...to remove a shield to remove the back amplifier power supply area. The power supply is a switching type and has lethal voltages present. Working on this should be done using an isolation
type. Powered off immediately upon buzzing. End of testing. Can you help? My vocabulary of these parts is lacking so please be descriptive... diagrams/pics/arrows? Thank you. NEVER increase or replace
...schematic, but the PA500 uses a power chip part number TPA3100D2 which drives the speakers. ( That is all it really does other than mute the speakers) IF you open your unit and find a chip with this ...
...reducing the BASS a bit will often alleviate some of the problem. This is basically the same type of feedback heard when a microphone is turned up too loudly or the mic is pointed at the PA ...
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