I would do that trouble-shooting procedure others have suggested to isolate the problem.  We will all be interested in knowing what you discover.
 
I had a somewhat similar issue with my G-5400B back in August 2014 for an ARISS contact in Fontana, California, that I mentored and loaned all of the equipment for.  The air temp was about 100F and we had tested the entire antenna system an orbit before.  But when I went to pre-position the rotors before our contact pass, the azimuth failed to move.  We did a mad scramble up to the roof to see if something had failed and it was obvious something was not right in the Azimuth rotor.  We re-aligned the tripod with the antennas when we realized that we could run just the elevation rotor and rely on the 30 degree beam width of the beam.
 
As near we could tell, the rotors had been in direct sunlight on the roof and the temperature inside the rotor housing was probably high enough that when we ran the azimuth rotor, the heat build up from the motor operating and the sun was enough to thermal out the motor.  The G-5400B schematic does show a thermal overload that I think opened up.  After the contact and once I was home I tried the rotor again and the azimuth still did not operate.  A few days later I took it into Yaesu for repair and they couldn't find anything wrong.  My guess is that the thermal overload finally cooled down enough and remade contact.  Since then I have not had an issue like this one.
 
Something to consider is the thermal overload opening up and taking a long time to reset.
 
73,
Charlie Sufana AJ9N
One of the ARISS mentors
 
 

In a message dated 2023-08-13 10:26:40 Eastern Daylight Time, amsat-bb@amsat.org writes:
 
The first thing to do is to isolate the problem. Is it the az motor, the az cable, or the az side of the control box?
 
To see if it’s the az motor, connect the az motor to the el cable and try to move the az motor with the el control levers. If the az motor won’t move, then the problem is in the az motor.
 
If the az motor does move, then the problem is in either the az cable or az side of the control box.
 
To see if it’s the az cable, re connect the az motor to the az cable but now connect the other end of the az cable to the el side of the control box. Attempt to move the az motor using the el controls. If the motor moves, the fault is in the az side of the control box. If the motor doesn’t move, the fault is in the az cable.
 
Once you have isolated the problem, you know what piece of gear to work on. GL and 73,
 
Ray KN2K


Sent from the all new AOL app for iOS

On Sunday, August 13, 2023, 7:12 AM, Vincenzo Mone via AMSAT-BB <amsat-bb@amsat.org> wrote:

Hello,

today after done a couple of satellites,

I have noticed that the Antenna did not go to the parking position on the Azimuth side.

I have tried to move them manually with the Azimuth Left and Right switches on the Control box

But the antennas did not move.
The Elevation side is OK.
Please what could it be? Something in the Control Box?

What can I try to see if the problem belongs from the control box in the shack or from

The rotator on the roof?
Any help will be really appreciated.
Thanks

 

73 de Enzo IK8OZV
EasyLog 5 BetaTester
EasyLog PDA BetaTester
WinBollet BetaTester
D.C.I. CheckPoint Regione Campania
Skype: ik8ozv8520




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