[Yaesu] FT990 tuner problem

[Dave Maley]

That vintage of Yaesu radio used one backup battery for CPU memory and
tuner memory.  The problem is, if the battery goes low, the tuner won't
work.  Check your battery or replace it.  It's a standard Sony battery
with solder tabs welded to it.  You don't have to get it from Yaesu.
Dave  WA0ZZG




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> Today's Topics:
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>    1. FT990 tuner problem. START makes tx,	but does not start
>       tuning. (Sat Q)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 3 Apr 2012 08:07:56 -0700 (PDT)
> From: Sat Q <privacy4me2please at yahoo.com>
> Subject: [Yaesu] FT990 tuner problem. START makes tx,	but does not
> 	start tuning.
> To: "yaesu at contesting.com" <yaesu at contesting.com>
> Message-ID:
> 	<1333465676.7219.YahooMailNeo at web121506.mail.ne1.yahoo.com>
> Content-Type: text/plain; charset=utf-8
>
> Hello,
> ?
> I have a problem with a 990. Somehow the tuner fails, when I press START
> only TX comes on, but there is no tuning action.
> When I switch the backup switch on the tuner board off, an press MOX, for
> example in CW, the transceiver starts to tune on most bands (exept 160 and
> 80m). This makes me think the tuner still works, but why will it not work
> when pressing tune START. I browsed through the schematics, but I can?t
> find how the tuner control board gets the start tune command.
> ?
> Can anyone tell me how this toner works, where to look for, or should I
> look for another tuner (control board)
> ?
> Kind regards,
> ?
> Edwin PE1PWF
>
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> End of Yaesu Digest, Vol 112, Issue 1
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