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HP 4957A Protocol Analyzer - No power, what to check?
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EricJRW:
Hi all. New here.

A Internet search on the subject led me here.

Does this unit have a fuse? It's not obvious to me. Plug in and switch to ON, and still nothing. Not even a hum.

I'm sure it was working last time I used it, probably over 5 years ago. :-)

Was cleaning a closet and came across it. Wanted to remember the good old days of debugging RS-232. Anyone remember TNPP (Telocator Network Paging Protocol)?

Any help appreciated.

Thank you in advance,
Eric
gslick:
I just tried this on my 4957A. It took a little more force than I expected to flip out the top of the fuse cover. The cover pivots out from the top while the bottom end stays attached.

EricJRW:
Thank you!

Well the fuse is OK.

Is there something else I can check?

Eric
TheSteve:
TNPP is before my time in paging - did you work in the industry?
EricJRW:

--- Quote from: TheSteve on May 12, 2019, 05:27:23 am ---TNPP is before my time in paging - did you work in the industry?

--- End quote ---
Yes, I did. Motorola, back when the pager was the communication device everyone had, or wanted, as cell phones where way to expensive. :-)

Prior r to the FLEX paging protocol, most links were RS-232 (even the consoles), or lease line. Internet was still in its infancy.

When Mot shuttered paging, I moved onto cellular base stations. Now, even that has ended.

It's a shame.

You said "before my time in paging." Are you (were you) in it?
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