I am not a collector of these wonderful little thing, I'm just a musician who likes good sound. 20 years ago I bought Aiwa hs-px 1000, used 2 years. Walkman was 100% correct, and now after trying to switch it on it starts for a second and then turns itself off. Does anyone have any idea what could be, maybe belt?

Thank you experts!

It is the belt. I had the same problem with mine. Would attempt to spin up, then power off. Replaced the belt also whilst doing so, replaced the capacitors too.

Thank you both for your prompt response!
In any case, I have to open it and check the capacitors and belt.
Although I have experts for this operation, I will certainly have more questions...
here are the high level experts for walkmans ...

Checking whether the belt is intact will be easy, as it will be a simple visual inspection. Replacing it won't be so, if it isn't intact. It should really only be tackled by someone experienced with handling a soldering iron, as there are some tricky parts that can be easily damaged inside. Whilst you are replacing the belt, it is worth checking/replacing the electrolytic capacitors too, as mentioned already they are prone to failure.