Xref: utzoo comp.sys.att:2194 unix-pc.general:199
Path: utzoo!utgpu!water!watmath!clyde!ima!bbn!rochester!brown
From: brown@cs.rochester.edu (Chris Brown)
Newsgroups: comp.sys.att,unix-pc.general
Subject: 3b1 death
Keywords: heat, power
Message-ID: <6126@sol.ARPA>
Date: 22 Jan 88 22:06:20 GMT
Organization: U of Rochester, CS Dept., Rochester, NY
Lines: 34

I lost power at home, and my Global surge protector kept power off to
my 3b1 (2MB, 67M disk).  5 minutes after repowering, machine dies:
no diodes, no cap.lock light, screen frozen, no reset button.  However,
fan, disk still working, screen lit if frozen.  Power down and wait,
power up, a few minutes go by same thing happens.  Power down and wait,
insert diagnostic floppy, powerup and part way thru parity checking,
start getting errors and wham same lockup happens.

Open it up in the shop (not so hard...put it on its back to get started),
crank open the motherboard cover, and it runs for 3 hours no problems
except the cooling-fin gizmo in the power supply is killingly hot and the
68010 chip is possibly a bit overheated.  I had thought hot chip on motherboard,
or dying piece of powersupply (not all of it, of course).

Now I'm stuck.  There were no papers over vents, the machine was on an
uncluttered desk, the fan was making a new speed oscillation effect
(wurra wurra wurra) but the airstream was strong and seemingly cool. Room
temp was 69 or less.  Machine is 5 months old, ran in hotter temps no problem.

I don't see how power loss could hurt. My technician here thinks the cooling
is marginal for the stuff in the cabinet and wonders if another fan outside
to increase the partial vacuum would help suck more air thru...I dunno
about that.

So I guess my question is whether this sounds like a heat problem, have
others beefed up their cooling or felt like they needed to, does it make
sense to drop a new 68010 chip in with no further evidence, should I go
to a heatgun (ugh), or what.  I am working on AT&T service but not making
contact yet, and I don't see what they would do that my local technician
hasnt
done yet.  Any suggestions sincerely appreciated.  And thanks to you with
advice about the fast clock.    

Chris (Life sucks when your 3b1 is sick) Brown