Question about the wafersaw

Mary Tang mtang at stanford.edu
Tue May 16 22:58:47 PDT 2006


Oh fiddlesticks...  Thanks Josh, for the info and detail.  I'm sure it 
will help in troubleshooting...

M

Josh Ratchford wrote:

> Hi Mary and wafersaw users,
>  
> I was so excited about the wafersaw being up that I decided to use it 
> immediately.  Things worked very well for me and I was able to dice up 
> my bare Si [111]wafer into 2 cm x 2 cm chips.  Unfortunately the 
> "theta stop" error started prompting again when I pressed unload to 
> remove my diced wafer. 
>  
> Sorry for bearing the bad news.
>  
> Josh
>
>  
> On 5/16/06, *Mary Tang* <mtang at stanford.edu 
> <mailto:mtang at stanford.edu>> wrote:
>
>     Hi Il Woong and others --
>
>     The wafersaw is UP!  It turns out that Ed Myers had seen this problem
>     years ago and had been told it was an EPROM problem.  On hearing this,
>     Cesar reset the EPROM board and it works.  Not that this makes any
>     sense, but now the motor is rotating in the right direction and
>     working
>     fine.  So, the wafersaw is now available and working well.
>
>     Mary
>
>     Il Woong Jung wrote:
>
>     >Hi Mary,
>     >
>     >I have just talked to the crystal shop in Ginzton.
>     >The wafersaw there has been down for several months now.
>     >It does not seem like it will be fixed anytime soon.
>     >It seems like vendors will be the way to go temporarily.
>     >
>     >Il Woong
>     >
>     >-----Original Message-----
>     >From: Mary Tang [mailto:mtang at stanford.edu
>     <mailto:mtang at stanford.edu>]
>     >Sent: Tuesday, May 16, 2006 3:27 PM
>     >To: Seoung-Jai Bai; wafersaw at snf.stanford.edu
>     <mailto:wafersaw at snf.stanford.edu>
>     >Subject: Re: Question about the wafersaw
>     >
>     >Hi everyone --
>     >
>     >Sorry about the wafersaw.  The good news is that the theta/rotation
>     >motor is OK (repairing this, I understand, is a nightmare.)  However,
>     >the reason why the motor isn't rotating properly isn't clear, but
>     >suspicion is the driver board.  Elmer and Cesar are going to try
>     a few
>     >other things to ensure that the limit switches are OK, and then
>     order a
>     >replacement board if nothing obvious shows up.
>     >
>     >If you desperately need dicing services, there is a dicing saw in
>     >Ginzton labs, which I believe is available as a service to Stanford
>     >researchers.  There's also a website which lists some local
>     dicing services:
>     >
>     >http://snf.stanford.edu/Process/Resources/Dicing.html
>     >
>     >One that is not list is American Dicing (different from America
>     >Precision Dicing, which a lot of people use.)
>     >
>     >Again, sorry about the problem, but Elmer and Cesar are on the job.
>     >
>     >Mary
>     >
>     >
>     >
>
>
>     --
>     Mary X. Tang, Ph.D.
>     Stanford Nanofabrication Facility
>     CIS Room 136, Mail Code 4070
>     Stanford, CA  94305
>     (650)723-9980
>     mtang at stanford.edu <mailto:mtang at stanford.edu>
>     http://snf.stanford.edu
>
>
>




More information about the wafersaw mailing list