Need help!

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  • Member since
    December, 2013
Need help!
Posted by BearTracks on Sunday, December 15, 2013 4:50 PM
Hello! I am new to telescopes, so please bear with me as I do not know the proper terms. I need help with a Meade DS motor. From what Ive read the telescope is a DS 2000 Newtonian reflector. I got the 494 AS handbox last night & plugged it in, the led screen read "Intializing" then "CTR Vega". I could hear the motor running, but the scope wasnt moving. The led then read "Motor Fault" then a long list off possibilities. I had fresh batt. & the scope was level. So I took the mount apart & all of the gears except one looked good. The one had some worn teeth (they are plastic) but when I used the directional buttons on the box, the gears moved. There is a tube thing that looks like a screw. I think its supposed to move back & forth on the metal rod inside of it, but it doesnt. Thats the only thing that wasnt moving. Also there was a metal arm that lookdls like a clutch that was very loose and had worn a groove on the cover of the motor. I think thats what caused the gear teeth to wear down. I hope that made sense. I got this as a starter scope for my son for Xmas, so I need to fix it asap! If anyone needs pics Ill be glad to email them. Thanks in advance for any advice
  • Member since
    November, 2009
Posted by Poppa Chris on Monday, December 16, 2013 8:17 PM

From your post I assume this is a used scope.  If it was purchased as "new" and had worn gears i would send it back to the vendor immediately for replacement or refund.  The worn or damaged gears could have come from using a badly unbalanced scope with the clutches set too loosely, which corresponds a bit with your description.  The other possibility is forcing movement by hand with the clutches engaged thereby "stripping" the plastic gears which can easily damage them; a sure sign of mistreating the instrument.  To properly fix the issue the gears should be replaced, preferably with brass gears.  Since this will be next to impossible by Christmas, the best you will be able to do is to clean up the gears as best you can with something like a fingernail file or emory board, thoroughly clean up everything and relubricate with a small amount of lithium grease.  Do not get grease on the clutches!  When using the scope make sure the clutches are tight so there is no slippage when the motors are running.  also, make sure the scope is properly balanced so there is minimal strain on the gears.  Good luck...

---Poppa Chris---

Denham Springs, Louisiana USA

"Second star to the right - Then straight on until morning!" - Peter Pan

Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars

 

  • Member since
    December, 2013
Posted by BearTracks on Wednesday, December 18, 2013 1:44 AM
Thanks Chris! I got the worm working & its slewing up and down now. It will slew to the right but if I slew it to the left, it stops slewing all together. The teeth on what I think is called the flywheel are worn. And when it moves to the left I dont think it is engaging the bullgear so the fly just slips above it & goes off track. Im going to clean it tomarrow & put some gear grease on it and see it that does help. Eventually I am going to brass gears because the plastic ones are crap. As soon as I figure out where to get them. I was thinking about trying to make the spaces between the teeth a little deeper But Im afraid of makingthe gear too short
  • Member since
    November, 2009
Posted by Poppa Chris on Wednesday, December 18, 2013 6:11 AM

Make sure you use a low temperature white lithium grease.  It gets cold using the scope in the winter and some greases will bind things up at low temps.

---Poppa Chris---

Denham Springs, Louisiana USA

"Second star to the right - Then straight on until morning!" - Peter Pan

Celestron CPC1100GPS (XLT) - 279mm aperature, 2800mm Focal length. (f10) Celestron Ultima LX (70deg AFOV) Eyepieces 32mm thru 5mm, Canon EOS Rebel T2i DSLR, Backyard EOS imaging software, Orion Star Shoot Planetary Imager IV, Celestron Skymaster 15x70 binoculars

 

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