hybridfree/eevblog-posts huggingface dataset:
SMD IC Identification - Page 1
Forum section: electronics / repair

author: haisumriaz
author_rank: Newbie
timestamp: March 10, 2024, 09:37:24 pm
content: Hi all am trying to repair a powebank, Its an Aukey PB-T11-V1. it is not giving output and when i press the power button to wake it up from sleep, it makes a buzzing sound and led flickers for a split second. no visible sparks nor arcsi found a burnt SMD IC but cant identify it. it is an 8pin smd around 4mm x 2mm in size. the IC has following marking:N04 PGZ69*2nd number is either a 0 or oZ might be a 2 not sure on that either* is another number or character but it is chipped awayif you see teardown videos on internet you can spot the ic under the orange usb portcan someone guide me about the ic? let me know if any more information is required.

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 10, 2024, 09:48:24 pm
content: Not sure if a 0 or o.... Z might be....How about apicture?Seems to be a QC 3.0 charge controller.https://lygte-info.dk/review/USBpower%20Flypower%20QuickCharger%20PS18Q090K2000EU%20UK.htmlCheck the list of QC 3.0 controllers inAccessory_List_QCOM_Quick_Charge.pdf, page 15.

author: fzabkar
author_rank: Super Contributor
timestamp: March 10, 2024, 10:31:21 pm
content: FYI ...Datasheet for INN2215K:https://www.power.com/downloads/documents/innoswitch-cp_family_datasheet.pdfArchived teardown:https://web.archive.org/web/20170321151653/http://lygte-info.dk/review/USBpower%20Flypower%20QuickCharger%20PS18Q090K2000EU%20UK.htmlhttps://web.archive.org/web/20180204133318/http://lygte-info.dk/pic/USB%20PS/104%20Flypower%20QuickCharger%20PS18Q090K2000EU/DSC_7816a.jpg(photo)The mystery IC could be functionally equivalent to CHY103D in the INN2215K application circuit:https://www.mouser.com/datasheet/2/328/CHY103_family_datasheet-770737.pdf

author: haisumriaz
author_rank: Newbie
timestamp: March 11, 2024, 09:03:10 pm
content: Sorry for such poor quality, this was the closet i could get without loosing focus.First one is a picture of IC, second one is the part of the circuit.The power bank was QC 3.0 supported and this port was the "Fast Charging" i guess it might be actually be related to QC.Still I'm clueless to what exactly is this IC any more information will be helpful.Let me know if any further information is required to identify it.
SMD IC Replacement advice - Page 1
Forum section: electronics / repair

author: mr.fabe
author_rank: Regular Contributor
timestamp: October 23, 2022, 05:21:39 am
content: Greetings,I am looking for some guidance with replacing a IC chip that appears to be faulty. Specifically, it is TPS53515 chip and its size is smaller than anything I have worked on in the past. My thoughts are to remove the larger inductor first for better access but I was concerned about the adjacent caps and resistors flying away. For replacement, I was planning to use solder paste T5 at low air flow to mount replacement chip.Any thought or suggestions on this?Thanks!

author: ataradov
author_rank: Super Contributor
timestamp: October 23, 2022, 06:16:55 am
content: I would suggest to find a junk board and practice.I personally would be worried more about removing that inductor than replacing the IC. Keep it on the board. Other components should not fly either if you do it right, so again, practice first on a board you don't care about.
SMD ID Hall effect - Page 1
Forum section: electronics / repair

author: Wiljan
author_rank: Regular Contributor
timestamp: August 18, 2022, 07:51:14 am
content: Trying to find a Torqueedo remote shuttle control which does use a hall sensor as "Dead man switch" so if the magnet are removed it will stop.The problem is the unit stops now and then while the magnet are still in place (can be moved like 10mm and still accepted so gauss but be fine) I then suspect the hall sensor itself to have a periodic error.So I'm looking for manufacturer / part number for a very small SMD effect sensor (North/South) non latching 6 pinsmd code "717 372 95"Hope someone know where to find a cross table from SMD => part number

author: gamalot
author_rank: Super Contributor
timestamp: August 18, 2022, 09:44:23 am
content: A1395SEHLT-Thttps://www.allegromicro.com/-/media/files/datasheets/a1391-2-3-5-datasheet.pdf

author: Wiljan
author_rank: Regular Contributor
timestamp: August 18, 2022, 10:29:26 am
content: Quote from: gamalot on August 18, 2022, 09:44:23 amPerfect :-)From datasheet:YWWLLLNNY = Last two digits of year of manufactureW = Week of manufactureL = Lot numberN = Last two digits of device part numberNN= 95 and there is a match, how did you know it was AlLegro?

author: gamalot
author_rank: Super Contributor
timestamp: August 18, 2022, 10:47:55 am
content: Quote from: Wiljan on August 18, 2022, 10:29:26 amI searched for the keywords "霍尔" (Hall in Chinese) and "DFN" on taobao.com, and there were A1391SEHLT-T and A1393SEHLT-T on the first page of the search results.

author: Wiljan
author_rank: Regular Contributor
timestamp: August 18, 2022, 12:09:46 pm
content: Quote from: gamalot on August 18, 2022, 10:47:55 amGreat idea, thank you for clarifying

author: fzabkar
author_rank: Super Contributor
timestamp: August 18, 2022, 05:41:57 pm
content: This is one case where viewing this IC in the context of its surrounding ICs would have helped to determine if "717" was the date code.Edit:I tried a similar search with Google and found Allegro A1395SEHLT-T on the first page of results:https://www.google.com/search?q="hall+effect"+dfn&tbs=isz:m,itp:photo&tbm=isch
smd ident   A2  43  markings what is it  - Page 1
Forum section: electronics / repair

author: pcmad
author_rank: Regular Contributor
timestamp: October 17, 2021, 12:39:37 am
content: smd identA243markings what is itsmd has 2 terminals and has a line on one side

author: amyk
author_rank: Super Contributor
timestamp: October 17, 2021, 06:18:00 am
content: Pictures please...?

