No.077 - Agilent E3633A Power Supply Repair
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- Опубликовано: 19 окт 2024
- In this video I repair an Agilent E3633A Linear Power Supply. Multiple faults & problems made for an interesting repair.
Here's the finished power supply:
www.ianjohnsto...
Display board firmware (80C51):
www.ianjohnsto...
Note: If you buy the AT89S51-24JU then it can be programmed with the MiniPro TL866A
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Ian, I can't tell you how much I appreciate these videos. Thank you.
Wow, excellent repair! Lucky that MCU was readable (and not protected!!) - incredible job =D
I searched high and low online for the firmware for the E3633A but couldn't find it.....so yep I was lucky!
Maybe post it on your website for others?
@@rlgrlg-oh6cc It's in the video description above, and also my website now.
Ian, as per previous comment, I CAN tell you how much I appreciate these videos, they are Superb, and give me a huge ammount of pleasure, keep htem coming :-)
Wow! This was very interesting repair. Luckily, You can read that damaged MCU.. 👍
Multiple times in repairs, I get in situations, when MCU were shorted and readouts wasn't possible.. Second situation when read out fails, is when manufacturers put protection (usually, on newer MCU's).
Great repair video, enjoyed it! 😉
Excellent job there. Very interesting. When I saw that socket for the microcontroller I thought to myself "that thing is big, wonder if it will fit". Just made it!
Yep, it was going in no matter what.....:-)
Very cool. I bought a 120V DC 10 Amp HP PSU on eBay which looked to be in good condition and powered up. The seller shipped it so poorly the unit arrived with the entire front panel smashed off. Thankfully the seller gave me full refund and apologized for their "mistake". I now have to evaluate whether the thing is reparable and hopefully the PCB,LCD, keypad, etc aren't irreparably damaged.
Dang, talk about going the extra mile in a repair. Very inspirational, keep up the amazing work!
Thanks!.......If you want to see the extra-extra mile see my Keithley 2001 DMM repair, 6 videos!
Amazing patience and skill. Great work.
First class Ian. Superb.
Top drawer Ian top drawer ! Great technique and explanations.
I also have an E3633A and this video might be helpful in the future.
Thank you for the excellent video.
Please keep them coming.
OK, color me impressed!
Nice repair, Good job!
Nice repair.
I love these repairs! Keep 'em coming!
That is a HUGE transformer! XD
The power supply weighs 9kg (20lbs) approx.
Wow! it was as usual incredible instructive. Ian, thank you for sharing your knowledge and your experience. ;-)
Nice Video and great courage to even attempt to safe a unit this broken :D
Just a hint btw... don't connect a big dc bus to the thing before discharging it, that tends to end in tears. Don't ask me how i know :P
Nice, well done. Enjoyed the repair. Cheers
Nice fix....cheers.
Here's the finished power supply:
www.ianjohnston.com/images/stories/IanJ/E3633A/E3633ApsuRepair.png
Notes:
Why did I use a 32K 89C51RC2........well, the 4K 89S51 which is the natural replacement is on backorder 2022 delivery with RS, Farnell & Digikey.....ugghh!
Note: If you buy the AT89S51-24JU then it can be programmed with the MiniPro TL866A
That power supply looks like new in the photo, of course it would with a new front, but you would never think it had been repaired. We know otherwise of course, but if we hadn't known we would be none the wiser! :-))
Nice work.
Truly outstanding repair! But, closure man! Show the new front panel going on, all nice and tidy, looking new again, etc. Would of finished off the video nicely ;) Well done, awesome work.
There's a photo in the video notes above.
@@IanScottJohnston So there is. Nice 👍
Well done!
Brilliant repair sir, well done :-))
When pulling off old tape or labels, use a heat gun to lightly heat the tape/label before pulling it off. In my experience, often the adhesive will "come to life" a little and separate from the mounting surface leaving less "stuff" behind. Of course, use heat sparingly depending on what the surface material is (plastic, etc.)--you don't want to melt it!
Good advice!....In this case IPA made quick work of the tape adhesive but yup, thats not always the case.
fab repair
Amazing skills!
good job!
I need to fix the encoder in my E3631A
Interesting repair! :)
Do you know if the display board firmware is the same for all that series of supply or is it custom for each model ?
I think it's fairly common to have one of those IC fail and then there is nothing you can do without the firmware ...
That did cross my mind, and I compared the firmware for the E3633A and the E3646A and they appear the same. I don't have any display firmware for any others so not entirely sure.
Hi Ian, Excellent job on that psu. Had me on the edge of my seat. Do you think you could do a video on the reading and reprogramming of microprocessors proms etc. in depth if poss. This is a skill I sadly don't possess yet. Cheers, Gillian.
Glad you enjoyed the repair.......
Nice idea about programming proms etc......I could probably do something around the address/data buses and how they work, and it's quite interesting how old Eproms are programmed (50mS pulses etc).
@@IanScottJohnston Thank you Ian :) A “from the start” would be of most interest to me. I’m amazed tbh that they are not all protected. I suppose I assumed that they were. Atb, G.
@32:00 that symptom was exactly the same as one I had on a unit I fixed, it was due to the microcontroller being dead, I had to replace it.
I reckon the controller had some SCR latch up and the resulting semiconductors turned into a resistor
Can't believe it came to life!! Would you sell me these colored rings of the connectors? 🙃🙃
wow! fantastic job replacing that micro. Never seen a micro "working" and yet having a near short inside. What is the programmer that you are using?
