[Elecraft] Probelm with KPA-100

[Dave White]

I have a KPA-100 that is not putting out any power.  The K2 operates fine 
using the standard "QRP" power (up to 10 watts).  Power is good and the SWR 
is low.  When the power control is advanced to bring in the KPA-100 (relay 
"click"), the power reading immediately goes to "1" and there is no power 
output.  The KPA-100 is recognized and the PA is turned "ON" in the setup 
menu. Everything else appears normal .This is a used KPA-100 and there are 
no obvious signs of damage; the construction quality looks to be excellent. 
The previous owner said there was no history of problems.

Any quick ideas on where to start the troubleshooting process?  I have some 
"hobbyist" test equipment and "modest to good" troubleshooting skills.

Thanks in advance for your help.

Regards

Dave White, VE6DRW
dwds at trinustech.com