At 01:50 AM 1/19/2023 +0000, gary_mayfield(a)hotmail.comwrote:
> I have repaired several 5400 rotators (I no longer own
> one). The pot can often be repaired. There is a small wire connecting the
> center of the pot to the solder lug (this will make sense when you see
> it). The wire twists as the pot and rotator rotate. It will often fail at
> the solder joint making intermittent contact causing the position
> indication to jump and/or have dead zones. Replace the small wire and it
> will work another 10 years or so.
Thanks to everyone for advice on the azimuth pot, I'll give
Yaesu parts a call and cross my fingers.
Amazing the rotor worked this long with no problems or maintenance.
Has anyone found a video on the web of disassembly and re-assembly
of the rotor, with important points to be aware of? I only want to
disassemble just enough to work on the pot and its connecting wires.
From my testing I'm sure it's a combination of bad pot and connecting
wires. Issue only manifests itself from around 300 to 0 degrees azimuth
with it occurring at different spots in that location depending on whether
it's rotating clockwise or counter clockwise . The ohms reading across pins
one and three drops from 500 ohms to around 200 ohms or less.
Testing resistance between pins 1 and 2 when rotating, smooth 0 to 500 ohms,
Between pins 2 and 3 when rotating is where I get the resistance hiccup.
It won't keep me off the birds, but I'll mainly only be able to do satellite
passes that are east of me until fixed.