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