Tek 2465B horizontal sweep problem

[George Kerber]

I have a very excellent, low hours 2465B that just goes south every few
hours. The horizontal channel and/or sweep works sometimes for a few minutes
to several hours, then drifts off screen. Sometimes it happens almost
immediately at startup. Freeze mist on the horizontal output IC
(155-0241-02) does not restore trace.

Any thoughts?
George Kerber

 

[Jim Yanik]

"George Kerber" <glkinst@earthlink.net> wrote in
news:FVy1c.18352$yZ1.14659@newsread2.news.pas.earthlink.net:

I have a very excellent, low hours 2465B that just goes south every
few hours. The horizontal channel and/or sweep works sometimes for a
few minutes to several hours, then drifts off screen. Sometimes it
happens almost immediately at startup. Freeze mist on the horizontal
output IC (155-0241-02) does not restore trace.

Any thoughts?
George Kerber

Sounds like you need to replace the horiz output IC. This is a high-failure
item for the 2445/65 series scopes.
Bad news #2;TEK does not sell or make them any more.

--
Jim Yanik
jyanik-at-kua.net

 

[Joerg Hau]

Hi

I have a very excellent, low hours 2465B that just goes south every
few hours. The horizontal channel and/or sweep works sometimes for a
few minutes to several hours, then drifts off screen.

Does the beam eventually reappear when you wiggle/press the "x10" time
base magnifier switch?

I recently picked up an old 475 with similar symptoms (except for the
_drift_; either the beam was there or not). Said switch needed just
some contact spray.

Cheers + HTH,

- Joerg


--
joerg dot hau at swissonline dot ch * Lausanne, Switzerland
http://homepage.sunrise.ch/mysunrise/joerg.hau/
"All standard disclaimers apply".
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[Jim Yanik]

Joerg Hau <nospam.joerg.hau@swissonline.ch> wrote in
news:r5q72c.3k2.ln@54693.user.dfncis.de:

Hi

I have a very excellent, low hours 2465B that just goes south every
few hours. The horizontal channel and/or sweep works sometimes for a
few minutes to several hours, then drifts off screen.

Does the beam eventually reappear when you wiggle/press the "x10" time
base magnifier switch?

I recently picked up an old 475 with similar symptoms (except for the
_drift_; either the beam was there or not). Said switch needed just
some contact spray.

Cheers + HTH,

- Joerg

2465 is WAY different than 475 or any 400 series scope.
All the parameters are digitally set by the microprocessor in the 2465.
The uP just reads the front panel switches,and they are checked at startup.

--
Jim Yanik
jyanik-at-kua.net

 

[Joerg Hau]

Hi

2465 is WAY different than 475 or any 400 series scope.

Oops ... from a too-quick glance it looked to me like a 465 with 4
channels ("2x465"), thus I was hoping I might not me _that_ wrong
about the hardware ;-)

Best regards,

- Joerg


--
joerg dot hau at swissonline dot ch * Lausanne, Switzerland
http://homepage.sunrise.ch/mysunrise/joerg.hau/
"All standard disclaimers apply".
remove "nospam." from my address to reply
(this became necessary due to increasing SPAM)