hybridfree/eevblog-posts huggingface dataset:
Need help for identification of SOT23 component on a Mini 0805 dashcam - Page 1
Forum section: electronics / repair

author: Koray
author_rank: Regular Contributor
timestamp: March 03, 2017, 01:04:27 pm
content: Hi all!This Ambarella A7 Mini 0805 dashcam has a blown SMD component, probably a SOT23-5 voltage regulator (dimensions: 1.7mm x 3.0mm). With a loupe I can read markings BQ:R0.. which (I guess) is identical with another component at the other end of the board, BQ:R02, and two other SMDs on the black PCB, U3 and U12. When you connect 5V power the main A7 chip gets very hot and no sign of life. Prior to this fault the dashcam was having issues with battery charging. I don't want to waste a lot of money on this, but maybe a few dollars on an ebay SOT-23-5 listings. What should I look for? A 3.3V or 5V voltage regulator?Attaching the photos of the boards, the blown component is in the first photo, on the right-top edge. Same component can be seen at left middle edge on the same board and as U3 and U12 on the black sensor/input board.Thanks for any help.

author: bktemp
author_rank: Super Contributor
timestamp: March 03, 2017, 01:27:58 pm
content: RT8059:http://www.richtek.com/assets/product_file/RT8059/DS8059-05.pdf

author: Koray
author_rank: Regular Contributor
timestamp: March 03, 2017, 02:37:34 pm
content: Thank you sooo much! Only $1.55 for 10 pieces at AliExpress. Free shipping! Yay!K.
Fluke 187 switch contacts - Page 1
Forum section: electronics / repair

author: Robomeds
author_rank: Frequent Contributor
timestamp: December 17, 2016, 07:53:17 am
content: Anyone know where to get the little wiper contacts used in a Fluke 187 multimeter switch? I had my meter open and knocked it off my bench. After reassembly it was acting very odd. Well, I opened it up and discovered I had lost a switch wiper contact. I hope to find it but so far, no luck. Any suggestions for locating replacements? Is there any chance these are off the shelf items (probably not).

author: retiredcaps
author_rank: Super Contributor
timestamp: December 17, 2016, 05:46:08 pm
content: Ebay seller a-fluke might have some?Alternatively, if you can't find it, ping Excavatoree via PM here and see if he has a dead/broken Fluke 187/189?BTW, I have been busy with other things and haven't revisited the Fluke 27 U1 yet.

author: Robomeds
author_rank: Frequent Contributor
timestamp: March 02, 2017, 01:07:01 am
content: Score! Ebay seller Fluke-USA had one. Now I'm just waiting to get the part back to I can put the meter back together.Thanks for the suggestion to check the ebay sellers!

author: retiredcaps
author_rank: Super Contributor
timestamp: March 02, 2017, 03:13:41 am
content: Quote from: Robomeds on March 02, 2017, 01:07:01 amGood job finding one. Can you take a clear focused picture of the switch contacts for future reference and others. Thanks.

author: Robomeds
author_rank: Frequent Contributor
timestamp: March 03, 2017, 05:32:44 am
content: When I get it, sure though you can see them quite clearly in this threadhttps://www.eevblog.com/forum/testgear/fluke-187/

author: retiredcaps
author_rank: Super Contributor
timestamp: March 03, 2017, 06:41:28 am
content: Quote from: Robomeds on March 03, 2017, 05:32:44 amIt never hurts to have multiple photos for archive purposes. Some people use external links/hosts for their photos and those, over time, disappear.Also, your photos may show an angle that the others don't and that may help me or someone else in the future. I too have a 187. It is one of my favourite meters.

author: z01z
author_rank: Regular Contributor
timestamp: March 03, 2017, 09:11:36 am
content: Here's a different angle then.

author: Robomeds
author_rank: Frequent Contributor
timestamp: March 04, 2017, 01:50:13 am
content: Success! I'll post a few pictures of the contact when I get them off the phone. In the mean time all is well!
Tektronix rotary switch - Page 1
Forum section: electronics / repair

author: djnz
author_rank: Regular Contributor
timestamp: March 01, 2017, 02:08:12 pm
content: The Tektronix AM502 has this peculiar rotary switch which has thin metal wipers which are pushed into place by rotation of the knob, causing different positions to short. Unfortunately, some of them seem to have been bent out of shape causing them to not make contact any more. I am going to try to straighten them, but does anyone know any sources for getting a replacement?The Tektronix part number is 263-1005-00. It is a 10 position rotary switch (single pole, 10 throw).Thanks.

