[Elecraft] KAT100

[raimon]

Dear Don

This is my last e-mail, sent some days ago.
> 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 switch correctly.
I substituted D1 and D2, but the problem persists.
Connected to a dummy load, and ATU menu to CAL, the LCD of the K2/100 
shows the requested power and swr 1:1 (confirmed with an external 
wattmeter and swr reader), with the difference that at low power the 
first left LED of the ATU100 lights, and at high power none of the LEDS 
light.
Switching between CAL and AUTO you hear relays switching, as well as 
when switching to L0-L8 etc.
Where should I look to find the reason of this malfunction?
Thanks and best regards
73
EA3EZO
Raimon