hybridfree/eevblog-posts huggingface dataset:
Sick HP 8657A - Page 1
Forum section: electronics / repair

author: Zenwizard
author_rank: Regular Contributor
timestamp: February 25, 2024, 06:00:38 pm
content: I have an HP 8657A on the bench that is mostly working. All the RF functions are working as well as the internal modulation functions. It is the external mod functions that I need and seem to be out to lunch. Voltages are healthy when I hook up a function generator the Ext Low light will not extinguish and modulation start. No matter what kind of signal I put in the front end FM or AM. I have confirmed that I have modulation making it to TP8 on the A10 but this is where troubleshooting has ground to a hault. I have not been able to locate a schematic to trace things further. If anyone has a schematic or an idea of a common part that should be looked at I am looking to save this RF source. If not I might be on the look out for the B version.Zen

author: Swake
author_rank: Frequent Contributor
timestamp: February 25, 2024, 08:15:06 pm
content: Have downloaded the service manual for this device from Keysight. It contains the schematic for the A10 board. But title for that board is audio/power supply board. This does not match your description about RF modulation. Something is wrong, could you double check please.

author: Zenwizard
author_rank: Regular Contributor
timestamp: February 26, 2024, 02:53:43 am
content: Turns out this is an indication issue. The RF is being modulated just fine but the circuit that says there is enough signal for the modulation is contently saying signal low. It looks like i might need a front panel for this one. There is really only a block diagram of how the logic is laied out and it is serial date going up to the front display board.So the good news is the RF circuits are all good but I have a logic line that is stuck.Zen

author: Tony_G
author_rank: Super Contributor
timestamp: February 26, 2024, 03:24:45 am
content: I took a quick look at the manual on the Keysight website and I think Service Sheets 17 & 19 might be the schematics you're looking for.I highly recommend going over toArtekManualsand purchasing their high-quality scan of the manual - It will make your life way better.TonyG

author: CounterEMF
author_rank: Newbie
timestamp: February 27, 2024, 05:25:05 am
content: ZenwizardI have two of these units and was confronted with the same issue when I first obtained mine The odds are high that there's nothing wrong with your generator. On page 3-56 of the Operating Manual you'll find the proper input level to be 707 mVrms +/- 20 mV. Deviating beyond those will set the either the "LO EXT" or "HI EXT" annunciator lights. Careful level setting should solve your problem.
SIEMENS D1032 (GOULD 1602) scope repair - Page 1
Forum section: electronics / repair

author: minekod
author_rank: Newbie
timestamp: October 25, 2021, 09:41:27 am
content: Hi,I've managed to buy a not working Siemens D1032 (GOULD 1602) scope. Scope was completly dead. After checking voltages on PSU, I've found that +5V rail reads 6 volts. After some soldering, the rail went normal 5V and scope went kinda on. The power LED is lit, and "ON" LED on channel 1 is constantly blinking at 1 second interval. No more signs of life. CRT went on 2 times, for a few seconds, but there was only a dot visible. I've desoldered a leaky battery, few tracks were affected, but they look fine. Reseating all IC's didnt change nothing. MCU signals and quartz's look fine on a scope. Any idea what can I do/check next? Does anybody know what blinking ch1 "on" LED means? Im out of ideas.

author: Kleinstein
author_rank: Super Contributor
timestamp: October 25, 2021, 04:48:04 pm
content: A while ago I had a Gould 1604 for repair. It had some capacitors are the supply going bad In my case the worst offender was one behind a regulator that made the regulator oscillate.The CRT part needs some of the regulatored supplies. So if the voltage regulator part is not working correct, the CRT may not woke at all.The LED blinking at 1 Hz kind of shows that the CPU is likely still running.AFAIR there was quite some relay action and light show on the front LEDs when turned on with a dead battery or no valid contend.Overall the scope is pretty limited in BW (AFAIR some 7 MHz in DSO mode). So even if working as new it is a pretty limited scope and not really valuable.

author: Razvan_N
author_rank: Contributor
timestamp: April 01, 2024, 05:00:17 pm
content: Do you happen to have or know where to find the operating manual (PDF) for it?I found the service manual and schematic, but not the user's manual. Thank you!
Siemens EH601EB11/02 induction hob - Page 1
Forum section: electronics / repair

author: Timoteo
author_rank: Newbie
timestamp: September 03, 2024, 08:06:50 pm
content: Hi, I am trying to fix this device but had not so much luck.Have found in this forum and another place on the web some service manual and code error but not for this exact model.But none of schematics for my boards, in my case the hob does not turn on and it looks like a control board (YL202) problem.Have measured the 4 wires connector and it does have 24v and 5v the signal on lin I do not know what to expect...Can some one give me a hand?Thanks for your help.Best regards,Timóteo

author: Timoteo
author_rank: Newbie
timestamp: September 05, 2024, 10:01:50 am
content: I fixit it!will let the details so some other members can check also.After spend some time checking the board for default components.The problem was with the power rail line that was interrupted for half of the board...Some solder rework and nail polish from my wife and it works again.Thanks for your time.Timóteo
Siemens EH675LDC1E (induction hod) - Page 1
Forum section: electronics / repair

author: emimad
author_rank: Newbie
timestamp: May 30, 2022, 11:43:07 am
content: Hi all!I've having problems with my induction hod since few months. It's a random issue so that it's difficult to diagnose it.In a normal operation use, the hod suddenly starts beeping and all the displays flashes without any error code, only the power level number selected before.The stuff is the same like if the touch panel was dirty/wet, although it isn't.When this happen, nothing can be done, only switch off the hod with the power on/off key. However, when turning it on again, the issue persists.The only way to walk around this is disconnect the mains cable. Then, the hod works fine again.My thoughts are that the problem is into the touch panel, so that I'm looking for the Repair Manual where all the part numbers appears.Any kind of suggestion will be welcome!
Siemens EQ.7 Plus  - Page 1
Forum section: electronics / repair

