hybridfree/eevblog-posts huggingface dataset:
Sartorius Ge 512 0ce will not turn on - Page 1
Forum section: electronics / repair

author: Keno1981
author_rank: Contributor
timestamp: June 09, 2024, 02:52:25 am
content: i just got a used balance of sartorius GE51- 0ce model but it will not turn on when i push the on button. before shipping it was ok. any help is welcome. thanks

author: tunk
author_rank: Super Contributor
timestamp: June 09, 2024, 10:42:03 am
content: Open it and see if there's anything obvious like loose wires or connectors.Does the PSU deliver the correct voltages?

author: Overspeed
author_rank: Frequent Contributor
timestamp: June 09, 2024, 11:27:12 am
content: Helloopen and check with a multimer IF yes or no the PSU worksRegardsOS

author: Laval
author_rank: Regular Contributor
timestamp: June 09, 2024, 11:50:37 am
content: Also, check if there is a fuse that might be blown. You may have to open it to do that.

author: ratmole
author_rank: Contributor
timestamp: October 17, 2024, 12:58:45 pm
content: Hi,there is a transistor on the top right corner marked as AH-16. Most likely it's defective.Try to short the Collector-Emitter and see if the unit power on. If yes, change the transistor and you are good to go.if i'm not mistaken here is the datasheet :https://www.onsemi.com/download/data-sheet/pdf/bcp53t1-d.pdf
SB1040 3-pin rectifier (substitutes?) - Page 1
Forum section: electronics / repair

author: 13hm13
author_rank: Frequent Contributor
timestamp: May 31, 2019, 10:38:28 pm
content: I have a 5V (3amp) wallwart adapter that seems to have blown its SB1040.It's a 3-pin device with the CENTER pin not used (cut out)From the pic, note how the didoes are facing each other.I don't have any 3-pin devices like thin in my bin, but I have plenty of std. didoesBecause all pins show short (0 ohms) with respect to each other (defect), I'm not sure that center pin is connected to ground. The heatsink is soldered to ground on the PCB.Thx!

author: Yansi
author_rank: Super Contributor
timestamp: May 31, 2019, 10:44:16 pm
content: Switchmode or linear wallwart? From the rating (3A 5V) guessing it is a modern switchmode adapter.Don't mess with neither of those, unless properly trained and very aware of what ya doing there!The center pin is definitely connected to the heatsink tab and more than likely it won't be connected to ground, but +5Vout.Whats the problem obtaining (buying) a replacement diode? These should cost just pennies, "1040" schottky diodes are more than abundant, can be even salvaged from an old beaten PC power supply.

author: 13hm13
author_rank: Frequent Contributor
timestamp: May 31, 2019, 10:57:15 pm
content: Thx for the feedback.Actually, the issue is resolved as there was another problem with 120v socket (power) strip. Doh!Yes, its SMPSU from company KEIC. Nice construction on the inside ... layout, parts quality, etc. Very handy for SBC and portable HDDs.The nearest electronics store is 5 miles away. I'm sure they'd have a cheap replacement. But I'm not regular repairer so a bit of hassle.
sc100 water circulator screen repair - Page 1
Forum section: electronics / repair

author: rc100f
author_rank: Newbie
timestamp: October 24, 2020, 05:27:04 pm
content: Hello, I have a sc100 water circulator whose lcd screen is broken (more specifically the ribbon cable connection is broken). I dont think I would be able to repair it so I'm looking for a replacement. However it seems like it's an old obscure part from which the only reference I found is a datasheet from 2011 (http://www.believe.it/p.asp?p=YMC12864-286AAABDGL). So I was wondering if you guys would know of any other screen with a similar pinout.Thanks for your help

author: coromonadalix
author_rank: Super Contributor
timestamp: October 25, 2020, 01:36:29 am
content: I think its this one instead, the other has a standard pinout, not a flex cablehttp://www.believe.it/p.asp?p=YMC12864-286ACBBDGL
Schadow NE15 (HP) power switch replacement or alternative.  - Page 1
Forum section: electronics / repair

author: bd139
author_rank: Super Contributor
timestamp: August 30, 2019, 11:44:06 am
content: I am trying to locate a Schadow NE15 switch or equivalent. It’s a latching changeover DPST/DPDT switch as used in lots of HP equipment (1740A/3478A at least). If anyone knows of a suitable alternative I’d appreciate it.I looked at NE18 switches and none of them will fit the tie bar footprint.

author: bd139
author_rank: Super Contributor
timestamp: August 30, 2019, 01:18:08 pm
content: Found one eventually:https://www.rapidonline.com/rvfm-pt-m3bl-pcb-power-switch-locking-dpst-m3-hole-78-0069

author: TERRA Operative
author_rank: Super Contributor
timestamp: August 06, 2022, 04:32:38 am
content: I needed one of these too and just found this thread.For the record, these parts should fit:Mouser: 'Well Buying' PT-S4PLDigikey: 'C&K' NE182UEE6AMP
Schaffner EMI receiver SCR3501 SCR3502 memory card copy - Page 1
Forum section: electronics / repair

author: piotekp90
author_rank: Contributor
timestamp: February 15, 2024, 11:53:56 am
content: Does anyone have a copy of the memory card from the SCR3501 or SCR3502 EMI analyzer?I, unfortunately, did not replace the battery in my SCR3501 in time and the data on the card has been erased, so the analyzer does not work

author: MaxH
author_rank: Contributor
timestamp: January 17, 2025, 05:53:44 pm
content: Pushing this topic because I ran into the same problem. I also cant do proper sweeps or scans because it says "PC-Card mismatch, change or calibrate", I have only a few kb of space available and it wont detect the space of the memory card, i also already tried it additionally with another SRAM card (512kb)Does anybody own one of those receivers? for example SCR3501 SCR3502 SCR3511 SCR3512I was also unable to find a manual or the software.I can connect to it via RS232 but dont have any commands available except the classical *IDN?Does anybody have further resources about this receiver?Thanks in advance!

