HP 1630G Logic Analyzer

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Workshop Project #21 - HP 1630G Logic Analyzer
Originally, I wanted to have a turntable project, complete with portable tube amp ready for this episode, but it turns out that that needs way more than just a clean and new caps after all... so, back to another standby project!
This one is an HP 1630 Logic State Analyzer, model "G". The 1600 series of HP started in the mid 1970s with a rather simple 16-bit visualization device that used a scope tube to show a grid of 0s and 1s. Quite interesting, especially the row of 16 switches to configure the trigger...
...fast forward a few years and we have this model in early 1980s (1983-ish according to a catalog I found online) and we have a monochrome CRT with quite a bunch of ICs that move data around. The "G" model has 65 input channels, eight of which can be either state or timing capture channels; I still have to read up on the timing thingy, haven't tried that one out yet.
The general idea is to visualize correlated logic levels. This enables board level debugging of microcontroller/microprocessor based circuits and is a huge benefit when dealing with these kind of products.
I was lucky enough to find this unit for rather cheap, again, untested. What does it hold in store for us? Let's find out!
UPDATE:
The model for the probe adapter is available here: github.com/Atkelar/OpenSCADGa...
0:00 Intro / Presentation
1:55 Overview / Transport Damage
3:13 Finally: Inside! / Fan
4:20 Boards! Boards! and more Boards!
5:38 Remove: Power Supply / Backplane / Keyboard / CRT Crontroller
6:23 Frame Separation / CRT Removal
7:05 Cleanup / Recapping: PSU Issues / RIFA!
8:20 Electrolytics... sorta / Thermal Paste / Capacitor Footprint Adaptor
10:12 CRT Shrunken Cap? / Thermal Paste / Flux Cleanup!
11:47 Keyboard Cleanup / CRT Cleanup
12:30 Assembly (CRT and Keyboard) / Frame / Rails
13:40 Front Panel / Power Supply (including snapped push rod)
14:22 Fan Assembly / Backplane
15:04 Logic Pods
15:47 Power On!
16:33 CRT Alignment "by ear" / Fixing Push Rod / Self Test
17:29 Menu Demo and Info / Closing up
19:13 Tantalum Replacement / TODOs: Plug / Improvised Wiring
20:18 Demo time! / Storage Issue
21:26 Finished Overview! / Goodbye / Outtake
Music:
My Train's A Comin'
Unicorn Heads
(RU-vid Audio Library)
You can support me on Ko-Fi: ko-fi.com/atkelar

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Опубликовано:

22 июл 2024

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Комментарии : 38

@jamesbennettmusic Год назад

Bipolar caps have become SO much smaller! It's happened to me too, I couldn't get over the difference between old and new. Something must have drastically changed in the technology inside them.

@atkelar Год назад

I kept double and triple checking the values... I just couldn't believe it. But: it works fine. and I had it running for over an hour during the demo recording already. No issue.

@PapasDino 4 месяца назад

Binge watching continues! ;-)

@3dsmaxrocks699 Год назад

Another great restoration! They go thru all the trouble of designing it clean/organized..... and the power switch looked like they forgot about it until the end.

@atkelar Год назад

It sure does look like it, doesn't it? At least it is still a proper switch and well insulated.

@azlandpilotcar4450 Год назад

Great project. Wondering why the "don't care" button on electronic devices was discontinued ...

@kytepheonix 11 месяцев назад

I think this is the first device I've seen with a "don't care" button ...

@christopherwilliams1112 Год назад

The original type of scan coupling capacitor you had to replace with a much smaller one is referred to as "HF Bipolar" and specialist Monitor Parts Suppliers used to stock them! However, Vishay make a range of much larger polypropylene caapacitors sold for Audio and Speaker Crossover use (look in Farnell or Mouser) that are much more suitable for this type of application!

@atkelar Год назад

The main problem I am facing here, is a somewhat limited supply of parts; I can get along with Digikey, but they ship from the US and customs is adding quite a charge. Those speciality caps are sometimes - all in - more expensive per piece than the entire device cost me originally...

@DreitTheDarkDragon 11 месяцев назад

@@atkelar I usually buy components at TME (Poland), it's much smaller shop than Digikey/Mouser/Farnell but only thing I couldn't find were some special chips and sometimes things I'd promise I saw there in past. At least delivery is cheap and fast :)

@senilyDeluxe Год назад

Mine (1651) came without any probes OR pods at all... had to make my own... all passive though. Seems to work though, haven't got a chance to use it yet. Great for troubleshooting ancient computers and arcade machine PCBs. At least it came with the system disks. Without them, it's just a hurricane strength paperweight.

@atkelar Год назад

Interesting! Does the 1651 work with passive pods? I assume this one wouldn't, as the pods contain the comparitors for the logic levels. And yes, these buggers are heavy!

@senilyDeluxe Год назад

@@atkelar It appears so. On the configuration screen the logic levels reflected what was connected to my homebrew probes. But I need to really start using this machine. Btw. does yours have 15kHz or 24kHz screen line frequency? Did I see a TMS9928 or TMS9918 video IC? Would be kinda funny to know a chip that's mostly used in game consoles powers this logic analyzer. (Time code 5:16) The 1651 uses 24kHz (or thereabouts) Med-Res.

@atkelar Год назад

I can't really say right now; it's all buttoned up again, and pulling the main PCB is about 1/3rd the way of disassembly :D - the service manual doesn't list a part number for these chips sadly. Or my scan is too poor to read them in the diagram.

