[Elecraft] K2 SN 6059 no SSB transmit

[Don Wilhelm]

Bob,

I am not certain what your problem is.  Tune will transmit a carrier at 
the requested power level whether in SSB or CW.  It is supposed to work 
that way.

An alternate way to check for the correct carrier balance setting is to 
leave the mic connector open (do not connect a microphone = no audio, 
even noise pickup) but instead connect a key or paddles.  Close the dot 
paddle (or straight key) -- that is the same as closing PTT on the K2, 
then adjust the carrier balance pot for minimum RF as indicated by a 
'scope or an RF Probe connected across the dummy load, or the S-meter 
reading on another receiver (with a short receiving antenna).  If using 
the RF Probe, do the carrier balance adjustment as indicated in the 
manual (SSB BAL) first so you do not have a level of RF at the dummy 
load that will damage the RF Probe.

73,
Don W3FPR

Robert Hoey wrote:
> K2  SN 6059 no SSB transmit
> Folks, I’m trying to get a newly built SSB board working on my K2.  K2 works on CW per Don’s set up and testing last year.  I’m working through the SSB alignment on the SSB manual. Stopped on page 19 at “Fine Carrier Balance Adjustment” where it asks that I verify K2 is transmitting when PTT is pushed.  K2 is set for 5 watts power, SSB /LSB mode, SSBA is 3, SSBC is 2-1, FL1 is selected.  My wattmeter shows no output when I push PTT.  Wattmeter shows about 5 watts when I push “Tune.”  Checking for component orientation, proper component, cold solder joints, solder bridges, etc. all looked good.  Checking the DC voltage levels on the troubleshooting chart revealed some discrepancies:
> On receive:
> U1-U5 all pins looked ok except :
> U1-6 was 5.5 v., should be 5.1 v.		U1-26 was .24 v., should be 0.0 v.
> On transmit:
> U1-U5 all pins looked ok except :
> U1-10 was 2.8 v., should be 3.1 v.	U1-13 was 5.75 v., should be 5.9 v.
> U1-14 was 5.6 V., should be 5.9 v.	U1-16 was 3.0 v., should be 5.4 v.
> U1-17 was 4.1 v., should be 5.6 v.	U1-28 was 5.4 v., should be 2.4 v.
> U2-8 was 3.0 v., should be 5.4 v.
> All the diode voltages looked to be OK.
> I am at a loss as to where to look next and what exactly to look for, and would greatly appreciate any and all comments and inputs.  Thank you for your attention.
> Bob Hoey KI4RSE
>
>