I recently had the same error on my kpa500 recently. 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
Dave
Ww2r
Subject: [Elecraft] Fw: KPA 500 HV Problem.
Message-ID: <
[hidden email]>
Content-Type: text/plain; charset=UTF-8
----- Forwarded Message ----- From: Mike Streeter <
[hidden email]>To:
[hidden email] <
[hidden email]>Sent: ?Tuesday?, ?April?
?30?, ?2019? ?02?:?50?:?12? ?PM? ?CDTSubject: KPA 500 HV Problem.
My KPA 500 has been running ok for several years on 120 Volts. Today I
turned it off on the back , unplugged it and opened the top because I
thought I might need to change the voltage tap. I did not need to change it.
I replaced the top cover, plugged it in and turned it on at the back. All
ok, but when I turned it on with the front panel button the HV reads .1 in
standby. If I tap OPER it shows a hard fault and "270V error" .The Manual
says this is a 270V supply failure and to recycle the mains power KPA 500
after it is corrected. I tried recycling the power but still faults. I don't
have any 270V power from the mains, if I did it would be 240ish, not 270.
The fuse block on the back is set to 115V.Any advice would be welcome.Mike,
WM5DX.
?
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