Yokogawa 2558 AC Voltage standard Service Manual? - Page 1
Forum section: electronics / general

author: Zermalmer
author_rank: Regular Contributor
timestamp: November 10, 2017, 07:07:51 pm
content: Hi,I search for the service manual of the 2558Looks like it is also a kind of the lost manuals

author: dl1640
author_rank: Regular Contributor
timestamp: November 14, 2017, 04:36:36 pm
content: what is wrong with your 2558?

author: Zermalmer
author_rank: Regular Contributor
timestamp: November 14, 2017, 05:20:31 pm
content: Hi,I wanted to check the adjustment procedure, because the device slowly drifting out of specification.I think I have to adjust it next year.Also the 100mV and 1V range are unstable or they where without function. (Can't actually remember).In this case the not working ranges are not a problem, because the user of the device didn't need them.But if I go for an adjustment I also want to check if I can fix this two ranges.add:and the red LED for the state of the output is flickering/stop to light from time to time while switching rotary switch.Best regardsAndreas

author: dl1640
author_rank: Regular Contributor
timestamp: November 16, 2017, 10:47:44 am
content: instability may caused by relays in output section, please try to clean or replace them

author: Zermalmer
author_rank: Regular Contributor
timestamp: November 16, 2017, 04:28:27 pm
content: Thanks.Schematics (if they are in the SM) naturally would make it a little bit easier to search and identify locations in the device.

author: dl1640
author_rank: Regular Contributor
timestamp: November 17, 2017, 06:50:17 am
content: first of first, do proper cleaning and carry out voltage inspection per attached

author: Zermalmer
author_rank: Regular Contributor
timestamp: November 17, 2017, 11:48:44 pm
content: Thanks for your help...Difficult for me to take action on the devices, because they are only used partly and have to be returned close in time back to productionToday I had a 2nd 2558 on desk and there also the 100mV run out of spec. (but here not needed in production enviroment)All other ACV are within spec... also ACI are in good condition.Only have to check the 400Hz ACI on hi amps again, because frequency stable reference leaved for calibrationBut I have more to come... so (if other work allows it) I maybe will have the chance to get at least one of them full functinal within spec and then get the others piece by piece fully back... but it will take time.You know... managment decisions... "is it needed with all the effort or does partly calibration is ok in this case?" and you know the answer if they request needed time to get them full up.

author: dl1640
author_rank: Regular Contributor
timestamp: November 18, 2017, 10:07:29 am
content: we dont worry about out of spec, we worry about unstable outputthis monster is 1980 product it is difficult to get components for replacement, maybei have the manual but i am sorry it cant be disclosed to you 100%if you have specific requirement in the future, let me know, i will help to look up some info for youcheers

author: Zermalmer
author_rank: Regular Contributor
timestamp: November 18, 2017, 06:51:51 pm
content: Thanks for the offer.Will get in touch with you if I have further questions.

author: giovannirat
author_rank: Regular Contributor
timestamp: April 15, 2020, 11:49:27 am
content: Still looking for a service manual for YEW (Yokogawa) 2558 AC.Especially the part with the adjustment procedures would be helpful....Thanks.

author: dl1640
author_rank: Regular Contributor
timestamp: April 21, 2020, 02:55:36 pm
content: :)Now use 2558A, closed case adjustment .

author: TiN
author_rank: Super Contributor
timestamp: April 22, 2020, 11:00:33 pm
content: Yokogawa 2558 manuals and some others made it toFTP repositoryThanks to contributor

author: surachoke
author_rank: Newbie
timestamp: April 23, 2024, 12:20:47 pm
content: Quote from: dl1640 on November 16, 2017, 10:47:44 amHi,I have the issue with 2558 old model. At some certain range, the display will be blinking and output is turn offed.As you mentioned that the relay in the output section may need to be cleaned or replaced.There are two visible relays on the board (big one and smaller one). Do these relays on the output section?