[amsat-bb] Re: Help Desperately with Rotator YAESU g-5400b

John Kopala jkopala at gmail.com
Mon May 2 22:10:00 PDT 2011

One correction to the information on the G5400B.  The schematic locates the capacitors in the rotor for
elevation and in the control box for azimuth.

This unit uses relays to perform the actual switching.  So check the following:
1. Disconnect wires 4, 5, and 6 to the elevation rotor.  If you don't disconnect the  wires, you will get a reading on both pins 4 and 5 measured from pin 6 due to the run capacitor.
2. Use a voltmeter to check for AC voltage between pin 6 and Pin 5 when you press the UP button.
3. Check for AC voltage between pin 6 and pin 4 when you press the down button.
4. I don't know the exact voltage but would guess something around 25 to 30 volts AC.
5. If these work correctly, the problem could be the limit switch, the run capacitor, or the motor, all located in the rotor housing.
6. If either voltage is not present the problem is in the control box and could be either the relay or the relay driver transistor.
That should help pin things down quickly.  I'll send the schematic directly.

John Kopala

Hi Folks,
hope in an help to solve my problem with my Rotator Yaesu G-5400B.
Today i was tracking the ISS, ad while i was tracking it  I got The AO-51 in
AOS. As I am using the Trackbox, and i did not have under my eyes the
control box, I heard the Trackbox passing from ISS to AO-51. I gave an eye
to the control box and saw it was stuck at  35 degrees and it did not go
down to the 0 degrees to start the AOS. I have pulled out the connector
which connects the control box to the Track box and tried manually To bring
down the antennas. I've tried to press the "DOWN" switch, but they did not
move from that position.
I've tried to press the "UP" switch and noticed that the antennas moves
going up.
Then i have tried also with the "RIGHT" and  "LEFT" switches of the Azimuth
and noticed also that the antennas moves in both sides.
At the end i can say that the antenna moves in all the positions except for
Please anybody can tell me what is happened?
As the antennas are now stuck at 45 degrees i am afraid that the wind can
cause problems.
I Hope in an help.
Any help will be really appreciated.
Thanks in Advance

73 de Enzo IK8OZV

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