hybridfree/eevblog-posts huggingface dataset:
Anyone Identify This Connector? - Page 1
Forum section: electronics / repair

author: The Doktor
author_rank: Regular Contributor
timestamp: March 29, 2024, 11:15:14 pm
content: Can anyone tell me what this connector is? And if it is no longer available, is there a good substitute? A friend was reinstalling this board after I repaired it, and snapped the connector. I have a feeling CA glue would probably not be sufficiently strong.It is an 11 pin connector, .100( or very close) pitch for one of those flexible flat plastic cables. I believe it is the connector for a small keyboard.The board has a 1979 production date on it. The connector is marked Molex on one end and 4850 on the other. I thought it would be very obvious to find, but I have not found any pictures or references to a connector like this. Even if it is completely obsolete, I would expect at least a few pictures. Somebody please tell me what I'm missing?ThanksEd

author: amyk
author_rank: Super Contributor
timestamp: March 29, 2024, 11:34:26 pm
content: Unfortunately the state of search engines these days means only the newest and most popular things can be found easily.If it says Molex, you could try asking them.Nonetheless a 0.1" pitch 11-position FFC connector is not exactly a rare part.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: March 30, 2024, 01:32:59 am
content: No other identifying marks on it? What fits into it?Tim

author: tooki
author_rank: Super Contributor
timestamp: March 30, 2024, 12:50:38 pm
content: Here’s the drawing, most likely:https://tools.molex.com/pdm_docs/sd/015254241_sd.pdfIf it’s the right series, then you’re after part number A-4850-11, aka 15-25-4111, which is discontinued:https://www.molex.com/en-us/products/part-detail/15254111https://www.digikey.ch/en/products/detail/molex/0015254111/52198https://www.mouser.com/ProductDetail/Molex/15-25-4111
Anyone in Chicago got an old EPROM reader?  I need to copy a 2716 - Page 1
Forum section: electronics / repair

author: cvanc
author_rank: Frequent Contributor
timestamp: August 28, 2019, 08:01:30 pm
content: I long ago got rid of my PROM burning stuff, but suddenly find myself needing the BIN out of a vintage 2716. Is there anyone in or around Chicago that can assist me as a one-off? Send me a message if you can, and many thanks.

author: bsudbrink
author_rank: Frequent Contributor
timestamp: August 28, 2019, 08:22:30 pm
content: You can get a bare board Willem on ebay for practically nothing. They're very easy to use. It would probably end up being faster (and maybe cheaper depending on how you value your time) than hooking up with someone local.

author: CJay
author_rank: Super Contributor
timestamp: August 28, 2019, 08:48:57 pm
content: If nobody bites and you have one there are sketches out there for Arduino

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: August 29, 2019, 03:29:32 pm
content: Have both TL866 CS and Plus as well as Willem, pick and choose.. I've send you a pm.
Anyone in UK, Somerset, Wiltshire, Dorset with hotair soldering kit? - Page 1
Forum section: electronics / repair

author: mendip_discovery
author_rank: Super Contributor
timestamp: August 07, 2024, 05:13:19 pm
content: I have two boards needing some parts soldered on and I don't quite need a hotair station (yet!).Is there anyone in the area who will let me use their kit for a few hours, I can offer cider or the use of a Transmille calibrator for a few hours.

author: coppice
author_rank: Super Contributor
timestamp: August 07, 2024, 05:19:06 pm
content: Hot air products are easy to find. Its the real working ones you need to hunt for...... sorry, I couldn't resist a hot air gag.

author: mendip_discovery
author_rank: Super Contributor
timestamp: August 07, 2024, 05:21:06 pm
content: Quote from: coppice on August 07, 2024, 05:19:06 pmIf I need hot air I know where to go ;-)Its just SMD parts, I could use my gas soldering iron in blow torch mode but I just think that will make a mess.

author: perdrix
author_rank: Frequent Contributor
timestamp: August 08, 2024, 05:06:51 am
content: I have hot air kit, but I live near Stratford-upon-Avon ...D.

author: mendip_discovery
author_rank: Super Contributor
timestamp: August 09, 2024, 04:05:49 pm
content: Well I managed to get the loan of a hot air unit, it was a hard bargain.The loaner got an adjusted 2000 Keith and I also managed to measure their 10V ref on my work 3458.Just need to use the heat gun to do do my soldering now.
Anyone out there with a Clarke-Hess 828 calibrator that can measure ripple? - Page 1
Forum section: electronics / repair

author: Jester
author_rank: Frequent Contributor
timestamp: April 23, 2020, 12:57:15 am
content: I picked up a non-working Clarke-Hess model 828 calibrator and now have it working for the most part.The only remaining issue (that I'm aware of) is excessive ripple in dc mode, the specification is actually pretty loose for this "<1%rms at full scale".So if you have a functioning 828, the following two measurements would be quite helpful. Scope capture of ac ripple, so ac coupled, 20MHz limit, simple single ended measurement as well as differential.1) DC mode voltage set to 0.999 in 10V mode, so 9.99V2) DC mode voltage set to 1.999 in 10V mode, so 19.99V
Anyone recognise this chip logo/series - Page 1
Forum section: electronics / repair

author: Lorenzo_1
author_rank: Regular Contributor
timestamp: June 27, 2021, 11:50:01 am
content: Looking at a Li battery controller that gives a regulated DC power output. It has several chips that I've not been able to identify. Not able to photograph effectively but all have BA7xxx code and logo "AP"(?) perhaps as shown in attached image. The BA7K11 and BA7K11 look to be SOT223-8 packages (~5 x 4mm across the encapsulation). The BA7P12 appears to be a MOSFET. Does anyone recognise this manufacturer and or chip series?

