Component level repair (Was: Re: Setting up a VAXstation)
bpope at wordstock.com
Fri Oct 5 14:33:57 CDT 2007
And thusly were the wise words spake by Liam Proven
> Fascinating. The snag is, I know very little about electronics below
> the level of a broad knowledge of TTL, the rudiments of circuits and
> gates and so on. I have a bit of theory, no practice. I could not
> diagnose a faulty chip or anything; my troubleshooting consists of
All you need to start with is a logic probe. Then for simple logic
chips like AND, OR, NOT you would place the logic probe on the one
or two inputs o see if they are high or low. Then from that you
would know what the output should be. For chips that were a little
more complex you would use the truth table from the datasheet for
the particular chip to see what the output should be for each
combination of input(s).
> Well, aside from 1 old Sun (SPARCstation IPX), the soon-to-arrive
> VAXstation, an Amiga and 2 STs and a QL, all my kit is Macs and PCs.
> The PCs range from a 386 to an Athlon XP, Macs from an SE/30 to a Blue
> & White G3/400MHz. So I don't run what most people here would consider
> "old hardware", I suppose!
I know for the Amiga Commodore provided schematics...
> I am, a bit like Chuck, mainly a software person, but one who's
> competent with hardware to a basic level. I know bugger-all about
> electronics and while I regret that, I'm not inclined to fix it now. I
> just have an aesthetic appreciation for the way things /used/ to be
I am also mainly a software person, but I am slowly teaching myself
electronics because I would like to know how the "other side" works! :)
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