Testing a 1488 line driver...

[Gene Buckle]

> Both plus and minus 12V?  You do need both.
>
I didn't check for -12V. I'll do that before I go to the effort of pulling 
the chip and replacing it.

> If there's no change in the LED indicator,  and the input that drives it is
> changing,  then yeah,  it's probably toast.
Thanks!

g.

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