"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."
If it were mine I'd measure the voltage and ask for the low and high warning levels. Of course you must take proper precautions. There is a reason there is an interlock switch.
My KPA 500 notes include this:
"Investigation revealed
the PSU board multiplier could produce 210V OFF LOAD with the PSU>LPF jumper
disconnected but only 60v when the jumper was connected. Simulating the pin
diode current consumption with a resistor also produced the same result.
Turned out that R16 which should have been 100 ohm was now 1.2Mohm.
Replacing it fixed that problem
While talking to elecraft support it transpired that there was an upgrade
kit (E850607) that replaces the Q5 FET on the LPF board with a transistor
(as usual no reference could be found to it on the elecraft web site!). This
upgrade has also now been done"
I regret that I did not record the source.
Andy, k3wyc
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