author: PaulAm
author_rank: Frequent Contributor
timestamp: March 01, 2017, 08:24:14 pm
content: Find another AM502 parts donor is probably your best bet.Sometimes the aftermarket Tek parts distributors have NOS stock but that switch seems to be pretty rare.
Vintage Triad TY-73 Engineering Bulletin - Better Copy Than On Triad Site? - Page 1
Forum section: electronics / repair

author: KJ-90
author_rank: Contributor
timestamp: March 01, 2017, 05:59:32 pm
content: I was wondering if anyone knows of a source for a better resolution copy of the vintage Triad TY-73 engineering bulletin on the Triad Transformer historical archive web site. With the greatest respect to Triad, some of the pages with respect to wiring diagrams and transformer pin connections are blurred and hard to read. Any ideas?
Help opening Yokogawa 2426A - Page 1
Forum section: electronics / repair

author: staze
author_rank: Frequent Contributor
timestamp: February 27, 2017, 10:02:23 pm
content: Howdy All,Anyone know how to get a Yokogawa 2426A open? There's a single screw in the battery compartment, but the unit doesn't want to open from what I can tell.Also, does anyone have a manual for one of these? Closest I can find is the MY40.Thanks!

author: singapol
author_rank: Frequent Contributor
timestamp: February 28, 2017, 09:54:18 am
content: Look closely... hint...have you open up computer LCD monitors before?

author: mzacharias
author_rank: Frequent Contributor
timestamp: February 28, 2017, 11:35:41 am
content: Sometimes screws are hidden under rubber plugs that also function to prevent sliding around on a smooth bench top.

author: staze
author_rank: Frequent Contributor
timestamp: February 28, 2017, 05:21:53 pm
content: No feet, so that's not the issue.I was really hoping it wouldn't have clips. =(On a side note, I'm looking for replacement battery terminals, but they seem to be an odd size. Most of the "spring on one side, bump on the other" are 25mm long. These are 30mm.Looking around Aliexpress, it almost seems like there's a standard that I'm missing. There's reference to S29 (Spring 29mm?)Anyone know?

author: grifftech
author_rank: Frequent Contributor
timestamp: March 01, 2017, 03:38:18 pm
content: Quote from: mzacharias on February 28, 2017, 11:35:41 amor under labels
Fluke 85 Display - Page 1
Forum section: electronics / repair

author: skylinrcr01
author_rank: Contributor
timestamp: February 24, 2017, 06:40:51 pm
content: Hey all,I have a fluke 85 DMM that has a display with some segments that don't work. I tried replacing the elastomers for the LCD, and also cleaning the contact strip on the LCD as well as the main board, but the problem persists. I did notice that the contact pads on the main board are black, which I have never seen before, typically they are gold or silver. The LCD is chipped in the corner as well, but at certain viewing angles it's fine, so I'm not sure the chip is affecting it at all.Any ideas?

author: ModemHead
author_rank: Frequent Contributor
timestamp: February 25, 2017, 02:16:40 am
content: The b and g segments are all out, also the lo-bat, MIN and others connected to the H2 backplane. That implies that H2 is dead (or weak), which is pin 20 on the LCD, driven from pin 61 on the QFP chip. LCD pin 20 is the one on the top row, left end. Which just happens to be where that chipped glass is...

author: retiredcaps
author_rank: Super Contributor
timestamp: February 25, 2017, 03:03:42 am
content: Reminds me of this case over at badcaps.net almost 4 years ago (you have to be a member to see the pictures)http://www.badcaps.net/forum/showthread.php?t=27198Same problem with chipped glass leading to missing segments.PS. How time flies. Modemhead was also participating in that thread.

