[K3] Err 12v

[wrmoore]

I am working on an friends K3 (#4446), recently purchased used.  When I
got it, Power-On resulted in "ERR DSE." Firmware load failed, so I did
EEINIT, and then the firmware (4.22) loaded correctly.  After going
through filter setups to match the on-board filters, things seemed to be
working correctly.  But then I tried to increase power beyond 12w, and
now I get the "ERR 12V", which my friend had seen before.  When that
error occurs, the KPA3 fans come on.  The manual says to reset the
circuit breaker, but it wasn't tripped.  Just for kicks, I tried to do
the Tx Gain Calibration through the K3 Utility (dummy load attached),
and even at the 5w level, it fails.

I need some advice on how to proceed.

Tnx es 73,
Randy, KS4L
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[Hardy Landskov]

I recently had Q6 on the LPA board fail shorted, in which case you will get
no power out at all.
It's a MOSFET and very prone to an ESD event since it is on the antenna.
Check gate-to-source resistance with an ohm meter. Should be 800 or so ohms.
73 N7RT

----- Original Message -----
From: "Randy Moore" <[hidden email]>
To: "Elecraft Discussion List" <[hidden email]>
Sent: Friday, January 07, 2011 7:45 PM
Subject: [Elecraft] [K3] Err 12v

>I am working on an friends K3 (#4446), recently purchased used.  When I
> got it, Power-On resulted in "ERR DSE." Firmware load failed, so I did
> EEINIT, and then the firmware (4.22) loaded correctly.  After going
> through filter setups to match the on-board filters, things seemed to be
> working correctly.  But then I tried to increase power beyond 12w, and
> now I get the "ERR 12V", which my friend had seen before.  When that
> error occurs, the KPA3 fans come on.  The manual says to reset the
> circuit breaker, but it wasn't tripped.  Just for kicks, I tried to do
> the Tx Gain Calibration through the K3 Utility (dummy load attached),
> and even at the 5w level, it fails.
>
> I need some advice on how to proceed.
>
> Tnx es 73,
> Randy, KS4L
> ______________________________________________________________
> 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 

______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
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