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- เผยแพร่เมื่อ 25 มี.ค. 2017
- Dave repairs several faults in a 500MHz HP54161B 2GS/s oscilloscope.
One in particular is quite elusive, can you figure it out before Dave does?
BONUS: Sneak peak at a new Siglent SDS1000X-E Series scope!
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In case you're still wondering about all those "extra" holes in the keyboard PCB (50:00), they're required in order to do the gold plating of the membrane contacts. All of the traces are initially shorted together so that there is electrical continuity during the plating process, after which the holes are drilled in order to isolate the individual tracks.
^^ Needs more upvotes. ^^
@@0x8badf00d agreed, it got mine
instablaster...
TIL
Nothing better than a 1 hour repair vid.......... brilliant.
Glad you liked it.
Yes, quite enjoyable indeed. Whould've laughed my a** off if Dave epoxied that hybrid back together and added a few drops of conductive paint, just because. But eh, not worth it.
Nothing better than a 1 hour repair at 6:20 am! Good morning everyone!
Yeah, what a bobby dazzler!
6months after, and is 6:20 am
4 years later and it's 6:15 am
it is 12am (UTC+8)
28:03 My new ringtone for my phone and I am not even joking.
Ahaha someone beat me to it, I thought I was the only person morbid enough to think about this lol. XD
He sounds like R2D2 does when he gets zapped by something.
The Signal Path Z
th-cam.com/video/GlM6PE2kKVY/w-d-xo.html > Another one found haa haa luv the electric shocks - touchy
I thought you were going to use this 58:45
That feel when you have so many brand new scopes that you showcase three new scopes for no reason while troubleshoting a different, newly bought, scope. You could say that Dave (puts on glasses) is in scope acquisition mode. YEEEEEEAAAAAHH!!
Well played. That actually got a legit LOL from me.
Maybe he's into marketing mode with brymen and siglent stuff..
None of this Agilent rubbish! >Agilent logo on the handle..
i was just about to say
0:05
Scrolled down if someone noticed it... sure enough. :D
Abel Lujan >came here to comment that< >am too late
It's always a good feeling to track a fault down to a physical problem like that. I remember when i was a kid in school and the Pioneer car stereo in my first car crapped out, so I took it apart and traced the fault to a crack in the PCB, repaired the affected traces, and hey presto, working stereo again! I was pretty pleased. PS: full 1080p here no issues.
Glad to see a repair. Don't see them too often. They are the main videos I like to watch. Maybe the scope was dropped - that could be the reason the front panel had a broken piece on it! Good video!
As I've mentioned previously, I studied electrical engineering from 1993-1999, and I haven't touched an oscilloscope since then. That particular model brings back memories of school, and how I absolutely despised my circuits classes. It took almost 20 years and TH-cam to make me like electronics again, but I won't be quitting my day job writing embedded software. Electronics is strictly a fun hobby, not to to be done in school or professionally.
You knew. You showed us everything. How could you do a proper instructional if you just jumped on the problem? You took us on the journey of how this scope is built. Thank You. My eyes have never been more open. You are an awesome teacher. Isn't "dumpster diving" so rewarding? I know this scope was not a dumpster find. It is amazing what people throw away. Oh, well. Good for us! :-)
I will totally try to at least open this hybrid ceramic. It's broken anyway, so maybe heat it up with airgun, look for insides, maybe regular glue + conductive glue can make it sorta work(maybe you can even solder those traces together with solderpaste and reflow). Give it a try, Dave!
Excellent example of how troubleshooting can change your symptoms and thoroughly confuse the repairman. As an electronics technician I have seen more than my share.
Thoroughly enjoyed.
Come on though Dave a little grinding with a Dremel on that ceramic package and I am sure you could get a bodge wire to bridge it over the crack after repairing the substrate with super glue!
Give it a go!
Yeah... I was thinking about a dremel too, it may work..
Thats our Dave - playing a few hours with scopes and signals before considering to trace that crusty PCB. ;-)
Yeah lol - as soon as I saw that cracked lid - the answer was there at the start. But it was worth it for the educational stuff covered from looking at other possible causes. We all learn from mistakes - even other peoples ;)
good shout.
+GadgetUK164 My thought too - fresh-looking mechanical damage outside and a fault ticket usually means mechanical damage inside too.
BTW did anyone else go back to the first clear shot of the cracked PCB and wonder why the lighting/angle was such that you couldn't see the damage? Could Dave have spotted it very early on, decided that would lead to too short a video and so went off around the houses?
Thoroughly enjoyed the whole hour, thanks Dave :)
Thanks.
Dave,
You got me super interested with this repair, old school cpu address lines being used to strobe the controls, very similar to the old keyboard reading method in 8 bit computers.
I thought about the 74LS2XX bus transcevers as well, old school :-D
My new favorite Dave quote: "We're just viewin' the signals for kicks"
This was awesome to watch! Just blown away that the CRT has survived whatever shock went through the unit when it was dropped...
For the crack on the PCB that was not a drop, that seems to be a punch on the rotaries, may be was having a bad day? 😂
Fascinating video. Love these long repair videos. Better than any TV drama!!