author: SeanB
author_rank: Super Contributor
timestamp: February 25, 2017, 06:15:10 am
content: Chipped and missing LCD drive from the display. The black pads are designed that way, with a conductive carbon coat so the Zebra strip does not have contact issues from oxide formation, it is a deposited carbon layer there so there is only a carbon to carbon connection ( and thus no corrosion) to the zebra strip, nothing to worry about.What you need is a new LCD display.

author: skylinrcr01
author_rank: Contributor
timestamp: February 28, 2017, 02:45:10 am
content: Quote from: SeanB on February 25, 2017, 06:15:10 amAh, that makes sense. Thanks for the replies everyone.
Micronta 22-167 - Page 1
Forum section: electronics / repair

author: tosomja
author_rank: Newbie
timestamp: February 26, 2017, 09:10:08 pm
content: I have seen help on this meter here before...there is a posting with picture of one open.I have a broken PTC located near r21 and r20 close to the screw that holds it together.Could anyone be kind enough to measure the ohms of the PTC and let me know?I rather fix it and gift it to someone than throw it out.ThanksRegardsPaul

author: SkyMaster
author_rank: Frequent Contributor
timestamp: February 27, 2017, 12:58:01 am
content: Hi,Maybe this is the thread you are making reference to:https://www.eevblog.com/forum/testgear/micronta-22-167-schematic-needed/But I am not sure there is any information helpful to you there.
Finding old oscilloscope parts - Page 1
Forum section: electronics / repair

author: Rutherfordium
author_rank: Contributor
timestamp: February 26, 2017, 10:25:12 pm
content: So, I have a Goldstar 9100P analog scope, and I quite like it. Unfortunately, though, the time base B switch is physically destroyed. While looking for spare parts on ebay and the like I found entire oscilloscopes being sold for spare parts, and the shipping/asking price was pretty crazy for a single switch.Are there any good sources for obsolete parts like this, in particular oscilloscope parts? I guess this is the problem with getting a less famous brand of scope for cheap.

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: February 26, 2017, 10:44:55 pm
content: That's the problem; there's a whole subculture devoted to vintage big name scopes like Tektronix and HP. I can still get NOS knobs and transistors today for my doorstop, but for a lesser known brand? Not so easy.Best bet is to shop for modern knobs, things like shaft sizes and set screws are still the same.

author: tautech
author_rank: Super Contributor
timestamp: February 26, 2017, 10:51:04 pm
content: There WILL be members with Goldstar scopes in various states of repair so place a WTB ad in the forums Buy/Sell/Wanted.

author: Rutherfordium
author_rank: Contributor
timestamp: February 26, 2017, 11:12:18 pm
content: Oh, great idea. Hadn't noticed such a forum. Just new here. Thanks.
Part Search FSP035-1pI01 (VX 924 Monitor) - Page 1
Forum section: electronics / repair

author: revelator
author_rank: Newbie
timestamp: February 26, 2017, 10:19:02 am
content: Hi thereI'm trying to repair an old monitor power supply where it seams that one of the spools on the input has gone to smoke.I do find Schematics for the psu (FSP035-1pI01) online but im "to stupid" to find out what part the spool is. The placement is labeled as L111 on the board and in the schematics.Maybe someone can help me out with this. So long David

author: capt bullshot
author_rank: Super Contributor
timestamp: February 26, 2017, 10:53:22 am
content: This is the common mode inductor in quadrant D2 of the second page.But ... these things release their magic smoke typically because something else failed: e.g. T100 internal short, Q320 failed.
Studio Strobe ELECTRA compact 500S - Page 1
Forum section: electronics / repair

author: anphotoart
author_rank: Newbie
timestamp: February 25, 2017, 09:45:53 am
content: Hi,any schematic to repair the strobe ? thanks.Frankie

author: impulsite
author_rank: Newbie
timestamp: February 26, 2017, 09:26:30 am
content: Seems, circuit like in studio strobe Prolinca:http://impulsite.ru/viewtopic.php?p=7950#p7950I can draw original circuit diagram, if there are pictures of connections between PCBs and main capacitor and xenon tube.
Micronta 22-210 - Page 1
Forum section: electronics / repair

author: Nesser
author_rank: Newbie
timestamp: February 25, 2017, 12:34:54 pm
content: Need manual or schematic for Micronta 22-210.

