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Subject: Re: [M]: Dead LX200
From: Email address hidden
Reply To: mapug@shore.net
Date: Sun Feb 22 00:18:20 2004
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While you're here, how about checking out the
Astronomy Book
List ? |
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Snip
> The RA assembly appears to be working properly. I used Bruce Johnston's
> technique for applying power to the motors and electronics. The motor runs
> and the output of the comparators looks normal. Is it possible that I could
> have damaged the motherboard when I reversed the connector? The voltage
> from the motherboard connectors for the RA motor reads about 0.1V. Any
> thoughts on what I might try next?
>
>
Greg,
Another thought came to mind on this subject. It's just possible that the
motor is actually getting power, but that it's not being told to move, but to
stay where it is.
You could check this by taking the green strip off of the gearbox and
exposing the plasitc gears. Then, with your finger, just reach inside and try to turn
any of the gears. If they spin freely, you're correct; there is no power to
the motor. If however, they won't freely turn, then they are being held
detented by the motor control circuitry and power is indeed being applied as needed.
I'm not sure what this is going to tell us <G>, but at least we'd know if the
problem is that the motor is or is not actually getting power to it.
Just a little tidbit, for what it's worth.
Bruce Johnston
<http://members.aol.com/ccdastro/astronomy.htm>
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<HTML><FONT FACE=3Darial,helvetica><HTML><FONT SIZE=3D2 PTSIZE=3D10>Snip</F=
ONT><FONT COLOR=3D"#000000" BACK=3D"#ffffff" style=3D"BACKGROUND-COLOR: #ff=
ffff" SIZE=3D2 PTSIZE=3D10 FAMILY=3D"SANSSERIF" FACE=3D"Arial" LANG=3D"0"></=
BLOCKQUOTE><BR>
<BR>
<BR>
</FONT><FONT COLOR=3D"#000000" BACK=3D"#ffffff" style=3D"BACKGROUND-COLOR:=20=
#ffffff" SIZE=3D2 PTSIZE=3D10 FAMILY=3D"SANSSERIF" FACE=3D"Arial" LANG=3D"0"=
><BR>
<BLOCKQUOTE TYPE=3DCITE style=3D"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT=
: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">The RA assembly appears to be w=
orking properly. I used Bruce Johnston's<BR>
technique for applying power to the motors and electronics. The motor=20=
runs<BR>
and the output of the comparators looks normal. Is it possible that I=20=
could<BR>
have damaged the motherboard when I reversed the connector? The voltag=
e<BR>
from the motherboard connectors for the RA motor reads about 0.1V. Any=
<BR>
thoughts on what I might try next?<BR>
<BR>
</BLOCKQUOTE><BR>
<BR>
Greg,<BR>
<BR>
Another thought came to mind on this subject. It's just possible that=20=
the motor is actually getting power, but that it's not being told to move, b=
ut to stay where it is.<BR>
<BR>
You could check this by taking the green strip off of the gearbox and exposi=
ng the plasitc gears. Then, with your finger, just reach inside and try to t=
urn any of the gears. If they spin freely, you're correct; there is no power=
to the motor. If however, they won't freely turn, then they are being=
held detented by the motor control circuitry and power is indeed being appl=
ied as needed.<BR>
<BR>
I'm not sure what this is going to tell us <G>, but at least we'd know=
if the problem is that the motor is or is not actually getting power to it.=
<BR>
<BR>
Just a little tidbit, for what it's worth.<BR>
<BR>
Bruce Johnston<BR>
<http://members.aol.com/ccdastro/astronomy.htm><BR>
</FONT></HTML>
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