Need help finding replacement transformer for oven control board

[In Kamloops]

Thanks everyone, for all you input. I'm gonna wind it down for tonight. I'll check back in tomorrow.

Oh, one last thing before I go... can anyone answer why stoves don't have the screw in type fuses anymore? It seems to me that a fuse might have prevented this from happening. Perhaps that is the reason... industry makes more profit repairing & replacing blown parts instead of selling $2 fuses.

Good night.

 

[Minder]

The part No. is probably a OEM number also being Chinese origin, could mean anything.
Re no fuses any more it is just another means of cost cutting, the same reason that the whole construction quality now is way down now.
A little reverse engineering of the secondary side of the transformer should indicate what you need for replacement.
M.

 

[kellys_eye]

The secondary consists of two separate windings, potentially 0-9 and 0-9 (or, as they are wired 9-0-9).

The use of 9V means as a simple rectified-to-DC output it provides the 12V for the relay operation bt the other 9V isn't too high as to make too much demand on a 5V regulator (dissipation - given it isn't heatsinked).

A 6V secondary wouldn't give enough to power the relays and a 12V secondary would mean too much heat in the regulator.

So now you have to seek a pcb-mounted transformer with 0-9 0-9 secondaries - the current can only be guessed at but armed with the pin-spacing measurements you should be able to match it to a standard transformer available through many component suppliers.

 

[73's de Edd]

Sir Blaine . . . . .


If you're referrring to the info on the yellow tape on the transformer . . . . yes the numbers are indeed significant . . . .

FACTOIDS:


http://listings.findthecompany.com/l/270020883/Leader-Electronics-Inc


http://database.ul.com/cgi-bin/XYV/...n=versionless&parent_id=1073990576&sequence=1


http://database.ul.com/cgi-bin/XYV/...n=versionless&parent_id=1073986741&sequence=1



And then we have info on the the whole SPITFIRE control board unit . . . . with full due emphasis for their positively fulfilling the " SPITFIRE " . . . . . aspect . . . . . ( in your situation.)



http://database.ul.com/cgi-bin/XYV/...n=versionless&parent_id=1073995484&sequence=1



BUT I'M still sure that their has been heavy conversation between manufacturer and supplier on any secondary distribution of board build components.
They are in the . . . . .BIDNESS . . .( a la Elvis ). . . of selling their DAMN complete boards and with NO possibility of some consumer / tech /eng fixing one for "free" . . . . excepting via reverse engineering.
And fully warning them on side dealing in any onesies- twosies . . . or even hundreds.

Now since this board is being yet another of those NON contrasty

board , can you ohm out its foil paths to see if the NOW CONFIRMED . . . high praises be to you . . . single . .2 connection . . .primary winding is being fed by 220 or 120 VAC.
SINCE the MAIN POWER AC crows foot connector could povide either voltage.
Look to the push on connectors on the right board edge and find the L1 . . .L2 . . . and N connections and ohm out to the primary foils at the transformers mounting foil pads and see what we have.

On the transformers 4 secondary pads see if there is a jumper foil being connecting between the two separate windings.
It's now looking like one winding might be ~7.5 VAC and the other ~15 VAC for having proper power supply surplus / headroom to its two supply levels...

Also figure out if your 4 good diodes that you tested are wired in a FULL WAVE bridge configuration, and to what leads of the four foil pads on the secondary of the transformer, that they are connecting to.

Also I never received a confirmation what the numbering of the 78XX regulator beside the main filter is ? Suspecting 7805.

73's de Edd

 

[Minder]

Wouldn't it be more likely to be a 7812?
For logic, it looks like a Darlington array and an op amp?
M.

 

[kellys_eye]

Darlington and op-amp on that board, yes, but the ribbon cable links to another board with circuitry to drive a 7-segment display array so there will be 5V somewhere..... perhaps?

Would need to see the component side of the second board to verify.

 

[73's de Edd]

Sir BLAINE . . . . .

I must have been on page one and not seen your foil side board add on, then done my last post , and never saw the photo of the ckt boards foil side.

Here is a combo of the sides being very close . . . as its top and bottom.

