I stupidly applied 20 volts DC to the power input of the radio. There was a crack sound and the radio is now dead. Does the radio have an internal protecting fuse? Can anyone help? David

On 06/12/2022 12:13, david butler wrote:
> I stupidly applied 20 volts DC to the power input of the radio. There was a crack sound and the radio is now dead. Does the radio have an internal protecting fuse? Can anyone help? David

Doesn't seem to be digital or TV.

There is no fuse, although, if you are very lucky there are couple of
chokes (L22 and 23) that could have fused before anything more important.

<https://www.cryptomuseum.com/spy/sony/icf7600ds/files/icf7600ds_service.pdf>

On Tue, 6 Dec 2022 13:27:20 +0000, David Woolley
<david@ex.djwhome.demon.invalid> wrote:
>On 06/12/2022 12:13, david butler wrote:
>> I stupidly applied 20 volts DC to the power input of the radio. There was a crack sound and the radio is now dead. Does the radio have an internal protecting fuse? Can anyone help? David
>
>Doesn't seem to be digital or TV.
>
>There is no fuse, although, if you are very lucky there are couple of
>chokes (L22 and 23) that could have fused before anything more important.
>
><https://www.cryptomuseum.com/spy/sony/icf7600ds/files/icf7600ds_service.pdf>
Very, very lucky - they're only 1uH coils, maybe like this example:
https://cdn.shopify.com/s/files/1/2085/2053/products/1uHferriterodcoreinductor_6x15mm_6.5turns_c408333d-e8f5-4ad6-aabe-58a291960704_1024x1024@2x.jpg
--
Dave W

On 06/12/2022 15:33, Dave W wrote:
> Very, very lucky - they're only 1uH coils, maybe like this example:
> https://cdn.shopify.com/s/files/1/2085/2053/products/1uHferriterodcoreinductor_6x15mm_6.5turns_c408333d-e8f5-4ad6-aabe-58a291960704_1024x1024@2x.jpg

If they are on a core like that, the OP's luck is probably out, as the
core will increase the thermal mass.

No.
I imagine its fried. Maybe its got some kind of regulator, but I'd not hold
my breath.
Brian

--

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"david butler" <djbutler@talktalk.net> wrote in message
news:f70d3fd4-4d6c-4e7d-9284-2c0c5839a837n@googlegroups.com...
>I stupidly applied 20 volts DC to the power input of the radio. There was a
>crack sound and the radio is now dead. Does the radio have an internal
>protecting fuse? Can anyone help? David

I'd doubt they are the issue then. More likely to have fried the output chip
or transistors and maybe the rest as well.
Brian

--

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The Sofa of Brian Gaff...
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Blind user, so no pictures please
Note this Signature is meaningless.!
"Dave W" <davewi11@yahoo.co.uk> wrote in message
news:i3ouoh5dkbdbh9nd5hgfvpvul5317ldi7j@4ax.com...
> On Tue, 6 Dec 2022 13:27:20 +0000, David Woolley
> <david@ex.djwhome.demon.invalid> wrote:
>
>>On 06/12/2022 12:13, david butler wrote:
>>> I stupidly applied 20 volts DC to the power input of the radio. There
>>> was a crack sound and the radio is now dead. Does the radio have an
>>> internal protecting fuse? Can anyone help? David
>>
>>Doesn't seem to be digital or TV.
>>
>>There is no fuse, although, if you are very lucky there are couple of
>>chokes (L22 and 23) that could have fused before anything more important.
>>
>><https://www.cryptomuseum.com/spy/sony/icf7600ds/files/icf7600ds_service.pdf>
>
> Very, very lucky - they're only 1uH coils, maybe like this example:
> https://cdn.shopify.com/s/files/1/2085/2053/products/1uHferriterodcoreinductor_6x15mm_6.5turns_c408333d-e8f5-4ad6-aabe-58a291960704_1024x1024@2x.jpg
> --
> Dave W
>

On 07/12/2022 15:18, Brian Gaff wrote:
> Maybe its got some kind of regulator

The circuit diagram shows several regulators, and at least one DC/DC
convertor, with several transistors switching the raw input in various
directions. One regulator seems to be directly connected, and probably
drives the control logic.

There was too much for me to bother working out where all the first line
failures could be, and to what extent exposed components might be
over-voltage or current tolerant.

You'd need to start by looking at the boards to see which components
looked like the smoke might have been let out.

On 06/12/2022 12:13, david butler wrote:
> I stupidly applied 20 volts DC to the power input of the radio. There was a crack sound and the radio is now dead. Does the radio have an internal protecting fuse? Can anyone help? David

Sorry to hear,

With items, I have a sad knack of applying current *backwards*, normally
from a bench power supply with a current limit that doesn't limit (faulty)

"measure twice, cut once" doesn't apply to me.

Tears before sunset ;-(

Look for burnt IC packages, and then your next unopened vodka bottle :-(

And then, eBay (either to buy, or sell as unworking...)

Yeah, regulators - list them out and find from datasheets their
specified input voltage ranges. Unsolder them that have been overvolted
by spec, and test on a scrap breadboard and a variable PSU if they still
work, that is if they haven't exploded.

I'd hope some small DC voltage headroom, as a use case for an auxiliary
DC power socket is to be wired to some noisy poor regulated supply, say,
from a car engine or similar?

--
Adrian C

On 06/12/2022 12:13, david butler wrote:
> I stupidly applied 20 volts DC to the power input of the radio. There was a crack sound and the radio is now dead. Does the radio have an internal protecting fuse? Can anyone help? David

If you want to replace it the XHDATA D-808 is just about the nearest
thing I've come across recently.

https://smile.amazon.co.uk/dp/B077Z2P28F/

--
Brian Gregory (in England).

On 14/12/2022 21:53, Brian Gregory wrote:
> On 06/12/2022 12:13, david butler wrote:
>> I stupidly applied 20 volts DC to the power input of the radio. There
>> was a crack sound and the radio is now dead. Does the radio have an
>> internal protecting fuse? Can anyone help? David
>
> If you want to replace it the XHDATA D-808 is just about the nearest
> thing I've come across recently.
>
> https://smile.amazon.co.uk/dp/B077Z2P28F/
>
" How did we start?

XHDATA was established in 2019, X stands for infinite, H stands for
happy, DATA stands for data, "XHDATA" means infinite storage of happy
moments, the main is committed to the independent research and
development, design and sales of radio broadcasting products"

Do Chinese marketeers smoke weed?

--
Adrian C

On 15/12/2022 13:22, Adrian Caspersz wrote:
> On 14/12/2022 21:53, Brian Gregory wrote:
>> On 06/12/2022 12:13, david butler wrote:
>>> I stupidly applied 20 volts DC to the power input of the radio. There
>>> was a crack sound and the radio is now dead. Does the radio have an
>>> internal protecting fuse? Can anyone help? David
>>
>> If you want to replace it the XHDATA D-808 is just about the nearest
>> thing I've come across recently.
>>
>> https://smile.amazon.co.uk/dp/B077Z2P28F/
>>
> " How did we start?
>
> XHDATA was established in 2019, X stands for infinite, H stands for
> happy, DATA stands for data, "XHDATA" means infinite storage of happy
> moments, the main is committed to the independent research and
> development, design and sales of radio broadcasting products"
>
>
>
> Do Chinese marketeers smoke weed?
>

Quite possibly. Or maybe they use something stronger.

--
Brian Gregory (in England).