Question about Discovery Channel Meade 8" LX90-GPS Telescope with UHTC

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Elevation motor stopped working....

My lx90 scope was working fine until the other night and the elevation motor stopped...the hand box indicated that the motor was not working.
I reset the system, and the elevation motor worked erratically, on, off, on, off....so I reset it again, and now no elevation motor function at all. The rotational motor (azimuth?) works ok... all speeds ok, but the altitude motor won't function.
I would like to get a hold of a break-away parts diagram and any help to get this motor running again.

wpyles@insightbb.com

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You might look at the Jan's Meade lx90 site.
http://hometown.aol.com/kewtasheck/index.html
I have the same problem.

Posted on Sep 07, 2008

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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

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Meade lx-90 dec printed circuit board bad. where


Since you already disassembled the scope-- you can send the board to Ron Sampson and he should be able to repair it. He fixes main boards and hand controllers (including the screen and keyboard on the hand controller!)

If you post a message on the Yahoo LX90 group looking for Ron Sampson he will answer you. You can then email or phone him for instruction on how to send him the board.

ARE YOU SURE it's the board? It could be a bad keyboard or a bad cable on the hand controller. You should get another hand controller and cable and test it before you send it off. Can you borrow a hand controller and cable from anyone.... or from a local scope retailer?

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This is called "rubber-banding". Your scope needs to be re-trained.

So, setup a target during the day at least 100 feet away from the scope (200 feet would be better, Calibrate motors using the same power source you use at night, and Train Drives. Later after dark, do a Calibrate sensors on Polaris.

You should train drives about once per year, and calibrate sensors about twice per year.

You may want to update the firmware before you Train Drives. The latest version is 43Eg available on the Meade.com web site. You with need the Autostar Updater Software also available on the Meade web site under Customer Service---- Downloads. Version 5.9

www.meade.com

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1 Answer

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Start from scratch-

RESET the hand controller.

Calibrate motors using the same power source you will use outside.

Re-train the drives

Calibrate sensors on Polaris

Use either the 110 volt power cord, or buy a 12 volt power pack and the proper Meade 12 volt cable. (www.scopestuff.com carries the right 12 volt cable)

If your scope is NOT the LNT or GPS model you must level the tripod before you align. Go to home depot and buy the $3 small plastic two way bubble level, or the bulls-eye style bubble level.

Further trouble, I suggest going to the LX90 Yahoo group forum, and asking questions there.

Good Luck

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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.

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Locking screw


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:
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Instruction manual for 1970's custom .22 scope with BDC


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1 Answer

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If the hand controller on the LX6 has stopped working you have a problem since meade does not support this very old telescope. My only suggestion would be to place an ad on www.astromart.com looking for a new hand controller.

If the error message indicates a "motor fault" make sure you have a good power supply and or fresh batteries-- as low voltage will cause a motor fault error.

Later you said it was an LX90 LNT-- ?? so which scope do you actually own???

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I ended up replacing the Hand Controller with a new one.
After that it started working. I brought the new one on E-bay.
They seem to have the best prices. Forget about talking to Meade. Their innate ability to reply to your phone calls or emails just doesn't work. I will ***** buy a telescope from them again.

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