what do u mean by terminal numbers?

 

. . . . . . .

Can you please tell me, where i connect each leg?

. . . . . . .

Each end of the winding was connected to a particular leg (of the original transformer).

I identify the lugs by numbers.

Ramesh

 

i couldn't. cuz it was already broken as i told . the leg and the winding had broken.

 

You need to do some bit of Reverse Engineering and get the schematic of the unit - it is not too difficult for this unit.

Ramesh

 

please you serch for the schematic.
i give you product details

Kemei
KM-3087

 

please you serch for the schematic.
i give you product details

Kemei
KM-3087

No Deal.
You have the Unit,
You can see the PCB,
You can know the components used . . . .

We can Help, Not Do.

Ramesh

 

please you serch for the schematic.
i give you product details

Kemei
KM-3087

I think there must be thousands of PCB of this nature being designed in China for different purposes. Unless it is a named brand like Apple, Nokia, Sony or Panasonic, only then you'll be able to get the service manual or schematics online.

For that simple SMPS of yours, you should be able to reverse engineer (trace the circuit and wiring and draw it on a piece on a piece of paper. Then attach it here....

Ramesh has been very helpful to offer you good advices on how to do it.

Allen

 

Here are two SMPS power supplies that I found on the net by googling. They both used 3 coils ferric transformers similar to yours.

One of them has an opto-copule while the other one has not. I think the "z" of 200z indicates the number of turns in the coil. The "dot" on the coil indicates the starting point of the windings if all the coils are wound in the same direction.

HTH.

Allen

 

i want to make a new transformer. i broke the outer structure of broken transformer and i took the coil.
then i started to open the winding, i unwraped a long wire and after that it finished.
then i removed a green layer of plastic between the two winding.
then i started to unwrap the inner winding. during unwraping the inner winding, i see that either the wire broke or it might be already cut and it was made up of two pieces of wire. I am not sure about that.
then i unwraped it completely. now i have three pieces of wires. i'll tell u the length of these soon
what you have to do is to tell me how to make new winding

Hmmmmmmmmmmm. The drawings don't seem to match. One of the windings must have been a tapped one . . .. .

Ramesh

 

here is the circuit diagram.
View attachment ALIM4791.zip

 

.....................................................

 

I redrawn your circuit using a circuit drawing program. Hope it is clearer now for others to offer help.....

Allen

 

Thanks absf. Nicely done. Incidentally, what's the program used?

Sadiq 3210, please check your drawing once again.

C1 of that value (470 nF) in that position seems doubtful.
Why is the battery shown as 6 V? I thought it was 3 V (2.4 V)

I guess the transformer Tags and windings are as attached.
Can you rewind the original tranformer and get an idea of the number of turns per winding?

Ramesh