[Elecraft] K2 kaputt

[raimon]

Dear Don
I refer again to my problem with K2/100
You wrote on 02/09/07:
"The oscillation possibility is an 'educated guess', so do change C31 
and then if a problem persists, we can offer additional assistance if 
you give us data and your observations/conditions"

I substituted C31 with two 0.1mf capacitors in parallel (my local 
supplier had run out of stock of 0.22 mf capacitors.
Now things have improved, as voltages in diodes D1 trhough D14 are all 
right, but the problem persists.

I remember to you what is the problem and my observations:
Recently I upgraded the KPA100 with KPA100UPKT, it passed all tests (I 
did not realign it), and it worked perfectly for two weeks.
One day I worked in the morning without any trouble, but when in the 
afternoon I fired it up again, the KAT100 was unable to tune: relays 
clicked, diodes did not light, tune was not obtained.
I disconnected KAT100 and observed that K2/100 was not working right.
Connected to a dummy load, power and swr readings in the LCD display are:
   Setting  9 w         Read  9.8 w   swr  1.2.1
   Setting 30w         Read  27 w    swr  1.8.1
   Setting 90w         Read   64 w   swr   2.4-1     first appears HiCurr
Connected to the same dummy load through an external wattmeter, swr 
readings are negligible, but the power indication is very high (120w)
The bare K2 (disconnected from KPA100) shows no problem. Connected to 
the same dummy load and to an OHR qrp wattmeter, power indications agree 
in both LCD and wattmeter and swr is negligible.

I guess there is a bad performance of the swr reading circuit of the KAT100.
Where do you think that I should look for a cure?
Your assistance will be greatly appreciated.
73  Raimon
EA3EZO
rfuidio at telefonica.net