Lanzar vibe 430 intermittent channel - diyAudio
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Old 17th April 2007, 04:06 PM   #1
n2audio is offline n2audio  United States
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Join Date: Apr 2007
Default Lanzar vibe 430 intermittent channel

I have an older Lanzar Vibe 430. When it works, it works fine, but about 1/2 the time, when it powers up one channel does not energize. No sound at all.
Sometimes after a few minutes it will turn on on its own, if not I can I can smack the top of the amp chassis a few times which will get it working properly. Once it powers up it works fine until the amp is powered back down.

It has had this problem for close to 2 yrs now.

Any guesses as to what's going on.
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Old 17th April 2007, 04:20 PM   #2
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Join Date: Oct 2002
Location: Winnipeg MB Canada
This is normal operation for a Lanzar amplifier.
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Old 17th April 2007, 06:18 PM   #3
n2audio is offline n2audio  United States
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what problems have you had with them?

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Old 18th April 2007, 04:40 AM   #4
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Join Date: Mar 2007
These amps are famous for bad solder joints. The first place I would look is on the inductor just beyond the fuses. The second place would be the Rectifier diodes.
If it ain't broke Don't fix it
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Old 18th April 2007, 06:22 AM   #5
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Join Date: Nov 2003
Location: Louisiana
Check the switches for intermittant connections. If you can move them slightly and the channels cut in/out, try cleaning them. Do the same with the potentiometers.

If that doesn't work, try pushing on the main board and the preamp board. If pushing on one causes the signal to cut in/out, it will narrow down the problem.

If there's a pluggable jumper between the boards, remove/replace the connector. Sometimes the contacts get oxidized. If you pull the boards, check the solder connections on each end of the jumper.
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Old 22nd August 2007, 05:04 AM   #6
n2audio is offline n2audio  United States
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Join Date: Apr 2007
It's been forever, but I finally had convenient access to do a check.
The amp's been acting up a lot lately. The majority of the time.
Wouldn't you know it - when I got the cover off an powered it up it was working fine. I touched/tapped/moved all the switches, x/o and gain dials. No problems. Wiggled and removed both preamp/amp jumper wires, no problem and no visible corrosion. Wiggled rca's, wiggled all the caps, both transformers, all the ic chips.
None of the solders are visible w/o pulling the board and I didn't want to take the time to do that tonight. I guess that will be the next step.
I'm sure though, this weekend when I take off on my 600 mi road trip, it will be short a channel the whole way
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