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: July 22, 2022, 12:48:15 pm
content: Hi.I have this caffe machine, on startup it shows error message "High or low voltage"What could be cause of this error?I searched the web but didn't find any schematic for main board.
Siemens KTP600 Touch HMI PCB Repair - Page 1
Forum section: electronics / repair

author: dagolard
author_rank: Contributor
timestamp: August 28, 2021, 10:22:48 am
content: Can anyone help me to identify the broken SMD parts?Bottom marked big resistor sould be 1R - right?The top marked 2 parts are a 0R bridge, but what's the right part? Resistor?

author: gamalot
author_rank: Super Contributor
timestamp: August 28, 2021, 01:28:12 pm
content: I think it is a 1-amp PTC made by Littelfuse.
Siemens Oscilarzet D1011 20MHz  - Page 1
Forum section: electronics / repair

author: Apofview
author_rank: Contributor
timestamp: August 27, 2019, 08:20:16 am
content: Just to share some images of Siemens Oscilarzet D1011 20MHz.Device come in fully working condition. Bought as a gift to a friend.Inside looks like very good engineered.Design is modular, just few screws to disassemble and to have access to different boards.No dust inside, and silk screen is good.

author: CJay
author_rank: Super Contributor
timestamp: August 27, 2019, 03:06:19 pm
content: Does that transformer say Grundig?

author: tautech
author_rank: Super Contributor
timestamp: August 27, 2019, 10:01:21 pm
content: Quote from: CJay on August 27, 2019, 03:06:19 pmSeems to.Wonder if it's a rebadged Hameg or Philips ?

author: CJay
author_rank: Super Contributor
timestamp: August 28, 2019, 06:57:32 am
content: Quote from: tautech on August 27, 2019, 10:01:21 pmPossibly neither, Grundig used to make their own 'scopes and that 'modular' look doesn't really match Hameg or Phillips*edit*Looks like a Grundig MO22

author: Apofview
author_rank: Contributor
timestamp: August 28, 2019, 08:31:38 am
content: Transformer is Grundig 09005-736.01

author: ivaylo
author_rank: Frequent Contributor
timestamp: August 29, 2019, 06:14:10 am
content: This was my first oscilloscope! 1991 or so. Mine was branded Siemens, but yes later saw the same thing under other labels. Thanks for posting...
Siemens PCU 50 Industrial PC part identification help - Page 1
Forum section: electronics / repair

author: markav2
author_rank: Contributor
timestamp: January 15, 2023, 06:38:12 pm
content: I'm working on a Siemens PCU 50 Industrial PC and I could use some help identifying the below part. No matter where I type in the part number to identify a datasheet it's coming back with nothing.Your help would be appreciated, thank you

author: fzabkar
author_rank: Super Contributor
timestamp: January 15, 2023, 10:30:04 pm
content: I don't see any pic.

author: markav2
author_rank: Contributor
timestamp: January 20, 2023, 02:00:26 pm
content: Sorry for not being able to see the image apparently I cannot use the share feature on Sync.com to host my photo's.You should be able to see the photo now.

author: TheMG
author_rank: Frequent Contributor
timestamp: January 20, 2023, 02:17:18 pm
content: Most likely candidate is ON Semi MBRA140. 1A 40V Schottky.

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: January 21, 2023, 06:28:13 am
content: Hi markav2,The datasheet of the part can be foundhere.
siemens ps 407 4a repair - Page 1
Forum section: electronics / repair

author: yasha
author_rank: Newbie
timestamp: March 12, 2025, 06:14:16 am
content: Hello, I recently started working in a PCB repair and testing company. I’ve been assigned to repair a Siemens PS 407 4A power supply module. I’ve tested and replaced various components on the module. However, to test this module, I need the rack that it fits into because the module won’t turn on without being connected to the rack. the rack is not available in the company. Therefore, I’m unsure how to verify if the module is functioning correctly.I will be greatfull to see any notes or websites that help me in my job.thank you.

author: Poroit
author_rank: Frequent Contributor
timestamp: March 12, 2025, 09:29:55 am
content: G'day yasha,Do you have a pic of the rear mounted connector?Do you think the Rack only provides connections for AC Input and DC Output?

author: Swake
author_rank: Frequent Contributor
timestamp: March 13, 2025, 08:29:35 am
content: This is a power supply for a Simatic S7. That connector will be like 60 pins or so big.Can't test them without proper test bench (ie. you need that rack and loads)

author: yasha
author_rank: Newbie
timestamp: March 13, 2025, 08:32:53 am
content: Thank you very much for your attention. Since the module does not turn on by applying input to the power supply, it definitely needs signals from the backplane bus. Consequently, in addition to providing the output voltage, it also has the function of communicating with other modules.Do you think there is a way to simulate these signals to turn on the module?