author: Golds
author_rank: Contributor
timestamp: August 24, 2025, 09:39:47 am
content: I have a 3512. I don't have a power supply, and I don't know the definition of the slot. With one of the channels 12 Vdc at will, it starts and stays on the interface of the second photo, and cannot enter the home page. I don't know how to help you, because I can't help it...
Scheiber switch panel failure - Page 1
Forum section: electronics / repair

author: Aurelio
author_rank: Contributor
timestamp: November 13, 2024, 04:01:17 pm
content: Dear members,i have here on my desk a Scheiber switchpanel 41.960011.00. I've received this from a colleague with the description that it does switch any relays on anymore.I'll update with some pictures later tonight.When powered, all the leds on the panel go on and they all blink very short every 2sec approximately. I've measured all voltages wich are ok and tried to measure around a bit but without a schematic it is shooting in the dark.The board has an STM32 micro onboard and seems to use shiftregisters to control the leds.Can anyone point me in some direction? Someone who experienced this already or can provide me with a schematic?Thx!
Schematic: Apple Cinema Display 30-inch LogicBoard mainboard LAQ55C EAX35328201 - Page 1
Forum section: electronics / repair

author: EEV_TechForum_drb
author_rank: Newbie
timestamp: July 21, 2022, 11:58:09 pm
content: Any documentation such as schematic, boardview, service manuals would help.Mahalops: Additional InfoBarCodes on MLB:SilkScreen on MLB:
schematic diagram for multitester t7 chinese model - Page 1
Forum section: electronics / repair

author: eniestar
author_rank: Newbie
timestamp: June 10, 2021, 05:05:11 pm
content: good afternoonif anyone has a schematic digramm for the chinese multitester t7 because it want work when i put the cherger the led is green and he don't want charge the battery any help please?
Schematic for Amazon Basic (Aurora) 12 Sheet shredder - Page 1
Forum section: electronics / repair

author: lunacyworks
author_rank: Contributor
timestamp: January 05, 2022, 04:12:42 am
content: I am looking for a schematic for an Amazon Basic 12 Sheet shredder.If one is not available is there a recommended way to convert the photos into an schematic?The shredder is having what appears to be IR issues, and I wanted to understand the circuit before attempting a further repair. All board level components have been tested good (Resisters, Relay, Diodes, Caps) The only items not tested were the Transistors.I have included picturesAmazon B00D7H8XB6 [https://www.aurora-europe.co.uk/spec_as1236c.html]

author: amyk
author_rank: Super Contributor
timestamp: January 05, 2022, 10:44:20 am
content: Trace it out. It's a single-sided board.

author: lunacyworks
author_rank: Contributor
timestamp: January 06, 2022, 05:55:14 am
content: I am tracing it out but would like to use a software package to do it as practice, wondering what others are using. Of course this is to aid in the actual repair of the unit.

author: IanB
author_rank: Super Contributor
timestamp: January 06, 2022, 06:01:29 am
content: I would probably do it using DaveCAD™ (pencil and paper) in the first instance, and transcribe it later to software if needed.
Schematic for Farnell TM39 Microvoltmeter - Page 1
Forum section: electronics / repair

author: WaveyDipole
author_rank: Frequent Contributor
timestamp: June 27, 2019, 08:17:49 pm
content: Does anyone have a copy of the schematic for a Farnell TM39 Microvoltmeter or know where I might be able to find one? I have searched the more prominent online sources but so far found information only the TM2 and TM6. The TM2 circuit seems to have at least some similarities with the TM39, and while it has been somewhat helpful in identifying the manufacturers general approach to the design of the circuit, the actual details of components and their references differ. It would be ideal to have the TM39 diagram to aid troubleshooting.
Schematic for Instek PSP-2010 Power Supply? - Page 1
Forum section: electronics / repair

author: larrybud
author_rank: Contributor
timestamp: December 18, 2024, 01:43:26 pm
content: I bought this non-working Instek PSP-2010 power supply off ebay and can't find any schematic for it, anybody have one?Do you guys have a go-to site for schematics?Observationally I found two bad caps (way out of range and one with super high ESR), so waiting on replacements for those! Hopefully that's all that is wrong.

author: Wollvieh
author_rank: Contributor
timestamp: December 18, 2024, 03:17:10 pm
content: With a search on PSP 2010 you'll find a lot of threads here.For example that one where I added most likely matching schematics:https://www.eevblog.com/forum/repair/a-gw-instek-psp-405-lab-bench-power-supply-repaired/msg2894848/#msg2894848The caps going bad in this model is well known and the repair already documented here.That power supply comes under many names and in variations of voltage and current, which changes the prefixes and numbers the sellers use. ISP, PSP, 2010, 405, 603 etc. All same same, but different.

author: larrybud
author_rank: Contributor
timestamp: December 18, 2024, 09:06:40 pm
content: Thanks. For some reason my search didn't come back with anything.
Schematic for Keithley 238 - Page 1
Forum section: electronics / repair

author: derZockerMP
author_rank: Regular Contributor
timestamp: May 29, 2024, 03:04:55 pm
content: Hallo, does anyone have the schematics of the Keithley 238?Or is it still unavaiable?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 29, 2024, 04:59:18 pm
content: problems with it ? calibration ?Find more on X'devs ... free registrationsorry no schematics , you may have already find out this one, but you have theory of operations and part numbers

