Ian,
Could you also send me a copy, I have an older amp as well.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources
On 5/3/20 1:14 PM, iain macdonnell - N6ML wrote:
On my early model, the interlock switch is actuated by an assembly
including a 13mm 4-40 standoff (and some other hardware), which is
attached to the inside of the top cover. I'll attempt to send you the
old (rev C) assembly manual off-list.
73,
~iain / N6ML
On Sun, May 3, 2020 at 1:07 PM Tom Doligalski via Elecraft
<elecraft@mailman.qth.net> wrote:
Problem is definitely the interlock switch not being engaged correctly: if I
close it manually (with a wooden rod!) the amp operates normally.
Anyone have an assembly manual for the older type KPA500, so I can see how the
top-panel interlock switch is supposed to be engaged? Again, this a fairly old
amp, and Elecraft changed things in later versions (like the one covered in the
assembly manual currently on the website).
Thanks!
Tom W4KX
On May 3, 2020, at 3:21 PM, Tom Doligalski via Elecraft
<elecraft@mailman.qth.net> wrote:
Hi Jack!
After cycling the main power the HV in standby is back to 70 V. But, every time
I go to operate mode, the error reoccurs.
This is with what I believe was the old style interlock switch (has a shaft
attached to the top cover to engage the switch when the top is screwed down).
Can’t tell if it is properly engaging. But the behavior is the same when the
top cover is totally removed.
How picky is this switch. I bought the amp used, and the assembly manual online
at elecraft doesn’t cover the old interlock switch.
Thanks for your help!
Tom W4KX
Sent from my iPad
On May 3, 2020, at 3:06 PM, Jack Brindle <jackbrin...@me.com> wrote:
A “270V ERR” fault indicates that the TR switch bias supply is not working.
This may be caused by the top cover being removed, the safety switch attached
to the top cover becoming loose or an actual failure of the 270V supply. Since
your main HV supply is now down close to 0V, it looks like you have power
supply issues. You should call technical support on Monday to get help.
73 and good luck getting your KPA going again.
Jack, W6FB
On May 3, 2020, at 11:32 AM, Tom Doligalski via Elecraft
<elecraft@mailman.qth.net> wrote:
My KPA500 has been working fine waited for 115 V. Just now it has been throwing
a “25=70 VAC” fault!
Can anyone lead me in helping this? Fuses look good. HV read 0.1 v when in
standby, which is FAR from the 70 some volts it used to read.
Thanks!
Tom W4KX
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