hybridfree/eevblog-posts huggingface dataset:
Weird Problem with ISDN Telephone (ELMEG CS 410) - Page 1
Forum section: electronics / repair

author: MagnumGR
author_rank: Newbie
timestamp: March 26, 2020, 02:08:51 pm
content: HiI have an ISDN telephone, the ELMEG CS 410 (S0) which my last months have the following problem:It is attached to my ISDN PBX, when on the phone, i detach - attach the telephone cord (S0) or when the PBX restart for reason like power failure etc., the phone is DEAD it's not power up !If i connect the telephone (ELMEG) to another telephone line (S0), it's also dead .If i connect another ISDN telephone to the telephone cord (S0), it working normally !If i leave the specific device several days (over 10 days) disconnected from the line S0, when i reconnect to it (S0) it power up and it works !!Over the past two months, however, without any interrupt (power failure etc) the phone suddenly, it's act like taking reboot but then it's power off with the same symptom as above.So I opened it and saw the board:At first glance I looked for bad capacitors but optical all is in good shape.I want to try to change the capacitors, but i 'm not sure for the exact type because it's SMD capacitors.Is the following correct ?Pieces >Marking > Type1x> 3V 470 6.3V -> 470mF 6.3V (?)5x> m3 10 16V -> 10mF 16V (?)1x> 45 1 100V -> 1mF 100V (?)1x> 431 22 50Z ->?1x> 422 100 6E ->?Any other suggestion to look for ?

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 28, 2020, 10:02:58 am
content: Good idea for the SMD electrolytics, you have the values right if you meant μF rather than the mF you wrote.Leave the tantalums alone.I'd definitely check the solders at the white transformer between the buzzer and RJ45 sockets, they look bad on your picture as far as I can tell.

author: MagnumGR
author_rank: Newbie
timestamp: March 29, 2020, 08:53:30 am
content: Thanks for your reply !Tantalums is the last 2 capacitors that i don't understood what type is ?

author: Twoflower
author_rank: Frequent Contributor
timestamp: March 29, 2020, 09:55:04 am
content: Check the ferrite on the left center (close to the elmeg lettering). It looks like the placement was off quite a bit. On the picture it looks like that at least one of the pads (Pin 8) is discolored (caused by bridging the pin-pad gap by sparks?).OK, shakalnokturn saw it first, and I haven't read all replies...
Weird problem with modern kitchen hood - Page 1
Forum section: electronics / repair

author: RiRaRi
author_rank: Regular Contributor
timestamp: September 28, 2023, 10:09:14 pm
content: Hello. My 5 years old kitchen hood suddenly stopped working, completely. There are two PCBs inside. Main one with transformer and relays. And second one with touch-sensitive buttons. On the power supply board i tested everything i could: capacitor, thermistor, relays, graetz connection etc. and it all measures good. Second one is full of small SMD components which i can not fully test. Connection between two PCBs is tested and fully working and connecting as it should.Things that i noticed:When i connect touch panel to power supply PCB, transformer starts to heat very much (can not be hold with hands), and voltage drops from 17.5V to 2.9V. Transformer is rated to 9V. Without any load and only connected to main PCB without touch panel/fan/lights measures 17.5V.I did test with programmable DC PSU which i connected after graetz connection and when touch panel is disconected it measures no current but when i connect touch panel it reaches limit (draws more then 3A current). Here is video of my test:https://youtube.com/shorts/r7lAetzZ0N4When i connect touch panel half-way and at angle LEDs starts to work, and at other angle fan is working but touch sensitive switches does not work.When i power up switch PCB with my adjustable PSU it is short.PS All connections and wire between touch panel and main panel are tested and they are good, so it is not bad plug.Also, 4 of 6 (total) pins on switch panel are fully connected to each other.Here are photos of both PCBThanks for your help.

author: RiRaRi
author_rank: Regular Contributor
timestamp: September 28, 2023, 10:09:47 pm
content: Power supply panel

author: RiRaRi
author_rank: Regular Contributor
timestamp: September 29, 2023, 04:52:22 pm
content: Can anyone help?

author: blauerscharik
author_rank: Regular Contributor
timestamp: September 29, 2023, 05:56:15 pm
content: With 3A shouldn't you be able to see what gets hot? With a thermal camera or some alcohol or touching?

author: RiRaRi
author_rank: Regular Contributor
timestamp: September 29, 2023, 10:53:28 pm
content: I dont have thermal camera. How to test with IPA?

author: fzabkar
author_rank: Super Contributor
timestamp: September 29, 2023, 11:32:15 pm
content: U1 appears to be a linear regulator. If so, check the resistance between Ground and each of Vin and Vout.Can you identify the markings on all your ICs?

author: blauerscharik
author_rank: Regular Contributor
timestamp: September 30, 2023, 07:48:33 am
content: Quote from: RiRaRi on September 29, 2023, 10:53:28 pmIf a component is shorted then you would be able to touch the board and find the general area where it is getting warm/hot. And then I would put a couple droplets of IPA in that area and see where it evaporates fastest and that would be your shorted component.
Weird relay size (12mm by 15mm pin pitch) - Page 1
Forum section: electronics / repair

author: staze
author_rank: Frequent Contributor
timestamp: July 18, 2019, 01:59:28 am
content: Hi All,I'm trying to find a replacement relay (General Purpose) that's 250v 10a switching, with a 24v coil. But the pin pitch is weird. Standard GP relays seem to all be 12.2mm by 12mm pin pitch for the main 4 pins (the 5th is offset).This device is from the early 90's and rather than 12.2mm, the pitch is 15mm.Anyone have any ideas?
Weller 6966 hot air gun repair - ‘interesting’  design ! - Page 1
Forum section: electronics / repair

