hybridfree/eevblog-posts huggingface dataset:
Anritsu signal generator MG3642A -  synthesizer unlocked.   - Page 1
Forum section: electronics / repair

author: geshka
author_rank: Regular Contributor
timestamp: April 25, 2023, 09:56:24 pm
content: Hello team.I have Anritsu MG3642A which is showing that message on the screen "synthesizer unlocked" . It is not generating any output... to be exact there is some output sometimes which off from the displayed frequency and it appears and disappears randomly.Wondering if there any service manual or any idea of way to fix it (if any).ThanksGene.
Anritsu sitemaster S331D - Page 1
Forum section: electronics / repair

author: 1VOX
author_rank: Newbie
timestamp: May 30, 2023, 12:41:16 pm
content: I have a faulty S331D. It reports integrator failed at start and VNA integrator failed during self test. When measuring the return loss, I feel it works. You don't know where to look for the error.Thank you

author: vishaldotgupta
author_rank: Regular Contributor
timestamp: April 18, 2024, 07:07:59 am
content: your unit has faulty RF section. most probably MMIC is cause of failure in such cases. is your unit a single port or two port version. I mean the two port unit comes with internal power meter option and has two N female test ports on the front panel

author: 1VOX
author_rank: Newbie
timestamp: June 01, 2025, 06:56:32 pm
content: I have one port.

author: ME
author_rank: Frequent Contributor
timestamp: June 01, 2025, 07:28:04 pm
content: How about doing a sweep and see if it has rf coming out of its ass.

author: 1VOX
author_rank: Newbie
timestamp: June 02, 2025, 07:33:43 am
content: We will try it. The results of the measurement are probably correct. For loads of 35, 75 and 100 Ohm, it shows the correct return loss.
Anritsu/Wiltron 541xxA scalar analyser repair - schematics wtd - Page 1
Forum section: electronics / repair

author: gab_au
author_rank: Contributor
timestamp: April 03, 2018, 09:11:41 am
content: Hi all,I'm attempting to repair a Wiltron 54107A scalar analyser. The backup battery has cooked on the CPU board ( a common fault with these I believe). By the time I received it the fan had blown the acid and fumes around the unit and the CPU board has significant damage and it's a multilayer board!There are ICs missing legs which are easy to address. There are also missing tracks and pads, which are also easy to address. The big problem is there are a number of vias that are also damaged - and some of them are for internal layers - not so easy to fix!The only way I'm going to repair this is with access to the schematics for the CPU board.A long shot but ..... would anyone have a service clip for the 541xxA analyser and willing to share, or at least a schematic for the CPU board?ThanksGregApologies if this posts twice - the submit form got stuck for some reason.

author: metrologist
author_rank: Super Contributor
timestamp: April 03, 2018, 02:21:57 pm
content: You have seen the product page and there is a MM in the library tab (no schematics there).https://www.anritsu.com/en-us/test-measurement/products/54100aWhat is the board number? Might be a sticky label or part of the silkscreen.

author: gab_au
author_rank: Contributor
timestamp: April 04, 2018, 05:53:12 am
content: Hi,yes I have the maintenance manual , programming manual and operator manuals, thanks.The board is the A7 card, this one is a 54100-D-40057-5G the 5G comes from the label on the back of the board "D40057-5G". The MM doesn't identify a -5G, it has -4,-6 and -7. This one does have GPIB but I don't know if it has distance to fault, the flash roms look OK, no corrosion etc so I think the firmware will be OK. There are no checked options on the back panel.CheersGreg

author: rohmeooo
author_rank: Newbie
timestamp: January 04, 2022, 12:34:42 am
content: Hi!Sorry to stir up an old post, but did you ever find a solution here?I've got a similar problem with a 54111A where the cmos battery has corroded.I've cleaned up as much as I can but I can't find any more issues -- no more broken vias/tracks.Screen boots up and says it find the memory, but then just craps out when loading the program.Eventually the screen says "error passing AA to host", whatever that means.Anyways can't find any replacement boards nor schematics, so i'm hoping you were able to make some progress on this one!
Anritus S331A Firmaware - Page 1
Forum section: electronics / repair

author: Boofrmb
author_rank: Newbie
timestamp: November 15, 2023, 09:33:06 am
content: Hi All.Just seeing if there maybe someone out there that would have a copy of the S331A firmware.It appears that mine has a dead eprom, which in turn has converted it back to S110A.Hoping to obtain firmware so I can burn a new eprom to bring my old S331A back to life.Thanks in advance.Robert
Antec TP3-550 PSU shuts off under load - Page 1
Forum section: electronics / repair

author: bogdan2014
author_rank: Regular Contributor
timestamp: April 12, 2023, 02:05:38 pm
content: I have an Antec True Power Trio TP3-550 ATX PSU for repair and it shuts off under load (as low as 200mA), but only for the +5V, +3.3V and -12V rails. The +12V rail can be loaded to the max with no issues. I'm guessing something must be triggering the protection circuitry, but since there's no schematic available I'm asking maybe someone has encountered this issue before.I eliminated the usual culprits - bad capacitors. Since the 12V rail can be loaded, I'm also eliminating any issue on the primary side.I'm digging through the PSU to find out what controller they use, it's incredibly crowded with components.
Antique Blaupunkt car radio help.(fixed) - Page 1
Forum section: electronics / repair

