hybridfree/eevblog-posts huggingface dataset:
Looking for PTC Thermistor part# - Page 1
Forum section: electronics / repair

author: bnetz
author_rank: Newbie
timestamp: September 05, 2024, 01:40:47 am
content: Hey Everyone,i have a board that needs a New smd thermistor. it only has a 7 on it

author: MathWizard
author_rank: Super Contributor
timestamp: September 07, 2024, 11:03:08 pm
content: IDK much about SMD labels, maybe a 7kohm ? Or some factory code I guess.What was it from, do you know what the circuits around it are ? From that it might not be hard to guess a range, and then just try some resistors or potentiometer. But yeah what material would it be, and what should temperature coeff. be, IDK but if you're lucky, it's just some typical off-the-shelf PTC.So yeah I'd want to know about the local circuit it's in.
Looking for Rohde&Schwarz ZVRL HDD image - Page 1
Forum section: electronics / repair

author: nico0481
author_rank: Newbie
timestamp: May 28, 2019, 11:38:40 am
content: Hello,I've have a ZVRL and the HDD seems to have a problem.Device doesn't boot (stay on boot screen), no error returned, but HDD make some creepy noise...Does anyone have a disk image for Rohde&Schwarz ZVRL to share?Thank youBest regardsNico

author: mrf245
author_rank: Regular Contributor
timestamp: May 29, 2019, 03:18:32 pm
content: HelloI have ZVR with WinNT, firmware is newest. I don't know if this can run in ZRVL.
Looking for R&S HM7042 Service manual - Page 1
Forum section: electronics / repair

author: Decee1
author_rank: Regular Contributor
timestamp: April 11, 2021, 12:32:16 pm
content: Hello,I'm looking for a service manual/schematics for HM7042. Searched a bit on Google and found a ton of Russian sketchy sites which isn't legit.Got some overshoot issue on the device i'm trying to repair, pretty known for those to get overshoot issues after a long time of service(+20 years)Pulled out most of the caps on the AC-DC board and checked them on LCR meter only to see them being within spec.I found the HM7042-5 schematic but they have done some major changes on it since then so much of the circuit is different.Hopefully somebody can share it.
Looking for SAE Mark VI tuner repair help - Page 1
Forum section: electronics / repair

author: MarkoGVA
author_rank: Contributor
timestamp: February 24, 2023, 10:33:27 am
content: Hi guys,I have a very nice vintage SAE Mark VI tuner from 1970's with the oscilloscope and nixie tubes.The tuner section works fine, but the oscilloscope trace is very weak.It seems to be responding correctly, but the image is "washed out" and can not almost be seen.I live in Geneva, Switzerland.Anyone who could take a look at this with a view to repair it?Thanks and regards,Marko

author: TomKatt
author_rank: Frequent Contributor
timestamp: February 24, 2023, 12:52:34 pm
content: Most likely some kind of power supply issue (old capacitors etc), although the CRT tubes do have finite lifespans and if it has decades of hours on it it is possible the tube requires replacement. But my money's on a power issue.If you go poking around, do be aware that even small CRTS can have potentials of several kilovolts at various points - use extreme caution if you don't know what you're doing.Edit - I am exceedingly jealous of that tunerJust beautiful !
Looking for Sanyo STK070 datasheet - Page 1
Forum section: electronics / repair

author: Lacibácsi
author_rank: Contributor
timestamp: March 27, 2023, 05:35:49 pm
content: Hello everyone!I would appreciate if somebody could point me to the original Sanyo STK070 datasheet, it must have been contained in the Sanyo-Semiconductors Databook, Audio-Use Thick Film Hybrid Integrated Circuits volume.Thanks and have a nice day.

author: fzabkar
author_rank: Super Contributor
timestamp: March 27, 2023, 05:43:58 pm
content: STK070 or STK0070?There is something on page 15 (STK0070):http://www.kontest.ru/datasheet/unkn0wn/stk403070.pdfIt would appear that STK0080 and STK0100 are higher power versions.Here is a datasheet for STK070 and STK050:http://www.yaspro.com/attachment.php?id_attachment=1496https://pdf.dzsc.com/STK/STK050.pdfNTE1336 is listed as an equivalent for both the STK050 and STK070:https://www.datasheetarchive.com/?q=nte1336... as is the ECG1336:https://shop.griederbauteile.ch/info/n/NTE/nte1-207.pdfhttps://pdf.datasheet.live/5cc1916b4d5a6d7cab75c421a10f1220.pdf

author: Lacibácsi
author_rank: Contributor
timestamp: March 28, 2023, 03:39:25 pm
content: Thank You for the response.Unfortunately, these are not the originals (what I'm looking for) and have only very limited information (mostly the pinout).I'm looking for diagrams, recommended circuits etc.I think, the 0070 has 70W max. output power, while the 070 has only 20W.

author: floobydust
author_rank: Super Contributor
timestamp: March 28, 2023, 05:45:37 pm
content: I have this and in the mid-80's Sanyo went to Mark II series like STK0070II revision with triple-EF. My app notes are for the Mark II Series which use STK 3040 or STK 3042 driver.People have made discrete replacements for the STK's as well.
Looking for Schematic for "Divided By 13" Amplifier JRT 9/15 - Page 1
Forum section: electronics / repair

author: alsetalokin4017
author_rank: Super Contributor
timestamp: May 17, 2018, 10:19:52 pm
content: Lining up to try to repair this fine-looking guitar amp and looking for a schematic. Any help would be much appreciated. Amplifier apparently doesn't put out full volume, according to customer.http://www.dividedby13.com/jrt915.html

