hybridfree/eevblog-posts huggingface dataset:
Sealant spray for coating\isolating electronics boards and connections - Page 1
Forum section: electronics / repair

author: VEGETA
author_rank: Super Contributor
timestamp: February 16, 2022, 11:34:08 am
content: Hello,I've been looking for a spray to be used on industrial equipment such as control valves positioners, instrument transmitters, switches, etc... to be used in my company's plants (lots of water, moisture, corrosion.)I want it to fully isolate electrical connections, electronics circuits and so on from water, moisture, and preferably from rust\corrosion.Our local suppliers in Jordan gave us one (It's a Kontakt brand) but it failed, doesn't work even in room temperature and normal conditions. after it is applied and left for good amount of time, it still doesn't coat and isolate.I hope you give me trusted and tried brands with part numbers if available.thanks!

author: perdrix
author_rank: Frequent Contributor
timestamp: February 16, 2022, 12:52:57 pm
content: You want to look for "Conformal Coating". Most distributors sell this.David

author: VEGETA
author_rank: Super Contributor
timestamp: February 16, 2022, 02:41:41 pm
content: Quote from: perdrix on February 16, 2022, 12:52:57 pmthanks, I will look for these.however, is this suitable for industrial applications where lots of brine, salty liquids, corrosion, moisture...etc ? and can it be removed after being applied?I appreciate it if you recommend a certain part number which has the highest isolation capabilities. since i saw lots of types like silicon and so on resins

author: jonpaul
author_rank: Super Contributor
timestamp: February 16, 2022, 04:06:22 pm
content: Conformal coatings are high VOC varnish, some are two component like epoxyDesign for such tough environment but impossible to remove or service the PCBUsually found in military and heavy industrial equipment. Upon failure the board is discardzd,and replaced.Jon

author: Bud
author_rank: Super Contributor
timestamp: February 16, 2022, 05:26:52 pm
content: MG Chemicals is a major producer in North America, they have information on different types and part numbers of conformal coating they make:https://www.mgchemicals.com/category/conformal-coatings/

author: abdulbadii
author_rank: Frequent Contributor
timestamp: February 16, 2022, 05:41:09 pm
content: isn't practical cheaper use or DIY a vacuum packing or Vacuum sealers ?the cover sheet is kapton or special plastic ?

author: VEGETA
author_rank: Super Contributor
timestamp: February 16, 2022, 07:42:45 pm
content: Quote from: abdulbadii on February 16, 2022, 05:41:09 pmour stuff are on the plant and get lots of moisture and corrosion materials. we require versatile stuff like spray, for example to spray the board or contacts inside a pressure switch or sway switch.Quoteone technicians mentioned "silicon coating", so I guess it cannot be removed. if wanted to remove it I need to scratch right?I think 422B-340G is suitable but they also have ECC3011 which is "solvent-free" but it doesn't seem to be a spray. I don't know which to choose.
search for electronic components - Page 1
Forum section: electronics / repair

author: lionelkjh
author_rank: Frequent Contributor
timestamp: June 16, 2019, 08:06:53 am
content: Hello everyone! I am looking for 2 voltage regulators smd: XC62FP5002PR, and XC62FP3002PR, because I found the characteristics, but I find no provider owning them. Will there be an equivalent for each model ??

author: bdunham7
author_rank: Super Contributor
timestamp: June 16, 2019, 05:48:29 pm
content: Greentree Electronics has them (gtelec.com).Check Octopart, they show 4 suppliers that allegedly stock them.

author: Zero999
author_rank: Super Contributor
timestamp: June 17, 2019, 03:14:58 pm
content: They don't appear to be anything special.I'm sure you'll be able to find a different part which does the job. Presumably it needs to be in the same package and pin-out?
Search for replacement connector: PCB Mount M12 5 Position... - Page 1
Forum section: electronics / repair

author: FieldEffect
author_rank: Newbie
timestamp: April 14, 2025, 05:11:57 am
content: Hello all,Long time reader of forum content, first time post.I am attempting to find a replacement for a broken connector on an industrial controller.The connector is through hole soldered to a PCB which mates to a cast aluminum cover that contains the threaded feature for the "M12" interface.No manufacturer markings.A colleague found something close but it's too short. I could only find one with a close-ish length from Harting, can probably make it work but finding the original part would be best:https://au.mouser.com/ProductDetail/HARTING/21033211518?qs=T3oQrply3y%252BcYV2jbAZlMw%3D%3DI also noticed the original connector has a very aggressive lead in on the pins which doesn't seem common on any potential replacement in can find.I have checked Harting, TE, Phoenix, Weidmueller, is there another supplier I have missed?Any thoughts, suggestions greatly appreciated!

author: amyk
author_rank: Super Contributor
timestamp: April 14, 2025, 06:06:43 am
content: Any identifying marks/logos on it?

