Re: 2467B No B Sweep


thespin@...
 

I've tried cleaning U500 and U900 to no avail, and then I swapped U900 and U700 again to no avail. Will continue searching for sweeps that might work and looking at that opamp.

On Tue, Mar 19, 2019 at 01:15 PM, Siggi wrote:


On Tue, Mar 19, 2019 at 8:54 AM <thespin@gmail.com> wrote:

It’s not. The proper lights come on suggesting the scope is trying to run
the B sweep, but it isn’t running.
I would start by pulling, cleaning and re-seating U900. Second perhaps swap
U900 and U700.
If that doesn't help, you might be able to narrow this down a bit by
experimenting with various A/B sweep speed combos and B delay/trigger
settings. If there's any combo that will produce a sweep, then you can
start eliminating problems.
If there's no combo that'll start the sweep, then I'd focus on the constant
current generator op-amp (U910A in my 2467 schematic), and then on the
delay ref outputs from the A5 board.

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