OBSERVATION . . .of the components side

This has a darlington driver chip in the form of a ULN2003 by Unisonic as 18 pin U3 at the far left.
Mid board is a LM358 dual op amp by Tejas Instrumentations. I highly suspicion it arranged as to operate from
a single ended supply.
To somewhat confirm, check the negative leads of the Main filter C1 , and C7 or 3 in front of U1 and C10.
If they share common grounding, it confirms that C10 is fitering the VCC for U4.
Still need U1's suffix numbering

Bottom right corner of board . . .mid connector P5 . . . YELLOW circle . . am I seeing exposed or bubbled
copper foil within that circle?

Just to the right also . .what is the value of R41 resistor, as it seems to rest on the dormant power contact of
that GIANT black ETE . . . formerly Potterly and Bumfield . . .Power relay.
Certainly its being for the oven, with the whites for stovetop elements.

Is this possibly an almost new 2015-16-17 year model ?

Plus it looks to have three superior models above it with more or all of the bells and whistles
this one suggests of only having the self cleaning oven feature and its locking door.

THE FOIL SIDE OF THE BOARD . . .

Looking at the power transformer bottom, we see the two AC input foil lands and the right land passes down and across thru the BLUE jumper wire and makes connection into the L1 power buss. So thats one leg of the incoming AC power supply being accounted for.

The left foil connection goes down and to the right thru a blue jumper to connect into a BLUE MOV which is across the AC supply line. (Strange it didn't show damage to it.)

Then that indicates the other AC supply line connection has to be coming in from that PURPLE circled connection.
(The resistor and series poly cap seem to be a snubber associated with the swwitched contacts of the smaller BLACK relay.)
In that same area are the two ORANGE circled coil contacts of the oven relay they pass up and thru some BLUE jumper wires and into a cluster of side to side foil paths from all of the other relay driver coils and then end up being routed over to their individual sections of the U3 driver array IC.

THE TRANSFORMER SECONDARY . . . .

Now to the secondary of the transformer where the secondary windings are being connected in series by the center foil jumper. Note that there is a foil path that branches off from them and routes down and to the left but becomes a dead end with only a solder drop on it.
That leaves the secondary's summed AC voltages coming out at A and B.
Taking B, it goes upward to a ceramic spike supressor cap being between it and A.
The downward path ends up at the shared anode and cathode of a pair of rectifier diodes.
The diode to the left has its anode connected to the ground plane which connencts to the
negative terminal of the C1 main filter capacitor .
The companion diode path goes downward and its cathode connects to a foil path that ends up at the positive terminal of C1 main filter capacitor ..
The A path goes to the left and joins the anode and cathode of a pair of diodes. The right diodes anode connects to the ground plain and thereby reaches the negative terminal of C1 main filter capacitor
The companion diode has its cathode lead connected to a foil path that passes down and ends up at C1 main filter capacitor terminal.

So they are indeed using a FWB buildup, with discrete diodes.

There is also a foil path that connects C1 filter voltage to the input of U1 regulator input via the ORANGE dotted path.
A also has an AC path that I cannot make out, where it goes up and joins a path of side by side foils near to where I have circled Q500 SM transistor. That path needs to be traced out for its end and any intermediate connectivity.
As it stands . . . I believe that a minimim of 9 VAC thru a 12 VAC transformer at 1 A would be a good test value for evaluating the unit.

COMPARATIVE CIRCUIT BOARD SIDES FOR REFERENCE . . . . .

73's de Edd

 

[BoS]

My in-laws oven and clock stopped working after a tree in their yard fell and hit the power lines.

I inspected the oven control board and discovered the transformer on it looked like it blew. Sure enough, the primary windings are open.

Now I want to replace it but I'm having a terrible time googling for its replacement, so I thought I'd ask here.

It's a Frigidaire stove. Here are pics of the transformer, as well as the OCB.

If someone can point me to a website that has a replacement, I greatly appreciate it.

Thanks, in advance, for any help I receive.View attachment 36944 View attachment 36945 View attachment 36946 View attachment 36947 View attachment 36948 View attachment 36949
Blaine

Hi,
I am from Bosnia and I bought same Kenmore Electric Range with same control board as yours.
I lost wire diagram please can you scan me wire diagram and send it to me, thanks

 

[In Kamloops]

Thank you 73's de Edd for your detailed reply. I had intended to come back to the forum and finish this thread, and then as time passed, it slipped my mind.

