Tek 2465A bootup

[zapvss]

Hi All,
My Tektronix 2465A scope always boots up in Diagnostic mode screen after power up.  I have to to push the "A/B Trig" button to get it out of Diag. mode then it works normally.
It passes all of the tests at boot and everything works just fine after pressing the A/B Trig button.

Is there a setting that can prevent this behavior and have the scope display the trace after passing the tests at boot time?

Thanks
Denis

[alpher]

Are you sure that there are no test fail mesages? May have to tweak readout intensity ?

[zapvss]

Hi Alpher,
No error messages and readout intensity is up high enough to read anything that might show.

[Andy Watson]

Have you tried forcing it to go through its diagnositc routines? It might show-up something that is being hidden by the boot process.

[zapvss]

Yes I have and all 6 tests pass.

[pbarton]

On power-up, the scope automatically performs a set of diagnostic tests.
When the tests have completed, is the TRIG'D indicator on the front panel flashing?

[edavid]

I think you just have to remove the CAL jumper:

http://www.wb0smx.net/?p=2447

[ArcticGeek]

+1 On the cal jumper.

If you remove the cal jumper it will likely boot fine.

[zapvss]

I checked the CAL Jumper and it is connected to the "No Cal" side.  I tried removing it and the scope wouldn't boot up.

[MarkL]

You might want to try clearing CYCLE MODE using EXER 03.  It's described here:

  https://www.eevblog.com/forum/repair/tektronix-2465a-troubleshooting/msg2028619/#msg2028619

This is from from the service manual page 6-18, under "CYCLE ERROR CLEAR".  Cycle mode forces the scope into diagnostic mode on boot until it is cleared, and if I recall correctly, even if there are no more errors left to display.

[zapvss]

Thanks MarkL,
That worked like a charm.  The scope now boots up properly.

Thank You
Denis