[qiqitori]

> Aiwa Cassette deck won't play any cassette

If you're interested in fixing this: it sounds like power comes on. So maybe the drive belt has disintegrated? Recently replaced a belt on a thing from the late 1970s. The belt was no longer elastic, which means it had snapped, and you could "cut" it some more by merely touching it. On Amazon you should be able to find packs of cassette rubber belts, and one or more of them will probably fit.

If/After the movement seems all right, try cleaning the heads with IPA (try pressing play without anything inserted and then clean the bits of metal that come out, as well as the capstan and pinch roller). There may be other things wrong with it (motor speed, head azimuth (angle)).

[totetsu]

I recently tried to replace the belt on a mini perl cassette recorder. The shape of the belt wasn't round, it was a semicircle on the outer side and a wedge shape on the inner. How does one even Google that XD

[djantje]

"v belt cassette recorder" Duckduckgo gave me a gem: cassettedrivebelts.com

[cseleborg]

> try cleaning the heads with IPA

I've had mixed results with cleaning heads with IPA. My head often seems very sluggish the next morning, and other people with whom I spend such evenings have reported similar results with their heads.