HP 54201A scope input failure

[Steve]

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

 

[f825_633]

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....