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RE: Pioneer SX-727 is driving me nuts!

Ed, if you've already cleaned the switches, and the sound sometimes returns or the crackle diminishes when the volume is turned up, then I'd say a dirty relay is a strong possibility. When you remove the four screws holding the black perforated sheet metal cage from the top of the output transistors, near dead center in the chassis will be the relay. It should be a box-shaped component roughly an inch square and an inch and a half tall. The cover will be transparent and facing front to back, it'll look like it contains a small black drum with four thin metal strips on the right and the contacts at the bottom. It's the only largish component on the top of the chassis in the middle just to the front right of the most forward large black filter cap. The set of contacts that are important to clean are those on the inside, not the outside.

Good luck,
- JP


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