HP 54201A scope input failure
 

Just picked up an HP 54201A digital scope. It basically works but
both input channels are dead. Will not recognize any inputs, and the
input self test fails. Don't have a service manual (and have been unable
to download one...on dial up here), and don't want to pay a bunch
of $$$'s for one to find out the hybrid circuits are bad.

Can anyone provide *just* the schematics for the input circuitry?
Has anyone else here been able to fix this problem?

Steve

HP 54201A scope input failure
 

Steve wrote:
Just picked up an HP 54201A digital scope. It basically works but
both input channels are dead. Will not recognize any inputs, and the
input self test fails. Don't have a service manual (and have been unable
to download one...on dial up here), and don't want to pay a bunch
of $$$'s for one to find out the hybrid circuits are bad.

Can anyone provide *just* the schematics for the input circuitry?
Has anyone else here been able to fix this problem?

Steve


HI,

Look for O/C inductors on the input stage - they are just
about the first component that the signal passes through,

you'll need good eyes - they'll be tiny....