hybridfree/eevblog-posts huggingface dataset:
Calibrating my Tek 2445 - Page 1
Forum section: electronics / repair

author: bob91343
author_rank: Super Contributor
timestamp: July 19, 2019, 09:48:31 pm
content: I acquired one of these and see that it's not very accurate, both in time and amplitude. I fully expected an old time calibration procedure where one adjusts gain and so on but apparently they decided to modernize and make it self calibrating, sort of.Can someone advise me how to accomplish this without risk? Reading the procedure only confuses me at this point.

author: tautech
author_rank: Super Contributor
timestamp: July 20, 2019, 10:19:35 am
content: Manual link:http://w140.com/tekwiki/images/5/5b/070-3829-00.pdfPart 4 lists the gear required and part 5 has the procedures.They are closely related to the 2465B family of which there is a big thread about them that should offer some guidance.General consensus is the Service Manual is to be followed explicitly and the posts by member rf-loop offer his experiences of working on many in reply #14:https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/msg73972/#msg73972Maybe you could jump into that thread and seek help from others with this scope.

author: rf+tech
author_rank: Frequent Contributor
timestamp: July 20, 2019, 03:21:09 pm
content: Hi bob91343,Before anything, check the +10 Volt reference. Nearly all front panel potentiometers are supplied from this +10 Volt reference. The outputs of these pots are inputs to ADCs.When the reference is off, so too will be accuracy and attenuator balance - the latter causing vertical trace shift when changing vertical Volt/division and variable vertical gain.R1292 on A2 is to be set within 9.99 and 10.01 Vdc. Closely observe the voltage at A2 TP201 for any sign of drift. Nudge R1292 ever so slightly and again note any tendency for drift. I’ve now replaced noisy R1292 on three 24x5 scopes. This Bourns 1 kOhm pot has the proper lead spacing and orientation:https://www.digikey.com/products/en?keywords=3386S-1-102LFIt should go without saying that all power supply voltages and ripple should be checked, per Table 5.1, section 5 page 2 of the manual.Regards,RF+ Tech

author: bob91343
author_rank: Super Contributor
timestamp: July 20, 2019, 07:49:00 pm
content: Thanks for the replies. When I get the nerve and enough time I will get into it. The unit works well for the most part but is inaccurate. The intensity setup seems to need some attention as well.Power supply first, including reference.
CALIBRATOR RS - Page 1
Forum section: electronics / repair

author: lionelkjh
author_rank: Frequent Contributor
timestamp: December 17, 2021, 06:05:20 pm
content: Good evening everyone! I bought an RS calibrator (quite old), but relatively functional ..... On the other hand, the generated tensions are a little far from reality. My question is the following: does someone have the technical documentation to redo a complete calibration, (when I opened it I noticed that a large number of potentiometers were present, but I do not know what the ranges are? to be settled respectively) .... Thanks to all who can help me !! I am attaching the photos to you ....

author: tggzzz
author_rank: Super Contributor
timestamp: December 20, 2021, 08:03:45 pm
content: The full answer ishere
calibrator Yokogawa 2564 - Page 1
Forum section: electronics / repair

author: rmserroni
author_rank: Newbie
timestamp: March 23, 2020, 02:42:16 pm
content: Good morning I have a Yokogawa 2560 calibrator and I'm having problems with the current module 2564, I ask for help to anyone who can provide the service manual for this model in specific Yokogawa 2564, thanking everyone in advance.

author: rvalente
author_rank: Frequent Contributor
timestamp: March 23, 2020, 03:23:30 pm
content: Have you tried contacting Yokogawa? Do they service this unit?

author: rmserroni
author_rank: Newbie
timestamp: March 23, 2020, 06:07:22 pm
content: Aqui no Brasil não tem mais suporte para este equipamento a documentação foi descartada.

author: rvalente
author_rank: Frequent Contributor
timestamp: March 23, 2020, 07:57:47 pm
content: Have you tried contact yokogawa japan or us?I see you may have problems with english, if you pm me, I can give my contact details to ask this information for youCheck this post:https://www.eevblog.com/forum/metrology/yokogawa-2553-voltage-dc-calibrator-109672/

author: rmserroni
author_rank: Newbie
timestamp: March 24, 2020, 12:15:55 am
content: I already know this link it was through him that I met EEVBlogIn Japan I sent a message today I am waiting for the answer.I need the model Yokogawa 2564 because it is not generating current, there is some failure in the closing of the selector or the control part, power tested and it works.

author: rvalente
author_rank: Frequent Contributor
timestamp: March 24, 2020, 01:16:28 am
content: I'm trying to reach some nostalgic local guys here, they may have this manual, I'll seek and report.

author: Simon
author_rank: Unknown
timestamp: March 27, 2020, 07:31:00 am
content: please only post in English.
California Instruments AC Load 3091LD - 222 Error   - Page 1
Forum section: electronics / repair

author: henry2212
author_rank: Newbie
timestamp: July 16, 2021, 04:50:13 pm
content: Hi,I have an issue while testing the California Instruments 3091LD. It pops the 222 error message and not allow to input info to test. Its message is "Parameter data send with command is out of range."According to manual solution, 222 errors are "Check mode or range settings."what are the corrects to setting. I do not have Lab View to test. I do it manually.Thank you,
Call for Help Smart-UPS SC 1500 is out of order - Page 1
Forum section: electronics / repair

author: Abu Haider Aliraqi
author_rank: Newbie
timestamp: February 06, 2023, 10:52:16 am
content: Hello, I have a Smart-UPS SC 1500 that is malfunctioning. It does not run on electricity only on batteries. I am from Iraq and I translate from Google. I don't know only the Arabic language. I will attach pictures showing the malfunction that occurred. It is shown in the picture. It has exploded, and I do not know if it is expanding or otherwise
Call the Fire Truck - 9VAC-2.1A Power supply supply help - Page 1
Forum section: electronics / repair

