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

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LX90 Dec pointing out by 4 degrees over run

Hi All

LX90 (non GPS). The DEC is always pointing almost 4 degrees out. This was the result on a RA 180 degree DEC 80 degree test, The RA is spot on 180’ but the DEC is almost 4 degrees out each time. On the first motor stop, the DEC is spot on the 80', when the RA has completed is run the DEC will then creep on another almost 4'. I have found that on a LX90 that is working correctly that the RA stops almost 4' short of 180 and the DEC stops almost 4'short of 80'. then both drives will creep up to the correct settings 180' and 80'.
I have done a flash reload of the firmware, changed the handset for a known correctly working one and changed the motor set. The problem is still there. I suspect that the driver card is faulty but cannot obtain one in the UK.

Has anybody got any ideas that may help me?

Regards

Rick

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Go onto www.cloudynights.com and post this in the LX member forum-- and or go on YAHOO groups and post this in the LX90 forum--

Are you absolutely sure that your TIME and DATE and DAYLIGHT SAVINGS (yes-no) are correct.

On my LX90 the first alignment star is always NOT in the eyepiece but everything is OK once I center both alignment stars.

Posted on May 15, 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.

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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

Can you describe how to use RA and DEC to find objects. I can find the planets ect....


Once the scope is polar aligned move it to a named star that you can identify. Look up the RA and DEC for that NAMED star in any planetarium phone APP or a laptop running any planetarium software like the free software available at www.stellarium.org

Adjust the circles to MATCH the RA and DEC in the planetarium software, and lock them down.

Now you can use them to find other objects of known RA and DEC.

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1 Answer

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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1 Answer

I have a CPC11GPS telescope that was working the last time I used it, which was 6 months ago. It is in NEW NEW condition. I pulled it out last night, turned it on, allowed the system to align itself using...


The clutch is not engaging in RA. Maybe the gears are not actually meshing together? A loose worm gear?

You can open it up and look and see if anything obvious is loose. Otherwise it's a trip back to Celestron.

Dec 04, 2009 | Celestron Optics

1 Answer

The dec, knob must have streped on my 2000 LX90.


Look at this for a possible fix--

http://www.scopestuff.com/ss_ezck.htm

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1 Answer

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Go back to square one-- in this order

RESET the hand-controller
Calibrate Motors
Train Drives in BOTH axis
Enter Time, Date, and Site-- Daylight Savings NO -- right now in the USA
Calibrate sensors (if you have this option)

Then do a two star Automatic alignment-- you will need to CENTER each alignment star and they may NOT be inside the eyepiece but nearby.

Here is a manual-- http://www.meade.com/manuals/TelescopeManuals/LXseries/LX-90_manual.pdf

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1 Answer

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Most problems tend to be mechanical. Have you 'trained' the drive and set the backlash values? Those 2 can have dramatic effects on pointing accuracy. Also, if the optical tube is not in alignment with the mount, then nothing will work correctly. To check that, have the telescope in Alt-Az configuration, inside the house, loosen the RA lock, and shine a laser pointer on the corrector plate. as the telescope is rotated about the RA, the reflected spot should be steady. Adjust the DEC to minimize the diameter of the circle that is drawn. What is left, is the out-of-true on the DEC axis. That can be adjusted with the tube cradle alignment bolts.

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1 Answer

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My scope sat in a basement for years and when I started it up I got an error the same as you discribe. Through sear luck I found it to be a bad connection where the encoder wire pluged into the battery box.

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