author: Fraser
author_rank: Super Contributor
timestamp: May 12, 2023, 04:16:12 pm
content: I recently purchased a ‘customer return’ Weller 6966 hot air gun to see if I could resurrect it from the grave. I was expecting an open circuit thermal fuse but found something more unusual. Upon testing the unit the fault was no motor operation but the heater still worked. An unusual situation and thankfully the heater did not burn-out.I had a spare few minutes today to investigate the fault and got a bit of a surprise when I opened the heat gun to examine its internals.I reverse engineered the wiring and components of the heat gun and it is simple but of somewhat unusual design. No PCB’s, just point to point wiring with a mix of crimped connections. Solder ‘lands’ were created using brass eyelets in the fans ABS plastic casing ! It is all a bit Heath Robinson and, whilst it is likely safe, it triggers my ‘good design and engineering practices’ OCD somewhat.The fault turned out to be the resistor that is mounted inside the fan snail shell housing. One leg was dry jointed and had disconnected from the brass eyelet. It is clever to use the fan to cool the resistor in this way, but the whole design makes me think no one has reviewed it since it was likely created in the 1970’s ! These Weller 6966 heat guns can still be bought new and are not cheap at over £200.I will happily use this heat gun as it is safe, but she sure is an ugly beast inside that casing.I attach some photos for interest and will also include the schematic that I found after reverse engineering my particular model. Sorry about the picture quality, I was not intending them to be used on this forum but thought they might be of interest.Fraser

author: Fraser
author_rank: Super Contributor
timestamp: May 12, 2023, 04:28:17 pm
content: The schematic and case layout diagram.The resistor that had effectively become open circuit was the 850 Ohm ceramic that is mounted inside the fan housing and connects to the Neutral (Blue) side of the mains lead via a thermal fuse. One leg of the resistor was a dry solder joint and it would appear that the heat gun was dropped, dislodging the large resistor from the brass eyelet connection point. The user manual warns that soldering to the brass eyelets must be done with care as the ABS plastic around them melts !Fraser
Weller 81 Soldering Iron Problem: No Heat and Display Cycling - Page 1
Forum section: electronics / repair

author: Bill Johnson
author_rank: Newbie
timestamp: January 30, 2024, 02:38:26 pm
content: Hello,I have a Weller 81 soldering iron that is not heating up when turned on. The digital display on the soldering iron shows three different patterns in a repeating cycle. I would like to know what could be causing this issue. Thank you for your assistance.
Weller AG701 Hot air solder station - Page 1
Forum section: electronics / repair

author: hoei
author_rank: Newbie
timestamp: May 07, 2020, 09:52:40 am
content: Pump is working, but heater wont come on no matter the temperature knob setting.I've dissambled the cable connector for the pen, and was surprised to find only 3 wires going to the pen. Two black wires, apparently for a 5 ohm heating element, a white wire for chassis. Also there is a small PCB inside the connector (see reverse engineered schematic). Adjusting the potmeter makes no difference.Interestingly, I am able to make the lamp come on (albeit dim) by connecting a 1K - 5K6 resistor over pin 3+4- Has anyone experience with this device?- Is it even worth bothering with a solder station without a proper temperature sensor? I wonder how the regulation is done.

author: hoei
author_rank: Newbie
timestamp: May 08, 2020, 11:24:25 am
content: Ok, so took the case apart and found out that the temperature control pot is not getting any supply voltage at all. It is connected to a transistor T1 (only TO-92 on the board) which seem to be a darlington. Marking is "bl" , "C617".Anyway, I didn't get much further because suddenly the 8V dc supply blew up, so now I have to replace one of the bridge diodes and the 8V regulator L7808CV.
Weller crosscompatibility or mods? - Page 1
Forum section: electronics / repair

author: JayNi
author_rank: Newbie
timestamp: January 02, 2020, 07:38:32 pm
content: I was fortunate enough to score a very capable Weller DS2000 soldering/desoldering station from the dumpster. It only had one handpiece, the soldering iron. Soldering iron did not work and while looking for replacements(EC1201A) I find that these little suckers are damn expensive (and the desoldering iron 10 times so). Are there soldering pens that could be modified to work with this unit? What makes them so special that they cost over $100 new? Could a WSP80 be made to work with the station? I won’t go into the desoldering handpeace here but feel free to make suggestions. Thanks in advance, you guys are great!www.torontosurplus.com/catalog/product/gallery/id/5044/image/22819/

author: The Soulman
author_rank: Super Contributor
timestamp: January 02, 2020, 10:33:50 pm
content: Nice score,In regards to using a different iron, most weller irons run 24 Volt dc, the problemmay be a different temperature sensors.And obviously the various power ratings.Wsp 80 schematics are somewhere online.

author: z01z
author_rank: Regular Contributor
timestamp: January 08, 2020, 09:45:41 am
content: I think the handpieces are pricey because they have become rare.There's some info about the older Weller productshere. It at least says that the control board is DS1030, though not much info can be found about it. You could however dismantle the unit and reverse engineer the control board, as it is old, it must be simple.As for modifying a newer iron, the controller for WSP80 doesn't used DC drive but switching the AC from the transformer with a triac. It's also a 24V unit.The question remains it the type of temperature sensing element, I have no idea if that's compatible.Are you sure it's the iron and not the controller that's not working?

