Last updated: 31 March 2007
This page is for user comments and information of a general nature or items applicable to all LXD55 and LXD75 models. If you have any comments, suggestions, questions or answers to questions posed here, e-mail them to me and I'll post them. Please use an appropriate Subject Line on your message. Thanks.
Subject: PEC training messing up tracking rate on LXD-75 Sent: Friday, March 30, 2007 02:44:35 From: Gernot Stenz (email@example.com) after posting a question about the Autostar's PEC function on the LXD yahoo group and not getting any positive answers I got curious again last night. I powered the LXD up and trained the PEC. The result: same as ever. Once you start the training, the Autostar messes up the tracking rate, which is indicated by the fact that already during training, the mount is by far more responsive to the left arrow key than to the right arrow key. Once PEC training is finished and PEC enabled you get a steady drift of the star westwards. Now this is not new. Quite a few people have found out about this, even if this problem has never been officially acknowledged. What I found out last night was that even using the custom tracking rate will not help you (+21 too slow, +22 too fast). Also it is unclear if the slow-down of the tracking rate would be reproducable (a fellow astronomer determined a value of +10 for his mount using MyScope). Does anyone know a fix for this problem or know whether Meade are intending to fix this at all? The way it is now the "Smart Drive" feature is completely useless. Clear Skies, Gernot -- __o Gernot Stenz e-mail:firstname.lastname@example.org /\ -\<, WWW: http://www4.in.tum.de/~stenzg /\/--\ _(_)/(_)_London - Paris: 3547 km__________________________________/ \
Subject: Are LXD75 parts available? Sent: Monday, March 26, 2007 09:17:41 From: Leigh (email@example.com) Thanks for a great site. I'll join the group shortly but could I trouble you with 1 question please?? I don't have an LXD setup but I'm in the process of buying a used LXD75 mount for my existing setup. I can't find any info on replacement parts. Do you know if motors/gears/boards etc are easily sourced or do I need to hoard whatever I can find in case disaster should strike?? Thanks for any advice u can offer Leigh Sherrett Cheshire EnglandMike here: What parts Meade makes available for their products are shown on their web site. Telescope Warehouse (link on the Astronomy Links page) may have some parts.
Subject: LXD55 Questions Sent: Sunday, March 25, 2007 06:04:56 From: djrLX90 (firstname.lastname@example.org) ETX-90 and LX90 owner here. I have a few LXD55 questions for you. First, what is your honest opinion of this mount for imaging with a DSLR and a WO ZS66SD APO @ about 300mm fl? Secondly, I have a chance to pick up a barely used LXD55 with everything that came with it + 2 extra 10lb weights for $300.00. Do you think this is a good price? Do you think this mount will be good for imaging with the above mentioned equipment? Thanks for your time, DavidMike here: Yes, the mount will work for that. You will just need a way to mount the OTA. Could be a good price DEPENDING on the condition on the mount.
Thanks for the reply on a Sunday. Normally I wouldn't ask, but I need to make the decision soon. The mounting I can deal with at the machine shop at the office. The seller it is barely used and had been in the box for the last 1.5 years. It did have a DEC motor failure, but Meade replaced it David
Subject: The new LXD75 Sent: Saturday, March 24, 2007 17:58:39 From: Steve (email@example.com) I don't know if it makes a difference or not, but I purchased the mount with out an OTA, because I wanted to upgrade from the LXD55.. I discovered that the worm and gears were completely un-lubricated. I took the motors and worms off and applied lithium grease. No more funny noises on slewing, just I nice smooth little hum at all but the highest speed where it does get a little noisy. No audible noise at all on tracking. This is intended as a word of caution for any who might be considering upgrading. Everything else is fine.
Subject: LXD75 Tripod Sent: Saturday, March 24, 2007 11:05:34 From: Thomas Allen (ThomasGLAllen@comcast.net) I don't know if you remember me or not. I was the one you helped with the defected ETX125. You were very helpful in calling Meade and talking to some higher ups involved, and eventually I got a brand new one. The ETX works fine. No problem. But just about three days ago, I ordered an LXD75 from OptCorp (from Chris Hendren). When I first got it, I noticed that the batteries for the illuminated reticle were dead, and no plastic was between the batteries, as it stated in the manual. First thing that came to my head was "has this been used before, and hopefully it's not a lemon". When I first turned it on after puting it together, the R.A. drive sometimes responded to the handheld box (left and right arrows) and sometimes it doesn't, it's intermittend, and it's not the backlash. When I tried to use the up and down arrows, the declination drive did not respond at all to the handbox. I heard the bottom motor running, but do not hear to top motor running. I called Chris Hendren who I bought it from, and he suggested to try my ETX handbox (already though of it) to see if it's the handbox. I tried my ETX handbox, and I noticed the left-right arrows responded better (this one had the newest update), but the up and down arrows still did not move the top of the mount, so there is definitely something wrong with this mount, and possible the handbox as well. This seems hard for me to believe that if this is a brand new mount, it's defective. In some sense, it's not fair to buy a new mount that is defective, and to return it to Meade to be repaired. I can understand having it for a few years and then sending it in for repairs, but not three days. Anyway I think (and hopefully) OptCorp has much better service I would imagine than the last group I dealt with (telescopes.com), so I plan for now to work with them to get it replaced with a new one. But I wanted to look at it one last time and ask you if you had any ideas that might be wrong, whether you've seen this before, and if I'm missing a setup step somewhere that's causing the tripod to not function correctly before I send it back. I'm not looking forward to going through this again. It looks like desavue over again. Can't believe this. Anyway, thanks for any insight or help you can give. Tom Allen Albuquerque, NM P. S. : Also, I cheerish your ETX book. It's been immensely helpful, and when I have time, I'll send you some pictures and research items I've conducted with the ETX - your book gavie me a lot of good ideas. Also, I'm putting together an article on De-rotators for the LX200 Meade that I got working real well that you might be interested in (plan to get it published in Sky and Telescopes later this year). It appears to work just as good, if not better, than a wedge. We need one for the ETX. Thanks again.Mike here: Have you done a CALIBRATE MOTORS and TRAIN DRIVES? You need to do that the first time and if you swap out the AutoStar.
