Re: Tektronix DSA602 boot up problem

Tom Norman

Pretty amazing machine for it's time. Been toying around with the idea of getting a Rigol for every day use, but I've not been able to bring myself to the point of dissing my DSA :)

The service manual indicates that the executive processor tries to communicate with the digitizer (IO Board I believe) and the display card via the back plane. If this communication attempt fails, it gets stuck at the "Comm test in progress" point of the startup sequence. I did have this error once when I upgraded the ROMs in my 602A. After much frustration, it turned out to be a mis-seated ROM chip (one leg had bent under the chip) on the display card. You may want to try to reseat these cards in the back plane.

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