author: austfox
author_rank: Regular Contributor
timestamp: January 08, 2020, 11:18:12 am
content: It looks like the EC1201A handpiece is a 24V 40W unit that uses the ET series of tips.I'd be inclined to look at the PES51 handpiece (used on WES51 stations) which is a 24V 50W unit that also uses the ET series of tips. I had a look on US eBay and they sell new for around the US$40 mark. Not sure if they are pin compatible or how your DS2000 controller board will handle the temperature sensing, but worth a shot.If you've got a complete EC1201A handpiece that isn't working, perhaps it's just the heating element that has failed, and I believe these cost around the US$30 mark? I assume they fail open-circuit, so easy to test with a DMM.
Weller EC1201A Soldering Iron - intermittent temp sensor - Page 1
Forum section: electronics / repair

author: brian_mk
author_rank: Regular Contributor
timestamp: March 18, 2024, 05:02:02 pm
content: The iron works normally for days or weeks but there seems to be an intermittent fault with the temp sensor.When this happens, the temp indicated on the base unit is all over the place and the iron does not heat properly.When in this state, if I pull the soldering iron plug from the base unit and check the resistance of the temp sensor pins, it measures a few killohms.The measured resistance is not stable but fluctuates. It should be a steady 40 Ohms or so.If I tap the sensor a few times the resistance usually goes back to normal and the iron works again.I am pretty sure it's not the cable or the soldered connections to the sensor.It looks like an intermittent connection inside the sensor itself.They are still available (Part No. EC229A) but are expensive to replace (around £80 or more).I don't know how the sensor works. Does it use a platinum or similar resitance wire?A wire is visible inside a short glass tube (looks rather like a glass fuse). See attached image.Could it be the connection between the wire and the external solder terminals?Does anyone know if they can be repaired?
Weller EC2000 with damaged iron - Page 1
Forum section: electronics / repair

author: prosodyspeaks
author_rank: Newbie
timestamp: May 11, 2021, 01:35:16 am
content: i've had a weller ec2000 for years and it's great, but i tried to change the tip recently and broke the heater trying to get the tip out. i bought an ec234 heater but this doesn't fit the old 1201p handle, or the barrel...i don't know what irons will work with my ec2000 station - can anyone help me?or ideally is there a way to use the pieces i have and just buy a plastic handle and barrel? but which type?!thanks
WELLER PIC firmware dump needed - Page 1
Forum section: electronics / repair

author: yabba235
author_rank: Contributor
timestamp: July 08, 2020, 10:54:27 am
content: Hi !I trying repair old soldering station Weller WD1 but I need fresh fw hex file for it.This is first revision with PIC18F4620 processor.Of course, I do not want it for free - I have to change the hex firmware dumps from models with the 18F6622 processor - WD1 and WD2M and dump fw from WD2 with PIC18F4620 CPU !!I am also looking for the WD1 (M) or WD2 (M) schematic diagram - the second revision pcb with PIC18F6622 processorBTWAll my dumps file is 100% good and working - I tested it myself

author: telsof2014
author_rank: Newbie
timestamp: June 06, 2022, 01:36:34 pm
content: salut please a went firmware wd2 pic 18f4620
Weller PU81 PIC16F1503 firmware dump needed. - Page 1
Forum section: electronics / repair

author: badyl00
author_rank: Contributor
timestamp: February 11, 2020, 12:45:30 pm
content: Hello. I have weller PU81 station with burned microcontroller. There is PIC16F1503. Maybe someone can read firmware from it. Also need value or marking of ic and diode marked in attachment. I desolder it some time ago and it's gone now.

author: mariush
author_rank: Super Contributor
timestamp: February 11, 2020, 12:52:24 pm
content: The chip's firmware is most likely protected, meaning you can't read it.If you're really lucky, maybe you can contact Weller and ask them to send you one pre-programmed chip, or a whole replacement board (that may cost you some money)As for your other questions, this seems to be the service manual which includes schematics :https://elektrotanya.com/weller_pu81_schematic.pdf/download.html

author: badyl00
author_rank: Contributor
timestamp: February 11, 2020, 01:01:48 pm
content: Quote from: mariush on February 11, 2020, 12:52:24 pmProbably weller do not protect their chips. Schematic from link is a old hardware version. Newer its on uC. I tried to contact weller but they don't want to help.I attach a photo with pinout for programming.Maybe someone have this version of station and can read firmware and fusebits.

author: badyl00
author_rank: Contributor
timestamp: February 18, 2020, 12:25:56 pm
content: I drew a schematic of this scrap. I'm not sure about U2. It have marking SAGK and SOT-23-5 package.

author: badyl00
author_rank: Contributor
timestamp: February 18, 2020, 02:43:23 pm
content: Searched a lot of datasheets and probably it is a MCP601 in SOT-23-5 package:http://ww1.microchip.com/downloads/en/devicedoc/21314g.pdfSchematic updated.

author: badyl00
author_rank: Contributor
timestamp: February 27, 2020, 08:32:08 am
content: In attachment firmware readed from another station. After replace 100% working. Program with MPLAB. Op amp is MCP601 and zener diode 8,2V.

author: rovannon
author_rank: Newbie
timestamp: March 01, 2020, 03:13:48 am
content: Aliexpress has the pud81 boards for 30 euros.https://www.aliexpress.com/item/4000466129544.html?spm=a2g0o.productlist.0.0.6bee3a81IiJAtq&algo_pvid=d35a6759-11d9-445e-a250-e0c763b21a8d&algo_expid=d35a6759-11d9-445e-a250-e0c763b21a8d-17&btsid=0b0a187915830324013132286e2997&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_

author: badyl00
author_rank: Contributor
timestamp: March 02, 2020, 07:58:24 am
content: Quote from: rovannon on March 01, 2020, 03:13:48 amThis board have LED display. In these case I must change front panel. So this post is useless.
Weller soldering station  - Page 1
Forum section: electronics / repair

