Question about Meade 8" LX90 LNT Schmidt Cassegrain Telescope with SmartFinder w/ FREE UPS

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Locking screw elevation dec locking screw on the fork arm has came loose cannot refix

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You will need to check out the clutch mechanism in the fork arm. Refer to this web site for disassembly pictures.

http://jan.eaglecreekobservatory.org/

Look under Declination adjustment link off the main page.

www.scopestuff.com
sells an upgrade clutch kit that improves the clutch. However if something is broken inside then this must be fixed first. Meade will want the scope returned. They usually do not sell parts; but sometimes they do sell them, so call Customer Service here:
http://www.meade.com/support/index.html

Posted on Dec 04, 2009

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I have an older meade LX2000 EMC 10


The main problems encountered with the mechanics of the telescope centre around the mechanical swarf, grease compound, the liberal use of grease and the quality of machining of the main DEC and RA gears.
1. Remove the motors from the telescope. Be careful when removing either motor as there is a compression spring between the motor mounting frame and the worm shaft assembly.
The RA motor is located under the telescope body, removing the 4 screws and 2 Allen bolts will allow the bottom cover to be removed, thereby allowing access the the 2 Allen bolts holding the motor in place. Unplug the motor from the main PCB before removal.
The DEC motor is in the the fork arm containing the clutch and fine DEC adjustment control. (Never to be used with power applied to the scope). Remove the 3 small Allen screws holding the plastic cover plate in place and the DEC clutch knob to allow access to the motor. Remove the RJ45 connector located inside the telescope fork arm. Then remove the motor by unscrewing the 2 Allen bolts holding the motor in place.
2. Remove all grease from the motor worms, especially around the RA motor's magnetic pulse detector and the permanent magnet built into the worm shaft.
3. Remove all grease from the main DEC and RA gears, making sure to clean into the gear teeth.
4. Lightly re-grease with a Molybdenum Disulphide based grease (Castrol MS3 is great for this application if you can get it)
5. Assemble in reverse order. But before doing so, carry out the electrical adjustment above then, (a) relocate the the RA and DEC control PCB's in the vertical plane thereby gaining access to their respective backlash Allen screws. Adjust for 20thou max clearance when in final position. Note:- the DEC adjustment screw has to be replaced for a longer unit complete with a thin bolthead as this adjustment has to be carried out with a spanner....there is no room for an Allen key adjustment here.
6. A drop of Loctite must be applied after adjustment.
7. The final part of the process is to run in the gearing. Apply 12 volts to the motor wires, either at their respective plugs or to the motor direct. Allow to run for 2 to 3 hours in each direction by reversing the battery polarity to bed the teeth engagement. Remember to release the clutches.

Dec 28, 2011 | Optics

1 Answer

Hi Joe, My name is also Joe and I just bought a Celestron AstroMaster 114 and need a hand with the elevation,inclination, declination settings(what should my gauges be set to) to star using the unit. Any...


Your DEC is the same as your Latitude--

Right Ascension does not matter for now. Polar Align the scope on the star Polaris-- read this:

http://arnholm.org/astro/polar_alignment/index.html

Once you are polar aligned, rotate the tube to a star in the sky that you KNOW the name of. Look up the Right Ascension of that star on a cell phone app or a laptop planetarium program like this one:
www.stellarium.org

Rotate the RA setting circle so it matches what the phone or laptop indicate. LOCK down the RA circle. Your scope is now adjusted to the sky and you can use the numbers on the DEC and RA to find other objects of known RA & DEC.


www.telescopeman.org
www.telescopeman.us
www.telescopeman.info

Sep 02, 2011 | Celestron AstroMaster 114 AZ (50 x 114mm)...

1 Answer

I have a Model 155w Altazimuth Refracting Telescope. It will not mount on the tripod. I believe I am missing a piece, but I don't knoe which one.


There should be a screw hole in the bottom of the tube and or two screw holes one on each side of the tube.

In the first example all you need is a photo tripod and screw the tube on it-- in the second you are missing the "fork arms that attach to the telescope -- like this picture:

http://texasastro.org/images/mounts/cheap_mount.jpg

Jan 24, 2011 | Meade Optics

1 Answer

The vertical movement will move down but not up with the auto star controller when you try to move it up it makes a clicking noise


The DEC gears are slipping and not engaging. You must disassemble the fork arm to fix this-- not very easy to do.

Meade will repair this if you return the scope to them. Here is their service phone line:
http://www.meade.com/support/index.html

Dec 21, 2010 | Meade ETX-125EC (500 x 127mm) Telescope

1 Answer

M eade lx200emc age not known movement on


The worm gear could be loose inside? or the clutch has grease on it.

There is a DEC repair kit available on scopestuff.com here:

http://scopestuff.com/ss_ezck.htm

Feb 09, 2010 | Meade LX200GPS Telescope

1 Answer

Bolt holding dec drive motor on 16 loosens.


You have a LARGE Meade telescope. This should be an easy fix if you can disassemble the fork arm and get inside.

First I would contact Meade customer service to see if they have a manual that shows disassemble instructions. If not I would join the Yahoo LX200 forum and look for help there with an owner of the 16 inch model.

http://www.meade.com/support/index.html

Just search in Yahoo Groups for the LX200 forum.

On smaller scopes the DEC motor is held on by two spring loaded bolts, probably one has become loose?

Nov 04, 2009 | Meade LX200GPS Telescope

1 Answer

Backlash on scope tube meade lx90


The washers are there for a reason-- there is an adjustment screw for the worm gear-- and the Dec axis works off a friction clutch when you tighten the knob on the fork arm.

Are you talking about the center bolt on the tripod that holds the telescope on the tripod-- ??? If you overtighten this it will interfere with the rotation of the telescope....and can break the motor.

Here is Jan's LX90 web site with disassembly instructions and pictures--

http://jan.eaglecreekobservatory.org/

Apr 02, 2009 | Meade 8 2000mm f/10 LX90 LNT Motorized...

1 Answer

ETX125 PE new model. Elevation has totally stopped.


Could be that the DEC motor driver has died. That could be verified by swapping the connections between the RA and DEC. If the DEC now moves, then that is the problem. If not, then the DEC motor is bad.

Nov 17, 2008 | Meade ETX Premier Edition: ETX105 PE...

1 Answer

Meade telestar D=130 mm F=1020 mm


rosores: make sure that the DEC clutch is not locked, and that the screw on the side bar is loose.
before pointing it upwards. or damage may occur.
STH55

Sep 04, 2008 | Meade TeleStar 60AZ-A Telescope

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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