[labnetwork] LED light source for P7 profilometers

[Kyle Keenan]

 Hi Houpu,

It's definitely a dead LED (we have another P7 system and I tested that
working LED on the aforementioned system). I don't know if ours is a 3V
LED, but the link you provided sure looks like the same thing on our PCB.

Thank you!
Kyle

On Wed, Jul 10, 2024 at 1:29 PM Houpu Li <houpuli0 at gmail.com> wrote:

> 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
> <https://urldefense.com/v3/__https://www.digikey.com/en/products/detail/lumileds/LXML-PWC1-0100/3961262__;!!IBzWLUs!SBq9qAo9aUN0g9IcTfFuvpqcdS3KGqUS6onxqFLtbATkwDtDivxLQ5_QWzBePu9tYL9A2BqA5WGhQa5W41Lx$>
> 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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>> <https://urldefense.com/v3/__https://mtl.mit.edu/mailman/listinfo.cgi/labnetwork__;!!IBzWLUs!SBq9qAo9aUN0g9IcTfFuvpqcdS3KGqUS6onxqFLtbATkwDtDivxLQ5_QWzBePu9tYL9A2BqA5WGhQTuWCJ5_$>
>>
>
>
>

-- 
Kyle Keenan

Senior Manager - Laboratory Operations
Quattrone Nanofabrication Facility
University of Pennsylvania
P: 215-898-7560
F: 215-573-4925
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