No.068 - Agilent E3631A Power Supply Repair & Restoration - Part 1
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- Опубліковано 22 гру 2020
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In this video series I attempt repair of an Agilent E3631A Linear PSU.
Here is part 2:-
• No.069 - Agilent E3631...
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Wow, that certainly meets the definition of a "face plant". I really expected it to work after the front panel replacement. It must have failed first and then was damaged in storage/shipment. This should be another excellent series of power supply repair videos! Thank you, David.
The PSU was packed really well. The unit reflected the photos of the unit prior to shipping. There is a sticker on the enclosure "powers on, cannot control output".....LOL!
Great video as always. I highly recommend you check the opto couplers on the main regulator board as well. Mine had two of them dead plus the opamp that you just replaced (OPA27) and also one or two of the resistors around the ADC were also open. So it seems those components are dodgy in this series
I was surprised the display survived the front panel damage.
Me too!
Japanese VFDs are wolves engine ...
This is definately more involved that a loose wire or blown fuse.
Wish I had a lot more like this!
Good job troubleshooting.
Hummm.... A box of mysteries! Interesting. Merry Christmas, Ian!
Fantastic part 1 =D
This one seems like a fun one, GL!
Excellent vid Ian. Thanks... Happy Christmas to you ......
Yay another repair :-)
On The 3647 there was also a supervisor IC which messed with the 5V rail causing it to not sense the voltage, not sure if that is the same architecture.
Great, you really seem to get the interesting ones lately!
The HCNR200 opto couplers are a suspect from me, I had issues with those on a 3647A
The analogue signals are reaching the multiplexer IC just fine. The ADC isn't working, the integrator is doing nothing.
Funnily enough, my own home made PSU from years back used the same analogue opto-couplers I think (terrible things, their tempco is BAD), so I have loads of them.
Been buying from Puerto Rico then, I hear they have some equipment "removed from a working installation" for sale, only one owner, might have been dropped once.
Who knows what their history is!
Great Video.I have a question about green matt on desk .it is very clear .What is using or cleaning .mine is very dirty and alchol and cleanng materials not enought for cleaning
I just use IPA.
Its an ESD matt.
Ian Scott Johnston ... I envy you for your FLUKEs ...
Hi Ian,I amlong time fan ,would you share your duel psu schematics and code from the upgrade you did to convert to two big lcd displays I would love to update mine as the display is very weak and on it's way out ,I was hoping to put lcd displays and a digital voltage and current keypad on but not sure where to start would love a peek at the code you wrote buy any help would be appreciated, thank you for the great content, best wishes
open relay circuit? initial reaction. does it have such a module? Now i'm sucked in... lol
I guess you're still evaluating the Envox BB3?
I need a cover case. Please tell me where to buy it?
Big caps in parrallel of outputs? Is it normal for lab PSU? What about fast current limiting?
I have one of those in "to be fixed" condition. Binding posts are shot..
Whomever "dropped that one from a great height" should be "dropped from a great height" for damaging that PSU. Looks like you got on with it though :)
07:21 check that you have actually soldered the rightmost capacitor to the roghtmost banana post ;-)
Nice repair! Thank for sharing. Is it possible you add subtitles option to be activated for next videos. It will be helpfull for me!!!
Well, I can experiment with them and see how they behave with the Scottish accent.....:)
@@IanScottJohnston Thank
@@jean-claude836 I've added for the previous four videos, but it won't let me add for this video......I will try again in a few days.
7:30 should these caps even be there?
My friend , never ever go into CAL mode unless all circuitry is functional 100% and you need for CALibration to get accuracy , otherwise , keep away from any CAL modes on any TMI ... Also , from my long experience , I rarely got faulty OP-AMPs so please recheck those faulty parts you have thrown away , might be working !!...
I respectfully disagree, page 66 of the service manual states that you can terminate any cal setup without changing its calibration constants by turning off power.....which is what I did. My observation in there was to attempt to see if there was any corruption and no more.
Since 1984 when I first got attached to the EE workbench I have had plenty of faulty op-amps.....:-)
Did you get it from Israel ? stuff from there is always smashed or corroded.
This one did, as did my Stanford Research SR650.....I like the smashed up stuff.
Heh... I was starting to type exactly the same question. I guess it's "that one seller" that everybody seems to know about...