author: Bullone
author_rank: Newbie
timestamp: May 13, 2019, 08:34:08 am
content: Hi guys,I have an old Weller soldering station WTCP-S and 2 Weller soldering irons: one of the soldering iron has 3 wires (with connector) and the other one just 2 (witho no connector), how does that soldering station works?I've tried to conenct the 3 wires iron to the station that has 3 pin connector and it seems to works correctly (I can hear some "clicks"...) but after 10/15min the soldering iron stop to get hot.I've also tried connecting the 2 wires soldering iron to the central pin and left pin of the station connector and it seems to work fine (I can hear some "low clicks"...).Can I consider the soldering station is working fine and the 3 wires iron is not working well?How can I repair the 3 wires soldering iron?Is it safe to just buy a Weller 3 pins connector (do you know the code or where to buy?) and use the 2 wires soldering iron with the station?How can I use that 2 wires soldering iron without the soldering station?Thanks and sorry is I wrote stupit questions

author: mikerj
author_rank: Super Contributor
timestamp: May 13, 2019, 11:42:22 am
content: The old WTCP soldering irons use a magnetically operated switch within the iron to control temperature. The Curie point of the soldering tip sets the regulated temperature.These are mostly very reliable, but the switch contacts can become burnt which causes the problems you are seeing. The first thing I would do is take the iron handle apart and clean the contacts. The difference between the two/three wire parts is probably just grounding.I have one of these irons that is at least 25 years old and I still use it regularly.

author: Bullone
author_rank: Newbie
timestamp: May 13, 2019, 12:39:02 pm
content: Thanks for response!I'll take some pics and let you know...
Weller VP800 desoldering station foot-switch pinout please - Page 1
Forum section: electronics / repair

author: klim
author_rank: Newbie
timestamp: April 20, 2020, 05:29:20 pm
content: Hi, someone has a circuit diagram for the Weller VP800 desoldering station, in special in need the pinout for the foot-switch to start the pump. The foot-switch on my station was missing at time of purchase, so i wanted to make my own. I allready have the correct connector (DIN 6pol.) and replacement foot-switch , now i just need the pinout to complete. So in need help from an owner of such a device. Many thanks in advance.
Weller WD2M  Firmware file(s)? - Page 1
Forum section: electronics / repair

author: mkinn
author_rank: Contributor
timestamp: June 29, 2025, 04:04:16 am
content: I can NOT find ANY mention of this station's FW update files ANYWHERE on the internet! It CANNOT be the same as the WD1 or WD1H. I have the Firmware Updater 3.2.exe and WD Monitor Ver 3.6 program that allows monitoring and logging the temps, etc., with ALL the other National Instruments support software that got installed with it from the 3.6 install package. I downloaded that from the Weller FW update website, along with the current FW for the WR3M. It updated all the previous Ver 3.2 software that came on the CD for my WR3M. None of it has any way of viewing the current version, loading the existing FW, or saving a copy before I try upgrading it. Is there better FW upgrading software available? is there another way to interrogate the station from the command line using the com port(s)? What would it add or DO that I might need for proper use, new features, beneficial changes for reliability, etc? ANY help would be appreciated.
Weller WECP-20 repair - Page 1
Forum section: electronics / repair

author: Refrigerator
author_rank: Super Contributor
timestamp: August 05, 2016, 09:02:40 pm
content: I got my weller from a flea market for 10 bucks and i don't feel like buying a new hand-piece, the thermistor and heating element both died today.I know that both Weller and Hakko use thermistors, i would like to keep the station but replace the hand-piece with a hakko one.Would appreciate if someone could poke their Weller thermistor with an ohm meter, Hakko ones are about 50 ohms at room temp.Thanks.

author: Andy Watson
author_rank: Super Contributor
timestamp: August 05, 2016, 09:28:32 pm
content: About 22\$\Omega\$ according to the service manual.http://remotesmart.wikidot.com/weller-wecp-20

author: Refrigerator
author_rank: Super Contributor
timestamp: August 06, 2016, 08:49:56 am
content: Thanks.Seems like i'll need to do some mods to fit the Hakko iron to the weller station.Weller thermistor gains about 7.73 ohms per 100oC, while Hakko one gains about 20ohms per 100oC.Should not be too difficult to mod, as long as i can get it to maintain 300oC i'll be happy.

author: w9gb
author_rank: Contributor
timestamp: September 20, 2024, 06:25:40 pm
content: Weller WECP20 Service Manual (Germany), attached below.The Weller EC-series (1977-2003) used Type-K thermocouples.The EC-1201(North America) and LR-21 (Europe) iron was discontinued around 2020.gb

author: inse
author_rank: Super Contributor
timestamp: September 20, 2024, 06:52:09 pm
content: This service manual says 32.7Ohms at 150C and 53.7Ohms at 450C, so you are going to need a parallel resistor.Maybe there is a chance to adjust for a usable temperature scale with the two trimmers.

author: Refrigerator
author_rank: Super Contributor
timestamp: October 03, 2024, 06:10:03 am
content: This thread has been dead for 8 years and i've since switched to T12 tips and stations.But the user manual might help other people who are looking into repairing their soldering station.
Weller WHA-300 repair - Page 1
Forum section: electronics / repair

author: pienari
author_rank: Regular Contributor
timestamp: October 07, 2024, 09:28:33 pm
content: I have looked schematics for the WHA-300 but not found.Heater works.Fan is dead.I tested fan motor with external ac psu and it works fine.Anyone have this hot air station?

author: pienari
author_rank: Regular Contributor
timestamp: October 08, 2024, 01:54:38 pm
content: I have tested all diodes and transistors ok.I replaced all ic.2pcs thyristors are ok.To do list.SMD resistor values ??SMD capacitors ??

