Question about Celestron Advanced C10-NGT (600 x 254mm) Telescope

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I can't find any documentation on how to remove the primary mirror for cleaning. I'm a newb and don't want to mess anything up. Thanks, Bob

Posted by blfiam on

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Joe Lalumia aka TelescopeMan

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First -- how do you know the mirror needs cleaning? Did you shine a flaslight down the tube and see some dust? Never use a flashlight to determine if a mirror is dirty-- they are ALL dirty when you use a flashlight to check them.

Only clean the mirror if it is interferring with the views through the scope.

There is a ring around the back-- remove those screws and the mirror should come out-- don't driop it! Then remove the mirror from the mirror cell.

Posted on Sep 17, 2011

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Yep, only when you use the document feeder? If so, lift the document feeder lid, get a clean lint-free cloth and some glass cleaner. Apply some of the cleaner to the cloth then, clean the small of the two glass areas. That is the only section that reads documents fed through the document feeder! Run a blank sheet of paper through the document feeder first before cleaning and make a copy. Take the copy and, if there is a line (or lines)on the copy, place it on the larger document glass face up.Follow the line to the smaller glass. The dot of debris will usually be there. If you don't see anything wrong, clean the glass anyway. Run another blank sheet through the document feeder. Check that copy. If the lines are gone...Viola! you have solved the problem. It it has not and you've cleaned it more than once, the debris is on the mirrors under the glass and a technician will need to come out, remove the glass and carefully clean the optics/mirrors.
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1 Answer

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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.

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1 Answer

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1 Answer

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1 Answer

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