Orion Cobalt 304, 1 channel not working

ash4kel · 27th March 2011, 06:18 AM

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, 07:21 AM

What should I check?

Perry Babin · 27th March 2011, 09:46 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, 05:25 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, 11:27 AM

Post a photo of the inside of the amp.

ash4kel · 29th March 2011, 07:27 PM

100_3248.jpg

100_3249.jpg

100_3250.jpg

Here is some pics of the inside.

Perry Babin · 29th March 2011, 07:35 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, 07:52 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, 07:54 PM

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

Perry Babin · 29th March 2011, 07:56 PM

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.

27th March 2011, 06:18 AM	#1
ash4kel diyAudio Member Join Date: Mar 2011	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

27th March 2011, 09:46 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

28th March 2011, 11:27 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Post a photo of the inside of the amp. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th March 2011, 07:35 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th March 2011, 07:56 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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27th March 2011, 07:21 AM	#2
ash4kel diyAudio Member Join Date: Mar 2011	What should I check?

28th March 2011, 05:25 AM	#4
ash4kel diyAudio Member Join Date: Mar 2011	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

29th March 2011, 07:27 PM	#6
ash4kel diyAudio Member Join Date: Mar 2011	100_3248.jpg 100_3249.jpg 100_3250.jpg Here is some pics of the inside.

29th March 2011, 07:52 PM	#8
ash4kel diyAudio Member Join Date: Mar 2011	So i am showing my ignorance again, I m not sure how the pins count. Which pin has the square pad?

29th March 2011, 07:54 PM	#9
ash4kel diyAudio Member Join Date: Mar 2011	And what kind of signal am I looking for with my volt ohm meter.

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