Tektronix TDS 520 - Page 1
Forum section: electronics / repair

author: Franz
author_rank: Contributor
timestamp: February 12, 2016, 02:25:24 am
content: HelloI've got a problem with the tektronix TDS 520it seems that he has forgotten the calligraphic tion data.start going to watch, so there selbstet Verhart the unit .can awarscheinlich the self test durchfüren not.Can someone help me there .Thanks in advance.FranzModify message

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 03:05:04 am
content: Maybe you are with a memory problem, that non-volatile memory, when the battery inside it ends, that happens.I think it's name is NVramVielleicht sind Sie mit einem Speicher Problem, dass nicht-flüchtigen Speicher, wenn die Batterie in ihm endet, das passiert

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 03:09:28 am
content: there may be problems with capacitors also electrolytic SMD capacitors.es kann mit Kondensatoren auch Elektrolytkondensatoren SMD Probleme

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 03:17:28 am
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: Franz
author_rank: Contributor
timestamp: February 12, 2016, 03:22:00 am
content: Quote from: SAUL BRITTO on February 12, 2016, 03:09:28 amthank you .the electrolytic capacitors I have all renewed .and the bort cleaned.should not be so mind.you can create the store remedy .if you an external storage battery instaliert? but why you would need to know the assignment.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 03:26:23 am
content: Quote from: Franz on February 12, 2016, 03:22:00 amWell Franz the tek TDS line do have as your main defect this kind of event

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 03:27:28 am
content: You don't see a Nvram on your main board? It's manufacturer is DALLAS.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 03:33:44 am
content: Can you post an image of your screen at the self test time?

author: Franz
author_rank: Contributor
timestamp: February 12, 2016, 04:20:28 am
content: I have the dallas DS1245Y-120 strikespicture I have to link, only I do not know howSo I just need to DS1245Y-120 , NONVOLTILE SRAM 1M, 128Kx8 CMOS DIP 32pin PLASTICnew get and paste?I can also use?M48Z128-120PM1 1 Mbit (128Kb x8)I can DALLAS DS1245Y-120 get that should be no proplem.as written above, it remains in this state as the top of the picture.but I understand your not text entirely.on the dallas're the calibration data is not it?which are still laying on the other memory chip with the software.Or have I got that wrong ?

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 04:26:15 am
content: Quote from: Franz on February 12, 2016, 04:20:28 amYou can use a site like this:http://pt-br.tinypic.com/store your images in there and paste your link here

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 05:00:22 am
content: Yes, I see that you have a Dallas memory unit and generally is the responsible for this defect,it is a non-volatile memory,all your settings are inside it after poweroff,if it fail...I just don't know exactly how to replace that unit,this envolves things like calibration,but if your scope memory dont works well with calibration there's not problem.I think you just will have a bit of work with the post memory replacement,because tektronix scopes are not like the HP line that, has auto calibration.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 05:09:38 am
content: But I think you have to post an image where the self test shows what pass or fail.I mean self test result.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 11:04:55 am
content: Quote from: Franz on February 12, 2016, 04:20:28 amSorry if I did not understand well your text it's because is in two idioms.If your scope stops loading at that point, See all your PS voltages,ripple,search for cracked welds,bad contacts on the CI pins.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 11:13:19 am
content: some people tend to push the CI with your finger with the scope "on" to check whether they are properly connected "of coarse" don't touch on the pins.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 11:30:34 am
content: Look the ribbon cables for bad contacts too

author: Franz
author_rank: Contributor
timestamp: February 12, 2016, 12:33:41 pm
content: Thank you. I'll check the CI pins.

author: Franz
author_rank: Contributor
timestamp: February 12, 2016, 03:57:57 pm
content: which are all ok cable.but what is noticed when the clock appears I have the top left corner in a kürser who when he is not there the self-test taken.if he goes is not there.I again measured and everything looked.when I disconnect the central connection.and ozi Create then the clock goes away but the remains black screen ..therefore it must be there somewhere.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 08:25:07 pm
content: Hi Franz. Have you a schematic diagram for this scope? Are you really shure about the PS Voltages? There are some default signals that your scope generates like a clock and another signals,it's present "I think" on this ribbon cable of the image.Get your schematic. There are tons on the internet.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 09:05:39 pm
content: Franz please write in german because as I "think" you are using some kind of translator and,it isn't working well for us.Maybe direct of german to portuguese (My language) We can do it better.Let's try.