author: alsetalokin4017
author_rank: Super Contributor
timestamp: May 19, 2018, 04:01:39 am
content: Never mind, I fixed it!Now that I have it open I can see that it is dead simple in design and built like a tank. I could sketch the schematic in ten minutes but no need at this point.Symptom: very very weak volume output, somewhat distortedPrior work done by customer: preamp and power amp tubes swapped with known good, no effect on problemProcedure: Check filament and plate voltages with Fluke 87-III DMM. inject sine wave signal at input jack, trace with trusty Rigol DS1054 scope.Result: Voltages good, plate voltage supply at a bit over 300 V. Injected signal goes wonky after volume controls and at intermediate ECC83S/12AX7, looks like a diode-clipped half-sine.Interpretation: Half of the 12AX7 is dead, receiving no plate voltage.Action: check resistors in plate supply with DMM. Shoe enuf.... 220k series resistor to dead side's plate is open. Unsolder, check to confirm: open.Repair: replace resistor and test: WOW, what a beaut! Full volume restored, distortion gone!Although the bad resistor wasn't burned or had any evident external damage, and was probably simply a manufacturing defect, I still suggest preventative maintenance: Replace series resistors on both plates with higher wattage units.Note that I really didn't need the scope for this repair. Simply checking plate voltages at the tube sockets with DMM revealed the lack of voltage on the plate, even though the supply was good upstream, and from there it's a single step to check the resistor.

author: finom1
author_rank: Regular Contributor
timestamp: August 20, 2022, 10:25:57 am
content: Hello, do you have a schematic for Divided By 13 amp? The link does not work. Thank ou!
Samsung SM-G955U cellphone over voltage repair help - Page 1
Forum section: electronics / repair

author: poot36
author_rank: Frequent Contributor
timestamp: November 06, 2021, 04:34:15 am
content: I can find the schematics for the SM-G995F and for the SM-G950F but not for the SM-G955U which has a different board layout around the data and power connector on the main board. I am trying to repair an over voltage that was sent into the phone through the charging jack by a defective charger (it got around 36V in the USB C port). I have already replaced the IC labeled U804 in the SM-G995F schematic and now I have some voltages on the main PCB around the power management IC but it will not charge the battery or turn on. The IC mentioned in the SM-G995F schematic is KTS1678EUQ-TR and the exact part I got from Mouser was this KTS1678BEUQ-TR. Not sure if this is the correct part or not as I do not have the exact schematic to match my phone. Is there some things/voltages I can check to see if another part needs replacing?

author: fzabkar
author_rank: Super Contributor
timestamp: November 07, 2021, 08:12:36 pm
content: They're only product briefs, but it would appear that the "B" version may just be a newer part with better specs.https://www.mouser.com/datasheet/2/936/KTS1678-03m_Datasheet_Brief-1489359.pdfhttps://www.kinet-ic.com/uploads/KTS1678B-04d_Datasheet_Brief.pdf

author: poot36
author_rank: Frequent Contributor
timestamp: November 08, 2021, 03:08:34 am
content: I am just not sure that the part is even correct as the iFixit disassembly(Link:https://www.ifixit.com/Teardown/Samsung+Galaxy+S8++Teardown/87086) indicates that it may be this part: FPF3688UCX which I can not find at any major online parts sources. Not sure what the differences may be.

author: fzabkar
author_rank: Super Contributor
timestamp: November 08, 2021, 06:37:20 pm
content: They could be compatible parts. Manufacturers often use second sources.
Looking for schematics for lab power supply Terco TF101 - Page 1
Forum section: electronics / repair

author: MrElectric
author_rank: Contributor
timestamp: December 23, 2021, 08:39:45 pm
content: I'm looking for schematics/manual for my lab power supply Terco TF101. It's from the end of the 60's or beginning or 70's.Unfortunately I don't have the manual, and there are two burned resistors that would need to be replaced.Does anyone have this power supply?

author: rpiloverbd
author_rank: Regular Contributor
timestamp: December 25, 2021, 01:54:26 pm
content: Hello, are the resistors burnt beyond recognition? I mean, can't the colour bands be seen? Thank you.

author: MrElectric
author_rank: Contributor
timestamp: December 26, 2021, 10:11:07 am
content: Yes.. There are color bands on them, but not really recognizable. Also, I have measured the resistance of both, and they don't have the same values (though I think they should). So I guess the resistance has changed when they were over heated.

author: MrElectric
author_rank: Contributor
timestamp: December 28, 2021, 09:55:11 pm
content: I assume the colors changed due to the heat.But, if that is indeed white, white, brown, that would mean 990 ohms. I measured both resistors, to 247 ohms and 461 ohms respectively.Both should be the same, as the board is otherwise mirrored (I think for + and - voltage).I have been thinking of drawing up a schematic for it, but that would be a lot of work. Both the PCB itself (comparing the trace on the underside with the components on the top side), and all cables leading to the transformer, power transistors, etc.. But I might still do that, eventually.
[solved]schematic of "Invask Invasion SG15R" or "Epiphone Studio 15R" guitar amp - Page 1
Forum section: electronics / repair

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 17, 2023, 10:35:07 pm
content: This is the guitar amp:This Epiphone Studio 15R front layout looks very close, just mic input and level pot is missing, may be same PCB (?) :I searched both in google but couldn't find schematics.The SG15R contains a 2-spring reverb tank and a handful of JRC4558 OP amps.

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 23, 2023, 09:12:07 am
content: Does anyone know which guitar or amp forum I could ask for?

author: donlisms
author_rank: Frequent Contributor
timestamp: November 23, 2023, 04:54:15 pm
content: Doesn't anyone reverse-engineer anymore? Goodness gracious - how did anyone ever fix anything before google?I will say this - when you invest the effort to draw a schematic, you end up with a pretty solid understanding of how the thing works!Curious... Why do you need the schematic? Is broken?

