Agilent/Keysight E3634A power supply - circuit diagram needed - Page 1
Forum section: electronics / repair

author: carl_lab
author_rank: Frequent Contributor
timestamp: October 10, 2017, 07:14:43 am
content: I need a circuit diagram of Agilent/Keysight E3634A power supply for repair.Tried to get it from gerrysweeny.com but links were broken...Can anybody help please?

author: Cerebus
author_rank: Super Contributor
timestamp: October 10, 2017, 10:55:09 am
content: The manual part number is E3634-90010 and the April 2000 version of it does have schematics. I've got a copy, but for the life of me I don't know where it came from.Ah, found it:https://gerrysweeney.com/wp-content/plugins/download-attachments/includes/download.php?id=1890

author: HighVoltage
author_rank: Super Contributor
timestamp: October 10, 2017, 11:18:39 am
content: Quote from: Cerebus on October 10, 2017, 10:55:09 amThat link seems to be deadCan you post the pdf, I am also interested to have a copy of this schematics

author: Cerebus
author_rank: Super Contributor
timestamp: October 10, 2017, 11:40:37 am
content: No, can't do as it would exceed the forum upload limits (it's 4Mb, limit is 1Mb).Gerry is on here as gerrysweeney, you could PM him and tell him his site's certificate is buggered and/or ask for an alternative location.

author: carl_lab
author_rank: Frequent Contributor
timestamp: October 10, 2017, 01:27:44 pm
content: Quote from: Cerebus on October 10, 2017, 10:55:09 amSame part number, but Edition 8, November 2014, from Keysight homepage does not include schematics any more.Is that new business policies of Keysight?I send PM to member gerrysweeney.

author: gerrysweeney
author_rank: Regular Contributor
timestamp: October 10, 2017, 01:28:41 pm
content: Have fixed the cert, sorry about thatLetsEncrypt and Cloudflare not playing nice together.

author: carl_lab
author_rank: Frequent Contributor
timestamp: October 10, 2017, 01:34:13 pm
content: Thank you very much, Gerry!

author: Cerebus
author_rank: Super Contributor
timestamp: October 10, 2017, 02:11:00 pm
content: Quote from: carl_lab on October 10, 2017, 01:27:44 pmExactly why I specified the date.As far as I can tell the policy of actively removing schematics happened around 2000/2001, on Agilent's watch. If the manual has Keysight branding it will almost definitely not have schematics. It's a deplorable practice as it makes useful older test gear turn into electronic waste and also removes a very valuable educational source from circulation.The only exceptions are products that were supplied to the military, as returning to the factory is tricky on deployment and service engineers are want to complain if they have to fix things under artillery fire. So the military insist on component level schematics and these tend to turn up as a separate Component Level Information Packet, or CLIP.

author: HighVoltage
author_rank: Super Contributor
timestamp: October 10, 2017, 03:01:58 pm
content: Quote from: Cerebus on October 10, 2017, 02:11:00 pmInteresting info.Do you know an example of a newer Keysight instrument that has the schematics available for the general public because of military usage. I have not seen any schematics for a Keysight branded instrument so far.In addition, I have noticed, it is also more complicated or impossible to order parts for Keysight branded instruments from Keysight.

author: Cerebus
author_rank: Super Contributor
timestamp: October 10, 2017, 04:00:40 pm
content: Quote from: HighVoltage on October 10, 2017, 03:01:58 pmI can't say I have, but as new instruments like the 3446xA replace old discontinued stalwarts like the 34401A (which I know was in use by the UK military) then I expect we'll see some Keysight branded CLIPs appear.

author: HighVoltage
author_rank: Super Contributor
timestamp: October 11, 2017, 06:43:32 am
content: Quote from: Cerebus on October 10, 2017, 04:00:40 pmThat would be nice.But even the latest edition of the 34401A has some changes on the PCB that have not been documented for public viewing and the published schematics from earlier versions are not correct anymore.I also heard from a technician that keysight internal people have no access to component level schematics anymore, since Keysight is not performing component level repair, instead they are only changing boards and so the technicians don't need the detailed schematics.Hmm, not a good development.

author: carl_lab
author_rank: Frequent Contributor
timestamp: October 11, 2017, 10:21:43 am
content: Quote from: HighVoltage on October 11, 2017, 06:43:32 amNext step of that development:Replace technicians by semi-skilled monkeys, because technicians are not needed anymore...