author: asis
author_rank: Frequent Contributor
timestamp: October 17, 2021, 07:34:43 am
content: Hi,See table on page 2.https://datasheetspdf.com/pdf-file/815237/AgilentTechnologies/HSMS-2802/1

author: abdulbadii
author_rank: Frequent Contributor
timestamp: October 18, 2021, 10:53:36 am
content: Diode, don't know the mysterious 43
SMD IDENT: "RHS AK" (SOT223) by ON Semiconsductor - Page 1
Forum section: electronics / repair

author: 9a6aag
author_rank: Contributor
timestamp: December 18, 2023, 12:28:39 am
content: Please, can you help me identify SOT223 SMD with marks; "RHS AK" by ON Semiconsductor?!?I am googling it for the last 2 hours and nothing even similar....i am clueless

author: fzabkar
author_rank: Super Contributor
timestamp: December 18, 2023, 02:00:48 am
content: Some context might help. Does it have a circuit reference? Can you show us a photo of the part and the PCB?

author: RoGeorge
author_rank: Super Contributor
timestamp: December 18, 2023, 02:05:38 am
content: Maybe the surrounding components on the PCB might give a clue what it might be. Usually I search inhttps://smd.yooneed.one/

author: 9a6aag
author_rank: Contributor
timestamp: December 18, 2023, 08:32:45 am
content: VT1 one pin goes on resistor R47- 1k, "common pin" goes over R22 to C9 positive pole, and third pin goes somewhere over through holes...UPS was completely dead...entire H bridge was burnt down, so as rectifying input part....after replacing all the mosfets and diodes, the UPS woke up and working, but power off by button doesnt work, it stays on and it doesnt switch to online mode when AC 230 mains is applied...so i guess the control logic of switching power on and off so as switching inverter mode is stil in malfunction so i did get to the RHS AK in SOT223 that turns to be all short...

author: 9a6aag
author_rank: Contributor
timestamp: December 18, 2023, 08:30:40 pm
content: UPDATE: this is PNP transistor (base-collector-emiter)....found on other UPS on same spot similar mark; RKS AH...but still, dont know the equivalent

author: fzabkar
author_rank: Super Contributor
timestamp: December 18, 2023, 09:03:26 pm
content: RKS = BFR194https://ae01.alicdn.com/kf/S42ef9df58b4d416a84af83d39640ac12v.jpg_640x640Q90.jpg_.webphttps://pdf.datasheetcatalog.com/datasheet/siemens/BFR194.pdfRHS = BFR183https://www.skytech.ir/images/S/11187-1.jpghttps://www.infineon.com/dgdl/Infineon-BFR183-DS-v01_01-en.pdf?fileId=db3a30431400ef68011426a1b8f80656http://markingcodes.com/search/c/rhshttp://markingcodes.com/search/c/rks

author: 9a6aag
author_rank: Contributor
timestamp: December 18, 2023, 09:09:29 pm
content: just found it as BCP53 with SMD mark AH...its a PNP transistor
SMD Identification Help: ANSX 11 - Page 1
Forum section: electronics / repair

author: citroen42
author_rank: Newbie
timestamp: January 02, 2025, 11:17:07 pm
content: Hi All,My Beolit15 has stopped charging the Li-Ion battery.Opening up the unit is is clear that Q5 is burnt badly, see attached photo.The SMD ID was barely visible but managed to identify it as "ANSX 11" (SOT-23), which is the same as Q4.I've looked in various places but not able to identify the component, are any of you able to help working out what it is?Thanks in advanceBrian

author: eb4fbz
author_rank: Regular Contributor
timestamp: January 02, 2025, 11:42:57 pm
content: AO3420?

author: citroen42
author_rank: Newbie
timestamp: January 03, 2025, 08:54:28 am
content: Thanks for the quick response eb4fbz!Your suggestion makes sense and I've confirmed the behaviour via Q4.CheersBrian
SMD marking D5V7P on SOT-23 - Page 1
Forum section: electronics / repair

author: JoeyG
author_rank: Regular Contributor
timestamp: April 10, 2025, 10:23:47 am
content: Looking to find out what the full.part number of this transistor is

author: adam7
author_rank: Newbie
timestamp: April 10, 2025, 11:53:00 am
content: It is SI2325DS-T1-GE3https://jlcpcb.com/partdetail/VishayIntertech-SI2325DS_T1GE3/C60773
SMD marking identification - Page 1
Forum section: electronics / repair

author: dagav
author_rank: Newbie
timestamp: August 02, 2022, 09:09:39 pm
content: Anybody who can help identify the SMD marking that seem to be WC6FG, in sot23-6 package?(componentdamage makes it dificult to read of marking) Searched around and the nearest I can find is SY8113BADC, but Im not sure. It belongs in a powersupply for a portable DAB radio.D.A.

author: fzabkar
author_rank: Super Contributor
timestamp: August 02, 2022, 09:51:13 pm
content: That looks like a suitable candidate (WCxyz):https://www.google.com/search?q=SY8113BADC&tbs=isz:m,itp:photo&tbm=ischhttps://www.avnet.com/opasdata/d120001/medias/docus/190/SIY-SY8113BADC-Datasheet.pdf
SMD marking identification - Page 1
Forum section: electronics / repair

author: dagav
author_rank: Newbie
timestamp: June 18, 2022, 05:55:21 pm
content: Hi,need help to indentify SMD component marked with 2290.RegardsD.A.