author: FieldEffect
author_rank: Newbie
timestamp: April 14, 2025, 06:39:54 am
content: Only marking I can find on it anywhere is pin numbering
Search manual for HP K02-5060A power supply - Page 1
Forum section: electronics / repair

author: AlcidePiR2
author_rank: Regular Contributor
timestamp: November 05, 2021, 06:32:12 pm
content: Dear All,The HP K02-5060A power supply was used with the HP 5061A Cesium clock to make the first flying experiments with Atomic Cesium clocks in 1964 allowing clock synchronisation over the world.https://www.hpmemoryproject.org/news/flying_clock/celebration_01.htmI am searching for a copy of the documentation and schematics of this power supply. I see there is one original one on ebayhttps://www.ebay.com/itm/402163978288But at 30$ + 50$ shipping to France = 80$, I find the price tag much too large for a few pages.I am sure it is not a very frequent item, but some of you may have it.Schematics alone would be great !Thanks for any help.
firmware for PM6304, PM6306 RCL meter - Philips / Fluke / Wayne Kerr - Page 1
Forum section: electronics / repair

author: yuhar
author_rank: Contributor
timestamp: August 31, 2024, 07:49:46 pm
content: Dear All,Looking for version 1.8 for PM6304, and 1.6 version for PM6306If You can send it, please don't hesitate.Yuhar

author: yuhar
author_rank: Contributor
timestamp: September 08, 2024, 10:26:04 am
content: I hope someone has them.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 08, 2024, 01:12:19 pm
content: be patient and wait, maybe you'll get answers

author: mzspring
author_rank: Contributor
timestamp: April 07, 2025, 02:25:01 am
content: Sorry for not replying to your message. Today, I have time to read the ROM of the machine, and you can also download it from my website.PM6306 V1.3 V1.4 V1.5 V1.6http://www.dt830.com/thread-7946-1-1.htmlPM6304 V1.8http://www.dt830.com/thread-7945-1-1.html
Searching for a specific component with little informations - Page 1
Forum section: electronics / repair

author: theredcat
author_rank: Newbie
timestamp: April 26, 2020, 08:13:48 pm
content: Hi, Looong time EEV follower, but this is my first postI'm searching for a specific component for a Techtronic Industries (parent company for ryobi, AEG, Milwaukee, and others) board that is in my power grinder (BEWS18-125X)It just bursted into flame and I can't identify the specific model since the serial number is more or less calcinedThe only clues that I have are :It's a perfectly squarre TO220 package (no small "dents" on the sides)Probably a power transistor since the board have the label Q6 for that componentThe part number on the first line start with IR and ends with 7The second line starts with a capital "i"There is the letters "FMCW" on the last lineI'm not much convinced that someone will have the answer, but if you do, you'll save me ~35€ for the complete board

author: bob91343
author_rank: Super Contributor
timestamp: April 26, 2020, 10:11:53 pm
content: It's probably an FET. Many of those have part numbers from International Rectifier and start with IRF. I have a few that might work in your circuit but they are cheap and readily available.

author: TheMG
author_rank: Frequent Contributor
timestamp: April 27, 2020, 12:07:21 am
content: More than likely an N-channel MOSFET, probably "logic level" meaning the Vgs threshold voltage is low enough it can be fully switched on from the 3.3 or 5V output of a typical microcontroller (hint: look for the presence or absence of a voltage regulator on the board).Some amount of circuit analysis will be needed to determine if this is in fact the case.Most important characteristics for picking the right part will be:Vgs(th) - must be low enough to allow the driving circuitry to switch the transistor fully on, but not so low as to exceed the maximum gate voltageVds(max) - you probably want to be some margin higher than the maximum fully charged battery voltage, but don't go too crazy on this one, higher is not always better, as MOSFETs with higher voltage ratings tend to have higher on resistance as well as lower current handlingId(max) - this is the tricky one, because you don't know and there is no easy way to determine the peak current that will pass through the MOSFET, so you'll just have to go with the highest rated one (within reason) that also meets the above criteria.
Searching for Hameg HM604-3 Service Manual  - Page 1
Forum section: electronics / repair

author: sprit
author_rank: Regular Contributor
timestamp: February 07, 2023, 03:18:49 pm
content: Hi everybody. Wish everyone have a good day.I have a Hameg model HM604-3. Currently it is faulty in the rear panel. I tried searching the service manual on the internet with no success. Can anyone upload it for me? I have tried contacting R&S support with no success. Thank you so much everyoneSincerely!NSP

author: agent_power
author_rank: Regular Contributor
timestamp: February 09, 2023, 05:21:26 pm
content: You can try to ask Sky Messtechnik, apparently they've taken over for Hameg. At least that's what R&S support told me. They should also have the leftover stock of replacement parts, but never got back to me when I asked for a certain part.When I asked their support they gave me this pagehttps://sky-messtechnik.de/reparaturdienst-service/downloadsIf it's not on there then they don't have a clue eitherGood luck!

author: zerowatts
author_rank: Newbie
timestamp: February 11, 2023, 03:38:56 am
content: Found the manual for your specific model:https://elektrotanya.com/hameg_hm604-3_oscilloscope_um.pdf/download.htmlAnd some schematics:https://www.radiomuseum.org/r/hameg_hm604hm_60.htmlJust click onschematics(on the right side ofpictures)The schematics are however for the 604 model. Do not know if it is for your specific model (604-3). But with a bit of luck the board you are having problems with is the same across these models! Could only find this schematics for the 604.Good luck!

