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Subject: Re: [M]: Sporadic "runaway DEC"
From: Taras R. Hnatyshyn
Reply To: mapug@shore.net
Date: Mon Jun 11 18:53:29 2001
|
While you're here, how about checking out the
Astronomy Book
List ? |
If the problem is the encoders, a temporary solution may be to cut
down the slew rate to a number lower than 8. I usually try to set
my slew rate to 5 so that the scope doesn't slew as fast on the
go to's. Try setting this number lower and see if the problem goes
away at the lower speeds. Also, try your manual slewing at top speed
and see if the problem appears then.
Taras
On Monday, June 11, 2001, at 12:53 PM, mapug-digest wrote:
> Date: Mon, 11 Jun 2001 12:50:07 EDT
> Subject: Re: [M]: Sporadic "runaway DEC"
>
> - --part1_122.26be1e.285650bf_boundary
> Content-Type: text/plain; charset="US-ASCII"
> Content-Transfer-Encoding: 7bit
>
> In a message dated 6/11/2001 9:19:54 AM Central Daylight Time,
>
>
>>> When I aimed at the Mars by slewing myself, and tracked, I
>>> tried moving in declination--did not seem to both the
>>> motor. Ditto on the moon, I "panned and scanned" up and
>>> down, no problem with the motor. So it appears to be a
>>> sporadic problem, related to the goto function?
>>>
>>> Any suggestions (I'll be searching the archives, but if
>>> anybody has a concise suggestion, I'd appreciate hearing
>>> from you!).
>>
>
> My 10" LX200 has a DEC problem, (~2months old) and is being repaired on
> factory warranty at the moment. It got erratic, even when not being
> slewed.
> One of the things we discovered by inspection was that a small voltage
> regulator on the DEC board was running too hot to leave ones' finger
> on. The
> output voltage was 4.8 volts, and we believe it is supposed to be 5
> volts. If
> one cooled the regulator with a drop of alcohol, it went to 5 volts.
> What I
> was seeing was poor DEC behavior when ambient was above 20 degrees. I
> would
> be very interested to know if your regulator is running hot. It is a
> small
> plastic package, looks like a transistor, mounted just inside of the IC
> on
> the DEC board. Anyone else know anything about this? Doc?
>
> Best regards, Fred Brandeberry
> PS. Haven't had a chance to look for the type of bearings in mine
> yet.. :-)
>
> - --part1_122.26be1e.285650bf_boundary
> Content-Type: text/html; charset="US-ASCII"
> Content-Transfer-Encoding: 7bit
>
> <HTML><FONT FACE=arial,helvetica><FONT SIZE=2>In a message dated
> 6/11/2001 9:19:54 AM Central Daylight Time,
> <BR>
> <BR>
> <BR><BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid;
> MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">>When I
> aimed at the Mars by slewing myself, and tracked, I
> <BR>>tried moving in declination--did not seem to both the
> <BR>>motor. Ditto on the moon, I "panned and scanned" up and
> <BR>>down, no problem with the motor. So it appears to be a
> <BR>>sporadic problem, related to the goto function?
> <BR>>
> <BR>>Any suggestions (I'll be searching the archives, but if
> <BR>>anybody has a concise suggestion, I'd appreciate hearing
> <BR>>from you!).
> <BR></FONT><FONT COLOR="#000000" SIZE=3 FAMILY="SANSSERIF"
> FACE="Arial" LANG="0"></BLOCKQUOTE>
> <BR></FONT><FONT COLOR="#000000" SIZE=2 FAMILY="SANSSERIF"
> FACE="Arial" LANG="0">
> <BR>My 10" LX200 has a DEC problem, (~2months old) and is being
> repaired on
> <BR>factory warranty at the moment. It got erratic, even when not being
> slewed.
> <BR>One of the things we discovered by inspection was that a small
> voltage
> <BR>regulator on the DEC board was running too hot to leave ones'
> finger on. The
> <BR>output voltage was 4.8 volts, and we believe it is supposed to be 5
> volts. If
> <BR>one cooled the regulator with a drop of alcohol, it went to 5
> volts. What I
> <BR>was seeing was poor DEC behavior when ambient was above 20 degrees.
> I would
> <BR>be very interested to know if your regulator is running hot. It is
> a small
> <BR>plastic package, looks like a transistor, mounted just inside of
> the IC on
> <BR>the DEC board. Anyone else know anything about this? Doc?
> <BR>
> <BR>Best regards, Fred Brandeberry
> <BR>PS. Haven't had a chance to look for the type of bearings in mine
> yet.. :-)</FONT></HTML>
>
> - --part1_122.26be1e.285650bf_boundary--
>
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