Re: [CAD_CAM_EDM_DRO] Re: Stepper sings, but wont walk....

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

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> From: audiomaker2000 <audiomaker@...>
> 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