author: AwaisN
author_rank: Newbie
timestamp: April 12, 2023, 03:45:01 pm
content: Hi,Did your oscilloscope problem solve?I am not sure but you can try the following link.https://elektrotanya.com/hameg_hm-604-2_2x2mv,60mhz_delayedtrigger-tv_oscilloscope_1993_full_sm.pdf/download.html#dlRegards,
Searching for HP schematic 03400-66507 HP3400 RMS voltmeter power supply 6 trans - Page 1
Forum section: electronics / repair

author: WB8PFZ
author_rank: Regular Contributor
timestamp: January 12, 2025, 08:06:03 pm
content: Thinking I looked everywhere for a schematic for a HP 3400 ac voltmeter board. Found a few but not the one I have. Mine has six what look like transistors.Thanks Mike HP part number 03400-66507 no revision number

author: HalFoster
author_rank: Frequent Contributor
timestamp: January 13, 2025, 12:49:43 pm
content: Search for "3400A" on Artek's site:https://artekmanuals.com/manuals/hp-manuals/The latest one they have is manual version 03400-90013 which will cover revision 03400-66503 of that board (Video Amplifier Assembly). I haven't seen a revision -66507 of that board - it has stayed the same through the latest models of the 3400A that I have so I would assume that the circuit in the Artek manual should be very close to the same.Hal

author: squadchannel
author_rank: Frequent Contributor
timestamp: January 13, 2025, 01:32:31 pm
content: january 1970 edition manual last page mentioned about -66507.schematic is shown on page 44.also,Quotehttps://pearl-hifi.com/06_Lit_Archive/15_Mfrs_Publications/20_HP_Agilent/01_HP_3400B_20MHZ_True_RMS_Voltmeter/HP_3400A_Op_Serv_1968.pdf

author: WB8PFZ
author_rank: Regular Contributor
timestamp: January 14, 2025, 06:01:47 pm
content: Thanks for all the info. My 75 volt rail has 83 volts. Not sure why or if this will be an issue? Mike
Searching for LED display HL-LED187G-A - Page 1
Forum section: electronics / repair

author: bitwelder
author_rank: Super Contributor
timestamp: July 29, 2020, 11:25:38 am
content: Hello,as per title, I'm looking for this 7-segment LED display, P/N should be HL-LED187G-A.Is in use in a Samsung microwave, and after so many years it seems a bit dim, and if possible I'd like to replace it.Googling around I can't find either the part for sale or its datasheet, only posts on various forums of other people that in the past tried to search for it.Is that a custom part number made for Samsung?The part is a green 7-segment LED, it has classic 4 digits format with the : colon in the middle.I don't think it has any special symbol, and the pinout seems to be a SIL 13 on the display upper edge.
searching for mosfet vnl21 b30h100g - Page 1
Forum section: electronics / repair

author: NCC74656
author_rank: Newbie
timestamp: April 05, 2022, 02:36:14 am
content: i just bought a used crown 2502 amp. they are on back order for at least a year so ebay is where i got it. it was working before shipping. durring shipping it was thrown and the heatsink tore the fets from the board. also damaged SMD components as it bounced around. package was not insured.the fets are nvm21 b30h100g. i cant find this exact fet refrence anywhere. closest i can find ishttps://www.digikey.com/en/products/detail/MBR30H100CTG/MBR30H100CTGOS-ND/1477174?utm_adgroup=Semiconductor%20Modules&utm_source=google&utm_medium=cpc&utm_campaign=Dynamic%20Search_EN_Product&utm_term=&utm_content=Semiconductor%20Modules&gclid=CjwKCAjwrqqSBhBbEiwAlQeqGqGXd8y9ls9NdNZGQev0AH_dwvSRcax90VwY7qKHWQfr57zHwdKNuxoCKvEQAvD_BwEbut i dont know if this is right. attached are photos of the fet and its reading. can someone check this. thanks.given its shipping damage, im assuming after repair it should work.

author: picburner
author_rank: Frequent Contributor
timestamp: April 05, 2022, 04:02:54 am
content: The silkscreen printing on the pcb of the component in the photo says D108, in fact it is not a mosfet but adouble diode 30A 100V.

author: NCC74656
author_rank: Newbie
timestamp: April 06, 2022, 04:41:23 am
content: thank you for verifying. ill order up enough to replace both channels as ill be bridging them. amps are SO HARD to come by these days, decided to try my hand at fixing this one rather than returning the ebay sale.

author: abdulbadii
author_rank: Frequent Contributor
timestamp: April 09, 2022, 02:23:32 pm
content: https://datasheetspdf.com/pdf/913891/ONSemiconductor/B30H100G/1as seen on its schme, a parallel diode outpit in the mid pin and the top metal
Searching for Motorola 16045580 datasheet - Page 1
Forum section: electronics / repair

author: dr.diesel
author_rank: Super Contributor
timestamp: May 04, 2020, 09:37:36 pm
content: It's a TO-220-5, not having any Google luck myself.This is a repair of a GM 1227165 Engine computer.Thanks

author: amyk
author_rank: Super Contributor
timestamp: May 05, 2020, 03:56:26 am
content: That looks like a custom part number, which will be next to impossible to find. However, Motorola doesn't make that many ICs in that package, so how is it connected? That might be enough to narrow down its purpose.

author: dr.diesel
author_rank: Super Contributor
timestamp: May 05, 2020, 05:28:03 pm
content: Looks to be a P-Channel MOSFET, though I can't find any gate activity in testing, this board may have other issues.1 = Battery VCC, Cap to GND2 = Output, CAP to GND (VCC to fuel pump relay, i think)3 = ?4 = GND5 = ?Tab is isolated from GND, no external flyback.I need to dig further, got cut short with rain.

