Question about Meade ETX-90EC (325 x 90mm) Telescope

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Focus knob wont work juat spins setscrew is tight whats up?

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The gears could be stipped inside the scope. Make sure the shaft isn't broken also, when you take it apart to inspect it. If you find a damaged gear or broken part, contact Meade to see if that part is available. If you have trouble inspecting the unit to find the problem, you could take it into a camera repair shop, and see if they can assist you in determining the problem. Here's Meade's support site:
http://www.meade.com/support/auto.html
Good luck, and hope this helps.

Posted on Mar 20, 2011

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1 Answer

How to tighten kwikset #991LL


Remove inside lever by loosening the setscrew and pulling. Carefully pry off the inside cover. Make sure both screws are tight. Replace inside lever. With door unlocked, the outside lever can be removed in the same way as the inside. All that is necessary though is to be sure the setscrew on the outer lever is tight. Check to be sure the lock is tight and operating correctly before closing the door and locking it.

The deadbolt inside turnbutton is held on with a small setscrew. Remove it and the inside cover. Be sure the screws under the cover are tight. Check the lock operation, replace cover and turnbutton.

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1 Answer

Inner part of focus knob spins freely, can't remove to service microscope!


YOu need a spanner wrench, they are a jewelry or photography technician item. Look on EBAY for them, they are cheap

Jul 27, 2012 | Science & Laboratory

1 Answer

Focus knob turns but nothing moves


The Celestron manual for this scope has nothing to say, but on the underside of the focuser assembly, between the 2 focus knobs, you may see 2 screws.
They might be thumbscrews or some other screwhead type. One is the adjustment for the focuser internal clearance, or looseness, and the other is a focus travel lock.
If present, try backing both off 1/2 turn from tightness, and then experiment to see which is which. The focus lock will have no effect until tight, when the focuser will cease moving, as is now. The other screw will gradually remove looseness and rattle from the focuser until it just moves smoothly, with no back and forth loose feeling at the knob.
If neither of these screws is visible you will have to take it to a binocular and telescope shop, where they should not charge much.

May 02, 2012 | Celestron Optics

1 Answer

Focus knob just backs out of unit


There is a tiny setscrew on the side of the knob. Tighten this screw and the knob will stay on the rod coming out of the scope.

www.telescopeman.org
www.telescopeman.us

Sep 15, 2011 | Meade ETX-90EC (325 x 90mm) Telescope

1 Answer

HI, Just purchased a nextstar 8 and when I tried to view thru the main eye-piece, nothing. Even tried to look at the full moon, nothing again. Yes, all the lens caps are off but it seems like the focas...


Check the focus knob and make sure the small "set-screw" is tight and the knob is just not spinning around on the shaft.

DID you turn the knob enough to focus? Sometimes it may take 10 - 20 full turns.

Finally the focuser is attached to a "rod" inside the tube that moves the mirror back and forth to focus the scope. It could have come loose from the rod?

Instructions for disassembly are here:
http://www.celestron.com/c3/support3/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=2220

and here:

http://www.sciencecenter.net/hutech/misc/focuslk/index.htm this just shows how it works.

Oct 24, 2010 | Celestron NexStar 8i (600 x 203mm)...

1 Answer

Just got a Meade ETX 90 and cannot see anything thru the eyepiece. I've tried the focus screw, lens covers are off, and flip switch is in correct position. Anyone know the answer?


Put the eyepiece with the largest number written on it into the TOP of the scope eyepiece holder.

Practice focusing on a distant object during the daytime. It may take several turns of the focuser know.

Also check the TINY setscrew on the side of the focuser knob. It may be loose and need tightening so it will GRIP the focuser shaft.

Aug 19, 2010 | Meade ETX90AT Maksutov Telescope with UHTC...

1 Answer

My focus knob does not work correctly, is this easy to fix?


There is a tiny set screw on the side of the knob. Make sure this is tight, and the knob is not just spinning around and around.

There is also a small rod inside -- that the focuser attaches to. If tightening the setscrew does not fix it, you will need to remove the focuser and see if it is detached from the rod. Make sure the scope is tilted BACK with the front of the scope UP a little or the mirror will slide to the front and possibly break.

This web site has lots of repair pictures--
http://www.weasner.com/etx/menu.html

Aug 09, 2010 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

Focus knob problem


have repaired a few of these ...some whells have tiny set screws to tighten, some are a two piece wheel that loosens up sometimes, if not that then it is broken. if i can be of further help...15088331232

Apr 26, 2009 | Optics

1 Answer

Right ascesion slow motion control knob loose, does not work


The RA knob has a setscrew that fixes it to the shaft. Just need to find the correct size and tighten.

Jul 06, 2008 | Meade LX200GPS Telescope

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