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Thread: A question to anyone who knows the old LX200 classic well

  1. #11
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    Default Re: A question to anyone who knows the old LX200 classic well



    If you are still having shorts on the main board and checking it out of the scope then you are in a bad place. It is now a systematic exercise of elimination. And if it is one of the chips then you will need to source a replacement, and remember it is obsolete. By all means explore....you can't hurt a dead board. The usual point of failure like this is from "external" influence, such from the motor boards. You could have a shot Op Amp as that drives the motors, but I would be guessing.

    So your other options are to find a replacement board, ship the board to a repair agent, or upgrade. I found a replacement board of ebay. You will need to do some hunting around, but with patients you will find one.

    There are now 3rd part upgrades to the LX200. I think I saw something of youtube. Again you will need to do your homework. Here is the site: https://www.youtube.com/watch?v=Nv2tshAsO8k

    Good Luck

  2. #12
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    Default Re: A question to anyone who knows the old LX200 classic well

    Quote Originally Posted by fforoge View Post
    Hi Rescue25,
    By the way, the original caps are not under-rated contrary to popular opinion.
    The original 25v caps are definitely under-rated for 18v power supply. The rule is your caps should be double the input voltage. The classics were originally all 12volt sytems, so the caps were fine. The problem arose when they changed up to 18v power supplies, to speed up the slewing, without upgrading the internals. This is why I have always run my 18v classic on a 12v power supply and never had any problems.
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    Mark
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  3. #13
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    Well campers I figured it all out. Yes it was the cap at C8 it turns out that there is another issue with the factory power supply. as it is not sending out 18 volts it is sending out 22.5 volts. it is enough to keep blowing the fuses and caps. plus you need to be sure that they are polarized correctly. Also it turned out that the C1 cap in the declination motor was also roached as there was a nice puff of smoke coming out of the fork as well. I since replaced both of them and I am running the scope off my 12 supply from my etx. It is working well. but now I need to adjust the supply that came with the scope so the correct voltage is at the output. Thanks for all of your input and help. My friend who sold me the scope suspected the power supply but It was not until I tried to use the 12volt supply that I was able to confirm the problem with too high a voltage. This is the very first time I have run across a device that would not handle this much of an over voltage. As with many times when you test a supply with no load on it it will read higher than it would loaded. in this case apparently it maintained the over voltage and then the roached the caps.

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  4. #14
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    Quote Originally Posted by fforoge View Post
    If you are still having shorts on the main board and checking it out of the scope then you are in a bad place. It is now a systematic exercise of elimination. And if it is one of the chips then you will need to source a replacement, and remember it is obsolete. By all means explore....you can't hurt a dead board. The usual point of failure like this is from "external" influence, such from the motor boards. You could have a shot Op Amp as that drives the motors, but I would be guessing. So your other options are to find a replacement board, ship the board to a repair agent, or upgrade. I found a replacement board of ebay. You will need to do some hunting around, but with patients you will find one. There are now 3rd part upgrades to the LX200. I think I saw something of youtube. Again you will need to do your homework. Here is the site: https://www.youtube.com/watch?v=Nv2tshAsO8k Good Luck

    This is an exceptional upgrade for this scope and Mike would make a mint on making these available I have tried to contact him and ask if he is still making the upgrade. this is soooooooooooooo KEWL. I do so much like the autostar over the original handheld. But as it stands now I'm champing at the bit for clear skys to try out my scope once and for all. It is working and ready to go. With a lot of patients and percerverince I was able to get the old board up and running but when I get the money i'm making the upgrade to this system. Super cool and then I can tie it to my laptop to do more time laps Photography.

    I hope he is still selling these.

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  5. #15
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    Default Re: A question to anyone who knows the old LX200 classic well

    Quote Originally Posted by fforoge View Post
    Hi,
    The first mistake I discovered was the line of longitude I was supposed to enter. My GPS gave me my longitude EAST of GMT...and I learnt Meade elected to go WEST. The fix was to subtract my position EAST from 359o60'. Ok that one sorted (I hope).

    Ok. Setting the time. I used the website "Time.is" on the very likely assumption that that time is within 5 seconds of that actually required by Meade. However I noticed the time drift by the Meade system was about 3 seconds over a 2 hour period! Is this typical??

