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Vetta Ii Combo - Left Speaker Does Not Work

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#1 bgely

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Posted 24 September 2013 - 06:55 AM

I have a Line 6 Vetta II Combo.  I found that my left internal speaker is not working.  I can swap the wiring between the right / left speaker and the problem moves so it is not the speaker.  I don't know of any amp setting that turns on or off just one speaker at a time.  Has anyone ever had this occur or does anyone have any suggestions. 


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#2 DickFoster

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Posted 24 September 2013 - 11:21 AM

I have a Line 6 Vetta II Combo.  I found that my left internal speaker is not working.  I can swap the wiring between the right / left speaker and the problem moves so it is not the speaker.  I don't know of any amp setting that turns on or off just one speaker at a time.  Has anyone ever had this occur or does anyone have any suggestions. 

Yes indeed there are switch setting to turn each channel on and off separately. Have you gone though the manual i.e. the pilots handbook. It's worthwhile if you haven't yet.


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#3 bgely

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Posted 24 September 2013 - 12:57 PM

I am familiar with the Pilot Manual.  When you say each channel are you referring to the 2 amps and the ability to use one or both?  I found that both speakers are actually working but the left is at a much lower volume than the right speaker.  If I select the same channel for Amp 1 (left speaker) and Amp 2 (right speaker) and then adjust the amp volumes independently, to get the same volume levels Amp1 would be set on max volume and Amp 2 set on about 30% volume.  For example:  Amp 1 Identical Twins volume at 100% (left speaker) and Amp 2 identical Twins volume at 40% (right speaker).  If I use 100% on both Amp 1 and Amp 2, Amp 2 is so much lower that it actually appears Amp 1 is not working.  Appears I may have Amp problems on 1.  Any thoughts or further test ideas?


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#4 DickFoster

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Posted 30 September 2013 - 11:56 AM

I am familiar with the Pilot Manual.  When you say each channel are you referring to the 2 amps and the ability to use one or both?  I found that both speakers are actually working but the left is at a much lower volume than the right speaker.  If I select the same channel for Amp 1 (left speaker) and Amp 2 (right speaker) and then adjust the amp volumes independently, to get the same volume levels Amp1 would be set on max volume and Amp 2 set on about 30% volume.  For example:  Amp 1 Identical Twins volume at 100% (left speaker) and Amp 2 identical Twins volume at 40% (right speaker).  If I use 100% on both Amp 1 and Amp 2, Amp 2 is so much lower that it actually appears Amp 1 is not working.  Appears I may have Amp problems on 1.  Any thoughts or further test ideas?

Now that we know it's not totally dead that leaves either a patch problem or perhaps an analog hardware problem. I assume you're trying to setup different patches. The pot are all digital so it's probably not that. How are you at working on electronics? If not yourself do you know anyone who is good at that sort of thing. If so I the service manual can be had, then it should be a fairly simple job to fix it and put things right again.


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#5 bgely

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Posted 30 September 2013 - 03:49 PM

Thanks for the reply.  I am an Electrical Engineer so repairing electronics is typically not a problem.  I found a Vetta Service Manual online and while it is similar to the Vetta II, there are some differences.  I suspect the problem is on the Power Amp PCB (also speaker output on this card).  The Power Amp card in my Vetta II has the same part number as the Vetta schematic for that same PCB, however comparing the schematic to the board, there are some differences.  I am trying to locate an O-scope so that I compare signals between the 2 amps.  Maybe I can isolate the components that are causing the problem. 


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#6 DickFoster

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Posted 02 October 2013 - 10:13 AM

You shouldn't have much trouble fixing it then. Too bad you're not close by or you could borrow one of mine. I have a  Tek T922 I don't really need now but am keeping it mostly for a backup. Being scopeless is almost like being naked. Lucky for me we have a good electronics fleamarket out here where I was able to score some good deals on a couple of used scopes. Not the lastest and greatest digtal storage but I got a real nice Tek 2445B for a hundred bucks. There was nothing wrong with it either. Let us know what you find. I'd take a look at some to the A-D, D-A converters too. There are a couple in a couple of places in the circuit,   

 

 

Thanks for the reply.  I am an Electrical Engineer so repairing electronics is typically not a problem.  I found a Vetta Service Manual online and while it is similar to the Vetta II, there are some differences.  I suspect the problem is on the Power Amp PCB (also speaker output on this card).  The Power Amp card in my Vetta II has the same part number as the Vetta schematic for that same PCB, however comparing the schematic to the board, there are some differences.  I am trying to locate an O-scope so that I compare signals between the 2 amps.  Maybe I can isolate the components that are causing the problem. 


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