author: magic
author_rank: Super Contributor
timestamp: June 27, 2021, 12:03:44 pm
content: http://aosmd.com/

author: fzabkar
author_rank: Super Contributor
timestamp: June 27, 2021, 08:19:16 pm
content: When I search for BA7P I get ...http://www.aosmd.com/pdfs/datasheet/AO4402.pdfWhen I search for BA7K I get ...http://www.aosmd.com/pdfs/datasheet/AO4419.pdfHowever, there is no reference to BA7P or BA7K in either datasheet???

author: amyk
author_rank: Super Contributor
timestamp: June 27, 2021, 08:37:00 pm
content: That's because it's the lot/date code.The first line should contain 4402 or 4419.https://assets.lcsc.com/images/lcsc/224x224/20180914_Alpha-Omega-Semicon-AO4402_C115828_front_10.jpghttps://commons.wikimedia.org/wiki/File:Terra_Pad_1050_-_AO4419_on_mainboard-0642.jpg

author: Lorenzo_1
author_rank: Regular Contributor
timestamp: June 27, 2021, 08:54:58 pm
content: Thanks for the ID. For some reason when I search for BA7K or BA7P I turn up nothing still. Must be search engine business. Links make perfect sense for this application.
Anyone repaired Ionmax ION390? Extra screws :/ - Page 1
Forum section: electronics / repair

author: LeWidget
author_rank: Regular Contributor
timestamp: April 27, 2023, 05:13:11 am
content: Hi all,Re-assembling a Ionmax ION390 air purifier after removing the top LCD control panel, I seem to have 2 extra screws that I, for the life of me, cannot see where they go. I've taken a couple of pictures, buuuuut there's always that one picture you need, but you didn't take :/.I know it's a long-shot but has anyone repaired this before would have an idea?

author: LeWidget
author_rank: Regular Contributor
timestamp: June 04, 2023, 05:09:01 pm
content: Not much luck with the screws, but it seems I have another issue. I noticed some legs were broken from what I assume is the LED backlight(?). Does anyone know the name of this part, whether it can be replaced or whether the piece I have is universal (ie I can get from Aliexpress)?

author: coromonadalix
author_rank: Super Contributor
timestamp: June 04, 2023, 09:19:47 pm
content: for the screwswell in some case dismantle everything again and check for missing screws who hold something ...
Anyone repaired the reverse direction switch on FA2 6/ 1BEK switch - Page 1
Forum section: electronics / repair

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 30, 2023, 07:45:37 am
content: Has anyone repaired the AC motor reverse direction switch on FA2 6 / 1BEK switch; the red curvereal case is it's not reverting nor cutting off ie. lockingPlease sincerely help just before being opened up and taken apart
Anyone repaired/replaced mouse (pcb mount) on G84-4400 keyboard? - Page 1
Forum section: electronics / repair

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 03, 2023, 08:17:42 pm
content: Anyone know if the mouse soldered to this PCB is a commodity item? I just picked up a usedG84-4400and the mouse feels worn out, very notchy especially in X-axis, left barely registers.I couldn't find the pcb mouse mouse assembly looking on alibaba/etc.No obvious markings except a serial# and QC sticker.

author: Kim Christensen
author_rank: Super Contributor
timestamp: February 04, 2023, 05:58:18 am
content: QuoteYou might want to search for the word "trackball" instead of "mouse".

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 04, 2023, 07:15:04 am
content: Quote from: Kim Christensen on February 04, 2023, 05:58:18 amI meant trackball. Not sure why I wrote mouse, repeatedly :-). Brain freeze lol

author: Ian.M
author_rank: Super Contributor
timestamp: February 04, 2023, 07:48:18 am
content: Unless there's surface damage to the big ball or the two rollers, or unless the clips the roller shafts run in are cracked, its very likely that carefully cleaning all the parts and applying a tiny drop of silicone oil to each clip that the shafts run in will make it mechanically run silky smooth again. The lack of responsiveness and skipping are probably due to dirty slotted encoder discs, mis-aligned opto-sensors, or low output from the IR LEDs illuminating them. Get in there with a two channel scope and check the quadrature signals as you spin the shafts.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: February 05, 2023, 08:54:36 pm
content: Quote from: Ian.M on February 04, 2023, 07:48:18 amThanks. I'll have to figure out how to take it apart. On a towel with lots of photos as it looks like there are a bunch of tiny parts inside.
[SOLVED] Anyone seen this manufacturer logo before looks fake  - Page 1
Forum section: electronics / repair

author: oddbondboris
author_rank: Contributor
timestamp: October 23, 2024, 07:44:31 pm
content: it's pretty obvious what the component is but the device (a bluetooth speaker) is full of fets with this logo some scorched on toplooks like alpha omega but drawn wrongwondered if anyone else ever came across this one

author: wraper
author_rank: Unknown
timestamp: October 23, 2024, 07:46:45 pm
content: VBsemi

author: oddbondboris
author_rank: Contributor
timestamp: October 23, 2024, 07:48:46 pm
content: wow that was fastthanks, i could have sworn i looked at that one but nope it's dead on

author: wraper
author_rank: Unknown
timestamp: October 23, 2024, 08:02:18 pm
content: Be aware that while this part is called SI4447ADY, its specs are very different from SI4447ADY from Vishay, actually it's quite a bit beefier, with 4x lower RDSon, 2x current rating and 2.5x gate charge. VBsemi is strange with their component naming, from what I've seen their parts often are significantly different from same part numbers of western brands. Like they have some component to sell and they just slap western part numbers without bothering if it's specs are actually similar.

