RX02 / DSD440 problem

From: Tom Leffingwell <tom_at_sba.miami.edu>
Date: Wed Feb 27 20:01:39 2002

On Wed, 27 Feb 2002, Pete Turnbull wrote:

> Then it's possible that the drive to the stepper motor that turns the
> leadscrew is, er, screwed. It might only be one phase; if you can turn it
> easily by hand when it's powered up, then it's probably not being driven at
> all so look for a destroyed driver or lack of 12V (or is it 24V? ).

I can't turn it with power applied, so that seems to be okay.

> If it tends to settle into certain positions and won't step but does
> sort of vibrate and isn't very easy to turn by hand when the power is
> on, it's probably just one phase; look for a blown driver transistor
> (if the drive has such) or a faulty stepper driver IC. It's also
> possible (though unlikely, in my experience) that one of the coils in
> the motor has burnt out. You can check that with an ohmmeter,
> comparing it to the working one.

I'll give that a shot. I wish I had schematics for this thing. I don't
suppose anyone does?
Received on Wed Feb 27 2002 - 20:01:39 GMT