author: inse
author_rank: Super Contributor
timestamp: June 18, 2022, 06:17:12 pm
content: I have no idea.

author: gamalot
author_rank: Super Contributor
timestamp: June 18, 2022, 08:18:43 pm
content: Looks like MAAM-009100:https://cdn.macom.com/datasheets/MAAM-009100.pdf

author: fzabkar
author_rank: Super Contributor
timestamp: June 18, 2022, 08:52:21 pm
content: Quote from: gamalot on June 18, 2022, 08:18:43 pmAmazing. How did you find it?

author: gamalot
author_rank: Super Contributor
timestamp: June 18, 2022, 10:04:40 pm
content: Quote from: fzabkar on June 18, 2022, 08:52:21 pmI searched for RF devices in SOT-89 package at LCSC and I found some MACOM RF amplifiers that are very similar to the chip in the OP's picture. So I went to MACOM's website to try to find it. Unfortunately, although I found the MAAM-009100 that matches the peripheral circuit, there is no information about top marking in their datasheet, and I can't find any picture of it. That's why I can't say with confidence that it's MAAM-009100.

author: dagav
author_rank: Newbie
timestamp: June 19, 2022, 08:28:08 pm
content: Hi, I think it is the MAAM-009100, despite the missing markinginfo on the datasheet. So thanks alot "gamalot". It is 6 of them in a adjustable RF amplifier, originaly made by MACAB, a swedish company, but sold by a norwegian company as ELKO. It is very special solution(imo), used to amplify RF signal onto ethernetnetwork, using one of the pair, and a "balun" at each outlet, for connection to the TV. Since the PSU to this unit was dead, I suspected more damage on the amplifier, because a lot of noise on the outputs, when a new psu was connected. That can possibly be a matter of adjusting, we shall see. Since these units are not sold anymore, it has some value for the user to get it up and go again. Once again thanks for your help.RegardsD.A.
SMD Marking PAYI - Page 1
Forum section: electronics / repair

author: 2X
author_rank: Frequent Contributor
timestamp: January 18, 2024, 08:45:25 pm
content: Hello,I have an smd component with 5pin but I found in two different datasheet of the same company (Texas Instruments) this marking "PAYI"on two different part numbers. I can't understand which part numbe is the right. Also at the internet I found pictures with this marking at both part numbers. The only difference that I found is that some letters have below or under horizontal bars. Does the bars mean something?TPS2816DBVRhttps://www.ti.com/lit/ds/symlink/tps2819.pdf?ts=1705563023219&ref_url=https%253A%252F%252Fwww.mouser.in%252FTPS2819QDBVRQ1https://www.ti.com/lit/ds/symlink/tps2819-q1.pdf?ts=1705587616752&ref_url=https%253A%252F%252Fgr.mouser.com%252F

author: Vovk_Z
author_rank: Super Contributor
timestamp: January 18, 2024, 10:36:13 pm
content: 2016 has PAAI code and 2019 has PAYI code as seen from first datasheet. Second dataseet shows codes only for 2019 and 2029.

author: 2X
author_rank: Frequent Contributor
timestamp: January 19, 2024, 07:05:57 am
content: Quote from: Vovk_Z on January 18, 2024, 10:36:13 pmWhat is the right part number you think?

author: fzabkar
author_rank: Super Contributor
timestamp: January 20, 2024, 07:28:33 pm
content: I think the bars denote a date code.Your datasheet shows PAYI for TPS2819QDBVRQ1 and PAYQ for TPS2829QDBVRQ1. However, TI's lookup page produces confusing results.https://www.ti.com/packaging/en/docs/partlookup.tsp?partmarking=payqhttps://www.ti.com/packaging/en/docs/partlookup.tsp?partmarking=payihttps://www.ti.com/packaging/en/docs/partlookup.tsp?partmarking=paaiI think you should choose TPS2819 if your circuit requires Vdd on pin #1, or TPS2829 if pin #1 is NC.
SMD Micro USB Connector With Ortogonanal Front Profile - Page 1
Forum section: electronics / repair

author: 2X
author_rank: Frequent Contributor
timestamp: May 15, 2024, 06:01:26 pm
content: Hello,I have a damaged USB micro type port where his cover at the front is orthogonal and I would like to find the same. Do you know what is his name (if there is any for this specific type)?I have searched on Digikey, Mouser and Aliexpress but I didn't find anything with this shape.

author: ataradov
author_rank: Super Contributor
timestamp: May 15, 2024, 06:59:15 pm
content: This is USB micro A connector, which is distinct from a very similar USB micro B. This square shape is intentional, not just a design. So, search for "USB micro A" and you should be able to find it, since it looks like a very generic connector otherwise.I guess technically this is Micro-AB. This one seems to be similar to what you wanthttps://www.mouser.com/ProductDetail/Molex/47589-0001?qs=KKUMDL8WE1J88PqW%2FNep5w%3D%3D

author: selcuk
author_rank: Frequent Contributor
timestamp: May 15, 2024, 08:21:31 pm
content: If this is a device from China, it may be difficult to find the exact part number on Aliexpress. But you may search on with the device name & model + "micro USB" keywords.
SMD Part Question - Page 1
Forum section: electronics / repair

author: chick0n
author_rank: Regular Contributor
timestamp: March 03, 2020, 04:41:55 pm
content: HiCan anyone tell me what this part is called?I think its a 3 pin Resistor, with very low ohms.

author: KL27x
author_rank: Super Contributor
timestamp: March 03, 2020, 05:38:39 pm
content: I would call it a 3 ohm SMD bussed (having a shared/common pin; as opposed to "isolated") dual network resistor / resistor array.

author: chick0n
author_rank: Regular Contributor
timestamp: March 03, 2020, 06:14:08 pm
content: Cant find it anywhere...Can I build it myself out of two 3ohm resistors?