author: JFJ
author_rank: Regular Contributor
timestamp: February 25, 2017, 04:28:07 pm
content: An eBay listing, for a scanned copy of theRadio Shack/Micronta 22-210 Instruction Manual, has a picture of the meter's schematic diagram:
Need help on identifying an IC & finding its datasheet  (probably Sanken made?) - Page 1
Forum section: electronics / repair

author: dav
author_rank: Regular Contributor
timestamp: February 15, 2017, 02:46:31 pm
content: It's a SOP-8 PWM controller.Its surface is a bit erased, I can read:SC621SK30or something like this.Any suggestions?

author: singapol
author_rank: Frequent Contributor
timestamp: February 15, 2017, 03:03:42 pm
content: Could be this..a SankenLED Light Management Unit Charge Pump,4 LEDs, 400mA Flash LED, Dual LDOs, and SemWireTM Interfacehttp://www.jotrin.com/product/parts/SC6210

author: dav
author_rank: Regular Contributor
timestamp: February 15, 2017, 03:15:45 pm
content: Thanks for reply.Mmm... strange, my device is a power supply

author: dav
author_rank: Regular Contributor
timestamp: February 15, 2017, 03:18:58 pm
content: Wait,the motherboard is Sanken branded! (it's the official power supply of a Sony TV/Monitor).Maybe this PWM controller is used on power supply, too

author: 1kostik1976
author_rank: Contributor
timestamp: February 15, 2017, 04:43:49 pm
content: /www.google.com.ua/search?q=sc6210&espv=2&biw=1600&bih=794&tbm=isch&imgil=Cu6M8lSQ2RgKlM%253A%253B53LgKiM9tf2QmM%253Bhttp%25253A%25252F%25252Fwww.elektroda.pl%25252Frtvforum%25252Ftopic2635890.html&source=iu&pf=m&fir=Cu6M8lSQ2RgKlM%253A%252C53LgKiM9tf2QmM%252C_&usg=__OmVvGJfnVZC0E-SjruTIDDqhLWY%3D&ved=0ahUKEwjsvM2qxZLSAhWFDCwKHa4QCbsQyjcIJQ&ei=Z4SkWKztGoWZsAGuoaTYCw#imgrc=Cu6M8lSQ2RgKlM:

author: dav
author_rank: Regular Contributor
timestamp: February 21, 2017, 06:11:08 pm
content: I cannot find its datasheet, neither on official website (Sanken SC6210).Just tried on jotrin, but after login it redirects on sanken website and nothing...Any help would be appreciated.

author: amyk
author_rank: Super Contributor
timestamp: February 22, 2017, 04:09:08 am
content: Reverse-engineer the schematic a little bit and find its pinout. It might be FAN6210, A6210, or some similar rebranded IC.It might also be SSC6210:http://www.sanken-ele.co.jp/en/news/contents/20070327_2e.htmwhich could be related to SSC620D series:http://www.datasheet4u.com/download_new.php?id=822986

author: dav
author_rank: Regular Contributor
timestamp: February 25, 2017, 01:20:02 pm
content: Reversed a bit the schematic, it's different from all of them.Here the pinout:1 Vcc2 Feedback3 GND4 maybe Over Temperature Protection (*)5 Startup voltage6 NC7 Gate Output8 100R to GND and a capacitor to GND(*) there is a path to a grey SMD component, with TH2 label, near the switching Mosfet. I measured 560R across it.It seems there is not a Current Sense function, as the Source is at GND.
Need help Gw instek 1850d psu weird display - Page 1
Forum section: electronics / repair

author: justin55162000
author_rank: Newbie
timestamp: February 22, 2017, 10:42:41 am
content: I am a newbie of electronic, sorry for my poor knowledge.I recently pick up a Gw instek gps-1850d psu, but the display read "1." as the photo, when nothing is plugged in.And when start the machine, it have some noise, I wonder if that's normal.Is that possible to be fixed?

author: JFJ
author_rank: Regular Contributor
timestamp: February 22, 2017, 01:29:22 pm
content: Might the power supply be in slave mode? For normal operation, the rear panel slider switch should be set in the 'MASTER' position.

