Long time, no see. Howdy folks!
Shortly after this post (and subsequent interconnect dongle acquisition from a fellow forum user) the Newton stopped powering on entirely, so it went into a box for the last three years (almost exactly to the day!!)
Fast forward to a few days ago, I finally pulled it apart for diagnosis and found the likely culprits. A blown crispy tantalum cap and a blown F1 fuse as a result of that.
Additionally several other of the tantalums read shorted, which is how tantalums fail.
I've purchased the following list of components to replace all the caps, the supercap, and the fuse. Wish me luck!
Item 1, Mouser # 80-T520X337M10ATE025, Mfr Part # T520X337M010ATE0257280, Mfr KEMET, Description Tantalum Polymer 10V 330uF 20% ESR=25mOhms, Quantity 2
Item 2, Mouser # 80-T495X107M16ATE100, Mfr Part # T495X107M016ATE1007280, Mfr KEMET, Description Tantalum Solid SMD 16V 100uF 20% ESR=100mOhms, Quantity 12
Item 3, Mouser # 80-T491C476K20AT, Mfr Part # T491C476K020AT, Mfr KEMET, Description Tantalum Solid SMD 20V 47uF 2312 10% ESR=900, Quantity 2
Item 4, Mouser # 80-T491C336K025AT, Mfr Part # T491C336K025AT, Mfr KEMET, Description Tantalum Solid SMD 25V 33uF 2312 10% ESR=1.8ohms, Quantity 2
Item 5, Mouser # 80-T521B106M35ATE100, Mfr Part # T521B106M035ATE100, Mfr KEMET, Description Tantalum Polymer 35V 10uF ESR=100mOhms 3528-21 20%, Quantity 1
Item 6, Mouser # 80-T491D475M050, Mfr Part # T491D475M050AT, Mfr KEMET, Description Tantalum Solid SMD 50V 4.7uF 2917 20% ESR=1.4ohms, Quantity 2
Item 7, Mouser # 576-0451003.MRL, Mfr Part # 0451003.MRL, Mfr Littelfuse, Description Surface Mount Fuses 125VAC 3A .0227ohms 451 NANO2, Quantity 3
Item 8, Mouser # 80-EDK475M025A9BAA, Mfr Part # EDK475M025A9BAA, Mfr KEMET, Description Aluminum Electrolytic SMD 25V 4.7uF 20%, Quantity 1
Item 9, Mouser # 504-KR-5R5H224-R, Mfr Part # KR 5R5H224 R, Mfr Eaton, Description Supercapacitors .22F 5.5V EDLC Coin Cell HORZ, Quantity 1
The band I was touring around with has been on hiatus since November '23 and recently had a reunion show. I do gig work in the music industry now too. My dream is still to utilize my Newton as my data companion the way it was intended: calendar, contacts, notes and synced with my PowerBook 1400cs.
