Question about Meade LX200GPS Telescope

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Mirror lock The mirror lock won't unlock. The large gear that engages with the gear behind the mirror lock knob will not rotate. If you turn the knob counterclockwise the knob will back off away from the plastic flange, and if you turn it clockwise, as if to unlock the mirror, the knob will return toward the flange but then it stops and you can't turn it any more. If I unhook the coarse focus knob then the mirror lock gear will turn freely, but the mirror turns with it.

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1 Answer

I just had my lx 200 acf 12 inch [new telescope] returned to me from Meade because there was dirt on the mirror. After setting it up I discovered the locking mechanism would not unlock nor could i turn...


You can try removing the focuser and knob -- and see why the LOCK (which is simply a bolt is stuck.

Look here:
http://www.petealbrecht.com/Installing%20Digifocus.pdf

May 21, 2011 | Meade LX200GPS Telescope

1 Answer

Here?s my problem : My scope model is LX200R 14?. I?ve pulled the focuser shaft out of the focuser arm pin. I?ve turned the locking lock knob several turns before putting back the focuser shaft. I...


Steward, this is Joe Lalumia-- I have seen your post on various forums. The 14 inch is different from the other smaller LX200 scopes.

Probably Dr. Clay, and or Andrew on the Yahoo Group LX200 forum will know the answer because they service these scopes.

Post a message there (register for free) and one of them will answer you about that very nice scope.

Clear Skies!

Joe

Dec 14, 2010 | Meade LX200R 14 in. Telescope

1 Answer

My NexStar 8 SE doesn't focus. When the focuser knob is rotated either direction it moves the image up or down.


The knob could have come loose from the mirror. This would require a return to Celestron for repair or a complete disassembly of the rear of the scope,

You can remove the focuser, and MAYBE it is just detached from the rod inside that moves the mirror back and forth.

Celestron support:

http://www.celestron.com/c3/page.php?PageID=37

Aug 01, 2010 | Celestron Optics

1 Answer

I have a Meade ETX-90EC. I cannot tighten the vertical lock to engage the motor. Motor works fine (I think, I can hear it turning) but the knobbed dial just keeps turning (clockwise) and never seems to...


It's a simple solution!
Take the knob off, and use a simple washer, will will hold up in between the plastic and metal surfaces.
This should be your solution!

Aug 07, 2009 | Optics

1 Answer

Focus?


The C8 optical tube has a very large focal range. It should be capable of focusing on objects from 15' to infinity. To focus on object at infinity you have to move the primary mirror foward. You do this by rotating the focus knob CCW. Rotate the knob CCW until it comes toa stop them slowly bring the mirror back by rotating the knob CW while viewing the object. It will snap to focus so don't move too fast yor you'll miss it.

Jun 25, 2008 | Celestron NexStar 4 SE Telescope

1 Answer

Loose image when focusing


The focus knob can have the play reduced. Turn counter-clockwise a turn or 2, then loosen the knob's set-screw and carefully turn clockwise until a little drag is felt. Then tighten the set-screw.
A further item that may pertain to image shift, especially at low powers, is that the baffle tube that the main mirror slides on, may be loose in the back housing. There have been reports of poor thread engagement due to poor tolerences. That tube can be re-tightened - just be careful not to strip the threads!.

Jun 16, 2008 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Telescope knob


Still not enough information, but taking a stab at it, I'll assume you mean the pinion rod that goes between the focus knobs, and engages a gear rack on the focuser. There are locations where they can be purchased, and you would need to provide the OD and pitch (teeth per radian) to match.
Try: http://www.pinionrod.com/ as a source.

Jun 13, 2008 | Optics

1 Answer

Mirror lock


Possibly the shaft has jammed. Follow this link for a source of good information: http://www.mapug-astronomy.net/AstroDesigns/MAPUG/ArhvList.htm

From their files:
The locking knob has a gear on the inside end of its shaft. It engages teeth on the outside edge of a large metal disk connected to the mechanism that locks the position of the mirror on the central baffle tube. Rotating the locking knob one direction rotates the large disk to tighten the collet on the central baffle. Reversing direction loosens it.
The teeth do not extend all the way around the large disk. So sometimes the locking knob gear jams to a stop before the lock is fully engaged. Soon after the GPS scopes first started shipping Buck Harley discovered that in such cases you can remove the locking knob with its shaft and gear, then reach in and rotate the large disk with your finger. Replacing the locking knob will now allow sufficient rotation to fully engage the lock. If you happen to move the large disk in the wrong direction, then just repeat the process and move the disk in the other direction.
You don't need to tighten the lock down hard. Just a little snug is enough. You should not attempt to use the coarse focus knob while the mirror is locked. Damage to the focusing mechanism could result.
This design is intended to precisely hold the mirror position. So, yes, it is meant to allow effective use of a separate guide scope by eliminating mirror flop when in the locked position.

May 26, 2008 | Meade LX200GPS Telescope

1 Answer

Meade LX200R 12" Mirror Lock


The 'lock' is a ring gear that closes a ferrul against the draw tube to restrict its motion. It is not intended to be a hard lock. Try the Meade Advanced Users Group for further tips.
http://www.mapug-astronomy.net/

Jan 20, 2008 | Meade 8" LX90 LNT Schmidt Cassegrain...

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