author: sampler1
author_rank: Regular Contributor
timestamp: January 11, 2023, 07:41:51 pm
content: Hi all, happy New Year.I picked up a lexicon I-onix U42S audio interface. As you can see in the photo ,we had a little fire. Also someone has been in here. on each side of the ground point some solder points have been added. I guess in a repair attempt. i looked for a schematic but nothing to be found and I need to figure out the voltage path. It would be appreciated if someone could help me out. The supply Voltage is 9VAC at 2.1A. I see there was some type of fuse F1 an inductor L1 and I guess C2. If someone could mark up my photo that would be a great help and also let me know what you would suggest for a fuse. I can measure the caps and inductor. I'm just not sure of the voltage path.Best regards !

author: Audiorepair
author_rank: Frequent Contributor
timestamp: January 11, 2023, 07:59:39 pm
content: https://www.google.com/url?sa=i&url=https%3A%2F%2Flastminuteengineers.com%2Fthe-full-wave-bridge-rectifier%2F&psig=AOvVaw02W2E_JOJgWaqEMGG-OpRK&ust=1673553468182000&source=images&cd=vfe&ved=0CBAQ3YkBahcKEwiQvs_RpsD8AhUAAAAAHQAAAAAQCA

author: sampler1
author_rank: Regular Contributor
timestamp: January 11, 2023, 08:48:36 pm
content: maybe I should clarify; I have no problem understanding a rectified power supply. Im trying to figure out the Voltage routing from the jack to the bridge. the inductors and caps are throwing me off.Thanks

author: elecdonia
author_rank: Frequent Contributor
timestamp: January 12, 2023, 09:10:42 pm
content: Kinda looks like somebody applied mains voltage to it!

author: Nusa
author_rank: Super Contributor
timestamp: January 12, 2023, 11:30:59 pm
content: Maybe not mains, but it's quite possible someone used the wrong voltage wall-wart.If it was me, I'd do the math for the rectifier output and supply the right voltage DC to the smoothing cap to see if the rest of the beast still works. No point in going further if something major is gone.As for your burned bit of circuit, the burned side probably looked very similar to the unburned side, with the inductors being used for filtering purposes.
Calling ADMIN - Page 1
Forum section: electronics / repair

author: EddyInChicago
author_rank: Contributor
timestamp: November 09, 2020, 12:14:23 am
content: Hello,I'm not able to attach photos to my posts. Please help.Thanks,Ed

author: EEVblog
author_rank: Unknown
timestamp: November 09, 2020, 12:29:02 am
content: There is a current issue with large images and other attachments. Try resizing to a smaller file size, or use an external image host like imgur

author: CatalinaWOW
author_rank: Super Contributor
timestamp: November 09, 2020, 01:06:42 am
content: I had a similar problem, and resolved it by putting the photos in a .pdf and posting that.

author: EddyInChicago
author_rank: Contributor
timestamp: November 09, 2020, 03:36:00 am
content: Thank you. CatalinaWOW - I did exactly that and it worked.
Calling all ELMERS HELP me please - Page 1
Forum section: electronics / repair

author: Crambone
author_rank: Frequent Contributor
timestamp: November 14, 2019, 01:36:53 am
content: I have a ARF2001 Scanning Transceiver that is giving me issues.I checked voltage as listed on 3.6.2 in the service manual and all Line No. (test points) Pin 10's on all boards and all are without the 13.5Vdc in AM Position, when in LSB or USB I do get the 13.5Vdc on all Pin 10's.I checked the 3 position USB / AM / LSB switch and it is switching the proper 13.5VdcAll other Line No's (test points) show correct voltage per 3.6.2.I replaced all Electrolytic Caps and no change.All function switches on the radio are performing properly.Also I noticed on USB I see a nice flat line on the scope and show modulation but only swing to 1 watt, on AM I show a normal pattern on the scope with zero modulation and dead key of 7 watts, on LSB I'm showing an AM pattern not a flat line with modulation and 1 watt. I get this on both Antenna A & B.All frequencies on all 40 channels TX are on the money.RX frequency is off on AM by about 2MHz (example ch20 rec on ch22), LSB & USB RX is spot on frequency.I have the owners, service manual and schematics but they are too big to post on here. I can send via email if requested.

author: LateLesley
author_rank: Frequent Contributor
timestamp: November 14, 2019, 03:41:19 am
content: My radio knowledge in very limited. Only popped in here to post a link to where folk can see schematics for this radio. They can be found here -http://www.cbtricks.com/radios/arf/2001/index.htm.There's 6 links at the bottom of the page.What a nice old school radio. Best of luck in repair of that beast.

author: Crambone
author_rank: Frequent Contributor
timestamp: November 14, 2019, 02:37:37 pm
content: I also have the service manual. I can email to anyone if they require it

author: Crambone
author_rank: Frequent Contributor
timestamp: November 15, 2019, 02:28:14 am
content: So being I’m new to all this schematic and troubleshooting I believe I’ve narrowed down my issue to the audio board A3 and possibly the Op Amp or IC.

author: LateLesley
author_rank: Frequent Contributor
timestamp: November 15, 2019, 02:55:09 am
content: Hmmm, that's funny, because looking at the schematic, I was thinking you should check 3U1 (MC1458P op amp) and the two transistors 3Q7 (2N3096) and 3Q6 ( TIP 32A). My reasoning was it was part of the circuit switched in, with switch S5A, which I believe switches between upper, lower and AM?? Though What put me off mentioning, is the differences in testing between the USB and LSB. That makes me think that maybe the LSB circuit might have problems, and could be affecting the AM side of things.