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 25, 2024, 01:24:46 pm
content: Blaupunkt car radio Bamberg CR stereo 455 7634934210 SN: G5490440, Amplifier 8638710305 SN: 0755865.The amplifier contains 4 parts I can't ID W700, W710, W720, and W730 all custom IC's?I need a schematic on this (rare) amplifier or at least pinout of these parts?These units also came with a UKW Stationwahler 7607127000 SN: F0489781.Thanks for any help.Jeff

author: DVM-James
author_rank: Contributor
timestamp: February 25, 2024, 02:52:02 pm
content: This "W710" ++ are resistor-networks - and yes, they are customer-specific . ( -didn´t go defectiv so often - as I remember)Have a look to tatalum capacitors !I found that attached file only - may not fit to your radio.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 25, 2024, 04:21:37 pm
content: Thats the manual on a very close (useable) radio but not close on the amplifier.At least I now know what these parts are and they may be OK but signal is clean on one pin (assume input)and distorted on other.I only tested tant's for short so far, and the fact someone was in this before me after they hooked it up wrong "twice"made me want a manual, two blown runs, only one they fixed.I found they also removed the output transistors insulators and bent the heatsinkThanks,Jeff

author: coromonadalix
author_rank: Super Contributor
timestamp: February 25, 2024, 05:10:50 pm
content: not being rude, ditch this repairif they were badly played in it .... before you .. you'll have to assume and check all the mess before beig ok to assume now i have the real problem ..my 2 cents, when i see this i simply move on

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 27, 2024, 12:24:44 am
content: I feel the same way most times, but antiques tend to be simpler and repairable and I charge more for stupidity.Jeff

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: February 28, 2024, 12:56:12 am
content: Found the problems, same in each channel BC328N shorted (not sure on baseing) middle leg to left leg.Strange it did not draw more current.Jeff

author: coromonadalix
author_rank: Super Contributor
timestamp: February 28, 2024, 05:06:50 pm
content: good + tenacity
Antique Bosch / Enraf ultrasound therapy schematics - Page 1
Forum section: electronics / repair

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 23, 2024, 11:34:47 pm
content: I'm looking for schematics for the Bosch Sonomed 2 or Enraf Nonius Delft Sonopuls 434 machines.I have found the Sonopuls 464 manual online but this is a much younger beast so not that much use.
Any ideas on how to fix the connector  - Page 1
Forum section: electronics / repair

author: FatMexican
author_rank: Contributor
timestamp: June 29, 2024, 11:01:50 pm
content: One of the wires broke from the connector any ideas on how best to fix it.

author: langwadt
author_rank: Super Contributor
timestamp: June 30, 2024, 12:06:07 am
content: looks like JST, get the pin out and crimp new on the wirehttps://www.ebay.com/itm/404990489580

author: Whales
author_rank: Super Contributor
timestamp: June 30, 2024, 12:13:02 am
content: Note that there are lots of JST variants, make sure to measure yours and compare it with the pictures exactly.
Any ideas on these LED chips? - Page 1
Forum section: electronics / repair

author: aroby
author_rank: Regular Contributor
timestamp: December 19, 2019, 05:39:34 pm
content: I have a swimming pool with Savi Melody lights installed. They keep failing, and the supplier won't replace them anymore. So, this time I'm going to try to fix the light.The electronics seem fine, although I will replace the caps - you can see heat discoloration on the housing next to where they are located. What has failed is the red LED chip. It will be tricky to replace, but the trickiest bit is determining the part!I've not yet been able to test this on a bench, but I assume all the LEDs are the same as the green one (D5), with 16 LEDs. The chip measures 4.75mm x 3mm.Thanks for taking a look. I hope I can save myself the $200 it costs to get a new unit.Anthony

author: TheMG
author_rank: Frequent Contributor
timestamp: December 19, 2019, 06:52:44 pm
content: First step is going to be to figure out what voltage and current the LEDs are run at. Once you've figured that out it should be a simple matter of searching Digikey or some other supplier for a suitable replacement. If in doubt about the current rating, you can always go with a higher rated LED to be on the safe side.Are those bare solder pads connected to the same place as the LEDs that are directly wire-bonded to the PCB?

author: kilobyte
author_rank: Regular Contributor
timestamp: December 19, 2019, 08:18:06 pm
content: The LEDs are looking like luxeon rebel.https://www.digikey.de/de/product-highlight/p/philips-lumileds/luxeon-rebel-color-emitters

author: rvalente
author_rank: Frequent Contributor
timestamp: December 20, 2019, 12:06:42 pm
content: Everlight has similar parts, same package

author: Psi
author_rank: Super Contributor
timestamp: December 20, 2019, 12:22:50 pm
content: From the PCB discoloration clearly they are failing due to getting too hot.So you will want to lower the current going to them a bit.

author: TheMG
author_rank: Frequent Contributor
timestamp: December 20, 2019, 11:49:08 pm
content: Quote from: Psi on December 20, 2019, 12:22:50 pmI dunno, the pattern of the discoloration doesn't really seem consistent with heat (should be a more or less even discoloration around the LEDs). There's some strange discoloration around some of the vias that are nowhere near the LEDs. To me looks more like corrosion from moisture ingress which is a very likely scenario considering these are pool lights.The LEDs might actually be fine and the PCB traces, via, or solder joint could simply have gone open.