author: chick0n
author_rank: Regular Contributor
timestamp: March 03, 2020, 06:21:44 pm
content: Since this thing is in a RF Signalpath, I think it is a Chip-Attentuator. Maybe 3dB?

author: fcb
author_rank: Super Contributor
timestamp: March 03, 2020, 06:51:12 pm
content: It's a 3dB (50ohm) attenuator. Susumu make them.

author: chick0n
author_rank: Regular Contributor
timestamp: March 03, 2020, 08:56:22 pm
content: Yep...its from Susumu.AND I can buy Replacement:https://www.arrow.de/products/pat1220-c-3db-t5/susumu
smd precision resistor "paint layer" peeled off while soldering  *** advice need - Page 1
Forum section: electronics / repair

author: rodd
author_rank: Regular Contributor
timestamp: October 19, 2020, 08:11:39 pm
content: Dear all,I was doing a A5 board repair of a Tek2465BCT I bought some time ago.This is a late unit, serial # B0577746 and the A5 board is the 671-0965-05.I inspected the board when I bought the unit and there were no signs of corrosion, so I left it as received for quite a long time.It seems the caps have been replaced ( I can't say for sure) but the board was not cleaned well enough so the corrosion started.Near the ADC (U2101) the only pads "missing" are the ones for C2520, but I had to remover and solder again some SMD components in this area.While doing this the "paint layer" of R2012 (RES,FXD,FILM:10KOHM,0.1%,0.125W,TC=T9) fell off, exposing the tiny traces.I could not find a direct replacement for it so I am thinking of leaving it there and apply a layer of some isolating material (PCB varnish, for example).My question is: Is it possible the the varnish would react with the exposed traces, changing the component characteristics?|Is it better leave the component as it is? Any other coating material suggested?Thank you in advance,Roger

author: drvtech
author_rank: Regular Contributor
timestamp: October 19, 2020, 11:01:47 pm
content: I think you should coat it with a varnish or conformal coating, but one which is specifically designed for use on electronic components. And you should be sure it is scrupulously clean first. If you don't then water vapour and anything else in the air will eventually react with the resistive element, changing its value at least. If it's a precision resistor then presumably a close tolerance is required otherwise a standard part would have been specified.
SMD soldering two questions - suggested paste and rework approach w/o stencil - Page 1
Forum section: electronics / repair

author: wb0gaz
author_rank: Frequent Contributor
timestamp: June 23, 2022, 01:32:59 pm
content: I'm pretty new at SMD soldering, working mostly with QFP (0.635mm pitch) packages.Two questions:1. Looking for recommendation for a 63/37 paste that's somewhat sticky/tacky flux; the paste I'm using (no-name from china) is close to liquid which makes it hard to tidy up paste after application but before hot air soldering (I try to guide it to where it should go and have it stay in place to make application more even; even with a stencil this solder oozes all over the place) and also hard to get the part itself into position without it seeming to slide around (as if the flux is acting too much like a mechanical lubricant.)2. How is rework handled when the part needs to be replaced and the original stencil (I've been using proto-advantage type single-part stencils to apply solder for initial assembly when the part is the first thing going on to a blank board) can't be used due to obstructions from other parts? For rework, I've been hand applying solder paste (tiny needle) and that brings me back to the first question - controlling amount/placement with adequate precision (I do this under a kid's stereo microscope that's worked well as a tool) to reduce risk of bridges (which I clean up after the fact with solder wick) and necessity of touch-up by soldering iron.Thanks for advice/pointers!Dave

author: tautech
author_rank: Super Contributor
timestamp: June 24, 2022, 05:18:20 am
content: Right or wrong don't matter only what works best for you.Many times I have pointed to the video in this post as a quite different approach:https://www.eevblog.com/forum/beginners/so-surface-mount-it-is/msg1442590/#msg1442590The whole thread is worthy of a study.
SMD SOT23-5 Please help me identify component - Page 1
Forum section: electronics / repair

author: radcza
author_rank: Newbie
timestamp: December 07, 2020, 11:26:48 pm
content: HI.Can I please for help in identifying the following SMD component? Package is SOT23-5. Marking isbPCGD. Probably is voltage detector or regulator but I dont know the ecaxt parameters. It is a component of mainboard IP camera YI YHS3017.I add photos of the mainboard. Pinuot 3 is connected to a nearby coil, pinout 2 is ground, pinout 4 is voltage from power supply (VIN +5V) and pinout 1 is probably VOUT. I`ve looked in many catalogs but it is probably a unique label of the manufacturer. I've been looking for this information for several days. I wonder what is means small letter "b" on the marking? Its means country of production or manufacturer designation? Thank for your help!

author: wraper
author_rank: Unknown
timestamp: December 07, 2020, 11:34:05 pm
content: Looks like buck converter.

author: fzabkar
author_rank: Super Contributor
timestamp: December 07, 2020, 11:56:11 pm
content: I suspect that pin #5 is the feedback pin. If so, then there should be two resistors connecting to this pin -- one to ground, the second to Vout. Measure the voltage at this pin. That should make it a little easier to find the IC. A typical feedback voltage is 0.6V.
SMD SOT23 transistor identifying - Page 1
Forum section: electronics / repair

author: ffor
author_rank: Newbie
timestamp: September 09, 2021, 02:45:59 pm
content: Hi,I'm trying to identify transistor - marking code 361B6 / 36186, from inverter mainboard.Thank you for your time,Michael

author: TurboTom
author_rank: Super Contributor
timestamp: September 09, 2021, 04:00:58 pm
content: Fairchild / Onsemi FDN361BN?? Not too sure, though... The cap between pin 1&2 confuses me a little.

