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Loose RCA Jacks?

post #1 of 8
Thread Starter 
This isnt _quite_ a headfi type of question, but i figured you guys are such experts on building headphones amps, you might be able to help me out.


I've got this Yamaha preamp, CX-800U, but the pre-out RCA jack is going a little haywire; sometimes the left channel cuts out completely, which is easly solved by giggling the left rca preout... obviously the problem is with the rca preouts. I've taken it apart and looked at the preouts, but I'm not really experienced in repairing them, and nothing seems to be the obvious culprit.

Any suggestions on an easy way to fix the sound from dropping out, short of replacing the preouts?
post #2 of 8
are the RCA jacks soldered to a board or are they mounted on the chassis?

It's probably a broken solder joint.
post #3 of 8
Have you try cleaning the jack? The rca plug on the interconnect?
post #4 of 8
Thread Starter 
Quote:
Originally posted by antness
are the RCA jacks soldered to a board or are they mounted on the chassis?

It's probably a broken solder joint.
They're mounted on the chassis, on this little plastic deal... i originally figured it would need a little more solder, but it doesnt seem like that to me?

I'm about to tear the amp apart right now, so i'll take some photos while i have it apart.
post #5 of 8
Thread Starter 
Quote:
Originally posted by puppyslugg
Have you try cleaning the jack? The rca plug on the interconnect?
I've taken a look at the jack, it seems pretty clean, and the interconnects i've changed to a completely different pair.
post #6 of 8
I guarantee you it's the solder joint, if the jacks are mounted onto a board, which is the case with pretty much all but the most expensive audio equipment, years of stress of plugging/unplugging cables causes the jack to bend back and forth on the board leading to cracks in the solder or the thin copper traces on the board.
post #7 of 8
Thread Starter 
I think you're right... after having it apart and snapping a few photos, nothing seems wrong with the connects, i think it must be on the board. I'm not gonna touch that, I'll probably just take it into a shop.
post #8 of 8
Thread Starter 
oh, and thanks for the help, btw.
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