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 24, 2023, 09:44:35 pm
content: Quote from: donlisms on November 23, 2023, 04:54:15 pmNo question I could reverse engineer the amp, if I invest about one workday. But why should I re-invent the wheel, anyone has done before in the best case?Quote from: donlisms on November 23, 2023, 04:54:15 pmIt's not broken. The amp just sounds not as bad as I expected for such a cheap practice amp. In fact it sounds quite decent...So I wanted to know what's inside the blackbox.

author: nanodocl
author_rank: Contributor
timestamp: November 25, 2023, 11:54:41 am
content: Try to contact the manufacturer directly, sometimes they share!

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 26, 2023, 11:51:15 am
content: Quote from: nanodocl on November 25, 2023, 11:54:41 amI asked manufacturer first but got no reply.Sorry forgot to mention...PS: Yesterday I received theEpiphone Studio 15Rschematics from Gibson Customer Service.After checking I can confirm the PCB is identical to the wantedInvask Invasion SG15Ras I supposed, the Gibson/Epiphone is just missing one JRC4558 double OP amp and MIC-Level pot and input jack for MIC.

author: Greybeard
author_rank: Frequent Contributor
timestamp: September 09, 2024, 12:37:21 am
content: Someone asked me for the schematics:
Looking for  SCR   BTW68-1200R    **Stud Mount**  Please - Page 1
Forum section: electronics / repair

author: JoeyG
author_rank: Regular Contributor
timestamp: May 30, 2021, 10:22:13 am
content: I'm looking to replace a **Stud Mount** BTW68-1200R..Googling found a ST SCR Datasheet however they are TOP3 flatpack - 30A, 1200V, Igt 50mAQuestionHas anyone seen a Stud Mount version of the BTW68-1200R datasheet or what happen to themI found this one exstock a Element14https://www.newark.com/pdfs/datasheets/SSI/07R9709.pdfbut has 100mA IgtAny comments appreciate

author: Alex_Baker
author_rank: Frequent Contributor
timestamp: May 30, 2021, 12:53:19 pm
content: I have a 22RIA120 that I pulled off of something years ago, its only 22 amps though. I thought I was onto something when I found it in my bin.

author: Alex_Baker
author_rank: Frequent Contributor
timestamp: May 31, 2021, 12:45:32 am
content: I found a bunch of stud mount SCRs available on mouser.com, just search for SCRs and filter by stud mount. They start at around $15.

author: james_s
author_rank: Super Contributor
timestamp: May 31, 2021, 12:53:24 am
content: I've bought big SCRs like that on ebay in the past, didn't pay much for them. If you can find something with reasonably similar ratings it should work.

author: factory
author_rank: Super Contributor
timestamp: May 31, 2021, 07:17:19 pm
content: Is that part code correct?, a generic databook I have from 1970 has a stud mount BTX68 series from Mullard (aka Philips) but only in ratings of 500V to 1000V.David
Looking for Service Manual for Anritsu MG3700A Vector Signal Generator - Page 1
Forum section: electronics / repair

author: Hugoneus
author_rank: Frequent Contributor
timestamp: July 29, 2021, 07:18:37 pm
content: If anyone has this, I would very much appreciate it. Planning to make a video and this would make it a lot easier.

author: Doper
author_rank: Newbie
timestamp: September 11, 2025, 11:42:34 am
content: Hello Shahriar,I have finally managed to get an MG3700A, works great. I have not got any manuals now.But I want the 6GHz option, how did you find that device ?Do you still have it ?Did you manage to fix it ?Thank you !
Looking for service manual Iwatsu TS-8500 scope - Page 1
Forum section: electronics / repair

author: RahmanID
author_rank: Contributor
timestamp: October 29, 2024, 06:50:47 am
content: Hello, I have searching on the internet about service manual for Iwatsu TS-8500 but nothing found.Anyone here owned the service manual Iwatsu TS-8500?

author: aeg
author_rank: Regular Contributor
timestamp: November 25, 2024, 12:53:27 am
content: I have the user manual, but not the service manual. I would be interested in the service manual also.
Looking for Service Manual or User Manual Leader LPS-2801 DC Power Supply - Page 1
Forum section: electronics / repair

author: RahmanID
author_rank: Contributor
timestamp: October 11, 2024, 03:05:16 pm
content: Hello, I'm new hereI have a Leader LPS-2801 DC Power Supply but not working properly - I have search on internet to find service manual or user manual but not found anything.So, I ask here maybe someone have itImage for the power supply in attachment.

author: Bryn
author_rank: Regular Contributor
timestamp: October 11, 2024, 03:20:47 pm
content: I did a quick search myself, and I can confirm that there are no manuals for it available online. You might want to contact Leader themselves about it...

author: RahmanID
author_rank: Contributor
timestamp: October 11, 2024, 03:28:17 pm
content: Quote from: Bryn on October 11, 2024, 03:20:47 pmSadly hear itbut Thanks for your help.12 hours ago I have contact Leader company but no response at all (or maybe need more time, who know) - let's see in 2 - 3 days.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: October 14, 2024, 01:35:43 am
content: Maybe it has some similarities to the LPS -151https://www.manualslib.com/manual/3347493/Leader-Lps-151.html
Looking for some Tektronix TDS3000 parts - Page 1
Forum section: electronics / repair

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: August 16, 2018, 01:02:44 pm
content: Hi,Can anybody help? Does anybody have any spare Tektronix TDS3000 series case parts?I am looking for the cover for the communication module slot:And the two parts that retain the handle, I need two sets, one for each side:These are parts 2, 5 and 6 in this view:Thanks!!Regards,Jay_Diddy_B

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 13, 2020, 04:38:34 pm
content: Hi,Reviving an old topic.I solved this problem at the time by buying parts from Tektronix:Item 6Item 5And this fixed that scope.3D Printing solutionI have another scope that requires the same parts. I recently bought a 3D printer and I have been learning how to use Fusion 360. I thought it would be a nice project to build replacement parts.Original ComponentsThe hub is the most complicated part:Here are the printed parts:I will also have to make this metal part:Installed on the scopeIt took a couple of goes at each part to dial in the dimensions.I am quite impressed with the results from the 3D printer.Regards,Jay_Diddy_B

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: May 13, 2020, 06:42:15 pm
content: Would you be willing to share the files for the 3D printing of those parts?