author: gamalot
author_rank: Super Contributor
timestamp: September 09, 2021, 04:46:40 pm
content: Quote from: TurboTom on September 09, 2021, 04:00:58 pmI found this, so I believe you are right.

author: fzabkar
author_rank: Super Contributor
timestamp: September 09, 2021, 07:05:39 pm
content: http://www.smdmark.com/en-US/search/code?id=361
SMEG SE708 thermal cutoff - Page 1
Forum section: electronics / repair

author: justaguy
author_rank: Contributor
timestamp: January 03, 2023, 08:56:26 am
content: While repairing a SMEG SE708NE electric oven, I noticed that the thermal cutoff switch is hanging loose from the mains wire. It does not feel right to me, must have been left like that from a previous repair. I´d like to put it back in place but I cannot figure out the exact location, as I don´t see any suitable screw or metal clip where it could be secured. Can anybody help, maybe with a drawing or a photo?
SMIQ 03B upgrade firmware error - Page 1
Forum section: electronics / repair

author: no_one
author_rank: Newbie
timestamp: October 15, 2022, 03:19:10 pm
content: Hi everyone,SMIQ 03B using WinFlashPro to update the firmware will stop at half, as shown in the picture。sometimes it will prompt “Program File = SM3_1”. and will stop here。I am using RS232 to update。what is the problem?

author: drhex
author_rank: Regular Contributor
timestamp: October 17, 2022, 10:04:27 pm
content: The flashing software is pretty sensitive to its environment, had to buy an old laptop with serial port and install win2k to get it to work reliably.

author: no_one
author_rank: Newbie
timestamp: November 11, 2022, 04:57:56 pm
content: Quote from: drhex on October 17, 2022, 10:04:27 pmThanks Reply! What is the difference between USB to RS232 and built-in RS232? The update is half stuck, WinFlashPro will show "Not Responding"！what is the reason?

author: Jarek
author_rank: Regular Contributor
timestamp: November 11, 2022, 08:39:17 pm
content: HalloHere is a similar threadhttps://www.eevblog.com/forum/repair/rs-sme03-firmware/msg3516030/#msg3516030

author: edpalmer42
author_rank: Super Contributor
timestamp: November 11, 2022, 09:13:52 pm
content: Quote from: no_one on November 11, 2022, 04:57:56 pmOfficially, RS-232 voltage levels must be +3V or higher and -3V or lower. But most USB to RS232 converters use TTL/CMOS levels in the range of 3 - 5 volts and ground. Most equipment accepts this, but some get confused. I don't know if R&S equipment gets confused, but that's the first thing that I would check.Ed
SMIQ03 Fatal Error-CPU.Var Invalid - Page 1
Forum section: electronics / repair

author: Cristian2020
author_rank: Newbie
timestamp: April 18, 2023, 01:22:50 pm
content: Hi,In the process of changing the display glass of my smiq03 (That became to green to see something) with some plastic i decide to copy the content of the boot EPROM from the controller module .I said that is a good opportunity to make-it available to the community and also take a look of a way to enable some options (BER test was one of them). Unfortunately because of the mixing of activities i end up starting the instrument without the EPROM fully inserted in the PLCC socket.Then the instrument boot up with this error. Fully inserting the EPROM in the socket did not make the instrument boot again.Additional investigation using the service manual reveal that there is a hardware configuration for the CPU module programed with some resistor connected at D4 port IC.Hooking up the Logic analyzer reveals that no read is done to this IC up to the error take over.Reading the CS_REG5 line from D510 using the LA shows that the address lines in order to assert CS5 never gets asserted,so it means that the software gets stuck in the boot process before reading this configuration.I do not have other leads to follow (other then suspecting that the CMOS got corrupted in the process somehow ) or there is an error in the hardware address/data decoding that make the software read something else (but on the other side the LCD gets initialize properly ). Also trying to load a new software in flash by the R&S utility for SMIQ does not work neither.I will be very grateful for any suggestion and if anybody has the content of the Eprom copied so i can transfer to some flash equivalent so i can test if it will change the behavior it will be excellent.As a side note the controller has the additional RAM module board populated.I attached the screen capture with the error and also a picture with the sticker from CPU module to identify the Major/Minor Version.Regards

author: KeBeNe
author_rank: Regular Contributor
timestamp: June 02, 2023, 01:28:34 pm
content: Hi,it's a bit older, but could you read the data from the EEprom?If so, did you try to use a newly written one?I have some parts here and could do some comparative measurements if that helps.

author: Swake
author_rank: Frequent Contributor
timestamp: June 03, 2023, 06:41:53 am
content: Assuming you somewhat dismantled the device to get to the EPROM. Have you verified that everything is plugged back in correctly and makes good contact. You might want to redo it: take it apart again and rebuild. Clean all contacts. It is worth the try.You write the EPROM was not fully inserted. Could it be that it somehow made some shorts or connected lines that should not have been connected? Is it well inserted now? No bend pins or the like in the socket? I remember those PLCC sockets having their own mood sometimes...As it seems the boot process is not successful, on a 'normal' computer I would suspect a RAM issue and swap that. Is that at all possible on this device? Maybe try removing the additional RAM board and anything else that was optional.
SMIQ03 Repair Error 180 - Page 1
Forum section: electronics / repair

author: Seint
author_rank: Newbie
timestamp: February 04, 2024, 03:56:59 pm
content: Hi,My SMIQ03 fails internal calibration and gives 180 Error. Has anyone have any idea how to fix it?Also, when I run internal calibration for VECTOR MOD & LEV ATT it fails the calibration giving this error:"Error: reference voltage oot (6.0 .. 12.0)".

