Re: Stepper sings, but wont walk....

Guys, what can I say...you are AWESOME...all of you.
The only thing though is... did anyone remember that I mentioned
that I had swapped out every board in the machine with known to work
ones? I remember those little silver "button" type deals on the SMD
cards, but nowhere else in the machine. It would be a huge
coicedence if a "was working fine" card did exactly the same thing,
on the same axis when swapped in wouldn't it?


Sean

--- In CAD_CAM_EDM_DRO@y..., "Raymond Heckert" <jnr@a...> wrote:
> If You have a SERIES-I, then you're (probably) not looking for a
little
> black cylinder. Look for a TO-3 case on each of the (3) SMD
boards. I
> think you'll want to look at Q4 &Q13, and Q9 & Q18. In the same
area, is
> the ACC board- look at Q1, Q6, Q11& Q17, Q19, Q21 & Q16, Q18,
Q20). Behind
> those sets of boards is the power/heatsink panel. Q1 thru Q4
(2N6521)are
> common problems. We replaced ours with 2N6547's for a couple bucks
each.
> Also some power diodes on the heatsink, we replaced with 1N3211.
Contact me
> off-list if you have a SERIES-I, I have Maint Manual, thru Boss 6.
>
> RayHex
>
> ----------
> > From: audiomaker2000 <audiomaker@s...>
> > To me, a transistor is a tiny little back cylinder with 3 little
> > wires coming from it,
> >
> > Ok, based on that, most of the transistors, capacitors, and
> > resistors are located on the cards that I swapped out. There are
> > also the big blue capacitors in the supply line and some really
> > pretty Mr T looking resistors which are hard to tell if they are
pre-
> > or post drive card.
> >
> > So am I looking for a little black cylinder with 3 wires that
isn't
> > on a card?
>
> > Sean (feeling pathetic)
> >
> > > > > > Hey all,
> > > > > > I have been trying to repair a Bridgeport Boss that has a
> > > > stepper
> > > > > > which when told to move via the stock control "sings"
and
> > will
> > > > sort
> > > > > > of vibrate but wont actually turn. I've replaced every
card
> > in
> > > > the
> > > > > > machine with those which I pulled from my retrofit
machine
> > (and
> > > > > > which are known to work), and the result is the same. I
> > checked
> > > > > the
> > > > > > motor itself by switching it to a different axis circuit
and
> > the
> > > > > > stepper works fine.
> > > > > > So, I'm wondering what else besides the cards (drives,
and
> > stock
> > > > > > CNC) that could cause such a condition? I'll probably
just
> > > > > retrofit
> > > > > > this one too, but it is making me quite curious. All
that
> > seems
> > > > to
> > > > > > be left is cap's and wires.
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > Sean