In the end, I was able to order a replacement board from a Canadian company (Amre Supply) for $180 CAD. Part #316557115 Popped it in and the stove works fine again. At the time, I put it in, I did take voltage measurements on the secondary coils and they are on my phone. OH NO. I just checked and they aren't there. I literally deleted them last night. I think they are gone.

I'll do it again and post the pics for future reference.

Sir BLAINE . . . . .

I must have been on page one and not seen your foil side board add on, then done my last post , and never saw the photo of the ckt boards foil side.

Here is a combo of the sides being very close . . . as its top and bottom.

OBSERVATION . . .of the components side

This has a darlington driver chip in the form of a ULN2003 by Unisonic as 18 pin U3 at the far left.
Mid board is a LM358 dual op amp by Tejas Instrumentations. I highly suspicion it arranged as to operate from
a single ended supply.
To somewhat confirm, check the negative leads of the Main filter C1 , and C7 or 3 in front of U1 and C10.
If they share common grounding, it confirms that C10 is fitering the VCC for U4.
Still need U1's suffix numbering

Bottom right corner of board . . .mid connector P5 . . . YELLOW circle . . am I seeing exposed or bubbled
copper foil within that circle?

Just to the right also . .what is the value of R41 resistor, as it seems to rest on the dormant power contact of
that GIANT black ETE . . . formerly Potterly and Bumfield . . .Power relay.
Certainly its being for the oven, with the whites for stovetop elements.

Is this possibly an almost new 2015-16-17 year model ?

Plus it looks to have three superior models above it with more or all of the bells and whistles
this one suggests of only having the self cleaning oven feature and its locking door.

THE FOIL SIDE OF THE BOARD . . .

Looking at the power transformer bottom, we see the two AC input foil lands and the right land passes down and across thru the BLUE jumper wire and makes connection into the L1 power buss. So thats one leg of the incoming AC power supply being accounted for.

The left foil connection goes down and to the right thru a blue jumper to connect into a BLUE MOV which is across the AC supply line. (Strange it didn't show damage to it.)

Then that indicates the other AC supply line connection has to be coming in from that PURPLE circled connection.
(The resistor and series poly cap seem to be a snubber associated with the swwitched contacts of the smaller BLACK relay.)
In that same area are the two ORANGE circled coil contacts of the oven relay they pass up and thru some BLUE jumper wires and into a cluster of side to side foil paths from all of the other relay driver coils and then end up being routed over to their individual sections of the U3 driver array IC.

THE TRANSFORMER SECONDARY . . . .

Now to the secondary of the transformer where the secondary windings are being connected in series by the center foil jumper. Note that there is a foil path that branches off from them and routes down and to the left but becomes a dead end with only a solder drop on it.
That leaves the secondary's summed AC voltages coming out at A and B.
Taking B, it goes upward to a ceramic spike supressor cap being between it and A.
The downward path ends up at the shared anode and cathode of a pair of rectifier diodes.
The diode to the left has its anode connected to the ground plane which connencts to the
negative terminal of the C1 main filter capacitor .
The companion diode path goes downward and its cathode connects to a foil path that ends up at the positive terminal of C1 main filter capacitor ..
The A path goes to the left and joins the anode and cathode of a pair of diodes. The right diodes anode connects to the ground plain and thereby reaches the negative terminal of C1 main filter capacitor
The companion diode has its cathode lead connected to a foil path that passes down and ends up at C1 main filter capacitor terminal.

So they are indeed using a FWB buildup, with discrete diodes.

There is also a foil path that connects C1 filter voltage to the input of U1 regulator input via the ORANGE dotted path.
A also has an AC path that I cannot make out, where it goes up and joins a path of side by side foils near to where I have circled Q500 SM transistor. That path needs to be traced out for its end and any intermediate connectivity.
As it stands . . . I believe that a minimim of 9 VAC thru a 12 VAC transformer at 1 A would be a good test value for evaluating the unit.

COMPARATIVE CIRCUIT BOARD SIDES FOR REFERENCE . . . . .

73's de Edd

 

[In Kamloops]

I will get the diagram and post the pics here, sometime this week.