author: yasha
author_rank: Newbie
timestamp: March 13, 2025, 08:44:57 am
content: Thank you for your reply.As you mentioned, the connector is large and has 85 pins. However, connecting the power module to the system before testing is dangerous for other modules and may damage them if the power module is faulty. Therefore, there must be a way to test the module outside the system.

author: Swake
author_rank: Frequent Contributor
timestamp: March 13, 2025, 08:48:11 am
content: You might search for a reset or ready pin that needs to be pulled high (or low). Something very similar to what is found in computer power supplies.

author: Poroit
author_rank: Frequent Contributor
timestamp: March 14, 2025, 09:38:33 am
content: If you think your company will get a lot of these PS cards to repair, then consider building a test rack.There should be enough info out there Simatic S7 to help you.
siemens psu300s  - Page 1
Forum section: electronics / repair

author: salviador
author_rank: Regular Contributor
timestamp: July 22, 2020, 11:46:20 am
content: where I can find the electrical scheme of power supply siemens psu300s ?

author: TheMG
author_rank: Frequent Contributor
timestamp: July 22, 2020, 06:41:29 pm
content: Not exactly the answer you're looking for but... you probably won't find it anywhere.Most of the time you won't find schematics or service manuals for such power supplies, unfortunately.The good news is, most SMPS are designed around one of a small handful of different topologies, so it's not too hard to do some high level reverse engineering to figure out how it operates and how to troubleshoot it, provided you have prior experience repairing any kind of SMPS. Much valuable information can be gained by looking at the datasheets for whatever controller ICs the power supply happens to use.Good place to start is internal fuse. If it's blown, you probably have a shorted switching transistor. If it's not blown and the power supply doesn't work, or doesn't work quite right, it's probably going to be electrolytic capacitors (test with capacitance and ESR meter).
Siemens SE24N860EU/36 - Stuck on "0" After Cycle Completion - Page 1
Forum section: electronics / repair

author: AngusBeef
author_rank: Regular Contributor
timestamp: July 13, 2025, 09:33:26 am
content: Background:I had this dishwasher for a very long time. It originally had a failed LNK304 and related components, which I replaced. It failed again recently, and I damaged a trace beyond repair replacing the LNK.So I found/bought an identical (used) AKO 718774-02 board, which had its LNK304 replaced with an LNK306. Everything else is identical. The replacement board was tested for power only. I suspect it came from a non-powered dishwasher and was repaired via the LNK swap. After installing it, the dishwasher completed one full cycle washing, heating, drying etc. But afterwards, it became stuck on “0” and won’t progress or respond to the buttons (even reset).I’ve verified the door switch, float, pump, inlet valve, heater, filter, aquastop, thermostat, and thermal fuse - it all checks out. Wiring and harness continuity checks are good. Power-cycling, including leaving it unplugged for a day, doesn’t help. The system writes its state to EEPROM I believe.Assuming a software issue, I transplanted the original MCU to the new board. That worked for one cycle. The buttons worked again! But it froze again at “0,” buttons became unresponsive (even reset), and the display stayed static with no error codes or beeps. Only the rinse aid light remains on, as always (I don’t use rinse aid), and has never been an issue before.1. Is there a way to force a factory reset or clear the MCU memory? It's an NEC F0123H and I can't find a datasheet.2. What could the control board be failing to detect that prevents recognizing cycle completion?Photo of dishwasher model attached for context
Siglent 1052DL+ stuck at boot logo - Page 1
Forum section: electronics / repair

author: full_psih
author_rank: Newbie
timestamp: March 18, 2025, 01:47:34 pm
content: Hi! My Siglent 1052DL+ is stuck on logo. Can anyone share the USB recovery package? My e-mail: full_psih@ukr.net
Siglent function generator dead channel A - Page 1
Forum section: electronics / repair

author: KE4CDR
author_rank: Newbie
timestamp: October 23, 2022, 08:54:41 pm
content: I bought this Siglent 1032x function generator in Feb and now one of the channels, A, is non functional. I recall there was a thread where someone had the same problem and a good recommended fix was offered. Of course, now I can't find it. I believe I over taxed the channel and fried something and that's why it's not working. Since then I've implemented a strict circuit protection policy to avoid this in the future. But the problem is still there. I would rather not send it back to Siglent if I can avoid it. So, if anyone knows of a thread where this problem has been addressed, or knows how to fix the problem themselves, I would greatly appreciate any help. Best regards.KE4CDR

author: thm_w
author_rank: Super Contributor
timestamp: October 25, 2022, 01:04:15 am
content: Any idea what you mean by over taxed? Driving any decent sig gen into a dead short it should be able to survive.Probably the output opamp or possibly some output protection was damaged.Take the thing apart, look for any visual burns, measure the channel A output resistor compared to channel B. Measure the signal from the output back if you can with an oscilloscope.Many threads referenced here:https://www.eevblog.com/forum/repair/siglent-sdg1062x-goes-to-overvoltage-protection-mode/
Siglent SDG 5082 - Page 1
Forum section: electronics / repair

