To test,;
Set SPKRS+PH to yes, if audio comes back, then headphones are plugged
in, OR the switch in the front or rear phones socket is bad and telling
the brain a plug in in.
If setting SPKRS+PH to yes and still no audio, try tapping 1 while in
that menu to toggle the sensing between early (+) or later boards
(-)that had reverse polarity.
If still no audio (in speakers only), then probably a bad audio chip U1
on DSP board.
(or if you had the front panel off recently, the two dual-row plugs from
the DSP board to RF board may be UP one row of pins).
Keith WE6R
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