Question about Meade 8" LX90 Schmidt-Cassegrain Telescope non-UHTC w/Autostar Suite-LPI - MEA 0810-90-40

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When i turn my LX-90 8" telescope the GPS is not working.

I was told to go to reset the Autostar. What do I have to do after I hit the rest tab? W hat do I have to enter and where, if anything?









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  • alarson400 Dec 30, 2008

    What all do I have to enter.if anything, after I have hit the reset?

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After you RESET the telescope-- it returns to factory default settings--

1. Calibrate Motors

2. Train Drives

3. Set Time, Date, Site, and Daylight Savings Time to NO right now in USA

4. Calibrate Sensors on Polaris

5. Do an Automatic Alignment--

Here are all of Meade's manuals on line--
http://www.meade.com/manuals/index.html

Posted on Jan 11, 2009

  • Joe Lalumia aka TelescopeMan

    Also go to www.cloudynights.com and ask questions on the LX forum-- Clear Skies

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I bought a used etx90 with autostar. The scope works with the basic controler. When I plug in the autostar it beeps & lights up the number panels, but I can't see anything in the led screen. is...


The contrast and brightness can be reset --- here is the manual -- how to do this is listed in the manual. If this does not repair the controller then you will need to buy a new hand controller-- the 497 hand controller is available used on Ebay from time to time.

http://www.meade.com/manuals/TelescopeManuals/ETXtelescopes/ETX-90%20w-autostar%20man.pdf

Manual down load above--

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1 Answer

I have an older, let's say "classic" LX-90. My


You can try Three things:

1. Do you have fully charged batteries-- or a good power supply.

2. Sometimes the cable to the hand controller needs to be replaced

3. Execute a RESET on the hand controller and reload the firmware--

If these do not fix it, the hand controller is defective and must be replaced. You can find a used 497 controller for about $80 on AstroMart.com

and Meade can also sell you a new one.

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I am using an LX 200 GPS gimbal with no autostar control hand box. I want to be able to talk to it using my Autostar Suite and a computer. I have the USB to RS 232 cable and the connector to go from the...


1. Plug the cable into the BOTTOM of the hand controller-- NOT into the control panel.

2. Set the software to the proper COM port. Look under Telescope in the dropdown tab.

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I have an older Meade LX200 GPS with autostar II handset. The telescope was working fine and last night I got an error message on the handset "Error: Inv. Heap" and the telescope locks up with no further...


You may have Corrupted firmware in the hand controller- that's why they want you to do a RESET.

You might have to reload the correct firmware to fix this problem.

I believe if you hold down the ENTER KEY and the SCROLL DOWN arrow key and then turn on the scope you enter SAFE LOAD where you can reload the firmware.

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1 Answer

Inability for the telescope align


Replace the battery for the GPS.

Start from scratch.

Reset the hand controller, calibrate motors, train drives, calibrate sensors.

Make sure you have either fresh batteries, or better a seperate 12 volt power pack. The above will eleiminate everything except an actual BROKEN electronic part (such as a bad gps board).

If it still will not align using the gps, time to send it back to Meade for repairs. Make sure you have the latest firmware in the hand controller which is 43Eg. You can download the firmware using the UPDATER free software here:
http://www.meade.com/support/downloads.html

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1 Answer

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Your reseller is correct. The wire (Meade cable #505) goes from an RS232 serial port on PC to a 4pin RJ plug. This plugs into the 2nd socket on the bottom of an Autostar 497 handset, the other socket being used for the curly lead to the telescope. So it goes PC to Autostar to telescope.

A common error is to try plugging the serial wire into an "AUX" ort on the telescope control panel - same connector. Not only does this not work, it can cause a lot of damage.

Wired like this you can control the scope from Meade's Autostar Suite (or many other planetarium softwares). You can also update the Autostar software to the latest 2009 version.

What else can go wrong? Well, many people want to control from a laptop, and modern ones don't have RS232 serial ports. Then you need a USB-to-serial convertor dongle, which effectively add a serial port to a laptop. But they often give it a very high port number (eg COM17) that the planetarium software does not find. Use Control Panel to reset the USB-serial-port to COM 1, 2, 3 or 4 and all should be well. But it can be a right fiddle!

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1 Answer

Meade LX 90 AutoStar problem


One thing you can do is to completely reset the controller and reinput everything back into it.
If that doesn't work then you need a new hand controller.

It would be nice if you can take it to a local telescope shop and have them try your controller on one of theirs.
Tom Net

Mar 05, 2008 | Meade 8" LX90 LNT Schmidt Cassegrain...

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