Technics KN550 muting

[Tom41]

I have recently discovered my old Technics KN550 synth that I used to play on back in the 1990s. I powered it up and it still works, with one minor issue - the speakers don't make any sound! I can hear the output through the headphone jack, and while inserting and removing the headphones sometimes one of the speakers will crackle and turn on momentarily.

I suspect this is an issue with the cutoff circuit that mutes the speakers when you plug in headphones; it's activating even when there are no headphones plugged in! Hopefully this would be an easy fix - any advice?

[Andrew F. Ali]

Re: Technics KN550 muting

The Headphones Jack needs replacing. The audio Output is working since you can hear thru the phones. Start with the easy thing--Replace the headphones jack.

[madan1]

Re: Technics KN550 muting

Try spraying some contact cleaner in the audio jack. Wait to dry out before powering up the unit.