BZ stops displaying vectors when hooked up to 9010A

Ok, I thought the board was just dead when I tried RUN UUT. But then I noticed that the start button was still flashing.

So the game is running but I am getting nothing out on the display. I verified that I am getting DVXx & DVYx at the dacs.

Possibilities as I see them:

!CENTER confused resulting in no beam movement
!HST or !LST confused resulting in a window that is sized at center of screen.
!WNDWBLK confused resulting in completely clipped vectors.

!ZBLANK or ZOUT bad. But I don't think this is the case because I don't have the Z input hooked to my scope and the beam seems to be stuck dead center.

So I would like to scope probe the DAC at its output before it has been messed with by centering or windowing circuits. Of course I get nothing on the scope when I try this.

Ideas?

I am SURE I have used the RUN UUT mode on BZ before. Can't figure out why it doesn't want to work now.

Oh and the above is with a known good board.

David

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Received on Thu Jul 3 16:10:33 2003