Re: non working internal speaker

Hello 780 users,

   Your lack of speaker audio may be the result of a damaged jack.  The miniature phone plug left in the jack for a long duration may have caused the metal parts inside the jack to lose their springiness, and that may keep the metal contacts from touching each other to complete the circuit to the internal speaker when the plug is removed.    You would need to do a careful visual inspection, possibly with a magnifying glass, and use a battery-operated DVM, VOM and other devices to check the signals and continuity of the wiring and the jack.

  Good luck.    thanks to all the longtime, faithful 780 hobbyists for all of the helpful info posted here.


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