[Elecraft] KPA500 Will Not Start When Pushing the On Button

[Jack Brindle]

Unplug the AUX IO cable from the KPA500 and try powering it on. If the Power ON/OFF signal
is held low it will prevent the KPA from powering on. It might be that you have connected the
KPA to the new K3 with a straight-through cable, which will cause this problem.

The KPA _will_ power on if the interlock actuator switch is loose, but it will not go into OP mode.

- Jack B, W6FB


> On Feb 17, 2015, at 5:11 AM, Amateur Radio Operator N5GE <n5ge at n5ge.com> wrote:
> 
> This is a 240V Amp.
> 
> When pushing the on button on my KPA500 the power will not come on.
> 
> It worked very well until I moved it to another place on the OP Table.
> and connected it to K3 #1055 after having #1055 brought up to the
> latest version at Elecraft.
> 
> I have checked the fuses and verified that the power cord is supplying
> the proper voltage to the amp internally and externally .
> 
> What is the most likely cause of failure to get power to the amp?
> 
> Which components should be checked next?
> 
> Thanks in advance,
> 
> Amateur Radio Operator 
> N5GE
> 
> I have been up to see the
> Congress and they do not
> seem to be able to do
> anything except to eat
> peanuts and chew tobacco,
> while my army is starving.
> 
> Robert E. Lee
> 
> 
> 
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