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David Pavlich
Transmographied
Reged: 05/18/05
Loc: Mandeville, LA USA
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LXD75 RA motor woes...
#4457382 - 03/18/11 08:43 AM
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The last time I used my LXD75 was at an outreach event...it was fine. Last night, I was at an outreach event and set everything up. RA wouldn't move, not slewing to do the star alignment nor when using the hand controller. So I did a Reset. When it came on, it went through the Test Motors run. The Dec axis moved, but the RA sat still. This is where the puzzle kicks in. There was no mention of a motor fault. The hand controller went on its merry way to have the information input as if everything was aces with the motors.
I haven't had a chance to open it up, but I thought I'd ask and get a jump start on some ideas. So...if it is the motor, I hope that Meade still sells them. Any ideas will be greatly appreciated.
David
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yock1960
Carpal Tunnel
Reged: 06/22/08
Loc: Ohio, USA
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Re: LXD75 RA motor woes...
[Re: David Pavlich]
#4457397 - 03/18/11 08:59 AM
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Maybe the motor is moving. Have you opened the access door to look at it? I have problems with the set screws on the spur gears backing off....if it backs of enough...the motor spindle would move but not the gear. If that were the case it might be pretty quiet too, with essentially no load.
Steve
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Pinbout
Post Laureate
Reged: 02/22/10
Loc: Montclair
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Re: LXD75 RA motor woes...
[Re: David Pavlich]
#4457428 - 03/18/11 09:20 AM
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yep, set screw. I took my gear off and drill and tapped it for a number 6-32, wait no a number 8-32 set screw. I wanted a 6-32 but grab the wrong tap and oops now it's a 8-32 hole. make a lot of difference from what a 4-40 set screw.
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SouthSee
journeyman
Reged: 10/25/09
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Re: LXD75 RA motor woes...
[Re: Pinbout]
#4457467 - 03/18/11 09:46 AM
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I used Loctite on my set screws.
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David Pavlich
Transmographied
Reged: 05/18/05
Loc: Mandeville, LA USA
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Re: LXD75 RA motor woes...
[Re: David Pavlich]
#4457573 - 03/18/11 10:45 AM
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Well, unfortunately, it was already dark when I found the hiccup. Reading your replies, I had one of those  moments. While I've not had that particular problem, I've read about it enough to have realized that could be it. It wouldn't have done any good since my tools were at home.  Thanks for the reminder! That's probably why the hand controller didn't give a fault message.
David
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VEEGER
journeyman
Reged: 03/11/11
Loc: Taylor Mill, KY USA
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Re: LXD75 RA motor woes...
[Re: David Pavlich]
#4458473 - 03/18/11 06:20 PM
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Depressing..... Got one sitting in the living room now... Original shipping boxes..... Just delivered today..
Edited by VEEGER (03/18/11 06:20 PM)
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Jeff Lee
professor emeritus
Reged: 09/17/06
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Re: LXD75 RA motor woes...
[Re: VEEGER]
#4458574 - 03/18/11 07:34 PM
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Veeger - the new ones don't seem to have this issue...I've got hundreds of hours on one I bought used and its working fine. Relax and enjoy your new mount.
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avarakin
Carpal Tunnel
Reged: 07/13/09
Loc: Parsippany NJ, USA
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Re: LXD75 RA motor woes...
[Re: Jeff Lee]
#4458744 - 03/18/11 09:17 PM
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Quote:
Veeger - the new ones don't seem to have this issue...I've got hundreds of hours on one I bought used and its working fine. Relax and enjoy your new mount.
Agreed, this problem is easy to fix
Alex
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David Pavlich
Transmographied
Reged: 05/18/05
Loc: Mandeville, LA USA
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Re: LXD75 RA motor woes...
[Re: David Pavlich]
#4463075 - 03/20/11 10:07 PM
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Update: Gears were tight. Bought the Loctite for nothing.  So while I had it apart, I hooked up the power to it and off it went. RA is fine.  Put it together, took it outside, trained the drives, did a mach 2 star align and all is well. Er, I'll see the next time I use it. I think I'll get some good electronic cleaner and go over all of the connections just for good measure. The internal wiring looked find. Everything was tight and the wiring didn't show any signs of being pinched. I probably should've left it assembled and tested it tomorrow. 
David
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