author: Andy Watson
author_rank: Super Contributor
timestamp: October 08, 2024, 05:55:28 pm
content: Quote from: pienari on October 08, 2024, 01:54:38 pmWhat types of chip? Are any of them microcontrollers?

author: Bryn
author_rank: Regular Contributor
timestamp: October 08, 2024, 06:02:49 pm
content: Regarding the capacitors, make sure they're not damaged.Have you checked the power supply of the fan also? That could be an issue also, if it's not receiving much power from it.

author: pienari
author_rank: Regular Contributor
timestamp: October 08, 2024, 07:12:19 pm
content: I have to get board powered and make some measurements.There is no microcontrollers.Fuses are ok.Optocouplers i need to remove from board and test.

author: pienari
author_rank: Regular Contributor
timestamp: October 08, 2024, 07:13:36 pm
content: 1 more

author: pienari
author_rank: Regular Contributor
timestamp: October 10, 2024, 12:27:52 pm
content: Both optocouplers are good.

author: pienari
author_rank: Regular Contributor
timestamp: October 13, 2024, 01:29:57 pm
content: I manage to get it partially workking now.Now power on fan spins all time really slow ,When button is pushed fan spins faster ,rpm can be adjusted, led blinks and heater temp adjust works fine.Needs more inspection.

author: Sivanov
author_rank: Newbie
timestamp: July 09, 2025, 04:18:35 am
content: Hi, I was looking for a heating element for this device and saw your topic. I am attaching a diagram, I hope it is not too late.Regards.
Weller WMD 1S Repair. - Page 1
Forum section: electronics / repair

author: Gangway
author_rank: Contributor
timestamp: May 29, 2025, 03:19:07 am
content: Greetings, just asking if anyone has circuit diagram for above unit.Have been asked to try & repair non working unit.Rusted screws on case had to be ground off, Main PCB has two rusted/seized screws , which is giving me grief.24VAC secondary volts ok & 29VDC on bridge, but until I can remove PCB, will need to decide if worth continuing without DWG.
Weller WMD3 issue - Page 1
Forum section: electronics / repair

author: Alban LG
author_rank: Newbie
timestamp: March 28, 2023, 07:09:41 am
content: Hello everyone,I just bought a used Weller WMD 3 and just received it.The irons get hot, the vacuum is a bit capricious and the AIR doesn't work at all. So I have this faulty AIR/VACUUM pump.The second problem is that the UP and DOWN keys doesn't work. I tried a RESET by pressing the TIMER and "1,2,3" buttons, the screen displays "000" but the factory settings are not restored.I wondered if I have dead switch but they work when I hold down the "1,2,3" button while scrolling through the channels.I'm thinking an EEPROM problem...What else can I check?

author: m k
author_rank: Super Contributor
timestamp: April 01, 2023, 04:20:51 pm
content: Can you check the pump with external power?
Weller WR3M footswitch and adapter, has Anyone used one? - Page 1
Forum section: electronics / repair

author: mkinn
author_rank: Contributor
timestamp: June 23, 2025, 03:19:21 pm
content: I just bought 2 WR3M rework stations, and would like to hook up a T0051312099N footswitch, especially for the WVP pickup pen. The Hot Air pen and De-soldering irons have a switch in the handle, so not really a need for a footswitch there, but I'd like to know if that was also possible, maybe for special needs cases. I keep my stations under the bench on a shelf to free up space on the bench top. The only way to use the WVP pickup pen is to press the Air button on front, a little harder to do now.There is an adapter, T0058738850 listed in the manual and catalog, which is necessary to use the footswitch with this station, but I cannot find one ANYWHERE! Maybe with an RJ11 plug on the footswitch end of a cable, and there must be a USB-mini B plug on the other end for the rear jack on the WR3M. That seems to be what the WX series uses for a footswitch. Can this work without a powered PCB with logic IC's? I have the Weller software that comes with the station, it works, and it can do FW updates and can log the temp's for mfg/quality control.If anyone HAS seen this footswitch/adapter combo, is there a photo, website, or ANY other mention of it on the web? I cannot seem to find one, and Weller replied recommending I purchase a new WX station, no help at all. Since there are NO schematics or theory of operation manuals ANYWHERE, I'm left in the dark. Hoping someone here can help soon, before there's nobody left who still has ANY knowledge about these incredible older stations. I'd be happy to make an adapter if i had the proper info...55+ years as a bench tech, just now able to afford some of these $$$ items!!!
Weller WRS-1002 Rework Station Repair - Page 1
Forum section: electronics / repair

author: ibm portable pc
author_rank: Newbie
timestamp: September 01, 2024, 07:02:35 am
content: I purchased one if these on ebay, for what looked like a good price, however, there is not enough suction to desolder anything.I then tried to increase the air volume via the instructions from the manual:“Air-settingBy permanently pressing the „Air“ button (the display switches to air-volume. The air throughput can then be altered gradually from 1 l/min-10 l/min by pressing the „Up“ or „Down“ buttons (4) (7). If the buttons are continuously pressed, the adjustment is fast.”https://www.manualslib.com/products/Weller-Wrs-1002-6896852.htmlThis did not help. So assuming the pump itself is not faulty, the control circuitry is. My problem is that I have not been in the electronics space for about 40 years and my knowledge is rusty, to say the least.I opened the unit up and determined that the pump appears to be controlled via one of two triacs, T2 or T3 as shown on page 18 of the manual. Having said that, I have only conducted a quick visual inspection. I next plan to:1. Determine which triac is connected to the pump.2. Measure voltages on all triac pins as I adjust the front panel air volume controls.3. Replace the triac if only output to pump does not vary.4. Trace circuit back from triac if no voltages around triac vary.All suggestions are welcoming, including links to a schematic, which I have been unable to locate.

