the soundgate saga, semi-over
armanmik at n-jcenter.com
Tue Feb 5 10:18:33 EST 2002
>To: 200q20v at audifans.com
>From: Brett Dikeman <brett at cloud9.net>
>Subject: the soundgate saga, semi-over
>Cc: quattro at audifans.com
>Adventures in I-Just-Want-To-Play-Some-#$@%!-CDs-Land, part IV: The Revenge.
>Turns out that the rear driver's side speaker is shot. No prob, I
>think. I'll just pop that bad boy open, replace the caps, and I'll
>I pull the potting compound off the board(there's a ton of it on this
>particular board), replace all the capacitors, and put everything
>back together and in the car.
>Turn on the radio, listen for about 10 minutes...problem starts happening.
>So this time, I turn the volume almost all the way down and endure
>the various odd noises, which curiously quiet down after a few
>seconds. Hmm. I then go around to each speaker and listen carefully
>to what it is doing.
>The driver's side rear unit is cutting in and out and then starts
>making bop! bop! bop! bop! noises. Shoot.
This is called "motorboating" and indicates a power supply problem, usually
an open filter capacitor.
Go back and check your work, make sure all the grounds are connected, and
nothing else has come off the PC board.
>So, at this point, I'm stuck; I have no idea what's wrong with the
>rear unit, since I replaced all the electrolytic capacitors, just
>like I did on the front units, and they seem to be just fine.
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