----- Original Message -----
Sent: Friday, March 19, 2004 3:15 AM
Subject: RE: [M]: Re: help - paralyzed LX200


> >
> > > Dear Colleagues
> > >
> > > I had given my LX200 classic a goto command. It started moving,
> > > and then sounded like it was getting bound and came to a halt
> > > before reaching the target.
> >
> >First, do not switch the scope on again, till you have found the problem.
> >With it switched off, move the Dec drive in both directions with the
manual
> >knob. Does it feel smooth?. If it moves normally, you have really ruled
out
> >the Dec system as the problem (the RA motor is more likely, and is harder
> >to
> >check - with the Dec knob, you are turning a shaft inside the gearbox,
and
> >generating the same motion the motor generates, with the RA knob, undoing
> >the clutch disconnects the drive, and you only move the final drive
gear).
>
> I haven't disassembled an LX200 drive base, but if it's like other Meade
> SCTs, disengaging the RA clutch disconnects the scope from the main drive
> gear. With the clutch loose, if you move the scope manually (ie, grab the
> fork arms and rotate in RA), then the drive gears, including the main
drive
> gear, don't move. But this _will_ test the RA bearings.
Which is _exactly_ what I say...

> OTOH, with the clutch loose, if you press a direction button, the gearing
> moves, but the scope doesn't. So that would test the drive gears. Of
> course, that assumes he can get the keypad to boot up so the direction
> buttons work. But if the bearings are what has been stopping it,
loosening
> the clutch would allow the drive to go through its start-up test (the
sensor
> is on the worm), and the electronics should boot up.
> -John
>
>
> >However now start with this. With the RA clutch disengaged, verify that
the
> >scope will manually slew smoothly and easily in both directions. If it
> >does,
> >you have at least proved there is no problem with the main bearings.
> >... If the manual
> >RA motion is stiff, the problem is with the main bearings/gear.

Best Wishes

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