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In Reply to: Here we go again . . . Pioneer SX 850 Tech Problem posted by backtobethel on December 30, 2003 at 09:25:37:
Have you checked the DC Voltage levels at the output? If not, then I'd suggest that you read EchoWars' excellent thread at AudioKarma...could be nothing more than output bias needs a little trim adjustment.
Cheers,PBG
Follow Ups:
Okay, say I test for DC output and it is way too high. What then? I'm not exactly up on all the techno-jargon . . . I'm a novice, but would like to learn and am not afraid of jumping in. Thanks for your help.
Well, yessir is right - you can adjust the trim pots to get the DC levels down to a few mV, but only if you feel like you have a basic confidence in doing a little electrical work. It really isn't hard at all, especially if you have a service manual for the receiver. If this is a keeper, a receiver that you really enjoy, I'd highly recommend getting a copy of a service manual for it - they are available via ebay, www.stereomanuals.com, etc., for about $20 or less. You might even be able to get a copy of the page from the manual showing where the trim pots are from one of the folks here or at AudioKarma. (sorry, but I don't have that service manual myself)Read all the way through the thread on DC offset at AudioKarma - its a great primer on how to get that DC offset under control, and improve the sound to boot. Even if this isn't the source of your current problem, I'd suggest doing it after you get the SX-850 back working again. But that's just me - I am an engineer, and have to tinker with stuff all the time anyways.
Cheers,
Adjust the trim pots. Make SLIGHT turns and see how this adjusts DC. This is really about adjusting DCoffset on the output transistors and you should take a reading off of the 'sistors themselves.My advice; don't mess with that stuff unless you're really confident of what you're doing. Good way to get zapped or fry components. I'll bet it's the relay anyway.
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