I tried the calibrate motors and train drives. For calibrate motors, the only thing that turns is the RA axis, not the DEC. When I tried using the train drives, the RA axis continues to move without stopping (with both handboxes), but the DEC does not respond or move during the training session. I'm a little lost. I think it can only be a defective mount. I also suspect that there is no quality control on these types of mounts (they must ship directly from China or Japan) as opposed to their ETX and LX line which are essentially made here. Any other thoughts? TomMike here: Hum. Could be a defective DEC cable or connector. Look at the pins in the connector and jack; they should not be too depressed otherwise they won't make good contact. But could be lots of other culprits too. If the connector/jack seem fine probably best to work through OPT. The LXD75 mount I got from them last May has been fine.
Thanks Mike. I'll look at the cable. Chris Hendren did mention that, unfortunately the other side of the cable attached to the motor is probably soldered in, so I can't test it with another cable. Anyway, I'll work with OPT and mention you ordered one without any problems from them. Thanks for your help. Tom
Subject: NEW LXD75 Sent: Thursday, March 22, 2007 19:12:36 From: Steve (firstname.lastname@example.org) Well Mike I am sorry to have to say that I gave up on the LXD55 and bought a LXD75, and while this might be like going from the fire into the frying pan, I have to say that I am somewhat impressed with the improvements. The 55 sounded like a ticking time bomb when it was tracking. The 75, while still amusingly noisy when slewing, emits a nice pleasant little hum when tracking. The 55 would never coast when trying to balance it. The 75 counter weight actually swings back and forth when I put it to the end of the counter weight shaft. The Chinese must make some pretty darn good ball bearings! Anyway, Saturday night, I am going to take it out to our local darker sky site, stick in the 6mm eyepiece, and see how much it dances around. P. S. The site we go to is Del Valle park. You can find it in clear sky clocks.Mike here: Yep, the LXD75 is a better mount than the LXD55 was.
Subject: Slight problem with lxd75 Sent: Tuesday, March 20, 2007 11:39:48 From: Stephen Olson (email@example.com) Sorry to bother you again with a problem, but you seem to be the GURU of the LXD world. I dont knwo if this is a problem or not. I took a look at the gears for the right and left movement. There is a "bit" of metal shavings. I tried to readjust the gears a few minutes ago. Everything seems ok, but when I move the scope with the left button the gears move back about 5-8 positions on the gear. It does not move when I do it to the right or up and down. I am not too sure if this really is a problem and needs attention or just leave it alone. The teeth are pretty close together. I can get a pic if you need it. thanks again, SteveMike here: It sounds like the gear might be slipping on the shaft. Check out the article "Fixing a Slipped RA Gear" in the LXD55 / LXD75 Information section on my LXD Site.
Subject: lxd motor failure Sent: Tuesday, March 13, 2007 16:12:37 From: skyho (firstname.lastname@example.org) hi, i from france, i email you for ask to help me , i have an lxd75 mount, when i start autostar, i have message " motor failure", i dont' can move the motor, do you know what this the problem? have you a solution, thank you for you helpMike here: Lots of possibilities but lets start with the simple ones first. Have you done a CALIBRATE MOTOR? Could you be overtightening the axis locks? Have you checked the cable connections (AutoStar and DEC drive)? Which axis doesn't slew when you power on?
thank you for your response, the cable conections is find, when i want done calibrate motor, i have message true "motor failure", when i power on, let's 2 axis not work, i have just led power, i can entry to autostar menu but imposible to move the motorsMike here: Has the mount ever worked? Have you tried inserting fresh batteries (don't forget to CALIBRATE MOTOR when swapping batteries or changing the power source)? As to checking the cables, be certain to check the conditions of the pins on the connectors and inside the jacks; they should be clean and not overly depressed (so that they don't make contact).
Subject: lxd75 weight limit? Sent: Wednesday, March 7, 2007 11:30:55 From: Stephen Olson (email@example.com) I was interested in buying the Astro tech 80AT. Before I order it will I have any weight issues with this scope? I am using the LXD75 sn8. DO you knoe what the limits are? I took off the finderscope for the telrad. Other than that I have nothing else on it. BTW. I got the balance set up very well. Thanks for your help as always. SteveMike here: Glad you got the balance working. As to a weight limit, I don't recall seeing any published figures. I have piggybacked an ETX-90 OTA on my LXD75-8"SC with a Nikon D70 DSLR attached at prime focus and haven't experience any problems.
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