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 13, 2020, 09:17:58 pm
content: Hi,I presume that you want the .STL files?The cover was printed outside downThe indent part was printed with the indents up.The hub part was printed with the small end down. I used FlashPrint and let it add supports (tree) automatically.I used PLA.These are close tolerance parts. I had to open some of the holes with a twist drill afterwards.I did get them to work nicely.Regards,Jay_Diddy_B

author: texaspyro
author_rank: Super Contributor
timestamp: May 14, 2020, 02:27:47 am
content: There is a topic on the forum for posting 3D printed test equipment parts. That would be the best place to post the files.

author: tpowell1830
author_rank: Frequent Contributor
timestamp: May 14, 2020, 07:20:54 am
content: Thanks for sharing this. i would be interested in the 3d files so that I can modify and tweak.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 14, 2020, 03:12:45 pm
content: Quote from: tpowell1830 on May 14, 2020, 07:20:54 amHi,Here you are:I have about three days experience with Fusion 360 so please bear this in mind.Please share any improvements.Regards,Jay_Diddy_Btektronix TDS3K Handle.zip(668.57 kB - downloaded 98 times.)

author: lowimpedance
author_rank: Super Contributor
timestamp: July 31, 2025, 04:05:51 am
content: Made a quick 3D model for a basic cover to fit the empty 3000 rear communication slot.STL over here..https://www.eevblog.com/forum/testgear/replacement-knobs-feet-and-fittings-for-test-equipment/325/
Looking for someone in AU to repair a Fluke Networks DSP4300 - Page 1
Forum section: electronics / repair

author: Dtrain
author_rank: Newbie
timestamp: May 21, 2023, 12:56:40 pm
content: Looking for someone in Australia who can repair a dead Fluke Networks DSP4300 cable analyzer set ?

author: abdulbadii
author_rank: Frequent Contributor
timestamp: May 22, 2023, 01:57:44 am
content: isn't this place for help repair so just clarify, illustrate the problems?
delete - Page 1
Forum section: electronics / repair

author: xavstar
author_rank: Newbie
timestamp: November 12, 2021, 03:52:43 am
content: .....

author: AnalogueLove1867
author_rank: Regular Contributor
timestamp: November 12, 2021, 07:00:31 am
content: Completely depends on the actual details. Loonix is free for a reason.

author: m3vuv
author_rank: Super Contributor
timestamp: November 12, 2021, 04:07:59 pm
content: post some pics of the damage,we dont all have xtal balls !.
Looking for TDK-Lambda SWS-600-5 schematic and service manual - Page 1
Forum section: electronics / repair

author: JohnG
author_rank: Frequent Contributor
timestamp: November 30, 2019, 05:54:53 pm
content: Hi folks,I'm looking for schematic and service manual for a TDK-Lambda SWS-600-5 AC/DC power supply, or anything of the same series. Any info appreciated. I have the instruction manual, but want to dig a little deeper into the design.Thanks,John

author: marcelo.digital
author_rank: Newbie
timestamp: March 31, 2021, 03:39:55 am
content: Olá, saberia me indicar onde fazer downloads de esquemas eletrônicos ou fóruns que trate a respeito dessas fontes de alta complexidade e alto custo, principalmente TDK lambda ? Estou me especializando nelas aqui no Brasil e a demanda é grande. Obrigado, Abraços

author: FlyingHacker
author_rank: Frequent Contributor
timestamp: March 31, 2021, 04:47:14 am
content: I have one for a Lambda EWS600. However, I had to sign an NDA to get it. So I can't legally share it.However, you should be able to contact Lambda tech support and get the one you need. They were extremely helpful to me.This is their email address, though you might have to initiate the request via their website.Lambda.TechSupport@us.tdk-lambda.com

author: coppercone2
author_rank: Super Contributor
timestamp: March 31, 2021, 05:35:31 am
content: haha NDA on thatok if you wanna circumvent a NDA, the thing you do is thisget a fine bushy brass brush, get a long ferrule and a thick gauge wireInsert the wire into one end of the ferrule and a bunch of brass bristles in the other end. Insert the ones you cut off the brush (the cut section) downwards (they are really sharp and you wanna hide them inside of the crimp), crimp it. Solder a banana jack to the other end of the wire. you can also cut a whole bunch of strands of brass wire if you want, this is just easier to use a brush. Its fairly stiff and works much better then trying to use the copper in a wire to make some kinda sweepNow you have a measuring broom that you can sweep a PCB with. The only other secret is you wanna clean the board really good so it makes fast contacts. This makes pin mapping much easier on repair, something most people need nowadays because the idiots got missile guidance systems and boring industrial back end bull shit confusedso if you don't have schematics for boring industrial BS, its so much more tempting to buy 4x chiense ones and swap em in because you don't wanna deal with calling lambda lol

author: FlyingHacker
author_rank: Frequent Contributor
timestamp: March 31, 2021, 06:55:35 am
content: Yeah, I don't get the point of an NDA on the schematic. It's not like any Tom, Dick, or Harry can't get it from them. So what's the purpose?Anyway, Lambda makes some very nice kit, and they gave me the schematic for mine right away.So why buy Chinese trash? I'd rather buy the good stuff that rarely fails anyway.

author: vishaldotgupta
author_rank: Regular Contributor
timestamp: June 17, 2024, 06:25:07 pm
content: hiif you have the schematic for SWS 600, can you please share it with meneed to fix mine as well
Looking For TDS 794D EEPROM Image - Page 1
Forum section: electronics / repair

author: EE54
author_rank: Regular Contributor
timestamp: January 03, 2024, 04:24:16 pm
content: To put it bluntly, I messed up.While trying to modify the content of the NVRAM to enable options, I accidentally overwrite the EEPROM content. I believe it holds the cal constant.Now on boot up, it shows, FAIL ++ PROCESSOR.checking the EEPROM content with a hex editor shows all zeros.Anyone have an EEPROM Image available? Or am I screwed and need to recal the scope.

