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Thread: Meade ETX 125 Observer. What’s new, disassembly and photos.

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    Default Meade ETX 125 Observer. What’s new, disassembly and photos.



    Hi all,

    I have posted this on another forum previously, and thought it may be of value to someone on an etx specific one. Before purchasing I looked everywhere for photos of the inner workings of the etx 125 observer and couldnt find any. I took the plunge anyway and bought one after only reading reviews of the older ones.

    I’ve had mine for over a year now and had cause to open it up recently. So I took some pictures along the way. ( Why? Well thats a another long story that I wont go into here other than to say the QC issues havent changed much ).

    So firstly whats the same.

    The tripod is basically the same set up, other than the attachment screws are now aligned across east west so to speak, so you dont have to tilt to tighten the screws.

    The ota is also much the same, the optics are still good with a dovetail to hold the red dot finder. It has a metal threaded rear port inserted into the plastic housing with a metal flange screwed onto it from inside the housing clamping it in place preventing it pulling out.

    The fork mount does look similar to the older ones except now it has the control panel on the fork arm and the battery access is now from the top, thats where the similarity ends.

    The inside is completly different, the main base, pan and fork arm assembly is made of aluminium castings with plastic coverings. All the important threads have brass inserts moulded into the plastic.

    In the dec drive fork arm the declination drive gear and worm are substantionally larger, the clutch also looks larger with a redesigned gearbox and circuit board in the arm. These are all easily accessed with anything swapped out in minutes if needed by removing 5 socket head screws holding the fork cover. (hopeflluy not needed in the future but easily done)

    The fork with the dec setting circle has the hard stop for over zenith and a
    tension spring which loads up as the ota approaches horizontal, reducing the weight on the worm gear.

    To get to the RA drive the base cover comes off with a screw under each of the six rubber pads, and I kid you not in saying that removing them was the hardest bit of the whole exercise and took the longest. I resorted to a razor sharp 1/4 wood chisel to carefully carve and scrape them off removing all glue. Bunnings have replacements.

    The metal base is sturdy with a central post, to this what I call the pan (looks like one) is attached by a bearing and the RA gear and clutch. The forks are attached to the pan with three socket head screws each side. The worm
    gearbox is accessed from underneath and easily removed. To access the RA worm gear and clutch, remove the forks, then the plastic top cover. The RA gear also appears larger. When the clutch is tightened the gear stays in place and the worm moves, hence no hard stops in the RA drive.

    In short it is sturdy, the parts are well cast and finished, with plug in electrical connectors and flat cables. Everything is easily accessed and removed (other than the rubber feet). A couple of modified allen keys and screw driver is all you need

    Now reassembled correctly it works great, aligns and tracks well in alt/az. Suits my needs fine for the moment. It’s about as big as I can go and still be easily transported when packed up into it’s case and doesnt take up all the car.

    Hope this is of interest to someone.
    Alan
    Pingu, E Sully, MCox and 3 others like this.

  2. The Following 4 Users Say Thank You to Alval For This Useful Post:

    burris (09-18-2018),Pingu (09-19-2018),smifx3 (07-29-2018),sxinias (07-29-2018)

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Enjoyed reading your report. Thanks a bunch for posting it as well as the photographs.
    SXINIAS

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Thanks Alval! This post is why I decided to take back the Nexstar 127SLT and swap it for The ETX 125 observer. BILL

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Glad it was of use to someone.
    Cheers Al

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    By the by, what do you mean by modified Allen keys? shortened?

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Yes just shorten the Allen (hex key) by grinding till it fits.
    burris likes this.

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Excelent reading, I have had my ETX in bit's but mines an older one, the forks are all plastic and its much weaker than the newer ones. It's good to see they have made improvements.

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Can't see any photos, where are they ?

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    This forum has issues with posting photos and stuff. I havent been here for a while. I received an email you replied to this post. Try this link. Meade ETX 125 Observer. What’s new, disassembly and photos. - IceInSpace
    I posted on another forum it has the photos. Or Try google the title of this Thread and add ice in space.
    Cheers Al

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    Default Re: Meade ETX 125 Observer. What’s new, disassembly and photos.

    Cheers mate, although this forum is not very active there is still tons of info on here. Happy new year to you mate, and many thanks for your reply. Colin..

 

 

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