[Yaesu] Fw: FT-1000d High SWR Problem

[Harrison Thomas]

----- Original Message -----
From: "Tom Harrison" <tomharrison@cwnetdg.io>
To: <1000mp@qth.net>
Sent: Sunday, December 30, 2001 9:04 AM
Subject: FT-1000d High SWR Problem


> Help needed for repairing FT-1000D.
> Panel meter on FT-1000D shows high SWR with the power contol turned
> all the way down. No difference with the tuner in or out. When the
> power control is turned up, The SWR meter pegs.
>
> With a Bird watt meter inserted into the following places no SWR is
> detected:
> (1) J7201 input to the LP Filter board
> (2) J7207 ouypuy of the LP filter board
> (3) Between the antenna jack and an external dummy  load.
>
> The Protection Unit board cuts the output power back to just a few
> watts.
> DC voltage measured at J7204, output  of the LPF board shows
> reflected voltage is higher than the forward voltage.
>
> With the plugs removed from jacks J7203 and J7204 of the LPF Unit,
> the output power into the dummy load comes back up to the rated
power
> of the FT1000-D with no SWR. (But, of course, there is no meter
> reading of power and SWR on the panel meter.)
>
> Diodes D7202 and D7204 were changed but the problem remains.
> Has anyone on the list been through this one before?
> Regards,
> Tom
> vq9wb
> Diego Garcia
>