Hi all,

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Does anyone have a copy of the 141T schematics from the late '70s? I seem to have a mainframe from one of the last production runs (looks super new inside, with late 70s/early 80s style components) and it's substantially different from any of the docs I can find online.

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For context, I'm a bit confused because I thought I basically had the 140 series schematics memorized (I own a bunch of mainframes). However, I just had one fail on me, pulled the covers, and found all the power supplies dead, this seems improbable given the older designs I'm familiar with, until I realized this one seems to have a relay that switches in the transformer secondary windings on powerup that isn't turning on. As best I can figure, this has some delay circuit controlling it that's failed, but none of this exists in the schematics I have, or in any other mainframe I own.

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Anyway, I just wanted to ask if anyone had seen this before I actually sit down and spending the time to reverse engineer it.

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Thanks,

Daniel

KC1EPN

The SN is 2205A 21694

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Daniel

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Hi Daniel
What is the serial number of the 141T?
Steve

Prefect, Thanks!

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The SN is 2205A 21694

Daniel, Manual Part Number 00141-90915 applies directly to that prefix (as well as the earlier ones).? There are later revisions, I have one 2233A for example.

Dan