author: oddbondboris
author_rank: Contributor
timestamp: October 23, 2024, 08:41:02 pm
content: thanks it doesn't really matter in this case as the driving circuitry is dead too and the board has shorted layers but i like to know for when i steal components to troubleshoot another board which datasheet to getany particular reason you think this is an si4447ady not an HM4447-vb? mostly wondering if there was something i missed, as far as i can tell all the si4447ady vbsemi parts have 4447a on them

author: wraper
author_rank: Unknown
timestamp: October 23, 2024, 09:48:30 pm
content: ^I stand corrected a little bit, it's either SI4447DY with no Ahttps://www.lcsc.com/product-detail/MOSFETs_VBsemi-Elec-SI4447DY-T1-E3-VB_C7568952.html(although it has exact same specs as VBsemi SI4447ADY, unlike quite different vishay A and non A parts) or HM4447-VBhttps://www.lcsc.com/product-detail/MOSFETs_VBsemi-Elec-HM4447-VB_C18212513.htmlVBsemi marking them with the same code does not help for sure.
Anyone understand on fridge fuse working mechanism ? - Page 1
Forum section: electronics / repair

author: abdulbadii
author_rank: Frequent Contributor
timestamp: January 11, 2023, 02:21:16 am
content: Anyone familiar or understand on fridge fuse working mechanism ?I'm almost blind about it

author: DavidKo
author_rank: Frequent Contributor
timestamp: January 11, 2023, 05:17:30 am
content: Do you mean the bimetal temperature fuse on the compressor? Fridge stops working and starts again in intervals, but it does not cool. In my case this was caused with defect "relay" for startup winding which had caused over heating.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: January 11, 2023, 05:30:42 am
content: If you are asking how the fuse (actually a switch) works, it is a simple bimetal disk formed into an appropriate dome shape. Contact is from the top of the dome and the rim. When the higher expansion coefficient metal on the outside of the dome expands enough it forces the dome to invert breaking contact.Depending on the metals and exact shape of the disk the inversion can be permanent, or reverse when the temperature drops again.In most cases the switching temperature is set at the manufacturer, but there are rare cases where an adjustment screw allows some tweeking.Googling "bimetal thermal switches" and "snap disks" should get you enough reading material to keep you going for weeks.

author: abdulbadii
author_rank: Frequent Contributor
timestamp: January 11, 2023, 06:23:54 am
content: What'd be the main purpose of airtight pouch there

author: Nusa
author_rank: Super Contributor
timestamp: January 11, 2023, 06:30:46 am
content: Keeps moisture out, which prevents corrosion.
Anyone used to or familiar in changing motor brush - Page 1
Forum section: electronics / repair

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 26, 2023, 04:00:53 am
content: Anyone used to or familiar in changing motor brush, as it broke, pulled out hard beyond its withstand but no successful search on its supplierThe drill is ATS BL-10KK, relatively rare to more common drill brands Bosch, Makita, JLD, DeWalt, Milwaukee, Wickes, Hitachi, as got that from yard saleso please one quite knows how to get its closest compatible from other brand to get it work normallythe connecting input,the carbon, case,Editthe carbon opening hole dimension:

author: max.wwwang
author_rank: Frequent Contributor
timestamp: March 26, 2023, 08:49:20 am
content: Carbon brushes of virtually whatever size can be found on Aliexpress at surprisingly low prices without any quality problems at all, based on my own experience.

author: Psi
author_rank: Super Contributor
timestamp: March 26, 2023, 08:58:28 am
content: If you can't find the right brushes that fit, then find something oversized and grind it down to fit.Carbon brushes are soft and easy to grind down with a bench grinder, orbital sander, or just a file.Be careful if using a power tool/grinder, brushes are softer than you think and it will take off material very quickly. A large file is probably safer.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: March 26, 2023, 11:25:10 am
content: ACE Hardware has some brushes, do not know if this is one of them.

author: mikerj
author_rank: Super Contributor
timestamp: March 26, 2023, 04:08:29 pm
content: Quote from: Psi on March 26, 2023, 08:58:28 amA flat surface and sand paper or emery is my preferred option.
Anyone who can rework LQFP100 in the US or even in Kensas ? - Page 1
Forum section: electronics / repair

author: Lucky1
author_rank: Newbie
timestamp: January 23, 2022, 05:35:37 pm
content: Hello,a friend of mine received 10 preassembled PCBs from china with the wrong CPU types soldered . He already has the correct CPUs but now he is looking for someone who can swap them. Is there anybody here who can help him ? Would be great if I would receive a PM with contact detailsof anyone willing to help.

author: whatboy
author_rank: Regular Contributor
timestamp: January 23, 2022, 09:47:36 pm
content: That is quite easy, like the KBC from laptops, but I am in Mexico... well... hope you find some one who can help!

author: mazurov
author_rank: Frequent Contributor
timestamp: January 24, 2022, 01:19:57 am
content: Search for 'PCB rework services', there are more than a couple in the US. They are all very expensive.

author: jpanhalt
author_rank: Super Contributor
timestamp: January 24, 2022, 10:41:59 am
content: Replacing that device by hand should be doable. I did a 64-pin version using ordinary hand tools. If your friend is in Kansas, particularly in the Wichita area, I suspect there may be local avionics shops that could help. How crowded is the board? A picture might help to access the difficulty.

author: Lucky1
author_rank: Newbie
timestamp: January 24, 2022, 12:43:00 pm
content: Quote from: jpanhalt on January 24, 2022, 10:41:59 amYes it is definitely doable. I did it several times myself using a hot air rework station to desolder and a small soldering tip to solder the new one. Unfortunatelly I´m in germany and not in the US and shipping has become so expensive.Here is a picture

author: jpanhalt
author_rank: Super Contributor
timestamp: January 24, 2022, 12:46:28 pm
content: That doesn't look too crowded. The device I did had a little speaker next to it that had to be shielded from hot air. I am not looking to do it though.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: January 24, 2022, 01:04:58 pm
content: Quote from: mazurov on January 24, 2022, 01:19:57 amLook for someone local who does component-level mobile phone/laptop repairs - likely to be much cheaper than more industrial places.