Good fun Dave, thanks. I think that you found that fairly quickly. Good detective work. Though it's always an idea to flex or apply pressure to a board in various places with a suitable prodder whilst twiddling unresponsive knobs, or whatever. Some boards you just know will be trouble. Any that get user strain, or those that have heavy components or are flexy....or worst of all a flexy board with a heavy item getting user strain - with crappy solder (all 80s 90s TV sets).
Seeing that purple hybrid gave me cold memories (Those often drift/fail in 3458A DMMs, causing a replacement of ADC board for over a grand USD). No peaking inside cracked hybrid? Could be interesting under Tagano microscope ;)
@19:30 "The transistor is up side down, all electrons are falling down" 😂😂😂😂
Used an HP54161B long ago bought it from the company once they cleared all their hardware. A very nice piece of equipment.
Nice to see a 68000 still in action once in a while.
Good repair, Dave! Cheers!
This was the most exciting hour of video I've seen this week! Seriously, the excitement of finding the crack in the PCB was felt in my home also!
Great demonstration of troubleshooting techniques
Good job Dave! Nothing is better than your repair. That is the best practice for all of us.
I recently aquired an Agilent 54615B 500MHz like this one (only 1GS/s though) and I've got to admit... I love the thing. I use it more than any of the others, lately. It was in much better condition than the one in the video and only needed a little cleaning up. It has the top mounted probe pouch, which still looks brand new, and the scope works like a dream. It doesn't appear to have been used much... none of the usual worn down labels and stuff. I got it so cheap, I'm afraid that if I mentioned the price I'd be arrested for theft. Best price on a new Hantek 50MHz scope, on feeBay, is quite a bit higher.
Great video! I enjoyed watching!
Your repair vids are great. Well paced and i only fell asleep once. Keep up the good work.
The connections that goes to drilled holes is to keep all the golden pads connected during production - this is used when doing the immersion gold.
zaprodk That makes a good deal of sense since they do require uninterrupted electrical connections during the gold plating operation.
amazing how fast it starts up and responds.
Wow, great repair, and the display on that Siglent scope is pretty beautiful for an entry-level model.
winner the circuit board breakage A big bravo for this troubleshooting
This is great. I scored one of these at my college when they cleaned out surplus equipment. It's what got me into electronics.
I noticed that you have your new EEVblog multimeter and looking forward to the review.
Actually the erratic rotary encoders are easier to fix than you think. It happens because they have been sitting for too long unused. Just dial them in each direction 100+ times and you'll see it improve gradually. I got lazy and grabbed the encoder shaft with power tool chuck and it works brilliantly.
I repaired two units in the same 54600 series with broken keypad PCB like a decade before. It happens not because of the manufacturing quality, but somebody who opened up the keypad later (attempting a repair) forgot to slide the PCB under the hooks first before putting the screws on, inevitably bending the PCB until it cracks.
Now I have so many of these units that I just wouldn't bother saving one of those cracked front panel keypads.
Spent many an hour pressing those scope buttons debugging high speed radio modems.. good memories
Repair/troubleshoot vids are my fave.Thumbs up or sure!
Great job, Dave! That was tough unit, especially given all the DIFFERENT things messed up with it.
Try to find more stuff to fix.
Really enjoyed that Dave. Nothing quite like seeing the process from start to successful finish. Would make a great scope for anyone now- even if its left as single channel. Cheers!
I had decided to study semiconductor devices lecture but than I saw this video's notification and then...... a whole hour just passed :D
Thanks Dave, you are such an inspiration for me :D
Thanks, Dave - well, I was wrong, but lesson learned: A methodical approach is best.
First I see him finally repair something, even just half repair. Great video.
Just wanted to say a big thanks for your vids that given me the confidence to fix the EMI caps on the 2467B that I got just as the old Rifa's let go. Not a big deal to you guys probably, but I was chuffed that I managed to fix it. Beauty, as you so rightly say!
I don't care how old it is or who owns it, best no one disrespects a scope . A scope is a sacred object . Fix it Dave!
Great job. I love watching your testing and teardowns.
"Always look out for any dodgy tantalums." - Recently had one tantalum cap explode on me and found another that had split in half some unknown time ago. Both in Williams pinball machine sound boards. Replaced with MLCC but haven't tried thumping them :-)
Watched the whole session! Great job.
Ah.. this scope brings back memories. You can actually activate an easter egg and play tetris on it
Sorry for very late replay, but how u can do it?
This is exactly the kind of content I LOVE to see on your channel! I enjoyed every minute. Thank you, Dave! Please keep on doing this great work.
A late feedback - but thank you for this repair - I am sitting with two of these family scopes with button and rotary issues - I got both really cheap from ebay - intending to repair and this video was really intructive, exposing the rabbit holes... :-) thank you Dave!
Thanks Dave. I've had my share of cracks n jump wire adventures. Congrats on find! Cheers!!
This was AWESOME, thanks Dave!
Great video. Great to see all the effort you went to.
