I recently purchased this item, you can read the original post here: AIWA Personal Radio Cassette Player HS-TX406
I love this little unit, it has a great radio reception probably better than a number of Sony Walkmans I have worked on to be honest. It has arrived in good cosmetic condition with only a few dinks and scratches commensurate with its 30 year plus age.
On opening up the unit it’s patently obvious that this is another drive belt issue, it’s saggy and breaks on removal. Luckily I have a replacement belt that I purchased earlier.
And that is basically it. No major dramas it’s as simple as replacing the belt.
A bit of light grease on the gears, a tweak of the speed adjustment and all sounds as it should.
I’ve used a calibration tape with a 3Khz sine wave, it’s tuned in pretty close to the tone and I’ve used a downloaded oscillator software package to check the matching. It’s not a professional setup but it’s fine for my requirements.
Sorry there is nothing else much to write but I have a good working unit that plays tapes well and all I can say is I’ve saved yet another easily repairable unit from landfill. I already have someone who wants to take this one off my hands so I hope it will have many more years of trouble free operation.
Jobs a good ‘un 👍
Foxes Den 
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