author: coromonadalix
author_rank: Super Contributor
timestamp: May 29, 2024, 05:04:16 pm
content: the 2 ive found so far and 88 pages earlier post and this 104 pagesFind more on X'devs ... free registrationand the 236 237 and 238 share some basics314 pages operator manualhttps://elektrotanya.com/keithley_236_237_238_source_measure_units_usr._1989-2000_sm.pdf/download.html#dland some threads herehttps://www.eevblog.com/forum/metrology/calibrating-keithley-237-(236238)/https://www.eevblog.com/forum/testgear/keitley-238-restoration/

author: derZockerMP
author_rank: Regular Contributor
timestamp: May 29, 2024, 05:58:37 pm
content: Ok thanks. On xdevs Im already registert. I would like to build my own SMU with an 1A version so the output stage would be intresting

author: coromonadalix
author_rank: Super Contributor
timestamp: May 30, 2024, 02:05:30 am
content: but you have smu projects here ??
Schematic for shark SV780N - Page 1
Forum section: electronics / repair

author: Carl E
author_rank: Regular Contributor
timestamp: January 26, 2025, 06:30:56 pm
content: Does anyone have a schematic for a Shark SV780N? This hand vac turns on sporadically for about a second then shuts off. It sometimes runs normally but sometimes shuts down while running as well. I've changed out the Mosfet IRLR8726, no change in the problem. I've inspected the solder joints, used different 18v supplys to no avail. For such a small board it is kicking my butt. Thanks in advance. Carl
Schematic for TDS684 - Page 1
Forum section: electronics / repair

author: whatboy
author_rank: Regular Contributor
timestamp: January 02, 2022, 12:53:26 am
content: Is there an schematic fior TDS684C??? think I might have some problems with one TDS684C. it won't boot, just hangs after logo and black screen, If I disconect the HDD, it will hang with a clock!!!Thought it was a damaged pad on the dallas, but I check almost all pins, minus INTA and INTB from DS1486, they seem to go no where!

author: whatboy
author_rank: Regular Contributor
timestamp: January 02, 2022, 03:22:51 am
content: Nevermind, It is the HDD, it is weird, I took it out of the scope, and put it on the PC, and It did read it, copy all info on my C:/ drive... but put it back, and the scope won't boot with it, put it again on the PC, and nothing... the HDD was gone, it sucks, because the Tektronix logo was on the HDD, now it just doesn't show up the logo!!! bummer!!! but at least my scope is good again!
Schematic help!!! - Page 1
Forum section: electronics / repair

author: Crambone
author_rank: Frequent Contributor
timestamp: July 12, 2024, 09:49:07 pm
content: Can anyone tell me where the 26VDC starts and the path it takes by looking at this Power Supply Schematic?Thanks, Andrew

author: Harry_22
author_rank: Frequent Contributor
timestamp: July 12, 2024, 10:05:39 pm
content: Your PS has PFC circuit. 26 volts takes from U2 T2. This is some kind of standby voltage.

author: asis
author_rank: Frequent Contributor
timestamp: July 13, 2024, 12:52:42 am
content: Hi,Apparently this is the PS RPS-1500-xx MEAN WELL line.U7 (pin2, J2_2) gives +5V SB.T3 (TIP122 Darlington) forms from +26V -> +13V to power the drivers U9 & U10 [Vcc 3] (UCC27424 s) of the inverter itself Q13;Q14;Q15;Q16 and has a switching circuit (HV-ON) Q11;Q12 that controls PWM module (PCB1 DC1500_CNTRL_BORD).Q17; SCR1 & ZD1 - OVP.It would be interesting to see the diagrams of the PFC & PWM modules themselves.

author: Kim Christensen
author_rank: Super Contributor
timestamp: July 13, 2024, 12:57:39 am
content: Don't start multiple threads on the same topic! I already told you this inthe other thread.
Schematic HP Agilent 54810-66505 video board - Page 1
Forum section: electronics / repair

author: GGMM
author_rank: Frequent Contributor
timestamp: March 25, 2025, 09:33:18 am
content: Hello,It may be a wishful thinking, I search for the electronic schematic of the HP Agilent video card 54810-66505 to repair it (Or equivalent 66525)If you have that, I’m a taker.Thank you

author: coromonadalix
author_rank: Super Contributor
timestamp: March 25, 2025, 02:10:31 pm
content: https://www.ebay.com/itm/145561549556that one ??you have at least 2 lower priced, from Israel

author: GGMM
author_rank: Frequent Contributor
timestamp: March 25, 2025, 05:38:36 pm
content: Coromonadalix,I know it exists on Ebay.I have unsoldered the chip’s 65550 and I am waiting to receive it. (only 10€)I’m pretty sure it’s defective and blocks the motherboard bus.The scheme was to understand how it works.This 208-leg chip was not so difficult to unsolder.cdt

author: coromonadalix
author_rank: Super Contributor
timestamp: March 25, 2025, 07:50:50 pm
content: yeah i figured you would you best chances are finding references designs or any datasheets as you already knowhttps://ia904509.us.archive.org/26/items/bitsavers_chipsAndTe_3946729/CHIPS_65550_199710.pdfhttps://copleyservices.com/DK65555X-PCI_PC_Board_Design_ug168_1.pdf

author: GGMM
author_rank: Frequent Contributor
timestamp: April 02, 2025, 04:21:25 pm
content: CoromonadalixI did several tests by putting the video card 54810-66505 in the PCI bus, knowing that the graphics chip 65550 is unsoldered.There is no problem starting the motherboard.As the 65550 chip is connected to the bus via the PCI connector, it would seem that this one must be defective and blocked the whole. (To be verified)Note that on this video card the memory and bios are connected to the internal bus of the 65550, so not directly on the motherboard.Normally, I should receive chips 65550 tomorrow, once welded we’ll see.cdt
Schematic Needed AEM 6501 Preamp - Page 1
Forum section: electronics / repair

author: connectTek
author_rank: Regular Contributor
timestamp: December 13, 2019, 09:31:47 pm
content: I am in need of a Schematic and, if possible the whole article of the AEM 6501 Preamp.This was a Project in an Australian Magazine, Australian Electronics Monthly.Also, if Possible, a schematic for the ETI 480 Amplifier.ThanksHave search the Net but no luck.

