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Thread: Disassembly of my OTA with pics(ETX125EC)

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    Default Disassembly of my OTA with pics(ETX125EC)



    Cleaning and inspecting my ETX I saw something in my mirror guide shaft that looked like rust so I decided to pull apart the OTA and clean,inspect and regrease if needed.

    My scope is from early 2004 so I figured it was about due.No particals were on the mirror,Optics were perfect but it bothered me thinking that rust was inside the scope killing all the metal.

    First off get a set of standard hex keys(allen wrenches) plus a .50 size for the focus knob set screw.
    Clean your hands good.
    Leave the lens cover on for saftey

    1.) removed the focus Knob,the screws on the side stay in

    2.)Remove the view finder and the only three screws holding the OTA tube assembly to the Plastic back.

    3.)Once the three screws are removed wiggle the OTA and pull gently,Dont worry theres nothing to break or get hung up.It just slides stright out.

    OTA seperated


    4.) Grip the blueish OTA tube and the Black back of the Tube,The Mirror assembly is threaded into the OTA,Unscrew it carefully and gently,Dont be rough and bump that Mirror in the inside.This should be fairly easy to unscrew.





    I found a piece of leaf and a buncha dust in the flip mirror section,no rust.What i saw was the factory grease for the mirror slide that had dust and a leaf stuck to it which I mistaken for a rust flake.

    So Inspect,dont touch the mirror
    If they are dirty clean as per meades instructions and dont use any Lens cleaner you have around.

    I removed my dust and leaf and fully worked the mirror slide,Meade provided enough grease to where I didnt need to reapply anything.

    I fully looked everything over and fuctioned tested the focus,It was smooth and greased well.

    5.) was to use an aresol duster to remove dust from the flip mirror area.Cleaned with the mirror in place.

    6.) reversed the dissassembly processed,triple checking the inside the OTA for dust.

    Dont be affraid to try this,have steady hands and take your time.I think the most importanat part is to not touch the mirrors or bump them.
    Notice the screws with the red paint on them in this pic..leave those alone they hold the mirror assembly onto the black back plate.
    notice the set screws with paint on them also,the look like the adjust the mirror angle,Im not sure but Dont touch those either

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    Thanks for a look inside the scope, it doesnt seem as intimidating looking at the pics..

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    I have posted up a Word document that shows the complete disassembly of an ETX125PE -- and describes the problems found inside the scope. The original is available on the ETX Yahoo Group in the "files" section.

    http://www.wingsoverusa.com/ETX125PE.doc

    Save this file to your machine if you own an ETX125-- however remember that the internals may be slightly different (slightly) depending on if you have a PE version or one of the original ETX125 scopes.

    The OP wanted the actual "picture" document located at Yahoo Group - ETX125. This is it and one of the most complete descriptions I have ever been able to find.

    Clear skies.
    ETX 125PE, Stellarvue 80mm BV & Televue TelePod tripod,
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    TelescopeMan Web Site

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    search for W1XWX to see my amateur radio web site

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    This was definitely a thorough breakdown. Thanks for taking the time and guts to do it. I almost did this to my ETX90 to go in and clean the mirror but decided against it. Are you gonna flock the inside of the tube now that its out?
    Cal
    ETX-125
    ES 11mm, 16mm, 20mm, 24mm


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    Quote Originally Posted by Pingu View Post
    This was definitely a thorough breakdown. Thanks for taking the time and guts to do it. I almost did this to my ETX90 to go in and clean the mirror but decided against it. Are you gonna flock the inside of the tube now that its out?
    havent even thought about it
    what do you recommend using to flock it?
    Flat black paint?

    its super easy to pull apart so I dont mind doing it agin for a flocking

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    I'm not sure what material to use or how to apply it. My refractor has what looks like felt material glued inside the tube and dew shield.
    Cal
    ETX-125
    ES 11mm, 16mm, 20mm, 24mm


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    Looks like this would work.

    ScopeStuff
    Cal
    ETX-125
    ES 11mm, 16mm, 20mm, 24mm


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    Quote Originally Posted by Pingu View Post
    Looks like this would work.

    ScopeStuff
    Thankxz I ordered a roll,I'll try it out and post the results and the install.

    Maybe I'll do the LX200 breakdown also

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    Sweet! I wish I still had my old ETX90!!!!! I would do this in a flash!
    Cal
    ETX-125
    ES 11mm, 16mm, 20mm, 24mm


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    That scopestuff site has really cool stuff and low prices.Most of all there shipping was extremely fast and cheap

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