author: dr.diesel
author_rank: Super Contributor
timestamp: May 05, 2020, 06:24:51 pm
content: My Google Fu is better today:
Searching for name of this connector - Page 1
Forum section: electronics / repair

author: hscade
author_rank: Contributor
timestamp: May 05, 2019, 09:17:59 pm
content: Hi,anyone knows the exact name of this connector and maybe also for the name for the socket?It from an Anycubic I3 Mega 3d printer.Kind Regards,rampDD

author: JimG
author_rank: Newbie
timestamp: May 05, 2019, 10:37:18 pm
content: could be AMP, TE, MOLEX. is there any identifying marks on the plug? you could measure out the pins and order a header and plug of your own from mouser or digikey.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: May 06, 2019, 01:47:33 am
content: ...but more likely, PHOENIXhttps://www.digikey.com/products/en/connectors-interconnects/terminal-blocks-headers-plugs-and-sockets/370?FV=ffec5399
Searching for schematics of  MCP  M10-QD305  power supply.  - Page 1
Forum section: electronics / repair

author: JacquesBBB
author_rank: Frequent Contributor
timestamp: January 29, 2023, 04:34:12 pm
content: Dear All,I know it is not obvious to find, but one of you may have a schematics for a MCP M10-QD305 laboratory power supply.https://www.mcpsh.com/pd.jsp?id=56It could be a close one also, but the part that interest me the most is the output switching with the 4013 logic chip.Thanks

author: bidrohini
author_rank: Regular Contributor
timestamp: January 30, 2023, 01:19:47 am
content: I was looking at the manufacturer's websitehttps://multi-com.eu/,details,id_pr,16979,key,laboratory-power-supply-mcp-m10-qd305-2x30v-5a.htmlThey have provided all info here but there is no schematic. I don't think it is open source. You can send them an email asking for it.
Searching tech info about Midtronics Car Battery Management - Page 1
Forum section: electronics / repair

author: Carbedd
author_rank: Newbie
timestamp: January 15, 2025, 01:20:18 pm
content: I'm searching any tech docs about this device made in USA, Midtronics (GR1-240) advanced automotive battery management.Similar device as GR1-120 may be apreciatedThanks to all
Seasonic FOCUS SPX 750w blows fuse when started. 5Vsb works. No shorts found - Page 1
Forum section: electronics / repair

author: acedogblast
author_rank: Contributor
timestamp: September 18, 2024, 12:12:54 am
content: Hello everyone. I have a Seasonic FOCUS SPX 750w SFX (smaller ATX) PC power supply that blows its main fuse (12A) on startup (Green PS_ON signal is sent). After replacing fuse and one shorted diode (PFC bypass rated at 3A) I plugged in to find that 5V stand by is working fine but right when PS_ON signal from motherboard/PSU tester is sent a spark was seen and the fuse blows again. Replacing the fuse again and using a current limiting dim bulb tester, 5Vsb works but when starting up the dim bulb tester is rapidly flashing on and off. PSU tester does not turn on.Probing around the PSU again on all main components gives me no shorts. Checked PFC mosfet and diode, 2 main switching mosfets, and large bulk filter cap shows no shorts. I can't even find any burn marks from the spark. I suspect that the 2 main switching mosfets in a half-bridge configuration is somehow driven to be activated at the same time (this should never happen normally). No short between the gates of these 2 mosfets though. So now I suspect either faulty controller or gate driver ICs.Do you all have any other possibilities that I should check?See tear-down and component pictures here:https://www.techpowerup.com/review/seasonic-focus-spx-750/3.html

author: acedogblast
author_rank: Contributor
timestamp: September 18, 2024, 11:23:14 pm
content: Found where the spark was coming from. Used a larger 200w bulb instead of a 40w. This was enough to repeatedly make a spark from the main PFC diode to the heatsink it was attached too. Almost certain the insulation between them is compromised. I did not find this before with multimeter so it must be the thermal expansion of the diode.

author: MathWizard
author_rank: Super Contributor
timestamp: September 24, 2024, 06:58:25 pm
content: Yeah that's something I'd probably forget about, or not consider till the end. This winter I was working on an old stereo, and when trying to fit smaller power transistors, with mica insulators and plastic collars, I was still shorting the screws to the HS. Actually there was no drilled out section for the collar, so I had to drill the holes. Then it all fit secure.
Second opinion on my diagnosis - Hayward GLX-PL-LOC-P-4 Pool Controller - Page 1
Forum section: electronics / repair

author: Daveedius
author_rank: Contributor
timestamp: March 07, 2023, 04:18:10 am
content: I'm repairing a Hayward GLX-PL-LOC-P-4 due to the LCD not displaying any characters; the backlight comes on and other control buttons appear to be working. Info about the board:- PIC16F913 uC- NHD-C0220AA-FSW LCD (obsolete, no pin-compatible replacement)- LCD receives 3.3V directly from one of the uC's GPIO pins.Upon intial inspection, I discovered that the bypass cap for the LCD was badly corroded & gave no sensible reading from my LCR meter. Replacing the cap with a 1uF one made no change.From there, I switched to my scope, and verified that the uC is indeed sending data to the LCD. After digging a little deeper, and checking the power rails, I discovered that the microcontroller is resetting the power to the display every 4 seconds.Now from this information, I'm presuming that the LCD is dead. When it doesn't respond to the uC within 4 seconds, the uC power cycles the display in a desparate attempt to get it to work properly again. What are your thoughts on this theory?

