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Help: Rotel RB990BX Buzz/Hum
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<blockquote data-quote="Rotelman" data-source="post: 794130" data-attributes="member: 19028"><p>BoerieZA, I'll be keen on your "Semi working" RB990BX, but I'm sure you'll be able to sort it out and avoid the sale.</p><p></p><p>Are you using shielded RCA cable to connect from your AV receiver to your power amp ? If yes, ignore, if not, try a shielded cable.</p><p></p><p>If I was you, before I would do anything else, I would open her up and make sure ALL the connections internally are sound. This goes from the fuse clamps all the way to the little fixtures holding down the mainboard and ancillary boards. Undo and re-do all ribbon wire connectors. Check that all screws are present and tightened, all over, even heatsinks. Check for loose screws rolling around somewhere and check for some soldering splatter or flux.</p><p></p><p>Check with your multimeter in areas where you have a concern prior to touching. Testicles not required, but 6 beers and some good tunes in the background helps...</p><p></p><p></p><p>Once you're sure all is in order, then proceed with your proposed steps. </p><p></p><p>On the grounding wire one, this is a good start. Once in place, make sure to check if for any potential difference, there could be stray current going to earth via this which could liven up your chassis.</p></blockquote><p></p>
[QUOTE="Rotelman, post: 794130, member: 19028"] BoerieZA, I'll be keen on your "Semi working" RB990BX, but I'm sure you'll be able to sort it out and avoid the sale. Are you using shielded RCA cable to connect from your AV receiver to your power amp ? If yes, ignore, if not, try a shielded cable. If I was you, before I would do anything else, I would open her up and make sure ALL the connections internally are sound. This goes from the fuse clamps all the way to the little fixtures holding down the mainboard and ancillary boards. Undo and re-do all ribbon wire connectors. Check that all screws are present and tightened, all over, even heatsinks. Check for loose screws rolling around somewhere and check for some soldering splatter or flux. Check with your multimeter in areas where you have a concern prior to touching. Testicles not required, but 6 beers and some good tunes in the background helps... Once you're sure all is in order, then proceed with your proposed steps. On the grounding wire one, this is a good start. Once in place, make sure to check if for any potential difference, there could be stray current going to earth via this which could liven up your chassis. [/QUOTE]
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