[labnetwork] LED light source for P7 profilometers

[Houpu Li]

Hi Kyle,
I don't know if a DIY component fix would be something you'd like to risk
or if that goes too far - if it shortens the circuit, then it might cause
damages that need a much more expensive fix.
And a disclaimer - this is not really my expertise, my circuit engineering
skill is more on a hobbyist level.

But if you are willing to try, and you have already traced it down and are
certain that it is the LED itself having a problem (instead of a circuit or
LED driver issue), maybe you can just replace the LED bead.
This small board looks fairly simple, and the LED bead looks very similar
to this one:
https://www.digikey.com/en/products/detail/lumileds/LXML-PWC1-0100/3961262
It's a 3V white LED, so if the voltage of your LED is also 3V and the size
matches, I believe it should be compatible or even be the identical model.
The LED chip appears to be surface-mounting with 3 pads on the bottom, so
it requires some techniques to remove and solder it - someone with training
in electrical engineering should be able to do it; they probably also will
have the knowledge to evaluate the compatibility and risks for the
replacement.
Hope this info helps.

Best
Houpu

----------------------------------------------
Houpu Li
Asst. Project Scientist.
Jack Baskin School of Engineering
UC Santa Cruz, California, USA
hli322 at ucsc.edu
houpuli0 at gmail.com
+1-4044229896


On Tue, Jul 9, 2024 at 4:55 PM Kyle Keenan <kckeenan at seas.upenn.edu> wrote:

> Hello LabNetwork,
>
> We have a KLA-Tencor P7 stylus profilometer that has had a dead LED light
> source for two months, and I was just informed by KLA that it will be
> another 3.5 months until the "estimated" ship date of the order I placed
> way back when for a replacement. This seems to be an extremely long time to
> have a tool down for such an easy to fix problem, and I'm hoping someone
> out there has an alternate supplier for the part, or a suggestion for a
> workaround fix. For reference, the part number and description are
> 0266756-00,  ASSY,CBL,LED,P7. I have also attached pictures of our dead
> LED, for reference. Please note: it has to be that shape and size (~17.5 x
> 8mm)or it will not fit in our system. Any help would be appreciated.
>
> Thank you,
> --
> Kyle Keenan
>
> Senior Manager - Laboratory Operations
> Quattrone Nanofabrication Facility
> University of Pennsylvania
> P: 215-898-7560
> F: 215-573-4925
> _______________________________________________
> labnetwork mailing list
> labnetwork at mtl.mit.edu
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>
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