Guide :Optics : ETX-125EC (500 x 127mm) Telescope

Secondary mirror How do u remove the secondary mirror from an ETX 125. Thanks

Posted by harpazo on Nov 20, 2007

Research, Knowledge and Information :

Weasner's Meade ETX TechTips

Meade does seem to have a quality control problem with respect to ETX-125 collimation. I do want to ... Remove the flip mirror ... secondary mirror and the ...
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Secondary baffle fell on primary mirror! [ETX-125] - Meade ...

Secondary baffle fell on primary mirror! [ETX-125] ... I have a very early Meade ETX-125EC and the secondary baffle has fallen off ... Thanks for the advice! Do ...
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cleaning the secondary mirror of 10" Dob - Discussions ...

cleaning the secondary mirror of 10" Dob. ... Thanks Mick. I am little worried ... But if you do remove it I'd be interested to know how you get on.
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Meade ETX-125AT Telescope w/ Full-Sized Tripod, GOTO AutoStar ...

Please remove a product before adding another one to your comparison view. ... Secondary Mirror Obstruction ... Meade ETX-125AT/ ETX-125 PE Aluminum Hard Carry Case:
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Advice sought fixing off-center LX200 SCT secondary mirror

Advice sought fixing off-center LX200 SCT secondary mirror ... Thanks in advance! ... Next time I remove the secondary assembly I'll pull the mirror ...
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Meade ETX-125AT Instruction Manual. ... Always remove the batteries if they are not to be used for a long period ... Secondary mirror obstruction (dia.; %) . . 27 ...
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Weasner's General Feedback Page

And you would have to remove the corrector plate to get access to the secondary mirror. ... etx 125 thanks to ... do I clean the rear mirror of my ETX ...
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Meade ETX90 Astronomical Telescope - CHUCKHAWKS.COM

Meade ETX90 Astronomical Telescope ... Secondary mirror ... you have to turn off the electronics and remove the telescope and fork mount from its tripod, ...
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Suggested Questions And Answer :

Secondary mirror How do u remove the secondary mirror from an ETX 125. Thanks

Answer would be too long here. See Mike Weasner's site below. Everything you wanted to know but were afraid to ask. I am not promoting, just a member.
Read More At : ETX-125EC (500 x 127mm) Telescope...

The 5-inch dust cover on my Meade ETX 125 is completely jammed on. The threads are not crossed so I suspect it is just due to a build up of dust in the thread prior to its last fitment. I've tried unscrewing it using 2 consenting adults both wearing rubber gloves, but to no avail Do Meade sell a tool to remove the dust cover ... or have you any suggestions? This cannot be an uncommon scenario.

Try heating it up with a hairdryer, and get one of those rubber "mats" that are used to open jar lids.Good luck. This is a common problem. DO NOT overtighten the cover when you get it off.
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Meade ETX-125EC Telescope Problem

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.
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The telescope will not move up and down - Meade ETX-125EC (500 x 127mm) Telescope

You do have fresh batteries? Does the light come on -- on the control panel? Does the hand controller light up?We need more information to answer you-- but for repairs you will need to return it to Meade. Call them here:
Read More At : ETX-125EC (500 x 127mm) Telescope...

Lube stain on Secondary mirror on CPC 1100

Probably lubricant out-gassing which can collect than drip. Your choices are to contact Celestron service or do it yourself. DON"T PANIC! It is not that hard if you are brave. 1. Use a piece of masking tape on the corrector to the side of the housing.slice it carefully where they meet. This will insure correct alignment with the primary when you put it back together. (Correctors are sorted then oriented to,(as the name says) correct the primary.2. Remove the corrector plate. Mark any shim locations with a marker on the outside of the corrector plate (remove after re-installation)3. Make a solution of 50% distilled water and 50% isopropyl alcohol. (97% pure or better- I use 99% pure alcohol) 1 drop of dish detergent may need to be added,depends on the stain.4. Rinse the secondary until grease is gone. Do not rub mixture on mirror, just keep rinsing.5. Rinse with pure distilled water,gently stand corrector up to dry. 6. Assemble the scope. Use the same water/alcohol mixture to clean up the outside of the corrector. Dampen cotton balls and wipe with VERY light pressure.Wipe once, throw the cotton ball out and use a fresh one. Do not make the cotton balls too wet, you don't want moisture to get under the corrector.7. If the stain is really tough, acetone may be used without damage to the mirror surface.8. Use surgical gloves to avoid fingerprints.9. Lots of towels at work area in case the corrector slips out of your grip.10. If you put it together correctly, minimum collimation will be required. There have been a number of these problems cropping up lately, I think Synta is using inferior grease now.If you are really brave, clean the old grease off and add one drop of lithium grease. Run the primary through focus range a few times to distribute. If you do this, you can later flock the inside of your scope to increase contrast.
Read More At : CPC 1100 GPS (XLT) (70 x 280mm) Telescope...

Not getting power to the drive motors - Meade ETX-125EC (500 x 127mm) Telescope

I own an ETX90. Is the power light on the computer control panel ON?If yes then the board is probably OK. If NO- either the power cable is bad or the board is blown.Try a new power cable first, and or install batteries and see if that works. If the light is on you could have a loose wire inside. Re-seat the connections inside the base. Read these instructions: it still does not work you can send it back to Meade for repairs. Call them about that here:
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Focus. Knob is tight - Meade ETX-125EC (500 x 127mm) Telescope

Remove the OTA from the rear cell; unscrew the focuser shaft about half way (CCW) and remove the knob or electric focuser unit; there are three very small hex cap screws which hold the OTA into the rear cell; remove these and save in a tuna can or similar, because they WILL get lost if you place on the countertop. Once done, merely grasp the blue OTA in one hand with a rubber glove for grip and the rear cell/fork arms in the other hand and pull gently NOT twist while separating! You will see where the threaded focus rod inserts into the OTA....typically binding is causing the shifting, but most of this is due to poor milling by Meade on some 125 models. You can improve these imperfect models greatly, but do not expect to eliminate all focus shift. Run the focus rod gently all the way CCW until you feel NOT force or you will damage. Once there apply a thick grease, such as pure white Lithium (available in the tool dept. at Lowes) in a very thin layer, pushing hard into the NOT apply too much or you risk getting this stuff on the optics eventually. Once done, put the knob on the rod temporarily and run it in and out all the way slowly about 3-4 times. Once done, run it HALF-WAY between all the way and all the way out and stop. At that position, turn the OTA to about a 45-degree tilt, with corrector down and put 1-2 DROPS of 3-in-1 oil right where the threaded rod goes into the threaded rear cell of the scope and QUICKLY run the focuser CLOCKWISE to get that thin bit of oil into the rear cell threads. Once done, run the threaded rod slowly all the way CW and then CCW about 2 more times. This procedure will greatly improve the performance....NOTE: do NOT put more than 2 drops of oil on the rod!
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My Meade ETX-125EC Telescope has a broken horizontal lock lever where can I get a replacement? thanks

Meade can probably sell you one : might also find something that would work to tighten it at a well stocked hardware store.
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