poesco Posted February 17, 2016 Share Posted February 17, 2016 I get no output from either the digital or 1/4" connections. Upon opening the plate on the back of guitar I noticed a burn spot on the foil of the plate. Looking closely at the circuit board, I noticed what looks like a burned chip. Attached are a few photos. What is the best way to repair this guitar? Would I be able purchase a loaded board to swap out the bad board? Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 18, 2016 Share Posted February 18, 2016 Let me guess,.... 700 Electric? You leave the batteries in while using the XPS power wedge? Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 18, 2016 Share Posted February 18, 2016 I would send it to Line6 for repair. Quote Link to comment Share on other sites More sharing options...
poesco Posted February 18, 2016 Author Share Posted February 18, 2016 I've never used the XPS power wedge. Quote Link to comment Share on other sites More sharing options...
poesco Posted February 18, 2016 Author Share Posted February 18, 2016 700 electric, I've never used the XPS power wedge.. First I noticed the digital output stopped working through my HD500. I suspected the cable went bad so I continued using the 1/4" output (batteries). A few weeks later the 1/4" output stopped working. That's when I opened the back and noticed the burn. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 18, 2016 Share Posted February 18, 2016 Were the batteries in the 700 when you plugged with the VDI? It was a VDI and not a generic CAT5 was it? Quote Link to comment Share on other sites More sharing options...
poesco Posted February 18, 2016 Author Share Posted February 18, 2016 I've used the digital cable several times times with the batteries installed and never had a problem. I use a Line 6 RJ45 cable, never a generic. Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 18, 2016 Share Posted February 18, 2016 The thing that I know of that blows that component is touching the battery to the connector backwards. Easy to do when replacing the battery. You will have to have that component replaced. (or do it yourself) Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 18, 2016 Share Posted February 18, 2016 "I've used the digital cable several times times with the batteries installed and never had a problem"--- It was something we always warned people not to do, back in the day when we made these (before I got here). May be something in the Knowledge Base or some other corner of the Forum. Been a while since I saw it. I've posted here on the Forum about this a few times in the past. Power coming in thru one side of the circuit from the power wedge or floor effects, and power trying to come into the circuit from the other way, can and does put stress on that very spot of the circuit in the photo. It's an over-voltage build-up that stresses that corner of the circuit. Either battery, or XPS power wedge, or VDI,.... but never a combination of them together. I've posted on this a few times in the past. You might get away with leaving batteries in while connected to VDI, with a JTV or the new Variax Standard, but I even do the 'one or the other' with JTV's and Standard's simply out of habit now. Just got into the habit of doing it that way,... one or the other, not both. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 18, 2016 Share Posted February 18, 2016 That too, what Charlie said,.... though I've never done that myself, I've heard of it happening. Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 18, 2016 Share Posted February 18, 2016 It blows the diode if you touch the battery on backwards. This happened a lot to early Variax users. The clips only clip on one way but they touch the wrong way too and if you are not looking, it's easy to try to connect it the wrong way. I am very careful with my 500 when changing the battery pack. By the way, I always run the VDI with the pack installed and I have never had a problem with it. Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 18, 2016 Share Posted February 18, 2016 Uh,... lucky Charlie. Usually blows when you try to get current to go both ways thru the sane diode. Quote Link to comment Share on other sites More sharing options...
poesco Posted February 19, 2016 Author Share Posted February 19, 2016 Ok, touching the battery to the connector backwards may have been the cause of the burnt diode. Anybody know where I can get a hold of the diode or a replacement board. Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 19, 2016 Share Posted February 19, 2016 If it were me I would order a new diode from Digikey and solder it in. Quote Link to comment Share on other sites More sharing options...
poesco Posted February 19, 2016 Author Share Posted February 19, 2016 How do I know what size diode to order? Quote Link to comment Share on other sites More sharing options...
psarkissian Posted February 19, 2016 Share Posted February 19, 2016 Need a capacitor as well, the one on there is gone. And it's not the same as the other diode there (D5). That burn spot looks like it may have damaged a trace underneath. As for the diode,... the guitar will need to be taken into an authorized service center. Maybe the board can be repaired there. There is some specialty things to do to it that an authorize tech will have to deal with (or at Line 6). Maybe it's fixable, it's an older product, discontinued several years ago. Quote Link to comment Share on other sites More sharing options...
poesco Posted February 20, 2016 Author Share Posted February 20, 2016 Is the board in the 700 the same as the board in the 300? Quote Link to comment Share on other sites More sharing options...
clay-man Posted February 20, 2016 Share Posted February 20, 2016 Oh jeez Quote Link to comment Share on other sites More sharing options...
Charlie_Watt Posted February 20, 2016 Share Posted February 20, 2016 I do not think the 700 and 300 have the same board. The 700 board is much like the 500. You can get yours fixed. Try a Variax repair center. Quote Link to comment Share on other sites More sharing options...
clay-man Posted February 21, 2016 Share Posted February 21, 2016 500 and 700 are the same/alike 300 and 600 are the same/alike 300/600 use the coffin casing. 500/700 don't use the coffin casing. Quote Link to comment Share on other sites More sharing options...
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