[Noisebridge-discuss] Bench Supply and Laser Cutter?

Hilaire Nollette metatecque at gmail.com
Thu Apr 30 21:37:23 UTC 2015

I did a little maintenance on the laser cutter a year and a half ago, there
should be a brass connection on the left side. .. if you duplicate this
connection on the right you will be good to go, do not solder directly to
the tube, you can remove the rubber insulation on the right and solder a
brass crimp connector to the wire.
On Apr 30, 2015 12:04 PM, "Torrie Fischer" <tdfischer at hackerbots.net> wrote:

> The laser tube needs wired up. It is sitting inside the tube compartment in
> the laser cutter itself. Thats about as much as I know :)
> On Thursday, April 30, 2015 07:29:48 AM Zach R wrote:
> > Hey all,
> >   It was great to see some of the old faces at NB on Monday.  We had
> Michael
> > L, Rubin, Jake, Miloh, Kevin and some other peeps of the OG variety
> holding
> > it down !  Felt like old times :)
> >
> > Me and Jake took a stab at the blown bench supply that everyone was using
> > for years (the 15V x2 output adjustable one).  It's seen a lot of use,
> > love, and abuse and it would be nice to have it going again.  It has been
> > moved to the hackershelves now since it was taking a lot of time to
> repair
> > and it got late.  Here is the diagnosis I made:
> >
> > 1) both outputs are good voltage-wise and adjust properly
> > 2) Current control on both sides is shot, appears worse on the left as it
> > actually displays a negative number (hah) 3) I believe the current is
> > controlled by 2 logic chips using a sense resistor.  Those chips are
> CD1044
> > and CD4066 I believe. 4) I recommend replacing those chips and / or
> > investigating the current control circuitry on the power converter board.
> > 5) Note power converter boards have 2x pico fuses each that check out
> fine
> > (they are yellow)
> >
> >
> > And I've been meaning to ask: what exactly is wrong with the laser
> cutter?
> > Does it need some expensive part?  I would LOVE to take a stab at
> repairing
> > this since its one of the finest pieces of machinery we have at NB.
> >
> > Best,
> > Zach
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