Sponsored By:
[index] [month] [prev] [next] [thread-next]

Subject: A Problem ? You Be The Judge !
From: Robert Fields
Reply To: mapug@shore.net
Date: Fri Nov 24 08:48:25 1995

---=== So just what is the problem ? ===---

I've checked both of my LX200s and guess what, they both have retrograde
DEC motion in guide mode. This motion is not affected by balancing, and also
occurs when the power is off and I do a manual adjustment. It appears to
be mechanical issue and not the electronics.

Last night I thought, there's no way that I own the only two LX200s in
the world that exhibit this retrograde motion. This morning I got a
message from another person who is having the same problem.

I've contacted Meade tech support and John Piper called me back the same
day. He was quite helpful and said they don't know what would cause these
sypmtoms and that the engineers are working on it.

The folks on this list have been great at helping Meade to identify
problems with the LX200. I think we've found another one worthy of
investigation.

---==== Here's how you can help out ===--

If you have an illuminated reticle eyepiece and a wedge, you can help out.

Just point your scope to a star, align the cross hairs with the RA and
DEC axis, center the star and then put the scope in *GUIDE* mode. Move
the star in one DEC direction until it is sitting on the cross-hair. Then
reverse the DEC direction and see if it responds and goes the direction you
just pressed, or momentarily continues in the previous direction. Repeat
the process using the opposite direction.

I would suggest that you first try this with the backlash correction set
to zero, as the retrograde motion is more apparent. The backlash "jump"
can mask the retrograde motion to some degree. Then play with the backlash
setting and see how it affects things.

NOTE: You scope must be in Equatorial mode for this test. AltAz setting
drives the motors differently and really doesn't apply as long period
guiding is always done in EQ mode - at least for the most common 8", 10"
and 12" models.

Many thanks to anyone who can participate !

-Robert

View index by [date] [author] [subject]
Previous message: Re: HPP calculations, still! -Reply, Mark Taylor
Next message: Image Shift Revisited, sam lattuca
Next message in thread: Re: A Problem ? You Be The Judge !, Jason Ware