author: Johaness
author_rank: Newbie
timestamp: February 09, 2021, 10:41:09 pm
content: Hello!I'm trying to repair Siglent SDG 5082 digital waveform generator. Not sure what have happened with it before it broke down. But now there is only either -4V DC or -11,6V DC signal on both of its outputs, depends on waveform parameters (amplitude or offset) with any type of waveforms. Actually, it tries to produce waveform, but since there is an -11,6 (-4V) offset (maximum amplitude for this model is +-10V in HighZ mode), all i can see is the small positive part of the waveform. Here is teardown video and links to some photos.https://www.eevblog.com/2013/07/24/eevblog-497-siglent-sdg5000-function-generator-teardown/I checked all power supply voltages on checkpoints (according to the service manual), power supplies on output amplifiers - they are all ok.Next i tried to check signal path from DAC to the output, but it's not very obvious. I can say for now that there is kinda correct signal on Pin 2 of EL5166ISZ amplifier (no. 1 on the attached picture), and there is -4V DC on it's output Pin 6. I tried to change this opamp, but nothing changed.It's also strange that both channels have the same issue now, although only channel 1 has been used recently and i couldn't damage channel 2 output directly.Now i don't know what to do. As i can see, each channel has independent circuits and it's hard to damage both of them through the one channel output. So maybe there is a problem with something common for both channels? And can anyone explain me, how they produce DC offset in normal operation? I'm also wondering what is the function of circled part of the pcb?I would appriciate any help.Sorry for my english.Thanks.

author: tautech
author_rank: Super Contributor
timestamp: February 10, 2021, 07:03:42 am
content: Welcome to the forum.While these AWG's have isolated outputs they don't offer full protection against reverse voltages into the outputs and maybe the output stages have been damaged.SDG5000 might share similar construction to SDG1000 models that are from a similar age therefore there could be something to help in this thread:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/

author: Johaness
author_rank: Newbie
timestamp: February 11, 2021, 06:27:16 pm
content: Yeah. You were right. Thishttps://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/msg787268/#msg787268post helped me to localize the problem. The problem was with the analog MUX/DEMUX 74HC4051D, one of them located in the circled area on the picture (soic-14) and another one on its right, so i replaced both of them and everything works fine now.

author: tautech
author_rank: Super Contributor
timestamp: February 12, 2021, 12:15:33 am
content: Quote from: Johaness on February 11, 2021, 06:27:16 pmExcellent, well done !Thanks very much for reporting back.
Siglent SDG1025 Function Generator Dead Output Repair - Page 1
Forum section: electronics / repair

author: hesam.moshiri
author_rank: Regular Contributor
timestamp: September 30, 2025, 09:52:21 am
content: Siglent SDG1025 Function Generator Dead Output RepairI only replaced two components

author: coromonadalix
author_rank: Super Contributor
timestamp: September 30, 2025, 11:41:11 am
content: would be nice to add here the same youtube video commentsComponents replaced:THS3095/THS3091 (High-Speed Amplifier)BAV99 (Dual Diode for Protection)
siglent sdg1025 generator no output - Page 1
Forum section: electronics / repair

author: mrcurlyman
author_rank: Newbie
timestamp: September 17, 2023, 09:36:19 pm
content: Hello. I have a sdg1025 signal generator with no output on either channel. everything on the screen looks normal, it passes its self-test, according to the service manual all voltages on the board are correct except for TA15 and TA16. The manual says they should be 1.5v (sign wave). Im only have 800mv there is a sign wave but not at 1.5v. Anyone seen this type of problem? Thanks in advance

author: TimFox
author_rank: Super Contributor
timestamp: September 17, 2023, 09:44:47 pm
content: Could you re-phrase your description of the actual output you are getting?Your title says "no output", but your description awkwardly describes a substandard output.In the unit, what is between the test points (TA15 and TA16) and the output?

author: Macbeth
author_rank: Super Contributor
timestamp: September 17, 2023, 10:19:46 pm
content: Are you using Hi-Z or 50 ohm output?

author: mrcurlyman
author_rank: Newbie
timestamp: September 17, 2023, 11:46:47 pm
content: I get nothing on either HI-Z or 50ohm

author: mrcurlyman
author_rank: Newbie
timestamp: September 17, 2023, 11:50:34 pm
content: Im getting nothing out the front connectors. I not sure what's in-between the test points and the outputs Im looking for a schematic now

author: tautech
author_rank: Super Contributor
timestamp: September 17, 2023, 11:53:54 pm
content: Everything you need to repair it can be found in this thread:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/
Siglent SDG1032X is bricked by an incorrect remote command - Page 1
Forum section: electronics / repair

author: meduza
author_rank: Newbie
timestamp: April 03, 2025, 02:54:49 pm
content: Hello. I accidentally bricked my SDG1032X when playing with it remotely by USB, sending some commands to it. Now after powering up it shows booting splash screen, and then just black screen. Outputs was disconnected, the generator was only connected to my PC with USB when I bricked it. So it seems that it's a firmware bug causing the generator be bricked by some incorrect remote command.Anybody know, is there a way to reset it to the factory state? I tried to hold different buttons when powering up, but nothing helps.I foundby the Dave where SDG2122X had exactly the same behavior as mine: splash screen, and then black screen. Siglent provided him firmware files and a manual how to flash it with SD card for low level firmware update. But seems such files and manual aren't publicly available, at least I didn't find them on the Siglent website. Official firmware update procedure required the generator to boot up first.

author: tautech
author_rank: Super Contributor
timestamp: April 03, 2025, 10:09:05 pm
content: Contact Siglent support for the SDG1000X USB recovery package:support@siglent.comWhen it's recovered you will probably need to also install the latest firmware:https://int.siglent.com/download/firmwares/?ProId=20
Siglent SDG2042X Boot - Page 1
Forum section: electronics / repair

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: July 04, 2023, 01:40:57 pm
content: Hello,I have one concern about my function generator.When i power it up, after 20sec sometimes i can hear relay click like this: "click", and sometimes "click click".Is this an issue, bug, or just nothing to concern about?Thank you!Hrvoje

author: tautech
author_rank: Super Contributor
timestamp: July 05, 2023, 02:01:02 am
content: Quote from: Hrvoje_CRO on July 04, 2023, 01:40:57 pmNormal.