It's Dataman S4, I did a restoration job on it here,
ruclips.net/video/qJi7C7huhHQ/видео.html
@@IanScottJohnston Ah, a face to the voice :-))
Your videos are always great, thank you! I have a E3633A that fails the OCP calibration. I have replaced all the electrolytic capacitors, but that didn't help. OCP works within spec. In fact, all the verification tests are within spec. Can you give me some insight as to how the E3633A calibrates the OCP? I have looked around, but could not find anything. Thank you.
Great repair. Again. Why did you leave the other RIFAs in?
I've never had a problem with the smaller RIFA's, so just left them fitted. I should really buy some compatible caps I guess.
Did you replace the 78L05 as well? I wouldn't depend on it after what happened.
The overload was within spec for the 5v regulator and thats why it was able to maintain 5Vdc output. If it had been pulled down from 5Vdc then I'd have replaced it.
It's the resistors that were way beyond their power rating.
@@IanScottJohnston Surprised that you didn't measure the voltage across the 14 Ohm resistors at around 32:00, this would have revealed the current. It's a great diagnostic (as I'm sure you know) to know the current in situations like this.
Ian, do you know if there are any EPROM devices similar to the S4 on Aliexpress? S4 is on a professional level, almost 4 grand. I wonder if the plethora of cheaper devices on Aliexpress would be able to do that.
The TL866II Plus might do the job if you also get a DIP to 44pin PLCC adaptor.
I have the older version (non Plus) so I might make a wee video to try it out.
Great fix! I have 3 of these exact supplies at work, where did you get the schematic?
The set of schematics and board layouts are at the back of the Service Manual which you can find dotted around the web.
@@IanScottJohnston Hey thanks. Another way to TS intermittent issues, is heat and freeze spray, I always use heat first (with a thin piece of cardboard to direct/section off areas), I think the solder issue and the mpu issue could of been found this way. If heat does not give me clues, then I try the freeze spray. Thanks again.
👍👍👍 !
Looks like the transformer is quite noisy on high current output. The result of the drop?
To be expected given the loads and since the covers weren't fitted. I'll see when I test it again with the covers on. The transformer is a brute of a thing, I reckon it can handle a drop or two, but it is possible the eddy currents are distrurbed!
@@IanScottJohnston I am surprised the transformer didn't break loose and cause a lot of damage!
So was it a proper metric spanner ? Nice video.
You know, you get them with metric on one side and imperial on the other, so it fits both types of bolts and nuts :-P lol ;-))
@@BoB4jjjjs So do you use the left metric right imperial or the special order that I prefer being left handed the imperial left metric right handed ones.
The cap came out of the socket :-)
I guess it did...:-)
@@IanScottJohnston ruclips.net/video/N-Huh-ok2aU/видео.html
Hey thanks for the video. I'm about to tear into an E3634a and this was a great intro to what lies ahead. One question, why did you only replace the X2 RIFA cap? Why not the two smaller 1000pf across each side to ground? I believe these are Y2 so they never go short and shock anyone who grabs the case.
Yes, they should have been changed out......but generally, they don't fail as much as the bigger ones in my experience.
Great thanks for the quick reply!
How about a Agilent 6611C, ? Id pay to see that. I have one driving me insane and no schematic to be found. No output.
I did repair one here albeit an easy fault.
ruclips.net/video/0YNwTAyRcJU/видео.html
@@IanScottJohnston Any ideas where to find a schematic or buy a digital PCB so I could narrow it down? Love your videos, i'm a big fan!
@@TheSoundtec Does this help? www.manualslib.com/manual/2871/Agilent-Technologies-6611c.html?page=54#manual
@@BoB4jjjjs Thanks but not much there. More like a block diagram. I know the prob . is on the A2 board and no information in that manual.. Thanks for trying.
Please share the microcontroller code somewhere for the next person that needs it, it might be me LOL.
I will, just had to make sure the extracted data from the 80C51 wasn't corrupt......thankfully it wasn't.
@@IanScottJohnston Actually, email it to me please Ian, I will add it to my files, it is possible I will get one of those one day.
@@TheDefpom I've added a link to it in the video description above.
@@IanScottJohnston thanks... I have now added it to my files.
It really must've been dropped from a great height to have the front damaged that badly.
......or pushed! Chances are high the department in question just fancied some new power supplies. 2nd one from this seller I have bought all smashed up.
My guess would be "chucked in the skip" , obviously by someone who didn't know what they had.
Knackered
My E3633A passes the complete self-test with no error. However, when I turn the output on, the unit goes in to "Unreg" unregulated. Neither CC or CV are lit. The voltage and current are not adjustable and only -0.3V output.
Does anyone know the problem?
This can happen when the PSU can't somehow regulate the correct voltage in CV mode. It can be experienced if say when charging a large battery and eventually the battery voltage over-volts the output from the PSU, the PSU recognizes that and you get UNREG displayed.
But as you aren't connecting any load then it sounds like there's a fault in the circuit somewhere........but it could be anywhere and so would require an investigation of the analogue and digital circuits......much like I did in this video.
@@IanScottJohnston thank you
Is that that infamous Israeli seller?
Yep it is. Thats the 2nd or 3rd Agilent PSU I've had from them. The other ones were just as broken!
And to think I mocked that configuration. Clearly the Solartron peoples were genuis's's's.
Alcohol displaces water
Is that why I dry out when I drink too much? I don't drink at all these days, well, maybe a pint if out for a meal, but that has not happened for a while now. Thanks Covid :-((
Yeah, me n the ball & chain were out for an Italian last weekend first time in 18months!
@@IanScottJohnston I hope it was a nice meal :-))