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 10:57:26 pm
content: Look at this Franz:https://www.eevblog.com/forum/repair/tek-tds7404-repair-attempt/

author: nctnico
author_rank: Super Contributor
timestamp: February 12, 2016, 11:11:37 pm
content: Look for the 'TDS520B component level service manual'. It has a detailed diagnostic section. Also don't be afraid to post in German; lots of people can understand it and it is better than using a translator!

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 12, 2016, 11:51:10 pm
content: Franz read the manual, thats is the right way to begin.Franz lesen Sie das Handbuch, das ist der richtige Weg zu beginnen

author: Franz
author_rank: Contributor
timestamp: February 12, 2016, 11:52:24 pm
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 13, 2016, 01:19:20 am
content: Quote from: Franz on February 12, 2016, 11:52:24 pmAber Sie werden verstehen

author: Franz
author_rank: Contributor
timestamp: February 13, 2016, 08:20:18 pm
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: nctnico
author_rank: Super Contributor
timestamp: February 13, 2016, 08:28:23 pm
content: You have to replace the SMD electrolytic capacitors and wash the boards with alcohol. The FAIL errors the oscilloscope shows are the signs of bad capacitors!

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 13, 2016, 08:32:44 pm
content: Quote from: nctnico on February 13, 2016, 08:28:23 pmHe said that was made, all you are written. The fail on the selftest is on the aquisition board,but can be really caps.

author: Franz
author_rank: Contributor
timestamp: February 13, 2016, 10:36:29 pm
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: February 14, 2016, 12:36:54 am
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: Franz
author_rank: Contributor
timestamp: February 14, 2016, 11:25:57 am
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: nctnico
author_rank: Super Contributor
timestamp: February 14, 2016, 12:00:09 pm
content: Quote from: SAUL BRITTO on February 13, 2016, 08:32:44 pmIn that case there may be broken PCB traces or vias (eaten away by the electrolyte) or some capacitors where not replaced. Some of the capacitors are used in analogue circuitry as well; those circuits depend on the relatively high ESR of the capacitors. The FAIL errors for the acquisition are clear indicators that something is wrong with the acquisition board and the capacitors are the most likely cause. There is a lot of information on this kind of repair if you search for 'TDS544A fixing'. In the TDS544A oscillscope I have fixed I had to resolder several chips in areas badly affected by electrolyte to get it working properly.

author: Franz
author_rank: Contributor
timestamp: February 14, 2016, 12:24:18 pm
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: Franz
author_rank: Contributor
timestamp: March 13, 2016, 03:01:05 pm
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:

author: SAUL BRITTO
author_rank: Frequent Contributor
timestamp: March 13, 2016, 06:27:48 pm
content: Look at your Power supply for ripple,maybe any voltage regulator is in bad condiction too.

author: Earendil
author_rank: Regular Contributor
timestamp: March 13, 2016, 10:04:15 pm
content: I don't think German discussion is very useful for most of the people here.I'm too lazy use a translator for all of the posts here. And secondly: most people search in English. So useful information won't be found if it's in German or any other foreign language.Couldn't you at least add Google translation for the German posts? So non-German speakers at least can decide if it's interesting to them or not.

author: Simon
author_rank: Unknown
timestamp: March 14, 2016, 06:45:28 am
content: This is an english speaking forum. It's not fair on the wider audience if everyone uses their own language and I have no idea what is being written in any language that is not English or Italian so it's not appropriate from a moderation point of view.

author: xwarp
author_rank: Frequent Contributor
timestamp: March 18, 2016, 09:45:34 pm
content: Quote from: Simon on March 14, 2016, 06:45:28 amI personally don't have a problem with other languages being used as long as another member who is responding in that language at least paraphrases the dialog.I for one clicked on this thread because I have an older TDS series scope that had the leaky cap issue on the acquisition board. Since replacing them all, everything has been fine so far.

author: Simon
author_rank: Unknown
timestamp: March 19, 2016, 11:35:51 am
content: I'm not too bothered if a translation is supplied after the english version but a forum full of different languages just does not work. I know not everyone has a good level of english and they are not expected to but if two people want to exchange advice in their own language for ease of one of them we need it in english as well.