author: fzabkar
author_rank: Super Contributor
timestamp: December 15, 2019, 02:15:38 am
content: solaris.no/electronics/power_amp/ETI480/ETI480_theory.pdf(tech info)https://www.vkham.com/resources/kits-manuals/dse-kit-information(Dick Smith ETI 480 kit)
Schematic needed for SMPS Mean Well PT-45 - Page 1
Forum section: electronics / repair

author: RoGeorge
author_rank: Super Contributor
timestamp: March 17, 2022, 03:24:55 pm
content: I have a few Meanwell PT-45B triple output power supplies (mains 90-220V AC to 5/12V 45W DC) left from another project, and I would like to modify them for other projects and other output voltages. So far I could only find a block diagram and the specs:https://www.meanwell.com/productPdf.aspx?i=660#1Can anybody help me with a schematic for this model, please?

author: tunk
author_rank: Super Contributor
timestamp: March 17, 2022, 03:40:26 pm
content: No expert on this, but following other threads I think it's been said thatyou may adjust SMPSs up to +/-20%. For more than that you may haveto rewind the transformer etc. Some photos may also help.

author: RoGeorge
author_rank: Super Contributor
timestamp: March 17, 2022, 04:31:43 pm
content: Found so far a schematic for PT-65. Components arrangement on the PCB looks identical with PT-45. I didn't check the parts values yet, but I guess it's the same schematic used for 65W instead of 45:https://radioskot.ru/forum/3-6666-1
Schematics / circuits for Bose AWRCC5 or AWRCC6 - Page 1
Forum section: electronics / repair

author: steveod21
author_rank: Newbie
timestamp: December 23, 2017, 10:56:53 am
content: Hello allI have a Bose AWRCC6 which almost works! If I can explain, the display seems good and in many ways the beast responds to the remote. Volume, clock, alarm all respond, but I get the fail message 'Please Wait' when I try to actually switch on and get it to play some music for me. This I gather is indicative of some or other hardware failure but having repaired many of the earlier AWRC3x (lift up CD lid model) I'd like to repair this too.Does anyone have circuits for the Bose AWRCC5 or AWRCC6 I could see? By way of a trade, if it helps, I have some circuits for the earlier model. I'd be grateful for any support I can get though.Thanks allSteve

author: horo
author_rank: Regular Contributor
timestamp: January 18, 2020, 04:58:12 pm
content: Hi Steve, hi all,I have a BoseAWRCC4with slide-in CD on my desk that behaves exactly as you described. Setting the correct time works fine, also setting the alarm. The time advances and as soon as the alarm triggers the time falls back to 12:00 and it shows 'Please Wait'.Unfortunately I can't find a schematic or a repair manual either.Martin

author: envisionelec
author_rank: Frequent Contributor
timestamp: January 22, 2020, 04:36:09 pm
content: I have repaired a few of these (without schematics) and I seem to recall there is a standby 5V or 7.5V supply that fails and prevents some circuitry from functioning. It's not a complex device inside so I encourage you to "take it apart" with a nearby computer ready to look at some datasheets and do some troubleshooting.

author: horo
author_rank: Regular Contributor
timestamp: January 24, 2020, 02:17:09 pm
content: The failure mode is the same as shown on youtube, have found two suspicious electrolytic capacitors so far, but the repair is not yet 100% reliable.I will exchange a few more electrolytic capacitors.Martin

author: goaty
author_rank: Regular Contributor
timestamp: January 24, 2020, 05:28:59 pm
content: I have replaced most Caps on the AWRCC1 plus gave him a new CD drive, works very good but not perfect.I think I remember that replacing the Caps in the CD area helped most.

author: horo
author_rank: Regular Contributor
timestamp: February 02, 2020, 12:43:05 pm
content: Recapping done - it works again - my mother in law will be happyI replaced all capacitors on the processor board with 105°C low ESR types.Martin
Schematics for Hameg HM512-1 (HM512)? - Page 1
Forum section: electronics / repair

author: Greybeard
author_rank: Frequent Contributor
timestamp: February 22, 2025, 04:30:28 pm
content: I am looking for circuit diagrams for a Hameg HM512-1 (HM512) oscilloscope.This is the first version of the HM512 series and also the last with full tube configuration (without transistors).I have found circuit diagrams for HM512-2 and later, but these are completely different and already partially equipped with transistors.https://www.radiomuseum.org/r/hameg_oscilloscope_512.html#https://www.radiomuseum.org/images/radio/hameg_gmbh_frankfurt/oscilloscope_hm512_672960.jpg
Schematics for HP 54510A - Page 1
Forum section: electronics / repair

author: mwbarth36
author_rank: Regular Contributor
timestamp: May 03, 2020, 04:25:01 pm
content: Does anyone know if the circuit diagrams are available for the HP 54510A are available. Even something close in that series would help. I have not been able to locate them in my searching. Help will be greatly appreciated!
Schematics for isolation tester Metriso 500 VW?  - Page 1
Forum section: electronics / repair

author: nightfire
author_rank: Frequent Contributor
timestamp: June 12, 2022, 01:51:37 am
content: My recent akquistion is an isolation tester from the past, around 1980 I would guess:https://www.eevblog.com/forum/chat/what-did-you-buy-today-post-your-latest-purchase!/msg4230262/#msg4230262Another guy has made some better report and pics from his version:http://www.crowave.com/blog/2017/06/25/metriso-500-vw-bbc-metrawatt/Situation: The tester came quite complete in good condition to me, and as far I have measured its behaviour, it is in perfect working condition.This means, it could use some good cleaning, replacement of the rubber foam in the battery compartment that is actually getting sticky, and some Deoxit love for the contact surfaces of the probe tips is probably also no bad idea.On the inside there are some electrolytics and tantalums, that probably also would profit from some planned replacement- and now the trouble starts: In the manual (which doubles also as some sort of service manual) are some principal schematics inside, so that the user is able to really understand the way the device works, but no detailed schematics in which the caps etc. are present.So questions at this point:- Does anyone has some idea where to get the detailed schematics for the Metriso 500VW? Other versions sadly are not that similar in the internals...- Some proven tips to replace the sticky foamy thing in the battery compartment? Resp. with which stuff?- Any tips or caveats to look for when cleaning the probe tips from years of muck and possible traces of corrosion?