author: Crambone
author_rank: Frequent Contributor
timestamp: November 21, 2019, 01:45:27 am
content: It looks that the AM and LSB share a signal that USB doesn’t so you may be onto something. I haven’t had a chance to get back at it yet.
Calling all Keysight/Agilent U1272A owners! - Page 1
Forum section: electronics / repair

author: IbnBattutiFrutti
author_rank: Newbie
timestamp: March 01, 2024, 10:27:58 pm
content: I recently got a damaged U1272A on ebay. It appears to have suffered some sort of crushing impact, which destroyed the LCD and the knob.Getting replacements from Keysight was simple enough, but there's some component damage that I spotted on the PCB. One IC with some lifted pads and six cracked ceramic SMD caps. Fixing the pads is no trouble, but reading values from cracked caps definitely is.I've marked the numbers and locations on the attached image (not my board, taken from Dave's teardown video). Would anyone out there be willing to measure a few caps on their U1272A?

author: IbnBattutiFrutti
author_rank: Newbie
timestamp: March 03, 2024, 06:12:42 pm
content: Any takers? Alternately, does anyone have any experience getting this kind of info from Keysight/Agilent support? I can't imagine they give it out, but I don't know for certain.

author: Jwillis
author_rank: Super Contributor
timestamp: March 03, 2024, 10:57:44 pm
content: Check the data sheets for the chips closest to the capacitors in question. They might give some clue as to the capacitor value. Cracked SMD capacitors usually indicates and over voltage scenario. I wouldn't be surprised is some of the chips are fried as well.

author: wraper
author_rank: Unknown
timestamp: March 03, 2024, 11:06:53 pm
content: Quote from: Jwillis on March 03, 2024, 10:57:44 pmWhere did you hear this nonsense? Cracked MLCC means mechanical stress/impact.

author: wraper
author_rank: Unknown
timestamp: March 03, 2024, 11:32:34 pm
content: C153 is connected in parallel to at least 3 other same looking caps. So desolder one of them and measure.C127 10nFC110 ~4pFColor indicates caps above are either C0G or other stable ceramic.C114 and C109 2.2nFC106 120nFColor indicates these are X7R or similar unstable ceramic.

author: IbnBattutiFrutti
author_rank: Newbie
timestamp: March 04, 2024, 12:43:41 pm
content: You are a life saver! Thank you so much!
Cambridge Audio Azur 740A dead PIC - Page 1
Forum section: electronics / repair

author: Halide
author_rank: Contributor
timestamp: July 16, 2019, 09:03:28 am
content: HiI have problem with my CA 740A. The 5V rail is totally shorted. I checked it and its the PIC micro. Do you know where I can find the .hex file? I wrote a email to CA support but they cant send me the hex files. Maybe someone have this file and could send or sell it.

author: vealmike
author_rank: Regular Contributor
timestamp: July 16, 2019, 11:42:29 am
content: Presumably you have found this:https://www.manualslib.com/manual/1512796/Cambridge-Audio-740a.html?page=60#manualThere's a phone number on the front. The manual says you should request the .hex file from the service department. Might be worth ringing and asking to be put through. Good luck.

author: Halide
author_rank: Contributor
timestamp: July 16, 2019, 03:42:21 pm
content: Thanks, tomorrow I try to call there, although in the email tech support they told me that they cant send me the .hex file.

author: CJay
author_rank: Super Contributor
timestamp: July 16, 2019, 06:23:28 pm
content: The service manual jogged my meory when I saw Kanda specified as the programmer, Kanda supply device programmers that can limit the number of times you can program chips, so you load it up with the HEX and 'tokens' purchased, when they're 'spent' no more programming until you buy more.Cambridge won't supply the HEX, you'd need to ask if they will supply a programmed chip.
cambridge Audio Azure 651a protection mode  Help Biasing - Page 1
Forum section: electronics / repair

author: Perrin21
author_rank: Regular Contributor
timestamp: June 27, 2019, 04:32:09 pm
content: hi, I am currently trying to diagnose the fault on a Cambridge Audio Azure 651a amplifier but so far I'm struggling as there appears to be very little evidence of a fault. when the unit is powered up it immediately defaults to protection mode and the protection light flashes once to describe a DC fault. I have checked for dry joints, all capacitors etc and tried to test the Darlington transistors, however they are a type I am not familiar with having 4 pins not the usual 3. I have also noticed there is hot glue all over many of the resistors and I am suspecting this may be causing some issues. can anyone suggest anything else I should check?

author: Perrin21
author_rank: Regular Contributor
timestamp: July 05, 2019, 08:06:21 pm
content: Well it seems I am possibly making some progress with this amp. I have noticed there are 3 components missing from the input board power section.D17 400V 1A rectifier 1N4004 D041D15 15v 1A Signal Diode 1N4148 D035C78 100nF 250v Poly CapacitorI have checked the service manual and all should apparently be there but I'm guessing they were fitted badly and simply fell out. Where they are now is anyone's guess though. Will order the parts tomorrow and see if it solves the problem.

