hybridfree/eevblog-posts huggingface dataset:
Voltcraft VC920 (rebadged UT71x) DMM strange buzzer behaviour - Page 1
Forum section: electronics / repair

author: dzseki
author_rank: Frequent Contributor
timestamp: June 27, 2019, 08:09:17 am
content: At work we have a Voltcraft VC920 (rebadged Uni Trend UT71x) multimeter, we use it seldom, yesterday I noticed that the buzzer behaves strangely. Upon switching on the multimeter it starts discrusively beeping, very annoying: beep-beep-beep.... Apart from that the multimeter measures well. Going into the menu and setting the low limit too high will change the beep to continuous tone. Setting the limits back to off resumes the discrusive beeping, switching the beeper off from the menu turns the beeper off indeed, but then it does not beep in continuity mode either, of course. The multimeter behaviour is not consistent however, yesterday, for example toggling the beeper on-off solved the issue so long the multimeter was not switched off, today this did not help. Also, the rate of beeping is about 120BPM, sometimes with measuring voltage doubles the speed, then leaving the wires open resumed to 120BPM beeping, but not always.-I’ve tried a brand new battery (although the old one was still good)-I’ve tried to play with the function switch, rocking a little bit-I’ve played with the measuring wire connections.-I’ve opened up the meter, but haven’t seen any obvious sign of failure-In uA and mA range it does not beep (the fuse is open though, we did not care to replce it, well... for a very long time now)I am thinking this should be some microcontroller related issue rather than a true electrical issue. Do you know if there is any way to perform some kind of reset, or reflash the firmware?

author: JFJ
author_rank: Regular Contributor
timestamp: June 27, 2019, 10:11:41 am
content: Quote from: dzseki on June 27, 2019, 08:09:17 amAs the beeping stops when one of the current ranges is selected, this may help:https://www.eevblog.com/forum/testgear/ideal-brand-multimeter-error-(model-61-484)/msg1267225/#msg1267225

author: dzseki
author_rank: Frequent Contributor
timestamp: June 27, 2019, 07:12:17 pm
content: Thanks for the good idea. I've tested and unfortunately the sensing connectors are good, although the problem very well could be this, I'll check the surrounding circuits later.
Voltcraft vc960 - Page 1
Forum section: electronics / repair

author: vlelectroniclab
author_rank: Contributor
timestamp: October 21, 2024, 08:01:15 pm
content: hi,I have a voltcraft vc960 multimeter that I bought new in 2013, when it arrived I put a 9v lithium battery and it lasted for 6/7 years before I had to replace it.then I put some Duracell batteries but it didn't last more than a few years.I had put it aside because I had bought a fluke 28ii, but now I need another multimeter and I took it back.I put a new battery and it lasts very little, it doesn't even last a month.I checked the current it consumes and I found some anomalies.off 0maon in vdc or mv 4.5maon in all other functions 9/10maautomatic shutdown after 10 minutes 1.5mA!!!can someone compare these data?thanks

author: vlelectroniclab
author_rank: Contributor
timestamp: October 29, 2024, 12:35:43 pm
content: Does anyone know the current consumption of multimeters with 9v battery?

author: coromonadalix
author_rank: Super Contributor
timestamp: October 29, 2024, 03:10:01 pm
content: they will vary upon brands, if some have real time clocks in them or not etc ...be patient and pls don't popup / bump too oftenthe dmm chipset datasheet says this dmm chip will consume between 1 - 1.7 ma, if you add the lcd driver and others it should be around this value you mentioned1 month for an 9v cell if it is used often is good, some don't even last like this ... but an 9v cell is not as strong as AA batteries,some of them have 6x AAA inside ...Around 4 ma Amprobe AM-140 9vdc

author: bastl_r
author_rank: Regular Contributor
timestamp: October 29, 2024, 03:28:00 pm
content: Quote from: vlelectroniclab on October 21, 2024, 08:01:15 pmOn my Fluke 88 it is very similar. My Fluke 77/4 only has a few uA after auto shutdown.

author: beenai2018
author_rank: Contributor
timestamp: October 30, 2024, 04:43:39 pm
content: https://www.ultralifecorporation.com/default.asp?LINKNAME=LITRACK&Literature_ID=2693&nAction=GETThis maybe due to a good Lithium battery vs an alkaline. They have approx 50% more energy and better shelf life compared to alkaline .In addition temperature does not affect them as much as alkaline.While the meter may be faulty (1.5ma in Auto shutoff seems a bit high ,many meters consume as much when active) ,I'm wondering if that is due to a bad battery.

author: bastl_r
author_rank: Regular Contributor
timestamp: November 26, 2024, 07:23:27 am
content: QuoteA 9V battery is flat after around 100 to 130 hours.Generously rounded up, this corresponds to just one week.
Voltech AT3600  - Page 1
Forum section: electronics / repair

author: whonline
author_rank: Newbie
timestamp: March 20, 2022, 07:34:00 pm
content: Does anyone know how to gain access to the front panel LCD of an AT3600? The LCD is missing pixels. I have removed all visible screws holding the front panel and the side panels and removed the plugins from the rear.I have contacted Voltech tech support but was refused any assistance or advice. They no longer support this product. Very shoddy customer support in my opinion.
Voltech PM3000A rebooting itself after a while - Page 1
Forum section: electronics / repair