author: whatboy
author_rank: Regular Contributor
timestamp: January 24, 2022, 06:14:29 pm
content: maybe you can find some one here!!!https://repairlegion.com/repair

author: ledtester
author_rank: Super Contributor
timestamp: January 24, 2022, 06:26:16 pm
content: I'd also search meetup / craigslist / facebook for a local electronics enthusiasts / makers / makerspaces. Could generate some leads to people with the right equipment and skills.Example of a makerspace in Wichita:http://makeict.org/
Anyone who owns HP105B (later model) please check the voltage.... - Page 1
Forum section: electronics / repair

author: tkamiya
author_rank: Super Contributor
timestamp: November 30, 2020, 12:54:00 am
content: Whoever owns HP105B with HP10811 oscillator, please check the voltage at pin 14 of the OCXO and pin 15, the ground? Do you read 24V or 18.7V?

author: Bill158
author_rank: Regular Contributor
timestamp: November 30, 2020, 08:55:28 pm
content: Quote from: tkamiya on November 30, 2020, 12:54:00 amMine is about 18 volts because of the A1A3 power supply assembly that the 10811/10544 oscillator module plugs into. The A1A3 circuit has a 18 volt regulator IC (A1U1) that reduces the 24 volts from the 105B power supply. Then there is another IC (A1A3 U1) that reduces the 18 volts to 12 volts for the oscillator supply. See the pdf "hp-00105-6100-figs.pdf" attached. At least this is what my 105B has installed.Bill

author: tkamiya
author_rank: Super Contributor
timestamp: November 30, 2020, 09:29:13 pm
content: Thank you. That's what I get also.I wanted to confirm it with other owners as HP's diagrams are so hard to read. I took out the oscillator board, and on back of it, there is a screen printing that says 18V as well. I didn't see that before.
AOC CM 312 monitor problem. - Page 1
Forum section: electronics / repair

author: Anderslober
author_rank: Newbie
timestamp: November 15, 2023, 12:37:36 pm
content: Hello forum. Just a quick question. I need to know the value of R750 and ZD750 on the crt board of this cm312 monitor. I cant find a good SM.I hope to get some help. Thanks. See picture for position. Picture is from forum.

author: sean0118
author_rank: Frequent Contributor
timestamp: November 15, 2023, 11:51:14 pm
content: Hey, I've attached the schematic I have, but the value for ZD750 is unreadable. Maybe 6.8V ?I still have my Commodore CM312, so can open it and have a look this weekendedit: 12V rail so the zener is probably 12V?

author: Anderslober
author_rank: Newbie
timestamp: November 16, 2023, 02:59:36 am
content: Wow…thanks for the great info! Highly appreciated if you can check too. 👍🍻 R750 is 75 ohm. Zd750 possibly a 12v zener.The resistor and zener were both fried.

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 16, 2023, 11:00:02 am
content: I think, looking at other commodore monitor schematics, that the zener is 93D39-68 which would make it 6.8V and that makes no sense on a 12V lineSo 12V would be a good choise, probably the zener shorted and smoked the resistor.

author: Anderslober
author_rank: Newbie
timestamp: November 16, 2023, 04:31:02 pm
content: Yes…I changed to a 12v zener and new 75 ohm resistor. I have power and crt elements are glowing, BuT, no life in display….ideas welcome….I have checked anode cap..all is good….still no display…..

author: BlownUpCapacitor
author_rank: Frequent Contributor
timestamp: November 16, 2023, 08:34:11 pm
content: If there is no beam at all, check the pre acceleration voltage. If that still checks out good, that must mean CRT is working. Or is it?To check if the CRT will still even display any kind of beam, disconnect the wires to the electron gun grids. Manually drive the grids and see if a beam appears.

author: Anderslober
author_rank: Newbie
timestamp: November 17, 2023, 09:11:19 am
content: Pre-acceleration voltage…..where exactly would I check this on this cm312 monitor? Does the anode cap transformer ever go bad?Strange this…..

author: sean0118
author_rank: Frequent Contributor
timestamp: November 18, 2023, 03:42:20 am
content: Quote from: Anderslober on November 16, 2023, 04:31:02 pmI measured mine and get 12.7V across the zener so your replacement should be correct. Resistor on mine is also 75ohm.I'm not sure if my CRT is fixed (I need a CGA card to test) but I do get a raster with no input connected. Let me know if you want me to measure any other voltages for comparison.

author: BlownUpCapacitor
author_rank: Frequent Contributor
timestamp: November 21, 2023, 06:41:45 pm
content: Quote from: Anderslober on November 17, 2023, 09:11:19 amI wouldn't know for thisexactCRT monitor without the service manual, but you can try finding the pin to measure from by looking at the electron gun construction.
AOC Monitor - Thin Blue Vertical Line - Page 1
Forum section: electronics / repair

author: 2X
author_rank: Frequent Contributor
timestamp: August 03, 2024, 07:29:37 pm
content: Hello,I have the below AOC (E2275SWJ) monitor and always shows me a thin blue vertical line.I moved back and forth the connectors and the COF tabs but the vertical line didn't disappeared with any movement at all.Do you know If there is any solution?

