Sony ICF C318 Tranformer

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balazn

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Sony ICF C318 Transformer

Hello.
I need some help. My friend came from US and brought Sony ICF C318 Clock Radio. He (idiot xD) connected it to the AC power 220V and the transformer blow up (it was for 120V).

I would like to change the original transformer for one for 220V, but I have a little problem. I don't know what are the outputs of the original 120V transformer.

On that original 120V transformer markings are:

1-433-573-31
LEI-4 0911 E58127

If anyone know what the outputs are, I would really appreciate to tell me so I can buy one with those outputs.

Thank you in advance.
 
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Until it blew, the transformer output was probably double what the rest of the circuit could handle. You might have other failures.

After you get it working, you might find that it uses 60Hz as its time base which will make it show 50 minutes for each actual hour. (It would lose 4 hours per day).
 
The Australian version is 230V 50Hz, P/N of the transformer is 1-433-574-31 from Sony.

But as suggested you may have blown other things, there are two windings on the transformer, neither gives the voltage.
 
Nigel Goodwin said:
The Australian version is 230V 50Hz, P/N of the transformer is 1-433-574-31 from Sony.

But as suggested you may have blown other things, there are two windings on the transformer, neither gives the voltage.
Click to expand...

OK. Tnx.

But, can you tell me, please, what is the output voltage on that transformer? Still I wish to try to fix it.

Also, can you tell me, which two windings are not giving voltage?

Here are the colors of the wires that I have:
1. white with yellow stripe
2. white with blue stripe
3. /
4. white with letters on it
5. white with red stripe

On the input, there are white and black wires.
 
balazn said:
OK. Tnx.

But, can you tell me, please, what is the output voltage on that transformer? Still I wish to try to fix it.
Click to expand...

As I said, the voltages aren't listed.


The primary will be O/C - it's what always blows when you stick 240V on a 110V transformer.
 
indra

I've got the same problem "blown transformer".
When my brother buy Sony radio alarm ICF-C218 from America then plug in in Indonesia.
I've try to measure the resistance of secondary winding.
It seem that there is two winding in secondary winding.
red to white = 3.3 ohm
yellow to blue = 8 ohm
I can't measure the primary winding of course it has all ready short when it blown.
 
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Well.. I've managed to fix it, but the clock is not working, only radio..

And the way I've fix it is very interesting. xD
I took one old charger for Siemens phone and connected it directly to the contacts for the battery. hehehe... Don't ask why I've done that... I was just "playing" with it and it worked... xD
 
Nothing unusual at all, you've simply provided external power to the radio only, so it should work no problem.

The clock is a different matter, as it uses a completely separate winding, and also probably requires it to be AC (for the clock pulses).
 
Some of these transfos have a thermal cutoff in series with the primary windings.

Sometimes if your lucky and it died a quick death and if you're good with a scalpel, you can cut through the outer wrappings to find it and short it out.

Then you will be able to power it up, disconnected, to a proper source voltage and obtain the output voltages.

Of coarse, if your unlucky and the thermal cutoff decided to think about it for a while before doing its job, then the windings may well be melted/fried and your back to square one.

cheers
 
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I' ve succed to repair "blown" radio

I went to winding specialist in Jakarta, then ask them to try to re-winding the blown trafo so the trafo can work in 220 V. It is cost 35000 Indonesia rupiah (about 4 USD). After the trafo got re-winding then I've assembled the trafo to the radio then radio and clock has come back to function again.
After rewinding I've measure trafo output voltage, it is :
yellow-blue is 3.2 VAC
red-white is 4.2 VAC.
Clock is well functioning without frequencies difference error. I think the clock is using crystal for pulses generator instead of AC power supply frequency.
If using original replacment part, it is big cost difference, you can see it on **broken link removed**
The original one is cost about $55.
 
Transformer availability in India

Friends,

I also have the same problem. The transformer blew up when used on 220 AC.

One question: are these two circuits dependent on each other? I tried putting 3 VAC, 50 Hz separately on these two circuits but only the Radio works not the clock. Is it like both these circuits have to be provided with inputs and seems they doesnt work independently. Any idea of the current being produced by the transformer?

Not sure if the clock part is blown up and even if I feed the required AC voltages, it may not work. Can somebody let me know where in India can I get the transformer? Servicing from sony would be too costly.
 
Trafo secondary winding has two independent winding. That is the problem for changing the trafo with common type. Common type trafo with more than one output on secondary winding usually has continuous wire, not two independent winding.
 
Transformer voltages

I've been working with the sony icf-c212 for a couple of months. The transformer in this 120AC clock radio is1-433-573-21. The outputs are approximately 6 volts unloaded and drop 1 to 2 volts when loaded. I think the radio is capable of handling slight variations in the voltage as I've been fiddling around with various transformers and still haven't fried anything. I need to operate this radio on 220 AC as well, so I have to get another transformer for that.

I'm not familiar with with the 318 model but I imagine it uses similar chips as the 212. Don't forget about the difference in frequencies. on the 212, pin 26 on the LM8560N is floating for 60hz and jumpered to pin 15 (~12vdc) for 50hz.

If anybody knows where I can get 1-433-574-31 or 1-435-401-11, I would appreciate some help.
 
I have one 143357321 transformer that came out of one Sony ICF-C112 modified for220V/50Hz.
If anybody needs it just contact me.
 
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