author: kahuna0k
author_rank: Regular Contributor
timestamp: October 22, 2021, 02:30:45 am
content: Hi,I was able to get a Voltech PM3000A "not working for parts" VERY cheap. When I powered it up, it boots up, it seems to be working! I try some measurements and yep, it works pretty well.But after a couple of minutes or so it rebooted itself. It kept working for another while and then reboots again. That cycle continues for ever, it seems that when I'm actually using it (pressing buttons and changing settings) it takes longer to reboot (although it could be some kind of bias, I need to actually time it.First, I thought that it could be something getting hot and failing, but the fact that after reboot, it takes a while to reboot again makes me think that there is something broken in the logic. A visual inspection doesn't show anything clearly broken, I suppose I'll have to dismantle it and try to see what happens when it reboots with an scope, but I do not know even where to start. Any clue?
VRM module of VXI electronics. Pb of value vcore - Page 1
Forum section: electronics / repair

author: GGMM
author_rank: Frequent Contributor
timestamp: February 25, 2025, 04:14:57 pm
content: Hello,I have always had difficulties on my Atlas 757 motherboard to start this one. (it is a recovery card)After analysis I think the VRM (VXI electronics) installed is not good.It is a 073-20723-29 that provides a voltage of 2.9v for the core. This seems to be correct for AMD K6 166 or 200Mhz processors.But the installed processor (probably a hack?) is a K6-2 300Mhz and in principle the Vcore should be 2.2vYou can find this processor voltage information at cpu-world.com.Can this explain the start-up difficulties?Can you confirm? or unimportant? In any case by making stops start the card does not start anymore.... LOLNow, can this VRM card be modified to have in case or 2.2vProbably a resistance bridge to be modified?.Problem, no schematic found for the 073-20723-29 VRMYour opinioncdtsee screen when mother had start --> K6/2/300mhzSee documentation of atlas motherboard p12 (Step2 configure CPU)

author: GGMM
author_rank: Frequent Contributor
timestamp: February 25, 2025, 04:26:36 pm
content: Ha!!Found an example:https://www.tindie.com/products/retropartspt/s7-vrm-socket-7-motherboard-voltage-regulator/cdt

author: GGMM
author_rank: Frequent Contributor
timestamp: February 25, 2025, 04:39:22 pm
content: re,I think I have found the solutionthere is a UCC3880 chipWhen we look at the documentation, the voltage is driven on 4 bits. See doc, it seems feasiblecdt

author: GGMM
author_rank: Frequent Contributor
timestamp: February 25, 2025, 05:42:39 pm
content: reBingo, on the other side, you have plugs to weld resistors of 0 Ohm. So there, it will be enough to desweld the 2 resistors of 0 Ohm (For Made 2.9 V) to place them at the other locations to have 2.2v.In fact, we can do all the supply of the table. COOOL!cdt
VSA E4406A need schematics, its dead - Page 1
Forum section: electronics / repair

author: lasvegas
author_rank: Newbie
timestamp: August 12, 2020, 09:29:16 pm
content: HiI have a E4406A SA but it won't power on at all.I found a schematic for the fan card herehttps://community.keysight.com/thread/21575but I can't find a schematic for the A6 power supply.So far it appears the power supply is dead.

author: lasvegas
author_rank: Newbie
timestamp: August 12, 2020, 09:52:11 pm
content: Note, I pulled the cards and supply still dead as per the service manual.https://www.keysight.com/upload/cmc_upload/All/E4406-90178.pdfbut need the CLIP (schematics part list) for the power supply

author: Tony_G
author_rank: Super Contributor
timestamp: August 15, 2020, 02:20:12 am
content: Just coming back to this because the OP posted on the HP groups.io forum and someone there had the PS & Fan Controller CLIPs.Just in case someone else goes looking for this info.https://groups.io/g/HP-Agilent-Keysight-equipment/topic/76172489TonyG

author: ik8tng
author_rank: Newbie
timestamp: October 02, 2023, 05:06:03 pm
content: Hello everyone, I'm referring to this post, the only one I've found, to ask and perhaps share my experiences, I'll get to the point. The instrument in question, E4406A, turns on abnormally. The first startup was successful but disconnecting one or more cards, RF IF SINCH. I replaced the two 100k resistors on the fan board, thanks to a suggestion from the forum. Before replacing the resistors, I saw two red LEDs light up on the fan board. After installing the two new resistors, the red LEDs remain off. I have checked all the output capacitors of the power supply, ALL GOOD. WHAT HAPPENS: IF I TRY TO TURN ON THE INSTRUMENT without the RF IF and SINCH cards, it turns on and after a while, about 5 seconds, the screen remains white without booting.However, if I try to turn it on, by turning on I mean pressing the button on the front, the instrument DOES NOT start, the fans do not start and the green LED on the front indicates an attempt to turn it on but it does not start. Same behavior as the 4 LEDs located behind on the motherboard.I soldered a series of thin wires onto the power supply outputs and measured the voltages. Voltages present, at least the main ones, and only if I turn it on WITHOUT the cards. I have no idea if it's possible to test the power supply off-site, but I did it anyway. I find the fixed voltage of 15 volts on pin 1 and the remaining voltages are in fact intermittent. maybe without load it will be normal? Who knows more? Thanks
VT239WF - Datasheet - Replacement - Page 1
Forum section: electronics / repair

author: 2X
author_rank: Frequent Contributor
timestamp: June 20, 2024, 06:52:39 pm
content: Hello,I have shorted the "VT239WF" regulator. The input of the regulator was 12V and the output 3,3V. I can't find it in the same BGA footprint to buy it and also I can't find any datasheet of it at all in order to replace it with another regulator. Does anyone has a similar datasheet of the same series/type regulator (in BGA footprint) or knows where could I buy a new one?Thanks in advance.

author: wraper
author_rank: Unknown
timestamp: June 20, 2024, 09:51:00 pm
content: It's VT239WFC-ADJ and has been discontinued in 2021 according to this documenthttps://www.allelcoelec.in/datasheets.4f/MAX3374EEKA.pdfNearly zero chance there is any pin compatible IC.

author: 2X
author_rank: Frequent Contributor
timestamp: June 21, 2024, 05:59:01 am
content: Quote from: wraper on June 20, 2024, 09:51:00 pmif I had a datasheet to see the pinout I would do a modification with another regulator.

author: 2X
author_rank: Frequent Contributor
timestamp: June 21, 2024, 06:25:25 am
content: Do you know why there no datasheets on the internet from these regulators?

