[K4RY] G5400B Rotor Controller Not Working

[Gary Pike]

I would check fuse then connections. If used check for corrosion. Otherwise you might have suffered a strike 

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> On Apr 27, 2016, at 7:18 PM, Kris Kirby <kris at catonic.us> wrote:
> 
>> On Wed, 27 Apr 2016, Sharan Asundi wrote:
>> AU Radio Club,
>> 
>> This is Sharan Asundi from Tuskegee University. As you might be aware, 
>> we?ve recently set up our UHF/VHF station. Our antennas are mounted on 
>> top of the Yaesu G5400 AZ-EL rotor combination. The rotors seemed to 
>> be working fine until recently but now the rotor controller is unable 
>> to actuate either of the rotors. The issue started with the controller 
>> have glitches actuating the AZ rotor but now neither of them can be 
>> actuated. Any suggestion on troubleshooting the controller or further 
>> insight will be of great help.
> 
> Page 11 of the following PDF gives the schematic for the G-5500:
> 
> https://www.yaesu.com/downloadFile.cfm?FileID=8814&FileCatID=155&FileName=G-5500_IM_ENG_E12901004.pdf&FileContentType=application%2Fpdf
> 
> Main (motor) power for the G-5500 is 28V at 2A; the exception seems to 
> be that if a motor limit switch is triggered, it will need a manual 
> assistance to reactivate. Check the rotor installation and make sure 
> that it's not all the way at a limit. The G-5500 has a 450-degree sweep, 
> which is a little over 360 degrees. If there were high winds, it's 
> possible the power supply can't provide enough power over a long run of 
> control cable. OTOH, the G-5500 doesn't appear to have a brake, so it's 
> possible it has been blown around by winds as well.
> 
> I'd disconnect the motors from the rotor control box, attach a 12-ohm 
> 50W resistor and see if the power supply in the rotor control is still 
> working. Once you determine where the power comes out of the rotor 
> control at, you can check the resistance of the rotor cables and rotor 
> motor at once and if you don't get continuity, you know a limit switch 
> has opened or the rotor has twisted in the wind. 
> 
> You mention the G-5400 -- are you sure it's not a G-5500? The G-5500 has 
> been around since the 1990s, and the G-5400 came along before that. 
> 
> G-5400 schematic is on a page near the back of this manual:
> 
> http://foxdelta.com/products/satellite/G5400_G5600.pdf
> 
> 73,
> 
> --
> Kris Kirby, KE4AHR
> Disinformation Architect, Systems Mangler, & Network Mismanager
> President UABARC WB4TJX
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