author: Swake
author_rank: Frequent Contributor
timestamp: March 09, 2023, 08:02:55 pm
content: Sounds like you're right but of course it is difficult to say for sure. Two other hypothesises: Did the µC pin that powers the display fail, or did the power supply kinda failed and can't handle that additional current anymore? I guess you would have noticed that last one as you measured the power supply already.Datasheet to your display:https://www.digikey.com/en/products/detail/newhaven-display-intl/NHD-C0220AA-FSW-FTW/2626392It is a 3.3V and 2x20 character display. On their website NewHeavenDisplay offers these displays:https://newhavendisplay.com/lcd-displays/character-displays/?Size=2__Rows__|__20__Characters&filterPage=1It seems the NHD-C0220BA-FSW-FTW-3V3 might be the right one to replace your current display. You'll have to verify all specs. 12 bucks is not the end of the world if it turns out the issue is not the display.Seems the Novatek NT7605 controller on that display is only slightly different from the pseudo standard HD44780 protocol too.

author: Daveedius
author_rank: Contributor
timestamp: March 15, 2023, 10:48:06 pm
content: Turns out it was indeed the display. Couldn’t find them anywhere so I had to find a repair service that had some donor boards. Unsure if the new display you listed would work but I agree, it would be worth checking out if I have to repair anymore of these boards.
Secondary side controller SMPS don't turn on by itself. - Page 1
Forum section: electronics / repair

author: Huram Arvit
author_rank: Newbie
timestamp: April 21, 2024, 10:30:45 pm
content: I'm having trouble with a SMPS. When I use a bench power supply only to start it's controller circuit, it works fine adjusting the PWM and keeping output voltage at 12v, however it doesn't start by itself. I've already checked and replaced the pulse capacitor at the primary, but the problem persists. The circuit uses a 494 as PWM generator.

author: tbegal
author_rank: Newbie
timestamp: April 22, 2024, 09:51:06 am
content: How is the Modulation controlled? POT or Digital?

author: Huram Arvit
author_rank: Newbie
timestamp: April 23, 2024, 01:45:17 pm
content: It uses a voltage divider and the 5v ref and the error amp from the IC to adjust it.

author: wraper
author_rank: Unknown
timestamp: April 23, 2024, 01:54:39 pm
content: Check components around power transistor bases, especially small electrolytic capacitors.
Seek Compact XR Thermal Camera not working after Lightning Connector Broken Off - Page 1
Forum section: electronics / repair

author: fadetonoir
author_rank: Newbie
timestamp: March 10, 2022, 02:48:57 am
content: I have a broken Seek Compact XR thermal camera for iOS where the lightning connector has broken off.I thought repairing it should be a simple case of resoldering the lightning connector, but as I don't currently have a device with a lightning connector I was wondering if a conversion to USB-C or micro USB would be possible.After much research - mostly on this forum, which seems to be a goldmine for these cameras so thanks to everyone who's ever posted information about them here! - I determined that not only is a conversion perfectly possible because they use the same mainboards (and almost the same ribbon cables - just the iOS version has the extra IC for communicating with Apple devices) but I wouldn't even need to replace the lightning connector, I could solder a USB cable straight to the mainboard.So I thought before I did anything else I would just check to see if the camera was working - I chopped a regular old USB-A to USB micro cable in half and soldered the micro USB end to the board, but it wasn't detected by the app when I plugged it into a phone. Then I tried soldering the USB-A end of the cable onto the board and trying it in a PC - not detected, nothing in Device Manager. In both cases I tested my connections with a multimeter and checked that nothing was shorted and also checked for voltage but there was none present.I had better luck with USB-C - soldering wires to a spare breakout board and adding a 5.1k resistor between CC and GND, as per this guide -https://www.dcddcc.com/blog/2018-11-10-retrofitting-the-seek-thermal-compact-with-a-usb-type-c-connector-using-3d-printing.htmlWith that setup, the camera does actually receive power from the phone (or PC if connected via a USB C to A adapter) but it does nothing except get warm, with one chip in particular getting very hot very quickly.I've highlighted the chip in the attached photo - I believe it's a switching regulator, as described by mikeselectricstuff in his excellent teardown video on YouTube. Mine is labelled CEY 7AJ P7LR but I can't find any information on it. If it's getting really hot is it safe to assume it's shorting and therefore needs replacing? Or could the fault lie elsewhere?Any help or suggestions much appreciated!
seek help RIGOL ds6104 flash chip data - Page 1
Forum section: electronics / repair

author: gao415517
author_rank: Newbie
timestamp: September 25, 2021, 04:09:36 pm
content: seek help RIGOL ds6104 flash chip dataMy RIGOL ds6104 flash chip data is lostAsk someone who can share the firmware read out by the editor or 32 megabyte memory dump fileEmail: gao40555315@163.com.
seek help:AFG3000 - Page 1
Forum section: electronics / repair

author: lern01
author_rank: Regular Contributor
timestamp: November 21, 2023, 07:59:19 pm
content: My AFG3101 CPU motherboard on a patch resistance burned, do not know how much resistance value, it should be a small resistance value of high-power resistance. Please let me know if anyone knows. In addition, The machine reported errors during diagnosis and self-calibration, and the error codes were 2303 and 1103 respectively.. Hope to get your help, thank you very much!
Seek specific resistance values from HP 3458A RP7 - Page 1
Forum section: electronics / repair

author: gejianyong
author_rank: Contributor
timestamp: April 12, 2024, 12:23:25 am
content: Repairing a 3458A RP7 that broke down. The circuit diagram is not very clear. Who knows if this is 9.5M or 9.9MAsking who has this part for sale

author: Kosmic
author_rank: Super Contributor
timestamp: April 12, 2024, 12:30:56 am
content: Quote from: gejianyong on April 12, 2024, 12:23:25 amlook like 9.9M to me. Also 9.9M would make a lot of sense since adding 100k you would have 10M on the input.

