Is the schematic for 8520870 control board available

There is nothing specific available online. The videos maybe of help.

https://www.google.com/search?q=general+electric+wb27t10268+oven+control+board+replacement

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Hello. The pictures I've attached are the best I can do for the schematic of your unit. The service manual has been poorly copied into a computer file and the schematic is hard to decipher even when directly looking at it! I hope I helped you!

It will be some where, try google, try espares.co.uk they are good for things like that, use them a lot.

There won't be a schematic available for what your asking. Only electrical schematics that show wiring harness (to and from) the A/C controller. So what I suggest you do is go to a "Pick Your Part" type wrecking yard and get a replacement controller from a simalar Buick or Chevorlet model. Should be a couple different models built in '05 that use the same controller

Did you ever get the schematic for the x10 barking dog? I need one now.

they can trip inside you can't see it so flip them on ...off fast and hard push off very hard to reset

The list of problems is as long as the one Obama inherited when he took over. Good news though, the most expensive part works, the blower motor! The pilot is established which rules out a gas issue. The two most common problems are, either the temp controller or the infinate switch is bad. Your unit has one or the other but, not both. Controller has several wires leading to it & has a green or tan circuit board on it, infinate switch is a small black or white 2 inch square box with 4 or 5 wires leading to it. Each one of these are mounted thru the front control panel & both have knobs. Temp board around $180, infinate switch around $45. As far as the schematic is concerned, Vulcan was bought by Hobart & they DO NOT give out schematics or service manuals.

The light is controlled by a relay on the circuit board. The problem is there are no schematics available and individual parts are not available.

There is no schematic available. Only point to point wiring for the various modules. If you have no power at all, nothing starts glows or blinks on the control panel or on any of the various boards then you will need a service call to try to resolve the problem. It may require a board swap to see if that board is at fault. Unfortunately the days of repairing boards are long gone. Sorry!

Dave T