[amsat-bb] G-5500 rotor motor intermittent

[Michael Hatzakis Jr MD]

Andrew and group,

Read this post and others about the 5500, and I am trying to figure out what
do with my rotor or my controller.  

My rotor has become more and more intermittent over time, so I opened up my
cables and put molex connectors in line so I can debug.  I started with
impedance of the rotor.  My Elevation is working now and my rotation is not.
I pulled out the schematic and see that the rotor motor is on 4-5-6 with the
common on 6 each and the up/down or left/right on 4-5.  I measured the
impedance of 4 & 5 against 6, and the Ele was near 2-3 ohms and the Ele was
open.  I am wondering if this is an intermittent internal limit switch?
Taking my rotor apart is a huge deal, so I want to be sure I am looking at
this situation correctly and what else should I be looking for or measuring?

Michael  K3MH

-----Original Message-----
From: owner-AMSAT-BB at amsat.org [mailto:owner-AMSAT-BB at amsat.org] On Behalf
Of Angelo Glorioso
Sent: Monday, March 28, 2005 8:21 AM
To: glasbrenner at mindspring.com
Cc: amsat-bb at amsat.org
Subject: RE: [amsat-bb] G-5500 rotor motor woes

Hi  Drew,

 At least you got 3 years out of yours. I had my G-500 a month before the
motor went out and had to send it to Yaesu.

 Everything was balance as well. What I think happened is one of the
buttons on the control box got stuck in one direction and caused the
motor to burn up.

 What I did was change the fuse that Yaesu uses from a 2 amp AGC to a 1
amp slow blow fuse. Just in case this happens again, at least the fuse
will blow before causing the motor to go out. 

73 de Angelo

---------------------------------------------------------

If you don't ask, you will never know!! >From: Andrew Glasbrenner
<glasbrenner at mindspring.com> >Reply-To: Andrew Glasbrenner
<glasbrenner at mindspring.com> >To: amsat-bb at amsat.org >Subject: [amsat-bb]
G-5500 rotor motor woes >Date: Mon, 28 Mar 2005 09:20:31 -0500
(GMT-05:00) > >About 3 weeks ago my azimuth rotor motor bit the dust. The
rotor turned left fine, but not right. I tore into the unit and found the
windings on the motor to show 4 ohms in one direction, and only 1.5 in
the other. Yaesu wanted about $90 and shipping  for a replacement, but I
found a G-450 locally for about the same money. After swapping the motors
(identical) and reassembling it seems to work fine, but I can find no
reason for the failure. > >Anyone been down this road before and have
some hints? I'd rather not repeat this procedure in a few weeks. I also
expect longer service from a 3 yr old rotor that cost almost $600. The
inside was dry, and well greased. I don't think it's overloaded either,
with a M2 436cp30, Cushcraft 10x10 2m, and 3ft S band dish near the
center, all well balanced. > >73, Drew KO4MA > >PS Anyone got a spare
motor for my 450? Or need a 450 control box and parts? ;-) >---- >Sent
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