author: gejianyong
author_rank: Contributor
timestamp: April 12, 2024, 12:37:44 am
content: Thank you. I think so too, but the drawings also look a bit like 9.5

author: donlisms
author_rank: Frequent Contributor
timestamp: April 12, 2024, 04:56:09 pm
content: Yup. The pixels in the middle of the right side are curved the wrong way for a 5; they form an upward point, not a downward curve. Compare it to the 5 immediately to the left.
Seek Thermal camera compact xr and pro - Page 1
Forum section: electronics / repair

author: Steves Workshop
author_rank: Newbie
timestamp: August 25, 2022, 01:09:22 pm
content: Hi everybody , i am new to this channel and i normally repair computers and laptops so i know basics in electronics and have some test equipment in the last 20 months ive bought 3 seek thermal cameras i have 2 compact xr one ios and one android and i also have a compact pro android and in this time all the 3 units have died .All 3 cameras are dead and not recognised by my phones so i have tested them in friends phones and ipads and nothing. I have talked to a few people and they have said i should of bought Flir but at the time i had them for good prices and they worked well for the time i.I bought the 2 compact xr the same time one for my phone and one for my dads phone and within a month of each other they both died so i bought the compact pro and 11 months later this has died .I would appreciate any kind of help I've checked the ribbon cables on all 3 units and they have continuity as i was told the ribbons break easily on these cameras all the camera lens cover operate with magnetism i.e. a piece of metal waved by the coil.Please help as i cant afford to buy another i need to get one working ive emailed seek with no answer .Regards Steve

author: Whitefoot
author_rank: Contributor
timestamp: October 30, 2022, 07:22:02 pm
content: I use my Seek Compact Pro with an Android LG pad. It rarely connects on the 1st try. I leave the app open and unplug and replug the camera, repeatedly. Sometimes it takes numerous tries before it connects. I find it connects more quickly when the pad battery is charged to 100%. My software version is 2.1.7.1.
Seek Thermal Compact Pro USB Pin Out? - Page 1
Forum section: electronics / repair

author: w0nk1
author_rank: Contributor
timestamp: February 24, 2023, 02:56:33 pm
content: Hi guys,My Seek Thermal Compact Pro (Micro USB) went bad and I was tinkering around and tried to wire an external Micro USB male connector. Unfortunately, the ribbon cable was torn and I am not sure if I remapped the pins on the board correctly. I have attached a picture from the PCP of the camera with the ribbon cable connector removed. I have labeled the pins which I assume are the correct mappings. Does anyone know the pinout and can help me with the wiring?Thanks so much! It would be a shame if the camera did not work just because of the wrong connections.CheersMarkus
Seeking guidance: replacing a failed tantalum SMD capacitor - Page 1
Forum section: electronics / repair

author: nidlaX
author_rank: Frequent Contributor
timestamp: September 03, 2024, 01:00:02 am
content: Hi all, I've found a failed (short) tantalum SMD cap as pictured that sits on a 14V power rail. I've been on Digikey and located tantalums of similar capacity / voltage / footprint, but I was wondering if you would have any guidance on how to select a suitable replacement. I'm not very familiar with the nuances, and I don't know about the ratings (reliability, ESR, etc.) of the original part since I can't identify the manufacturer and series.Should I just grab any 100uF 16V tantalum that fits, or is there more to consider? Thanks!

author: mengfei
author_rank: Regular Contributor
timestamp: September 03, 2024, 01:45:18 am
content: here are some reference you can check out but if it where me i would go beyond the 16V limit of the caphttps://algotrader.app/x7r-capacitor

author: Kim Christensen
author_rank: Super Contributor
timestamp: September 03, 2024, 02:22:27 am
content: Quote from: nidlaX on September 03, 2024, 01:00:02 amPretty much. Though if I was ordering them I'd be getting more than one. Therefore, I would search for ones with a higher voltage rating that fit the footprint and buy those if they exist.

author: David Hess
author_rank: Super Contributor
timestamp: September 03, 2024, 02:32:53 am
content: Quote from: Kim Christensen on September 03, 2024, 02:22:27 am14 volts on a 16 volt solid tantalum capacitor is not much of a derating, which likely explains the failure. So I agree that a higher voltage part should be used. I might also replace any other 16 volt tantalum capacitors which are also on that 14 volt rail.Failures with 2/3 voltage derating are very unlikely. With 1/2 voltage derating it becomes practically impossible.

author: nidlaX
author_rank: Frequent Contributor
timestamp: September 03, 2024, 03:52:49 am
content: I appreciate all the input, and it all makes sense. Thank you!
Seeking help from a Tektronix spectrum analyzer, part ROS-4720-1 voltage control - Page 1
Forum section: electronics / repair

author: gejianyong
author_rank: Contributor
timestamp: May 03, 2024, 09:52:47 am
content: Seeking help from a Tektronix spectrum analyzer, part ROS-4720-1 voltage controlled oscillator VCO, malfunctioned when the temperature was slightly higher. measure the input+ to ground voltage drop rapidly as the temperature increased. Suspected it to be a damaged SMT transistor labeled 86, unknown specific replacement model. Seeking help

author: Testtech
author_rank: Regular Contributor
timestamp: May 04, 2024, 09:54:24 pm
content: That is a mini-circuits lab part. Search for the MCL- part number.
Seeking replacement rubber compresion seals for cable gland - Page 1
Forum section: electronics / repair

author: Lomax
author_rank: Frequent Contributor
timestamp: August 20, 2023, 09:11:50 am
content: Ok, I give up. What are these things called?I've spend a good while searching, Mouser, Digikey and eBay, but cannot find replacement seals for these cable glands - surely this is a thing? After all they are perishable, as evidenced by the photo, while the rest of the gland remains perfectly usable...

