24ay

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So I got a 1400HD in good cosmetic shape for next to nothing, with the obvious disclaimer of «Don’t have the power brick, can’t test.» Incidentally, I DID have a power brick from a 1400HD that I had years back but have long lost.

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But alas, powering up just illuminates the backlight (sometimes) and all three keyboard lock LEDs light up steady; that’s it.

And this is probably a long shot, but does anyone happen to have a pinout of what the PSU pins voltages SHOULD be? Or would be willing to open a 1400 to test them out? Of all portables I’ve ever opened, this one definitely is not difficult at all (just the screws on the bottom, and you can lift the case), so if you have a 1400 and are willing, it would be much appreciated.

Could this be the classic capacitor leak situation? Does that make sense as a possibility? Some of them do look a little sour on their undersides. I ordered myself a set of assorted electrolytic capacitors with ranges of parts I have seen on the PSU, as well as a capacitor tester (unless you guys just recommend I replace them all anyway while I’m poking around.)

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Now, years back, with the old 1400 HD I had, I tore it apart because of a bad HDD, and found that the PSU will put out voltages without being connected to anything. Naturally these are the expected normal voltages of +12V, +5V, and probably -12V (used by the modem.) I even used this to power an AT board as a silly experiment back then.

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Anyway, with THIS one, I’ve tested all the pin connections coming off the PSU, and about half are «dead», and the ones that work test out +5V. So it appears to me that the 12V side is the «dead» part. This was further hinted because the PSU has a 12V cooling fan on it which was not turning, clearly unpowered. I’m not an electrical engineer and am not too familiar with circuits more complicated than «Battery-Switch-Lightbulb», but I can use a DMM and traced 12V at least as far as the battery connector and a couple regulators.

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Of note, CLEARLY somebody has messed with it before. There were two screws missing from the case and fuse «F1» has been directly soldered across on the underside!

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Источники:

https://forum.vcfed.org/index.php?threads/tandy-1400-hd-psu-bad-i-think.22317/&rut=e1ec1f57954695f83a449abf9307c11e81b52ca405046de1f535b1bdbe2853c4
https://www.digikey.com/en/products/detail/omron-automation-and-safety/A22-24AY/522510&rut=b6bf1abce26e283bec6bdb9adb3231d3246a66bc68691334251b340ab9fe86b1
https://www.ia.omron.com/products/family/1112/lineup.html&rut=477051b189703db51baf03cea7f9bbdae6cebed675c5dc3b40e1a0881cd9600d
https://us.rs-online.com/product/omron-automation/a22-24ay/71063054/&rut=2853557f2f8354d59d338d3cd0e8c11cd72bdb3f965e154b26ad92f96fea147b
https://static.nhtsa.gov/odi/tsbs/2014/MC-10124784-9999.pdf&rut=154aa979fd100a2920666d0775ac022bcac6ac4e5a475262af1b763b926a6ac6
https://us.misumi-ec.com/vona2/detail/222004915061/?HissuCode=A22-24AY&rut=8bf181d14dad27e6959924255bd8e48160f4639e7264a80e688a03748cdc1bb3
https://octopart.com/a22-24ay-omron-1231121&rut=b1dc76c09f6cfc37e1948d385cf8310a0aa2e679c81a27d74ab123e9b83e08b2
https://www.digikey.com/en/products/detail/omron-automation-and-safety/A22R-24AY/2834862&rut=70bf7d5096627cc7b6aa2e7146d1dafadf06f5865eb3ed2af0036f23083e44fe
https://www.bardwallmount.com/unit/W24AY-D10&rut=d18f5c58f44884e890a9027e5f55295299643a95ec577a587373b654b70e0c9d