author: m k
author_rank: Super Contributor
timestamp: January 09, 2024, 08:18:29 am
content: If it's cal it's your cal, no alternatives.Somewhere is also a serial number.

author: TERRA Operative
author_rank: Super Contributor
timestamp: January 09, 2024, 02:03:26 pm
content: I posted also on Tekscopes, but I'll mirror it here for others to reference.If you actually damaged the contents of the cal EEPROM you will need to completely recalibrate the unit.Ithinkif this happened you would likely get a calibration error on boot (working from memory...), so there might be hope yet for your scope.I would try reflashing the firmware and NVRAM first to see if the scope comes alive.Recalibrating is not for the faint of heart, acquiring all the needed equipment and running through the calibration process is quite the ordeal...Here's the ROM dumps attached below from my TDS794D, they are verified to work on my unit (I copied them into new NVRAM chips recently)Also, you can find other versions of the firmware files here at Tekwiki if needed:https://w140.com/tekwiki/wiki/TDS794D

author: EE54
author_rank: Regular Contributor
timestamp: January 10, 2024, 03:04:21 pm
content: I double checked and even compare my EEPROM content to that of a good TDS 694C.I 100% nuked the content of the EEPROM holding the cal data. Unfortunate but it is what it is.Well thanks everyone for your help anyway, especially Jared.I'll probably take a month for me to gather all the needed equipment for cal.See you all then.Nick

author: TERRA Operative
author_rank: Super Contributor
timestamp: January 10, 2024, 04:09:31 pm
content: Good luck!Feel free to ask more questions, I've done a cal or two and it's..... fun....Retro computers with ISA slots, leveled sinewave generator (a bit over 1GHz @ 5.5V peak to peak... ) and precision DC sources (You only need to go to +/-9.5V regardless of what the manuals say BTW) etc etc.If you need a National Instruments ISA GPIB card PM me.This is a good video on the basic process:
Looking for technician to repair Logitech z906 around Leeds - Page 1
Forum section: electronics / repair

author: psyniax
author_rank: Newbie
timestamp: May 12, 2024, 07:45:55 pm
content: Hello. Problem with speakers is poping sound same as from linkLDO was repalced and this helped for about 2 hours. Later problem came back.Looking for someone who can carry repair in Leeds or surroundings.Thanks

author: MathWizard
author_rank: Super Contributor
timestamp: May 23, 2024, 06:51:29 pm
content: I rebuilt my Logitech x-540, there's not much to it, I think the z906 is a bit more advanced. Do you have any tools like a DMM or soldering iron, or knowledge of electronics ?If I remember right, Leeds is a fairly big city, you could probably go down to a university, and find some EE students that would look at it for fun, probably for free, or for a 'pint down at the pub'.

author: Audiorepair
author_rank: Frequent Contributor
timestamp: May 23, 2024, 07:06:28 pm
content: There's a whole world of difference between EE students who can derive Schrödingers Equation from first principles, and someone who can repair broken stuff.Good luck with that, but they'll probably enjoy the pints.

author: Smokey
author_rank: Super Contributor
timestamp: May 23, 2024, 07:43:40 pm
content: New = $395https://www.amazon.com/Logitech-Surround-Sound-Speaker-System/dp/B004M18O60Used "Volume Pod" = $89.99https://www.ebay.com/itm/305575097545I can't think of many consumer electronics type things that it would be worth to have someone else fix.

author: KevinA
author_rank: Regular Contributor
timestamp: May 23, 2024, 10:24:08 pm
content: Years ago, my company were advertising for a tech to repair music electronics, guitar amplifiers, effects pedals etc.One guy applying was a full blown PhD in electronics. When I met him, I said that he was way overqualified for what we were offering, but he was adamant that he needed a job, there was no work.Ok, I said, and took a 10W guitar amplifier from the repair rack, handing him the amplifier and the service manual. My telephone suddenly started working overtime, and so he was left alone for about 30 minutes. When I finally spoke to him, he said he was totally confused, he could get no gain out of the first stage operational amplifier, and showed me four pages of intense algebra analysing the stage.What is the supply voltage on pin 8 I asked. He turned red as he measured zero volts; a shorted bridge rectifier had blown the supply fuse.Kevin

author: Audiorepair
author_rank: Frequent Contributor
timestamp: May 24, 2024, 11:09:18 am
content: Smokey is correct, repairing this kind of stuff Commercially is unviable.I certainly won't touch it, despite learning how to derive Schrodingers Equation from first principles.
Looking for the best  ATARI 2600 repair forum. - Page 1
Forum section: electronics / repair

author: JoeyG
author_rank: Regular Contributor
timestamp: June 03, 2025, 02:13:46 pm
content: Looking for the best ATARI 2600 repair forum.ATARI 2600 Rev 14/15I'm looking for waveform signal voltages going in to pin 4 of the RF modulator.IE PAL composite signals I think, but I'm unsure if the RF modulator is expecting PAL voltage levels.Do these voltage levels look right?https://en.wikipedia.org/wiki/PAL#/media/File:Composite_Video.svghttps://upload.wikimedia.org/wikipedia/commons/a/a8/PAL_2_lines.pngATARI2600 Service Manual is herehttps://wiki.console5.com/tw/images/e/ec/2600_Field_Service_Manual.pdfSchematic is 2nd last page

author: coromonadalix
author_rank: Super Contributor
timestamp: June 03, 2025, 02:29:50 pm
content: should have searched there ....https://atari-forum.com/
Looking for the New Tektronix SMPS Green Hybrid 100004 PC Boards - Page 1
Forum section: electronics / repair