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 21, 2024, 06:36:48 am
content: Just Volterra thing. Fabless company, B2B supplier, everything under NDA.

author: 2X
author_rank: Frequent Contributor
timestamp: June 21, 2024, 07:17:29 am
content: Quote from: ArdWar on June 21, 2024, 06:36:48 amIf anyone has a datasheet from a similar VT series regulator... please upload it.Thank all of you for your replies.
VTR3-003 BeckElec - Page 1
Forum section: electronics / repair

author: comsec22
author_rank: Contributor
timestamp: May 26, 2023, 11:27:29 am
content: Hi Folks,I need to replace this 10 Mhz oscillator (BeckElec) part of a Symmetricom XLi .. any one has the data sheet ?Thank You
VTVM lead wire gauge? - Page 1
Forum section: electronics / repair

author: driador
author_rank: Newbie
timestamp: November 28, 2023, 01:58:45 am
content: Greetings all,I'm looking to fix up my TS-505D/U vtvm, part of which entails replacing the lead wires and power cable. The latter part is easy enough to source, but I'm not sure as to the gauge of wire for the leads. Unfortunately, the TM for the set doesn't specify what wire the leads are made from. FWIW, that meter is rated up to 1000vdc, so I would like to replace the lead wire with something that can handle the same, preferably in red, black, green and blue with a very flexible insulation.If anyone knows where to source a replacement or something equivalent, I would be most appreciative.TIA
Vu plus receiver turn off when connect the satellite signal cable - Page 1
Forum section: electronics / repair

author: Chabane
author_rank: Newbie
timestamp: January 18, 2023, 02:02:01 am
content: I have a Vu plus receiver uno 4k when I just connect the signal cable in one of lnb input make the receiver turn off .I tried with more than two deferent signal cable

author: inse
author_rank: Super Contributor
timestamp: January 18, 2023, 05:30:08 am
content: Maybe the LNB supply is overloading, measure the resistance between center and shield.

author: Chabane
author_rank: Newbie
timestamp: January 18, 2023, 07:50:57 am
content: I found 1049ohm

author: inse
author_rank: Super Contributor
timestamp: January 18, 2023, 08:14:12 am
content: 🤔
Vulcan Dishlex Milano Dishwasher Repair Article - Page 1
Forum section: electronics / repair

author: sausage
author_rank: Regular Contributor
timestamp: October 28, 2021, 11:22:07 pm
content: Here is my article outlining the repair job done on my Vulcan Dishlex Milano Dishwasher.I couldn't find any information about this dishwasher, schematics or diagrams, or really any references to it at all. Perhaps it was an import rebrand? In any event, I had to fly blind and learn. Hope you enjoy the read and hopefully it helps someone else out with the same machine.https://blog.waynejohnson.net/doku.php/vulcan_dishlex_milano_dishwasher_repair

author: sausage
author_rank: Regular Contributor
timestamp: October 28, 2021, 11:46:08 pm
content: Also hoping someone might be able to help me verify the date of the machine or at least the EPROM on the board:The code is: 30 / 10 / 05 / 95I've interpreted that as a date: 30/Oct/2005, but it could also be: 10/May/1995.Any thoughts or opinions?

author: BrokenYugo
author_rank: Super Contributor
timestamp: October 29, 2021, 12:00:06 am
content: 1995 seems more likely for a PDIP EPROM or microcontroller in a consumer grade appliance, same for the axial electrolytic capacitor. I could be wrong but I read the date code on the LM339 as 44th week of 94.

author: sausage
author_rank: Regular Contributor
timestamp: October 29, 2021, 12:12:37 am
content: Thanks @BrokenYugo, that was a clever way to work it out. 1995 would make more sense as it does seem older than 16 years. But I just couldn't work out how to tell.
VW Eurovan ECM - part id help!!!! - Page 1
Forum section: electronics / repair

author: willb
author_rank: Regular Contributor
timestamp: June 26, 2021, 12:09:59 pm
content: I am trying to help someone out with the repair of a vintage 1992 VW Eurovan engine computer. I have found a bad transistor which tests as a diode on my Atlas DCA55. It is made by Motorola, in a package I have not seen before (I mainly repair commercial audio equipment), and has markings of 104 and 112. I believe 112 is the PN however I can not 100% identify this part. I know Motorola (Onsemi) makes the TIP112, but there is also a J112 Fet out there, and the MJD112 (which seems to be a TIP112 in a different package). If anybody can shed some light on the part that would be amazing!Thanks!!!

author: Manul
author_rank: Super Contributor
timestamp: June 26, 2021, 01:10:18 pm
content: I would vote for MJD112. But I would test it more first, you cannot always trust automatic tester, especially because if it is MJD112, it is not a simple transistor, but a darlington with integrated diode and some biasing resistors.

author: esepecesito
author_rank: Regular Contributor
timestamp: June 30, 2021, 05:14:51 pm
content: No idea of what it is, but you can check the pinout: the metal pad mus be connected with the collector or the drain, check if that is consistent with the datasheet of the part you will try.Also use a tester with diode testing, and try to find out what diodes are still alive (if any) and also check if that is consistent with the replacement.