author: HighVoltage
author_rank: Super Contributor
timestamp: June 12, 2022, 07:05:03 am
content: It is very difficult to find any Metriso schematics on the internet.But these older instruments are relative easy and you can trace the tracks and make your own schematics for the area of interest,

author: nightfire
author_rank: Frequent Contributor
timestamp: June 12, 2022, 11:49:52 am
content: *Sigh* I see, that I am also probably out for some adventure, and this time I really had a look at the manual before buying it and was like "Hey- cool old stuff, where they provided some schematics"What I am afraid of the most, are the diodes of the push-through type, if they break or go bad...The rest seems pretty standard to me, maybe except the DC/DC converter stage where the 660VDC is generated.Other question: What reputation do old Roederstein capacitors have? From the looks of it, the big 1000µF cap is an old Roederstein, anyone with experience with them?

author: shakalnokturn
author_rank: Super Contributor
timestamp: June 14, 2022, 06:27:27 am
content: I doubt your 1mF capacitor is one but if you have any plastic encapsulation ROE radial elecyrolytics they're usually dry.
Schematic/SM or even block diagram/hints  for a Panasonic VP-8300A 2 GHz sig gen - Page 1
Forum section: electronics / repair

author: Microbit
author_rank: Newbie
timestamp: July 04, 2025, 02:55:39 am
content: I'm about to embark on fixing a Panasonic 2 GHz RF signal generator VP-8300A.It's low in output between 260 and 520 MHz, set at 0 dBM it typically outputs approx. -2 to -3 dBm and sometimes around -26 to -28 dBm.All other freqs to 2000 MHz output 0 dBm precisely, and on frequency.When entering or leaving the band 260-520 MHz you can clearly hear the "clack" of some sort of relay, coaxial I presume, swithcing a multiplier or amp or some such.Does anyone have any suggestions, reference material or previous exposure with this lovely signal generator?TIA73
Schlumberger / Solatron A211 Voltmeter technical manual - Page 1
Forum section: electronics / repair

author: wanderer404
author_rank: Newbie
timestamp: December 07, 2021, 04:45:17 am
content: Hello all,I'm about to embark on a repair of a Schlumberger / Solatron A211 Voltmeter. Does anyone happen to have access to a technical manual?Regards,Chris

author: shakalnokturn
author_rank: Super Contributor
timestamp: December 08, 2021, 06:06:04 am
content: No for the manual.I think Dave Partridge "perdrix" is one of the most Solartron involved people around, you may want to try on groups.io where I think he administrates a dedicated group.

author: wanderer404
author_rank: Newbie
timestamp: December 12, 2021, 07:05:04 am
content: Thanks, I've posted there as well.

author: perdrix
author_rank: Frequent Contributor
timestamp: December 12, 2021, 11:48:47 am
content: Who, me? You could try Telford Electronics for a hard copy operations manual (which at that vintage may even contain schematics).Dave

author: factory
author_rank: Super Contributor
timestamp: December 12, 2021, 01:49:16 pm
content: Unlikely as the manuals for this range of voltmeters seem to be separate operators (which cover a few variants) and separate technical manuals, which seem difficult to find, Telford have nothing for the A211 anyway.David

author: perdrix
author_rank: Frequent Contributor
timestamp: December 12, 2021, 04:04:41 pm
content: >Schlumberger A210/A211/A212/A213/A215/A230/A233/A235 Digital Voltmeters OperatorSo they do have the Ops Manual at least.
SCM Pannel Saw Computer XILIA X915 Rom contents needed. - Page 1
Forum section: electronics / repair

author: ratmole
author_rank: Contributor
timestamp: February 19, 2023, 03:01:27 pm
content: Hi, looking for the ROM contents of an old panel saw computer for a SCM Machine.The Computer model is XILIA X915, and the pcb board no is TX111A.The ROM chips are marked:GDT 0979, GDT 0980, GDT 0981GDT 0982, GDT 0983, GDT 0984If anyone has them please share!PS. If someone has the service manual for this machine, or a schematic for the board please let me know.Thanks.
Scope bright up bistable expected signal - Page 1
Forum section: electronics / repair

author: gkmaia
author_rank: Frequent Contributor
timestamp: February 11, 2020, 09:11:23 pm
content: Trying to repair an old Gould Os1100 scope.At the collector of TR706 should I expect just an amplification of the signal that comes from BU input 712, keeping the signal similar?Or should I expect some modulation added to the signal or any other changes apart from amplitude changes?
scopemeter PM95 - Page 1
Forum section: electronics / repair

author: david69
author_rank: Regular Contributor
timestamp: January 11, 2021, 08:40:18 am
content: Hello,Can I ask about battery charge protection circuit in PM95 ?The two 2SK974 should switch groud to battery before charging.There are switch off in Power OFF scopemeter?,The V2541 has emiter -8V and base,colector -7,5V against groud,V2543 has -7,3V on common pin... power supply is switched off.The battery pack is broken? There is 5,4VThanks

author: david69
author_rank: Regular Contributor
timestamp: January 13, 2021, 09:42:14 am
content: Hello,I have replaced all elyts on analog board. The charging battery is working.The supply is working. Chanel B is working, but chanel A + red banana isnot workingI have tried signal 1kHz/100mV Vpp to chanel A in scope mode, but onpoint TP207 no signal, there is switched on/off signal in meter AC option andwhen signal is connected to red banana, where I am looking for errors?Thanks ....

