Quote:I have a Celestron C8-CF XLT on a CG5 Advanced Series Go-To mount that I bought used last year. I am having a problem with the RA motor. At least once or twice during an observing session, I will punch in a new target. The mount will start slewing. About halfway to the target (or sometimes almost all the way), the RA motor will suddenly drop from its high-speed slew down to a very slow speed (equivalent to Rate 5 or 6 on the hand controller) and continue slewing at this slow rate right on past the target. It will not stop until I push one of the direction buttons on the HC. A few times I have let the RA axis keep going just to see what happens, if anything. It just keeps going and going. Once it came very close to knocking into the bottom of the mount.I've searched around on the 'net for this issue. I have found a lot of posts regarding runaway RA or DEC motors where the axis would suddenly start slewing at a high rate and not stop. My problem is exactly the opposite. It will slew to target at a high rate and then come to a crawl and just keep crawling without stopping.I was hoping that maybe a tuneup would solve my problem. I just finished performing a DIY Hypertune(TM) service on my mount last night. Got it all put back together and tested it out today. I just have it set up on the tripod without the OTA on it. Nope, still having that same intermittent problem. So, it obviously has nothing to do with with the OTA since it happens when the OTA isn't even on the mount.Anyone have any ideas or a similar experience? Thanks!
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
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Quote:3 days for a hypertune seems excessive though!
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