author: fzabkar
author_rank: Super Contributor
timestamp: June 30, 2021, 07:53:12 pm
content: MJD112 seems to fit the package and application.See pages 437 and 438:https://mirrorservice.org/sites/www.bitsavers.org/components/motorola/_dataBooks/1994_Motorola_Semiconductor_Master_Selection_Guide.pdfhttps://mirrorservice.org/sites/www.bitsavers.org/components/motorola/_dataBooks/

author: esepecesito
author_rank: Regular Contributor
timestamp: June 30, 2021, 08:08:53 pm
content: Yeah. Pretty much. If you want to be sure do the test (middle pin and slug) they should be connected, both collector.Also other test you can do (to make sure there will be no smoke) is test that the emmiter (3) pin is GND in the PCB. And the base --pin1-- (when still transistor is not placed) the voltage is not greater than say 5V other so.
VW T5 windshield wiper problem - Page 1
Forum section: electronics / repair

author: Maxwonga
author_rank: Newbie
timestamp: June 04, 2024, 10:01:36 pm
content: I am trying to diagnose a potentially failed relay mounted on a control module on my van. There are several known issues that can make the wipers fail one being this relay failing and even after a diagnostic vehicle scan it doesn’t point to the exact problem. My question . is there a way to test the relay while it is still on the board ?Sorry I am newbie at electronics diagnosisThanks
VXI E1406A Command Module - Page 1
Forum section: electronics / repair

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 22, 2022, 08:52:11 am
content: Anyone with any experience? The Failed and Sysfail LEDs light up after boot as they are supposed to, go out as they are supposed to but the ready light does not come up...Can't seem to get to it over GPIB (I'm admittedly quite green on that front, though)...RS works better and get me this:It was my understanding the device should then start enumerating slots, but there's nothing after this message. I thought perhaps because no cards were installed but adding two cards changes nothing.Thoughts?

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: December 24, 2022, 11:31:44 am
content: Hi Kris,set the Address of the Command-module to 0 (ladd=Zero).What terminal-emulation are you using?With VT100 or VT220 you should display a menu (System, set time and date, reset, etc....).Use the function-keys there for the menu-items.Hope it helps.Happy holydays.

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 26, 2022, 08:14:56 am
content: Quote from: Roehrenonkel on December 24, 2022, 11:31:44 amHey,Thanks for the pointer. I was just using Putty. It's worth looking into these emulators, then?

author: dietert1
author_rank: Super Contributor
timestamp: December 26, 2022, 10:49:28 am
content: The E1406A boots and the last message is about VME bus timeout, so there could be a hardware problem.We have some E8401A crates and they have a front panel connector for checking the supply voltages. I mean some tantalums develop a short while on shelf for long time.Also i would look at the backplane connectors. They should be clean and no bent or broken pins.Regards, Dieter

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: December 27, 2022, 06:29:44 pm
content: Quote from: Ice-Tea on December 26, 2022, 08:14:56 amHi Kris,you can do without, but you'll have to type a lot more (see the PDF).Have you set ladd to 0?Ciao4now,Michel

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 28, 2022, 10:53:15 am
content: Quote from: dietert1 on December 26, 2022, 10:49:28 amI have two E8401A's that both have supply issues. This one is a HP 75000 that does not seem to have issues ;-)Quote from: Roehrenonkel on December 27, 2022, 06:29:44 pmHah! VXI1600! Now I remember ;-)Quote from: Roehrenonkel on December 27, 2022, 06:29:44 pmIt was already set to 0. So I dived inside. The DIP switch itself measures fine but there is someeau de batteriefume damage all around the board. No vinegar around for the moment, so that will have to wait for another day.
Walki Boafeng Repairing - Page 1
Forum section: electronics / repair

author: supertrabuco
author_rank: Contributor
timestamp: April 07, 2024, 08:11:46 pm
content: Hello, I am repairing a Boafeng walkie-talkie and when I replaced the power output transistor, a couple of resistors blew out and I think there was a capacitor next to the transistor.The schematics that I have found do not correspond exactly since there are several versions of the electronic board because I have also opened another boafeng and it was not the same either.I would be very grateful if there is any colleague who has experience with these Chinese and can give me some guidance on where they go and the values ​​of the components.Thanks and regards

author: Teledog
author_rank: Regular Contributor
timestamp: April 08, 2024, 03:11:09 am
content: Hi,I don't mean to "rain on your parade", but a Baofeng dual band radio sells for ~$20-$24 on Ali express - free shipping.It isn't worth taking apart, never mind ordering parts & going thru hell replacing them.Strip it for parts, if you so desire, and then toss it?My 2 cents anyway.G'Luck!

author: supertrabuco
author_rank: Contributor
timestamp: April 09, 2024, 09:15:45 pm
content: Quote from: Teledog on April 08, 2024, 03:11:09 am
Wall PS how to check volt a diff points (pulsating problem)? - Page 1
Forum section: electronics / repair

author: Serge125
author_rank: Regular Contributor
timestamp: February 15, 2021, 07:10:29 pm
content: Hi allOk I have an inflatable Christmas decoration and the blower motor "pulsates" and I would like to find from where in the SP it's doing this. I have checked the fan motor with my bench PS and the motor is turning as it should so traced the problem to the wall PS. I did an amp test with my meter to see if it would get the value and I do get the 1.7-1.6 amp (same value on mu bench PS) BUT when I did this test the fan ran normally and the moment that I re solder the PS wire back to the motor it's just keep pulsating again. So I wanted to check voltage values at some points on the PS motherboard but there isn't a chassis like a tv to put my - lead on. Can I use my bench PS gnd input as a substitute "chassis" for this? If not how can I check voltage a diff points on the PS.THANKS for any helps!!Serge

