[1000mp] Malfunction of 1000MP Mk V antennatuner

[Jaakko]

Thanks for the advice Hans - my 1000MkV had exactly the same symptoms on
40m. After some research I found a flash-over under L6404.

Jaakko - OH8NJ
----- Original Message ----- 
From: "Hans Remeeus" <hans@remeeus.nl>
To: <1000mp@mailman.qth.net>; "FT1000 Mark V List" <MarkV@yahoogroups.com>
Sent: Saturday, January 10, 2004 12:41 PM
Subject: [1000mp] Malfunction of 1000MP Mk V antennatuner


> Two weeks ago I had a malfunction of the Mark V antennatuner. While tuning
> with low power of 25 Watts the tuner made a curious noise and it went to
> smell (stink). After that I could not tune properly, even not a dummyload.
> The curious noise kept on.
>
> The failure was a coil in the antennatuner of the Mark V, which was built
to
> close to the PCB.
>
> During tuning there happened to be a flash-over (a short circuit between
the
> coil and the PCB) which apparently caused the smell and the malfunction.
On
> the upper side of the antennatuner we could not see anything which could
> have been the reason. However on the underside of the antennatuner we
could
> see a kind of short circuit (a black spot) of the PCB.
>
> We mounted the coil more upwards from the PCB. In this way there is no
short
> circuit possible between the coil and the PCB. We cleaned the PCB and
> checked the other coils.
>
> The antennatuner is working again!
>
> Perhaps this information is of your interest.
>
>
> 73, Hans Remeeus.
> Ham Radio: PA1HR
> www.remeeus.nl
>
> Communication is about people, the rest is technology.
>
>
> _______________________________________________
> List Moderator: Richard Lubash N1VXW
> 1000mp mailing list
> 1000mp@mailman.qth.net
> To Change Options or Unsubscribe:
> http://mailman.qth.net/mailman/listinfo/1000mp
>