Orion Cobalt 304, 1 channel not working - diyAudio
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Old 27th March 2011, 06:18 AM   #1
ash4kel is offline ash4kel  United States
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Default 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
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Old 27th March 2011, 07:21 AM   #2
ash4kel is offline ash4kel  United States
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What should I check?
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Old 27th March 2011, 09:46 PM   #3
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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.
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Old 28th March 2011, 05:25 AM   #4
ash4kel is offline ash4kel  United States
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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
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Old 28th March 2011, 11:27 AM   #5
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Post a photo of the inside of the amp.
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Old 29th March 2011, 07:27 PM   #6
ash4kel is offline ash4kel  United States
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100_3248.jpg

100_3249.jpg

100_3250.jpg

Here is some pics of the inside.
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Old 29th March 2011, 07:35 PM   #7
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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.
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Old 29th March 2011, 07:52 PM   #8
ash4kel is offline ash4kel  United States
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So i am showing my ignorance again, I m not sure how the pins count. Which pin has the square pad?
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Old 29th March 2011, 07:54 PM   #9
ash4kel is offline ash4kel  United States
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And what kind of signal am I looking for with my volt ohm meter.
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Old 29th March 2011, 07:56 PM   #10
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http://datasheet.octopart.com/NJM456...eet-135003.pdf

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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