author: james_s
author_rank: Super Contributor
timestamp: December 21, 2019, 12:14:00 am
content: Certainly looks like heat to me, but not necessarily from the LEDs. What's on the back of the PCB? Perhaps the uneven heat is due to poor thermal contact?
Any information on JL2365/JL3365/JL3375 trail camera SOC - Page 1
Forum section: electronics / repair

author: elliot
author_rank: Newbie
timestamp: November 03, 2024, 03:18:38 pm
content: Hi,I have a pile of broken trail cameras and cannot find any data on the SOC used.The SOC used is a Jielin JL3375 (LQFP128), but the JL2365 and JL3365 are pin compatible.At minimum I need the pinout for the SOC, this would allow me to have a chance ofreverse engineering the cameras.I would be grateful for any information.Cheers, Elliot

author: fzabkar
author_rank: Super Contributor
timestamp: November 03, 2024, 04:42:23 pm
content: Look up the FCC ID in the FCC database. Sometimes there will be a publicly available circuit diagram.For example, this camera uses a Sunplus SPCA6350M SoC:https://fccid.io/2ALGTBTC9-10/Schematics/Circuit-Diagram-3416090.pdfhttps://fccid.io/2ALGTBTC9-10

author: elliot
author_rank: Newbie
timestamp: November 03, 2024, 09:29:35 pm
content: Thanks fzabkar for the suggestion, I tried looking up every device I could find that used JL2365/JL3365/JL3375 SOCson the FCC database, none had a schematic or even a block diagram.I suspect it is a condition of the NDA manufacturers sign in order to design using the chip.Cheers, Elliot.
Any need to recap an HP 339a? I've already done the notch filter & power supply - Page 1
Forum section: electronics / repair

author: EvanF
author_rank: Newbie
timestamp: November 23, 2020, 03:51:23 am
content: I've also done some mods (the DIYaudio.com mods) to it as well as calibration

author: tkamiya
author_rank: Super Contributor
timestamp: November 23, 2020, 04:05:50 am
content: My experience is that HP equipment does not require recapping as a wholesale remedy. HP used highest quality parts, many of them are MIL spec. I've taken out 30 year old+ capacitors and they measure just fine. Unless one is visibly damaged or any fault traces to possible failure of a particular capacitor, I don't recap. I practice "do no harm" when refurbishing old equipment. To this date, I've worked on probably close to 100 HP stuff. I found a bad cap in 3 instances. None of them were in power supplies.... I've found as many resistors and transistors gone bad.

author: wn1fju
author_rank: Frequent Contributor
timestamp: November 23, 2020, 12:32:45 pm
content: Like the previous poster, tkamiya, I have worked on about 150 different HP pieces (from the 1970-1990 time period). But my percentage of faulty capacitors has been somewhat higher - about 10% of the pieces had faulty caps. Perhaps that is because I actively seek out and buy broken pieces so I can enjoy the challenge of repairing them. I would expect the faults statistically to be lower among all HP equipment.From my experience, the small, silver colored Sprague electrolytics are the worst. The large "computer grade" electrolytics one usually finds after the bridge rectifier in the power supply have always been good. Occasionally, a tantalum capacitor will short - these are relatively easy to find when they do.If I see one or more electrolytics spewing its guts out, or bulging a lot, I usually replace it. If it is on a board with a few other similar types, I usually replace them all. Capacitors are pretty cheap.Oh yes, if you see any gold colored Rifa suppression capacitors at or near the AC entry point, replace them without hesitation simply as a precaution (they will eventually explode causing a smelly mess).

author: TERRA Operative
author_rank: Super Contributor
timestamp: November 23, 2020, 02:23:47 pm
content: I'd be inclined to pull just a couple here and there as a random selection and test them thoroughly (leakage, dissipation, capacitance value etc), if they test ok, the rest areprobablyok too.

author: precaud
author_rank: Frequent Contributor
timestamp: November 23, 2020, 03:34:56 pm
content: There's aren't many 'lytics in a 339A...
Any of these smd components a voltage regulator?  - Page 1
Forum section: electronics / repair

author: artvandalai
author_rank: Regular Contributor
timestamp: December 17, 2024, 10:06:04 pm
content: I have a Concept2 rower monitor that doesn't shut down and keeps turning on after being turned off. Any of these smd components a voltage regulator? I tried searching the ids printed on these components but couldn't find much info.

author: fzabkar
author_rank: Super Contributor
timestamp: December 18, 2024, 12:04:20 am
content: A voltage regulator would usually have a filter capacitor on the input and another on the output. None of your 3 ICs seem to fit.TPS61026DRCR, Texas Instruments, 5.0V Output, 1.8-A Switch, 96% Efficient Boost Converter w/ LDO Down-Mode, marking BRD, QFN-10:https://www.ti.com/lit/ds/symlink/tps61026.pdfae-pic-a1.aliexpress-media.com/kf/S8300fb10adcf422885f6501d083a39fev.jpg(photo)http://markingcodes.com/search/c/brdUPxxx = 74LVC1G14SE-7http://markingcodes.com/search/c/upxxx

author: MathWizard
author_rank: Super Contributor
timestamp: December 18, 2024, 10:32:08 pm
content: So is there a button or something, to just turn off the LCD screen, and it turns off, but then keeps turning back on ?On all the LCD stuff I worked on lately, there was an MCU with outputs specifically meant for directly driving LCD segments/com's. And only that MCU had final control over output to the LCD. However on the DMM I was working on, there was another MCU, telling the LCD MCU, what to do.There could be some external logic gate circuit getting mixed up, and turning the LCD back on. I'd want to know where the signals to the LCD come from, what IC, and what other IC's is it connected to ??Why do you think it's power related ? Have you checked it already with a DMM and know it's related ? Maybe there's a backlight, does it also come back on ?? Maybe the whole unit is powered off to disable it, and power gets sent back to it when it's not supposed to be. If it was something like that, yeah I'd be looking at any enable pins and logic circuits for enable signals.