author: Smoky
author_rank: Frequent Contributor
timestamp: August 27, 2021, 09:00:26 pm
content: Hey guys, I revisited a topic on Groups.io and I didn't realize that someone designed and printed new boards for the 10004 green hybrid used in the SMPS's of TDS400 series oscilloscopes.If the genius was from EEVblog, is there any on-hand stock of these

author: shakalnokturn
author_rank: Super Contributor
timestamp: August 27, 2021, 09:26:23 pm
content: Although it came together as team work in the end, I like to think I was the person who really got it started.I went to the bother of buying two used Tek PSU's that I didn't even need at the time just for the sake of reverse engineering the thing.Many hours spent...As for spare PCB's ISTR someone mentioned having some here or on the LeCroy group about a year back.I must still have my original layout somewhere if you want to try a DIY PCB, it's a single sided design with 0Ω SMD's where jumpers are required.

author: BROOKSCIRCUIT
author_rank: Newbie
timestamp: April 28, 2022, 07:01:22 pm
content: I would love to get the layout/schematic of this. I'll make more for sure!

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 28, 2022, 08:24:33 pm
content: Someone on EEVblog offered to sell or give me some PCB's, can't remember who it was now.I wasn't in need when the offer was made but if anyone in Europe is going to place an order for some I could do with a couple now.

author: BROOKSCIRCUIT
author_rank: Newbie
timestamp: May 03, 2022, 04:17:43 pm
content: Would you mind shooting me your notes/layout? I would like to compare to what I had found. I have just about everything spec'd, but there are a few gray areas.

author: elremont
author_rank: Newbie
timestamp: December 05, 2022, 01:23:39 pm
content: Hello guyscan anyone share this pcb???

author: elremont
author_rank: Newbie
timestamp: February 04, 2024, 09:46:21 pm
content: Or maybe someone has a scheme for a green hybrid?i want to revive my tektronix.

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 04, 2024, 10:12:46 pm
content: It's all on groups.io...I've since had a few PCB's made as no one was around to offer when I needed them.I'm not really into selling but not against a little return on time on time investment either.Interested in an assembled and tested module?
Looking for the service manual of an obscure Carver receiver (model 6250) - Page 1
Forum section: electronics / repair

author: cvanc
author_rank: Frequent Contributor
timestamp: May 03, 2019, 12:41:25 pm
content: I've looked in all the usual and several unusual places and have not come up with a schematic or manual for this model. Anyone know where one might be found? Thanks.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 03, 2019, 02:25:59 pm
content: To my knowledge there`s no leaked schematics for carver productsIn the past (1988), i had an formation at carver warehouse how to dismantle some very complicated ``cube`` amplifiers, and they were very secretive for the tubes amplifiersgood luck

author: cvanc
author_rank: Frequent Contributor
timestamp: May 07, 2019, 12:07:26 pm
content: For anyone else looking for this manual, I found it at this web site. I had to sign up and pay a reasonable fee for the download. Transaction went smoothly.https://www.analogalley.com/index.htm

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2019, 02:25:11 pm
content: oh thks something i learn, bookmarked itHope its complete for you

author: cvanc
author_rank: Frequent Contributor
timestamp: May 07, 2019, 03:38:00 pm
content: The manual I got seems complete - it has the specific stuff I was looking for, anyway.Just so you know, the vast majority of Carver service manualsareavailable free on the Web; there are many sites with large numbers of them for download. This particular model was a rarity in that the manual was not to be found at the usual places.
Looking for this chip 32db 9KHZ-1GHZ (SONOMA 310) - Page 1
Forum section: electronics / repair

author: teatime
author_rank: Contributor
timestamp: September 14, 2024, 08:08:50 am
content: Right now the LNA found output low, the power supply is 15V.The RF chip suspect defective.15V via 220ohm provide the working voltage to this RF chip.The gain it 32db between 9khz to 1GHZ, the gain flatness is +/- 1.5dbBut the model is erased by the factory.Would you help me to find the right model of this RF chip.Thanks

author: Manolo Mos
author_rank: Contributor
timestamp: September 14, 2024, 04:04:52 pm
content: I think there is an error in the schema, output is input and vice versa.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 14, 2024, 04:11:55 pm
content: MAR-3 MAR-6 MAR-8 amplifiers ....the 32db gain would tend to be this : MAR-8SM+https://www.mouser.ca/datasheet/2/1030/MAR_8ASM_2b-1699752.pdfBut the supply voltage

author: teatime
author_rank: Contributor
timestamp: September 15, 2024, 07:45:34 am
content: I know MAR-8, but the gain only 25db at 1GHZ.Thanks anyway.

author: teatime
author_rank: Contributor
timestamp: September 15, 2024, 07:46:45 am
content: You are right, it's my fault, the symbol is incorrect of the amplifier.
Looking for this GaASFET - Page 1
Forum section: electronics / repair

author: teatime
author_rank: Contributor
timestamp: December 18, 2024, 01:33:43 am
content: The GaASFET marked "182", but it's not the actual model.I have attached the schematic and some photos.The working voltage of this GaASFET is about +13.5v, gate is a negetive voltage.Frenquency band is 1GHZ - 3GHZMaybe some person can identify the manufacturer via the outline.Thank you very much!

author: fzabkar
author_rank: Super Contributor
timestamp: December 18, 2024, 02:50:59 am
content: The markings and package style look similar to these:https://i.ebayimg.com/images/g/WsIAAOSwZZpdSnRh/s-l1600.webp(Fujitsu FLL190)https://ae-pic-a1.aliexpress-media.com/kf/S11c066cfb8534887877e2f93ef17da60F.jpg(FLL105)https://vdusr.tkcdn.com/p-13455930-20221118012836/fll120-fll120mk-l-band-medium-high-power-gaas-fet-1-piece.jpg(Eudyna FLL120)https://www.sedi.co.jp/pdf/FLL120MK.pdf

author: teatime
author_rank: Contributor
timestamp: December 18, 2024, 03:25:18 am
content: Thank you very much.Your reply is very useful!