author: Serge125
author_rank: Regular Contributor
timestamp: February 18, 2021, 09:45:49 pm
content: any one???
Wandel Goltermann NFA-1, Stops Booting, no Display, All LEDs on - Page 1
Forum section: electronics / repair

author: brummi
author_rank: Newbie
timestamp: February 02, 2021, 09:31:15 pm
content: Hi members,tried to use my NFA after a long time but no success. It stops booting and no display no beep nothing. After pulling boards it turns out that the display CPU makes some trouble.Next problem is that I have no schematics from that board. There are 3 EPROMs on that board and that was the first thing to look at. One EPROM is dead.Does anybody can help me with a copy of the firmware?? That would be great. Many thanks in advanceCheersGünther

author: VALTERLED
author_rank: Newbie
timestamp: February 09, 2021, 10:18:30 am
content: Hello,I just come out, from a repair of Wandel Goltermann SPM19. Same issue as you. It was faulty EPROM. I was a bit luky that my unit would boot with some heat on the EPROM. Can you try to warm a bit? If it works with abit of heat you can copy the EPROM then.The problem was very strange, I posted the details somewhere in EEVBLOG.These EPROM are becoming old and they are dying.Keep searching in the usual places for the FW.Valter
Wandel & Goltermann PMG-3 AF level measuring set - Page 1
Forum section: electronics / repair

author: vk2jdh
author_rank: Newbie
timestamp: February 09, 2025, 07:06:44 am
content: I powered it up and it ran OK for several minutes, then the level display stayed at -48db or so and the frequency at 00000I've downloaded the service manual. and going to measure the voltage rails first,It emitted a slight 'smell' like tantalum caps so one might have gone short.Any tips
Wandel & Goltermann SNA-23 c-0022  - Page 1
Forum section: electronics / repair

author: dimitris2
author_rank: Newbie
timestamp: September 05, 2024, 12:38:55 pm
content: Hallo 😊I have a Wandel & Goltermann SNA-23 c-0022 and i would like any help you can give me......After the starting processDrive not ready errorInsert boot diskette in A:Press any key when ready

author: m k
author_rank: Super Contributor
timestamp: September 10, 2024, 07:28:09 am
content: Its type 8 hard disk is not operational.

author: Gerhard_dk4xp
author_rank: Frequent Contributor
timestamp: September 14, 2024, 09:40:58 am
content: Hi,there was a long thread here on SNA23-33 repair.Zebra stripes on the display and such.Drive A: and B: are both the floppy drive, with mechanicalswapping. C is the flash board, can be changed onlywith a special bootable service disk.There are 2 batteries: The usual Dallas clock chip with built-inbattery that was common in old PCs and an orange Renatalithium battery.<https://www.eevblog.com/forum/repair/wg-sna-2023-spectrum-analyzer-repair/50/>The service disk is probably from the old thread.The dd_from.... file is a image file made with the Linux command dd ( = disk dump ).
Wangscap electrolytic capacitors - Page 1
Forum section: electronics / repair

author: 1980s_john
author_rank: Contributor
timestamp: May 02, 2024, 03:29:17 pm
content: No I had a never heard of them either until I delved inside an Atari ST computer from 1986. Here's someone else's photos (top row - bottom are replacements):https://content.invisioncic.com/r322239/monthly_01_2009/post-5182-1233128091.jpghttps://content.invisioncic.com/r322239/monthly_2022_02/PXL_20220227_101204907.PORTRAIT.jpg.a5efa6e428c5a7245f2ebd7a71e301da.jpgMine seem fairly good (computer still works), just wondered what happened to the company?Regards,John

author: amyk
author_rank: Super Contributor
timestamp: May 03, 2024, 10:05:54 pm
content: https://www.findcompany.com.tw/trademark/00259990_073011038王氏電容器廠有限公司Trademark registered 1984, seems to have expired in 1994.

author: 1980s_john
author_rank: Contributor
timestamp: May 03, 2024, 10:54:42 pm
content: Thanks!
Want To Buy Sencore SC3100 Probes with the DVC option - Page 1
Forum section: electronics / repair

author: bOTL
author_rank: Newbie
timestamp: November 13, 2020, 12:40:01 am
content: HelloI would like to purchase 2 Probes for a Sencore SC3100 with the DVC option.If anybody has a pair or knows where I can get them please let me know.TIAModify message
Want to Bypass the VS Switch on a Dremel Tool - Page 1
Forum section: electronics / repair

author: Larsson55
author_rank: Regular Contributor
timestamp: October 20, 2021, 05:32:29 am
content: I have this Dremel tool (made by a Canadian Co.) about 15 years old and the VS switch is gone (works only at very low speed). I was thinking if there is way to bypass (remove) the VS switch and connect the power straight to the motor brushes and then use a router speed control I have (shown on last picture) to control the speed.The pictures shows the motor with the VS module plugged at the end. This module has 4 pins plugging into the motor and I have identified each pin for help.One solution I see possible (without much knowledge on motors) is to use a jumper wire to connect terminals A & D and this will put the White wire into one brush.Then I will remove the VS switch connections from terminal B and jumper again terminals B & C and that will put the Black wire into the other brush.However since I now changed the 4 pins layout plugging into the motor I have no idea if the above will work and I’m asking for your help.Thanks

author: Larsson55
author_rank: Regular Contributor
timestamp: October 20, 2021, 05:43:32 am
content: Sorry, I forgot one picture which I think is important
Want to help me fix my trailcamera? - Page 1
Forum section: electronics / repair

author: IdahoMan
author_rank: Regular Contributor
timestamp: May 11, 2020, 08:29:43 pm
content: No trail-camera I have ever purchased has lasted more than a year (why I don't buy them anymore.. Bushnell, Spypoint).I have a Spypoint Force-10 and it won't start up, just a blank (white) LCD screen for a few seconds then black and won't come on at all after that. On another forum where someone else was having this issue, Spypoint customer service said it was a "hardware issue".I honestly don't think anything can be done other than to toss it in the trash, but if anyone here has an idea that might help I'm ready to open it up. I have no oscilloscope, just a multi-meter.Thanks.