author: R-1125F
author_rank: Regular Contributor
timestamp: February 05, 2024, 09:48:31 pm
content: What have you done so far? Check power supply voltages? Check batteries? (SMIQ03B has three batteries).

author: Seint
author_rank: Newbie
timestamp: February 05, 2024, 11:11:04 pm
content: Quote from: R-1125F on February 05, 2024, 09:48:31 pmBatteries seems to be OK. Just went through the test points according to the service manual Vol 1, and found some are not within the range. Please see attached. Don't really know where to start...

author: lcharman
author_rank: Newbie
timestamp: September 11, 2024, 02:15:40 am
content: I have the same problem.May I ask if you have any idea or founding?

author: oe7dbhnew
author_rank: Contributor
timestamp: January 02, 2025, 11:33:35 am
content: Hi Gays .....Happy new YearI have almost the same problem, I get the message:Error: nominal Level ootError 180 Calibration failed Level presetOf course, according to this, the measured output power is by no means the same as the value shown on the display,e.g. the absolute output power is just 3mW despite the +16dBm setting.I would also be grateful for some good information that will lead to success.Vy 73 de OE7DBHDarko
SMIQ03B Frequency offset - Page 1
Forum section: electronics / repair

author: Aleksandar
author_rank: Contributor
timestamp: April 20, 2022, 01:12:22 pm
content: Hello to everyone,On my SG I noticed that in the frequency range from 0.3MHz to exactly 450.000MHz I have a frequency shift plus 133.570MHz, plus/minus error of the counter.450.001MHz and up to 3GHz is true, but at 450MHz, the counter shows 583.570MHz! And all below that frequency.Or for example for 100MHz, I read 233.570MHz on the counter.I also checked everything on the TEK 492 spectrum analyzer. The amplitude is OK.Does anyone have any advice where there may be an error?ThanksAleksandar

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: April 20, 2022, 01:31:30 pm
content: Take a look at the IQ-Modulator board.The block diagram and schematics for that board are available here:http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Rohde_SchwarzThe board is described in service manual vol.2 page 185ff

author: Aleksandar
author_rank: Contributor
timestamp: April 20, 2022, 04:09:36 pm
content: Thanks for starting the problem search.Although I would like to get some more concrete advice?

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: April 20, 2022, 04:56:01 pm
content: There are troubleshooting checklists.Check everything around the 2.4 GHz LO.Checklist items 7.4.4.7 and 7.4.4.8

author: Aleksandar
author_rank: Contributor
timestamp: April 20, 2022, 07:12:40 pm
content: Thank you very much.I solved the "malfunction".A very banal thing. The last time I changed the battery, I somehow disconnected the cable coming from the Reference / step synthesis module. I marked with a red circle. Now I opened the SMIQ from the bottom, intending to start fixing it and immediately saw what happened.Thanks again for the help. Without her, I wouldn't have started repairing.

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: April 20, 2022, 08:20:33 pm
content: Nice! Always good to see test equipment working again.

author: Aleksandar
author_rank: Contributor
timestamp: April 20, 2022, 08:39:53 pm
content: Yes, that's right. But at that time I was doing something on 1296MHz and it was all good.Maybe this will be useful for someone!Thanks again.
SMIQ6L - wrong freq. at output - [SOLVED] - Page 1
Forum section: electronics / repair

author: piotrekjan
author_rank: Contributor
timestamp: March 01, 2020, 03:39:24 pm
content: Hi All,I've killed accidentially my SMIQ6L. Not sure how I've done it, as I've removed covers and front display module and then installed these back, but now unfortunatelly seems to be damaged. Also made some check inside display module but I hope not killed by ESD.The issue is that it stopped provide proper frequency. As this, does not have display it is pretty difficult to guess what failed.In general my observation is that when I set 10MHz it sets 660MHz, if I set 50 MHz it sets 700 MHz.The level change works correctly.My first doubt would be that there is missing signal at some mixer but I'm not specialist in repairing such equipment and do not have even idea where start searching in what module...I would appreciate some suggestions how to start with this repair.

author: piotrekjan
author_rank: Contributor
timestamp: March 02, 2020, 05:32:49 pm
content: Had anyone chance to talk via RS-232 with this generator ? I'm able to send commands, like turn off/on RF but not able to get response...I'm wondering if possible to get diagnostics over RS-232 maybe this would be some starting point ?Regards,

author: piotrekjan
author_rank: Contributor
timestamp: March 03, 2020, 05:48:27 pm
content: By connecting via GPIB I was able to read status.The error I have is 211 - "Summing loop unlocked"I've also tried command :DIAG:MEAS:POINT2? - instrument return 0.5310 in programming manual is 3.52 - however no idea yet where point 2 is.Below the values from :DIAG:MEAS:POINTx? commands:1 - 0.0019042 - 0.53103 - 0.0015634 - 0.0007325 - 0.04586 - 5.00987 - 3.32868 - 8.00009 - 9.000010 - 10.0000Starting from 8 the readout is just number of measurement point - so values from 8 up are not idicative anymore.Only calibration was necessary. After doing it via GPIB it everything came back to normal operation.