    Also I noted the Sidereal clock was wrong (or did not update when I entered the local time) and I couldn't change it. Should it not change when the local time is entered?

    Also when I moved the scope outside for field trials in ALTAZ mode I noted the system time was wrong....possibly stopped during the move. Issn't the clock powered by the 3volt battery during down time?

    Ok. Reset the time and date in the field.

    First test. Undertook an one star alignment on Sirius. Afterwards Sirius was observed to track down and slightly to the right (i.e. the scope was running too fast in elevation down and biased to the left). Should it not be tracking on Sirius?? I did a "GOTO" Venus. Hmmmm. Unless mistaken Venus is the white star over to the West and not some dark patch of sky near Crux. Ok. I did a two star alignment (Betelgeuse and Crux A). Doing a GOTO to Venus and Jupiter at least now got into the right quadrant. And tracking was a little better.

    Ok I did a second 2 star alignment again, and if not mistaken the tracking got better. Unfortunately here I had to stop as the weather closed in.

    Now will successive alignments improve this tracking and "GOTO" errors or have I done something else wrong??
    Longitude? In the western hemisphere we are minus. That is standard. Something is wrong with your GPS or you are not in this Hemisphere.

    You don't need precise time. Your watch is good enough.

    Sidereal time being correct is dependent on your longitude being correct which is apparently wasn't.

    No. There is no RTC.

    Gotos to the planets are dependent on time/date.

    No, successive alignments won't help. Getting using the best pairs of stars helps as does carefully centering them.
    Uncle Rod

    Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/

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    I spoke with George and he is a nice guy. His conversion is a little out of my price range right now but when I get the Money togeather I plan on upgrading my scope to his conversion. Once I get his conversion I plan on selling my old mother board to offset the cost of his conversion.

  7. #17
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    Default Re: A question to anyone who knows the old LX200 classic well

    Quote Originally Posted by fforoge View Post
    I think I may have an answer to my questions. I was actually able to make the scope track nicely by manual entering the correct sidereal time manually (I did find a way to do this eventually). However a GOTO request still has errors, that require a slew correction.

    I think my mistake was I was assuming that, like most time based systems, everything is based on GMT, which of cause is referenced to Greenwich in the UK.

    My suspicion now is Meade as they there systems based on their own reference point in the USA. If so..why? So my time zone (East coast of Australia) is NOT +10 hours as decreed by convention but another number I have yet to determine (-8?). I will test this when next I get the opportunity.
    Hello,

    I'm actually try to repair an 1996 meade lx200...
    I've the same problem as you to change the wrong sideral time.
    Can you tell me the way you use to entering correct sidereal time ?

    Thanks

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    Default Re: A question to anyone who knows the old LX200 classic well

    Quote Originally Posted by alan.br13 View Post
    Hello,

    I'm actually try to repair an 1996 meade lx200...
    I've the same problem as you to change the wrong sideral time.
    Can you tell me the way you use to entering correct sidereal time ?

    Thanks
    If I recall correctly you get to the sidereal time display and press enter.....I cursor opens up on the time and you enter the values.

    That said... you don't actually need to do it. The way you enter the time, location and zones is likely the cause. All three are "non-standard", by modern standards. By example,
    1. Time Zones run positive going west of GMT. So here in my time zone on the east coast of Australia the time zone is +10. I need to enter -10 into the scope
    2. Time and date are entered as normal.
    3. Location is also the wrong way round. By example, if my longitude is 10 degrees 11 minutes East you need to subtract this from 359 degrees 60 minutes to get the value to put in to the scope. Here this equates to 349 degree 49 minutes

    Crazy ... right!

    I am currently putting a little Raspberry Pi computer with GPS together so that the LX200 gets loaded up with the all this automatically. I'm think this is money well spent when done.
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    Default Re: A question to anyone who knows the old LX200 classic well

    Hi
    I am also working on an LX200 do you have any circuit drawings. This would make fault finding much easier

    Regards

    Roger

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    Default Re: A question to anyone who knows the old LX200 classic well

    Hi and welcome to the forums Roger.

    Most of the members from this thread have not been active for several months or years so you might not get a response.
    One of the members posted another thread and he has some links to a google drive.
    It may or may not still work, see the link to the thread below.

    Feel free to start a new thread on the subject and see if you can get help that way.

    Would anyone be interested in how to upgrade their LX200 classic

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