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Equipment Discussions >> Mounts

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Eddgie
Postmaster
*****

Reged: 02/01/06

Re: CG-5 Goto mount problem... new [Re: dwitek]
      #3745569 - 04/14/10 09:14 PM

I don't think these cables should be flat. They should be twisted pair. The twist in a data cable greatly reduces interference from outside sources.

And again, any intermittent connection I think will cause most of the symptoms mentioned in the OPs post and your own.
You may want to check the contacts in the RJ jacks. De-ox maybe.. I don't know. I fixed mine by gently forming up the spring contacts inside the RJ plugs on the mount.

Of course you problem cold be totally different than the problem I had, but I had it with 3 different mounts and was able to improve operation just by doing the above.

I have to confess though that it doesn't even make sense to me. The RJ Jack was invented by the phone company to be hyper-reliable and it is a brilliant design.

And yet I have had LXD and CG5s and my CGE all experience run-aways, and cleaning the contacts and reforming the spring contacts seems to have elminated the problem ever time.

Anyway, could be someting else entirely.

Regards.


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dwitek
sage
*****

Reged: 07/03/08

Loc: White Lake, Michigan
Re: CG-5 Goto mount problem... new [Re: Eddgie]
      #3745600 - 04/14/10 09:53 PM

Update on mine:

I swapped the motors from RA and Dec and the problem moved with the motor. Now the RA does the exact same thing and the Dec motor stops where it should. It looks like, at this point, that a new motor is in order. I've not looked into this particualr motor before but I'm going to check to see if there is an issue I can spot inside the cover on the back. Maybe the encoder is covered or loose. On my LX200 you can see the encoder but this is more sealed.

Will update in a little while.


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jrcrillyAdministrator
Refractor wienie no more
*****

Reged: 04/30/03

Loc: NE Ohio
Re: CG-5 Goto mount problem... new [Re: dwitek]
      #3745609 - 04/14/10 10:00 PM

Quote:

On my LX200 you can see the encoder but this is more sealed.

Will update in a little while.




The back cover snaps off and reveals the encoder wheel.


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dwitek
sage
*****

Reged: 07/03/08

Loc: White Lake, Michigan
Re: CG-5 Goto mount problem... new [Re: jrcrilly]
      #3745635 - 04/14/10 10:18 PM

There is nothing obviously bad about the encoder. It had some grease on it so I cleaned it off but it acts the same. I adjusted it very close then far away from the LEDs and that didn't change anything.

I mentioned that changing the slew rate only effected the RA. Since the motor swap that problem has also moved so it HAS to be an internal motor issue. I will order one from Celestron unless someone has a better, and/or quicker, source for it.

Agnosticus, you may want to try the motor swap and see if the problem moves with it.


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rmollise
Postmaster
*****

Reged: 07/06/07

Re: CG-5 Goto mount problem... new [Re: dwitek]
      #3746099 - 04/15/10 07:39 AM

Quote:

Just yesterday I received a used CG-5 and mine does the EXACT same thing. It slews close to where the first alignment star should be (it's still daylight), stops for about 10 seconds but the "working" Icon keeps spinning. Then, the scope starts slewing, in dec only, for about half a revolution. Then, it pulses in the same direction until the dec cord wraps itself around the housing and I have to stop it or else it will rip the cord apart.






Well, your problem is in declination, and you replaced the declination cable, so _I'M_ thinkin' that might just be a suspect.


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Agnosticus
Pooh-Bah


Reged: 09/12/04

Loc: 43N, 89W, Earth
Re: CG-5 Goto mount problem... new [Re: rmollise]
      #3746117 - 04/15/10 08:02 AM

Hi Dave,

Thanks for your report! I will swap out the motors and see if that's it for me too. Obviously if the DEC problem switches to your RA when you switch the motors, your homemade cable is not the cause. Neither must it be in the electronic boards. It simply must be somewhere in the motor/encoder. I'm wondering if I should hang on to mine (the seller and I are talking about refund) until you get your motor and install it to see if that's the fix you need.

Thanks again... and your description of the slewing problem (much better than mine) is absolutely exactly what mine does, so it must be some kind of problem that fairly common.

PS -- to answer Rod, I used the car DC adapter (and started my car) to ensure enough power was getting to the 'scope. It was running at least 13v and plenty of amperage. Because of the consistent behavior of this problem, it just doesn't seem like a power issue anyway.

Edited by Agnosticus (04/15/10 08:03 AM)


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dwitek
sage
*****

Reged: 07/03/08

Loc: White Lake, Michigan
Re: CG-5 Goto mount problem... new [Re: Agnosticus]
      #3746403 - 04/15/10 10:43 AM

I have an email into Celestron to get a price for the motor. I will post their response when I get one. If I don't hear from them by mid-afternoon I will call them later today. They responded the next day when I asked about the cost for a new cable Wednesday night.

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dwitek
sage
*****

Reged: 07/03/08

Loc: White Lake, Michigan
Re: CG-5 Goto mount problem... new [Re: dwitek]
      #3746544 - 04/15/10 11:45 AM

Here is Celestron's response for the new drive motor. I will write them a check tonight and mail it tommorrow.

The part number is #CG5-F00-1 and is available for $28 plus $5 for shipping and handling.
To order, please send a check or money order, along with your part request to:
Celestron
P.O. Box 80770
San Marino, CA 91118
Attn: Parts Please make sure we have your correct mailing address and contat phone number. Please note this must be a U.S. or Canadian return ship to address and all parts requests are non-refundable.
**Note** California customers MUST add 9.75% sales tax to their order, exclusive of shipping costs.
Delivery time varies. On average parts orders can take 2-4 weeks, depending on availability. Please allow a minimum of 2 weeks prior to checking status of your part order.

Clear skies,

Celestron Technical Support


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Agnosticus
Pooh-Bah


Reged: 09/12/04

Loc: 43N, 89W, Earth
Re: CG-5 Goto mount problem... new [Re: dwitek]
      #3746861 - 04/15/10 01:49 PM

Hi Dave,

Yep, I called (and actually got through!) this morning and got the same info. Pretty cheap, really. Less than I expected. I think I'm going to go ahead and order one too. Thanks again for your investigations!

Kevin


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dwitek
sage
*****

Reged: 07/03/08

Loc: White Lake, Michigan
Re: CG-5 Goto mount problem... new [Re: Agnosticus]
      #3784154 - 05/03/10 05:18 PM

FOLLOWUP:

The new motors fixed both my and Agnosticus' issue with our mounts.


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