author: mcckevin
author_rank: Contributor
timestamp: September 25, 2020, 02:42:12 am
content: Hi Piotrekjan -- I too am getting error 211 - "Summing loop unlocked" after replacing the output fet on my SMIQ03B Signal Generator. This error wasn't present before I fixed the FET. I tried all the calibrations I can find from the front panel yet the error 211 persists. Can I ask you to expand a little on you comment" Only calibration was necessary. After doing it via GPIB it everything came back to normal operation."What commands did you send over the GPIB bus to fix the error 211? Thanks.Kevin

author: piotrekjan
author_rank: Contributor
timestamp: October 25, 2020, 12:20:34 pm
content: Sorry for late answer but I do not visit this forum too often.The GPIB sequence to fix it is following:*RST;*CLS:SYST:PROT1:STAT OFF, 123456:CAL:VSUM?:CAL:ALL?:SYST:ERR?
Smith Corona Messenger Module Repair - Page 1
Forum section: electronics / repair

author: aef0
author_rank: Newbie
timestamp: October 21, 2019, 09:06:12 pm
content: I recently purchased a 'Smith Corona' messenger module. A device which is supposed to interface RS232/Serial or Centronics LPT printer to a Smith Corona typewriter. And allow it to function as a printer. The goal of which is for another project.When I plugged in the device, stupidly, without testing the components first, I was greeted with a nice puff of blue smoke. After opening the case and exposing the board, it appears that an inductor has burnt out.I understand that inductors burning out tend to be caused by another inline component, I've placed an order of all the capacitors on the board, however my question is this:How could I determine what rating the inductor was?It appears to say 10uH, but I believe there may be more to it than that? It looks like the inductor is in series with the large 1000uf capacitor, thus making a LC / tank circuit? Is there a way to work backwards to determine what the component should be?[Left side of photo (bottom) has been flipped horizontally to overlay with the top side of the board]

author: rsaxvc
author_rank: Contributor
timestamp: December 03, 2022, 03:41:10 pm
content: Did the caps help?I also noticed it looks like the circled component may have overheated too.A few different typewriters use something like a 5V Uart from typewriter to box, then the converter box does RS232 or parallel conversion to 5V UART. We have a Smith Corona 250 at my folks place, I may take a peek inside and try to see if there's any indication how this comm link works.

author: wasedadoc
author_rank: Super Contributor
timestamp: December 03, 2022, 07:22:17 pm
content: That coil appears to be in series with a power input from the connector. The coil's output end has that large electrolytic to ground and also goes to one leg of that metal tabbed device. which is probably a linear regulator though I didn't find anything Googling the part number on it. Too much current because the electrolytic has shorted or going into the regulator (or transistor). Shorting to ground regulator or something after that.Coil value is not critical. Just there to reduce noise coming in or going ot.
SML01 Repair Amplifier Replacment  - Page 1
Forum section: electronics / repair

author: mangokid
author_rank: Newbie
timestamp: May 17, 2019, 02:03:32 pm
content: Hello All,I am currently working on my first repair of an RF signal generator. I bough the machine and it seems to have everything wrong with it. The LCD is dead the PLL was unlocked and the output if non existent. I managed to fix the PLL and the LCD can be ignored thanks to a nice RS232 interface on the back of the machine.I am now repairing the output stage. I have traced the signal up to the output Amplifier before the Attenuator. When probed this amplifier is clearly dead. However I cannot for the life of me figure out the part number. I was wondering if anyone had any ideas, or ideas for possible replacements if this part doesn't exist.

author: cvanc
author_rank: Frequent Contributor
timestamp: May 17, 2019, 02:26:20 pm
content: If you tell us the make and model we might be able to help you find service info specific to it. Post a photo of the overall unit so we can see?Good luck with your repair.

author: mangokid
author_rank: Newbie
timestamp: May 17, 2019, 03:00:30 pm
content: It is a Rhode Schwarz SML01 (1090.3000.11). Photos Below.
SMPS repair mosfet replacement - Page 1
Forum section: electronics / repair

author: macross
author_rank: Contributor
timestamp: December 19, 2019, 04:18:04 am
content: A friend of mine gave me three cordless drill lithium battery chargers to take a look at because all of them were faulty. I have managed to fix two of them but the last one has many components damaged because of shorted Mosfet. The MOSFET in question is STP9NK90Z (https://www.st.com/resource/en/datasheet/stp9nk90z.pdf). I can't seem to find this part in any of my local electronics shops. Maybe someone could recommend a drop-in replacement for this MOSFET?Edit: Found this one in my local shop:https://pdf1.alldatasheet.com/datasheet-pdf/view/24533/STMICROELECTRONICS/STP9NB60.htmlwould it work?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 19, 2019, 07:00:11 am
content: Does the supply have active PFC, or do you have 240v mains, or does it use a voltage doubler input?You might be able to get away with a lower voltage transistor for 120V mains and no active PFC or doubler (so the transistor is supplied with, probably 160VDC), but otherwise, I wouldn't suggest it.Tim
SMPS 48v POE power supply - Trying to repair low voltage problem !  - Page 1
Forum section: electronics / repair

author: amin137398
author_rank: Newbie
timestamp: March 08, 2021, 06:39:43 pm
content: hi.I'm trying to repair this 48v poe power supply and I was hoping you could help me figure out the problem.It should have 48v out put voltage but it only has 4 up to 6 volts. I tried replacing a smd capacitor and the optocoupler , these two were bad components but the problem is still there. after looking around more I found that the high voltage side is working just fine and the problem is on low voltage side. specially the feedback circuit. because when I short-circuit the output of the optocoupler for 1-2 seconds I get my 48v back! also on the input of the optocoupler I don't get any voltage. is that normal ?my second suspect is the shunt regulator but I'm not sure and don't have spare parts right on hand to test it.please help me if you know what I should do next .here are the pictures of the board :

author: PKTKS
author_rank: Super Contributor
timestamp: March 09, 2021, 08:20:07 am
content: typical symptom when the internal protection is being tripped ...it looks like some bad component is causing a partial protection trigger..Paul

author: PKTKS
author_rank: Super Contributor
timestamp: March 09, 2021, 08:29:14 am
content: alas... check if some 431 just has gone for a wild walk in the park... typical fault

author: amin137398
author_rank: Newbie
timestamp: March 15, 2021, 12:22:41 pm
content: HiI replaced the regulator yesterday and the voltage is now fluctuating around 3v. Is there anything else to do or I'll have to modify this whole feedback circuit ?