author: Timoteo
author_rank: Newbie
timestamp: September 04, 2024, 09:24:04 am
content: Hello ibm,How is going the troubleshooting?Did you try those simple steps as clean the gun, pipes, filters and the pump itself?A lot of the times the problem is just mechanical.good luckTimóteo
Weller WTHA1 serial port - Page 1
Forum section: electronics / repair

author: JACOPO99
author_rank: Newbie
timestamp: August 26, 2022, 10:41:08 am
content: Hi All,I just laid my hands on a Weller WTHA 1, and it seems to have a serial port on the bottom of the unit.Does anyone know what's for? Both manuals won't say, with one just pointing towww.weller-tools.com.I tried to look on the website but there's nothing interesting. The software updates section doesn't have anything for this station.They won't even provide the part number for the required cable.Thanks.
Weller WXMT tweezer tips cross legged  - Page 1
Forum section: electronics / repair

author: 4cx10000
author_rank: Regular Contributor
timestamp: March 10, 2021, 10:51:23 pm
content: Hi!I recently bought the Weller RTW 6NW 45° tweezers but surprisingly the tips where cross legged and I do not want to take the risk to bend these in order to align them. What would you do? I also noticed that the tips of the other tweezers I have is also slightly cross legged.Anyone experienced this?

author: 4cx10000
author_rank: Regular Contributor
timestamp: March 11, 2021, 01:19:40 pm
content: Sorry ... should have attached pictures in my first post! Well, here they are and believe me that I do not use force when the tips passes one another.
Wells Gardner 19k7000 arcade monitor chassis; need help. - Page 1
Forum section: electronics / repair

author: DC Jack
author_rank: Contributor
timestamp: August 29, 2025, 08:39:52 pm
content: I am working on a Wells Gardner arcade monitor chassis, K7000, marked with a P447 which, form what I have gleaned from the Internet, mean is it intended for use with 19 inch tubes. I am trying to Frankenstein a cabinet together from parts that a local arcade was dumping because they were "modernizing". I am having width issues I just can't seem to solve and I'm hoping someone here knows their way around this board and can give me some pointers. Here's my story so far.This board was attached to a tube that was necked. It was also a board that looked most promising. The voltage regulator and the horizontal transistor were shorted. The flyback had a crack. Some of the adjustment pots were cracked. I downloaded the service manual and bought all of the replacement parts and also made a cap kit while I was at it. I installed them all and checked all of the traces. Repaired a lot of broken traces and ring cracks. "First test: I plugged it into a TV that I salvaged and crossed my fingers that the flyback did not arc. I didn't! YES! but it would not focus. So I ordered and replaced it with one form Arcade Parts and Repair.Second test: It lives! Focus works. Brightness works! I buy the CraftyMech Test Pattern Generator to test screens so that I can choose the best looking one.The TPG arrives and I start playing with monitors. I go through three of them and they all have width problems. I guess I just have bad luck. I find a fourth 19 inch tube on Facebook. Strip it down and plug it in. Same problem. Can't get the raster to the edges, much less to over scan. This can't just be four incompatible tubes in a row with the exact same problem.I start to dive deep into the k7000 schematics and find that the 25" k7000 has a cap that is parallel to D18. This cap does not exist in the 19 inch schematics but it does look like it was installed as a modification in other 19 inch boards that I've seen pictures on when Google'ing. I try a few different values and find that 0.0020uF gives me the best increase in width with the least amount of distortion. It helps, a lot, but does not solve the problem. There is still half and inch of gap between the edge of the screen and the limit of the raster.I made a gallery of pictures with and without the cap installed parallel to D18.https://imgur.com/a/ewcyQtUI have gone though the entire width circuit from the pins that connect to the yoke, all the way back to IC2, and tested every component out of circuit. Everything tests as expected. Caps are capacitating, diodes are dioding, resistors are resistoring, and transistors are transistoring.I did find something interesting and don't know if this is normal or not, but when I turn off the TPG with the chassis still on the raster expands dramatically. When I turn the TPG back on the picture takes a moment to sync and the raster shrinks back down to being much too small.Here's a video.https://youtu.be/SMB6NSYDrHkI'd appreciate any advice because I'm stuck at this point. Thanks for reading.
WEP 853D Rework Station low temp - Page 1
Forum section: electronics / repair

author: ajp8868
author_rank: Regular Contributor
timestamp: July 03, 2020, 07:30:33 pm
content: Hi all,After trying to fix an Xbox I've realised that my rework station is not getting to the temperatures displayed on the screen. It seems to think it's getting to 480 degrees C, but an infrared thermometer reads about 120-130. I've had a look inside and nothing is obviously blown or open/short circuit.. what should I be looking to check first? Does anybody have one I could compare the thermister ohm readings with?Cheers,Adam

author: wraper
author_rank: Unknown
timestamp: July 03, 2020, 07:43:08 pm
content: First learn how the infrared thermometer works and how to use it properly. And nope, you cannot measure an air temperature with it. Also it will not work properly on most of glossy surfaces, especially metals.

author: ajp8868
author_rank: Regular Contributor
timestamp: July 03, 2020, 07:49:58 pm
content: Ohmaybe it is working then! What can I use to measure the temperature of the air gun?

author: wraper
author_rank: Unknown
timestamp: July 03, 2020, 07:59:57 pm
content: Quote from: ajp8868 on July 03, 2020, 07:49:58 pmYou need a thin unsheathed thermocouple with it's end slightly inserted into a nozzle and not touching it's walls. Also airflow rate should be set to a higher end to mitigate measurement imperfections.Something like this:

author: wraper
author_rank: Unknown
timestamp: July 03, 2020, 08:03:58 pm
content: BTW I don't suggest setting temperature above 400oC on such Chinese stations. Heater is prone to fail within minutes of operation when you set maximum temperature.

