The voltage regulator in my KR-5400A was damaged by a lightning strike and had to be replaced........ 73, Harvey K5HV
----- Original Message ----- From: "i8cvs" <domenico.i8...@tin.it> To: "Joel Black" <jbblac...@gmail.com> Cc: "'AMSAT'" <amsat-bb@amsat.org> Sent: Saturday, March 13, 2010 19:20 PM Subject: [amsat-bb] Re: Playing With Lightning > ----- Original Message ----- > From: "Joel Black" <jbblac...@gmail.com> > Cc: "'AMSAT'" <amsat-bb@amsat.org> > Sent: Saturday, March 13, 2010 10:44 PM > Subject: [amsat-bb] Playing With Lightning > >> I certainly appreciate all the replies and the encouragement. >> >> If any of you with a G-5400 controller would check something out, I'd >> appreciate it. When I move up or right, there is a momentary deflection >> in the opposite direction. Then, when I release the button, it jumps >> ahead a bit by just a few degrees. If I move down or left, there is no >> immediate deflection, but when I release the button, it deflects in the >> opposite direction. I just don't remember mine acting that way before >> the strike. >> >> Thanks, >> Joel, W4JBB >> > Hi Joel, W4JBB > > Trouble-shooting for your G-5400 > > I suggest you to momentarily disconnect the wires A1-A2-A3 going from > the rear of the control box up to the rotator. > > Connect temporarely for test a 500 ohm wire wound potentiometer to > terminals A1-A2-A3 of the control box taking into account that A2 is the > wiper of the potentiometer. > > Power supply the control box and rotate very slowly by hand the shaft of > the potentiometer. > > If the pointer of the azimut instrument follows accordingly your rotation > by hand than there is no damage into the control box. > > Repeate the same procedure for the wires E1-E2-E3 to test the elevation > remembering that E2 is the wiper of the potentiometer. > > If the pointer of the elevation instrument follows accordingly your by > hand > rotation of the potentiometer then there is no damage into the control > box. > > If the deflection of the instruments is still like you describes probably > the integrated circuits C3 and C4 into the control box where damaged by > the strike. > > Reconnect the original wires between the rotator and the control box and > using a high impedance DC voltmeter measure the voltage between A2-A3 > and E2-E3 > > While rotating the antennas left and righ and up and down observe if the > voltage follows smootly the above rotation. > > If the voltage jumps there is probably a damage into the potentiometer > wipers inside the rotator > > Check if the voltage between A1- A3 and between E1-E3 is about 6 volts. > > The voltage must remain constant at about 6 volts rotating the antennas > othervise the voltage regulator Q2 was damaged by the strike. > > Using the above trouble-shooting you can establish if the problem is > located > into the rotator or into the controlbox or along the wires connecting > both. > > Have fun ! > > Best 73" de > > i8CVS Domenico > > > > > > _______________________________________________ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
