[amsat-bb] Re: Yaesu 5500 rotor problem

i8cvs domenico.i8cvs at tin.it
Wed Jul 20 06:04:05 PDT 2011

Hi Jeff, KB2M

I have sent to you the schematic diagram for the G5500 but the message
bounced back to me  because your @comcast.net don't match with my

By the way and first of all check if you have 5 volt DC between studs
A1 and A3 and between studs E1 and E3 on the rear of control box.

If you don't have 5 volts DC probably the regulator Q2 7806C is gone.

If you have another email address please let me know and I will try again
to send you the schematic diagram.

73" de

i8CVS Domenico

----- Original Message -----
From: "Jeff KB2M" <kb2m at comcast.net>
To: <amsat-bb at amsat.org>
Sent: Tuesday, July 19, 2011 10:54 PM
Subject: [amsat-bb] Yaesu 5500 rotor problem

> I'm having a problem with my 5500 after a thunderstorm. What is happening
> is that the rotor works manually, but doesn't display az and el
> on the control box. Also when I try to use computer control it goes all
> way to stop in both azimuth and elevation. I'm thinking this might be in
> control box, as both az and el are doing the same thing, the control box
> being the single point of failure. Did anyone ever have this problem? How
> can I diagnosis what chip might be at fault without a schematic. I vaguely
> remember having this same problem after a close  lightning strike with my
> prior az el Yaesu box about 14 years ago but don't remember what chip I
> swapped out, or how I determined which one was at fault. This getting old
> thing really sucks. Any help would be appreciated.
> 73 Jeff kb2m
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