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Re: G-5400B maintenance



The symptoms you describe could be from a dirty position potentiometer in 
the rotor, from corroded or intermittent connections of the rotor cable to 
the rotor, or from a break in the rotor cable where it is secured to the 
mast/tower, from flexing over these many years.

I would check the simplest thing first:  your rotor wire connections at the 
rotor.  Pop the covers off and make sure that the wires or terminal lugs are 
clean and the screws are tight, and that there is no corrosion of the wire 
where it is crimped to the terminal lugs.  If all is okay here, have someone 
watch the indicator while you shake the cables, to test for breaks where you 
have secured them to your tower or mast.

If none of these things help, then the position pot is likely at fault. 
Replacements are available from Yaesu if you want to fix it yourself.  Yaesu 
charges $US70 per hour for repair if you want them to do it  (close to 
$US200 to completely overhaul them for you:  not a bad idea after almost 10 
years of service...)

Hope this helps...

73 DE KA3HSW


----- Original Message ----- 
From: "Alain De Carolis" <alain@alain.it>
To: <amsat-bb@amsat.org>
Sent: Saturday, April 16, 2005 11:31 AM
Subject: [amsat-bb] G-5400B maintenance


> Hello all,
>
> this might have been discussed before, anyhow I wasnt able to find the 
> answer
> in the archives so here is my question for you.
> I have had my G-5400B in place since 1996 and I have never done any kind 
> of
> maintenace since then.
> It works just fine, but it recently started giving me some troubles when
> connected to my fodtrack interface.
> The problem is that the controller (or the rotor??) seem to give an 
> instable
> indication of the azimuth. For just the fraction of a second the value 
> titls
> a little bit and then returns normal.
> It happens when the rotor is in standby (rarely) and more often when it is
> rotating.
> It happens most often when I turn the az rotor and then turn the el rotor 
> with
> the first one still going. The indicator vibrates a little and then return 
> to
> normal course.
> This is not a big problem for manual operations but its the hell of a big
> issue when using fodtrack. In facts, the automatic corrections done by the
> controller turn the system into a phisical oscillator that makes the az
> relays click like a machine-gun and the antenna array shake like if there 
> is
> an earthquake.
> Do I need to clean something? Do I need to change some relay? Do I need to
> disassembly my rotors? What is the routine maintenance that I have 
> probably
> missed?
>
> Thanks
>
> Alain De Carolis
> iz6byy ww3ww
> ----
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