author: artvandalai
author_rank: Regular Contributor
timestamp: January 18, 2025, 05:57:41 am
content: There is a button to turn the monitor off and back on but when you press it it turn back on a few seconds later.I'm mostly following the advice from this member who has had this same problem before. His monitor he had problems with was an earlier model so some of the components are different. The member mentions to check and change the voltage regulator.https://www.c2forum.com/viewtopic.php?f=10&t=185252&p=589699#p586356
Any one have luck to repair Metcal MX-PTZ tweezers broken cord? - Page 1
Forum section: electronics / repair

author: hurtmanissimo
author_rank: Contributor
timestamp: February 06, 2023, 07:52:37 am
content: I've had MX-PTZ tweezers for about 5 years, in the last year of light use it started giving me a LOAD ERROR sometimes when I use them.After dismantling the plastic, I got inside and found a damaged coaxial cable in the fixation point (poor design, does not prevent the cable from turning).to repair the cable, you need to disassemble the sleeve where two cables fit. one from the station, the other to the second hub.I thought it was threaded, but I can't move it when I try to turn it by holding on to the slot on the steel side and the square on the brass. I try not to break it, so I don't apply too much force. holds on tight... tried to heat it up - still no luck.Has anyone had this kind of luck with this repair?

author: hurtmanissimo
author_rank: Contributor
timestamp: February 06, 2023, 02:13:17 pm
content: The general design is a sleeve on the wire on the right AMP 16-14 - 2.5mm crimp, which should hold the wire. broke after her.The wire enters one cartridge holder and exits from there to the second. glued in the middle.The size of the occasions inside, for further repairs.The first disassembled sleeve where two wires come.inside, a 22µH inductor and a 270pf capacitor, which are connected in series on one side, are soldered to the outer conductor of the bushing and the signal core from them goes to the second cartridge.the central core without mass comes from the incoming cable. The total mass of the braided cables is soldered on the outside, to the lug on the back.location of the insulation. heat shrink isolates the LC circuit from the central core.The second cartridge - I already wrote that it has a slightly different design, since it regulates the convergence of the tweezers. on the first - adjustment back and forth. When disassembling, it is better not to twist the slot - then the sleeve will not be put on. very precise fit.After a little violence - we get access inside.Everything is simple here - the core comes to the center, the braid is soldered onto the outer sleeve.the clamps that hold the adjusting screws are removed by knocking out the axis. it looks like a rivet, but it's not a rivet.assembly is a little more complicated - since it is necessary to assemble with the wires wired in place.

author: YetAnotherTechie
author_rank: Regular Contributor
timestamp: February 07, 2023, 07:38:02 pm
content: Quote from: hurtmanissimo on February 06, 2023, 07:52:37 amIn the second post you showed it dissasembled, can you confirm is just a press-fit?Thank you

author: hurtmanissimo
author_rank: Contributor
timestamp: February 08, 2023, 08:18:26 pm
content: cartridge insert, or black-case?cartridge insert is press-fit. very tight.

author: scrofula
author_rank: Contributor
timestamp: May 23, 2024, 09:56:39 am
content: ...thank you brother, very useful information, stay in touch)))
Any recommended Printing Services in US for Service Manuals? - Page 1
Forum section: electronics / repair

author: _rushin_or_draggin_
author_rank: Regular Contributor
timestamp: November 16, 2024, 05:53:56 am
content: Hey all,I've been thinking about getting some of my scans of service manuals printed as I much prefer physical copies when working (plus it looks nice on the shelf!)From what I've seen I doubt I'll be able to get a bound version for a decent cost, so I guess I'm leaning towards a simple three hole punch print that I can put in a binder (plus I can make the foldout pages if I wanted).Do any of y'all have any recommendations before I go with staples or somewhere like that?Thanks

author: Stray Electron
author_rank: Super Contributor
timestamp: November 17, 2024, 02:40:57 am
content: Any place like Office Max, Staples or Kinkos can copy them but they value their time very highly so it's not cheap if you have them place the books or pages onto the copy machines instead of you doing it. Also a lot of places will not copy them at all due to copyrights. If I wanted to do it myself the cheapest place that I found to make copies was at the public libraries.Depending on exactly what you're trying to do and how many copies of each one that you want, your best bet might be to buy a good copy machine and do it all yourself.

author: fzabkar
author_rank: Super Contributor
timestamp: November 17, 2024, 03:02:59 am
content: I have about 50 - 100 computer and peripheral service manuals from the 1970s and 1980s. I would dearly love to digitise them so that they could be saved for posterity. A friend scanned some of them using the document scanner at his workplace, but he has since moved on. I wonder if anyone knows of any service in Australia that would be willing to handle such a task?

author: fzabkar
author_rank: Super Contributor
timestamp: November 17, 2024, 03:06:37 am
content: Quote from: _rushin_or_draggin_ on November 16, 2024, 05:53:56 amYears ago, I used a glue binding service to turn my loose leaf pages into a book.https://theprint.blog/glue-binding/

author: Martian Tech
author_rank: Regular Contributor
timestamp: November 17, 2024, 03:11:59 am
content: You haven't defined what "a decent cost" is, so...How about lulu.com?
Any turning back from here? - Page 1
Forum section: electronics / repair

author: @rt
author_rank: Super Contributor
timestamp: March 11, 2021, 10:17:19 am
content: Hi, I have no idea how i happened, but it looks like the pad bent one way, and the IC leg the other way. I can clean it, so don’t mind that.It’s oxidised lead free solder which wouldn’t wet to attach wires, so I blobbed leaded solder over it and sucked it up. Maybe the recoil from the spring loaded sucker hit it, and probably too hot.I was thinking of either scoring the part of the pad nearest the adjacent leg. It’s not actually connected, but too close for comfort.Another approach might be to slot a blade in there, and try to move it when heated again.

author: Psi
author_rank: Super Contributor
timestamp: March 11, 2021, 10:29:57 am
content: Assuming the pad is still held on by a trace you should be able to move it back into place while it's hot and covered in flux.It's usually pretty easy to bend a leg back.They don't usually snap off with a single bend and bend back. It usually takes more than that.