author: eb4fbz
author_rank: Regular Contributor
timestamp: December 24, 2024, 11:46:10 am
content: Could be a NEC part from the same family as NES1823P-30Next time, please avoid asking the same question on two different sections of the forum.
Looking for this RF FET - Page 1
Forum section: electronics / repair

author: teatime
author_rank: Contributor
timestamp: July 06, 2025, 02:07:51 am
content: Hello, everyone,I'm try to repair the BONN amplifer,but the RF FET marker is not real,I mean "TRA0135" or "TRA0132"is customization model, so I can't buy the RF FET from internet,I think maybe someone can recognize the original model.So I have removed the ceramic top cap, then use microscope observe and take the photo.I'm expect someone can tell me the real model.Thank you very much!

author: Swake
author_rank: Frequent Contributor
timestamp: July 06, 2025, 07:19:09 pm
content: Searched for the logo on the FET but could not find a manufacturer with a similar logo. Do you have any idea what company it might be?

author: teatime
author_rank: Contributor
timestamp: July 07, 2025, 12:46:15 am
content: Maybe this RF FET made from CREE, but I'm not sure.

author: picburner
author_rank: Frequent Contributor
timestamp: July 07, 2025, 04:31:59 am
content: It would seemthis.

author: teatime
author_rank: Contributor
timestamp: July 07, 2025, 10:06:32 am
content: Thank you.I know this web, I live in China, the product of this web is not 100% reliable.Even some store is fake inventory.
Looking for Voltcraft/Hantek DSO 1062d root-fs image - Page 1
Forum section: electronics / repair

author: forslund
author_rank: Newbie
timestamp: June 24, 2025, 03:33:44 pm
content: Hi,I have a Voltcraft DSO 1062d that no longer starts. I tried the recovery but it didn't help at all. After some googling I foundhttps://marcowuen.wordpress.com/2013/09/01/dso-hacking-quick-guide-voltcraft-dso3062c-hantek-dso5062b-tekway-dst1062b/#fixcrashguiding me to install a serial terminal. However my oscilloscope gets a kernel panic error when booting normally so my issue is a bit more troublesome than the article describes. When the recovery screen is shown I do get a working serial terminal and can muck about a bit.I get the following error when running the recovery script manually from the serial terminal:Code:tar: bunzip error -5tar: short readSo my issue seems to be that the /recover/rootfs/rootfs.tar.bz file is corrupt. Is there anyone with a DSO 1062d oscilloscope that have a backup image or a serial terminal installed and can get help me get a copy of this file?Or any other tips on how to get my oscilloscope back into working order.Thanks/Åke
Looking to connect - Page 1
Forum section: electronics / repair

author: marc.hickling
author_rank: Contributor
timestamp: January 07, 2021, 01:07:16 pm
content: Hi my names Marc Hickling and Im the lab manager at enaelectronics in Hamilton, Ontario, Canada. (www.enaelectronics.ca) For a while now I've been looking to connect with other people in the industrial repair field. I feel there's massive benefit in some shared resource and help on troubleshooting and repairing old and obsolete equipment. Wondered if anyone on here is in the same field. If so PM me or message below - it'd be great to connect
Looking to purchase Fluke 6080A Front panel assembly - Page 1
Forum section: electronics / repair

author: rfdes
author_rank: Regular Contributor
timestamp: October 22, 2022, 09:09:57 pm
content: If anyone has one for sale please PM me to discuss.ThanksSorry -I tried to remove this post but wasn't allowed. I've reposted this in the Buy/Sell section.
Looks a bit like a diode, but what component is this? - Page 1
Forum section: electronics / repair

author: erikbrenn
author_rank: Regular Contributor
timestamp: October 07, 2023, 10:57:28 pm
content: I'm trying to repair my Bosch drill and have opened the switch unit. Can anyone tell me what kind of component this is (the orange one in the top)?Using my DMM in ohm mode it measures open circuit. Also, diode mode does not yield anything.

author: fzabkar
author_rank: Super Contributor
timestamp: October 07, 2023, 11:11:26 pm
content: Diac?

author: oPossum
author_rank: Super Contributor
timestamp: October 07, 2023, 11:29:41 pm
content: Thermistor

author: erikbrenn
author_rank: Regular Contributor
timestamp: October 08, 2023, 12:18:40 am
content: A thermistor would measure some resistance wouldn't it....A diac seems very likely yes. thanks
LOREX NVR - WARNING - Page 1
Forum section: electronics / repair

author: fixordie
author_rank: Newbie
timestamp: May 03, 2025, 11:49:10 am
content: A good friend dropped by last night and asked if I could find out what happened to a Lorex NVR 4K+Fusion MODEL: N910A6-Z died with lots of smoke and that made the entire household family feel sick from the smell. I was shocked to find what I did. Scared to know there are people with these boxes in their homes. This was caused by a screw piercing a single CAT6 cable near where the camera was installed. Sorry for the high res photos at the start. Many more normal sized ones to follow. I was just so upset by this I had to post as quick as I could and the pics are from my 4k lab cam.What disturbs me is that the PCB calls for fuses and they used jumpers. There is NO electrical protection on this board with a IC that provided POE. Is this a manufacturing mistake or a cheap-out alteration from engineering spec?These first photos are after I removed the Ethernet quad port module and the preceding chokes.

author: macboy
author_rank: Super Contributor
timestamp: May 03, 2025, 11:54:30 am
content: The 0 ohm resistors installed on pads marked F1 through F8 aren't going to do much good in a fault scenario like that.

