Question about Verge VGA285 Car Audio Amplifier

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One channel not working

Hi, i've bought from ebay one Verge VGA285 as is condition. one ofw the channels is working fine , the other not, when i adjusted the input level the non working channel started but it was like a protected mode because was working for 1 sec then off for 1sec and so long , i've opened the aplifier and i've switched between (left to right channel) the final transistors thinking that one of them if burned but they are fine , when i've tried again to see if it's working i've noticed that the final transistors on the side of the channel that is not working are overheating very fast...any ideea , any schematics for the amplifier? thank you

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Re: one channel not working

You should also make sure your RCA's are in proper working order you can test it by switching them (putting the right into the left channel and vise versa)

Posted on Jun 26, 2007

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Re: one channel not working

Could possible a bad bias resister. easy enough checked with a meter for ohm. also check around the circuit one the side that gets hot see if the transisters farther in are getting hot as well of if they seem out of range on a meter. One thing I have found is if you look carefully at an amplifier stage it is pretty bisymetrical. so use measurements from one side to compare to the other. Sometimes this will give clues.

Posted on Aug 04, 2006

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you need to determine what impedance the amp is running at ,how many spekers ,most 2 channel amps will only run 2 4 ohm subs per channel and only 1 4 ohm speaker in bridge ,Basically if you have 2 4 ohm speakers bridged at the amp it will usually cut in and out .Some amps will not do this for a while and will work for a while at low impedance but once they get older and hot and cool off many times they will then only work for the intended ohm load ,Do you have 2 speakers ,if so make sure 1 is on left channel and 1 is on 2nd channel (should not cut off ) if it is a mono amp ,make sure you are only running 2 4 ohm subs and not dvc speakers (these will run 1 ohm and shut the amp down ) there are ways of wiring more speakers or dvc speakers ,I can explain but I need to know what product you have .

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The sub woofer can be connected by bridging one side of the right channel to the other side of the left channel. Usually this will be marked on the speaker connection terminal and use will not have any trouble to locate. If not use the + ve of the right and the - ve of the left to connect to the sub woofer. turn it on and check . If you find the phase different- with less bass- reverse the connection and try. this will work fine. Good day

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How much?

Hello k_davis1004,

The Orion Cobalt 2105 XP is a relatively low-power 2-channel amp. I've seen it on eBay Express for as low as $25. How much it's worth depends not only on the condition but also the intended use. If you are the buyer, and really need a small 2-channel to power a set of normal speakers, I'd say buy it if you can get it for $25-50.

On the other hand, if you're the seller, don't expect a rush of buyers. There's just too many very good little 2-channel amps out there selling new for $100 or so. And with a new purchase, the buyer typically gets a manufacturer warranty, possibly return or exchange, and technical support if needed.

Orion makes good stuff. And their reviews from users is generally very positive.

Hope this helps.

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Have you tried swapping the RCA signal cable from a working channel to confirm that it's not a signal problem?

Have you swapped a speaker from a working channel to the dead channel to confirm that it's not a speaker problem?

It's unusual that one channel goes dead and the rest work.

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I recommend you swap your left and right input cables to make sure it's not a source issue.

So from your headunit, plug the left channel output into your amps right input and your right channel output into your amps left input.

If the same side is still not working then disconnect both (or single speaker if it bridged) the speakers from the not working side at the amp. Connect the front and then the rear speakers individually and retest to see if one of them works.

If one does work then check the cabling and speaker connections on the one that doesn't. If it's shorting out anywhere it will stop your amp from powering that channel.

Failing that, it could just be that your amp has partly failed.

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