[Elecraft] K3 always 100 W

[Pedro, EA4KD]

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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