author: cdev
author_rank: Super Contributor
timestamp: May 11, 2020, 09:46:00 pm
content: Could you provide more information? A URL of the best into on the camera you can find and maybe a photo of it as you have it now. Since youre ready to throw it away why not open it up and take as good of a high res picture as you can of the PCB that shows as much of the wiring as possible. Perhaps if something is obviously broken it will be visible.You can add it to the bottom of your post.
Wanted (in UK) Laser Shutter Arm (RB1-8700-000CN) for Laserjet 4000/4050 - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: November 14, 2023, 11:57:07 am
content: This little lever opens the laser shutter so that laser can write onto the toner drum.Does anyone (ideally in the UK) have an LJ4000/4050 spares unit that they can salvage this from please?

author: t1d
author_rank: Super Contributor
timestamp: November 16, 2023, 01:21:12 am
content: On your other post looking to identify a broken white piece, I posted a link to a parts supplier. Look there to see if you can still buy the part. Try lots of parts houses. Some will have stock, when others don't. Ebay, too. If not, and you still have all of the pieces of the lever... and you have a friend with a 3D printer... Or a "Makers" group nearby... Maybe you can get it printed. HTH.

author: perdrix
author_rank: Frequent Contributor
timestamp: November 16, 2023, 12:00:08 pm
content: I telephoned Printer Maintenance Limitedhttps://www.printermaintenanceuk.comand they called me back about ten minutes later to say they had the part!I received it this morning (next day delivery) and the printer now works again!Woohoo!David
Wanted - Datron 4xxx Power Input Module and Binding Post - Page 1
Forum section: electronics / repair

author: essele
author_rank: Frequent Contributor
timestamp: April 25, 2019, 06:26:07 pm
content: Hi,So I bought a 4200 for spares, but with a bit of love and some new tantalums it's now a completely functional unit other than missing a couple of key items, namely:1. The mains input connector and filter, which is broken, it's a Potter 7100-00022. The brown (I+) binding postDo any of my fellow Datron fans happen to have either of these items available for sale?
Wanted - Datron 4xxx Power Input Module and Binding Post - Page 1
Forum section: electronics / repair

author: essele
author_rank: Frequent Contributor
timestamp: April 25, 2019, 06:24:38 pm
content: Hi,So I bought a 4200 really for spares, but with a bit of love and some new tantalums it's now a completely functional unit other than missing a couple of key items, namely:1. The mains input connector and filter, which is broken, it's a Potter 7100-00022. The brown (I+) binding postDo any of my fellow Datron fans happen to have either of these items available for sale?

author: branadic
author_rank: Super Contributor
timestamp: April 25, 2019, 06:48:37 pm
content: QuoteSimply search for "Corcom 6J4" on ebay:https://www.ebay.com/itm/Corcom-6J4-F7007-Power-Entry-Module-lot-of-10-NOS/173039348521https://www.ebay.com/itm/Corcom-6J4-F1881-Power-Entry-Module-lot-of-10-NOS/173039343667It has the same patent number printed on it so they seem to be the exact replacement.-branadic-

author: maginnovision
author_rank: Super Contributor
timestamp: April 25, 2019, 06:54:05 pm
content: Those look pretty good. For binding posts I'd just find whatever you like that has enough colors, or just buy some of same color and pay attention which you'd no doubt be doing anyway.

author: essele
author_rank: Frequent Contributor
timestamp: April 25, 2019, 06:55:34 pm
content: branadic you are a star -- thanks, that's given me a useful pointer and I've found a few UK ones as well.
Wanted for repair: PIC17C42A-33I/L - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: October 13, 2021, 05:16:12 pm
content: I need one (right now) of these for a repair (assuming I can pry the binary image out of the product vendor).Translated that's a PIC17C42A 33MHz variant, Industrial temperature range, PLCC package.There seem to be none in the channel and Microchip don't appear to have any either.Does anyone have a few of these stashed away somewhere? Happy to buy a few if I can get the image!ThanksDavid

author: DavidAlfa
author_rank: Super Contributor
timestamp: October 15, 2021, 03:17:01 pm
content: I've found them at arrow/digikey and such, but minimum order of 108, (800€ / $930)I have a fossils from that era in my junk drawer...

author: perdrix
author_rank: Frequent Contributor
timestamp: November 04, 2021, 04:04:58 pm
content: Discovered that the PIC17C44 can be subbed for the PIC17C42A w/o problem so used that.
Wanted: Leader LDC-824 520MHz counter service manual - Page 1
Forum section: electronics / repair

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: December 29, 2020, 01:48:06 pm
content: Hi everybody,looking for the service manual for a LDC-824 520MHz counter..Google only spits out this one, but the scan quality is really really bad:http://manuali.mediasurplus.it/Leader/LDC-824/LDC%20824%20824S%20SERVICE%20MANUAL.pdfDoes anyone have a better copy?

