Sony tc-k75 help needed

Hello all,
My name is Dimitar and I'm new it the forum. A few weeks ago I bought Sony TC K75 cassette deck . It was not working, but I was able to change the belts and the old grease. There was another problem with the record button which I managed to fix. The deck worked perfectly until a few days ago when it stopped playing sound. There are times when it works for a few seconds and then no sound again. I made two videos so you guys can get an idea of what the problem might be.I'll be really grateful if someone can help me.Thanks in advance:cheers:
It was resistor on the 14v rail. The deck is up and running again


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