Electronics > Repair

TDS3014 adventures

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james_s:
I briefly considered the first option, then decided I don't want to invest money in another stupid potted block, I'd just be dealing with it again 20 years from now when the parts are even more hopelessly obsolete niche items. Height would also be an issue as you suspect, the housing for the rear accessory port where the comm module, DSI interface or printer install only clears one side of the (socketed) DS1742 by about 1/8" so an offset adapter would be necessary. Given this constraint and my dislike for the potted battery, the surface mount PowerCap package seemed like the obvious choice, even if the replacement PowerCap becomes obsolete it's not potted so I can easily hack a new battery into it later.

I also like option 2 and considered that as well, I came across the DS1744p before locating a suitable RTC though. I may design something around the DS1558 just for giggles, I would not be the least bit surprised if that's what lies within the DS1742 and related parts. I know from x-raying similar Dallas bricks that they contain off the shelf ICs which are almost certainly Dallas' own offerings. The DS1386 for example has a large QFP that may well be a DS1588. The limiting factor in the imaging of these is in digitizing the film as I lack a proper film scanner.

james_s:
DS1558 won't work, the register map is different, it has a lot more features and some things are moved around. Maybe there is another similar part that is the same as used in the DS174x parts.



james_s:
In retrospect I should have xrayed the virgin DS1742W before I hacked out the dead battery. Anyone got a dead one that hasn't been hacked up? Doesn't *really* matter but it would be cool to add that to the collection of images of these things.

2N3055:
How about M48T12 ?

james_s:
It's 5V only so it wouldn't work in these scopes. If someone wants to send me one I'm happy to xray it though.

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