take a break it's too close to Christmas...have a scotch with me if nothing but in spirit i wish you well...
Replaced R53 and R54 (and U3 while I was at it). Unfortunately, powering back on recooked R54. The 5V rail was ok when I checked it before, what else could be causing too much current to flow through R54? Maybe a bad U13? Should I remove R54 and recheck the 5V rail? See second picture below for relevant area of schematic; see post #2 for full schematic.
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All the electrolytics LOOK ok, but I don't have an ESR meter to check them. Is there anything else I can do to evaluate if they are still good? Should I just replace them all?
Removed and checked C20. Capacitance reading was ok, but resistance values were a bit wonky so I replaced it. Replaced the cooked R54 as well.
Is there a smarter way to power up this board to see if I have an issue, or is it more a flip-and-pray process?
Is there a smarter way to power up this board to see if I have an issue, or is it more a flip-and-pray process?
Replacing C20 did the trick! The amp works fine now. It even survived me running it for a few minutes with the speaker cable not fully plugged in (whoops!).
I also added some heatsinks on the voltage regulators and DSP chip to help ease the overheating issues common to these amps.
Thanks all for your help, and happy new year!
I also added some heatsinks on the voltage regulators and DSP chip to help ease the overheating issues common to these amps.
Thanks all for your help, and happy new year!
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Just found this thread - helping a friend troubleshoot his SV 212.
For those interested, a Rumble video from Electronic Investigation shows the troubleshooting/repair of this problem.
https://rumble.com/vl36fe-line-6-spider-valve-112-troubleshooting-and-repair-ep-003.html?start=875
Starts at the point of diagnosis and repair, but feel free to view all for the troubleshooting plot with all the suspense and intrigue. 😉
For those interested, a Rumble video from Electronic Investigation shows the troubleshooting/repair of this problem.
https://rumble.com/vl36fe-line-6-spider-valve-112-troubleshooting-and-repair-ep-003.html?start=875
Starts at the point of diagnosis and repair, but feel free to view all for the troubleshooting plot with all the suspense and intrigue. 😉
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