author: Perrin21
author_rank: Regular Contributor
timestamp: July 06, 2019, 02:58:38 pm
content: OK parts now added and the amp now powers up fine, it passes the self test and the speaker relays trigger on but... now I have a new fault.The protection circuit now kicks in and triggers 3 flashes which apparently means Temporary Overload. My guess now is that the amplifier bias is out and it's triggering the protection circuitry. I have never adjusted bias before, can anyone help me with the process. I can see two arrows on the board but it isn't clear where to connect to and the service manual doesn't mention it. There are 4 adjustment pots and a value in mV to set to. I have a few concerns.1) as the amp needs to be powered on there will be high voltage on the board and I don't want to be shocked so I don't want to link the wrong points. can anyone confirm that I'm measuring from the Diode to the resistor leg as marked in my pic or is this wrong?2) assuming I get it powered up, I am supposed to leave it on before biasing it but if it trips protection then it isn't technically on so should I disable the protection system?3) is there a specific order I should adjust the bias? left then right or doesn't it matter?4) is it OK to power up the amplifier without speakers attached for the measurement?
Cambridge CD - Potential between audio path GND and Eath causing excess heating - Page 1
Forum section: electronics / repair

author: boumboauto
author_rank: Contributor
timestamp: December 07, 2023, 10:29:34 am
content: Hello,On a CD drive, after about 30min the audio start to deteriorate and converts from "music" to "noise". This happens whatever the CD is inserted, and it seems to be a "thermal" issue because if we let it cool for an hour, it outputs music again.When looking inside the CD player, I found a resistor on the audio path that it way too warm and this seems strange to me.On the schematic above, the GND symbol to the right is connected to the carcass and also to the power supply mains earth. This is thus the 0 potential reference.The fact that I measure -7.8VDC at the output stage of the preamplifier feels strange.When looking at the schematic, I had some clues and measured the voltage between the "Audio GND" and the "Carcass GND" and measured -7.8 VDC. This bias is applied to the resistance and thus generates about 1.2W which is way too much for it and make it warm/hot.I wonder if this is "wanted" and the manufacturer was a lit shy on the resistant power capacity, or this bias is not part of the design and comes from the preamp.From this schematic, there is a possibility to get a potential of 8V from the power supply of the preamps, but though the 2 resistors of 15k that should not be enough to drive a watt on the burned resistor. C35 may be shorted but sound is available on both channels, so the amp U4 is working.

author: CaptDon
author_rank: Super Contributor
timestamp: December 07, 2023, 01:49:04 pm
content: Is it possible the .1uf capacitor from the +8vdc rail is shorted?

author: boumboauto
author_rank: Contributor
timestamp: December 08, 2023, 12:33:17 pm
content: Ok the issue has been found, the metalic shield arround the audio circuits was touching a +8V rail. Thus refering the +8V to the Earth of the mains and causing havoc on the output resistor.

author: YurkshireLad
author_rank: Frequent Contributor
timestamp: December 08, 2023, 02:54:58 pm
content: "Precision"

author: tooki
author_rank: Super Contributor
timestamp: December 09, 2023, 10:32:05 am
content: Quote from: boumboauto on December 07, 2023, 10:29:34 amI think you meant “chassis ground”. A carcass is something… rather different!
CAMBRIDGE ME806D USB POWERED AUDIO MIXER - Page 1
Forum section: electronics / repair

author: geobee
author_rank: Contributor
timestamp: December 16, 2022, 07:19:22 am
content: Hi all, repairing this unit where the speaker protection relay has been melted by two 5 watt resistors next to it burning up. Easy enough repair as far as that goes, along with two shorted output devices. My issue is, the copper tracks under the board have been burnt up, and I cannot locate a schematic for it. If anyone would have a copy of at least the copper side of the board, that would be a great help. Cheers. Geoff
Camera Module Identification - Page 1
Forum section: electronics / repair

author: ryanm
author_rank: Newbie
timestamp: July 17, 2024, 02:21:07 am
content: Hi,I'm currently repairing a submersible inspection camera that wasn't as water proof as the job required. The camera module itself (pic below) is just an analog camera so I can replace the whole thing. I'm wondering if anyone has seen this camera physical format before with an external thread and knows what it is called? Every time I try to serach for answers I just get tripod adapters using camera and threaded as keywords.External thread is M20.

author: Poroit
author_rank: Frequent Contributor
timestamp: July 18, 2024, 08:34:33 am
content: "Deep-water Camera Underwater Robot Underwater UAV ROV Deep Water Analog Camera 100m"Aliexpress is showing something that looks similar.No markings or brands on any of the housings?

author: ryanm
author_rank: Newbie
timestamp: July 18, 2024, 11:52:55 am
content: There's a sticker on the camera, but it didn't come up with anything. I estimate (wild guess) the whole rig was produced possibly mid 90s so not suprising there's not much info online. You should see the "pictures" in the manual. It looks like someone painted a picture based on a verbal description of a fax of a Nokia 3310 screen display.It runs on a PAL signal so I ended up ordering one of these little cameras built for a drone;https://caddxfpv.com/products/caddxfpv-ant-lite-4-3-fpvcycle-editionIt's small enough to fit in the waterproof enclosure and compared to the old camera's 0.2lux min illumination rating it's 0.001lux so I think the client will be pretty happy with performace.

author: Poroit
author_rank: Frequent Contributor
timestamp: July 19, 2024, 01:51:25 am
content: If you want to take it further, maybe put your post in "Thermal Imaging and Cameras" section as those guys may be able to assist.Good luck.
Camera: Ricoh GR III lens mech. issue – ideas or schematic anyone? - Page 1
Forum section: electronics / repair

author: 0xPIT
author_rank: Regular Contributor
timestamp: June 27, 2023, 09:03:24 pm
content: Hi,so I got this Ricoh GR III super cheap that has – let's call it "a weak lens mechanism".Normally when powering on, this camera it is supposed to extend the lens and retract it on power off to make it pocketable. This usually works very quickly, I'd say some 100s of ms.When turning on in normal mode, it extends the lens very slowly and will ultimately stop, causing the software to abort and turning the camera off with a quickly blinking power LED.It turns on fine in playback mode which does not activate or extend the lens, so I know it generally works.I've disassembled it and the mechanical construction seems fine, there are no obstructions.When I power the DC lens motor with some 2-ish V, it extends/retracts the lens fine – just but slow, consuming around 30-40mA.I now suspect that the electronics (maybe even the software) drives the lens motor with some sort of boost converter to achieve the high speed from a 3V battery, and that thing might be the culprit, ie. it does not yield sufficient power.However, as usual these days, this thing has the tiniest parts without proper markings.Does anyone know more how this works, what the problem could be, and/or how/where to find/acquire service manual with the schematics?(The flat flex cables are all fine – this is a typical issue with many GR cameras).Thanks,pit