@FoxMccloud42 Год назад

Looks like my HP 54200A Osciloscope. It seams like HP made one chassis, backplane, monitor with controller, psu and frontpanel to "rule them all". Mine has different boards slided in, different sticker on the frontpanel and different printing on the buttons (one button is not populated as I can see in 6:28). That makes it easy to get parts and to repair these things.

@atkelar Год назад

Finally back home here :) - I have realized a similar tactic with several other manufacturers of test equipment: I have four "Precision Instrumetns" devices that share two case designs. And for HP, I have seen iterations by - approximately - every decade or so. I bet it made it more cost effective to produce. I wonder if real collectors sort their devices based on cases or function 🤔

@rfmerrill Год назад

10:39 I ran into a similar situation recapping an old TV. In my case it was extra suspicious because two caps in the same TV were much different sizes despite being the same voltage and capacitance. In that case the best thing to do is buy the one with the highest ripple current rating you can find. It will still likely be smaller, but that's the one remaining spec that you didn't mention. Higher ripple current rating also implies lower ESR most of the time so don't worry about that.

@atkelar Год назад

I didn't have much choice in the ESR selection. The bipolar electrolytics are rare these days, there was only one I could get new with the rating in queston. But so far, so good... And I still find the size difference amusing! 😊

@WooShell Год назад

Nice addition to your workshop, I'm sure 🙂 Fortunately, you seem to have gotten a full set of probe pods, which makes this analyzer really useful. Maybe look into an HP-IB floppy drive next to complete the kit, they do crop up on ebay every now and then. I used to have the same logic analyzer just a few years ago, but the lack of free-running capture, and the weird mix of pods that came with mine (a few state/level, a few timing and a few differential probes, very obviously salvaged from multiple machines), made me give it away again.

@atkelar Год назад

Interesting; depending on the model (A, D or G) it should come with up to three different types of probes from the factory. Are you sure it was a mix? And yes, the missing free run thing is a bit iffy; but I think at worse I can provide *some* clock-like signal from an external source too...

@WooShell Год назад

@@atkelar The probes were in varying states of discoloration and the pod numbers didn't match. Someone tried to make a G model from A and D leftovers.

@numberformat Год назад

I just got this logic analyzer and then came across this video. Thanks for showing how to recap and clean it. I will be doing the same in the next few weeks. Mine came with pods but no manual, probes or software. I have a 3d printer and would appreciate the stl or openscad files. By the way is there a fan page for this device? Where I can get the user manual software or questions answered. If not I can start one as I have pages for other retro things like the xi8088 and related items.

@atkelar Год назад

I am not aware of any specific pages or forums... but a google search got me to scans of the manuals just fine; it is the same one for all of the 1630 models, so maybe look for just that number? The service manual is a bit on the "just so" side though, as HP decided to get a bit sparse with schematics by that time. I'm sure they have most of them in, but they are spread out over dozens of pages per board so it's hard to tell if there's anything missing. As for the probe adapters, I am still fine tuning the 3D model and testing the result. It has rather tight tolerances, so my filament printer wasn't quite up to the task and I had to ask a friend to use a resin based one; but that's just my experience. I'll put out a post and maybe later a shorter update video when I'm confident that everything works!

@atkelar Год назад

I just tested the hopefully final version of the adapter: ru-vid.com/show-UC3ULJK7y0HuIKyMvFIhfeTgcommunity?lb=UgkxtitWzlVyF6C7Kn4RFKXku_Wr3TD2k5_o

@BogTheWombat 5 месяцев назад

Coming late to this video - you have the HP1630G which is State Analysis only - IIRC it gets its extra channels by losing the timebase module so it will not run as a traditional logic analyser.

@atkelar 5 месяцев назад

According to the manual, the only real difference between the others was the number of channels; I think the boards are the same, just more of them. I didn't see any mention of removed functions.

@BogTheWombat 5 месяцев назад

@@atkelar Hi - you are right, serves me right for relying on my failing memory. You have 8 channels of timing. Though to use them you have to select the correct configuration. If you try to select both state and timing channels in the same machine you will just get state. I found getting up to speed with setting the logic analysers up a challenge!

@kytepheonix 11 месяцев назад

On an important note ... what DOES the "Don't Care" button actually do?

@atkelar 11 месяцев назад

It's used to set trigger bits to "either one or zero", i.e. either is fine; as opposed to "trigger when this bit is zero or one" specifically. Oh, and for alphanumeric entry, it's the space key.

@kytepheonix 11 месяцев назад

@@atkelar oh! That actually makes sense, although I'm mildly surprised that HP didn't just label it either/or ... 😂 ... Of course you realize that a "Don't Care" button will be joining an "Any" button and a "Because" button on any device I create ^-^

@francesconicoletti2547 5 месяцев назад

@@kytepheonixback when this logic analyser was new and I being taught digital logic the state diagrams used for logic analysis used labels of True, False and Don’t Care.

@noviceartisan Год назад

I just got a 1630D with the same issue of missing the probe adapters. I noticed you've shared an stl to print one, and I believe it's the same. What is the name/size of the pins that go inside this 3d printed adapter? :)

@atkelar Год назад

Did my reply just disappear? Hmm.. Trying agein: The adapter has some very tiny deges inside, so I advise to do a test-print. The pins I used are "Molex 0008550102"

@noviceartisan Год назад

@@atkelar I think it may have, I don't see another one haha. RU-vid does that an awful lot to me too. I'm using a resin printer with good tolerances, so should be okay i think :D Thank you very much for sharing all this ^_^

@atkelar Год назад

Oh, I forgot; not sure if it's mentioned somewhere, but the bottom part of the case is prepared to get an M3 machine thread cut, so the top can be bolted down directly. If you don't have that, a set of slightly smaller screws and nuts would do too.