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Starpoke
super member
Reged: 11/14/07
Posts: 146
Loc: Western Montana
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I posted this in the NexStar thread but it seems that that thread is for folks with the single arm fork so I am posting it here too where the GEM folks hang out.--
My recently purchased CG-5, which I got used but was nearly new, has developed the mindless dec slew whether I attempt to go-to or even push the dec button. The RA motor responds correctly to the hand control commands but either of the dec. buttons initiates a full speed slew which only stops when power is turned on. It understands the "Up" or "Down" command but nothing else. I have opened the dec housing several times checking for tight connections but no amount of poking or fiddling does any good. So does this mean that my basket case needs to go back to Celestron? Do they charge a lot for the repairs? Are there better alternatives? What do I have to do to get service? I hope someone can give me some solid advice. Thanks
Glenn
Edited by Starpoke (08/07/08 11:31 PM)
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Jeff in Austin
professor emeritus
Reged: 02/26/07
Posts: 587
Loc: Austin, TX
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Glenn, I have that mount. Sometimes the Factory Reset command fixes the weirdness. It's worth a shot!
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Stellarvue SV102ED
Celestron C8-SGT XLT GoTo
Astro-Tech AT66ED
Canon 50D unmodded, TC80N3 timer, Stiletto Focuser.
DMK21AU04.AS
Coronado PST (Lunt LS60THa on order)
Supportive family, including First Grader w/ scope, curious toddler, and lovely wife.
Sponsor of Austin CSC, Austin CalSky.
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garyc11
Carpal Tunnel
Reged: 11/20/04
Posts: 2779
Loc: Niagara Falls,NY
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try the NexStar Resource Site you may find help there.
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CGE 1400
CPC 1100
MallinCam Hyper Plus Color
Celestron 100 ED
CG5-GT
Celestron C-8 Newtonion
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Patrick
Postmaster
Reged: 05/16/03
Posts: 6788
Loc: Franklin, Ohio
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What vintage CG5 do you have? Some of the older ones had this wild slew problem. The best fix might be to upgrade to the latest hand controller and firmware. If you have the latest hand controller (the one that has upgradeable firmware capability) you can try upgrading the firmware from the NexStar Resource page. They can also tell you how to check to see which hand controller you have.
Patrick
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Discovery 10" f/6 Split Tube Dob
Celestron C6 SCT
Denk Binoviewers
AT66ED Refractor
Oberwerk Ultra 15x70 Binocular
475B Geared Tripod & 501HDV Head
Oberwerk 9x60 Binocular
Celestron Regal 8x42 Binocular
Canon 30D DSLR
Mini EQ1
My Astronomy Pages
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Starpoke
super member
Reged: 11/14/07
Posts: 146
Loc: Western Montana
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Thanks for the advice. The guy I bought it from showed me his invoice from OPT dated August '07 so I know it is recent production. I have been to the NexStar Resource site and followed the instructions for updating the hand control and motor firmware. I also took the puppy apart, regreased with super lube and put it back together loosing only one of the two screws that hold the dec. housing together. It worked beautifully for me the week prior to going bonkers. Got polaris in the RA axis, did two star auto align followed by 3 calibration stars and the Goto's were dead on. The next week, after I set it up it went nuts. I can fiddle some more and I think I will try the factory reset to see it that restores some sanity to it. I will post how that works for me. In the meantime I will continue to use my Brandon on the Polaris mount. Cheers.
Brandon on Polaris, hopibng the clouds go away!
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152nn f9 Starfire Apo on Schaefer AT-4 Mount
94mm f7 Bandon Apo on ASGT (or Polaris when AGST is on the fritz.)
eyepieces, books, some old scopes and mounts - ect.
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Starpoke
super member
Reged: 11/14/07
Posts: 146
Loc: Western Montana
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Trying again on picture
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152nn f9 Starfire Apo on Schaefer AT-4 Mount
94mm f7 Bandon Apo on ASGT (or Polaris when AGST is on the fritz.)
eyepieces, books, some old scopes and mounts - ect.
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Fred1
scholastic sledgehammer
Reged: 09/19/07
Posts: 767
Loc: Garnet Valley, Pennsylvania
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Aren't wild slews usually an indication of power supply issues? Is that a D cell battery pack dangling from the tray? If so, you might need a longer lasting power supply.
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Fred
Celestron 8" SCT w/Starizona Feathertouch Microfocuser and Orion 9x50 RACI FinderScope;
Stellarvue Nighthawk Aplanat w/Orion 6x30 RACI Finderscope
Vixen Sphinx SXD/Hal 130
Celestron CG5-ASGT
Stellarvue M1/Surveyor Tripod
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seeker372011
scholastic sledgehammer
Reged: 03/05/04
Posts: 783
Loc: Sydney , Australia
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yes you need a power supply capable of putting out at least 2 amps I think. A jump starter will do the trick and keep you going all night..or a reasonable size gel battery (say 17 AH)
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ETX 70,ED 80 on a CG5 Mount;Orion Star Shoot Deep Sky Imager,Canon 300D modded;20 x 80 LW Obies;PST;10 inch GSO dob
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Starpoke
super member
Reged: 11/14/07
Posts: 146
Loc: Western Montana
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Sorry for the confusion. That is my back-up mount, a vixen Polaris mount and yes, the orion eq3 drive uses 4 D cells. For the CG-5 I have a celestron power tank, an 18 amp/hr jump starters and a 6 amp 12v. power supply so I have eliminated low voltage in this situation. I am getting pretty good results with the Polaris mount but I miss the GoTo feature as well as the $500+ I spent for the insane mount.
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152nn f9 Starfire Apo on Schaefer AT-4 Mount
94mm f7 Bandon Apo on ASGT (or Polaris when AGST is on the fritz.)
eyepieces, books, some old scopes and mounts - ect.
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