Q on Repairing an HP 332A Distortion Analyzer

Apr 11, 2004 1 Replies

After taking off the back panel [I thought] very carefully, I've discovered that the coax from the front panel switch that selects either Normal [baseband] or RF [Demodulate] input to the [grand]daughter board on the back panel that contains the RF input network was torn loose because there's no service loop in the coax and absolutely no way to free the daughter board from the back panel.



That done, I now want to reconnect the coax to the daughter board with at least some service loop so the problem won't repeat itself. Before I select a repair technique, however, [I think] I need to know the bandwidth of the signal to be carried on this coax. If it's already demodulted and the coax is only there for shielding then a careful splice would do, but if it really carries the RF, then [I think] I need to put in a new coax section with [perhaps] BNC connectors to make it removeable.



I'd appreciate it if anyone with either a manual or knowledge of the unit could provide some guidence as to the proper way to proceed.



Also, if anyone's done this before, how is the back panel supposed to be removed without damaging the connection of the coax to the daughter board.



Thanks Norm



The AM detector input on the 332A goes up to 65 Mhz. The output cable of the RF module carried only the demodulated signal... no RF. It's been many years since I've been inside a model 331A or 332A, but I think you will have to resort to removing all the connectors and mounting hardware for anything that is mounted on the back panel. There are no magic tricks.. everything is hard-wired.

Cheers!!!

-- Dave M

discovered

back

select

coax

really

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