[Elecraft] KPA #455 not very well

[Nicolas Drin]

Hi 

I just finished to build KPA500 #455. Unfortunately I found several
problems.

1/ fan is not working (I already checked that the 2 wires are a the right
place on the plug - no inversion like someone reported earlier)

2/ I coupled the KPA500 to the K3 with the KPAK3aux from Elecraft. For some
bands (14,21,10,5.3) when I push the button on the front of KPA500 the band
is changed on K3 but NOT on KPA500 (example 14 gives 1,8 - 21 gives 7) ! For
this 4 bands, in TX mode, the KPA500 automatic band switching selects the
proper band.

I thought to a software problem and i tried to reload the firmware (after a
parameter reset to default value) and I run to my third problem...

3/No communication available with the KPA500. I tried two configurations Mac
and PC. The serial / USB cable is the KUSB from Elecraft and both systems
are perfectly working with K3 and P3 so I am pretty sure that it is a KPA500
problem.

I don't have the schematics of the KPA500 (and in the other hand I'm not a
brilliant technician...) so any help will be appreciated. I should mention
that I already build Norcal 40, SIERRA, K1, KX1, K2, K3, P3 so I have a
little experience and I already checked that I didn't make any mistake 
(wire ribbon cable inversion or badly plugged, no thermal insulator).  I
performed all test with success with my DMM during the building.

Last point the HF module seems to wok without problem.

So again thank in advance for any help

Nicolas, F5HFZ

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