Help me fix my stove???

[dood]

I have a gas stove that I got for free that appears to have a cooked power transformer. Looks fine from the outside, but doesn't have any output.

Here's a scan of the circuit schematic, and a scan of the bottom of the board (it was labeled legibly, but Paint killed it when I saved...)

http://www.king-nerd.com/dood/images...lbumName=house

Any sources for a transformer that takes 120vac and outputs 3.2vac and 20.3vac?

[kc8adu]

Re: Help me fix my stove???

if you are careful you can unwind the tape and replace the thermal fuse.

[starfury1]

Re: Help me fix my stove???

No oven expert here

judging by the secondary voltages I suspect you best chance to get one would be from whom ever made the Stove as a spare part. (probably $$$ even if you can get)

I suppose it depends too, on how common those secondary voltages are to stoves of that type as to if you can get a generic replacement.

Another question might be what killed the transformer?"

did it die of its own accord or did something overload it to the point of destruction.

It may help to work out if the primary or secondaries have gone open or short circuit
to get an idea of what my have killed it

not much help Dood I know

Hopefully, someone on these forums fixes these things and knows the most helpful answers.

[starfury1]

Re: Help me fix my stove???

thermal fuse...... well they are always a good point with bread makers etc and do fail a lot
So yeah good call Kc8adu

I didn't know that the stove transformer would have one
(I was thinking it was small trannie since dood mentioned Gas)

but I don't fix stoves...so guess work at best

[kc8adu]

Re: Help me fix my stove???

if nothing is shorted on the board a common cause for this is loss of neutral.
btw i bet the 3.2 winding is for the vfd heaters.
you might cheat and use 2 transformers.

[dood]

Re: Help me fix my stove???

What I didn't mention is that the control board for the oven appears to have had something spilled down the back of it. A number of traces were shorted together, and actually cooked a small hole in the board. I repaired the board with a little point-to-point wiring, which is when I found out that it's no longer getting any power, anyway.

[dood]

Re: Help me fix my stove???

I'm wondering if I could just find two "wall wart" style adaptors and solder them in?

[kc8adu]

Re: Help me fix my stove???

you probably can.
the 3.2v is gonna be the hard one.
i would carefully unwrap the tape on the old one to find the thermal fuse.its likely open and can be replaced.

[dood]

Re: Help me fix my stove???

do I have to desolder it from the board first?

[kc8adu]

Re: Help me fix my stove???

might make it a bit easier.

[RegR]

Re: Help me fix my stove???

Maybe you can find something here http://www.e-repair.co.uk/


succses,
RegR

[shadow99]

Re: Help me fix my stove???

Most transformers have a thermal fuse buried under the covering or even in the windings. Any I've done are in the primary so a simple continuity test with an ohm meter will tell you if the primary is open. On your diagram the primary is E1 & E2, or the black wire and the white wire. If it measures open (infinity), start digging carefully into the transformer where the primary leads go in to see if there's a thermal fuse. If you find one but cant get it out you can wire another in parallel with it as long as you can get at both leads.

Yes you could adapt 2 transformers to run the 2 circuits as long as the output voltage AND the amperage ratings are proper.