[Info-vax] rx2620 power supplies / VRM voltage low

Steven Schweda sms.antinode at gmail.com
Sat Feb 13 10:46:49 EST 2016


> [...] The screw has a very specific head and only the tool fits in it.
> Brute force works for removal but misaligns a center pin in the screw.
> [...]

   It's been years since I did it, and my memory is worth little, so I
know nothing, but I did transplant a 1.6gHz CPU from an rx2600 into a
zx2000 (replacing a 900MHz CPU there), and I don't remember using more
than simple tools to do it.  That is, if I own a "special processor tool
(HP Part Number A7231-67046)" as specified in the manual, I've forgotten
about it, and it's not in the box with the old CPU and power module. 

   From what I can see (on the old CPU), the captive heatsink screws are
plain T-15 (with a slot which might allow a plain flat-blade screwdriver
to work).  I don't see a "center pin" in mine.  Do you have
tamper-resistant screws (with the center pin)?  Tools for those are
cheap at the local cheap-Chinese-tool store.  It's possible that the
screws on the newer/faster CPUs were more exotic, but I don't remember
any serious problems with any of them.

> The phillips screwdriver needed to remove the cpu assembly is ver
> long, 4 inches.

   Phillips?  Not Torx?  Four inches is long?  If you want _long_, then
you want the foot-long T-15 tool needed to reach the case screws on an
early Macintosh.  _That_'s long.  ("That's not a knife...")



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