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ash4kel 27th March 2011 07:18 AM

Orion Cobalt 304, 1 channel not working
This amp has been in service for a couple years in my vehicle and was previously owned and in service. Recently the right front speaker volume was oscillating a little and had some static. Now that channel is not working at all. This is a 4 channel amp. Thanks, Scott

ash4kel 27th March 2011 08:21 AM

What should I check?

Perry Babin 27th March 2011 10:46 PM

When there is intermittent audio or static, the first thing you should do is to operate all controls through their entire range while listening to the defective channel to see if it ever produces clean audio.

ash4kel 28th March 2011 06:25 AM

There is no sound at all at this point. I went through the entire range and cannot get it to produce sound anymore. This was in my wifes car and neglected to tell me when it started crackling. I think it's probably been doing it for awhile so now it seems as if it's finally failed completely. What should I check next? Thanks

Perry Babin 28th March 2011 12:27 PM

Post a photo of the inside of the amp.

ash4kel 29th March 2011 08:27 PM

3 Attachment(s)
Attachment 216319

Attachment 216320

Attachment 216321

Here is some pics of the inside.

Perry Babin 29th March 2011 08:35 PM

Find the pin on U5/U6 that has signal on it when you drive a signal into the dead channel. If you can't find one for that channel. Drive signals into the other channels and find their signals. You're looking for signal on pins 3 and 5.

ash4kel 29th March 2011 08:52 PM

So i am showing my ignorance again, I m not sure how the pins count. Which pin has the square pad?

ash4kel 29th March 2011 08:54 PM

And what kind of signal am I looking for with my volt ohm meter.

Perry Babin 29th March 2011 08:56 PM

AC voltage. Drive the input with a strong signal, set the crossovers to flat and max the gains out. Place the black meter probe on one of the non-bridging speaker terminals.

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