author: Koray
author_rank: Regular Contributor
timestamp: June 28, 2023, 09:59:26 pm
content: Could it be something to do with aging lubricants? Many years ago when reassembling a Panasonic digital camera I used an incompatible grease and the lens wouldn't work properly. Never found the correct viscosity for the grease.K..
Camera SoC identification - Page 1
Forum section: electronics / repair

author: dc101
author_rank: Regular Contributor
timestamp: May 28, 2021, 07:31:31 pm
content: Looking for some help trying to identify a chip with part number CLM9020 on it. This board is the main pcb of an Axon Flex body worn camera. I believe the chip is a dedicated Camera SoC similar to those made by Ambarella and HiSilicon, but I haven't had any luck searching for the vendor. The CSR chip on the right is some sort of bluetooth chip.

author: josh132
author_rank: Contributor
timestamp: May 28, 2021, 08:29:43 pm
content: Im not getting results for CLM9020 either, getting better results when trying LM9020. C in CLM maybe a branding thing. Not familiar with the logo on the ship.

author: amyk
author_rank: Super Contributor
timestamp: May 29, 2021, 03:21:54 am
content: http://www.aoelectronics.com/en/manufacturers-detail.php?tnid=156QuoteThe site (and company) appears to be gone, but fortunately the CLM90xx' product brief appears to have survived in the web archive:http://web.archive.org/web/20151216161748/http://www.corelogic.co.kr/down_pb/090916_JADE_PB_(5.0,2.0).pdf(my happiness upon seeing it was several MB and suggestive of a full datasheet was immediately erased upon opening it...)Here's a slightly earlier revision of your BlueTooth:https://cdn.datasheetspdf.com/pdf-down/B/C/5/BC57G687C-CSR.pdf

author: dc101
author_rank: Regular Contributor
timestamp: May 29, 2021, 05:15:27 am
content: Quote from: amyk on May 29, 2021, 03:21:54 amDang, that's some ninja google skills right there! Thank you!
Can anybody help me identify this part? (re: slide potentiometer; "B103") - Page 1
Forum section: electronics / repair

author: sofakng
author_rank: Regular Contributor
timestamp: October 01, 2024, 05:28:58 pm
content: I'm trying to repair a flight stick (joystick) for the Xbox and this slide potentiometer is broken. I disassembled it and the contacts (?) on the slide (?) are bent. I tried to bend them back but it doesn't seem to work.The slider is 60mm x 9mm x 6mm and has 3 contacts (2 on one side and 1 on the other)"B103" is written on the undersideThe other working potentiometer shows 6 Ohm - 5.2K Ohm.Can anybody help me find this? I've searched Mouser/Digikey and can't find a match.

author: fzabkar
author_rank: Super Contributor
timestamp: October 01, 2024, 05:46:16 pm
content: "103" = 10Kohm"B" = linear taper

author: Harry_22
author_rank: Frequent Contributor
timestamp: October 01, 2024, 07:21:05 pm
content: Hi!Try XVJ45 on Aliexpress

author: sofakng
author_rank: Regular Contributor
timestamp: October 02, 2024, 06:57:49 pm
content: Thanks very much!!
Can anybody identify this component? - Page 1
Forum section: electronics / repair

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: June 26, 2025, 12:34:13 am
content: It is on a solenoid controller. I can't find anything on it yet. The board isn't functioning, and I'm trying to go through component by component because no replacement boards are available. Early 2000's.

author: squadchannel
author_rank: Frequent Contributor
timestamp: June 26, 2025, 12:45:17 am
content: TLE4251D

author: Rat_Patrol
author_rank: Frequent Contributor
timestamp: June 26, 2025, 02:24:36 am
content: Quote from: squadchannel on June 26, 2025, 12:45:17 amI kept trying to identify the "D" as a "0"Thanks!
can anybody identify this SMD part? the part said GA S3  - Page 1
Forum section: electronics / repair

author: ErwinsCat
author_rank: Regular Contributor
timestamp: July 23, 2019, 01:42:09 pm
content: Hi,can anybody identify this SMD part? the part said GA S3 and silkscreen said U108 and 7711attached a photo for size comparison I hope it helps!Thanks

author: gamalot
author_rank: Super Contributor
timestamp: July 23, 2019, 03:59:48 pm
content: HE1A4A

author: fzabkar
author_rank: Super Contributor
timestamp: July 23, 2019, 08:45:56 pm
content: Another possibility?S-80230AG, Seiko, negative voltage regulator, -3V, 20mA, marking GA + xx, SOT-89-3:http://kazus.ru/datasheets/pdf-data/4686716/SII/S-80230AG.html

author: ErwinsCat
author_rank: Regular Contributor
timestamp: July 23, 2019, 10:12:00 pm
content: you people are geniuses!!!yes, it has to be the "S-80230AG, Seiko, negative voltage regulator" how did you "GA S3" translate to "S-80230AG, Seiko, negative voltage regulator" ...Thank you very much.

