|This page is for user comments and information specific to the Meade ETX-90RA (originally known as the "ETX Astro"). Comments on accessories and feedback items appropriate to other ETX, DSX, and DS models are posted on other pages. If you have any comments, suggestions, questions or answers to questions posed here, e-mail them to me for posting. Please use an appropriate Subject Line on your message per the Site Email Etiquette. Thanks. Remember, tips described on this site may invalidate the warranty on your telescope or accessories. Neither the submitter nor myself are responsible for any damage caused by using any contributed tips.|
Subject: Lithium Grease Sent: Tuesday, December 28, 2010 00:36:09 From: George Layburn (firstname.lastname@example.org) After all those 3 way emails, you two guys are obviously awesome. Mike I haven't done anything yet, and if you remember me I am the guy who asked for advice on the Microstar II, Maybe Dr Clay knows the answer to that one. Dr Clay, the Microstar II, you familiar with that thing? I have a question for you about it. I wont ask it now. Are you familiar with it? Mike the question is for you, I do this both the Microstar II problem, my wife the mechanical engineer is going to look into the the best lube for the plastic hubs. ( What is the deal on the Lithium Grease, I keep seeing that mentioned) I have a first generation ETX remember not the computerized version. The mictostar II sticks when trying to raise the scope. That's insignificant compared to this issue of that secondary mirror baffle fix. But these two fixes should I document everything pictures and all, step by step. And post it on your awesome site after it's done and all works well. "Hopefully" Should I do that? I will do a great lab report. My wife will do the grammar check, before I post it. :-) All goes well, and I have a fully functional ETX-90 again, maybe I can give a I did that and it worked, you can do it too advice article. You know for the few people that still use the original ETX-90. GeorgeMike here: Lithium grease is frequently mentioned as the preferred grease for the ETX lubrication.
Works for me, solves that problem.
Subject: ETX 90 Sent: Saturday, December 25, 2010 14:02:21 From: Clemente Cuevas (email@example.com) I recently received a used ETX 90 (not the autoguided). I like the little scope. Can someone tell me the dimension of the 3 legs? I am going to purchase some threaded stock and cut them to length Thanks ClementeMike here: I'll measure mine and let you know. Once I find them.
Thanks I live in Orlando, FL lat 28.31 Again Thanks ClementeMike here: That would be approximately 41 cm. Be certain to allow for some adjustment of the leg; the scale is not that precise.
Subject: ETX Question Sent: Tuesday, December 21, 2010 23:49:04 From: George Layburn (firstname.lastname@example.org) Big fan of your ETX page for years now. I have the Microstar II added to it, as best as memory serves it used to work great but it has been a few years since I last used it and I decided to tune it up and use it again. I have a problem with the Dec. motion when raising the scope. Lowering is no problem, but raising it sticks the motor spins but no movement on the Dec. Knob. I have taken apart the tube fork mounts even greased all of the moving parts in the hubs. It used to work fine as I recall, do you think now being an older scope, would you recommend scraping/sanding the internal arm that rides on the Dec, bolt might fix the problem? I would greatly appreciate your advice. Thanks in Advance George Layburn Clay, NY.Mike here: If you turn the DEC knob manually, can you feel any resistance? If so, then the problem is likely with the shaft. However, if you don't feel any resistance, then the problem could be with the rubber O-rings; they could either have stretched or become slick and so slip on the metal knob. I have a similar problem on my ETX-90RA. The O-rings slip. One of these days I plan to replace them.
Thank you for your response to my question, I don't have any resistance on the threaded shaft. I did grease the hubs that holds the scope, I think that may have been too much. I cleaned everything up and used just plain oil, I hope that fixes it. I am still working on that. But I have another question and then I will leave you alone. On the Microstar II their are the potentiometers for setting the speed of the motors. The adjustment for the R.A. motor does changing that alter the actual "tracking speed" as when following an object, or does that alter the Fast Forward/Rewind speed. I don't want to alter the "tracking speed" it works perfect. But if I can speed up the searching speed that would be neat, I am hesitant to touch that adjustment. Is the tracking speed independent of that potentiometer? I hope I phrased my question correctly. Thank You In advance, and I will leave you alone. I bet you get lots of emails. George Layburn P.S. Again love the web page, totally rocks. Crying shame that Scopetronix went out of business. Love the Microstar II, and the Zoom eyepeice. among other things I bought from them.Mike here: The "pot" on the handcontroller controls the focusing speed. Tracking speed is not affected.
No, I am talking about the pots on the printed circuit board mounted inside the base of the scope. Their are two one for the R.A. motor one for the Dec motor. I wasn't talking about the hand controller.Mike here: The RA pots "might" affect the tracking speed. The DEC one won't. Someplace I have the documentation that came with the Microstar II+ but after all my moves, I'm not certain where it is.
Hey, Thanks a lot for checking it out. I think I am just going to leave that circuit board alone, if it ain't broke don't fix it. Right!
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