Sir jonj222 . . . . .
In consulting your units wiring diagram :
OBSERVE . . .
At the top we see full 220 VAC coming down as a wire at each side of the schematic and the right Neutral passes down to the right and turns to the left and connects as a WHITE wire to a push on connector N.
The other sides wire routes down at the left and reverts to turning to the right and connects as a BLACk wire to the L1 push on connector.
Now stoves are using a full
220VAC, so that wiring shows that the transformer primary is being connected to the L1 and N connections and will be receiving
220VAC AC power on the transformer primary . . . .24 + hrs a day !
BUT these transformers are wound as a high impedance primary which means many more turns than normal so that the transformer runs cooler in being run at constant power on. The secondary windings are scaled accordingly. Just enough power from the transformer to meet maximum needs is produced.
That then leads to your comment of . . .
I accidentally hooked up my used wall oven wrong and blew the transformer.
In which case, that transformer is permanantly hooked in circuit all of the time and runs on a full 220 on its primary winding, so I don't see how you could get MORE than 220 V into its primary to " blow " it.
You must have just got some external wires / connectors together for he spread out big blackening deposit . . . . however I don't see any burnt off connectors or melted copper blob deposits.
However, you did find the opened thermal fuse in the transformer primary.
Now I don't know if time, heat and age may have caused the winding of the primary to break down and cause a shorted turn(s) or cluster(s) thus creating a constant further heating and current consumption of the primary.
OR . . . . . if you are lucky a close to the utility pole / line transformer lightning hit in an electrical storm, may have knocked that fuse open. ( But I really would suspect the winding opening up first. )
Otherwise, its being a thermal rise made of a meltable fuse link that opens its circuit upon exceeding a fixed heat threshold . . . . plus you can see its CLOSE proximity to the winding, for heat sampling.
(Sometimes you even find these being physically placed deep down within the unit pressing against the core.)
Since you now have the yellow insulative covering away from the primary half, does the magnet wire windings surface seen to show of any discolorations, as being subjecture of having heated up in the past ? Or any bubbling / wrinkling or discolorations of insulated wraps at their edges, being used on successive winding layers deeper on down , towards the core ?
Evaluating the transformer . . .
The transformers other halfs secondry winding, will be a little harder to be able to confirm what its nornal AC voltage outputs are.
It would be mainly dependent on your initially viewing the different wire colors used and associating the number of separate windings connected to them.
I somehow feel that I am not seeing ALL of the secondary windings wire terminal stakes coming out, but I do count 4.
What is of SUPER- UTMOST importance now, is that for the first few seconds of testing that transformer, is that you get AC measurements on those secondary windings.
Replacing that thermal fuse might get things working all fine again. But if the secondary voltages are unknown, you will never find them with an open primary.
That info you just DON'T find being available, without having a good working unit for voltage comparisons. ( FAT CHANCE )
Now there is still the posibility of overheating of the transformer and destroyed insulation letting a few turns short together. That could be the basic transformer fault, as that will cause the transformer to heat up.
Also, the secondary windings voltages will be a wee bit higher than is normal.
If my situation to solve . . . . I would be doing this procedure . . .exactly . . . .. . . . .
I would get 4 (or more) pieces of insulated hook up wire 2-3 feet long to be able to strip ends and tin and then solder to the 4 (or more) terminals of the transformer secondary. Run them out and take the other ends and strip enough insulation away to make a 1/8- - - -1/4 in round twisted eyelet to facilitate meter probing contact area.
Firmly tape them to a heavy piece of corrugated cardboard with each of them slightly spaced apart. Number each terminal.
That leaves you with a then slightly remoted, easier access to the measurements of the AC voltages on that transformer .
They are isolated from your 220VAC on the primary and being a safe " cold" voltage.
I came to a stop here . . . . . after reading your latest post . . . . and the bad news right there in River City .
Now look at the transformer drawing below and see if it is agreeing in the wiring hook up to your transformers wire terminal stakes.
On one pic I think that I can see a fine copper wire coming from the end of the winding and ruting as I have added in the RED color coded route and wrpping around the D terminal stake. That stake also takes a wrap around from the BLUE lead of the thermal fuse and the fuses other GREEN lead wraps around C stake.
B stake is unused.
The all important A stake takes the fine ORANGE coded primary wire that is routed deep down and starts as the beginning of the primary winding. God forbid that you loose sight of that CRITICAL fine wire or at least a visible tip, so that a fine bare wire can be tinned and then the visible tip scraped and tinned and then a solder drop joins the two then they lift up so that an INSULATIVE drop of epoxy can be made to ensurround them, and be spaced away from the core metal..
HEY . . . you finally gave a view of 5 terminals being on that secondary, I could not fathom only 4, with my suspicioned needs of that transformer delivery requirements.
As is being shown here. . . . . .
Also, you never gave a pic of the front of the unit but this ***** shows an electroluminescent type display which would need a negative 50-70 v supply and a filament supply of ~3-4 VAC. Then the 6-12 VDC supply needed for the power relays coils and a minor +5 DC basic logic supply. Since you also didn't show the logic board / brains in the center of the unit .
***** DISPLAY . . . . .
https://cdn2apex-control-boards-9tl...ntent/uploads/2019/05/DSC_0002-1-1.jpg?iv=323
Suspicioned needs of the power transformer . . . . .
Back to referencing to the bottom half of the top pic of the transformer, where I suspect the VIOLETS to be one sole winding .
Then the BROWNS will be another separate isolated winding. Then a connection between the end DARK BROWN winding and one of the ends end of the BROWN winding would replicate my other transformer wind shown above.
Get a BRIGHT light, magnifier lens and then see what you can find of the errant, very fine "orange" . . . start of winding wire.
( Finding The OTHER end is a piece of cake.)
I pause . . . .
73's de Edd . . . . .
If a cow laughed HARD , would milk come out her nose ?
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