Tektronix 2465 problem

C

Craig

Guest
Greetings all, I have a Tektronix 2465 that has developed a strange
problem. During operation the trace and all screen readouts slowly creep
to the left of the display. Then they will start to jitter and then
disappear, pressing the beam find button sometimes brings the thing back
to normal operation.


Cranking up the intensity shows that the thing is still working but the
beam appears to be getting pulled to the far left and all I get on the
screen is a wash of electrons being scattered off the inside wall of the
CRT, you can tell the beam is still sweeping and the readouts are still
being written, there are no error codes indicated on the control panel.
Has anyone had this problem before? I do not own a service manual and
would like to get some tips on what the problem might be. Thanks in
advance....



Craig - N7UQA
 
Thanks for the tip, I figured it may be something like this. Would you
know witch IC this is? I do have a second unit for my bench but would
like to get the other one working again since I was using it as a
monitor for my amateur station. If not I'll probably just pick up
another working unit off ebay..



Thanks for the help


Craig - N7UQA



Jim Yanik wrote:
Craig <n7uqa@isomedia.com> wrote in
news:10egqfaftncbsea@corp.supernews.com:


Greetings all, I have a Tektronix 2465 that has developed a strange
problem. During operation the trace and all screen readouts slowly creep
to the left of the display. Then they will start to jitter and then
disappear, pressing the beam find button sometimes brings the thing back
to normal operation.


Cranking up the intensity shows that the thing is still working but the
beam appears to be getting pulled to the far left and all I get on the
screen is a wash of electrons being scattered off the inside wall of the
CRT, you can tell the beam is still sweeping and the readouts are still
being written, there are no error codes indicated on the control panel.
Has anyone had this problem before? I do not own a service manual and
would like to get some tips on what the problem might be. Thanks in
advance....



Craig - N7UQA



I'd say your horizontal output IC is beginning to fail;a very common
problem in the 2445/64 series.Unfortunately,it's a TEK-made IC,no longer
made or stocked by TEK.The only place you can get a replacement is from
another 2445/65 scope.

Some people have tried putting a heatsink on the IC,I don't know if that
would work for you.
Click to expand...
 
Craig <n7uqa@isomedia.com> wrote in
news:10egqfaftncbsea@corp.supernews.com:

Greetings all, I have a Tektronix 2465 that has developed a strange
problem. During operation the trace and all screen readouts slowly creep
to the left of the display. Then they will start to jitter and then
disappear, pressing the beam find button sometimes brings the thing back
to normal operation.


Cranking up the intensity shows that the thing is still working but the
beam appears to be getting pulled to the far left and all I get on the
screen is a wash of electrons being scattered off the inside wall of the
CRT, you can tell the beam is still sweeping and the readouts are still
being written, there are no error codes indicated on the control panel.
Has anyone had this problem before? I do not own a service manual and
would like to get some tips on what the problem might be. Thanks in
advance....



Craig - N7UQA
Click to expand...
I'd say your horizontal output IC is beginning to fail;a very common
problem in the 2445/64 series.Unfortunately,it's a TEK-made IC,no longer
made or stocked by TEK.The only place you can get a replacement is from
another 2445/65 scope.

Some people have tried putting a heatsink on the IC,I don't know if that
would work for you.

--
Jim Yanik
jyanik-at-kua.net
 
Craig <n7uqa@isomedia.com> wrote in
news:10ej2epnco64l20@corp.supernews.com:

Thanks for the tip, I figured it may be something like this. Would you
know witch IC this is? I do have a second unit for my bench but would
like to get the other one working again since I was using it as a
monitor for my amateur station. If not I'll probably just pick up
another working unit off ebay..



Thanks for the help


Craig - N7UQA



Jim Yanik wrote:
Craig <n7uqa@isomedia.com> wrote in
news:10egqfaftncbsea@corp.supernews.com:


Greetings all, I have a Tektronix 2465 that has developed a strange
problem. During operation the trace and all screen readouts slowly
creep to the left of the display. Then they will start to jitter and
then disappear, pressing the beam find button sometimes brings the
thing back to normal operation.


Cranking up the intensity shows that the thing is still working but
the beam appears to be getting pulled to the far left and all I get
on the screen is a wash of electrons being scattered off the inside
wall of the CRT, you can tell the beam is still sweeping and the
readouts are still being written, there are no error codes indicated
on the control panel. Has anyone had this problem before? I do not
own a service manual and would like to get some tips on what the
problem might be. Thanks in advance....



Craig - N7UQA



I'd say your horizontal output IC is beginning to fail;a very common
problem in the 2445/64 series.Unfortunately,it's a TEK-made IC,no
longer made or stocked by TEK.The only place you can get a
replacement is from another 2445/65 scope.