author: fzabkar
author_rank: Super Contributor
timestamp: July 23, 2019, 10:38:51 pm
content: http://www.smdmark.com/en-US/search/code?id=GAhttp://chip.tomsk.ru/chip/ChipDoc.nsf/vc1?readform&start=1500&view=smd&cat=G&count=500https://www.google.com/search?q="s-80230ag"%20filetype:pdf

author: ErwinsCat
author_rank: Regular Contributor
timestamp: July 25, 2019, 07:18:07 am
content: I found a replacement on eBayhttps://www.ebay.com.au/itm/5PCS-X-S-80230AG-GA-SOT89-SEIKO/333124381628?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649It doesn't look very promising but I ordered them anyway. it seems like an obsolete part. how people find a replacement for parts like this? I spent a couple of hours on mouser and djkey couldn't find anything to replace this part... it seems very odd!!! I thought there must be lots of replacement for this part (-3v regulator)

author: MaxFrister
author_rank: Regular Contributor
timestamp: July 25, 2019, 06:29:31 pm
content: One resource for obsolete parts is octopart:https://octopart.com/search?q=S-80230AG
can anybody inspect theys pictures for fault? - Page 1
Forum section: electronics / repair

author: aqarwaen
author_rank: Regular Contributor
timestamp: January 12, 2020, 05:21:47 pm
content: tv only shows black screen and only sound coming.then i turn on from remote light turns white,it means its on..visually inspected all capacitors but did not see any damage..did not measure any them..can anybody in theys pictures see anything wrong on theys boards?https://imgur.com/a/JEjxhuO

author: dicky96
author_rank: Regular Contributor
timestamp: January 12, 2020, 05:30:30 pm
content: The power supply in these TVs is a model that is commonly known to fail.The fact you have sound and no picture suggests you have no backlightsYou are not going to diagnose the problem with just a visual inspection you will need to measure some voltagesFirst you need to check the voltage supplying the LED backlights. Looking at those pics there are two strings of LED lights as there are two connectors.When you turn on the TV what voltage do you get supplying the LEDs? There are two 2 pin connectors one for each LED string (red/black and I think it is brown/white looking at those pics) . Measure each pin to ground and also measure the voltage across the two pins of each connectorWhat do you get? The voltage may not be steady, for example it may climb slowly to some voltage around 130V-150V then suddenly drop and start rising again.The LED driver chip (MAP3022 or something like that) is on the other side of the PCB. It is also very common for the one or both of the LED strings to fail rather than for the PSU board to fail. What test equipment do you have? A multimeter is essential and a scope may be needed depending where the problem is. An LED back light tester would be very very useful but I doubt you will have thatRich
Can anybody recognize this component? - Page 1
Forum section: electronics / repair

author: Aller
author_rank: Contributor
timestamp: May 27, 2022, 12:14:46 am
content: Hi All,Could anybody please recognize this component? It has no markings and there is no designator on the board. It has no continuity, the diode test shows also OL both ways. Most likely it's designed to go into some bracket/socket (mounting studs at both ends) but it was simply soldered to the board. The creamy/off-white middle is a plastic tube. The board is a part of an Earth Bore pointer.

author: bob91343
author_rank: Super Contributor
timestamp: May 27, 2022, 12:18:39 am
content: Capacitor? Fuse? Glow lamp?

author: Aller
author_rank: Contributor
timestamp: May 27, 2022, 12:23:10 am
content: Thank you for a quick response. It cant be a glow lamp because the plastic tube is sensitive to heat. It can't be a capacitor (the plastic tube). My original thought was it was a fuse, but if it is, it's blown and I have no idea what to replace it with. Well, I could just short it for testing and see what happens... And if the circuit works, I will guestimate the value. That sort of could make sense since the original fault was some blown LEDs on this board and a bad voltage regulator on the other (attached to it) board...

author: fzabkar
author_rank: Super Contributor
timestamp: May 27, 2022, 01:27:56 am
content: If it's a fuse, then it would be in series with the supply. I can't be sure, but it looks like one end connects to the LED resistors, all of which are wired to a common supply.Edit:Could it be a "fuse link"?https://www.swe-check.com.au/product/cello-lite-nc1-fuses-500vac-250vdchttps://www.swe-check.com.au/catalog/102.pdf(datasheet)https://www.littelfuse.com/products/fuses/specialty-power-fuses/fuse-links.aspxhttps://www.littelfuse.com/media?resourcetype=datasheets&itemid=5001cec6-5012-4f52-892e-e2bac7062126&filename=rln-rls-datasheetQuoteThese are high voltage, high current fuses, so different regulations may apply in low voltage applications.

author: Aller
author_rank: Contributor
timestamp: May 27, 2022, 04:27:21 am
content: The supply for this device is from 4 parallel 9V batteries, so it's 9V and for 10 red LEDs it would be some 200mA plus some other components overheads. I think that installing a 500mA fuse should do it if it's a fuse.

author: strawberry
author_rank: Super Contributor
timestamp: May 27, 2022, 06:59:03 am
content: SMD Sensitive Vibration Sensorsome use spring some use metal ball

author: Aller
author_rank: Contributor
timestamp: June 07, 2022, 02:09:05 am
content: Thank you for your answer. Spot on! Sorry for the delayed response
can anyone explain the ohm symbol after the mv on this scope? - Page 1
Forum section: electronics / repair

author: mkz
author_rank: Newbie
timestamp: December 13, 2021, 05:51:56 pm
content: HiSee the pic.Is this something to be concerned about if wanting to buy this scope? all tests passed, but I see an Ohm symbol after the four channels mv at the bottom, and not all are the same value (nothing connected on any of the 4 channels)thanks

author: ataradov
author_rank: Super Contributor
timestamp: December 13, 2021, 06:03:47 pm
content: I think it might be showing 50 Ohm termination on the input. In any case it is not a concern for the purchase. The same symbol is present on screenshots in the user manual.

