Meade ETX90 will not tilt; Motor runs, but gears just grind.
Before tearing it apart, I would like to know what I am getting into. Is there a repair manual available out there somewhere? Are these gears relatively 'cheaply' made plastic gears, and can parts be purchased for it? If so, where? Thanks in advance.
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Re: Meade ETX90 will not tilt; Motor runs, but gears...
I have not been able to find a repair manual anywhere. Nor have i been able to find any repair parts. Dr. Clay Sherrod at the Arkansas sky observatory offers a repair service that is apparently so good that it will increase the value of your scope, it is however expensive. here is the link. www.arksky.org/supercharge.htm
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You cannot actually get parts for this scope other than from Meade directly-- and possibly a USED motor on Ebay. Usually Meade wants you to send in the scope for repair and will not sell you any gears or motors.
You can send this into Meade for repairs. http://www.meade.com/support/index.html
Or you can disassemble the base and look inside. I suspect you have either a loose or broken worm gear inside the base. There are manuals available on the Meade web site but they do not give any disassembly instructions. Call Meade at the phone number above or try taking apart the base and look inside. Only Meade will have replacement parts.
The Meade ETX90 does NOT have small lens! It has a large curved lens in the front. and a holder for the eyepiece in the back (top). There is also a camera port in the back, and a flip lever that sends the light either straight back to a camera, or UP to the eyepiece holder.
There is an INTERNAL secondary mirror mounted on the back of the front large lens. If this fell off INSIDE, you will need to remove the front lens to fix it. NOT an easy fix as the optical alignment can get messed up when you do this.
Here is the manual for an ETX90, you should read it completely.
motr coupling easy to turn??? did you look at closle ( sometimes appears intact, but the center of teh shaft is stripped allowing the motor to "slip" through giving what could amount to a stripped gear sound. the newest motor couplin (285753a) has a meatal sleeve to prevent such a thing from happening