Which heatsink for U800 on Tek 2465?

[H]

Hi.

I have a Tek2465 scope. I have what I think is a suitable U800
replacement. I want to heat sink it so it does not ever fail again.

What heatsink is suggested for use?

Thanks
H.

 

[Robert Baer]

H wrote:

Hi.

I have a Tek2465 scope. I have what I think is a suitable U800
replacement. I want to heat sink it so it does not ever fail again.

What heatsink is suggested for use?

Thanks
H.

Use the largest practical one you can find; the pin-finned ones used

on PC CPUs are rather good in transferring heat to the air.

 

[Jim Yanik]

Robert Baer <robertbaer@earthlink.net> wrote in
news:xiLZe.3826$oc.352@newsread2.news.pas.earthlink.net:

H wrote:

Hi.

I have a Tek2465 scope. I have what I think is a suitable U800
replacement. I want to heat sink it so it does not ever fail again.

What heatsink is suggested for use?

Thanks
H.

Use the largest practical one you can find; the pin-finned ones used
on PC CPUs are rather good in transferring heat to the air.

use one that will not contact the cabinet.

--
Jim Yanik
jyanik
at
kua.net

 

[tekamn]

A very small fan (486 cpu style) will do to, and might be easier to
install. Your mileage may vary.

hth
Andreas

 

[Jim Yanik]

"tekamn" <and7@bigfoot.com> wrote in
news:1127802892.726903.238430@g44g2000cwa.googlegroups.com:

A very small fan (486 cpu style) will do to, and might be easier to
install. Your mileage may vary.

hth
Andreas

IIRC,heat was not the cause of failure for the horiz output IC on the
2445/65 series,it was a process problem.If a simple heat sink would have
solved the failure problem,TEK would have juumped on it pronto,as they
ended up replacing MANY of those ICs.and that depleted remaining stocks
much faster than expected.



--
Jim Yanik
jyanik
at
kua.net

 

[H]

Hi Jim,

IIRC,heat was not the cause of failure for the horiz output IC on the
2445/65 series,it was a process problem.If a simple heat sink would have
solved the failure problem,TEK would have juumped on it pronto,as they
ended up replacing MANY of those ICs.and that depleted remaining stocks
much faster than expected.

I'm not disagreeing with you, I know you worked at Tek for a long time
and you are very knowledgable.

However, I keep hearing that this part gets blazing hot and that
eventually causes failure.

I suppose it won't hurt to heatsink it...

H.

 

[Jim Yanik]

H <user@user.user> wrote in
news:MPG.1da515103f3b0fa09897a3@news-server.san.rr.com:

Hi Jim,

IIRC,heat was not the cause of failure for the horiz output IC on the
2445/65 series,it was a process problem.If a simple heat sink would
have solved the failure problem,TEK would have juumped on it
pronto,as they ended up replacing MANY of those ICs.and that depleted
remaining stocks much faster than expected.

I'm not disagreeing with you, I know you worked at Tek for a long time
and you are very knowledgable.

-somewhat- knowledgeable(about TEK stuff),IMO.
There's a wide selection of TEK instruments I never serviced.
Spec analyzers,digitizing scopes,logic analyzers.Some stuff was "factory
only".

However, I keep hearing that this part gets blazing hot and that
eventually causes failure.

I suppose it won't hurt to heatsink it...

H.

Oh,I'm not saying that you shouldn't heat sink it.The fan idea was a bit
overkill,IMO.
But use a low profile HS that will not touch the cabinet.
Maybe even put a patch of insulating tape on the cabinet in that area,just
in case....
..
--
Jim Yanik
jyanik
at
kua.net

 

[DaveC]

Thus spake H:

I have a Tek2465 scope. I have what I think is a suitable U800
replacement. I want to heat sink it so it does not ever fail again.

What heatsink is suggested for use?

I used one like this one:

<http://www.halted.com/commerce/ccp19824-heatsink-to-220-dual-thm6072-
2901.htm>

Its profile is low enough to clear the cabinet yet the fins are above the
adjacent components on the board.

Eliminate the screws (or whatever is on this sink).

Turn it over, of course.

Good idea to put tape on the inside of the case adjacent to the sink.

You'll have to re-route a small flat cable on the PC board so the sink will
sit properly on the IC.

You have to get the heat from the small tab on the IC to the sink. This will
mean some kind of customized spacer made of aluminum, copper, or other
heat-conducting material. The mounting stud goes straight through this tab,
so your spacer will have to have a hole to accommodate this.

xThere is actually a tab at each end of the IC, so if you want to go crazy,
you could use 2 sinks.

Use a *small* amount of heat sink compound between all elements in the heat
path.

Good luck! Long live the (your) 2465!
--
Please, no "Go Google this" replies. I wouldn't
ask a question here if I hadn't done that already.

DaveC
me@privacy.net
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