An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 500 times.
Re: ETX90 power supply
The center pin is positive & you will need a minimum of 1200 mA.
Here's a link to a great site with lots of good information:
Please update the question & let us know if the information given was useful to you - Good Luck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
The ETX90 may not have enough back focus for a 1.25 to 2 inch adapter. You will need 1.6 in extra focus. (Try putting a eyepiece barely in the holder and see if you can focus CAREFULLY!) a 56mm eyepiece will seriously vignette since the opening of the scope is only 1.25 inch so do not expect a wide field. Link below is for an adapter http://agenaastro.com/blue-fireball-1-25-2-eyepiece-adapter.html
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.
Yes, uploads available at Meade's website. You will need their downlaoder program (there as well). NOTE: the operation can take about an hour, so run the telescope on external power so it doesn't run out.
Well, when I got the unit, indeed it would not power up at all. I could see no burning or signs of arcing.
I looked online for an internal picture of the drive and fitted the cables back in according to the image.
Tadahhhh, one working drive, only works on the 12v though, Batteries wont work although I have measured the voltage and they are all fully charged. Seems the previous owner had removed the looms and put them back incorrectly.