Hi Luis, Some useful information for your drive & gear setups: LXD75/55 Native Gears The Drive motor gear: .8 Module 35 teeth 28.8 PD 29.6 OD 5mm Bore Worm...
Hi Mark, thank you for your reply, that's almost all I need, only a clarification, the drives that I purchased have the original 35 theet gears, so, the...
Luis, Looks like you have the correct answer for your equation, the + and the - will not change, you will still use the same one for the axis. I can't remember...
Hi all My DMD-2 controller has allmost died. It won't move when tracking but it will move when slewing at 16x. Both MT-1 motors share the same behavior. So i...
Yes, due to the nature of this group, buying and selling on this group is perfectly acceptable. The three requirements are that sellers must give their real...
I have an LX90 bought in 2002 with AutoStar 497. Is it possible to acquire a replacement board for motor control in RA/Azimuth. ? Thanks Jean-Paul Richard....
Ricardo, Good hunting! This is not surprising. I find about 90% of all "electronic" problems are really problems with the electrons getting across some...
Jean-Paul, During their recent financial meltdown Meade announced they would no longer service any product that was out of production. They backed away ...
George: Thanks for the note. It was easy to open up the LX90 and I will take a photo of the motor board today and post it. Then, I will post to this group ...
I have uploaded two pictures of the LX90 motor board. Using PhotoShop, I have tried to make the numbers of some components easier to read. The name of the...
Gday Jean Paul Those chips appear identical to what is used on the LX200GPS motor cards as well. Several people on the LX200 forum have successfully replaced...
Andrew and ccs_hello: Yes, my attempt to take out a very bright spot in the image of 4947 included a slip and I did not have the courage to start from scratch....
Hi, Jean-Paul, Hmmm, the 4947 chip looks decidedly scorched :-( Assuming that's a FET, I would simply replace it (hopefully you can source one or an ...
Peter: Amazing. I should have seen that !. Now, looking with a lens, I can see that there is probably something wrong there. Thanks for the insight. Following...
Better pictures have been taken of the LX90 RA motor board and of the specific area of the Q1 and Q2 FET's. The two pictures have been uploaded to the photo...
While you have it out, why not take a photo of the -back- of the board, too? Then we'll have a "reference set" and can partially trace the wiring (and look...
Gday Jean-Paul ... Yep , that's definitely a pimple now (or volcano). I'm amazed you didnt smell it. ... PhotoShop. ... Yep, the magic smoke left well before...
Hi I had a similar problem with a different brand of mount, one of the chips had a hole in but after spending the money for new chips from I found that it was...
I have uploaded two pictures of the back of the LX90 RA motor board. One is as obtained by rotating the board as in turning a page in a book. The other is...
I've haven't been roboscoping of late, my last project was a Vixen Polaris GEM which I sold and acquired on of Chris' LXD converted Vixen GPDXs and it has been...
Ok, Just wanted to confirm for my DS motor with a 96 tooth ring the ratio would be 2.19022 and I can select the ETX-125 mount since it uses the DS motor too. ...
... From the GearRatioGospel file (in the Files area), 2.190221 seems to be the correct ratio (or -2.190221) The consequence of using an ETX as your "model" is...
Thanks Dick for the quick and informative reply. I'm no electrical engineer so how does placing a tiny 1 ohm resistor in series protect the circuits. Is it ...
... Read it again... i said "1K", .... that's one kilo ohm, or 1000 ohms. Which will serve as a current limiter, hopefully not as a fuse. have fun --dick...
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