author: justin55162000
author_rank: Newbie
timestamp: February 22, 2017, 01:55:18 pm
content: Thanks for your reply, but I have doubled check that I have chosen the master mode.

author: singapol
author_rank: Frequent Contributor
timestamp: February 25, 2017, 09:50:28 am
content: GW Instek service mauals are hard to come by...At leat there is the user manual:Instruction manual:http://assets.tequipment.net/assets/1/26/Documents/GPS-Small-series_manual.pdfNot the actual service manual but at least you can have an idea of how a similar power supply is constructedwith schematics. BTW there is a block diagram of GPS1850D in the user manual which is similar to GPD3303S.GDP3303 service manual:http://www.eltest.hu/pdf/GPD3303SM.pdfGood luck. You need to open up the box to investigate.
Simpson 260 series 6, Z/A (zero adj.) screw? - Page 1
Forum section: electronics / repair

author: onesixright
author_rank: Frequent Contributor
timestamp: February 22, 2017, 05:41:18 pm
content: Hi All,I got a Simpson 260 series 6, looks awesomeOn arrival it made some weird noise, like something was loose insideSo i opened it up to see what was going on.In the battery compartment i found a small piece of bakelite, not sure where it came from. But then, there was more (sounds), so i opened the backside, but nothing came out. Still a weird sound, coming from behind the glass. Carefully removed the glass, and ta-da! a small coper washer, that was ment to keep the glass in it place. So i cleaned the glass and put the thing back together (all good), but i'm now question how to deal with the Z/A screw?I moved the "fork" on the meter carefully in the center (pointing down), and then turned the Z/A screw straight up. Put it together and tried it. Needle does move, but it doesn't feel right. I also tried to turn the peg straight down, but didn't feel it was any better.I got two questions:1. How should the Z/A screw be positioned? Any handy tips put this back together (its very hard to see)?2. When / how do you actually use the Z/A screw?Thank you!

author: dacman
author_rank: Frequent Contributor
timestamp: February 23, 2017, 03:32:09 am
content: If you are referring to the mechanical zero screw for the meter movement, place the meter face up on a work surface, and adjust the mechanical zero adjustment until the meter is over 0 on the left. You should be able to turn it 360 degrees. Turn the screw in a clockwise direction, come up from below 0 and when the pointer is over zero, back the adjustment up a few degrees to disengage.

author: Gregg
author_rank: Super Contributor
timestamp: February 25, 2017, 03:09:23 am
content: Here is a nice youtube video about it:about 10 minutes into it it covers the adjustment screw little bit. Basically the post on the screw must engage the slot of the movement adjustment arm. You should be able to see the meter needle move both ways as you turn the screw back and forth. If it won't zero even with the post engaged, you may have a messed up hair spring in the movement. there are two hair springs that act to carry current to the coil and to return the needle to zero; these sometimes get the tiny filaments tangled a bit from a drop or something like the loose washer getting inside and may be able to be untangled if done very carefully. There are a bunch o youtube videos showing analog meter movement repair.It is nice to know that analog isn't dead, yet.
Agilent N5747 Power Supply OUP Error - Page 1
Forum section: electronics / repair

author: dundee
author_rank: Regular Contributor
timestamp: March 06, 2017, 06:45:25 pm
content: Hi Guys!I scored an Agilent N5747 power supply (60V / 12.5A ) .Pictures:https://www.dropbox.com/sh/8g3jg55eqle50jv/AABUiFE4NXSTDNbqPttIDrI3a?dl=0It shows direct on startup "OUP" on the Display and Protect ist flashing. The local sense wires at the back are connected.Measured 0 to 5 Volts varying at the Output with DMM.The pcb's are in good physical condition. Nothing burned to see.I refered to the manual. OUP is normally active when the OVP-Protection is triggered.But OVP is set to the Maximum (66V).It looks like there are no service manuals or schematics available. The original design is from TDK-Lambda (Genesys Series).Could it be that the calibration is missing? Anny other suggestions?Best RegardsSteffen
REQUEST LP-610B / LP-560 Logic Probe PCB front/back pics - Page 1
Forum section: electronics / repair