I've been lucky powering it up and if no smoke, running a temperature sensor over the board.. in most cases, it's either cold or too hot. Contact cleaner on the pots really cleans-up the signal, connectors might be next.
I wiggle around all the controls to see if any of the contacts are dirty.
Vacuum it out, pull off the knobs, spray a little bathroom cleaner (foam) on it, wipe it off, and replace the knobs.
This is coming from a technician who has been on the track a long time.
repair videos are my definite favorite. keep it up Dave
Classic EEVblog-stuff! Yay! ^^)
That was a fun one to watch, M'Lad!
Excellent information in this video. Thanks for sharing
Amazing stuff. Thank You Dave
Fantastic video!
That was *_GREAT_* Dave!!! Thank you!!
I love this scope, nice to see you taking it apart so I don't have too. So many bits ;-)
*Vielen Dank* für dieses Video!
Bei Deinen Rep. lerne ich immer wieder neues!!
Exactly the same thing happend to the HP54600B I was transporting in the car. Front panel got a bump in the car and put a hairline fracture in the front panel pcb. A few links later and Bobby Dazzler!
Love these era HP scopes.
Brillant, I want to be able to do this someday, how satisfying to watch
Finally fixed something Dave! Great video😊
I use to work in the lab at LM ericsson, making phone systems a few years back.
When I start working there the lab looks like a cartoon lab with stuff just everywhere...
So I started making identical work stations so everyone could work at the same time.
So I go down in the cellar and looked and there was those HP around everywhere. Was like 20 of them around. I just needed like 6 or 7 of them. Pretty much every single one of them was different. They all looked identical. But was different specs and functionality.
Just my type of video. Excellent!
What a long debug. Glad you finally figured it out.
An enjoyable journey with success at the end. Great stuff. :) You are a legend!
This all seems VERY pedantic. I love it.
really enjoyed that repairathon Dave. :)
Wish I had a scope that nice. Brilliant video!
Old HP54600 series' front keyboard usually crack not from users being rough, but somebody was in the front panel keypad before but didn't know better to slide the board under the retainer but instead they just forced the board above the retainer clips with screws. The repair guy thought they got away with not RTFM and over time the board fractured from the unnecessary stress from the retainer
Bloody relieved that you fixed it, always disappointing when you try everything and you can't get it working, or you Get it partly working. That's not a criticism of yourself, but there's a tension as to if you can fix it or not :)
Really enjoyable repair that Dave! :)
Good one Dave. The repair videos are the best.
Repair videos are the best! Loved it!
Usually when it's a section of buttons/dials not working in a keyboard in general (even a good old computer keyboard that I'm typing this comment on), it's almost always a physical crack/disconnect in the lines. I'm surprised Dave chased it down to the active components before taking the front panel keyboard out for an inspection.
That was a fun show... Nice work..
Fantastic vid! :D Maybe try de-capping the cracked hybrid if it's all the same at this point? Might be interesting. Thanks!
Would have loved to see how you "fixed" the broken lines and strengthen the board. Had similar issue with mine, removed green coating and joined the line with a thin wire but always feel it would break again overtime without putting a real reinforcement on the board... Anyways, awesome content as usual, keep it coming!
we have this model in our local maker space have repared two tines with out some dokumention, first time some r27 has getting larger in the power supply, found the tip in some forum
Great video Dave - thanks. However, would like to see the trace repairs and work on that.
Recently had a 16534a with the same hybrids and reseating them did the trick!
Great work Dave , as a rule for repairing I use a scope probe and push PCBs down with light pressure to see if the symptoms show any sign of dependency . I then hook onto a device that is soldered with the hook and pull board upward gently ..looking for the same . I can't tell you how many times I found stressed solder joints or cracks in board cracks normally suggest impact from my experience. It also is apparent that screws , connectors , chips with pin mounts are all mechanical areas of Faure for older boards especially if they have had some impact. Nice 👍 work
Good video, Dave - Better than the disaster of the Dumpster-Dive TV repair..... lol! Thank you :-)
Absolutely amazing.
Great Video Dave! Learned a lot.
Great video Dave!
That was really interesting. Thanks!
that was awesome. I have an HP 54201D that has a faulty input and now I want to take it apart. I didn't know they had 68000 chips in them!
One of t he best Videos for a while ...Cheers Dave.. Enjoyed it !
Good job Dave.
I like that kind of repair videos. Great job once again ...
Really enjoyed the video! Very nice job.ty
In my experience you can find cracks reasonably easy with one or two layer boards (sometimes up to four layer depending how the middle layers are routed) by holding the board against the sun at an angle. The light traveling through the board will be blocked by the crack, producing a darker line often at an odd angle to the traces.
A lamp that produces reasonably parallel light will work also.
LED light maybe?
Nice video even when I did not understand all the things!
Love video's like this. can't wait for more.
I worked with lots of large hybrids, but I never saw a pogo socket like that: Ours were always PGAs into ZIF sockets. But we weren't pushing GHz signals around.
Nice to see you killed the EEVBlog curse Dave... nice find and nice result, loved the video thanks
It's interesting how often it's left to EEs to track down mechanical problems.