[Elecraft] K3 always 100 W

[Keith Trinity WE6R]

D36 & 37 on the RF board are;
Elecraft # E560048;
BAS70INCT Diode, 70V, SOT23    Digikey    BAS70INTR-ND


On 2/22/2020 5:04 AM, Pedro, EA4KD wrote:
> Thank you very much Keith and Don. Until today I haven´t had time to review
> the possible failures.
> I have checked and the D37 is failing so I am going to replace both D36 and
> D37, what kind of diodes should I buy to replace them?
> I have also checked the rest of possible and failures and everything seems
> ok.
>
> After about 100k QSO this is second fault, firts changed the pin in the back
> panel about the 12 V error problem.
>
> K3, great rig.
>
> Pedro, EA4KD
> K3 #188
>
> -----Mensaje original-----
> De: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] En nombre de Keith Trinity WE6R
> Enviado el: martes, 11 de febrero de 2020 1:06
> Para: elecraft at mailman.qth.net
> Asunto: Re: [Elecraft] K3 always 100 W
>
> It could be D36 & 37 on the RF board. Earlier ones (1st few thousand)
> had weak components. But any of them can fail and usually there is
> runaway power out.
> If that is not it, look for burned components under the KANT3 board
> around T4 or on the underside near D36 & 37 look for burnt traces.
> If it is older than about #5500, it could be front panel tin pin
> oxidation, replaced them with gold.
> Keith
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