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Celestron CG5-ASGT Problem

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#1 JIM262

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Posted 11 September 2012 - 09:35 AM

I have this mount about three years with no problems. Now I have one. While performing a 2 star align, my mount will not completely stop slewing and does not ask to use the arrow buttons to align the selected star. I checked the power supply and used three different sources - same problem each time. I checked the DEC cable with OHM meter and all six connections ok. I took the mount covers off and all cables look good. Could one of the boards be a problem?

Of course the mount has to act up during the best weather conditions in my area.

#2 austin.grant

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Posted 11 September 2012 - 10:03 AM

Mine's done that before, and I seem to remember just hitting UNDO and selecting the same star again. The second slew has always worked fine, although it is a weird problem.

#3 mclewis1

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Posted 11 September 2012 - 10:32 AM

Jim,

Make sure the power connector is tight (carefully split the center pin a bit often helps). Check the power switch isn't starting to fail (getting warm), try slowly exercising the switch a bit (bunch of on/off movements with the power off).

Reset the HC to factory settings - but make sure you save any of your backlash settings first.

Clean the HC and DEC cable connectors and sockets with some contact cleaner.

Update the firmware in the HC.

#4 JIM262

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Posted 11 September 2012 - 10:36 AM

Mark,
I did all your recommendations last night and to no avail.

Thanks though for your response.

Jim

#5 mclewis1

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Posted 11 September 2012 - 11:35 AM

Well then I guess we're looking at ...

- internal cabling
- MC board
- Encoder (if it's moved you may need to have a look at it's spacing - you'll need a very small allen wrench to adjust it. It's a very subtle adjustment (very small spacing). There have been some discussions about adjusting the encoder spacing here and on the ASGT Yahoo Group. Try searching on "encoder runaway slew").






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