[Elecraft] Power has disappeared, additional info, part 2.

[Joe Subich, W4TV]

Have you tried an external wattmeter to check for power output?

When you make your tests, have you looked at the current draw (use the
internal current measuring capability)?  What is the current with the
rig set to high power (100W) and low power (10W)?

Have you checked the hardware on the low power amplifier (motherboard
and bottom cover)?

Question 1 is an attempt to determine if the internal wattmeter has
failed.

Question 2 is an attempt to determine if the 8.12 MHz (IF) trap has
opened.

Question 3 leads to the possibility that the pre-driver has failed
because of insufficient heat sinking (loose hardware).

If your rig started life as a 10W radio and you have the PA jumper
board, I would also recommend removing the KPA3/switching board
and installing the jumper to conduct low power tests.

Beyond this, I suspect you should be contacting K3support at elecraft.com
to arrange for factory support/return for diagnosis/repair.

73,

    ... Joe, W4TV


On 7/27/2016 9:29 AM, Chris Kimball wrote:
> Thanks for the comments.
>
> The rig is NOT in the TEST mode, that is, the display TX is not flashing.
> Holding the TEST mode produces informative messages in the VFO B area both
> on turn on and turn off.  I'm not certain that the TEST mode produces ANY
> indication at all in the RF scale.
>
> I've bypassed both the KPAT and KAT and set the power to 10W.  Into a dummy
> load I still get just one segment in the RF output, the segment being about
> twice the width of the end tick on the RF scale.  There is a distinctive
> click in going below 13W output.
>
> The rig has only 1 receiver and that receiver has the general coverage
> option. I've tried operating on 80, 40, and 20m with the same no-output
> result.
>
> Just reloaded the latest firmware with K3 Utility. No change in RF output,
> unfortunately.
>
>
>
> --
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> Sent from the Elecraft mailing list archive at Nabble.com.
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