author: david69
author_rank: Regular Contributor
timestamp: January 13, 2021, 12:35:16 pm
content: The service point TP207 is active in SCOPE mode, when input signalon chanel A is about 1V Vpp but display shows no signal...

author: david69
author_rank: Regular Contributor
timestamp: January 13, 2021, 04:37:06 pm
content: The test points both analog/digital are ?OK? any strange, scopemeter works partly in scope mode on chanel B, but during operation freeze"Instrument must be reset" .....Do You think that flash is broken? There are some firmwares for PM95??or RAM?? etc...

author: david69
author_rank: Regular Contributor
timestamp: January 14, 2021, 07:38:54 am
content: The SET AUTOMATIC SCOPE function is not working

author: david69
author_rank: Regular Contributor
timestamp: January 14, 2021, 03:59:57 pm
content: display shows signal connect to channel B, but there is switched channel A,Hybrid OQ0308 ??

author: david69
author_rank: Regular Contributor
timestamp: January 15, 2021, 06:26:25 am
content: I will replace all analog switch 4316 in Attenuators and see?

author: david69
author_rank: Regular Contributor
timestamp: March 12, 2021, 03:39:16 pm
content: good news, point TP107 and TP207 has same signal, AD converts data on bothchanel A and B, but display still shows only signal in chanel Band scopemeter doesn`t work, resistance shows 6 Ohm with opened input? butpulses are changed by variable resistor, digital control board has broken firmware?Or Where is fault? Thanks David

author: david69
author_rank: Regular Contributor
timestamp: March 13, 2021, 01:36:05 pm
content: Signal CHANA is missing behind R1232 parallel with C1222 on pin 13 of OQ00308Signal processor is working, I have tried change capacity from 120pF to 1nF withoutefect...
Scotter controller not turn on - what component is this? - Page 1
Forum section: electronics / repair

author: eduaqa
author_rank: Contributor
timestamp: May 28, 2025, 10:43:33 am
content: I have this board from a scoter it's not turn on.With 36v on the battery PINs, it don't power the microcontrollerI'm focusing on the power/regulator portionOn the component marked it has 8 pins and I noted some pins that I could identify as well the label on the topthose notes are from pin 1 to 4Any tip?

author: eduaqa
author_rank: Contributor
timestamp: May 28, 2025, 10:44:43 am
content: Here is the correct picture

author: eduaqa
author_rank: Contributor
timestamp: May 29, 2025, 11:47:28 am
content: Seems that the schematic is like this

author: BILLPOD
author_rank: Frequent Contributor
timestamp: May 29, 2025, 01:17:04 pm
content: Good Morning Edaqua, Google doesn't know what a 'Scotter' is, but it says 'Scoter' is astocky seaduck.

author: wraper
author_rank: Unknown
timestamp: May 29, 2025, 01:23:28 pm
content: It's a buck converter IC, pin 6 should be connected to GND

author: fzabkar
author_rank: Super Contributor
timestamp: May 29, 2025, 05:06:34 pm
content: SY8502FCC, Silergy, High Efficiency, 1.2A Continuous, 1.8A Peak, 85V Input, Synchronous Step Down Regulator, marking BDXxyz, SO8E:https://xonstorage.blob.core.windows.net/pdf/silergy_sy8502fcc_apr22_xonlink.pdf
Screen printing inquiry for help - Page 1
Forum section: electronics / repair

author: 晓看风云
author_rank: Contributor
timestamp: April 14, 2024, 02:26:56 am
content: Sincere greetings to everyone, thank you for checking this message. I have a chip in a 6-pin package with silk screen printing for 00TV that needs to be recognized. I have searched many places but found nothing. The picture already shows all the information I know. I urgently need everyone's help, and once again, my sincere greetings!

author: amyk
author_rank: Super Contributor
timestamp: April 14, 2024, 03:02:11 am
content: PIC10F200-I/OT

author: 晓看风云
author_rank: Contributor
timestamp: April 14, 2024, 09:08:16 am
content: Thank you very much for your reply. In fact, I have already checked this chip yesterday. But yesterday I confused the positioning of the power and ground, which caused me to overlook it. Today you mentioned it again, and I carefully compared it and confirmed that it is it. Thank you! Also, I would like to ask if I can expect it to work properly if I simply replace it with a brand new one without programming it?

author: Ian.M
author_rank: Super Contributor
timestamp: April 14, 2024, 09:35:49 am
content: No. A new PIC will do absolutely nothing until it is programmed. Usually in commercial products the security bits(s) in the chip's Config are enabled, making it impossible to recover the program to clone the chip.

author: 晓看风云
author_rank: Contributor
timestamp: April 14, 2024, 01:39:27 pm
content: Quote from: Ian.M on April 14, 2024, 09:35:49 amThank you very much for your answer! I found through searching the circuit that pin 1 of pic10f200 is the pin for controlling the power indicator light, but the indicator light is not installed, so you don't need to worry about this pin. The truly effective pin is pin 6, which is at a high 5V level. Pressing the power soft button will pull it down. This triggers the high and low logic level conversion of pin 3, completing the command to turn on or off! It's very simple! Do you know if there is any chip that does not require programming to replace it? Do you have any good ideas? I have never been exposed to programming before

author: amyk
author_rank: Super Contributor
timestamp: April 15, 2024, 12:09:06 am
content: That doesn't seem like a very complex function. It would be a good opportunity to learn programming as you won't need much code for that.

