5070B once more.... (actually 5370A fans)
Many failed electrolytic caps on PC motherboards and in PC power supplies can be traced to a case of industrial espionage gone wrong. Somebody sole the formula for the caps from a Japanese company and sold it to a competitor. That competitor allegedly cranked out over a billion of the caps and cornered the market with their cheap prices. Unfortunately the formula that was stolen was missing a key ingredient... voila, over a billion capacitors in a zillion PC's... and every one of them is destined to fail. The failure mode is goo oozing out the top of the cap.
Modern electrolytics is a different story altogher from traditional electrolytics. My stationary computer failed in the PSU. Sure enougth it was caps. But looking carefully at the errupted caps...
Hotmail® goes with you.
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In message BLU125-W32EB9626ACF899C8949FFCE560@phx.gbl, Mark Sims writes:
Many failed electrolytic caps on PC motherboards and in PC power supplies
can be traced to a case of industrial espionage gone wrong. [...]
While this tale is true, the fact is that even without incompetence,
electrolytics suck.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
The heat sink on the back of my 5370B runs very hot. Can't touch it for more
than a fraction of a second. Maybe some where around 140F. I assume this is
not normal??
73
Connie
K5CM
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Poul-Henning Kamp
Sent: Saturday, May 23, 2009 1:35 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5070B once more.... (actually 5370A fans)
In message BLU125-W32EB9626ACF899C8949FFCE560@phx.gbl, Mark Sims writes:
Many failed electrolytic caps on PC motherboards and in PC power supplies
can be traced to a case of industrial espionage gone wrong. [...]
While this tale is true, the fact is that even without incompetence,
electrolytics suck.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
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They all do that.
Didier
-----Original Message-----
From: time-nuts-bounces@febo.com
[mailto:time-nuts-bounces@febo.com] On Behalf Of Connie Marshall
Sent: Saturday, May 23, 2009 9:53 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] more 5370B
The heat sink on the back of my 5370B runs very hot. Can't
touch it for more than a fraction of a second. Maybe some
where around 140F. I assume this is not normal??
73
Connie
K5CM
-----Original Message-----
From: time-nuts-bounces@febo.com [mailto:time-nuts-bounces@febo.com]On
Behalf Of Poul-Henning Kamp
Sent: Saturday, May 23, 2009 1:35 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 5070B once more.... (actually 5370A fans)
In message BLU125-W32EB9626ACF899C8949FFCE560@phx.gbl, Mark
Sims writes:
Many failed electrolytic caps on PC motherboards and in PC power
supplies can be traced to a case of industrial espionage
gone wrong.
[...]
While this tale is true, the fact is that even without
incompetence, electrolytics suck.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by
incompetence.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe,
go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
time-nuts mailing list -- time-nuts@febo.com To unsubscribe,
go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
Connie Marshall skrev:
The heat sink on the back of my 5370B runs very hot. Can't touch it for more
than a fraction of a second. Maybe some where around 140F. I assume this is
not normal??
Sounds a little too hot (C would give me better indication). Check the
regulated and unregulated voltages. There are 4 transistors there. Do
you have the manual? There's a PDF for it and you want to check out the
A6 board (which often is described together with A1).
+10V is regulated into +5 V and fuse is for 7 A. So about 35W is burned
in Q2 before fuse blows.
+20V is regulated into +15 V and fuse is for 1,5 A. So about 7,5 W is
burned in Q1 before fuse blows.
-20V is regulated into -15 V and fuse is for 1,5 A. So about 7,5 W is
burned in Q3 before fuse blows.
-10V is regulated into -5.2 V and fuse is for 7 A. So about 33,6 W is
burned in Q4 before fuse blows.
So about 80-85 W may need to be fumed out without having the fuses blow.
More if the power-plug is put in 100 VAC rather than 120 VAC.
A well designed switch becomes muke warm, and it makes minor wonders for
reliability. :)
Cheers,
Magnus