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Re: Telesciope uncontrollby slewing

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  • garymarkwalker
    Message 1 of 5 , Oct 4, 2011
      --- In lx90@yahoogroups.com, "P. Clay Sherrod" <drclay@...> wrote:
      >
      > What power source are you using; unregulated and low voltage can give you the exact
      > symptoms that you are describing.
      >
      > Dr. Clay
      > _____
      > Arkansas Sky Observatories
      > MPC H45 - Petit Jean Mountain South
      > MPC H41 - Petit Jean Mountain
      > MPC H43 - Conway West
      > http://www.arksky.org/
      >
      > ----- Original Message -----
      > From: "garymarkwalker" <garymarkwalker@...>
      > To: <lx90@yahoogroups.com>
      > Sent: Tuesday, September 13, 2011 9:44 AM
      > Subject: [lx90] Telesciope uncontrollby slewing
      >
      >
      > > Dear All
      > >
      > > Recently my Meade LX90 8"SCT has been playing up by slewing off at high speed, for
      > > no reason, without being commanded to!
      > >
      > > For example, I start to GOTO a certain object and it may find it, but then start
      > > slewing off again (at high speed) for no apparent reason! Sometimers it will sdlew
      > > off it and then come back to its original position!
      > >
      > > Or when I'm doing the initial line-up on the 2 stars, during initualisation, When I
      > > try and move the scope to where the star is (as of course it is never precise at
      > > that stage of GOTO!), the telescope often then slews back to where it originally
      > > was!
      > >
      > >
      > > I have tried doing RESET, CALIBRATE MOTORS, CALIBRATE SENSORS, TRAIN DRIVE, and
      > > even changed the batteries to new ones, but it is still doing it!
      > >
      > > Indeed, sometimes when I have tried to TRAIN the DRIVE, the telescope wont even
      > > keep still during this procedure, but keeps on slewing off somewhere else! It has
      > > also been known to slew up vertically until it is pushing against the battery
      > > compartment unit!
      > >
      > > Also, when I use GOTO to find an object, often, after the initial slewing to find
      > > the object, the final slow-motion slewing process takes longer than it should do!
      > >
      > >
      > > Naturally, all this is extreamly frustrating!
      > >
      > > The only thing that I wondered might have caused this, is that sometimes I use the
      > > GOTO to find planets and stars in full daylight by using the SYNCH function and
      > > Enter to synch on the Moon (if its visible!) and then I can often find other bright
      > > objects!
      > >
      > > I wondered if my slewing around, might have caused the scope to "remember" these
      > > movements when I', back to doing conventional nightime GOTO operations, thus
      > > causing it to slew at random!
      > >
      > > Any suggestions, please on how to stop my scope playing up?
      > >
      > > I have checked that the DATE, Time, etc are correct and they were.
      > >
      > >
      > >
      > > ------------------------------------
      > >
      > > To unsubscribe from this group mailto lx90-unsubscribe@...! Groups
      > > Links
      > >
      > >
      > >
      > >
      >
    • garymarkwalker
      ... DEar Sir Funninly enough, since I changed from using the EASY align method to AUTOMATIC align, the telescope has been working fine, so far!
      Message 2 of 5 , Oct 4, 2011
        --- In lx90@yahoogroups.com, "autostaretx" <rseymour@...> wrote:
        >
        > First, SYNCing on things during one session will only affect future sessions if you PARK (and don't align the next time).
        >
        > For your symptoms: does it only Slew "off" in one axis, or in both?
        > If so, which axis?
        >
        > I *suspect* an intermittent bad connection... it causes some of the intermediate commands to get garbled to one of the axis control boards, so that motor goes somewhere strange. Then the connection improves, the Autostar sees that the position is incorrect, and it commands the scope to slew to the correct position.
        >
        > So i'd start by the usual mantra of: reverse the handbox cable end-for-end. If that affects the symptoms (say it moves from Az to Alt motor), then it's simply that cable at fault.
        > Inspect and Clean the sockets in the Autostar and the scope.
        > If those steps don't solve it, open the inspection plate on the bottom of the base and peer in with a flashlight... poke at the cable connections with a plastic straw or chopstick to improve their seating.
        > If you can *see* that a connector is trying to "walk" off its pins, you're probably seeing the fault. Then ask yourself "what's causing it to walk?" and try to address that.
        >
        > good luck
        > --dick
        >
        > --- In lx90@yahoogroups.com, "garymarkwalker" <garymarkwalker@> wrote:
        > >
        > > Dear All
        > >
        > > Recently my Meade LX90 8"SCT has been playing up by slewing off at high speed, for no reason, without being commanded to!
        > >
        > > For example, I start to GOTO a certain object and it may find it, but then start slewing off again (at high speed) for no apparent reason! Sometimers it will sdlew off it and then come back to its original position!
        > >
        > > Or when I'm doing the initial line-up on the 2 stars, during initualisation, When I try and move the scope to where the star is (as of course it is never precise at that stage of GOTO!), the telescope often then slews back to where it originally was!
        > >
        > >
        > > I have tried doing RESET, CALIBRATE MOTORS, CALIBRATE SENSORS, TRAIN DRIVE, and even changed the batteries to new ones, but it is still doing it!
        > >
        > > Indeed, sometimes when I have tried to TRAIN the DRIVE, the telescope wont even keep still during this procedure, but keeps on slewing off somewhere else! It has also been known to slew up vertically until it is pushing against the battery compartment unit!
        > >
        > > Also, when I use GOTO to find an object, often, after the initial slewing to find the object, the final slow-motion slewing process takes longer than it should do!
        > >
        > >
        > > Naturally, all this is extreamly frustrating!
        > >
        > > The only thing that I wondered might have caused this, is that sometimes I use the GOTO to find planets and stars in full daylight by using the SYNCH function and Enter to synch on the Moon (if its visible!) and then I can often find other bright objects!
        > >
        > > I wondered if my slewing around, might have caused the scope to "remember" these movements when I', back to doing conventional nightime GOTO operations, thus causing it to slew at random!
        > >
        > > Any suggestions, please on how to stop my scope playing up?
        > >
        > > I have checked that the DATE, Time, etc are correct and they were.
        > >
        >

        DEar Sir

        Funninly enough, since I changed from using the EASY align method to AUTOMATIC align, the telescope has been working fine, so far!
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