[Noisebridge-discuss] Bench Supply and Laser Cutter?

[Torrie Fischer]

We've got a huge bin of screwdrivers in the dirty shop. Needle nose pliers 
tend to end up in the big red rolling toolbox.

On Friday, May 01, 2015 01:07:06 AM Zach R wrote:
> Thanks for info everyone.
> 
>   That's great, I thought it was broken way worse.  I can bring my tools
> over and look at it next week.  NOTE, we do not have ANY needle nose pliers
> and the dozens of tools I donated last month (lots of screwdrivers and
> such) were nowhere to be found on monday.  Makes doing these repairs really
> difficult cause I have to bring my tools from home...just an fyi for
> everyone to keep an eye on what we have.
> 
> Do  you know more about the brass contact it uses?  Id be down to order
> another on ebay rather than replicate / jerry rig something for such a nice
> piece of equipment.
> 
> -Zach
> 
> Date: Thu, 30 Apr 2015 14:37:23 -0700
> From: metatecque at gmail.com
> To: tdfischer at hackerbots.net
> CC: noisebridge-discuss at lists.noisebridge.net
> Subject: Re: [Noisebridge-discuss] Bench Supply and Laser Cutter?
> 
> 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.
> 
> Blessings,
> 
> Hilaire
> 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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