[amsat-bb] G5500 control box issue

[Kevin]

David,
   It's not clear if you have the old style G5500 or new style G5500DC, 
you say brand new be it needs to be asked.

  If the old style there is a 7806 regulator in the control box that 
feeds 2 15 ohm resistors, one for AZ and one for EL, between A1 and A3 
you should have 6 volts or close to it, same between E1 and E3, A2 and 
E2 are the returns and the voltage varies depending on the position of 
the rotors.

  So check for the voltage, if zero disconnect both az and el cables and 
see if it is now there, if so you have a short in your cables somewhere, 
if still missing then the 7806 has probably failed.

  If you have the newer G5500DC then I have no idea as I do not have one 
and so far I have not seen a schematic of the inside of the new DC 
controller.

73
Kevin WA7FWF


On 5/31/2020 3:06 AM, David Worboys via AMSAT-BB wrote:
> Good morning,
>
> Although I will be talking to Yaesu tomorrow, I wondered if anyone had experienced this (and possibly now has a reason/solution to the problem)
>
> I have a brand new G5500 and most of yesterday was spent putting up the mast, rotators and antennas etc.
>
> The control box worked perfectly for a while but then decided to not indicate where the antennas are pointing to AT ALL!
>
> The rotators are working perfectly but the needles are stuck at zero.
>
> The only action they have seen is in the set up and calibration process, there is not even a radio attached to the system at this point - I didn't get that far before the box stopped working.
>
> As I said, I will of course be getting this resolved as quickly as possible with Yaesu and the place I ordered it from but I would be interested if anyone had had the same thing happen.
>
> Many thanks
>
>
> David
> KG4ZLB
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