Hi Jeff, KB2M
Despite the problem on your shoulder you can locate the fault on your azimuth control and display just from the shak.
Without disconnecting any wire from the back of your control box connect a DC voltmeter between terminals A1 and A3 and you should read about 5.5 volt DC
Connect the DC voltmeter between terminals A2 and A3
When the antenna is rotated fully CCW you should read 0 volt and rotating the antenna by 360° CW the voltage should linearly increase up to about 5.5 volt
If you pass the above test than the 500 ohm potentiometer inside the rotator is OK
If not or the potentiometer is gone or one of the wires A1-A2-A3 running from the control box to the antenna is interrupded.
To test if the control box alone is OK or not disconnect wires A1-A2-A3 from the rear of control box and connect to it a 500 ohm wire wound potentiometer to simulate the potentiometer inside the rotator.
Manually turning the above potentiometer you should have the angular position information of the pot wiper (A2 wire) both on control box meter and PC software.
Have fun !
73" de
i8CVS Domenico
----- Original Message ----- From: "Jeff Griffin" kb2m@comcast.net To: "Amsat-Bb" amsat-bb@amsat.org Sent: Wednesday, July 11, 2007 3:01 PM Subject: [amsat-bb] Yaesu 5500 rotor problem
I'm having a problem with my 5500-azimuth display and control. I haven't used it in a few weeks, tried to work some passes last night and
discovered
that I lost azimuth control and display. Big problem here is that I had an operation on my shoulder on July 6th and have the use of my left arm only. So I thought I would ask here to try and streamline the repair process.
Here
are the symptoms...
Elevation works fine in manual or computer control.
Azimuth works in manual mode, but no location information is displayed on control unit or pc software. Also no computer steering , only way to turn
is
manual input , but no position display.
I tried to tweak the azimuth pots, no joy. Was thinking possible dead
spot.
Any useful info would be appreciated. Sometimes I wonder if I hit bottom
yet
in this worst year of my life...
73 Jeff kb2m