author: RayRay
author_rank: Frequent Contributor
timestamp: March 11, 2021, 12:02:42 pm
content: You could simply scrape off the area to the left of it a little (to expose the copper on the board) with a flat screwdriver or a boxcutter, then clean it up with alchohol, and solder up a leg of a component to it (or a wire, and then solder it to the component). See this as an example:

author: brabus
author_rank: Frequent Contributor
timestamp: March 11, 2021, 12:24:24 pm
content: I would just bend everything back in place with a pair of sharp tweezers. Seen worse than that!
Any valuable info here?? - Page 1
Forum section: electronics / repair

author: mcjeff93
author_rank: Newbie
timestamp: June 15, 2025, 02:13:48 am
content: I've got a SMPS with the two IGBT's shorted. A loose transistor mounting clip caused a short in the device which blew the IGBT's. They are the OnSemi SGL160N60UFD, the problem i have is that this part is obsolete. I'm having a hard time finding a equivalent part, what could be a drop in replacement for this part?

author: Psi
author_rank: Super Contributor
timestamp: June 15, 2025, 02:54:23 am
content: Some options digikey found which might be ok from a quick look.I'm definitely not an expert in IGBT's so wait for someone else to have a look before ordering.IKQ120N60TXKSA1https://www.infineon.com/dgdl/Infineon-IKQ120N60T-DS-v02_02-EN.pdf?fileId=5546d46249cd10140149d230bd094df7IXXK100N60B3H1https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/650/IXXK%2CX100N60B3H1.pdfOne thing I noticed was the turn-off delay / fall time is quite small on your SGL160N60UFD (90ns turn-off typ)Where as IXXK100N60B3H1 is 120ns and IKQ120N60TXKSA1 is 310ns.May or may not be an issue depending on the speed they are being used at in the SMPS.IXXK100N60B3H1 is probably a safer fit as it's a bit higher spec, but costs more and still not perfect, would be nicer to find one with closer timing specs.You might want to check the IGBT gate driver IC's are ok, sometimes they blow up when the transistor does.You don't want to blow up new IGBTs given they are not that cheap.Check if the gate drivers are shorted to anything with the IGBT removed.Might also be able to power it on without the IGBTs and check with scope if the gate drivers are trying to control the IGBT or not, but will depend on the exact circuit

author: fzabkar
author_rank: Super Contributor
timestamp: June 15, 2025, 03:19:23 am
content: https://lcsc.com/product-detail/IGBT-Transistors-Modules_onsemi-SGL160N60UFDTU_C11757.html

author: Psi
author_rank: Super Contributor
timestamp: June 15, 2025, 03:21:03 am
content: yeah, much better option to use the correct chip, even if it is from LCSC, probably still the best plan.
Anybody get the digital amps in the speakercraft mzc66 to work outside the units - Page 1
Forum section: electronics / repair

author: Nicolas Ruiz
author_rank: Newbie
timestamp: January 29, 2023, 06:31:10 pm
content: Datasheet for the tda 8920bth shows mode pin needing 5 volts to activate amp and oscillator pin with 30kohm resistor between neg VSSa and oscillator pin. I take it means -12 volts with 30k resistor to osc pin. The rest is obvious +-25 volts on pin 1 and 2 of amp module ground on pin 3, oscillation on pin 4 and mode on pin 5. Is this correct? So if does not work the module is fried and needs repair?

author: bidrohini
author_rank: Regular Contributor
timestamp: January 30, 2023, 01:09:09 am
content: Looks like you have completed all the connections according to the TDA8920BTH datasheet. If still it is not working, probably the IC is damaged. However, before tossing it off, I believe it will be better to double-check your connections. For example, the continuities of wires, measuring voltages in each pin with a multimeter etc.
Anybody get the digital amps in the speakercraft mzc66 to work outside the units - Page 1
Forum section: electronics / repair

author: Nicolas Ruiz
author_rank: Newbie
timestamp: January 28, 2023, 03:09:11 pm
content: Datasheet for the tda 8920bth shows mode pin needing 5 volts to activate amp and oscillator pin with 30kohm resistor between neg VSSa and oscillator pin. I take it means -12 volts with 30k resistor to osc pin. The rest is obvious +-25 volts on pin 1 and 2 of amp module ground on pin 3, oscillation on pin 4 and mode on pin 5. Is this correct? So if does not work the module is fried and needs repair?

author: cantata.tech
author_rank: Regular Contributor
timestamp: January 28, 2023, 03:18:53 pm
content: Hard to know.The first logic test would be to put it back in the unit and test that it works still.Then you will know if it is fried or not.
Anyone experienced in repairing an onkyo tx-sr609? - Page 1
Forum section: electronics / repair

author: Tonymul
author_rank: Newbie
timestamp: October 15, 2019, 12:12:42 pm
content: Hi I’m new here and have an onkyo tx-sr609 that has a blown channel I have replaced the blown components but it instantly blew the new components:( please help

author: andy3055
author_rank: Super Contributor
timestamp: October 15, 2019, 08:13:24 pm
content: Sent you some info. Check your messages.

