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  • Sony ICF-7600D radio

    From david butler@21:1/5 to All on Tue Dec 6 04:13:26 2022
    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

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  • From David Woolley@21:1/5 to david butler on Tue Dec 6 13:27:20 2022
    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>

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  • From Dave W@21:1/5 to All on Tue Dec 6 15:33:37 2022
    T24gVHVlLCA2IERlYyAyMDIyIDEzOjI3OjIwICswMDAwLCBEYXZpZCBXb29sbGV5DQo8ZGF2aWRA ZXguZGp3aG9tZS5kZW1vbi5pbnZhbGlkPiB3cm90ZToNCg0KPk9uIDA2LzEyLzIwMjIgMTI6MTMs IGRhdmlkIGJ1dGxlciB3cm90ZToNCj4+IEkgc3R1cGlkbHkgYXBwbGllZCAyMCB2b2x0cyBEQyB0 byB0aGUgcG93ZXIgaW5wdXQgb2YgdGhlIHJhZGlvLiBUaGVyZSB3YXMgYSBjcmFjayBzb3VuZCBh bmQgdGhlIHJhZGlvIGlzIG5vdyBkZWFkLiBEb2VzIHRoZSByYWRpbyBoYXZlIGFuIGludGVybmFs IHByb3RlY3RpbmcgZnVzZT8gQ2FuIGFueW9uZSBoZWxwPyBEYXZpZA0KPg0KPkRvZXNuJ3Qgc2Vl bSB0byBiZSBkaWdpdGFsIG9yIFRWLg0KPg0KPlRoZXJlIGlzIG5vIGZ1c2UsIGFsdGhvdWdoLCBp ZiB5b3UgYXJlIHZlcnkgbHVja3kgdGhlcmUgYXJlIGNvdXBsZSBvZiANCj5jaG9rZXMgKEwyMiBh bmQgMjMpIHRoYXQgY291bGQgaGF2ZSBmdXNlZCAgYmVmb3JlIGFueXRoaW5nIG1vcmUgaW1wb3J0 YW50Lg0KPg0KPjxodHRwczovL3d3dy5jcnlwdG9tdXNldW0uY29tL3NweS9zb255L2ljZjc2MDBk cy9maWxlcy9pY2Y3NjAwZHNfc2VydmljZS5wZGY+DQoNClZlcnksIHZlcnkgbHVja3kgLSB0aGV5 J3JlIG9ubHkgMXVIIGNvaWxzLCBtYXliZSBsaWtlIHRoaXMgZXhhbXBsZToNCmh0dHBzOi8vY2Ru LnNob3BpZnkuY29tL3MvZmlsZXMvMS8yMDg1LzIwNTMvcHJvZHVjdHMvMXVIZmVycml0ZXJvZGNv cmVpbmR1Y3Rvcl82eDE1bW1fNi41dHVybnNfYzQwODMzM2QtZThmNS00YWQ2LWFhYmUtNThhMjkx OTYwNzA0XzEwMjR4MTAyNEAyeC5qcGcNCi0tIA0KRGF2ZSBXDQo=

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  • From David Woolley@21:1/5 to Dave W on Tue Dec 6 15:58:33 2022
    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.

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  • From Brian Gaff@21:1/5 to All on Wed Dec 7 15:18:12 2022
    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

    --- SoupGate-Win32 v1.05
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  • From David Woolley@21:1/5 to Brian Gaff on Wed Dec 7 15:40:14 2022
    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.

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  • From Brian Gaff@21:1/5 to Dave W on Wed Dec 7 15:20:49 2022
    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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    "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


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  • From Adrian Caspersz@21:1/5 to david butler on Sat Dec 10 11:13:40 2022
    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

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  • From Brian Gregory@21:1/5 to david butler on Wed Dec 14 21:53:14 2022
    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).

    --- SoupGate-Win32 v1.05
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  • From Adrian Caspersz@21:1/5 to Brian Gregory on Thu Dec 15 13:22:05 2022
    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

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Brian Gregory@21:1/5 to Adrian Caspersz on Fri Dec 16 18:23:17 2022
    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).

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Brian Gregory@21:1/5 to Brian Gregory on Fri Dec 16 18:27:47 2022
    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/


    Having said that maybe I should also say that the right person may well
    able to fix the ICF-7600D for you.

    If it was mine I'd have a go myself but I think the possibility that I'd accidentally end up making it worse is too high for me to reasonably
    offer to try and fix one for someone else.

    --
    Brian Gregory (in England).

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)