author: JabbaLeChat
author_rank: Newbie
timestamp: February 10, 2021, 10:20:23 am
content: The 823 is almost the same, some pre-scaler difference.Reasonable quality copy here...https://www.opweb.de/english/company/Leader/LDC-823S#5691
Wanted : Parts for a Rohde & Schwarz FSIQ analyser - Page 1
Forum section: electronics / repair

author: zhumoumou01
author_rank: Newbie
timestamp: June 08, 2021, 03:37:21 pm
content: I need a Rohde & Schwarz FSIQ26 step attenuator, the model is RSS STEP ATTENUATOR 70dB, DC-26.5GHz 1W 1046.5024.04, which engineer will buy it if there is one, thank youMy attenuator failed, and the 40dB attenuation part was burned out, which caused the current calibration to fail, so I need a new attenuator to restore the spectrum analyzer function
(Found!) Wanted: Rohde & Schwarz FSEA service floppy disk and/or schematics - Page 1
Forum section: electronics / repair

author: analogRF
author_rank: Super Contributor
timestamp: August 13, 2019, 01:06:24 pm
content: Does anyone have or know where to find the service floppy disk that would come with R&S FSEA FSEB FSEM spectrum analyzers?also any parts of the schematics for FSEA30 is highly appreciated.thanks

author: analogRF
author_rank: Super Contributor
timestamp: August 13, 2019, 05:36:01 pm
content: I asked R&S tech support for the service floppy disk and to my surprise they sent me the attached REPKIT.EXE file!Now I think this is a compressed file which opens up on a floppy and will have all the service routines in itHowever I cannot run it on my Win7 x64 and don't know how to make it happenIf somebody can open this and make an image of the resulting floppy or just make a copy of the whole unzipped filesit will be highly appreciated.w.r.t, schematics the guy asked their support in Germany and came back saying they don't have themat least not in digital form anyway....EDIT: I believe this is the same service floppy disk that is also used in troubleshooting ZVR ZVC, etc... network analyzers

author: analogRF
author_rank: Super Contributor
timestamp: August 13, 2019, 07:03:49 pm
content: I ran the REPKIT.EXE in DOSBox and it produced the following files.I need to make a floppy (actually two floppies)however from the readme file it seems that this is only good for repairing the file systemand may not contain the GR_CHECK.EXE and FSE_IO.EXE routies that are used in troubleshooting.Not sure yet because they might be buried in that .bin fileDOSREP.EXE inflates into basic DOS files for bootingdoes anybody know the service password of FSEA/FSEB that is used to enable service functions?

author: analogRF
author_rank: Super Contributor
timestamp: August 15, 2019, 12:40:22 am
content: I found the service password for FSEB FSEA etc...it is 894129
Wanted: Schematics for Loewe MB180 chassis - Page 1
Forum section: electronics / repair

author: jogri
author_rank: Frequent Contributor
timestamp: June 05, 2020, 08:06:25 pm
content: Hi guys,i am trying to fix an older Loewe TV (Xelos 32), but i can't find any schematics for that particular model (there are a lot of manuals for the 2650 chassis and/or the Xelos 32A, but not for the MB180 chassis). Does anyone of you happen to have those schematics? I tried contacting Loewe, but apparently they decided to no longer give away service manuals (they had a FTP server with almost all service manuals until a few years ago).The problem: TV doesn't power up and just sits there in standby. Seems to be Loewes way of displaying faults, they just pull up the cathode voltage of the photodiode in the optocoupler -> disables the main transformer, also used for normal standby. Neat trick.

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: June 06, 2020, 08:18:26 pm
content: If memory serves well, that chassis blinks the orange LED to give some indication of the fault. Not sure if this model did that.

author: jogri
author_rank: Frequent Contributor
timestamp: June 08, 2020, 10:43:18 am
content: No, this model doesn't blink at all, it just sits there with the orange/red LED lit up. Could be the power board, but none of the usual suspects were defect so the fault is probably somewhere on the main board (don't know if i could fix that, lots of 0204 and unlabeled chips).
Wanted: schematics for Roland CUBE 40GX guitar amplifier - Page 1
Forum section: electronics / repair

author: Greybeard
author_rank: Frequent Contributor
timestamp: October 07, 2024, 10:25:06 am
content: I need schematics for Roland CUBE 40GX guitar amplifier.Maybe someone can help me...

author: Jesse_G_EE
author_rank: Newbie
timestamp: December 11, 2024, 03:27:29 pm
content: Not sure if your amp is in this list but its a start:https://el34world.com/charts/Schematics/files/roland/Roland_Schematics.htm

author: picburner
author_rank: Frequent Contributor
timestamp: December 12, 2024, 05:05:27 am
content: The service manual for the Cube-40GX is virtually unobtainable (At least for free).You can find one for the40LX(Choose Service Notes).It depends on what you need to do, maybe there are some similarities.

author: Greybeard
author_rank: Frequent Contributor
timestamp: March 07, 2025, 08:00:53 pm
content: Thanks for the 40 XL service manual.It looks similar but there are differences.
Wanted: service manual for Mettler analytical balance Series AE - Page 1
Forum section: electronics / repair

author: benj38
author_rank: Frequent Contributor
timestamp: August 08, 2023, 07:14:01 pm
content: I am looking for the service manual of Mettler Toledo analytical balance series AE... & AE...S.I have the operating manual.A web search yields the following cover page, but alas no manual in either electronic or printed form is to be found for download or purchase.Any help would be highly welcome.