Hi,
I am from Bosnia and I bought same Kenmore Electric Range with same control board as yours.
I lost wire diagram please can you scan me wire diagram and send it to me, thanks

 

[Minder]

In the end, I was able to order a replacement board from a Canadian company (Amre Supply) for $180 CAD.
I'll do it again and post the pics for future reference.

It might pay to take the primary and secondary voltage readings, if it ever happens again, you most likely would get a Hammond Txfr for 1/10 of the board cost.
M.

 

[73's de Edd]

SIr Blaine . . .

That would certainly be a blessing for anyone else that encounters a failure of that UNIDENTIFIED FLYING OBJECT category of small power transformer.

So that a like, EASILY obtainable transformer could be used.
WE basically just need the two AC secondary voltages out and the RAW DC output voltages that they are creating, BEFORE they go into any regulator(s).

Looks like Frigidaire and Sears are both using this board, as well as there being potential other brands.

Calling BoS . . . . . CALLING BoS . . . . . come in BoS. . . .

SOMEHOW I feel that in YOUR situation, that you are not wanting to know or do any involved technical repair of this board, but instead, have pulled off all of its connections and need to know the CORRECT connections where they all go back onto.

Go to YOU TUBE and there is one site . . . . . relevant to your Sears or Frigidaire stove . . . . where a person calls out the wire colors as he is then plugging them back onto the board, and you can watch him do the re install of the board in its hookup..

If this is not the exact one, expect it to be one of the others shown, or you can see the relation ship of wire color coding to functions like .Broil-Bake-L1-L2 etc . . . .

73's de Edd

 

[BoS]

Sir BLAINE . . . . .

I must have been on page one and not seen your foil side board add on, then done my last post , and never saw the photo of the ckt boards foil side.

Here is a combo of the sides being very close . . . as its top and bottom.

OBSERVATION . . .of the components side

This has a darlington driver chip in the form of a ULN2003 by Unisonic as 18 pin U3 at the far left.
Mid board is a LM358 dual op amp by Tejas Instrumentations. I highly suspicion it arranged as to operate from
a single ended supply.
To somewhat confirm, check the negative leads of the Main filter C1 , and C7 or 3 in front of U1 and C10.
If they share common grounding, it confirms that C10 is fitering the VCC for U4.
Still need U1's suffix numbering

Bottom right corner of board . . .mid connector P5 . . . YELLOW circle . . am I seeing exposed or bubbled
copper foil within that circle?

Just to the right also . .what is the value of R41 resistor, as it seems to rest on the dormant power contact of
that GIANT black ETE . . . formerly Potterly and Bumfield . . .Power relay.
Certainly its being for the oven, with the whites for stovetop elements.

Is this possibly an almost new 2015-16-17 year model ?

Plus it looks to have three superior models above it with more or all of the bells and whistles
this one suggests of only having the self cleaning oven feature and its locking door.

THE FOIL SIDE OF THE BOARD . . .

Looking at the power transformer bottom, we see the two AC input foil lands and the right land passes down and across thru the BLUE jumper wire and makes connection into the L1 power buss. So thats one leg of the incoming AC power supply being accounted for.

The left foil connection goes down and to the right thru a blue jumper to connect into a BLUE MOV which is across the AC supply line. (Strange it didn't show damage to it.)

Then that indicates the other AC supply line connection has to be coming in from that PURPLE circled connection.
(The resistor and series poly cap seem to be a snubber associated with the swwitched contacts of the smaller BLACK relay.)
In that same area are the two ORANGE circled coil contacts of the oven relay they pass up and thru some BLUE jumper wires and into a cluster of side to side foil paths from all of the other relay driver coils and then end up being routed over to their individual sections of the U3 driver array IC.

THE TRANSFORMER SECONDARY . . . .

