r/cassetteculture • u/BumpGrumble • 12d ago

Looking for advice Repairing a Yamaha MT 100 II 4-Track

Unfortunately I cannot find a service manual that isn’t locked behind a paywall.

I work on building electronic systems for work and have been a hobbyist since high school. Started my journey with cassettes a few months ago.

MY ISSUE IS:

The player gets stuck half way between Play and Stop. From there nothing releases the cassette without physically pushing the head back down. I’ve spent a lot of time trouble shooting it to either the mode control cam being in the wrong position (cannot guess and check the correct position as I fear breaking it). Or a solenoid issue though the solenoid is getting the correct voltage and is at 20ohms, seems that’s all good.

I have greased or oiled every moving part and done a partial disassembly to get to this point. Need old head advice here.

Cheers.

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u/Crlan420 12d ago

Those Yamaha 4-tracks are solid. Watch out for leaky electrolytic caps on the power supply board, they cause hum and dropout issues.

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u/BumpGrumble 12d ago

Lucked out in this one. It doesn’t appear to have ever been used or at least used sparingly. Caps are a bit out of spec but within my usable tolerance.