author: Keno1981
author_rank: Contributor
timestamp: October 22, 2023, 07:17:57 am
content: here you have manuals of mettler hope it helps
Wanted: Service Manual R&S SWM 02 - Page 1
Forum section: electronics / repair

author: TonyBe
author_rank: Regular Contributor
timestamp: October 30, 2020, 11:49:31 am
content: Hi,I'm working on a repair of a Rohde and Schwarz signal generator. Unit name is "SWM 02". It's an 0-18 GHz generator.Sadly I do not have any documents for it, which makes it very hard for me to get started with the repair. I cannot find anything on the web as well..Did any one of you can help me out? A picture or a scan of the block diagram and some schematics would really help me out.Looking forward!Thanks in advanceRegardsTony

author: Robert763
author_rank: Super Contributor
timestamp: April 05, 2025, 08:32:03 pm
content: Bump,Old thread but I'm also looking for any documentation for the SWM signal generator SWM05 or SWM02Robert.Quote from: TonyBe on October 30, 2020, 11:49:31 am
Wanted: SMIQ 03B Fan Board Schematic - Page 1
Forum section: electronics / repair

author: zmetzing
author_rank: Contributor
timestamp: June 07, 2021, 06:16:31 am
content: I'm looking for the Fan Unit (1084.8904.02) schematic. A short in the fan lead smoked R12 & R13, which I can replace with parts specified in the service manual, but I'd like a schematic for completeness.Thanks!

author: Antonio Borda
author_rank: Newbie
timestamp: August 28, 2021, 08:50:53 pm
content: Good evening,tomorrow I can send you the valuation of resistances.
Wanted: Tek 577 Step x.1 knob or a sketch for 3d printing - Page 1
Forum section: electronics / repair

author: rodd
author_rank: Regular Contributor
timestamp: June 05, 2023, 11:26:09 am
content: Dear all,I happened to destroy this knob while trying to fit it in.It broke in dozen of pieces so it is impossible for me even try to glue the pieces together to allow me to draw a sketch for 3D printing.So I am asking the forum for a sketch, since it seems this knob has been an unobtainium part since a looong time ago.Thanks to all.Roger
Wanted: Tool Lab SL-30 (soldering station) schematic diagram - Page 1
Forum section: electronics / repair

author: Geert
author_rank: Newbie
timestamp: May 20, 2021, 07:36:36 pm
content: Looking for the schematic diagram of a soldering stationTool Lab SL-30I already googled but it does not brings me much usable.Any information is welcome.
Washer Beko WTV8744XW Door lock cycling - Page 1
Forum section: electronics / repair

author: bc546kkkk
author_rank: Newbie
timestamp: June 21, 2023, 01:23:49 pm
content: Hi Beko washing machine is in working order, while it has one defect, when turned on its cycling door lock, opens and closes it repeatedly and after a few cycles it stops in the closed position. The washing cycle goes normally. Replacing the lock did not help. Wires to the lock are ok. Controller, no damaged components visually and after measuring resistors, triacs, transistors and diodes. Voltages ok, once E29 appeared. Other than that, it works normally. After the wash cycle, the same thing happens opens and closes several times and finally does not open. Maybe someone has an idea?

author: m k
author_rank: Super Contributor
timestamp: June 25, 2023, 12:51:09 pm
content: So assumed missing energy to solenoid.You must measure how far back it goes.Voltage checks must also be as close to the end as possible.There can always be a bad contact somewhere in between.
Washing machine with Vestel board - Page 1
Forum section: electronics / repair

author: Mandami
author_rank: Newbie
timestamp: July 14, 2023, 12:17:03 am
content: I'd like to fix a washing machine which stopped working because the drainage pump got stuck. I also learnt there was some smoke (I wasn't there to confirm).I cleaned the pump and the PCB shows some traces of smoke on the plastic above the PWM of the main motor but there are no traces of failure on the PCB itself (visual inspection).If the machine is left off for some time (main rotary knob in O position), then when spinning the knob again no matter in what position (wash, rinse, spin) only the LEDs for WASH+600 are active (green arrows in the attached picture). It doesn't start washing and it doesn't respond to any service test.If the rotary knob is left on some option (other than O) for some time (5-10 minutes) then, by magic, it comes back to life: you can select whatever option you want and it starts/stops as it should.Is it possible the PSU to have some damaged and the uC doesn't power properly (or there is too much noise on the DC) but as it heats up, then everything go back in specs ? what do you think ?

author: CapLeaker
author_rank: Regular Contributor
timestamp: July 14, 2023, 06:06:47 pm
content: Heat the board up to 40-50C with wifeys hair dryer and try again.
Washing OLED Screens in IPA? - Page 1
Forum section: electronics / repair

author: dexters_lab
author_rank: Unknown
timestamp: May 28, 2019, 09:36:00 am
content: I am fixing up this SMOK e-cig/vaporizer that's been sat in vape juice to the point the buttons don't operate properly, the whole thing is covered in the stuff, i was going to wash it all in IPA with the screen removed but it's heat-staked to the PCBare OLED screens safe to immerse in IPA?

author: Yansi
author_rank: Super Contributor
timestamp: May 28, 2019, 09:37:40 am
content: I'd say that none such display technology shall be immersed in solvents.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 28, 2019, 10:41:47 am
content: I would try to seal it off in a zip lock bag and block the remaining hole(s) the IPA will try to penetrate the display layers, and may take a long (or very long) time to dry, it may leave some residues in the said layers by displacing dust, contaminants etc ...

author: dexters_lab
author_rank: Unknown
timestamp: May 28, 2019, 11:56:38 am
content: thanksafter posting i realised the heat stakes weren't really doing much and was easy to pop the screen off but the flat flex connection was glued/hot-bar attached to the pcb, but it did allow me to move the screen out of the way enough to wash down the pcbit's back together and seems to be working properly nowthey are fiddly buggers to take apart and get back together with three connections that require soldering during the process, with springs and fiddly parts, given the cost of these it's almost not worth repairing them FYI