[Elecraft] K2 kaputt

[raimon]

Dear Don
My K2/100 is working again
I replaced D16 and D17, resoldered all components of the wattmeter 
circuits, and all problems with swr and power readings were solved.
Many, many thanks for your help.
I was not so happy with the ATU/100.
When you try to tune, relays switch,  swr leds do not light,  LCD  
shows  swr 1:1, although it should show more than 2:1, switching stops 
after 2-3 seconds, and if you tune again the process repeats.
K2/100 and KAT7100 communicate: high or low power indication leds light 
according to the power required, Ant 1 and Ant2 switch correctly, all 
switches
Maybe there is a problem with U8?
Your kind assistance will be welcome once again.
73
Raimon
EA3EZO
> Raimon,
>
> If it were on my workbench, the first thing I would do at this point 
> is to replace KPA100 D16 and D17, then check the operation of the 
> wattmeter again.
> If I understand correctly, it did work at one time, so no additional 
> calibration of the wattmeter should be required.  If the new diodes do 
> not correct the bad readings, then you should look for an unsoldered 
> or poorly soldered connection in the wattmeter circuits - R26, R27, 
> U5, U6, Q10 and Q11 as well as the associated resistors and 
> capacitors.  Check the schematic to see which components are connected 
> to the listed devices.  Check the lead tinning and soldering of T4 at 
> the same time.
>
> After the KPA100 is working correctly, add the KAT100 and check the 
> combination.  If you have to obtain 1N5711 diodes to replace the ones 
> in the KPA100, order 2 for the  KAT100 at the same time so you will 
> have them available in case they are needed.