author: andy3055
author_rank: Super Contributor
timestamp: October 16, 2019, 05:59:11 pm
content: You do not say what parts are blown/replaced. If the outputs are blown, go down the line and replace the drivers and pre-drivers also. In an extreme case like this, what I would do is as follows:I assume no responsibility if you decide to do this!1. Remove power to unit and pull out all the faulty components. You can use your DMM to identify them.2. Power on and check the voltages at the critical points and compare to the good channel. This may be very difficult due to the way the power amp section is covered by the HDMI board! Probably, you can leave the HDMI board out to do this. You need a steady hand so you don't blow the good channel. If it is not possible, skip to below.3. Remove power and put in the new parts and fuses etc. Do not apply power yet.4. Start comparing the good channel with the bad channel using the DMM in ohm's scale. Check and compare the transistors C/B, C/E, B/E in both directions. Compare readings on the emitter and collector resistances. Etc. Etc.You are bound to find some difference at some point and that will lead you to faulty stuff.Please edit your profile to show where you are from!Thanks.

author: Tonymul
author_rank: Newbie
timestamp: October 20, 2019, 09:54:56 am
content: In the end I just ended up rebuilding the whole channel replaced everything that fixed it then

author: andy3055
author_rank: Super Contributor
timestamp: October 20, 2019, 02:29:35 pm
content: Quote from: Tonymul on October 20, 2019, 09:54:56 amVery often that would be the case. These direct coupled circuits destroy everything in the line when just one little thing goes bad. Glad it is working now.
Anyone expert on both PC & low level driver coding ? - Page 1
Forum section: electronics / repair

author: abdulbadii
author_rank: Frequent Contributor
timestamp: June 17, 2022, 02:41:40 pm
content: Anyone expert on both PC & low level driver coding at once ?this went from the unsolved issue/need posted many places or times on Linux forums as:Linux Command to represent plugging in USB so as to automaticaly get detectedAs plugging in USB automaticaly getting detected and run a firmware inside, what or how is the Linux command, in some condition USB is already being plugged in but really not being detected/recognized, to scan and recognize that USB to substitute the unplugging and then re-plugging in back action in order that USB automaticaly getting detected ?all stackexchange sites has no working solution nor the rest onesso if one expert on how/what actually triggers what component when a PC USB-A port is being mated with its female connector/plug counterpartthis specific my case is wifi adapter ie. external wifi cardthen after it's detected which driver actually will get invoked to register to OS and really take effect and low level command/function can represent them all: start re-scan all again to detect/register all USB, re-initialize again on that's not initialized, run the code prepared in the plugging ware

author: tooki
author_rank: Super Contributor
timestamp: June 19, 2022, 04:46:51 pm
content: I am having no trouble finding lots of pages with solutions (I won’t test them since I don’t have Linux set up and don’t care to do so).Here are a few:https://www.linux.org/threads/resetting-the-usb-subsystem.10404/http://billauer.co.il/blog/2013/02/usb-reset-ehci-uhci-linux/
Anyone familiar with aligning the contact image sensor (CIS) in a scanner - Page 1
Forum section: electronics / repair

author: mpmarquez
author_rank: Newbie
timestamp: May 08, 2025, 08:44:14 pm
content: I recently changed the feed and exit rollers in a Fujitsu ScanSnap 1500M scanner because they became gummy. I tried to do both the disassembly and reassembly very carefully and place all the delicate components in brand new antistatic bags to keep everything clean. After I reassembled the scanner I noticed that the front scan image has light blue/cyan streaks on the left side and wherever the text is black it is scanned as red. The back side scan of a duplex scan is perfectly good. So I have found comments that in general this can be caused by glass that isn’t clean. But I tried ChatGPT and it claims that the likely cause is that I misaligned the contact image sensor (CIS) during reassembly. In this case the sensor is spaced some distance from a lens so I wouldn’t technically say it was in contact with the front glass. This board had a loose fit and nothing to force alignment. But I had taken pictures before the disassembly and I tried to position it as close as possible during reassembly. I didn’t realize that you didn’t have to disconnect the sensor from the len’s assembly to access the feed roller. I can still use the back side scanner so it isn’t a deal breaker but I am trying to figure out how to recalibrate it without just randomly moving the sensor board around. Since the sensor board has quite a bit of slop on its exact mounting position and it must vary from unit to unit I assume Fujitsu uses software to calibrate it which probably is not available to the user. I was curious if anyone else had experience with this type of issue?

author: amyk
author_rank: Super Contributor
timestamp: May 09, 2025, 03:41:18 am
content: I'm not familiar with how that model works, but if it scans both sides at the same time and only one side isn't right, then that means the other side is aligned correctly. It may not even be alignment. I'd try scanning some test images like pure white, black grid, red grid, blue grid, green grid, etc. to determine exactly how the defect manifests. Post some pictures of the assembly and the results you're getting if you'd like more details.
anyone found and done temperature adjustable digital circuit assembly in iron? - Page 1
Forum section: electronics / repair

author: marhuum
author_rank: Contributor
timestamp: October 08, 2025, 07:39:39 am
content: Has anyone found digital temperature adjustable module circuit on market and done finishing complete assembly into a solder iron?If so please sincerely share us the experiences from which we'll make very good use on condition it's a clear, simple yet complete informative explanation, in the right order stepsIn market here no such digital, only potentiometer or variable resistor one, and no one has told sotry how it's done correctly completelyThanks before

author: rvalente
author_rank: Frequent Contributor
timestamp: October 08, 2025, 02:47:32 pm
content: T12 irons and their controller are relatively cheap, also the good old Hakko 906/907 clones are pretty god as well.Can you just buy them?
Anyone has Yamaha RX-V485 Service manual? - Page 1
Forum section: electronics / repair

author: abhilashkrishn
author_rank: Newbie
timestamp: September 22, 2020, 07:40:31 pm
content: Could you please share the service manual for RX-V485. My receiver is not turning ON.

