I want to thank everyone who provided helpful comments regarding the
sick HP3561A, both on and off the list. Special thanks also to a
list member who made PDFs of V1 and V2 of the service manual
available. As it turns out, the only fault I have found so far was
fixed before we received the schematics -- a very leaky filter
capacitor in the off-line DC supply. I'm about halfway through a
complete calibration and everything is well within spec so far.
About test equipment quality and reliability: Frankly, I think it is
remarkable that a piece of test gear this complex has survived nearly
30 years needing nothing more than one filter capacitor to meet spec
(yes, I replaced the pair). (I'm anticipating that nothing further
will need adjustment during the remainder of the calibration, which I
think is very likely.)
Thanks again,
Charles
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