Some people have tried putting a heatsink on the IC,I don't know if
that would work for you.
Click to expand...
I don't recall the exact part number,IIRC U800 is the board
designation,it's a large wide DIP,with a metal exposed substrate and two
threaded studs at each end,on the motherboard.

--
Jim Yanik
jyanik-at-kua.net
 
Jim Yanik <jyanik@abuse.gov> wrote in message news:<Xns951DD3FA081E5jyanikkuanet@204.117.192.21>...
Craig <n7uqa@isomedia.com> wrote in
news:10ej2epnco64l20@corp.supernews.com:

Thanks for the tip, I figured it may be something like this. Would you
know witch IC this is? I do have a second unit for my bench but would
like to get the other one working again since I was using it as a
monitor for my amateur station. If not I'll probably just pick up
another working unit off ebay..



Thanks for the help


Craig - N7UQA



Jim Yanik wrote:
Craig <n7uqa@isomedia.com> wrote in
news:10egqfaftncbsea@corp.supernews.com:
...snipp..



I'd say your horizontal output IC is beginning to fail;a very common
problem in the 2445/64 series.Unfortunately,it's a TEK-made IC,no
longer made or stocked by TEK.The only place you can get a
replacement is from another 2445/65 scope.

Some people have tried putting a heatsink on the IC,I don't know if
that would work for you.



I don't recall the exact part number,IIRC U800 is the board
designation,it's a large wide DIP,with a metal exposed substrate and two
threaded studs at each end,on the motherboard.
Click to expand...

Exactly as Jim said: It's the U800. The Tek number is printed on the
IC (starting with a 15...)
the U800 is marked on print.

check around in the web, a few Ic are being sold be several 2nd hand
sellers. But be awre: Supply is limeted (IC is out of production since
long time). So price is high.

Another way is to by a second 2445/2465 A/B (any combo will havethe IC
you need) as a junker scope. But make shure the U800 of the junker is
alright BEFORE you buy!

Do a google search for "tektronix 2465" This problem is mentioned very
often during the last ten years.


hth,
Andreas
 
Thanks for the tips guys, I'll look for the specific IC but I'll
probably just have to buy a "parts" 2465 off the web. I have always been
a Tektronix scope fan despite some of the problems certain models
develop after years of service.


Craig - N7UQA


TekMan wrote:
Jim Yanik <jyanik@abuse.gov> wrote in message news:<Xns951DD3FA081E5jyanikkuanet@204.117.192.21>...

Craig <n7uqa@isomedia.com> wrote in
news:10ej2epnco64l20@corp.supernews.com:


Thanks for the tip, I figured it may be something like this. Would you
know witch IC this is? I do have a second unit for my bench but would
like to get the other one working again since I was using it as a
monitor for my amateur station. If not I'll probably just pick up
another working unit off ebay..



Thanks for the help


Craig - N7UQA



Jim Yanik wrote:

Craig <n7uqa@isomedia.com> wrote in
news:10egqfaftncbsea@corp.supernews.com:

...snipp..


I'd say your horizontal output IC is beginning to fail;a very common
problem in the 2445/64 series.Unfortunately,it's a TEK-made IC,no
longer made or stocked by TEK.The only place you can get a
replacement is from another 2445/65 scope.

Some people have tried putting a heatsink on the IC,I don't know if
that would work for you.


I don't recall the exact part number,IIRC U800 is the board
designation,it's a large wide DIP,with a metal exposed substrate and two
threaded studs at each end,on the motherboard.



Exactly as Jim said: It's the U800. The Tek number is printed on the
IC (starting with a 15...)
the U800 is marked on print.

check around in the web, a few Ic are being sold be several 2nd hand
sellers. But be awre: Supply is limeted (IC is out of production since
long time). So price is high.

Another way is to by a second 2445/2465 A/B (any combo will havethe IC
you need) as a junker scope. But make shure the U800 of the junker is
alright BEFORE you buy!

Do a google search for "tektronix 2465" This problem is mentioned very
often during the last ten years.


hth,
Andreas
Click to expand...
 
On Thu, 08 Jul 2004 13:01:50 -0700 Craig <nonillion> wrote:

Thanks for the tips guys, I'll look for the specific IC but I'll
probably just have to buy a "parts" 2465 off the web. I have always been
a Tektronix scope fan despite some of the problems certain models
develop after years of service.
Click to expand...
I would seriously consider looking for a working Tek scope of a
different model. If you actually find a "parts" 2465 with a known good
U800 then it is likely to be expensive, and could still die on you at
any time.

I suspect that Jim Y. could recommend some good alternatives that
don't have this flaw.

-
-----------------------------------------------
Jim Adney jadney@vwtype3.org
Madison, WI 53711 USA
-----------------------------------------------
 
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