author: jpanhalt
author_rank: Super Contributor
timestamp: August 20, 2023, 09:45:08 am
content: When faced with situations like that, I resort to a local hardware store, auto parts suppliers, and/or small engine shops. Faucet washers, other rubber washers and rubber/silicone tubing (e.g, fuel line, vent lines, etc.) will often substitute. Even stacked O-rings might help. If you need to cut rubber, use a sharp blade and lubricate it with soapy water. PVC tubing cutters als work well with larger tubing.If price is not an issue, McMaster Carr has a lot of rubber parts.John

author: Swake
author_rank: Frequent Contributor
timestamp: August 20, 2023, 08:36:13 pm
content: Cable glands are still sold and in use. Exist in different metals and plastic. Any DIY shop should have some. Recover the rubber joint from a new one and put it in yours. That little metal washer is key to being able to turn the washer as it kinda slips.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: August 20, 2023, 10:36:56 pm
content: This is one of those things that is never intended to be repaired, just replaced. So just like ball bearings when the shield or ball retainer fails you just replace the whole thing. If you are doing a museum quality restoration and want to retain the exact original appearance your best bets will be to do as Swake says and recover something usable from a similar new gland seal, or fabricate your own replacements from rubber or neoprene. A laser cutter should make neat work of the job, perhaps you have a mate who owns one, or can talk a nearby advertising shop to do it.

author: coppercone2
author_rank: Super Contributor
timestamp: August 21, 2023, 08:36:31 am
content: you can maybe cast it from silicone rubber epoxy

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: August 21, 2023, 09:02:12 am
content: Hi Lomax,have you tried to search for "M20" or "PG13.5" and "Pflitsch" on digikey/mouser?Tons of glands and sealing-rings.Good luck
SEF 551.10 - Error starting the reflow oven. - Page 1
Forum section: electronics / repair

author: bpjl
author_rank: Contributor
timestamp: October 17, 2024, 12:33:51 pm
content: ​Hello,When starting the SEF 551.10 reflow oven, the following problem occurs:It seems to me that this is related to corrupted software. Does anyone have files that can fix this device? Or maybe someone uses such an oven and is able to make a sector copy of the memory card located in the computer controlling this oven?PS.: Of course, appropriate emails for help have been sent to the manufacturer and distributor in my country. No response yet, but I don't expect much. It's a fairly old device and from what I know, it's no longer supported.I inserted the mentioned SD card into the reader. It turned out that there was one FAT32 partition there - completely empty. So now I'm wondering if:The SD is empty because something happened, and by default there should be some content there. Is that why the computer cannot download the configuration?The SD is empty and has always been so, and the damaged data (configuration files or something) are located in some other memory on the computer PCB itself?Have I mistakenly assumed it's a software problem and I am heading towards a dead end?

author: bpjl
author_rank: Contributor
timestamp: October 23, 2024, 02:06:35 pm
content: After contacting SEF, their technical department rose to the challenge. They found the update file in the archive and sent it by e-mail along with the appropriate instructions. This allowed the oven to start.
Anyone know what component this is? - Page 1
Forum section: electronics / repair

author: Chris Roubis
author_rank: Contributor
timestamp: July 15, 2020, 12:31:11 pm
content: Hi GuysI have a question about a component on this 1970's seiko digital watch seiko quartz AO31-5000 circuit.I am wondering if anyone is familiar with the white ceramic component next to the crystal on the right of the screen.Is it a capacitor?There is no continuity when I test it. It's like i'm testing a rubber tireMuch appreciated.

author: Labrat101
author_rank: Unknown
timestamp: July 15, 2020, 12:56:07 pm
content: It a capacitor probably 8 or 10 pf (may also be a custom value pf depending on the rest of the circuit)BTW don't use WD40 or any other cleaner on this or you will kill it

author: Chris Roubis
author_rank: Contributor
timestamp: July 15, 2020, 01:07:49 pm
content: Thanks mate
self centering thumb switch - Page 1
Forum section: electronics / repair

author: dustooff
author_rank: Contributor
timestamp: October 08, 2021, 01:48:27 am
content: Hello World,looking for possible replacement part for this thumb switch, 4 wires out of body, connecting to loom plug with label that has 'ITT PN : 300008 MEX' and a serial number.Normally meant to be activated by thumb and should self centre, but generally is a type of rocker switch.So far I have not been able to find any product from ITT matching this device. Coming up null on other vendors.Has anybody seen these before?

