[Yaesu] FT990 - very ill

[David G. Maley]

I had a similar situation on a FT-900.  Felt really dumb when I realized
what had happened.  Check to see if you have the same situation.
Yaesu ties the speaker return back to case ground in the radio.  There
is no problem with this unless you happen to tie  the same lead 
indirectly back to the power supply negative.  My power cable negative
lead came loose.  This allows all the radio power to ruturn through
the speaker negative lead.  It makes some strange noises right before a
small foil burns off the audio output circuit.  Yaesu advises to put
a 1/2 amp fuse in the speaker ground lead to prevent this.
Dave  WA0ZZG

On Tue, 29 Oct 2002, k4oj wrote:

> On Thursday night before WW SSB my FT990 died...was getting  the rigs 
> and computers all set up for the contest and all seemed fine - then 
> suddenly there was a high pitched sqeal...
> 
> As it was on its departure from the functioning world I heard clicks and 
> high pitched audio coming from the cans...
> 
> The digital display is not working at all and the "radio stuff" is not, 
> either....
> 
> It did not blow the fuse however since the S Meter lamp is on...but it 
> seemed pretty major!
> 
> Have you had a similar experience - before I decide which other goodie 
> to sell to cover my expense for repair of the 990 which I enjoy very 
> much I was wondering if mebbe you had a similar experience and what kind 
> of financial damage you encountered.
> 
> I am wondering what could have been so severe but did not take out the fuse!
> 
> 
> Thanks in advance,
> 
> Jim, K4OJ
> 
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