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: July 05, 2023, 10:42:48 am
content: Sir,Thank you!
Siglent SDG800 powers on but doesn't respond to key presses - Page 1
Forum section: electronics / repair

author: ESTechnical
author_rank: Contributor
timestamp: January 28, 2022, 03:49:47 pm
content: Hi everyone,I have picked up a siglent sdg800 that doesn't respond to any key presses. When the unit is switched on, the display works and all the front panel LEDs light. It gets past the splash screen to show the settings of a sine wave output, but nothing more happens. I have got the unit apart and probed around a bit to find there is no activity at all in the front panel ICs related to the buttons and LEDs. There's multiplexers and shift registers on the front panel PCB but no serial data or clock pulses to be found anywhere. I checked for the correct supply voltages everywhere there's a labelled test point. I can't find a schematic or service manual online.I've checked the front panel FFC is connected properly and continuity tested a few pins that I can follow from the shift registers and they are connected all the way back to the main board and then disappear inside the PCB layer stack and presumably go all the way to the microprocessor.Do you think I should cut my losses and dispose of the unit, or is there something that could be done to fix it? I had a look around the other siglent threads but didn't find anything about the controls not working. I hope I haven't missed anything obvious!Thanks very muchEd

author: bdunham7
author_rank: Super Contributor
timestamp: January 28, 2022, 04:35:15 pm
content: If you can identify the ICs that seem to be inert and then find a datasheet to show you the power and ground pins, you can test directly there to verify that they are powered up.I don't know if there is a front panel lock utility, but you might look into that. I wouldn't think that it would remain on through a power cycle, although there could be a malfunction related to it.

author: ESTechnical
author_rank: Contributor
timestamp: January 28, 2022, 04:44:53 pm
content: I've been testing the serial in and clk pins of the shift registers - it looks like these drive rows or cols of the keypad matrix and LEDs on the front panel. Nothing is coming to them from the main board. I suspect the ICs on the front panel are fine, just they receive no data and sit in a default state. There's no shorted pins, they are not heating up etc. They definitely receive the 3.3v supply.I can't trace where the signals come from/go to on the main board anywhere beyond the FFC connector. It looks likely that these are going straight the main processor which is a BGA package.

author: ESTechnical
author_rank: Contributor
timestamp: February 01, 2022, 09:51:45 pm
content: I contacted Siglent and they sent me firmware recovery/update files. The unit now works! I am really impressed with support from Siglent!
Siglent SDG805 won't boot (in a different way than all others) - Page 1
Forum section: electronics / repair

author: RCX2020
author_rank: Newbie
timestamp: May 16, 2020, 07:47:56 am
content: Hi everyone,Instead of simply throwing stuff away when it breaks down, like most people do, I decided it would be much better to try and repair some of it as best I can. Since the repairs get more interesting (more complex) each time I wanted to get some tools for helping me diagnose and possibly fix these problems.One of these tools is a signal generator. I found and bought a secondhand SDG805 from my local "craigslist" equivalent which was supposedly hardly used and in mint condition. Upon receiving it it looked in great shape, I switched it on, all buttons lighted up and.... nothing more... just a black screen and all buttons stay illuminated.The seller I bought it from was very nice about it, which regretfully isn't always so on craigslist, and fully reimbursed the costs. When I asked if I should send back the defective unit he told me I could keep it and do whatever I wanted with it.And here we are. Of course I'm going to try and fix the problem if I can- I've checked the power supply and it seems to be within specification (using the SDG1000 service manual since the SGD800 doesn't have one).- Checked if all connectors were properly seated and if there was any visual damage on the pcb- I've read all threads on this blog and anything else I could find on the net but nothing similar popped up.The most I could find about this unit is the boot freeze issue. But they all talk about being stuck on the boot logo screen. My screen doesn't even turn on, all the buttons light up and stay on forever.- No idea what kind of firmware is/was present on the device. The serial number before the last four digits reads 0314 which, as I understand, means this unit was produced in early 2014.I don't know if it's wise or useful to try the SD-card recovery method mentioned on this blog first (and if anyone has the required tools for me to do this would be great) even though the symptoms differ?Anyhow, all help on how to proceed would be greatly appreciated!Thanks, RCX2020

author: tautech
author_rank: Super Contributor
timestamp: May 17, 2020, 12:52:27 am
content: Welcome to the forum.Yes with early versions of FW these units are known to be troublesome but like you presume it doesn't sound like a FW problem.It's been a while since I had much to do with the 800 series but one of my customers has a heap of them so I can call on him for a few pointers if necessary......let me do just that.FYI 0314 is the actual SN# and the other characters before it denote the build dates and HW version.I have the recovery tools and if you PM me with your email we can provide them with a few conditions.
Siglent SDS 1052 Startup Issue - Page 1
Forum section: electronics / repair

author: PeteGarz
author_rank: Newbie
timestamp: December 26, 2024, 05:23:38 am
content: Have a Siglent SDS 1052 DL scope. It has been working ok for about 4 years. Out of warranty. It gets stuck in startup mode upon power up.Have tried the MATH button fix to no avail.How can I fix this?

