I picked up two non-working Tek Scopes a TDS540 and a TDS520.
Previous owner swapped the processor boards, unprotected the
calibration ram and let 'er rip. Apparently there was all manner
of complaining from the scope before it locked up.
Not sure which board that happened to. I'd like to learn as much
as I can before I go poking around and make things wose

I'm guessing from the original symptoms that I need to change all the
electrolytic caps. But what to do about the calibration constants?
The processor boards have the same part number and EPROM revision,
so I'm assuming the board can figure out which acquisition system
it's hooked to???
Did he just mess up the factory cal? Will the self-test/cal
set things back so it works ok? Is there any reasonable way to
get factory cal constants stuck back into nvram?

There's mention of a magic diskette for a PC that controls the
calibration over GPIB, but I can't find any documentation on it.

The programmer manual mentions a cal command that steps thru the cal
procedure, but not clear whether the user instructions come from the
instrument ROM or the program running on the PC.

Anybody used such a thing and can give me some idea of what to expect?
I can write a GPIB program to do the setup if I knew how to
get it into the right mode to accept same. Jim??

I do have a working TDS540 for comparison, but I'm afraid to mess with it.

Thanks, mike
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