author: 晓看风云
author_rank: Contributor
timestamp: April 17, 2024, 01:15:22 pm
content: Quote from: amyk on April 15, 2024, 12:09:06 amThank you very much for your help! I don't seem to need the code anymore. I found a problem with poor button contact. I ignored it because I could lower the voltage at the beginning! Just a cunning fox 🦊
Screen to Fluke 77 -IV - Page 1
Forum section: electronics / repair

author: a.ekholm
author_rank: Contributor
timestamp: March 24, 2021, 08:04:19 am
content: Hi!I have trouble finding a screen to a fluke 77 -IV. Can someone please help me. (I live in Sweden, so it is nesesary for shipping)

author: coromonadalix
author_rank: Super Contributor
timestamp: March 24, 2021, 10:19:25 am
content: are you searching for the clear windows plastcic or the lcd screen ?
ScreenBeam or Actiontec ECB7250 Power Input Failures - Page 1
Forum section: electronics / repair

author: David Hess
author_rank: Super Contributor
timestamp: April 11, 2025, 07:58:44 pm
content: We had several of these fail recently, and with nothing to lose, I pulled one part.It appears that the SOT-23-5 part labeled ABF2L failed short with overvoltage on the DC input. The part next to it is an unmarked ceramic 4 ball grid array, maybe a diode? It looks to me like any input protection was removed from the design.I came up empty trying to find any matches for the ABF2L. Does anybody have any ideas?

author: David Hess
author_rank: Super Contributor
timestamp: April 22, 2025, 09:32:51 pm
content: I ended up replacing my failed ECB7250 with an Asus MA-25 after discovering that other MOCA adapters accept 12 volts rather than 5 volts, making battery backup easier.Examination of the ScreenBeam or Actiontec ECB7250 circuit board makes me suspect that either the design was originally 12 volts, and they converted it to 5 volts with no overvoltage protection, or it was always the cheapest possible design for 5 volts with no overvoltage protection.

author: m k
author_rank: Super Contributor
timestamp: May 01, 2025, 12:57:31 pm
content: Maybe protection is the missing square before pin 4.Are those circled dots connections through the board?

author: David Hess
author_rank: Super Contributor
timestamp: May 01, 2025, 01:50:15 pm
content: Quote from: m k on May 01, 2025, 12:57:31 pmThat could have been for shunt protection.QuoteYes.
SDG1025 Damaged CH1 Repair - Page 1
Forum section: electronics / repair

author: hesam.moshiri
author_rank: Regular Contributor
timestamp: November 18, 2024, 05:12:23 pm
content: I'm trying to repair my Siglent SDG1025 function generator which has damaged CH1. CH2 works properly.I replaced two components (U19 and Q3=BAV99) but channel one shows a weird waveform.U19 = THS3095 is a special OpAmp that can be turned ON-OFF via its PIN-8. so it's likely that it's OFF.I spent a lot of time, but I could not find a trace connecting to PIN-8 of U19. I can see a tiny track and a VIA on the PCB connected to PIN-8, but it goes from mid-layers to somewhere unknown.if somebody has this device please check the voltage on PIN-8 of U19, when channel-1 is active and Vpp is above 2 volts.

author: fzabkar
author_rank: Super Contributor
timestamp: November 18, 2024, 08:07:28 pm
content: https://www.ti.com/lit/ds/symlink/ths3091.pdf(datasheet)As I see it, you need to compare the PD* voltage on pin #8 against the REF voltage on pin #1.

author: hesam.moshiri
author_rank: Regular Contributor
timestamp: November 18, 2024, 08:40:24 pm
content: Quote from: fzabkar on November 18, 2024, 08:07:28 pmREF (Pin-1) is grounded, so I'm looking for the PIN-8 connection on the board. The voltage on Pin-8 is low (max 0.4V)

author: fzabkar
author_rank: Super Contributor
timestamp: November 18, 2024, 11:54:44 pm
content: Are you able to trace pin-8 of the working channel back to its source?

author: hesam.moshiri
author_rank: Regular Contributor
timestamp: November 19, 2024, 07:37:51 am
content: Quote from: fzabkar on November 18, 2024, 11:54:44 pmfor sure if it was designed like that, I was spotting it. This opamp is only used for CH-1

author: tautech
author_rank: Super Contributor
timestamp: November 21, 2024, 11:04:43 pm
content: Lots of info about these here:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/
SDG830 Siglent Arbitrary Function Generator frozen on logo screen - Page 1
Forum section: electronics / repair

author: prydien
author_rank: Newbie
timestamp: December 09, 2024, 11:15:41 am
content: HiNew to the forum. I see some people have had success with this issue so hoping I can fix it too.My SDG830 Siglent Arbitrary Function Generator has frozen on the logo screen with all the buttons lit up but not functioning. I can't update the firmware from the usb port because the buttons don't work.It hasn't been used for about 6 months but worked fine before that. Any help would be greatly appreciated.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 09, 2024, 12:46:36 pm
content: Ask Tautech member send him a PM ...
SDRPlay RSPDuo repair and component ID - Page 1
Forum section: electronics / repair

author: CRC
author_rank: Contributor
timestamp: January 15, 2025, 03:43:41 pm
content: I have an SDRPlay RSPDuo receiver that was damaged during an electrical storm. Nothing happens when it's plugged in. Under thermal I see a Diodes Inc. SOT-23 ULDO regulator marked GH4 next to the USB port and another six pin very low outline device marked 06H over L12 near the edge of the board, both are getting hot and the main 5v USB input rail is shorted directly to ground according to continuity testing.I'm trying to identify what the 06H over L12 marked component is. I think it's a voltage monitor but I'm not sure.Here is the other one.I just remembered there is one other component farther out on the board that is getting warm but I forgot to get a picture of it. I will add it later. I expected to see one of the main receiver chips getting warm or a capacitor shorted or similar but I don't I removed the 3 pin part and tested continuity but the 5v USB rail is still shorted. I will try to remove the 6 pin next and check but something is really clamping to ground.