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: October 08, 2021, 02:23:17 am
content: Maybe try Marquardthttps://www.voelkner.de/products/809910/Marquardt-Wippschalter-01939.3314-01-250-V-AC-14A-2-x-Ein-Aus-Ein-IP65-Front-tastend-0-tastend-1St..html?ref=43&utm_source=google&utm_medium=organic&utm_campaign=fpla&gclid=EAIaIQobChMIk5HBguC58wIVGojVCh3McQNyEAQYBCABEgLeQfD_BwEor Schurter
Self test FAILED Anritsu MT8222A - Page 1
Forum section: electronics / repair

author: bav
author_rank: Newbie
timestamp: November 16, 2024, 08:15:14 am
content: Hello!I see the message SELF TEST FAILED during boot up the device. But device powers on and shows something.Does this failure of test mean device is broken somehow? Is it critical problem?Thanks!

author: bav
author_rank: Newbie
timestamp: November 18, 2024, 08:01:06 am
content: Any ideas are highly appreciated

author: metrologist
author_rank: Super Contributor
timestamp: December 04, 2024, 04:01:29 am
content: Go into system menu and run the self test. It will report test results and what failed. The system self test is just that. The application self tests apply to currently set measurement application (CAA, SPA, etc.)Boot-up Self Test fails:1. Perform a Master Reset.If the message relates to the RTC battery, replace the RTC battery on the Main PCB.2. The Main PCB has failed. Replace the Main PCB/Spectrum Analyzer assemblyPerform a Master Reset:1. Turn the instrument on.2. Press the Shift button then the System ( 8 ) button.3. Press the System Options submenu key.4. Press the Reset key, then the Master Reset key.5. A dialog box will be displayed on the screen warning that all settings will be returned tofactory default values and all user files will be deleted. This deletion is a standard filedelete and does not involve overwriting exiting information.6. Press the Enter button to complete the master reset.7. The instrument will reboot and the reset is complete.

author: bav
author_rank: Newbie
timestamp: December 26, 2024, 03:58:15 pm
content: Thanks for reply!Just got some details from Self test logo.Is it really battery should be replaced?

author: metrologist
author_rank: Super Contributor
timestamp: December 29, 2024, 05:46:28 pm
content: That's what it looks like - the small coin cell battery on main PCB.

author: bav
author_rank: Newbie
timestamp: December 29, 2024, 08:19:41 pm
content: Yes, you were right. This small battery caused the issue. I replaced it and self test passed OK! Thank you so much!BTW, is there any way to open options on MT8222A?PS: to whom it may concerned battery type is BR1225

author: metrologist
author_rank: Super Contributor
timestamp: January 07, 2025, 01:22:48 am
content: Options can be unlocked/installed with internal Anritsu SW. Some savvy hacks might be able to play with the hex code.Some of the worthy options require hardware. If I were thinking of the high accuracy power meter, I'd rather find something else since only the older power sensors would be supported. None of the demodulation analyzers are interesting unless you're doing compliance testing of those standards. Interference Analyzer and Channel Scanner might be interesting, but they are older implementations. Gated Sweep is another SW option.
Semicon S-219 rectifier diode cross-reference. - Page 1
Forum section: electronics / repair

author: nonsuchpro
author_rank: Contributor
timestamp: May 11, 2020, 10:06:52 pm
content: Hey all!I need to replace a rectifier diode but coming up short on a data sheet or cross-reference. It's a Semicon S-219 (pics below). A buddy of mine said a 1N4007 should work just fine. I believe him but I figured I would ask you guys what you think I should use.Thanks in advance!

author: Evangelopoulos Panagiotis
author_rank: Contributor
timestamp: May 14, 2020, 08:11:28 am
content: I have no idea if this is even close to what that diode is but it was all could find.https://datasheetspdf.com/datasheet/1N219.html

author: David Hess
author_rank: Super Contributor
timestamp: May 14, 2020, 02:11:30 pm
content: The only real question is about the current; offhand I do not remember over what current range the "top hat" package was used. But the chances are that the 1N4007 which is 1 amp will work fine.Quote from: Evangelopoulos Panagiotis on May 14, 2020, 08:11:28 amI do not think that is correct because it is the wrong package.
Sencore fe160 half dead? - Page 1
Forum section: electronics / repair

author: wd5jfr
author_rank: Regular Contributor
timestamp: December 01, 2022, 10:43:42 pm
content: Just got one that that lacks meter indication. I've seen all the previous posts elsewhere on the FE160, but no help. The manual (https://bama.edebris.com/download/sencore/fe160/fe160.pdf) description of its operation doesn't make sense in many places and what I found is that is a careless and poorly edited rewrite of the FE20 operation. Some parts are not listed. The power supply voltages are correct after I figured out that chassis is not ground. Having said that I inspected and poked the solder joints wiggled and tugged wires and again no indications. I was going to spray the switches but decided against that since they are pretty well sealed and Sencore says they test for a million operations. By the looks of the unit it hasn't has much use as there's very little evidence of wear and tear and is very clean.. It may have been a shelf queen from early failure. I exercised all the pushbuttons many, many times and found that it responds only to AC voltage but about 15% to 20% low. Tell me if I'm wrong but I think this is an indication that the balance bridge is functional to some degree. When I touch the TR1 input green wire the meter responds while I have my finger tip on a 9 volt battery which I assume is another indication that the bridge is working. This leads me to believe that there might be a single point of failure in the switch arrays or a common joint or wire lead that affects ohms, DC volts & current. The ZERO adjust knob is functional but OHMS ADJ is not. Any suggestions on what the failure or failures might be (other than me & my 82yrs age) appreciated.Hank

author: Whitefoot
author_rank: Contributor
timestamp: February 04, 2024, 08:31:19 pm
content: I just noticed this. Last time I used my FE160, cleaning the switches was necessary to get it working. I like a cleaner with silicone added to lubricate after cleaning, like MG Chemicals contact cleaner with silicones.The meter movement on mine is over-damped - whenever I use it, I tap the side of the case and the needle slowly reaches the full reading. I think this may be common due to the large meter size.Contact cleaner will probably be useful on the OHMS pot.