Electronics > Repair
Reverse engineer Dallas DS1742W?
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Stray Electron:
Zebity,

   Is that what is used in the SGI Indigo?  I still have one and one of these days i intend to fire it up again (hoping that I can remember the PW!)
zebity:
Hi Stray Electron,

no Indigo uses DS1286 , see here for details on how to drill and replace battery: https://forums.irixnet.org/thread-1370-post-8924.html
Glitchworks also have a very nicely build replacement:  https://www.tindie.com/products/glitchwrks/gw-1286-1-dallas-ds1286-maintainable-repair-board/

So you are well served for Indigo.

The DS1742W is in the "big iron": Orign/Onyx 350, Tezro and Fuel.

These machines actually have 2 RTC chips with the Dallas and Snaphat, both of which now have end of life batteries and so it is important that replacement / quality repair solution is found.

Cheers from Oz,


zebity/jwhat/John.
amyk:
Various PC motherboards had the same problem, and the solution is the same: cut into the chip to disable the battery and connect a new external one.
james_s:
I recently worked on an older dental xray digital sensor and a DS1742W was about the perfect size to use as a test subject. At some point I'd still like to shoot this on film which results in a much higher resolution shot but my friend's business is in the process of moving so I don't currently have access to that machine. Anyway this gives a reasonable idea of what's inside this part.
helius:
It appears the DS1742W and other Timekeeper modules have been cloned already, for use in Tektronix DSOs.
http://www.ebay.com/itm/293776182478
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