author: Harry_22
author_rank: Frequent Contributor
timestamp: January 15, 2025, 07:39:50 pm
content: Hi!= APL3512AQB or APL3512BQB - power-distribution switchDifference is in the Logic Level Enable InputAPL3512A: Active HighAPL3512B: Active Low = AP2210N-3.0TRG1 - 300mA ULDO regulator. Fixed Output 3.0V

author: CRC
author_rank: Contributor
timestamp: January 15, 2025, 08:31:52 pm
content: Thank you!
Siglent SDS1104x-e intermittent glitches, then dead, now brought back to life - Page 1
Forum section: electronics / repair

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: July 23, 2022, 07:03:23 pm
content: I have an SDS1104X-E that has always been kind of glitchy and sometimes would freeze. Other times it would get stuck on boot and I used the USB recovery stick to fix it. Now the recovery method doesn't work, it tries to read the USB, but then has a little relay click, all lights flash on and it gets stuck.So I opened it up and started checking voltage test points. The +5V volt was not working, the one controlled by TPS7A4501, and the solder around the regulator looks discolored. I checked, the 5 volt rail is a dead short (0.1 Ohm). I already unsoldered the capacitors right next to it, but that wasn't the problem.Any suggestions for other places I should look for a short?

author: tautech
author_rank: Super Contributor
timestamp: July 24, 2022, 05:38:57 am
content: Oh yep that would do it.Subbed while you work on a repair.You give this unit for learning rather than take it for the warranty repair you’re entitled to.

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: August 06, 2022, 07:15:23 pm
content: Nah, never used a warranty for anything!Found a short in a tiny capacitor (CA43 in the picture, inside CH1 shield). Applied 0.1A to the 5V circuit and measured the voltage in various places on the board until found the lowest voltage that is still near positive rail (which was around 20 mV). For this it is helpful to put a 1 kOhm resistor across voltmeter leads, so readings are more stable. Then verified the component by putting a little drop of isopropyl on it and watching the voltage change. Without that capacitor the scope starts just fine. My guess is that the faulty capacitor and the 5V regulator have been fighting a tug of war until the capacitor won.

author: tautech
author_rank: Super Contributor
timestamp: August 06, 2022, 09:21:48 pm
content: Very cool find, good work !Hopefully I'll have the exact cap specs for you in a few days.

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: August 06, 2022, 11:01:48 pm
content: Thanks. It's probably a 0.1uF bypass capacitor for ADA4932 ADC driver. But I wouldn't try to put another one in, had a hard enough time getting it out. At least with a cursory check the transient behavior of CH1 does not seem to be any different from other channels.

author: tautech
author_rank: Super Contributor
timestamp: August 15, 2022, 08:25:06 pm
content: Quote from: maxwell3e10 on August 06, 2022, 11:01:48 pmYep seems so.From Siglent records:Package 0402, capacity 100nF, withstand voltage 16V, material X7R
sds2000x plus display scrambled - Page 1
Forum section: electronics / repair

author: zerto
author_rank: Contributor
timestamp: April 08, 2024, 09:50:59 am
content: Hello,I was doing some simple measurement when the display of my sds2104x plus got scrambled. I think it did happen in the past and rebooting the unit was enough to recover but today this is not the case, see the initial boot, I tried several times and at some point the siglent logo was ok and then the display got scrambled. It could be a software issue because SCPI is still working. I tried *RST and REC:FDEF but this does not fix the issue.What do you think ? is there other things I should try ?

author: zerto
author_rank: Contributor
timestamp: April 08, 2024, 10:17:51 am
content: it's back !If I recall well: I deactivated the touch screen with the front panel button and tried a few button press (default button, clear sweeps button, no change) then the shutdown button and let the unit disconnected from power for more than 10 minutes.next boot was ok

author: tautech
author_rank: Super Contributor
timestamp: April 08, 2024, 10:34:58 am
content: Which firmware version please ?It could be a display cable issue but warranty would be my first call.I'll register this with Siglent HQ.

author: zerto
author_rank: Contributor
timestamp: April 08, 2024, 01:35:43 pm
content: Thank you for your message.The issue is still present less than 10 minutes after boot without any action from my side.The firmware at the time of my initial post was SDS2000X-Plus_V1.5.2R1_EN,upgraded now to SDS2000X-Plus_V1.5.2R3_EN but that does not fix the issue.The unit is not under warranty anymore. I will check the teardown and see if it is easy to verify the display cable.

author: zerto
author_rank: Contributor
timestamp: April 08, 2024, 06:38:37 pm
content: The hardware version is 02-04, unit is 3 years oldunit opened and cleaned with air flow.the 2 connectors on the main board have been gently moved to renew contacts.the unit is back to normal for now.

author: tautech
author_rank: Super Contributor
timestamp: April 09, 2024, 12:46:48 am
content: Quote from: zerto on April 08, 2024, 06:38:37 pmGood.Just received is this reply from HQ:Yes, this fault usually is the display problem. The cable(between mainboard to lcd display)/LCDI board/LCD display may caused the default. From the result of this customer, it is the cable loose.

author: zerto
author_rank: Contributor
timestamp: April 09, 2024, 08:40:59 am
content: Thank you for the explanation, everything is ok since yesterday
sds8102v - Page 1
Forum section: electronics / repair

author: Sergey61
author_rank: Newbie
timestamp: May 07, 2024, 10:20:33 pm
content: do you need a dump from ovon sds8102? Hello. The officials haven't responded for a month. the problem is that all controls, all power supplies do not work, and the signal from the buttons reaches the pls