author: wasedadoc
author_rank: Super Contributor
timestamp: August 03, 2024, 07:43:36 pm
content: There are not enough connections to have one per column so almost certainly this is a fault within the panel and unfixable.
Aogee Alta E47 trouble - Page 1
Forum section: electronics / repair

author: LSPD
author_rank: Newbie
timestamp: September 19, 2024, 07:44:51 pm
content: Hi there,After several months of trouble-free operation, I cooled My Apogee Alta E47 camera to -25 C and it produced this image yesterday. In the past weeks it was running at -15, -20C because the nights were very warm. The pattern is similar regardless of whether the CCD is cooled and also largely independent of exposure. All pixel values are close to 65000.Does anyone have an insight into what might be going on?I'd apprecite any help.Laszlo
AOIP MN5128+AOIP MN5127 - Page 1
Forum section: electronics / repair

author: lionelkjh
author_rank: Frequent Contributor
timestamp: March 26, 2020, 06:25:32 pm
content: Good evening everyone! I am looking for the diagram of the AOIP MN5128 table multimeter, and I have another AOIP MN5127 table multimeter with a missing TR1 power transformer (it is blue), for this I am looking for the secondary power / voltage characteristics (see photos). Thank you very much for your kindness if you can help me out on these two broken devices.
Aoyue 701 Schematic Identification - Page 1
Forum section: electronics / repair

author: henas
author_rank: Contributor
timestamp: April 26, 2019, 10:23:31 pm
content: I have Aoyue 701 vacuum desoldering/solder station not an "A" version which I bought on Ebay more than a decade ago. I believe this was knock of the original Hakko 701. Playing with heating elements I managed to short solder part of the circuit. Desolder gun still works fine. Unfortunately two Ics 14 pin and 6 pin have their marking physically removed. The six pin Ic appear to be driver for the triac and seems to be OK but the 14 pin Ic is cooked. I suspect this is quad Op-Amp, maybe TL074.Someone might know what IC's were used on this Chinese knock off. I suspect the same as on the original Hakko 701I already ordered controller for heating element from Ebay never less would be nice to have it repaired.
AOYUE Int 852 Hot Air Station - Page 1
Forum section: electronics / repair

author: santosp
author_rank: Contributor
timestamp: May 04, 2019, 01:27:59 pm
content: In case who someone hears a continuous small buzz with the station being connected to the outlet socket but in a power off state, then change the C11 ceramic capacitor. Its value is 10 nano @ 1000 Volt DC.I live in Europe so my model is 220 V AC type.In mine I had also change all these jerky Chinese electrolytic capacitors, in order to achieve somewhat more stable operation.

author: wraper
author_rank: Unknown
timestamp: May 04, 2019, 01:36:10 pm
content: It's not ceramic but film capacitor. Also it seems that you replaced 1000V cap with 400V cap with twice of capacitance. If this cap is under 220V AC, then 400V DC rating is too small, should be at least 630V or X2 safety cap.

author: santosp
author_rank: Contributor
timestamp: May 04, 2019, 01:44:20 pm
content: Quote from: wraper on May 04, 2019, 01:44:20 pmYes you are right is type film capacitor. As for the picture is only to see the point.I have replace mine with a new of 10 nano @ 275 Volt AC
Aoyue membrane keyboard failure - Page 1
Forum section: electronics / repair

author: dorkshoei
author_rank: Frequent Contributor
timestamp: March 29, 2021, 08:31:55 pm
content: I have an Aoyue 701A++https://www.sra-solder.com/aoyue-701a-all-digital-dual-function-soldering-and-desoldering-station-4239The membrane for the soldering iron on/off had cracked and the button had also stopped working.If you remove the case, the display pcb is secured by 4 screws. The heads of the screws are under the front membrane and there was thread lock on the upper two.I used a pair of needle nose pliars to grab tightly the rubber stand off under the pcb (around the bolt thread) so I could break the nut off. Then used a tap/die to remove the thread lock.I was able to unjam the button. I glued a thin piece of plastic to the underside of the cracked membrane.Correct button operation is dependent on how tightly you retighten the nuts, so test all buttons before putting cover back on.

author: t1d
author_rank: Super Contributor
timestamp: April 01, 2021, 04:02:04 am
content: I just wanted to say, on behalf of the DIY community, thank you for posting your solution. Your extra effort to post your experience is what makes the DIY community work. Much appreciated.

author: highpower
author_rank: Regular Contributor
timestamp: April 01, 2021, 04:11:11 am
content: For what it is worth, I have an Aoyue 852A ++ rework station that had a problem with it when I bought it. The front label was installed slightly off center which caused the on/off button to rub on the side of the hole that is punched in the label for the switch button to pass through. That in turn caused the switch button to get stuck when it was pushed in and it wouldn't pop back out. I called SRA and asked if they could send me a new label for it, and they did.It was simple enough to heat up the label a bit and peel it off and then stick the new one on - but centered this time.Maybe they can do the same for you?
AP 2722 show error (8070) : dsp host vector not available - Page 1
Forum section: electronics / repair

author: blueangel
author_rank: Newbie
timestamp: June 15, 2024, 06:28:42 am
content: Our 2722 show error (8070) :dsp host vector not available. If it possable I can fix it myself ? Seem no service manual can reference.Does some one can help ? I already check all power supply are normal ,and connect checked also. But I don't know DSP HOST VECTOR issue need to check which board.Thank you very much.

