Looking at the schematic for the 5500 there are 2 op amps that drive the meters. That would be my guess seeing how there is not much more than that. I believe someone else may have mentioned this. Could be a 2 dollar fix? 

On Wednesday, June 26, 2024 at 04:43:30 PM EDT, jeff griffin via AMSAT-BB <amsat-bb@amsat.org> wrote:


Ok. I removed the LM7812 and put in a LM7806. I now have 6v between pin1 and pin3. I also still have full scale on the meters. I  tried all the things that were suggested. including the OHM test between wire on pin1 and  wire on pin3 500 ohms , and 250 or so between  wop2  to wop3 and wop1. SO it looks like the rotor is ok, it still rotates in AZ and EL. I'm going to leave the 6v VR in as my cable runs are only about 30 feet. What to do next. I have two broken G-5500 control boxes here, the one I'm working on, and one with a bad transformer(it blows fuse when turned on). I also have half a working spare rotor, I forget if the AZ or EL is broke. If I send the box into Yaesu to fix, it will with the shipping probably be at least $200. I called Yaesu and they have new G-5500 control boxes for $380. I'm running out of stuff to try with this issue, and there isn't a lot of info to try and dig in any deeper. If I don't come up with anything I think I'm just going to buy a new control box, either the Yaesu or possibly another Green Heron FT-21azel. I'm going to give this another day, I'm hoping someone has had and fixed the same issue. Thanks for the continued help with this...


73 Jeff kb2m

 


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