author: MathWizard
author_rank: Super Contributor
timestamp: December 26, 2024, 06:31:05 am
content: Now IDK how these really work, or are laid out inside, but if they are anything like a motherboard, or GPU, or other common electronics with lots of voltage rails and a startup sequence....1st I would try and watch all the voltage rails come up in a logical order. Now if you know the IC's involved, and had a schematic (probably not) or map out some yourself, you might know the correct order for all the chips to power up.Maybe it gets so far, some chip is unhappy, and doesn't allow the next parts to power up ? If all the voltage rails are good, and all the main chips have power, then the game can continue, and maybe some little external circuit is acting up.Probably the worst thing will be if some big custom chip has a problem. Probably the only option for a hobbists, would be to try reflowing bad BGA joints.As for all the software problems, yeah IDK how hard it is to get inside there and actually do anything. If you were lucky, maybe some little common MCU or EEPROM has a problem, and you could get a copy somewhere.

author: PeteGarz
author_rank: Newbie
timestamp: December 26, 2024, 09:24:14 pm
content: Went to Siglent Tech support with little hope in finding a solution.The tech guy (Jim) replied with a link with recovery files.It actually worked!!Please close my case. Glad to know this place exists.For fun and learning, design and build custom amps for home audio and guitarists.Sometimes run into situations and issues in my builds; usually unwanted noise and hum.

author: tautech
author_rank: Super Contributor
timestamp: December 27, 2024, 02:53:12 am
content: Quote from: PeteGarz on December 26, 2024, 05:23:38 amSDS1052DL+ is the correct model name.Earlier firmware is known to sometimes present a boot freeze but there are USB and SD card recovery packages to get them going again.As always, keep the installed firmware updated to the latest version.https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1000DL+_V6.02.01.13_EN.zip

author: MathWizard
author_rank: Super Contributor
timestamp: December 28, 2024, 02:49:19 am
content: I'm used to thinking of hardware, not software. I'd have the operating scalpels out already when they just had the cold.

author: tautech
author_rank: Super Contributor
timestamp: December 28, 2024, 05:36:24 am
content: Quote from: MathWizard on December 28, 2024, 02:49:19 amAs are many older EE, however today the SW provides the feature set supported by the HW.
Siglent SDS 1104X-E screen display inverted with artifacts - Page 1
Forum section: electronics / repair

author: jeraymond
author_rank: Contributor
timestamp: September 20, 2021, 12:52:46 pm
content: Hello,My Siglent SDS 1104X-E screen display is inverted. There are also digital artifacts on the right side of the display. (You can see on the soft key menu, now upside-down at the top of the screen, the blurred text.) It was on and running normally and the display just flipped.This issue persists through reboots and I'm greeted with an upside down Siglent logo as it boots.I'm looking for some advice and any guidance on troubleshooting the problem. I haven't opened it up yet, but plan to take a look later today.Thanks a lot!Jeremy

author: tautech
author_rank: Super Contributor
timestamp: September 20, 2021, 01:16:29 pm
content: Oh hell, never seen that !Claim the 3yr warranty.....it's busted.info@siglentna.com

author: Stuart Coyle
author_rank: Contributor
timestamp: September 21, 2021, 08:16:14 pm
content: You probably have the Australian version. Sell it to Dave.

author: tautech
author_rank: Super Contributor
timestamp: September 21, 2021, 09:37:49 pm
content: Quote from: Stuart Coyle on September 21, 2021, 08:16:14 pmGood call but it's probably just something as simple as a display ribbon cable or connection however the scope must be completely dismantled to check it out properly as the display ribbon cable does not go directly to the display but to another connector on the back of the screen where the signal passes into the last ribbon that enters the insides of the panel.Of course digging this deep needs some specialist tools and some good amount of care so a warranty return is best and let Siglent techs deal with it.

author: jeraymond
author_rank: Contributor
timestamp: September 26, 2021, 09:47:47 pm
content: Quote from: tautech on September 21, 2021, 09:37:49 pmThanks for the advice about the warrantee. I didn't realize Siglent had a 3 year warrantee on their devices. I got in contact with their support, got an RMA #, and shipped them the unit for repair. I'll post back once I've got the unit fixed and back in my hands.

author: jeraymond
author_rank: Contributor
timestamp: October 29, 2021, 12:43:49 pm
content: I got the unit back repaired a couple of weeks ago. All seems well.
Siglent SDS1052DL oscilloscope stuck in start up [Fixed] - Page 1
Forum section: electronics / repair

author: buue
author_rank: Newbie
timestamp: May 30, 2016, 12:51:35 pm
content: Hello,I have a Siglent SDS1052DL oscilloscope and when I turn it on it just stays on the start up screen and does nothing else, I can't seem to get any response from it, any ideas as to how to fix it would be much appreciated.

author: TheAmmoniacal
author_rank: Unknown
timestamp: May 30, 2016, 12:59:19 pm
content: Try messaging Siglent America and Siglent on the forum?https://www.eevblog.com/forum/profile/?u=83560https://www.eevblog.com/forum/profile/?u=97174Could you file a warranty claim?