author: blueangel
author_rank: Newbie
timestamp: June 21, 2024, 03:13:23 am
content: Update....I found that don't power on AP2722 , Run APP first , when screen show four items and wait for select, then power on AP2722 , and choise 2 or 3 or 4 , AP2722 will work. If choise item 1 ,same error message will pop up.I don't know what cause it...
APART REVAMP 4120T PUBLIC ADDRESS AMP - Page 1
Forum section: electronics / repair

author: geobee
author_rank: Contributor
timestamp: May 10, 2021, 05:26:00 am
content: Hi all, hope someone has had luck with one of these. Appears that the SMPS has gone down, but I have been all over it and cannot find anything that would give a clue to the shutdown. Unless it is a SM component on the rear of the board,(my eyes are failing me these days), it has me beat. None of the electro's appear to be under strain, and metering them in circuit appears to show the correct values. Any ideas would be great if anyone has worked on one of these Chinese made, but seems to be well made, I must add.
APC 10KVA UPS reapir - Page 1
Forum section: electronics / repair

author: sushilx
author_rank: Newbie
timestamp: September 26, 2025, 05:40:14 am
content: Need help in reset nvram or factory reset the APC UPS SRT10KXLIthe error is P13 (event ID 107) inverter board failure, found the output/scr/triac circuit Q1433 failed.After replacing the Triac the system is not coming up as expected, since the error is latched and need nvram/factory reset orclear some register bit as per service manual.The UPS manufactured on 2021 and is out of warranty any hep appreciated.error details as per service manual :Inverter Hardware ErrorEvent Code: 107Detection Method: This is a hardware signal to detect this error. This signal is monitored in ADCinterrupt @40kHz.Hardware Signal: CPLD - /INV_FLTRecovery Mechanism: This error is latched and hence user cannot clear it. This error will be clearedonly by recycling power and setting the factory usage.Power1:UPSSystem.ManufacturerData.Upsf:F_COM2UPS_Data_BF bit 8 – ResetIgbtError [IGBTerror is latched. Use this bit to clear it].

author: darkspr1te
author_rank: Frequent Contributor
timestamp: September 26, 2025, 01:46:35 pm
content: On the older serial models sending CTRL+Z would cause the system to reset, how ever you need to ensure it's battery is fully charged as this also resets the power/battery specs ,i would search APC UPS protocol, in that protocol are registers to set mains voltage, battery voltage taht need to be reset (e.g my 240 model would reset to 110v and trigger voltage too high error so i would have to disconnect from main power, change mains voltage value 110/120/220/230/240 )darkspr1te

author: coromonadalix
author_rank: Super Contributor
timestamp: September 26, 2025, 05:51:06 pm
content: dont know if a video like this can help ?you have other videos for the srt hard reset but but in english

author: sushilx
author_rank: Newbie
timestamp: September 28, 2025, 04:55:42 am
content: Thanks, i tried all this options.i think new models there is some change.
APC ACF600 fan replacement model - Page 1
Forum section: electronics / repair

author: syberia81
author_rank: Newbie
timestamp: January 16, 2021, 10:24:31 pm
content: One of the 4 fans in my ACF600 is dead. Any idea of the reference for a fan to replace the dead one? After taking off the dead fan, there is no reference on it except sunon, I deduce that it is a sunon fan, 92x92x25 dimension, 12V DC, around 135/4=33 CFM, no speed signal, just ground and 12 V. Does any one has an idea of the sunon reference to use for a replacement? Thank you
APC BR1500 Smart Ups RS 1500  Repair:  Starts up, then ends in Overload - Page 1
Forum section: electronics / repair

author: MrCreosote
author_rank: Contributor
timestamp: October 23, 2024, 05:40:23 am
content: First, mine looks identical to this one:https://www.eevblog.com/forum/repair/apc-smart-ups-sc1500-service-manual/When turned on:On-Line: flashes green for about 5 secondsOn-Battery: spikes yellow for a split secondOverload: lights continuously red & buzzer constantI've looked over the board while still connected in case and found nothing physical.Need to disconnect and remove board for better look.The fact that it goes thru the startup sequence leads me to think it may be a simple repair.There more to the history of this UPS:A few years ago, I decommissioned when I measure 135v while On-Battery. May have been a non-True RMS DMM, which means the 135v is a low reading.This alone might be reason enough to trash this unit, but I really don't know what to expect from a modified sine wave. Mains here are 125v now and probably >120v back then.It's also disturbing that sitting on the shelf, it appears to have developed new malfunctions.The link to the other unit mention the MOSFET's which might make sense.The fact that it instantly drops out of On-Battery while not showing Replace Battery suggests the inverter is not working?Could the high voltage On Battery have blown the MOSFET's?I've done simple electronic repair and can deal with transistors, SCR's, etc. but when it comes to logic chips, no experience - so it will probably take me a long time to do this repair....and then there's the need for a schematic that may or may not help me either.ThanksTomTried to attach a pic, but it keeps truncating to a square aspect ratio.
APC ES 550 UPS - unnecessary beeping - Page 1
Forum section: electronics / repair

author: Peabody
author_rank: Super Contributor
timestamp: June 18, 2023, 10:30:03 pm
content: It's also known as the BE550G. When the power goes out, it takes over as expected, but just a few minutes later goes into rapid continuous beeping mode (2Hz), which is supposed to indicate that the battery is almost fully discharged.I set up a test. I took out the battery and charged it on my auto battery minder, which took it to 13.25V. Then I put it back in the USP and let it continue to charge. After about an hour it had leveled off at 13.51V.Then I plugged in a 5W night light, disconnected the mains, and the UPS fired up. But after about four minutes it wen't into rapid beeping mode, and the voltage at that point was 12.68V. But it continued to power the night light just fine, and 20 minutes later the battery voltage was only down to 12.66V, which I don't think is almost fully discharged.So it seems to me that everything is working fine, except that whatever is measuring battery voltage is broken. It thinks the battery is way down when it really isn't. It's a new battery, by the way.I can always just disconnect the beeper, but I wondered if anyone else here might have run across this problem and found a specific fix. Also, am I wrong about the battery being almost *fully* charged at 12.66V, nowhere near fully discharged? It's the typical 12V SLA battery. It looks like the battery terminals feed into a large transformer, but I don't see them going anywhere else.

