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Lasonic 931 hums loud when powered on


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#1 decks&cassettes

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Posted 07 October 2017 - 03:05 PM

My lasonic 931 has a loud hum when powered on and same humm when not powered on but you hit play on the cassette
Could it be a grounding issue ? It can be heard through the music

#2 JVC Floyd

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Posted 07 October 2017 - 04:52 PM

Try pressing record and play at the same time then press stop. Repeat this step about 10 times then check it , also flip the ac/ DC switch a few times.

#3 Transistorized

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Posted 07 October 2017 - 08:40 PM

Also try with DC power versus AC power. Could be your filter capacitors drying out in the PS