[Noisebridge-discuss] Bench Supply and Laser Cutter?

Torrie Fischer tdfischer at hackerbots.net
Thu Apr 30 19:04:16 UTC 2015


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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