author: fixordie
author_rank: Newbie
timestamp: May 03, 2025, 12:08:16 pm
content: The last Lorex NVR I fixed used a MAXIM IC which controlled GATE/LOAD/OUTPUT. This newer unit is just dangerous with no fuses to the outputs.

author: fixordie
author_rank: Newbie
timestamp: May 03, 2025, 12:32:14 pm
content: Back side

author: fixordie
author_rank: Newbie
timestamp: May 03, 2025, 01:00:04 pm
content: Here are some more pics. I've grinded down the fist layer and found some traces that need to be cut and removed all passives from the front/back that aren't require for POE. The board works but no POE and only 4 vs 8 Ethernet (100Mbps) ports.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: May 03, 2025, 10:17:55 pm
content: Could not find any datasheet for the LG48232.Somethingsimilarwith 8 circuits, from the same manufacturer (FPE).Quote from: macboy on May 03, 2025, 11:54:30 amThey are cheaper and never need replacement
Lost Artek manuals - Page 1
Forum section: electronics / repair

author: tatel
author_rank: Frequent Contributor
timestamp: January 20, 2024, 06:56:27 pm
content: Unfortunately, it is obvious that after Mr. Henderson's death, his widow is unable to find HP8640B-AN/USM-323 manual (military version of HP8640B). The same goes for the HP3456A manual. If you read this message and have any of these manuals, perhaps you could send them to Mrs. Henderson... and leave a reply here so I could buy them from her.

author: bdunham7
author_rank: Super Contributor
timestamp: January 20, 2024, 07:17:47 pm
content: HP 3456A manuals available here:https://bama.edebris.com/manuals/hp/3456a

author: tatel
author_rank: Frequent Contributor
timestamp: January 20, 2024, 10:01:20 pm
content: Thank you. Truth is, I already got these... but after getting from artek the manual for non-military HP8640B, if the have a manual for one of my devices, I'm buying it.Not a problem for 3456, thanks to the link you provided. But the manual for HP8640B-AN/USM-323, if not from artek, comes as printed sheets, unbound, unknown quality, 5x the price...

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: January 21, 2024, 01:04:15 pm
content: For anyone concerned...Artek Copies of the 8640 Military have been located and will be on their way to Mrs Henderson if her copies cannot be locatedArtek Copies of the 3456 high resolution manual have been forwarded already.There are folks on the Groups.io HP Agilent forum working on this.We have appreciated the clear copies Artek has provided over the years.

author: tatel
author_rank: Frequent Contributor
timestamp: January 21, 2024, 01:21:38 pm
content: Thank you. I wonder if there are other manuals missing. I ordered these manuals from Artek site last June.

author: Jamie_A
author_rank: Contributor
timestamp: January 27, 2024, 06:41:51 pm
content: Do digital orders on the Artek site work again? Did Mrs Henderson get control of the site back?I'm needing to make an order.

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 27, 2024, 07:05:17 pm
content: I bought 3 manuals last December and they did arrive just fine.

author: tatel
author_rank: Frequent Contributor
timestamp: January 28, 2024, 01:52:14 am
content: Quote from: PartialDischarge on January 27, 2024, 07:05:17 pmWere any of these manuals HP8640B-AN/USM-323 and/or HP3456A? Could you confirm that, please?Artek has been functioning, yes, but Mrs Henderson was unable to locate these manuals.

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 28, 2024, 02:52:24 am
content: Quote from: tatel on January 28, 2024, 01:52:14 amNo

author: edavid
author_rank: Super Contributor
timestamp: January 28, 2024, 05:06:47 am
content: Member SuperMario posted in this thread that he has the Artek HP8640B/323 manual:https://www.eevblog.com/forum/testgear/hp-8640b-opt-323-service-manual/Perhaps he could assist you.

author: tatel
author_rank: Frequent Contributor
timestamp: February 01, 2024, 03:20:09 pm
content: Well, I ordered it again. This time I received it in about 30 minutes.So it looks as if Artek is 100% in shape now
Loud UPS fan - Page 1
Forum section: electronics / repair

author: JohnLeslie
author_rank: Newbie
timestamp: November 11, 2021, 06:42:35 am
content: I have a Tripp Lite SU1500RTXLCD2U UPS. Very loud 80mm fan. Tried to replace with std. 80mm computer fan and it doesnt like it. Apparently there is a tachometer feed from the original fan that does not square with the new fan. Wondering if I can defeat this tachometer input somehow. New fan is almost completly silent. Old one is pushing 30db

author: james_s
author_rank: Super Contributor
timestamp: November 11, 2021, 07:44:27 am
content: I think there was another thread almost exactly like this a few months ago, that person eventually gave up and installed the UPS in the basement.If you want to replace the fan, use an oscilloscope to examine the tach signal. Also make sure the new fan moves as much air as the old one or the UPS may overheat, unless you are sure you will never run it near its full rating.

author: Jeroen3
author_rank: Super Contributor
timestamp: November 11, 2021, 07:47:13 am
content: Have you used an 555 before?

author: coromonadalix
author_rank: Super Contributor
timestamp: November 11, 2021, 11:38:33 am
content: https://electronics.stackexchange.com/questions/396881/using-timer-555-to-obtain-a-frequency-multiplier??you have to know the pwm pin freqency with the loud fan, replace the fan with a lower speed / noise and add the circuit to match the need pwn sensing ....

author: TruslowPJ
author_rank: Contributor
timestamp: February 04, 2023, 07:46:34 pm
content: I know this is an old topic, but figured I'd post an answermy SU2200RTXL2UA appears to be manufactured by Delta, and uses delta fans with the R00 suffix, which means the third wire isn't for tachometer at all, but instead a locked rotor signal that it pulls down to ground when the fan is operating normally. my unit has two fans and as long as I short the third wire to ground on at least one of the two fans, it's happy. if left floating or connected to the RPM sense of the fan, it triggers a fan fault.