hp28s need repair ?. Autotest fails
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03-01-2024, 07:37 PM
Post: #11
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RE: hp28s need repair ?. Autotest fails
For opening, I’ve followed this article https://www.teawea.com/open-a-hp-28s-calculator/. Using a dremel it’s easy.
For the memory malfunction, i didn.t have any doubt, I could not store more than 3 rows in stack, and had some screen clear when attempting to store some var into the calculator. For replacing the chip , i ‘ve used hot air desoldering tool. Be carrefull to protect with tape the 2 Saturn chip as they are very fragil. Solder new chip was not difficult at all.[/align] |
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Messages In This Thread |
hp28s need repair ?. Autotest fails - tlfrance - 01-01-2024, 03:22 PM
RE: hp28s need repair . Autotest fails - tlfrance - 02-01-2024, 05:42 PM
RE: hp28s need repair ?. Autotest fails - rprosperi - 02-01-2024, 07:41 PM
RE: hp28s need repair ?. Autotest fails - tlfrance - 02-02-2024, 09:47 AM
RE: hp28s need repair ?. Autotest fails - Steve Simpkin - 02-01-2024, 09:45 PM
RE: hp28s need repair ?. Autotest fails - Steve Simpkin - 02-01-2024, 09:49 PM
RE: hp28s need repair ?. Autotest fails - tlfrance - 02-02-2024, 09:53 AM
RE: hp28s need repair ?. Autotest fails - tlfrance - 02-26-2024, 05:41 PM
RE: hp28s need repair ?. Autotest fails - vaklaff - 02-26-2024, 08:04 PM
RE: hp28s need repair ?. Autotest fails - johnb - 02-26-2024, 10:10 PM
RE: hp28s need repair ?. Autotest fails - tlfrance - 03-01-2024 07:37 PM
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