[Elecraft] K1 lost power out

[Thor, N9IK]

Thanks to Rich and Mike for your suggestions.  Here's where I am so far:

Checking the receiver, I listened around all the bands, not hearing much of 
anything.  I tuned to 10.000 MHz to hear WWV, which I can almost always 
listen to.  The signal was only just barely discernable.  I turned on my 
other radio (Kenwood TS-130S), tuned to listen to WWV and heard it coming 
in clear as a bell.

Note: I do not have a signal generator, noise source, or oscilloscope.

Removed KAT1, KNB1, and KFL1-4.
Resoldered R36
performed resistance checks on RF board per page 45 in K1 manual - all 
within specified ranges.
Checked voltages on RF board per page 46 - all within specified ranges.
Placed jumper between pins 2 & 10 of J2 on KFL1-4,
Performed resistance checks on KFL1-4 per page 15 of KFL1-4 instruction 
booklet - all good.
Reinstalled KFL1-4, set power output level to 2.0 watts per page 46.
Listened for, and heard, relays switching while changing between all 4 bands.
Checked attenuator relay and LED, OK, and checked band assignments.
Followed 4-BAND TRANSMITTER ALIGNMENT steps on page 19 of KFL1-4 
booklet.  I was able to peak each band with these results:
      10 MHz band:  2.1 watts
       7MHz band:  2.1 watts
      21 MHz band:  0 watts
      14 MHz band:  0 watts

I guess my next steps will be to build some kind of signal source, such as 
a crystal oscillator, and a RF probe, then see what I can find by tracing 
signals.



>It's a Bad Thing.
>
>My K1 (#1065 with KFL1-4, 40, 30,20, 15m bands) has gotten ill and 
>weak.  I turned it on a little bit ago to listen around the bands & to see 
>what I could find.  On the 20 meter band it would not tune - giving me the 
>message "Plo", meaning that the power is set too low for the tuner to 
>work.  I checked, and the power was set for 5 watts.  I checked the other 
>bands that the K1 covers. Same story on 15.  40 tunes, as does 30.  I 
>attached a dummy load to check power output.  Here's the result:
>
>Output power is set to 5 watts.  I don't have a qrp power meter, so these 
>are taken from the transmit power display on the K1.
>
>40 meters:  1 watt out
>30 meters:  5 watts out
>20 meters:  0
>15 meters:  0
>
>This K1 has installed: KAT1, KFL1-4, KNB1, KBT1
>
>Before I start digging into the innards, any suggestions as to what to 
>check first?
>
>Thanks in advance,
>
>- Thor, N9IK
>
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