Uniden TRU-8885. Great 5.8gig phone system, but I noticed after two years or so, the ringer volume on the handsets was starting to degrade. One handset, so low I could barely hear it. Fearing the driver for the speaker was failing, or that I had dropped it one too many times, I dissassembled the handset to test. Hmmm; mylar 1" dia speaker with a tiny potted board where the two wires connect. With nothing to loose, I connected a 2" PC speaker to the board. Sound! Loud! In fooling with the mylar speaker, I noticed if I touched the plastic film covering the face, the volume increased slightly. I pried up on the film slightly with and Xacto blade tip, and the speaker came on, sounding halfway normal now. Repair: I poked a hole into the film covering, and stuck a 1/2" piece of round toothpick between the film and speaker face. The volume returned to normal, if a little buzzy. Better than nothing. I do so love being handy....:) JR Dweller in the cellar
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