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["Ye, Zhenyu" <yezhenyu AT uic.edu>]

Hi Mike,

Thanks a lot for checking the cables. It is good to find the cause of the 
problem for FST-TEST-07. Please find the answer to your question below.

> On Sep 9, 2020, at 4:37 PM, Capotosto, Michael <capotosto AT bnl.gov> wrote:
> 
> Hey Zhenyu, 
>  
> Apologies for the delay. 
>  
> I did some testing on FST-TEST-07 - I did indeed miss a solder bridge on 
> the heel fillet of the Nicomatic connector, shorting OUT6P and OUT6N. I 
> removed the excess solder. This was a joint that I had made, not the 
> vendor. This goes to "APV3" on the Outer hybrid. Does this correspond to 
> the "APV Chip #7" you mention below?

Yes. This is correct.

Zhenyu

>  
> FST-TEST-XX - I checked more thoroughly and I don't see any solder bridges. 
> I paid special attention, and measured continuity and termination of OUT5P 
> and OUT5N - which corresponds to this "APV Chip 6" if I'm understanding 
> right. It doesn’t have any measurements that stick out – I can see the 
> termination on both wires of the pair, I have continuity through the cable 
> as well.
>  
> FST-TEST-XX was the first cable we made by the vendor if memory serves. I 
> don’t recall having them make any changes – All of the boards were 
> assembled at once. KC Electronics assembled the purple cable to one board 
> (FST-TEST-XX no label) and gave it to us for inspection, before doing the 
> remainder of the batch. Outer 2 APV does have the pin placement correct 
> (i.e. there aren’t swapped pairs), but I’ll have to double check tomorrow 
> time permitting, to make sure they didn’t cross-pair or invert pairs of any 
> of these signals on the first board. It would be a very easy mistake to 
> make, as this purple cable we ordered unfortunately has almost a 6-8” lay.
>  
> Thanks, 
>  
> Mike 
>  
>  
> From: Xu Sun <sunxuhit AT gmail.com> 
> Sent: Tuesday, September 1, 2020 11:53 AM
> To: Ye, Zhenyu <yezhenyu AT uic.edu>
> Cc: Capotosto, Michael <capotosto AT bnl.gov>; Star-fst L 
> <star-fst-l AT lists.bnl.gov>
> Subject: Re: [Star-fst-l] Inner Signal cables - FST-TEST-07 and FST-TEST-XX
>  
> Hi Mike,
>  
> To follow up Zhenyu's email, please find a summary slide for the cable 
> check in the attachment.
>  
> Hope this helps.
>  
> Best,
>  
> Xu
>  
> On Tue, Sep 1, 2020 at 10:26 AM Ye, Zhenyu <yezhenyu AT uic.edu> wrote:
> Hi Mike,
> 
> I just dropped off two cables, FST-TEST-07 and FST-TEST-XX, to you 
> (Building 510 address) at FedEx. They are expected to be delivered this 
> Thursday (tracking number 396389239275).
> 
> We had some issues with these two cables:
> 1. FST-TEST-07: a chip (if we count chip 1-8, I think it was chip #7) is 
> missing from the readout. This problem is reproducible
> 2. FST-TEST-XX: when I first used it, a chip (chip #6) was missing from the 
> readout. Next time (a couple of weeks later) when I used it, chip 6 is in 
> the readout but the pedestals of the chip showed abnormal behavior. 
> Xu will send some plots showing the problems later, which should confirm 
> which chip it was.
> 
> I think we need to find out the cause of these problems and also implement 
> a QC procedure for the inner signal cable assembly for production. 
> 
> Best,
> Zhenyu
> 
> https://urldefense.com/v3/__https://www.fedex.com/apps/fedextrack/?action=track&tracknumbers=396389239275&language=en&opco=FDEG&clientype=ivother__;!!P4SdNyxKAPE!W_r3sToFmcMzO4e2ayNJ89R8qVYTJDGfCWY9pG5uZ--jxVTWxBfDgIFqXN1tvRutyusoInI$
>  
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