Sony ICF-C12W Radio Clock schematics (power)

[UserXP]

Re: Sony ICF-C12W Radio Clock schematics (power)

Thank you all for this info.

Yes, I would like both the clock and the radio to operate. A full feature device.

No, I can't see anything inside that resembles a backup battery on the PCB. There is also no battery compartment.

No, this one does not have a voltage selector switch, although I saw a version with a round hole and a switch to set the input voltage. On the back of the case it says Input: 120V, 60Hz. But I guess all USA designated devices have this voltage rating.

The power cable goes directly into the transformer. It is rather a small one and completely encased in metal shielding of some kind (I will provide images if that would help). On the other side of the transformer there are those three wires coming out directly to the main PCB. There is also a small daughter PCB housing a LED display, a big chip and buttons for the settings and actions.

Do you think a socket power converter would be enough to start up the device? I came across this clock radio and took it because of nostalgia. It looks nice, isn't scratched and would make a great prop from the 80s. If we manage to bring it back to life, it would be icing on the cake.

[stj]

Re: Sony ICF-C12W Radio Clock schematics (power)

well the transformer in the schem is 5-0-5 so maybe a 4.5-0-4.5 bell transformer would fit.

[eccerr0r]

Re: Sony ICF-C12W Radio Clock schematics (power)

Despite having a PP3 to backup the clock, I'd be surprised if it doesn't require line power for clock operation.

But it might actually autodetect 50/60Hz...

[stj]

Re: Sony ICF-C12W Radio Clock schematics (power)

if it has a backup battery then it probably wont use the mains for timing,
but looking at this schematic, it probably has a special transformer to drive the vfd heaters

[R_J]

Re: Sony ICF-C12W Radio Clock schematics (power)

If you only want the radio to operate, changing the voltage would be ok but for the clock to operate, the input voltage is not the only problem, the frequency will be wrong and the clock usually uses the zero cross of the a/c sign wave to keep time.

Are you sure it does not have selectable voltage/frequency input? I see some specs on the internet that suggest it might. https://www.radiomuseum.org/r/sony_d...o_icf_c_2.html

[UserXP]

Hello, good people. Hope you are all doing fine.

As the title says, I have a question about this Sony Dream Machine clock radio model ICF-C12W from the 80s. I,ve recently come into possession of it, but it is intended for 110-120V input, not 220-240V power rating which is used where I live.
I have this idea of replacing its inner transformer with the one that operates on 220-240V mains. I have opened the housing, there are no ratings on the current transformer. On its output side there are three wires coming out and going to the PCB. One is black, the other two are red. I guess it is a dual voltage output, but I don't know the output voltages.

Does any of you have schematics for this specific model or knows what voltages this transformer outputs (if there are any of you who did repairs on this particular model)?

I don't own a power step down transformer to try the device as it is. If I did, I would be able to easily measure the output voltage on those wires, but that is not possible at the moment. Any help from you would be grat. Thanks in advance.