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K1 D1 LED issue

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W4RAM

K1 D1 LED issue

Good morning,
I am looking for your advice with the follow issue:

D1 LED in my K1 does not work. LED does not light when I activate the RIT
function. I can see in the screen when RIT is activated (ON/OFF).
I already checked the D1 position, also solder, they look correct.
This problem may seem simple to fix, however, and I'm not sure if the
solution is just change the led.

Thank you for your advice and assistance.

Al
W4RAM

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Vic Rosenthal

Re: K1 D1 LED issue

Measure the voltage across the LED when it’s supposed to be on and off. That will tell you whether the LED or something else is at fault.

Victor 4X6GP

> On 10 Jul 2020, at 7:25, W4RAM <[hidden email]> wrote:
>
> Good morning,
> I am looking for your advice with the follow issue:
>
> D1 LED in my K1 does not work. LED does not light when I activate the RIT
> function. I can see in the screen when RIT is activated (ON/OFF).
> I already checked the D1 position, also solder, they look correct.
> This problem may seem simple to fix, however, and I'm not sure if the
> solution is just change the led.
>
> Thank you for your advice and assistance.
>
> Al
> W4RAM
>
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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David Gilbert-2

Re: K1 D1 LED issue

Not necessarily. If the LED is shorted (admittedly a less likely
possibility) it won't have any (or at least very little) voltage across
it ... just as if its drive circuitry was bad.

Having been an engineer responsible for some LED product lines in the
long distant past, I would say that the most likely faults would be an
open LED (bad wire bond) or some fault in the drive circuitry, but a
crystal fault could also cause a short in the LED.

73,
Dave AB7E

On 7/9/2020 9:34 PM, Vic Rosenthal wrote:

> Measure the voltage across the LED when it’s supposed to be on and off. That will tell you whether the LED or something else is at fault.
>
> Victor 4X6GP
>
>> On 10 Jul 2020, at 7:25, W4RAM <[hidden email]> wrote:
>>
>> Good morning,
>> I am looking for your advice with the follow issue:
>>
>> D1 LED in my K1 does not work. LED does not light when I activate the RIT
>> function. I can see in the screen when RIT is activated (ON/OFF).
>> I already checked the D1 position, also solder, they look correct.
>> This problem may seem simple to fix, however, and I'm not sure if the
>> solution is just change the led.
>>
>> Thank you for your advice and assistance.
>>
>> Al
>> W4RAM
>>
>>
>>
>>
>> --
>> Sent from: http://elecraft.365791.n2.nabble.com/
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]