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jpmills
journeyman
Reged: 03/03/09
Loc: Redford, MI
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CGE misbehaving
#5714256 - 03/05/13 11:35 AM
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I was just wondering if anyone who has (or had) a CGE mount has had the problem of the mount suddenly acting weird. Alignment would go just fine, including 2-3 calibration stars. Go-to would function correctly for a while then all of a sudden it couldn't find anything, take the wrong direction around the tripod, etc... The mount is currently carrying a C14, which when it works, works really well. This is used primarily as a traveling scope for a University. Clearing the settings back to factory defaults seem to cure it but it doesn't last.
Any thoughts?
Thanks, Jon
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corpusse
sage
Reged: 04/11/10
Loc: Mississauga, Ontario, Canada
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Re: CGE misbehaving
[Re: jpmills]
#5714274 - 03/05/13 11:44 AM
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Mine is like this now. Does it sound different too? I will eventually get the Bennett cable upgrade which should solve the problem. I actually can do 2 star align but if I try for any calibration stars it will start to go crazy.
I'm currently only using the mount for planetary and the planets are some of the few objects I can find even if the go to is messed so I'm just dealing with it.
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mclewis1
Thread Killer
   
Reged: 02/25/06
Loc: New Brunswick, Canada
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Re: CGE misbehaving
[Re: corpusse]
#5715228 - 03/05/13 07:49 PM
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1) Power problems - try a different power source. Low power can show up as a whole variety of strange problems before you get the more common HC resets and NR errors. Power supplies and batteries can sometimes start to fail without showing obvious problems. 2) RA/DEC cabling issues - try different cables but also plan to do the Gary Bennett upgrade. 3) Limit switches need adjustment - these will cause all sorts of strange issues. They are quite easy to adjust, the best guidance for this is on the Yahoo CGE_uncensored group. 4) Internal connector issues - It can be useful to just carefully go over all the internal connectors. Remove and replace each one in turn, and check for poor connections with each wire.
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jbalsam
member
   
Reged: 07/06/12
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Re: CGE misbehaving
[Re: mclewis1]
#5732165 - 03/14/13 12:26 PM
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+1 to what mclewis1 said. Check your power situation first. I have a CGE, and when I first got it I wasted several nights trying to do alignments that continually failed at different points. I was using a 12V power supply, but it was only rated to about 0.75A. I switched to a 12V/3A supply and it's been fine ever since.
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herrindude
super member
Reged: 07/25/10
Loc: Fairhope Alabama
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Re: CGE misbehaving
[Re: jbalsam]
#5733006 - 03/14/13 09:10 PM
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DO the Gary Bennett mod and loose the problems, sure its expensive, but you will never have problems again. I did it an have never regretted it.
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EFT
Vendor - Deep Space Products
   
Reged: 05/07/07
Loc: Phoenix, AZ
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Re: CGE misbehaving
[Re: jpmills]
#5733921 - 03/15/13 11:19 AM
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I agree that the number 1 likely problem is the power supply. A 3A minimum power supply is the best and if you are using a battery, then you need to have it checked out to see if it is still good. The other possibilities usually exhibit much more significant problems like "No Responce 16/17" or simply not working from the start. From there is is going to be connector issues with the RA and/or DEC cables.
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Eddgie
Postmaster
   
Reged: 02/01/06
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Re: CGE misbehaving
[Re: jpmills]
#5734468 - 03/15/13 04:43 PM
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I have been running a CGE for many year now.
Replacing the cables is not really cost effective and usually not necessary.
This is my opinion and my opinion only.
All of the Celstron mounts and the Meade LXD mounts I have owned have all mis-behaved over the years.
I replaced the cables on the CGE, and it did not really truly "Fix" the problem.
You can spend a lot of time and money on an upgraded cable system, but there is no need two.
The first thing that I have found will resolve the problem is to clean the sockets that the cables plug in to.
I believe that these contacts get either oxidation (they are supposed to be gold plated, to prevent this, but I doubt that anyone does this anymore, or loose tension.
Use DeoxIT and spray the contacts liberally.
These plugs are "Self Wiping" which means that as you plug and unplug them, the friction of one against the other is supposed to clean them, but if you don't remove and replace them regularly, I think the simply oxidize out.
About once every year, my mount will start over-driving in Dec. This is the main symptom I get that the software has corrupted. I have to do a hard reset to fix it, but if I don't clean the contacts, it will just come back.
Cleaning the contacts and in runs fine for another year (I never remove the cables when I take the head in or out, so no wiping takes place).
Once (after many years of ownership) cleaing the cables did not work. I removed the plate in top of the semi Pier and reseated every cable multiple times to wipe them. I put a new battery in at the same time. Mount worked fine after that but it has been about a year ago, so contact cleaning is almost due.
My mount will sit outdoors under a plastic cover for weeks at a time, so I am sure the exposure quickens the oxidation.
Replacing the cables can be a "Temporary" fix, because just replacing the cable will give the contact one "Wipe" and this may clean it well enough to buy you some time.
Someone said that the problem was grounding. I bonded the shells of the cables to the plugs and this did noting to resolve the problem, so I don't think that it is at all related to the failures people experience.
So, swapping the cables may "appear" to fix the problem, but it kept coming back for me.
But now, when it happens, I shoot some DeoxIT into the sockets and on to the ends of the cables and plug-unplug a half dozen times to wipe them, and away I go.
For about another year anyway.
So for me, the cables were not really a fix at all. Cleaning the cable sockets on the mount always gets me back into operation.
I had an LXD thought that kept failing. No amount of cleaing would fix it.
For this mount, I had to use a tiny spring hook and dig under the contacts on the plug on the mount that the HC plugged in to. I used this tiny spring hook (actually a tiny little crochet hook I believe) to re-arch the contacts in the plug. Fixed it.
Good luck with whatever path you take but if you clean the contacts and re-set the HC, my bet is that it will hum along fine for another year or two.
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Alph
Pooh-Bah
Reged: 11/23/06
Loc: Melmac
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Re: CGE misbehaving
[Re: Eddgie]
#5734636 - 03/15/13 06:24 PM
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Quote:
Replacing the cables is not really cost effective and usually not necessary.
That's right! It makes no sense. There is a very simple and very effective method to fix CGE cable problems. I am just amazed to see so many CGE owners who bought those super expensive replacement cables. It is just mind boggling to spend 25% to 30% of the mount value on cables!
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RStar
scholastic sledgehammer
Reged: 03/04/06
Loc: New Jersey
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Re: CGE misbehaving
[Re: Alph]
#5734848 - 03/15/13 08:12 PM
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If you're reasonably handy you can do the Bennett mod yourself at a fraction of the cost. Best thing I ever did for my CGE. Two and a half years of dead on goto's and flawless guiding, 40 to 50 imaging nights per year.
http://www.pbase.com/bobstarzynski/cge_upgrade_project
Bob
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