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Sony MU-D100 cassette deck

I got a Sony MU-D100 cassette deck. Before push playback, the casptan drives too fast (hum loudly), Playback also too fast and hum loudly. What's the problem? I need a service manual for Sony MU-D100 cassette deck, Thanks!



Help! Need Sony MU-D100 cassette deck service manual, Thanks!

I got a Sony MU-D100 cassette deck. Before push playback, the casptan drives too fast high speed (hum loudly), Playback also too fast and hum loudly. How to fix it. I need a service manual for Sony MU-D100 cassette deck, Thanks!