[Elecraft] [KPA500] 270V ERR

[Jack Brindle]

It sounds like you really need to contact the tech support guys for this one. The small cable from the microswitch plugs into the Power Supply board. Make sure it is properly seated. It is behind the big toroid transformer, so you may have to move that to check. The signal indicating that 270V is bad comes from the PA module to the front panel over the ribbon cable that is permanently attached to the PA sandwich. Make sure that cable is securely plugged into the front panel connector.

The 270V is enabled when the KPA500 goes into OPER mode. If you always get this fault when switching from STBY to OPER, it is an indication that something is not right in the power supply. Again, contact Customer Support to get their help in tracing this down.

To specifically answer your question, it is ’NO'. The IO board has no part in getting the 270V supply going, checked, and reported to the front panel board.

Good luck getting the KPA500 going again. It is a great amplifier! But then I’m a bit biased…

73!
Jack Brindle, W6FB
Elecraft Engineering

> On Aug 7, 2020, at 9:11 AM, LA7NO <ptaa at ieee.org> wrote:
> 
> Hello,
> 
> We are constantly getting the "270V ERR" when switching over to OPER.
> We have checked that the micro-switch is working properly and is correctly
> operated by the lid.
> We have also tried the power reset, but still the same.
> 
> We know there is a problem with the I/O card, since we are not able to get a
> PC connected to the serial port - RS232 (PC).
> So, we can not use the KPA500 Utility Program.
> 
> Is it in any way possible that a fault on the I/O-card can cause the "270V
> ERR" message?
> 
> 73,
> 
> Per-Tore
> LA7NO
> 
> 
> 
> 
> -----
> 73,
> 
> Per-Tore / LA7NO
> 
> --
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