author: w2aew
author_rank: Super Contributor
timestamp: December 13, 2021, 06:10:02 pm
content: Quote from: ataradov on December 13, 2021, 06:03:47 pmYes indeed, the ohm symbol after the vertical scale value DOES indicate that the channel has the 50 ohm termination engaged. You may also sometimes see a "BW" which would indicate that the user turned on the low-pass filter (usually 20MHz) on that channel.

author: jwet
author_rank: Frequent Contributor
timestamp: December 13, 2021, 06:11:29 pm
content: This indicates that the 50 ohm termination is active on the channel. You should be able to turn the terminator off and on for any channel. Note also that when the terminator is active, the input range is limited to about 5v on most scopes, this would be .5W dissipation of the terminator. In very basic term (no flames from experts please and forgive me if you know this) A 50 ohm termination is used to make high frequency measurements without causing reflections in cabling. It becomes important when the wavelength of your setup gets over about 10% of a wavelength. Wavelength in meters is 300/F in megahertz. At 30 Mhz- a wavelength is 10 meters, if your setup gets to be on the order of a meter, you'll start seeing transmission line effects. At very high frequencies into the microwave range, everything has to be terminated and run in transmission line type structures to control impedances and get reliable results. Turn if off.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 13, 2021, 07:45:39 pm
content: Essentially when in 50 ohm input mode, consider the scope a "Load" and don't put anything into it that you would not put into a very small load.Here is one example: You can use this setting to check the 50 ohm outputs of things like signal generators, you will get the correct voltage reading on your scope that corresponds to the dBm or microwatt output of your signal generator. As always E=IR and R in this case is 50.
Can anyone help identify this ON semi IC? - Page 1
Forum section: electronics / repair

author: Keg
author_rank: Newbie
timestamp: May 06, 2024, 12:52:36 am
content: I've been trying to find a datasheet on this IC. It's ON semi, 14 pin, smd. Marked 14011BG & PNYC52. Can't find it. Anyone else?Thanks, Ken

author: CountChocula
author_rank: Unknown
timestamp: May 06, 2024, 01:01:02 am
content: Looks like it could be aMC14001logic gate (a quad 2-input NAND, to be specific, which is the MC14011B).

author: Keg
author_rank: Newbie
timestamp: May 06, 2024, 01:27:52 am
content: I'll check out the datasheet on it and see what the pinout is on it.Thanks, I'll check it out.Why no datasheet? Could it be proprietary just for the products company?Ken

author: Keg
author_rank: Newbie
timestamp: May 06, 2024, 01:31:40 am
content: Ya, that's probably it. I was just looking it up wrong.Ken

author: srb1954
author_rank: Super Contributor
timestamp: May 06, 2024, 01:36:19 am
content: Quote from: Keg on May 06, 2024, 01:27:52 amAdd the On Semi prefix "MC" on the beginning of the part number and you will easily find a datasheet.
Can anyone help my with repairing a SENCOR SLT 2225DVBT television? - Page 1
Forum section: electronics / repair

author: MrWifiHifi
author_rank: Regular Contributor
timestamp: October 02, 2019, 03:47:36 pm
content: HiI've got this TV from friend of mine, because it was brokenSo I dissassebled it and this is what I found:- at first TV won't turn on, but after a while it turn on, small led on front panel went from red to blue and it was looking it will start...but then blue led turn off, on screen was no picture and red led started to glow again- as I 've got TV dissassembled I measure the voltages on the main board... Idiscoverd that the main board voltages values looks fine but...the small control pcb and the back of the lcd did't get any power....no input voltage at allI want this tv get fixed because it have many input ports such as VGA, SCART, HDMI, CINCH and it also have an USB port for plaing movies from USB stickCan someone help me with this? Is there any way to find the fault component?I would appreciate any help and I would be very thankful for it
Can anyone ID this binding post knob? - Page 1
Forum section: electronics / repair

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 21, 2021, 08:01:26 pm
content: Used on a Kikusui Electronics PLZ72W Load tester.. I'm looking for the cream colored one (missing on my unit).It's not any Pomona I could find. It's not a Greyhill 29, though that is closest.Worst case I'll have to replace with a different brand.

author: eevcandies
author_rank: Regular Contributor
timestamp: April 27, 2021, 05:23:26 am
content: maybe take a look here for some ideashttps://www.eevblog.com/forum/testgear/where-can-i-buy-these-type-of-female-banana-ports-(kikusui-dc-electronic-load)/

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 27, 2021, 02:38:02 pm
content: Quote from: eevcandies on April 27, 2021, 05:23:26 amThank you. I searched before I posted but missed this.

author: fcb
author_rank: Super Contributor
timestamp: April 27, 2021, 03:45:48 pm
content: These look like SATO parts.http://www.satoparts.co.jp/JPN/item/T/list.php

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 27, 2021, 04:12:30 pm
content: Quote from: fcb on April 27, 2021, 03:45:48 pmIt's close to a couple but not exact (to my eye). The metal portion that is inside the case looks like T-1. They have the reduction in diameter than the flat end (no thread).I emailed Kikusui Japan. Maybe they will tell me. Maybe
can anyone ID this SMD diode ?  - Page 1
Forum section: electronics / repair

author: GamingUnleashed
author_rank: Newbie
timestamp: August 17, 2021, 11:24:37 am
content: unsure what the A2 3/7 meanscharger for this inverter fried some resistors and possibly the SMD diodes as wellhttps://voltronicpower.com/en-US/Product/Detail/InfiniSolar-Super-4KW

author: xrunner
author_rank: Super Contributor
timestamp: August 17, 2021, 12:16:04 pm
content: I think it's a switching diode 1N4148. The 3 7 indicates the date code -https://www.tissusa.com/catalog/Datasheet/1N4148W.pdf