author: tautech
author_rank: Super Contributor
timestamp: May 30, 2016, 08:52:20 pm
content: We have another newbie impatient for a fix and has double posted.Answers given to his dilemma in the other thread:https://www.eevblog.com/forum/testgear/siglent-sds1052dl-stuck-in-startup/

author: buue
author_rank: Newbie
timestamp: May 31, 2016, 10:42:54 am
content: Quote from: tautech on May 30, 2016, 08:52:20 pmyeah sorry about that I had borrowed it from a friend and it stopped working so I was in a bit of a mad rush to fix it. Siglent sent me the method to fix it, works now!

author: LA7SJA
author_rank: Regular Contributor
timestamp: May 31, 2016, 07:44:11 pm
content: Thank you for sharing "the method", now we all know how to fix this problem.Johan-Fredrik

author: charles young
author_rank: Newbie
timestamp: November 05, 2016, 05:26:44 pm
content: Yes, please post the fix! I have the same problem after enjoying this instrument for 2 months.

author: tautech
author_rank: Super Contributor
timestamp: November 05, 2016, 09:19:47 pm
content: Quote from: charles young on November 05, 2016, 05:26:44 pmWelcome to the forum.From my notes:Press Math button rapidly at boot splash screen.Please ensure your unit has the latest FW: Current Version: 5.06.02.16 Published 2014-09-26http://www.siglentamerica.com/Uploadfile/file/20140926/SDS1000DL_Update_EN.rarFor SDS1000DLONLY

author: charles young
author_rank: Newbie
timestamp: November 06, 2016, 03:55:33 am
content: Thank you! I found I had to start hitting MATH rapidly immediately after turning it on and it eventually came up. I am sure this will help others in the future.

author: markopolo
author_rank: Newbie
timestamp: January 07, 2024, 06:01:19 pm
content: I have the same problem and have aleady tried the math button is there any other option to fix hang on logo screen?

author: markopolo
author_rank: Newbie
timestamp: January 07, 2024, 06:32:04 pm
content: Hi Tautech I have the same problem with my siglent 1052DL+ already tried the math button but no luck is there another way to get it working again?My scope is not in the waranty anymore.Best Regards

author: tautech
author_rank: Super Contributor
timestamp: January 08, 2024, 12:26:24 am
content: Quote from: markopolo on January 07, 2024, 06:32:04 pmStill on holiday for another week.

author: markopolo
author_rank: Newbie
timestamp: January 27, 2024, 07:20:37 pm
content: Are you still on your hočliday Tautech or yopu can answer my question now ?Regards
Siglent SDS1202X-E  scope noise - Page 1
Forum section: electronics / repair

author: howard123
author_rank: Newbie
timestamp: January 21, 2023, 11:11:18 am
content: Good morningI have had this scope for 4 years and it quite suddenly developed a 308kHz sine wave noise signal superimposed on top of the regular signal. It is difficult to quantify the signal size as it remains a more or less constant size when the probe scale (*1, *10,*100) is changed, but does change size when the amplitude (volts/ cm) is changed. Everything else seems ok.Anyone had a similar experience perhaps. I have thought to change the PSU caps. A PSU circuit would be very helpful.thanks
Siglent SDS2102 not booting up after FW update! - Page 1
Forum section: electronics / repair

author: MetalHead
author_rank: Contributor
timestamp: October 18, 2024, 01:21:21 pm
content: Hello guys!today I decided to upgrade FW on my Siglent SDS2102 scope to v1.2.2.2 and after that scope is not booting up any more. In fact it stuck with blank screen without going to "Siglent" logo. FW that was prior upgrade was 1.02.01.28R1..Is there any way to recover the scope, maybe through USB drive with previous firmware?
Siglent SGD810 not booting - Page 1
Forum section: electronics / repair

author: heraclio
author_rank: Newbie
timestamp: August 03, 2022, 09:46:01 pm
content: Hi !!I case someone have the same problem I had with the waveform generator Siglent SGD810, I found "magic" a solution.My instrument didn't starts up, it seems that the booting process didn't starts, and all buttons keep with their light on.Solution: with the Help button pushed, turn on the instrument. That's all !I hope this message will be helpful to someone.

author: tautech
author_rank: Super Contributor
timestamp: August 05, 2022, 04:16:25 am
content: Quote from: heraclio on August 03, 2022, 09:46:01 pmWelcome to the forum.Good find !Old SDG800 units did have some SW and boot freeze issues however if you're running the latest firmware problems are now very rare.We advise all owners of SDG800 to install late version firmware that offers much better resistance to boot freezes and allows for the simple USB recovery should you have the bad luck to get a freeze.https://int.siglent.com/upload_file/zip/firmware/Signal_generator/SDG800_V1.08.01.15_EN.zip

author: joeideal
author_rank: Newbie
timestamp: August 17, 2022, 12:05:32 pm
content: HiI have same issue but with SDG830Please can you help, was ok one day then next just got this. I checked all electronics as per Eevblog all okI contacted Siglent service but they have not been in touch yet.I never updated as was running ok until yesterday :-(Any help is highly appreciated

author: tautech
author_rank: Super Contributor
timestamp: August 17, 2022, 12:17:52 pm
content: Quote from: joeideal on August 17, 2022, 12:05:32 pmWelcome to the forum.Did you try the remedy above ?Message sent.

