Line 6 Spider Valve 112 Schematic

[Cheeto333]

Removed R54 and R53 (both were shorted). Pad under R54 is pretty fried, but hopefully I can make the connection to R53 with a solder bridge or a tiny piece of resistor leg.

 

[turk 182]

any luck?

 

[Cheeto333]

Still waiting for parts to arrive; should hopefully be today. I found a thread here that suggests replacing U3 as well. Crossing my fingers that this works...

 

[turk 182]

take a break it's too close to Christmas...have a scotch with me if nothing but in spirit i wish you well...

 

[Cheeto333]

Thanks Turk, cheers and happy holidays!

 

[Cheeto333]

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.

 

[turk 182]

i'd be looking at the caps. C20ok?

 

[Cheeto333]

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?

 

[turk 182]

i look for shorts or a low resistance across a cap. obvious faults...

 

[Cheeto333]

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?

 

[turk 182]

none that i know.

 

[Cheeto333]

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!

 

[turk 182]

awesome glad you got it sorted....scotch time!!

 

[Burnedfingers]

Old thread but does anyone have a copy of the 112 schematic they would share?

 

[Tarzan]

Go to post nr 17

 

[mjkirk12]

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. 😉