author: Voxman
author_rank: Contributor
timestamp: October 25, 2020, 08:11:16 pm
content: If no one has sent you a link for service manual, here is one website that has it.https://elektrotanya.com/yamaha_rx-485_485rds.pdf/download.htmlGood luck!Gary

author: akimpowerscr
author_rank: Regular Contributor
timestamp: October 25, 2020, 09:40:23 pm
content: RX-485 and RX-V485 are not the same products.

author: SpecialK
author_rank: Regular Contributor
timestamp: October 25, 2020, 11:33:18 pm
content: Well that's not an old model, it's a current model released in 2018 it seems. Are you sure you cant get it repaired under warranty?

author: SpecialK
author_rank: Regular Contributor
timestamp: October 27, 2020, 02:51:46 am
content: Maybe look at an older model. The power supply board is likely very similar.https://elektrotanya.com/yamaha_rx-v481_htr-4069_rx-v481d_sm.pdf/download.html

author: Pat P.
author_rank: Newbie
timestamp: October 27, 2020, 03:45:40 pm
content: Dave did a repair on a rx-v557 a while back. was a bad cap in the power supply that kept it from turning on.could be a similar issue.

author: mzacharias
author_rank: Frequent Contributor
timestamp: October 28, 2020, 02:39:01 pm
content: Quote from: akimpowerscr on October 25, 2020, 09:40:23 pmIf you don't have it yet, email me atmark_zacharias@sbcglobal.netAnd I'll send it to you.
Anyone have a BCM60321 datasheet? - Page 1
Forum section: electronics / repair

author: Thermoelectric
author_rank: Contributor
timestamp: April 03, 2020, 07:13:07 am
content: Hey all,Got some powerline ethernet adapters recently, and one's doing some weird things. Could just RMA them but that takes the fun out of it. The button on the unit seems to get me into some manner of programming mode or whatnot, but deciphering the 3 LED's without any documentation is near on impossible. Anyone happen to have a datasheet for the BCM60321?Cheers.
Anyone have a picture of a Signadyne H3353/ Keysight M3201A/M3202A? - Page 1
Forum section: electronics / repair

author: DaJMasta
author_rank: Super Contributor
timestamp: May 18, 2020, 09:18:55 am
content: I have a Signadyne branded H3353 PXIe AWG that has suffered some physical damage to the back of the board and has sheered off a part, so I was hoping someone would have a card they could get the IC code off of or if someone could come up with a valid one from the few pictures available.The IC is U29 on the back of the board with the connector (exposed side on the left side of the module), it's a little SOT-23-5 package IC with a smallish SMD inductor and a couple caps right next to it, and best guess I think it's a boost converter (it's definitely some kind of switchmode converter). Pin 2 is ground, pin 5 connects to both caps and one end of the inductor, the other end of the inductor is 94 ohms to a different power rail, but I haven't verified the connection on the chip itself (could be damaged traces from the part ripped off, other parts have been damaged this way). I've found two fairly high resolution pictures from ebay listings of the back of the board which look to be an identical layout as mine, but the clearer picture appears to have a device code of "718C", but I haven't been able to match it to anything, and it's blurry enough I could be missing something.If someone has a card and could confirm or could find a datasheet from the number pulled off the images, I'd love to attempt a repair - the damage seems to be just some scraped off parts on this board and the card should be quite capable.
Anyone have a Raspberry Pi ? - Page 1
Forum section: electronics / repair

author: Hextejas
author_rank: Frequent Contributor
timestamp: November 08, 2023, 10:25:38 pm
content: I have one that I think that the onboard ethernet port is no good.How do I go about testing it if possible?Another thing is how do I get out to a terminal mode ?I have not been able to figure out how.Oh yeah, it is running Kodi/OSMC

author: wasedadoc
author_rank: Super Contributor
timestamp: November 08, 2023, 10:42:45 pm
content: You are more likely to get better help by posting at forums.raspberrypi.com.

author: Hextejas
author_rank: Frequent Contributor
timestamp: November 09, 2023, 08:37:00 pm
content: Yeah I have been trying there and I cant get past their stupid captcha. let me keep trying.thanks

author: CJay
author_rank: Super Contributor
timestamp: November 10, 2023, 07:53:38 pm
content: Quote from: Hextejas on November 08, 2023, 10:25:38 pmUmm, get SD card, image it with a fresh OS from the Raspberry Pi site, grab an ethernet cable, plug your Pi into your router, see if it picks up an IP address?

author: Audiorepair
author_rank: Frequent Contributor
timestamp: November 10, 2023, 08:33:00 pm
content: Maybe they're trying to keep you out.If you can't crack a Captcha then maybe you have no chance with a Raspberry Pi.

author: CJay
author_rank: Super Contributor
timestamp: November 11, 2023, 08:07:36 am
content: Quote from: Audiorepair on November 10, 2023, 08:33:00 pm
Anyone have an idea what this is? (SMD part identifying) - Page 1
Forum section: electronics / repair

author: Sarcarean
author_rank: Contributor
timestamp: July 08, 2022, 08:32:49 am
content: This 3-phase controller board has a few of these, I have some guesses but nothing definitive. Has anyone seen these before? And if so, any part numbers I could reference and research?

author: Uunoctium
author_rank: Frequent Contributor
timestamp: July 08, 2022, 08:40:51 am
content: maybe a kind of bare die semiconductor...https://www.centralsemi.com/files/manager/Marketing/Literature/Bare_Die_Product_Guide.pdf

author: abdulbadii
author_rank: Frequent Contributor
timestamp: July 08, 2022, 04:10:45 pm
content: Any supporting picture else, other side just plain not a circuit trace at all?

