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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