author: joeideal
author_rank: Newbie
timestamp: August 19, 2022, 03:11:00 pm
content: HiYes triedDidn’t work. Not sure that is a solution or a one off.
Siglent SGD830 - Page 1
Forum section: electronics / repair

author: coerl21
author_rank: Newbie
timestamp: April 30, 2022, 06:39:28 pm
content: i received the "overvoltage protection" warning and no output. Having studied the posts on here I have the correct signal up to the relay that switches to the BNC socket. There is 5v on the coil but no zero volts on the other end. I'm unable to trace the circuitry - is it a multi-layered board? This signal is from U17 (3095) to K3 relay to K4 relay (if it were energised) to BNC. It seems to be a permanent 5V feed to the coil. Does it form a collector load of a transistor? I'm struggling with SMD - it's too small for my eyesight!Any help would be appreciated. I will only use it for aligning radios so I only need a modulated sine wave AM/FM.

author: tautech
author_rank: Super Contributor
timestamp: May 02, 2022, 08:05:53 pm
content: Quote from: coerl21 on April 30, 2022, 06:39:28 pmWelcome to the forum.It's very possible you will find the answers you need here:https://www.eevblog.com/forum/repair/help-fixing-siglent-sdg805/SDG800 and 1000 series thread here:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/

author: coerl21
author_rank: Newbie
timestamp: May 05, 2022, 08:16:37 am
content: Thank you for the reply. I have read those posts and I was prepared to replace an op amp and Bob's your uncle; but the relay to output the desired waveform is not energising although I have a perfect 470khz sine wave which can also be modulated on the contact of the relay. Is something seeing an overvoltage and shutting of the relay for protection? Selecting a peak to peak voltage of less than 1 volt and I can't seem to find a response anywhere.I have discovered that one of the address lines of a MUX has "mush" going into it and mush coming out of a data pin. I would presume that an address line should be 1 or 0 and not have any type of wave function applied to it. So more in hope than anything else I'm awaiting a new ic to replace it. All of the relays are switched by the zero side of the coil. I was expecting to find some form of transistor array but couldn't. It's a pity there isn't a circuit diagram or even a block diagram would be useful. I do flounder without a circuit diagram!
Siglent SPD3033X-E component ID - Page 1
Forum section: electronics / repair

author: R-1125F
author_rank: Regular Contributor
timestamp: November 05, 2022, 02:20:56 pm
content: I am repairing a Siglent SPD3033X-E power supply. There is a short somewhere dragging down a 78L05 regulator and another component that I can't identify is getting hot. The unidentified parts is an SOT223 package with marking 81Y6 and N05A shown in the photo. The silkscreen identifies it as U2, it's an IC. I suspect it is some kind of regulator. Anybody know a part number for this?A schematic would be a big help.

author: R-1125F
author_rank: Regular Contributor
timestamp: November 05, 2022, 06:30:08 pm
content: I figured it out. It's an LM1117MP-3.3.

author: fzabkar
author_rank: Super Contributor
timestamp: November 05, 2022, 07:16:13 pm
content: Just FYI ...http://www.smdmark.com/en-US/search/code?id=n05a
Siglent SPD3303X-E fuse ratings - Page 1
Forum section: electronics / repair

author: R-1125F
author_rank: Regular Contributor
timestamp: January 26, 2023, 08:06:36 pm
content: I am working on a Siglent SPD3303X-E power supply. There are a couple of blow fuses. Parts are labeled on the board F101, F201, and F301. Of course, the rating is not visible and I would like to get replacements before I start taking it apart. The fuses are a real pain to replace. Could someone tell me the ratings for the fuses on the power board?

author: tautech
author_rank: Super Contributor
timestamp: January 26, 2023, 09:28:19 pm
content: Service manual is available here but after a scan through it there doesn't seem to be any specs for the fuses:https://www.siglenteu.com/wp-content/uploads/dlm_uploads/2019/07/SPD3000X-Series-Service-Manual.pdfI have a control PCB that just has F1 a leaded 6.3A fuse clearly marked on one end.Time to get out a magnifying glass ?

author: R-1125F
author_rank: Regular Contributor
timestamp: January 26, 2023, 11:46:34 pm
content: I have the service manual. It's too bad they left out that little bit of information. I have another SPD3303X-E open here and used a microscope to look at the fuses. The fuses on the power board appear to be all 6.3A. F101 and F301 are definitely marked 6.3A. I can't get a good look at F201 but I think it's the same.

author: tautech
author_rank: Super Contributor
timestamp: January 26, 2023, 11:57:47 pm
content: Quote from: R-1125F on January 26, 2023, 11:46:34 pmF201 should be for ch2 and therefore be same as ch1.Trace the wiring for confirmation.

author: R-1125F
author_rank: Regular Contributor
timestamp: January 27, 2023, 03:30:04 am
content: I agree. I think all the soldered-in fuses are 6.3A.
Siglent SPD3303X-E need diode id - Page 1
Forum section: electronics / repair

author: R-1125F
author_rank: Regular Contributor
timestamp: February 22, 2023, 10:28:16 pm
content: I am working on a Siglent SPD3303X-E power supply and I think one of the diodes on the main board is bad. It is a surface mount glass diode in a MELF package and has a black band. That is the only marking. Anybody know what this part is?