author: free_electron
author_rank: Super Contributor
timestamp: July 08, 2022, 04:18:47 pm
content: power mosfets, bare die, direct wirebond to substrate. not easily identifyable. only known to device manufacturer

author: abdulbadii
author_rank: Frequent Contributor
timestamp: July 08, 2022, 04:34:17 pm
content: so wonder the golden etching is pure gold or copper, or mix?isn't it usually B E is short in comm. E config. ?

author: free_electron
author_rank: Super Contributor
timestamp: July 08, 2022, 05:08:06 pm
content: soft gold, possibly over paladium to bond the wires ultrasonically

author: Sarcarean
author_rank: Contributor
timestamp: July 14, 2022, 09:12:50 am
content: Its a single sided board on aluminum. My initial thought, was this was some kind of passive that would dissipate heat from the pads which some of them have +24V.
Anyone have firmware of chroma 6314A ? - Page 1
Forum section: electronics / repair

author: f14
author_rank: Regular Contributor
timestamp: August 19, 2021, 02:28:03 am
content: Hi All,I'm currently upgrade my chroma 6312A to 6314A mainframe ( a newer A verison). So I need fw of U103 from 6314A .I'm appreciated for provide me this fileThank you!

author: peter1980s
author_rank: Newbie
timestamp: August 19, 2021, 03:36:46 am
content: well，i have several pcs，including 6314 and 6334.but u should first tell me,how to get the fw from u103,first.

author: f14
author_rank: Regular Contributor
timestamp: August 19, 2021, 12:32:04 pm
content: thanks for your replyyou need programer like Tl866 to read this file . in 6310A series chroma use tsop package so need ...desolder this.in older model 6310 series they use dip package with removable socketseem too risky for you
Anyone have iRobot Roomba 500/600 schematics? - Page 1
Forum section: electronics / repair

author: OpenCircuit
author_rank: Regular Contributor
timestamp: February 13, 2020, 05:25:36 am
content: Having problems with the left wheel module not moving forward and/or reverse. Wheel module tested good. Would like to isolate wheel drive circuitry. A lot going on on this PCB.

author: Carl E
author_rank: Regular Contributor
timestamp: April 13, 2020, 12:38:16 am
content: Hi,Not sure if this helps as its for the charging and supply circuits. I found this on the web... it helped me by pointing out the 2 mosfets, U2 and U4, P/N N3PF06 fail when trying to charge dead batteries. if you change 1 you should change both. I've fixed 3 Roombas by changing these Mosfets. Hope this helps.

author: gorge441
author_rank: Contributor
timestamp: April 13, 2020, 03:40:32 pm
content: Please check this,https://www.ifixit.com/Device/iRobot_Roomba_5xx_Series.I think it might help you
Anyone have National Semiconductor "HPC" User's Manual? - Page 1
Forum section: electronics / repair

author: Conventional Wisdom
author_rank: Contributor
timestamp: May 01, 2024, 05:25:12 pm
content: Hi folks,I'd like to help out a friend who needs to modify a 30-year-old system, the controller for which was a custom design based on the National Semiconductor HPC46003 CPU. The firmware change should be fairly easy, but the original designer is long gone, along with the documentation and source code (of course).Now, I'm a heck of a reverse engineer (see my HP548xx post), but I need more info on the CPU. Thanks to Bitsavers I've got the data sheet, lots of app notes, and an old DOS-based assembler and C compiler, and I've even written most of a disassembler for the HPC, but I'm missing a crucial document that's referenced by all the others:National Semiconductor Publication Number 424410897-001A July 1987"HPC16083/HPC16043/HPC16003 User’s Manual."It used to be available on National's "Dial-a-Helper" BBS (remember those?) but I've searched everywhere on the web and can't find it. I even emailed Texas Instruments support, since they acquired all those NS CPUs, but they don't have it either. The User's Manual apparently has a lot more information about the peripherals and instruction set that isn't in the data sheet.My only hope is that someone will remember that they have a copy of it that's been collecting dust and cobwebs in a box in the attic since 1989.I really don't want to have to replace the controller entirely. Can anyone point me to this manual? Thanks for reading!

author: Conventional Wisdom
author_rank: Contributor
timestamp: September 26, 2024, 03:54:15 pm
content: Bump. Still interested. Thanks!

author: whonline
author_rank: Newbie
timestamp: June 01, 2025, 11:59:50 pm
content: Still Needed?I have the HPC16083/HPC16043/HPC16003 users manual along with the HPC C compiler and the Assembler/Linker/Librarian users manuals.I am pretty sure I also have the evaluation board stashed away. I would have to look for it.

author: amyk
author_rank: Super Contributor
timestamp: June 04, 2025, 06:12:45 am
content: Yes, of course! archive.org would be a good place to upload them.

author: whonline
author_rank: Newbie
timestamp: June 06, 2025, 11:38:25 pm
content: I have uploaded the documents to Archive.org.. They can be found with a search for "HPC,MOLE".I also uploaded the compiler, assembler, etc.Does anyone want the paper?

author: Conventional Wisdom
author_rank: Contributor
timestamp: July 27, 2025, 09:40:40 pm
content: Whonline,That user's manual is EXACTLY what I was looking for. Thank you so much for making it available!All the best -- CW
Anyone have Ono Sokki CF-350/360 Operation Manual Scanned or Paper (thick!) - Page 1
Forum section: electronics / repair

author: slbender
author_rank: Regular Contributor
timestamp: May 27, 2019, 09:18:12 pm
content: Need the to borrow the paper manual circa 1985-1990 for early spectrum of analyzer, or if scanned, emailed.Thanks,Steven

author: z80tw
author_rank: Contributor
timestamp: June 16, 2020, 04:13:24 am
content: Hi Steve,You could download it from Ono Sokki web site:https://www.onosokki.co.jp/English/hp_e/c_support/manual/fft.htmJack