author: PKTKS
author_rank: Super Contributor
timestamp: March 15, 2021, 05:35:58 pm
content: Just replacing usually does not help unless we have a very clear faulty.In these cases there are some very common faults related toaging or failed components..To trace them you need a deep understanding of how the particularSMPS is doing sampling and error correction and MAINLY HOW PROTECTIONSARE IMPLEMENTED.Then.. start probing w/scope these critical points..EXAMPLE:- if a particular supervisor is REQUIRED TO HAVE a 3.3 voltagea PIN NAMED FB/CS - it **MUST** be this value.the datasheet or the board already marks that point voltage.FB is the optocoupler mid point generated voltage and very frequentlyis protected using a BIAS circuit from the auxiliar winding..very common faults the transistor of this BIAS or the zener itself..Another faults are the sampling resistors of the UVP protectionthey are cascaded using GLUE on the board.. aging the GLUEstarts to be conductive ... and SMD fails miserably .. the componentis always good... but the GLUE is causing parasitics..removing the GLUE fixes the UVP protection triggers...and so on... all the culprits are linked to PROTECTIONSassociated with the FB or the CS (current sensing) pins..EACH should be carefully inspected..Paul
SMPS Artesyn NLP250N-99S120N01J used in Tek MDO4054-3 - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: October 04, 2024, 01:54:36 pm
content: HiThis power supply used in Tek Scope .Fuse F3 Resistor type Fuse burnt need to know the fuse rating(Fuse is resistor type in heatsink sleeve)PFA the photos

author: hitecelec
author_rank: Regular Contributor
timestamp: October 05, 2024, 12:26:34 pm
content: The fuse is 1A green color probably Little fuse ( I just gathered the broken remnants and was able to figure out)not sure but slow blow or fast blow though
SMPS contoller i.d. - Page 1
Forum section: electronics / repair

author: Audiorepair
author_rank: Frequent Contributor
timestamp: October 26, 2021, 11:50:54 am
content: Anyone know what this 6 pin SMPS IC is?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 26, 2021, 01:11:20 pm
content: Seems to be Powerforest PF6000A, can't find a datasheet available from here.Tim

author: amyk
author_rank: Super Contributor
timestamp: October 26, 2021, 01:23:49 pm
content: When in doubt, ask the Russians...https://antenna-dvb-t2.info/show_contr.php?id=4http://radio-files.ru/pf6000/The closest thing to a datasheet was 1 page on PF's site and has been attached here for posterity.

author: Audiorepair
author_rank: Frequent Contributor
timestamp: October 26, 2021, 06:08:07 pm
content: Thanks, this is in a pair of cheap "Pioneer" speakers, though I doubt they are actually much to do with Pioneer really.The typical application circuit on the data sheet front page is probably the same from what I remember.

author: fzabkar
author_rank: Super Contributor
timestamp: October 26, 2021, 06:32:50 pm
content: This site claims that OB2263 is a direct replacement:https://monitor.net.ru/forum/threads/609354/https://www.electronica-max.com/pdf/OB2263-406659.pdf

author: Audiorepair
author_rank: Frequent Contributor
timestamp: October 28, 2021, 01:17:44 pm
content: Fixed it eventually, the circuit is pretty much the typical application one.Turned out the VCC capacitor negative goes to ground through a SMD zero link, which was invisibly dry jointed.Pioneer DM-40 powered speakers.
SMPS feedback taking too long to switch back - Page 1
Forum section: electronics / repair

author: nunojpg
author_rank: Contributor
timestamp: May 08, 2023, 11:43:12 pm
content: I'm going a bit crazy repairing a friends fridge boardThe SMPS in this schematic (from a fridge) outputs the right 12 and 16V and then goes off for 300ms and the voltages drop about 50%. The cycle repeats consistently.I've replaced PC817, KA431 and STR-G6352 and measure all components as much as possible.Once the SMPS started to work fine again, just to go bad after a reset.This kind of 300ms cycle points to some RC constant, but all components appear to be fine.I've also tried to re-melt every solder point and check continuity on the traces, and it appears fine.I don't have a differential probe to test effectively the mains side.Some idea?

author: nunojpg
author_rank: Contributor
timestamp: May 09, 2023, 12:15:19 am
content: After finding other posts recomending to check caps with lower capacity I replaced CE2 which was down from 22uF to 19uF and it apparently fixed the problem.I wonder why a 15% drop can cause a failure...

author: MathWizard
author_rank: Super Contributor
timestamp: May 13, 2023, 03:56:23 pm
content: It looks like that cap is for the aux. power rail from the lower winding, that goes to pin4 which should be Vcc of the chip. If you had an ESR meter, I bet something would read worse than it should be. And then maybe a lot of the delay is from the chip, sensing Vcc under-voltage, and timing out for a bit? Or maybe it's upsetting the feedback loop more than the Vcc, but something like that.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: May 13, 2023, 04:06:29 pm
content: The behavior sounds like the regulator isn't receiving enough supply voltage to keep running, so it conks out during startup. Then it waits for R3 to charge it back up, it kicks on, and the cycle repeats. (This is normal "hiccup" mode protection.) Too much ESR means CE2 doesn't retain enough charge during startup, and it fails to stay on.Why does it run eventually? When components heat up, ESR falls, and CE2 operates normally again. It should "reset" on a thermal time constant i.e. it takes some seconds at least, but probably minutes, to return to the failing condition.Tim

author: nunojpg
author_rank: Contributor
timestamp: August 10, 2023, 09:37:36 pm
content: Your answers make all the sense. The fridge stopped working after a power failure. The fault (high ESR) could exist for months or years, but only after the PCB cooled down it was unable to start again.