author: Peabody
author_rank: Super Contributor
timestamp: June 19, 2023, 12:53:49 am
content: Well never mind. I messed around with it, and now it doesn't work at all. So I'll get a new one.
APC rack PDU AP8632 communication problem - Page 1
Forum section: electronics / repair

author: syberia81
author_rank: Newbie
timestamp: January 16, 2021, 10:38:07 pm
content: For some days, I have a flood of email on my AP8632 that are saying: component communications lost with outlet board 1 meter, component communications lost with outlet board 2 meter, component communications lost with outlet board 3 meter, component communications lost with phase meter, communications lost, NMC CAN bus off, NMC CAN bus off cleared, .... Also every measure are 0 for Volt and Ampere.I got around 2 messages by minute. I follow the APC recommandations, unplug the display module and plug it again. Nothing change and errors come again.But, I just remark that the cable for the display module has some angles, and due to that I suspect that there could a bad electric contact in this cable, which could cause the problem.May a have a good guess or do you have any other ideas for such a problem. Thank you.
APC Smart-UPS RT 3000VA Online-UPS Fan issue / replacement - Page 1
Forum section: electronics / repair

author: FabianLPHD
author_rank: Contributor
timestamp: March 29, 2022, 06:12:48 am
content: Hey there,maybe someone know an easy fix to replace the stock fan with a silent fan.The stock fan has only positiv and negativ 24V, so it's voltage controlled.I tried a noctua nf-a14 industrialppc-24v-3000 but with it the USV has a fan error.Don't know how the UPS detects the fan... maybe consumption?APC replied to me that i have to buy a new UPS because it's old and no replacement parts are available anymore.Thanks in advance and greetings from germany.
APC Smart-UPS SUA2200XL acting weird - Page 1
Forum section: electronics / repair

author: carloscbj89
author_rank: Newbie
timestamp: July 09, 2019, 03:46:35 am
content: I have a Smart-UPS SUA2200XL which was acquired in 2009. About a month ago the bad battery alarm and red light came up. I took out the batteries and found two out of four that were not charging more than 9V while the other two stay at 13.24V steady. The two working 12V batteries are 18ah and I purchased two 12V 20ah. The 2ah difference shouldn't be a problem it just means the other two 12V batteries would last longer. So I installed the two new batteries and the UPS seems to work fine. I let it run and charge for 24 hours, the battery light shows full charge on the UPS and as soon as I do a self-test using the powerchute business web app, the battery light drops to one light of charge and the replace battery light comes up. I removed all four batteries and check their voltage and all four are registering 12.84V steady. I left the batteries out for 24 hours and still holding the same voltage value. I don't know how I can determine whether this UPS is broken or if the batteries are bad. I don't know what else to do, the event log in the web app shows replace battery logsAny suggestions? Thank you!

author: sokoloff
author_rank: Super Contributor
timestamp: July 09, 2019, 03:53:02 am
content: Do a load test on the batteries. Get a 12V lamp with a decent brightness (minimum brake light, but better an old halogen headlamp) and put it on each battery in isolation as a load. Test the voltage on the battery while the load is on it.

author: Bratster
author_rank: Frequent Contributor
timestamp: July 09, 2019, 05:58:12 am
content: I'm pretty sure that UPS has the batteries set up for 48 volts DC. So all four batteries are in series.It is highly likely that the two batteries left over from the original batch, that you thought were good since the voltage was okay, are actually very much dead.but they happen to be just barely good enough that they will float at the correct voltage, and everything looks okay until you put a load on it.whenever you have a battery bank setup of multiple batteries in series, it is best to replace all of them at the same time so they are the same age and same capacity.Sent from my Pixel 2 XL using Tapatalk

author: carloscbj89
author_rank: Newbie
timestamp: July 11, 2019, 01:40:31 am
content: Thank you both for your suggestions. I took the two batteries from the old batch and attached them to a powerwheels I have at home. Even though both batteries show 13.34V as soon as I connected them to the powerwheels and tried to turn on the motor, the batteries dropped to 0V. I connected the other two new batteries and the powerwheels ran fine with no issues dropping to 11V. So it's definitely the batteries that are not providing any electrical energy, even though they seem to hold 13.34V they are dead. Now I gotta spend more money and buy two new batteries.
APC SmartUPS 3000 - Page 1
Forum section: electronics / repair

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 01, 2020, 09:16:17 pm
content: The batteries appeared to have failed on this APC SmartUPS-3000 I use to run a server rack. Fine, I order new batteries, they show up, install them, I run a battery calibration and it shuts down after 2 minutes. I'm running about 20% load (approx 600 VA), it should run for over an hour. It thinks I have 4 minutes total of capacity. So I think one of the new batteries must be bad. I rig up a load tester and run them at 3A, there's a little variation, but the worst is still roughly 15AH.So, maybe it only shows up under load. I put them back in the UPS and monitor the battery voltages and current during a calibration run. One battery looks a little iffy, but the discharge curves are looking fine (see attached) At then end of 140 seconds the UPS thinks I only have 2 minutes left. Now I'm wondering if the monitoring circuitry in the UPS went squirelly. Or is that one battery really that bad? Anyone have any idea what to look for?These are 12V 18AH AGM batteries

author: asis
author_rank: Frequent Contributor
timestamp: August 01, 2020, 10:56:12 pm
content: Hi,Are you running the calibration over LAN or RS232?To calibrate, you need to fully charge the batteries and load more than 30% of the rated power of the UPS.Load up with something extra.After starting the calibration, the UPS will transfer to batteries and the controller will build a time remaining ramp, after which it will return to mains power. It will take 10-15 minutes.If the calibration does not give results, it will be necessary to reset the value of register 00 to (FF) through the terminal program and repeat all over again.