author: ajp8868
author_rank: Regular Contributor
timestamp: July 03, 2020, 10:33:27 pm
content: Ah that's great, thanks wraper
Rework Station overheating iron - Page 1
Forum section: electronics / repair

author: ajp8868
author_rank: Regular Contributor
timestamp: July 06, 2020, 03:37:51 pm
content: Hi All,I bought this 853D in a broken state and one of the issues was the soldering iron, I thought it would likely be the thermistor as it just continues to heat up but reported a low temperature. I've replaced the ceramic with the correct one (as stated on WEP's site) but it's still reporting low temps which don't change until I take the iron out and plug it back in (but still low).I have done some investigation and it's using an LM358 to detect the voltage difference and that then reports to the pin circled on the main chip.As this board uses a few LM58s to detect the temps I tried swapping one round but it's the same, my next step is capacitors but the two smd capacitors tested ok.Am I looking in the right place? Does anybody have one of these that could get some reference voltages?Thanks!

author: ajp8868
author_rank: Regular Contributor
timestamp: July 07, 2020, 08:14:11 am
content: Just an update on this, there seems to be no voltage reading on the the thermistor input or output when the iron is plugged in but it has 3.5v when it's not plugged in. I would have thought until the thermistor heats up and actually starts resisting more, the voltage would be relatively similar?Can anyone help?

author: Rasz
author_rank: Super Contributor
timestamp: July 08, 2020, 05:04:28 am
content: voltage drop all the way to zero sounds like you are connecting thermocouple = dead short

author: ajp8868
author_rank: Regular Contributor
timestamp: July 08, 2020, 08:28:54 am
content: Ah thank you, that would make a lot of sense. The element I bought was an a1322, and the sensor pins test at 1.2ohms.Would the a1321 be suitable? From what I've read these seem to contain a thermistor instead.
Wep852d+ - Page 1
Forum section: electronics / repair

author: TheSpecialist
author_rank: Newbie
timestamp: March 09, 2020, 02:17:45 pm
content: Hi folks,I'm not much of a contributor on here at the present, in fact, I think this might be my first post?!Anyway, I've done a search on the forum first, but nothing relevant to my enquiry pops up.I've got one of those China made solder workstations, soldering iron and hot air gun, which I know one or two of you on here have.My question though is, of those who have modded or repaired these and all their variants, does anyone know what type of wire/cable is used for the air gun?All I know is it's 8-core(?) black cable, but does anyone know what might be suitable to replace it with?Not expecting much of a response, but anything I get, I'm grateful for!Thanks!

author: joystik
author_rank: Contributor
timestamp: March 09, 2020, 02:52:28 pm
content: I have never bought it but you could start your search with this: hxxps://www.aliexpress.com/i/32798844462.html"8 core 13 awg cable"Hope it helps.
WFCO WF-9875-AD converter charger resistor identification help - Page 1
Forum section: electronics / repair

author: jeffrond
author_rank: Contributor
timestamp: September 16, 2025, 08:59:26 pm
content: I have a WFCO WF-9875-AD 75 amp converter charger that had some issues.I replaced a bad mosfet and then noticed a few nearby components that were burned when the mosfet blew.I can identify the 102 1kv and the 102 2kv capacitors from the writing on them. However...There are two resistors that are badly burned. R4 and R11.In the image the top one looks like Brown-Black-Mystery-Burnt Gold. It measures 1meg ohm.In the image the bottom one looks like Brown-Black?-Mystery-Guessing Gold. It measures 11k ohm.I am assuming they should both be the same value since each one is feeding one of the two mosfets. I could be totally wrong here. Do you suppose they would both be 1meg ohm?Thanks,Jeff

author: fenugrec
author_rank: Frequent Contributor
timestamp: September 23, 2025, 12:33:16 am
content: Suggest tracing part of the mosfet drive circuit. Those resistors are likely either source-to-gate, or in series with gate; 1M could make sense for the former, but not the latter.If in series, 10R or 100R would be a closer ballpark IMO.As a last resort, you could remove other known (good) resistors from that same pcb, sand them down and compare internal construction for a given value. But, I'm not sure how much visual difference there would be between say 10R and 100R.

author: jeffrond
author_rank: Contributor
timestamp: October 04, 2025, 04:12:14 pm
content: It took me a while to get back to this project. But I finally have.It looks like the resistors are source to gate on a Vishay SiHG30N60E MOSFET.https://www.vishay.com/docs/91455/sihg30n60e.pdfDo you think a 1M would be a good try for these.
What are the brightness levels of a series light bulb with a CRT television?  - Page 1
Forum section: electronics / repair

author: Dhanushka
author_rank: Regular Contributor
timestamp: October 17, 2019, 03:54:50 am
content: Dear all,I am new to repair CRT TVs. Can I know about the brightness levels of a series light bulb with CRT TVs. What is says at following states? I hope to use 75W light bulb.1. At startup the CRT TV2. Running normally3. Shorted componentThanks.

author: Simon
author_rank: Unknown
timestamp: October 17, 2019, 06:35:12 am
content: Please do not double post.
What are the brightness levels of a series light bulb with CRT TVs? - Page 1
Forum section: electronics / repair

author: Dhanushka
author_rank: Regular Contributor
timestamp: October 17, 2019, 03:56:19 am
content: Dear all,Can I know about the brightness levels(High, Low , Medium) of a series light bulb with CRT TV for following states? I hope to use 75W light bulb.1. At startup of a good CRT TV2. Running normally of a good CRT TV3. Shorted component of a bad CRT TVThanks.

