Question about Audio Players & Recorders
a great piece of instrument i may say.
the humming is usually cause by a loose connection on the input that causes ground, which as an output causes the humming sound.
The d-172 is digital, but tone generation uses analogue.so this will provide you limited areas to check. if you have the instrument opened, you may want to carefully vacuum clean it and have the lines checked starting from the on/off circuit to the tone generators.
as far as diagram goes. this instrument was released in 1981, and the repair manual is a little expensive but if you have one, you can refer to is on what is the best way to check a loose line in the instrument.
good luck, i sure hope you get this one running. (and post some pictures of it :) )
thank you for using fixya.
Posted on Apr 20, 2009
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Posted on Jan 02, 2017
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