Re: Topband: FT1000 Screws loose

[Steve Lawrence <smlx@earthlink.net>]

On Feb 5, 2004, at 4:39 AM, Tom Rauch wrote:

One of the things I noticed installing mods in FT1000's is about half 
have
mounting screws holding the circuit boards that are loose. I never 
noticed
an operational problem from this.


_______________________________________________

Tom - My 1000D has been at Yaesu a few times. I had excessive gain in 
the Sub RX and the gain adjustment pot could not compensate. They had 
to change some fixed resistors which required removing the Sub RX 
board. It's likely that at board reinstallation the screws weren't 
torqued sufficiently.

As John, K9DX, says:

"I have found loose screws to cause birdies on 10 meters. The birdies 
are
not a clean notes, but a broad rushing type sound that raises the 
S-meter an
s unit or two."

This was my symptom. When it first cropped up, I thought it was some 
local old TV gone berserk. But a tap on the cabinet suggested 
otherwise. The really odd thing is that the problem started to occur 
several years after the Yaesu repair. The screws were probably torqued 
just enough during the repair but worked loose with time and 
temperature. My D has always been, as most, in a very benign 
environment. None-the-less, the problem was very noticeable. It was a 
real head scratcher for some time but I was pleasantly surprised to 
find such a simple fix.

To All: Whenever the cabinet is open for any reason, I'd recommend 
checking all reasonably accessible PC board mounting screws. It's just 
too easy not to do. (Caution: leave the PA transistor screws alone!)

73, Steve WB6RSE

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