author: Dhanushka
author_rank: Regular Contributor
timestamp: October 18, 2019, 08:52:07 am
content: Is there a anyone know about this?

author: capt bullshot
author_rank: Super Contributor
timestamp: October 18, 2019, 10:34:29 am
content: That's not the way it works.For a working and good TV, the bulb shall now light up at all, maybe a short flash when it's turned on. If the bulb lights up, the TV may not work correctly and you should use a higher wattage bulb.The bulb will light up more or less brightly if there are defective (shorted) components at the power suppy circuitry. Often used to find bad capacitors in old tube equipment or stuff with line frequency transformer power supply. Doesn't work too well with modern stuff with SMPS, will only indicate short circuits at the input side of the power supply, and maybe prevent the SMPS from starting at all though it is perfectly good.

author: tszaboo
author_rank: Super Contributor
timestamp: October 18, 2019, 11:53:46 am
content: Sorry, we dont have CRT TVs anymore, nor incandescent light bulbs.
What are these connectors called? - Page 1
Forum section: electronics / repair

author: klausman
author_rank: Regular Contributor
timestamp: March 08, 2025, 02:15:13 pm
content: This is the connector that hooks the front-panel power switch to the power supply board. The wiring is AWG22. the width of the box-shaped metal bit is ~3mm

author: squadchannel
author_rank: Frequent Contributor
timestamp: March 08, 2025, 02:19:24 pm
content: JST VH

author: klausman
author_rank: Regular Contributor
timestamp: March 08, 2025, 06:43:30 pm
content: Quote from: squadchannel on March 08, 2025, 02:19:24 pmYou're a lifesaver, thank you!
What are these connectors - maybe bullet connector? - Page 1
Forum section: electronics / repair

author: 1980s_john
author_rank: Contributor
timestamp: September 11, 2025, 07:47:11 pm
content: Hi,I am looking to connect to a PCB (Apple II PSU) which has two male studs / pins fitted as shown in the attached. The PSU uses a grey plug as shown, but I can't find this part. The closest I could find is a bare metal bullet connector (as attached).The pins are 2.4mm diameter, not sure of height, somewhere around 8mm. Please advise what type of connector was used for the female plug, so I can try and find a suitable part, or maybe the bullet connector is the best option.Thanks,John

author: factory
author_rank: Super Contributor
timestamp: September 11, 2025, 08:42:10 pm
content: Are you sure it's 2.4mm and not 2.36mm (.093")?David

author: 1980s_john
author_rank: Contributor
timestamp: September 11, 2025, 09:11:48 pm
content: OK, sorry I didn't specify my measurement accuracy, the pins are 2.4mm +/- 0.1mm

author: factory
author_rank: Super Contributor
timestamp: September 11, 2025, 09:23:51 pm
content: The 2.36mm/0.093" are a standard size for various Molex, Amphenol & other brands of pin/socket, not sure they made the one in question, possibly a clone as I've seen the same plastic housing in a Dell CRT.David

author: 1980s_john
author_rank: Contributor
timestamp: September 11, 2025, 09:53:58 pm
content: Many thanks David, this information is exactly what I was looking for - Molex pin and socket connector .093 inch.Regards,John
What are you using for SMD tweezer probes?  - Page 1
Forum section: electronics / repair

author: Johnny10
author_rank: Frequent Contributor
timestamp: July 09, 2019, 05:10:47 pm
content: What are you using for SMD tweezer probes?I am having trouble measuring these little buggers with my DMM and especially the Sencore LC-102.I need long leads and single hand probe.

author: bob91343
author_rank: Super Contributor
timestamp: July 09, 2019, 05:50:23 pm
content: The Chinese have a cute probe for not much money. I looked it over and decided to pass, but it might suffice for your needs. I want something that supports 4-wire Ohms.I bought some 'Kelvin clips' from China and they work but are a bit poor regarding holding on to things. I modified them with a drop of solder and it helps only a little. You could use those well enough if you are willing to hold them in place. Come to think of it, I have a spare one so maybe I could use that for SMD parts.It's good enough for casual measurements but if you want capacitance or inductance it's not what you want. In those cases, a shielded bridge is an answer. Certainly checking for bad semiconductors is well within its ability.Just go on ebay and ask for test leads or test clips.

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2019, 03:25:33 am
content: Quote from: Johnny10 on July 09, 2019, 05:10:47 pmIf you're gunna do lots or get right into SMD then get some proper SMD Smart tweezers.You can spend $100's but for entry level ones the Mastec ones are just OK.https://www.amazon.com/Mastech-MS8910-Resistance-Capacitance-tester/dp/B00F3RQCFWLCR Research or Smart Tweezer ST5-S are the decent tools for SMD.I've an old ST3 set that I use instead of a DMM for everything but voltage and current measurements, TH or SMD. If it busted tomorrow I'd replace it in an instant with a more modern version.

author: PKTKS
author_rank: Super Contributor
timestamp: July 10, 2019, 10:56:35 am
content: Long leads are a problem hard to solvePrice is not worthy for regular bench or hobby gearANENG was selling such affordable probes...but quality is really below the line...The cable used to achieve price and length is .. well (unprintable)So I ditch the crappy cable and replaced that with a normalregular DMM CAT cable line.The inner of the tweezers are plastic.. a bit of tinkeringa clever joint and an extra heat shrink tubing...RESULT IS GOOD. Hardly you will find such thing at that price..thanks to extra isolation and damn good cable and jointsimpedance for measuring RLC is acceptable... made enough testsPaul