Now to the secondary of the transformer where the secondary windings are being connected in series by the center foil jumper. Note that there is a foil path that branches off from them and routes down and to the left but becomes a dead end with only a solder drop on it.
That leaves the secondary's summed AC voltages coming out at A and B.
Taking B, it goes upward to a ceramic spike supressor cap being between it and A.
The downward path ends up at the shared anode and cathode of a pair of rectifier diodes.
The diode to the left has its anode connected to the ground plane which connencts to the
negative terminal of the C1 main filter capacitor .
The companion diode path goes downward and its cathode connects to a foil path that ends up at the positive terminal of C1 main filter capacitor ..
The A path goes to the left and joins the anode and cathode of a pair of diodes. The right diodes anode connects to the ground plain and thereby reaches the negative terminal of C1 main filter capacitor
The companion diode has its cathode lead connected to a foil path that passes down and ends up at C1 main filter capacitor terminal.

So they are indeed using a FWB buildup, with discrete diodes.

There is also a foil path that connects C1 filter voltage to the input of U1 regulator input via the ORANGE dotted path.
A also has an AC path that I cannot make out, where it goes up and joins a path of side by side foils near to where I have circled Q500 SM transistor. That path needs to be traced out for its end and any intermediate connectivity.
As it stands . . . I believe that a minimim of 9 VAC thru a 12 VAC transformer at 1 A would be a good test value for evaluating the unit.

COMPARATIVE CIRCUIT BOARD SIDES FOR REFERENCE . . . . .

73's de Edd

 

[BoS]

Hi 73's de Edd
can you tell me what is voltage at the plus (+) and of rectifier diodes that is connected on C1 plus (+)
is it 12v or more (12v+12v)

Thanks

 

[73's de Edd]

Sir BoS . . . . .

So you actually did not need to see the placement and wire codes of the push on connectors to the board ?
But are trying to work on the board itself ?

We never did have the EXACT power transformer specs . . .just guesstimating.
But as our Honorable and Esteemed . . . Blaine . . . In Kamloops . . . above, has said he is working on getting them .
See his post # 30.

Do you have an open power transformer primary on your unit also, and was it being bad enough to overheat and boil out some insulative droplets also ?

73's de Edd

 

[BoS]

Sir BoS . . . . .

So you actually did not need to see the placement and wire codes of the push on connectors to the board ?
But are trying to work on the board itself ?

We never did have the EXACT power transformer specs . . .just guesstimating.
But as our Honorable and Esteemed . . . Blaine . . . In Kamloops . . . above, has said he is working on getting them .
See his post # 30.

Do you have an open power transformer primary on your unit also, and was it being bad enough to overheat and boil out some insulative droplets also ?

73's de Edd

I am from Bosnia and Herzegovina and as you know our power network is 220 V 50 hz
What I'm trying to do is to change transformer but I need specification of output power.

I know this one is input power 120v 60 hz as I said I do not know output.
I tested the 4 diodes and all are good.
On the 4 pin side and ohm readings are 1.4 ohms and 2.8 ohms, are those provide a small current and what voltage.
It will be goo id In Kamloops can take voltage measurements on the secondary coils and post it.

Thank for everything.

 

[Bluejets]

I'd be surprised if it is any more than about 1 amp.

 

[BoS]

Thank you 73's de Edd for your detailed reply. I had intended to come back to the forum and finish this thread, and then as time passed, it slipped my mind.

In the end, I was able to order a replacement board from a Canadian company (Amre Supply) for $180 CAD. Part #316557115 Popped it in and the stove works fine again. At the time, I put it in, I did take voltage measurements on the secondary coils and they are on my phone. OH NO. I just checked and they aren't there. I literally deleted them last night. I think they are gone.

I'll do it again and post the pics for future reference.

Can post voltage measurements on the secondary coils, please

 

[In Kamloops]

Hi BoS,

I've got the data sheet scanned but when I try to upload the file, it says the file is too large. I also have video of the voltage tests across the secondary coils. Using my analog meter, it was 5.6 volts on left side, and 4.8 volts on right side, 110 volts input to primary.

I'll get the data sheets and video up in a few hours.

Can post voltage measurements on the secondary coils, please

 

[In Kamloops]

Here is the video of the voltage measurements on the transformer: (1.5 minutes)

Hi BoS,

I've got the data sheet scanned but when I try to upload the file, it says the file is too large. I also have video of the voltage tests across the secondary coils. Using my analog meter, it was 5.6 volts on left side, and 4.8 volts on right side, 110 volts input to primary.

I'll get the data sheets and video up in a few hours.