author: fzabkar
author_rank: Super Contributor
timestamp: August 17, 2021, 11:21:48 pm
content: http://www.smdmark.com/en-US/search/code?id=a2

author: GamingUnleashed
author_rank: Newbie
timestamp: August 18, 2021, 09:49:02 am
content: thank you , I will steal a donor of the non working board and order some as spares

author: peter1980s
author_rank: Newbie
timestamp: August 19, 2021, 03:55:12 am
content: just check the location and replace with common one,like 1N4148 for low volt location and A7/F7 for high volt.
Can anyone identify these SMD semiconductors? - Page 1
Forum section: electronics / repair

author: Bargainhunter
author_rank: Regular Contributor
timestamp: June 30, 2024, 01:24:26 am
content: I need help looking for replacements for these SMD semiconductors. I will post photos. The board is from a Pioneer SX-S30 receiver and is a SMPS.The first semiconductor is Q904 and is marked AZ43W. Second is D905 and is marked L68. Last is D906 and has the markings of two diamonds side by side with the number 66 and below is marked CU1M. I'd appreciate it if anyone can tell me what the replacements are.Thank you very much.

author: fzabkar
author_rank: Super Contributor
timestamp: June 30, 2024, 01:48:39 am
content: AZ+xxW = INA5001AP1https://www.idc-com.co.jp/product/Search/Pdf/en/111/INA5001AP1/0/(datasheet)https://spares2repair.co.uk/sony-transistors-tr-ina5001ap1-t111-1w(photo)I'm guessing that CU1M is an ultrafast 1kV 1A rectifier, but that's a purely intuitive guess.

author: Bargainhunter
author_rank: Regular Contributor
timestamp: July 06, 2024, 07:16:44 pm
content: Thank you for your help. CU1M is an ultrafast 1kV 1A rectifier,It is reading open on my diode check multimeter.I will order a replacement and let you know how it turns out.
Can anyone identify this opto? - Page 1
Forum section: electronics / repair

author: Jester
author_rank: Frequent Contributor
timestamp: April 30, 2022, 03:27:39 pm
content: This is almost certainly an opto isolator, or digital isolator of some sort.There are a pair of them on a USART isolatorCase marking is:600501Is there a website with case marking lookup?

author: fzabkar
author_rank: Super Contributor
timestamp: April 30, 2022, 04:38:03 pm
content: HCPL0600, Fairchild / ON Semi, single channel high speed 10 Mbit/s logic gate optocoupler, marking 600, SO8:https://www.mouser.com/datasheet/2/149/HCPL0601-1010327.pdfhttps://www.aliexpress.com/item/4000284850062.html(photo)https://ipv4.google.com/search?q=filetype%3Apdf+"absolute%20maximum"+optocoupler+OR+optoisolator+600https://ipv4.google.com/search?q=filetype%3Apdf+"absolute+maximum"+optocoupler+OR+optoisolator+"600"+soic8+OR+sop8+OR+so8+OR+"soic-8"+OR+"sop-8"+OR+"so-8"

author: cdev
author_rank: Super Contributor
timestamp: April 30, 2022, 05:04:32 pm
content: A bidirectional optoisolator.These are used on some SDRs.
Can anyone supply the values of this cap on a Hayward 2518861-001 driver board - Page 1
Forum section: electronics / repair

author: jcrubin
author_rank: Frequent Contributor
timestamp: October 15, 2022, 01:36:38 pm
content: The cap blew up and took the value with it.... sadly...Hayward 2518861-001 driver board. Its a board for a Hawward pool pump.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 15, 2022, 03:52:27 pm
content: on theses capacitors you have markings on the top, do you have some ?

author: fzabkar
author_rank: Super Contributor
timestamp: October 15, 2022, 06:56:42 pm
content: Is the main chip identifiable? Perhaps its datasheet (?) will have an application circuit that will give us a clue.

author: jcrubin
author_rank: Frequent Contributor
timestamp: October 16, 2022, 08:04:14 pm
content: I believe it supports the TNY274-280https://componentstree.com/wp-content/uploads/2021/09/TNY274PN-IC-Power-Integrations-Off-Line-Switcher-IC.pdfIt maybe a .1 1 or 10uf from the documentation.
Can anyone tell me the values of 3 ceramic disc capacitors? - Page 1
Forum section: electronics / repair

author: Crambone
author_rank: Frequent Contributor
timestamp: June 27, 2020, 02:19:10 am
content: Can anyone give me the values of these 3 different ceramic disc caps? Also what I might use to replace? They are in a hot high voltage tube area.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 27, 2020, 02:33:29 am
content: 472 would be : 0.0047 micro farad (uf) or 4.7 nano farad473 would be 0.047 micro farad (uf) or 47 nano farad (nf)103 would be 0.01 micro farad (uf) or 10 nano faradhere some infoshttp://www.kiloohm.info/3-digit-capacitor/472

author: Crambone
author_rank: Frequent Contributor
timestamp: June 27, 2020, 02:48:25 am
content: Bookmarked that, thank you!

author: greenpossum
author_rank: Frequent Contributor
timestamp: June 27, 2020, 02:50:19 am
content: You'll notice it's similar to the resistor code, for XYZ, value is XY + Z zeros pF. A similar code is used for SM resistors.

author: Crambone
author_rank: Frequent Contributor
timestamp: June 27, 2020, 03:38:26 am
content: Does the Z on 473Z stand for +80% -20% ?Can I use a film cap at 10%?

author: Vovk_Z
author_rank: Super Contributor
timestamp: June 29, 2020, 02:25:24 pm
content: Yes.