[Elecraft] K2/100 - Hi Curr and loss of power control - help! de VK7JB

[VK7JB]

Hi Group,

Using my K2/100 #6998 on 20m SSB phone today, running it into an
experimental small loop antenna.  SWR was 1.5:1.   Then:  

Hi Curr warning on LCD - shows continuously in TX.
Maximum power out (>100W) independent of power control setting
LED Bargraph stopped displaying RF output (ie no bars lit) despite > 100W
output measured on external power meter.

Disconnected antenna and attached dummy load - same symptoms.

Could I have somehow fried D16 & D17 in the KPA100?  I checked these diodes
in-circuit with my multimeter "diode test" function and there is no voltage
drop across either.  Does this mean they've both failed open?

Is there anything else I should check/look for/measure before I dismantle
the KPA100 and replace D16 and 17?

Any advice appreciated as always,

73,
John
VK7JB




--
View this message in context: http://elecraft.365791.n2.nabble.com/K2-100-Hi-Curr-and-loss-of-power-control-help-de-VK7JB-tp6485865p6485865.html
Sent from the Elecraft mailing list archive at Nabble.com.