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Re: G-5500 controller question



I ran for 9 years with a 7805 instead of a 7806, ... without the diode, ...
worked fine, ...

----- Original Message ----- 
From: <K5OE@aol.com>
To: <howard@howardlong.com>; <gjmouse@neo.rr.com>
Cc: <amsat-bb@AMSAT.Org>
Sent: Sunday, May 04, 2003 7:52 PM
Subject: Re: [amsat-bb] G-5500 controller question


> Gunther,
>
> G6LVB writes:
> > No change on the Az meter here. From your symptoms I wonder if the Q1
> >  2SC2120/D2-D5 regulator has gone soft. Or maybe the Q2 7806 regulator
has
> >  gone AWOL. Q2 is easy to check without taking the unit apart by placing
a
> >  voltmeter across Az1 and Az3 (should be 6V).
>
> It definitely sounds like Q2.  I had a bad one and, finding this device an
> odd duck, I tried replacing it with the common 7805 with a 1N4001 in the
> ground leg.  This works fine EXCEPT both the meter and the A/D values will
> "jump" when the motor starts.  This drove my Uni-Trac crazy!  Sourcing the
> real 7806 fixed the problem.
> 73,
> Jerry, K5OE
> ----
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