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 02, 2020, 12:22:20 am
content: Batteries are fully charged, I'm using apctest over a smart cable. I'll try increasing the load and see if that does anything.

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 02, 2020, 05:11:27 pm
content: OK, the issue looks to have been the battery constant had drifted too low for the firmware to reevaluate. Got it reset and things are working fine again.

author: asis
author_rank: Frequent Contributor
timestamp: August 02, 2020, 11:46:50 pm
content: It is advisable to indicate the date of battery replacement in the appropriate register.

author: PaulAm
author_rank: Frequent Contributor
timestamp: August 03, 2020, 12:18:22 am
content: Of course, that was already done.Been changing batteries on UPSes for 20 years and never had this happen to me. Did have another 3KVA UPS die on me though. That one's on the repair queue.
APC SMT 1000i smart ups blown capacitor value - Page 1
Forum section: electronics / repair

author: pval
author_rank: Newbie
timestamp: December 28, 2023, 03:36:42 pm
content: I wonder if someone has any idea about the value of the blown ceramic capacitor beside the 47K resistor. The photos are from the small PCB located on the rear of my APC SMT 1000i smart ups. The ups works but the pcb emits a terrible smell. One end of the 47K resistor has been desoldered, the other resistor is 51 ohm and both of them are ok. I searched but didn't find any schematics.

author: floobydust
author_rank: Super Contributor
timestamp: December 28, 2023, 08:41:20 pm
content: Welcome to the forumsIt's the snubber capacitor and I would wildly guess around 4.7nF at 500-1,000V rating.But the PC board looks carbonized so you'd have to consider going through-hole to salvage it.

author: asis
author_rank: Frequent Contributor
timestamp: December 28, 2023, 11:02:24 pm
content: Hi,https://www.eevblog.com/forum/repair/apc-smt1500i-problem/

author: pval
author_rank: Newbie
timestamp: December 29, 2023, 02:18:34 pm
content: Thank you

author: Purduephotog
author_rank: Regular Contributor
timestamp: February 02, 2024, 12:34:39 am
content: Consider writing APC /Eaton about it. They ended up sending me an entirely new unit, although I did have a rather large fire in mine.

author: RLP
author_rank: Contributor
timestamp: March 14, 2024, 12:16:40 pm
content: I've had 2-3 of these boards fail this way. That's a pretty bad case - I managed to shut mine down prior to them degrading to this point. What happens, I believe, is that the switching transformer itself starts to fail internally first - and then that is what causes the switching controller and its snubber circuit to overheat, damaging the components and burning the board as you see there.You (or others having this issue) may be able to find replacement boards by searching the board number on eBay or similar. But make sure to get the correct version (120V or 230V - they both have the same part number but different components!). Otherwise, an option to salvage the rest of the UPS is to 'amputate' this board altogether and disable green mode as per this thread:https://www.eevblog.com/forum/repair/how-to-disable-green-mode-on-apc-smart-ups-smt-series/
APC SMT750i is buzzing loudly while on battery with minimal or no load. - Page 1
Forum section: electronics / repair

author: Alex_N
author_rank: Newbie
timestamp: October 14, 2025, 11:09:03 pm
content: Hi,I bought the UPS new in 2015. A couple of months ago, I started noticing an intermittent buzzing sound when it was running on battery power. However, it wasn't much different from the usual buzzing sound it always made.Two weeks ago, during a blackout, the buzzing was intermittent, louder than before, and something started to smell like burnt plastic. I quickly turned the UPS off. I opened it and found burn marks on two capacitors of the SMPS that handle Green Mode (C900, a 10 nF SMD ceramic capacitor and C910, a 0.1 µF film capacitor, schematic link here:https://www.eevblog.com/forum/repair/apc-smt1500i-problem/?action=dlattach;attach=1999276). I also found some swollen electrolytic capacitors on both the SMPS and the main board.I checked and replaced all the bad electrolytic capacitors on both the SMPS and the main board. I also replaced the burnt ones. I put the UPS back together and tested it with and without a load. Everything seemed okay, there was no more unusual loud buzzing.Today, there was another blackout. I was using the PC, and everything was fine until I turned it off. When the load on the UPS dropped to about 25 W (in addition to the PC, I have some network equipment connected to it), the loud, intermittent buzzing sound returned. When the power returned, I ran some self-tests while increasing the power load. The loud sound stops when the load on the UPS reaches about 35W. What could be causing the sound?This is a recording of the sound during a self-test with the PC turned off and a load of about 25W.Thank you.
APC SRT 5000 UPS - part identification. - Page 1
Forum section: electronics / repair

author: justinjja
author_rank: Regular Contributor
timestamp: August 29, 2022, 10:46:41 pm
content: Does anyone recognize the markings on this fuse?Its a 5000w ups only a few months out of warranty.Can run from the batteries, but won’t charge the batteries.

author: TheMG
author_rank: Frequent Contributor
timestamp: August 29, 2022, 11:28:28 pm
content: Littelfuse 808 series fuse, 3 amp.https://www.littelfuse.com/media?resourcetype=datasheets&itemid=ed55d3b3-c0da-4a69-9457-2eb3ae7144d9&filename=littelfuse-fuse-808-datasheetObviously, something else in the circuit probably failed if the fuse blew like that (looks like it would have been a dead short, not just a slight overload, from all of the vaporized metal expelled from the fuse.