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From: Andreas Tekman on 23 Sep 2009 08:15
Hello everybody,

I have an Tektronix 2465A , Serial number B 033501. After power up
the on screen display shows a

ALL 00 PASS <017F>.

Presing A/B trigger leaves this screen and the 4 traces forthe 4
channels appear.
I have a service manual.
Well, I suspect a problem with the controller board, but I am not
shure.

Using an external xtal controlled TG501 or similar:
Errorneous behaviour shows up when I use the cursor-guided time
measurement: It works correct until 20 us/div. But for sweep speed 10
us/div and faster: Deviation ist more than 20%.. That means, even if I
use a constant 10kHz or 20 kHz as an input, measurement is correct
with the 20us/div setting. Using a 10us/Div setting and readjusting
the cursors, it's approx. 20% wrong.


Has anyone seen this before?
Or a good point to start the repair procedure?

Svc. Manual doesn't give me a good clue. This error message does not
show up.


Andreas
From: JW on 24 Sep 2009 07:09
On Wed, 23 Sep 2009 05:15:48 -0700 (PDT) Andreas Tekman <and7(a)bigfoot.com>
wrote in Message id:
<e1dd87d3-8a44-48a0-afdc-550d01c80744(a)j9g2000vbp.googlegroups.com>:

>Hello everybody,
>
>I have an Tektronix 2465A , Serial number B 033501. After power up
>the on screen display shows a
>
>ALL 00 PASS <017F>.
>
>Presing A/B trigger leaves this screen and the 4 traces forthe 4
>channels appear.
>I have a service manual.
>Well, I suspect a problem with the controller board, but I am not
>shure.
>
>Using an external xtal controlled TG501 or similar:
>Errorneous behaviour shows up when I use the cursor-guided time
>measurement: It works correct until 20 us/div. But for sweep speed 10
>us/div and faster: Deviation ist more than 20%.. That means, even if I
>use a constant 10kHz or 20 kHz as an input, measurement is correct
>with the 20us/div setting. Using a 10us/Div setting and readjusting
>the cursors, it's approx. 20% wrong.
>
>
>Has anyone seen this before?
>Or a good point to start the repair procedure?
>
>Svc. Manual doesn't give me a good clue. This error message does not
>show up.
>
>
>Andreas

Hi Andreas, you might want to sign up and post your question here:
http://tech.groups.yahoo.com/group/TekScopes/

There's a *lot* of 24XX experts there.
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