Question about Celestron Celestar 8 Deluxe Telescope

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Celestar 8 dec knob assembly

I was using the telescope and the knob got twisted off then the whole inside assembly came out and i'm missing a piece anyone know the parts of the assembly and where I might get what I need

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Contact Celestron directly--
http://www.astronomics.com/main/Warranties.asp/catalog_name/Astronomics/category_name/AK9TFU21GCR78LKGXH66AS3XN7/Page/1

Posted on Jun 28, 2009

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Anyone know where to find a replacement VERTICAL LOCK KNOB for a Meade ETX-70? Or what fix might work instead?


Look at the link below for a FIX for a broken Dec knob. This is a common problem so once it is fixed do NOT overtighten.

See this:
http://www.schlatter.org/Dad/Astronomy/etx90decknb.htm

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I need to know how to assemble the eyepiece on a Bushnell 565 telescope?


The eyepiece DOES NOT assemble. It is all one piece. If you unscrew the bottom or the top-- never do this. You must reassemble the lenses exactly.

The eyepiece goes directly into the diagonal (an L shaped device with a mirror inside, and then the diagonal goes into the tube.. That's it. You can buy eyepieces from dozens of different suppliers. Here is one:
http://www.amazon.com/Televue-15mm-Plossl-1-25-Eyepiece/dp/B0001GO15S

Jul 08, 2015 | Bushnell Optics

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I have an older meade LX2000 EMC 10


The main problems encountered with the mechanics of the telescope centre around the mechanical swarf, grease compound, the liberal use of grease and the quality of machining of the main DEC and RA gears.
1. Remove the motors from the telescope. Be careful when removing either motor as there is a compression spring between the motor mounting frame and the worm shaft assembly.
The RA motor is located under the telescope body, removing the 4 screws and 2 Allen bolts will allow the bottom cover to be removed, thereby allowing access the the 2 Allen bolts holding the motor in place. Unplug the motor from the main PCB before removal.
The DEC motor is in the the fork arm containing the clutch and fine DEC adjustment control. (Never to be used with power applied to the scope). Remove the 3 small Allen screws holding the plastic cover plate in place and the DEC clutch knob to allow access to the motor. Remove the RJ45 connector located inside the telescope fork arm. Then remove the motor by unscrewing the 2 Allen bolts holding the motor in place.
2. Remove all grease from the motor worms, especially around the RA motor's magnetic pulse detector and the permanent magnet built into the worm shaft.
3. Remove all grease from the main DEC and RA gears, making sure to clean into the gear teeth.
4. Lightly re-grease with a Molybdenum Disulphide based grease (Castrol MS3 is great for this application if you can get it)
5. Assemble in reverse order. But before doing so, carry out the electrical adjustment above then, (a) relocate the the RA and DEC control PCB's in the vertical plane thereby gaining access to their respective backlash Allen screws. Adjust for 20thou max clearance when in final position. Note:- the DEC adjustment screw has to be replaced for a longer unit complete with a thin bolthead as this adjustment has to be carried out with a spanner....there is no room for an Allen key adjustment here.
6. A drop of Loctite must be applied after adjustment.
7. The final part of the process is to run in the gearing. Apply 12 volts to the motor wires, either at their respective plugs or to the motor direct. Allow to run for 2 to 3 hours in each direction by reversing the battery polarity to bed the teeth engagement. Remember to release the clutches.

Dec 28, 2011 | Optics

1 Answer

I have a Celestar 8 .I need a replacement circuit board mfg by Tangent technologies part #TM5-3 , Any ideas on where to find one since celestron has discontinued to service this model .


Two possibilities--

1. Place a want ad on www.astromart.com It will cost you $12 to join and put up the ad. There might be one in working order somewhere --- used.

2. Contact Ron Sampson on the Yahoo LX200 tech group-- join for free and post a message for him. Ron can repair any of the electronic boards from various telescope brands.

Good luck.

Jul 19, 2011 | Celestron Celestar 8 Telescope

1 Answer

Found old black tube telescope.Says GILBERT on white stripe in middle.Its on a tripod.Looks like a piece is missing that goes on top of tube.could i use something to make it work. how do i use it. Has lens...


That was probably a finder scope. If it is a real Gilbert the company went out of business about 40 years ago. Here read this:
http://uncle-rods.blogspot.com/2007_03_01_archive.html

They also made kid's chemistry sets:
http://uncle-rods.blogspot.com/2007_03_01_archive.html

Here are some finder scopes:
http://www.agenaastro.com/Straight-Finder-Telescope-s/74.htm

Jan 30, 2010 | Edu-Science (10166) Telescope

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Collimation screws on the Celestar C8


If you are going to replace them contact "Bob's Knobs" and order the replacement thumb screws. Makes collimation much easier, no Allen wrench needed.
http://www.bobsknobs.com/

Sep 29, 2009 | Celestron Celestar 8 Telescope

1 Answer

The dec, knob must have streped on my 2000 LX90.


Look at this for a possible fix--

http://www.scopestuff.com/ss_ezck.htm

Jun 23, 2009 | Meade LX90GPS: 8" LX90 GPS Telescope

1 Answer

Backlash on scope tube meade lx90


The washers are there for a reason-- there is an adjustment screw for the worm gear-- and the Dec axis works off a friction clutch when you tighten the knob on the fork arm.

Are you talking about the center bolt on the tripod that holds the telescope on the tripod-- ??? If you overtighten this it will interfere with the rotation of the telescope....and can break the motor.

Here is Jan's LX90 web site with disassembly instructions and pictures--

http://jan.eaglecreekobservatory.org/

Apr 02, 2009 | Meade 8 2000mm f/10 LX90 LNT Motorized...

1 Answer

Telescope knob


Still not enough information, but taking a stab at it, I'll assume you mean the pinion rod that goes between the focus knobs, and engages a gear rack on the focuser. There are locations where they can be purchased, and you would need to provide the OD and pitch (teeth per radian) to match.
Try: http://www.pinionrod.com/ as a source.

Jun 13, 2008 | Optics

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