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Counting on the HP 5328B

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jrharley:
Appreciate the watching TG! Calamity is certain to crop up!  :D

 I think in the short term, I’m going to work on a cracked, but thankfully not glued knob. It should be a good sidetrack, while I poke and prod the 5328. I find it’s sometimes good for the pondering, to jump to mechanical issues for a different perspective on things.

Speaking of pondering, It’s hard to stomach paying for manuals, but I feel like I need to seriously consider it for this unit. There’s nothing like detailed information. As I talk myself into it, I recall having a local print shop, print and bind an online manual for a scope awhile back and it was at least the cost of the Ebay listings. Getting an original manual does have value.

Thanks for the help! - JRH

jrharley:
HP 5328B update here – So I’ve been poking around with the incomplete info I have, seeing what I can see. The 5328B version, seems to have incorporated as standard, what was on the A version, an option. The A14 Multiplier board is installed on this guy, but not listed as an option on the back of the unit. The schematic for this board is not in the manual I have, but I’ve been prodding about anyway. There are 2 trimmer caps, 10 to 60pF range at the top of the board. One of those guys seems to be a dead short. The plates on the cap don’t look to be aging very well. I may take it out for a closer look while I wait on better schematics. Both the +5V and the +15V rail are present at the card socket as indicated from the markings on the board.

Meanwhile, I’ve been working on stabilizing a cracked level knob on the B channel. Dialing in on it has taught me a good bit more about these knobs. A couple pics of the journey attached. - JRH

Tony_G:
Nice work to stop further degradation - If I ever end up at the point of needing to replace one of mine (on whatever piece of gear it is, don't have a 5328B), I'm planning on creating a 3D model and seeing if I can print a reasonable facsimile. Will stick that up on the HPAK group.

TonyG

jrharley:
Appreciate it Tony_G!

5328A update:

We are counting now!....well, …..sorta’.
Channel A & B aren’t doing s@%!, but channel C is looking good for this stage of the journey. It’s counting across the range up to about 800 MHz with a 250mV signal, which is where I stopped. No worries here. Is it in calibration?.......not a chance, but it’s accurate and stable to about 4 digits. I’ll take it for now. Things seem to be converging on channel A as the place to pay attention to, but this is saying that the oscillator is working fine, along with the 1.3 GHz board. I now have decent technical information specific to this unit. That means I’ll be crawling into a hole to study this stuff. Replaced 3 RIFA caps in the meantime. Yeah, they were all cracked, still measured good. Onward! - JRH

jrharley:
Happy Weekend fellow TE addicts!
The new manual information is a great help. There's a ton more information in it than anything else I've seen. All of it is very specific to this unit and in general, they did a nice job with the reproduction.

I’m zeroing in on the “synchronizer assembly”, board A10 to begin with. Working on breaking the thing back open to remove the A10 board. It’s not too bad a job, but you can’t just yank the board out. The faceplate’s gotta’ come off to remove it.

A couple random progress photos attached. - JRH

Having trouble with the pics, not sure why :-//

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