author: dav
author_rank: Regular Contributor
timestamp: February 24, 2017, 09:52:22 pm
content: Has anyone those probes (different brand but same product) and can post front and back hi-res PCB pics?These probes have beeper.Thanks in advance.
Pioneer SX-2500 schematic needed (Power supply) - Page 1
Forum section: electronics / repair

author: Excavatoree
author_rank: Frequent Contributor
timestamp: February 23, 2017, 05:34:42 pm
content: Does anyone have a schematic for the Pioneer SX-2500? I want to use the transformer but I can't figure out the primary windings. (multiple taps.) All I can find on the internet is places that will sell me a copy..(I'm not sure why I didn't try to fix it, but all I have now are the transformer, the heatsinks, and probably the capacitors, somewhere)

author: oldway
author_rank: Super Contributor
timestamp: February 24, 2017, 12:26:13 pm
content: I wonder why nobody answered....schematic is available to download for free on elektrotanya ! Too easy...https://elektrotanya.com/pioneer_sx-2500_sch.pdf/download.htmlWait some time that "processing" became "get manual".....

author: Armadillo
author_rank: Super Contributor
timestamp: February 24, 2017, 12:54:40 pm
content: I once joined elektrotanya as a member and their pre-requisite was to pass a electrical test and writing some electronic essay. I don't know if they do practised it now.But I figured the pre-requisite was their responsible way of ensuring that members will be knowledgeably safe enough to receive technical information available inside there.Please don't get me wrong. I know that all members are respectable in their own fields here. thanks.

author: Excavatoree
author_rank: Frequent Contributor
timestamp: February 24, 2017, 09:09:20 pm
content: Quote from: oldway on February 24, 2017, 12:26:13 pmAh. I didn't wait long enough when I first found that site. Not the clearest copy around, but good enough for me to see the transformer primary lead colors. Thanks.
mini female usb 2.0 troubleshoot  - Page 1
Forum section: electronics / repair

author: tenaciousturtle
author_rank: Newbie
timestamp: February 24, 2017, 04:00:01 pm
content: I have a usb mic, blue yeti, it uses the mini usb 2.0. So I cut a usb cable at the regular usb side and stuck the other end into the mic to check for continuity on the solder points of the mini usb to te board for all four wires and it read zero. So my question is, would this be the correct way to test a mini usb or was this a pointless endeavor
wandel goltermann PF 5 - Page 1
Forum section: electronics / repair

author: ooorobertoooPL
author_rank: Newbie
timestamp: February 24, 2017, 12:58:54 pm
content: PF-5 and have stopped working is dead, so I bought on ebay service manualand did not get itand seller did not respond to emails. And I question whether anyone have a diagram service ? .

author: ElektronikLabor
author_rank: Regular Contributor
timestamp: February 24, 2017, 01:44:49 pm
content: For the case you don't find any schematic:Are there any voltage rails marked on the PCB that you can check with a multimeter?How much current do the device draw when its switched on?
[FIXED] Logitech Computer Speaker System Z313: schottky diode failure - Page 1
Forum section: electronics / repair

author: sorenkir
author_rank: Regular Contributor
timestamp: February 23, 2017, 09:37:57 am
content: Hi all,I have fixed this system recently.The culprit was a schottky rectifying diode in the secondary part of the 12V SMPS.In fact there are two diodes in parallel (!), one was completly shorted. These SB5100 schottky diodes are rated 100V 5A.This failure does not seem uncommon: I have found the exact same description in TerraHertz's blog.I wonder what kind of failure mode can affect such big diodes in a small speaker system (25W output power) ?Michel.

author: Len
author_rank: Frequent Contributor
timestamp: February 24, 2017, 12:22:04 am
content: I can't answer your question, but Big Clive just posted a video showing the same problem. Last lines: "The diodes always fail in these power supplies. It's such a common fault."
Pulsetek 232 AC Calibration Source teardown and easy fix - Page 1
Forum section: electronics / repair

author: rigrunner
author_rank: Frequent Contributor
timestamp: February 22, 2017, 03:29:36 am
content: I picked up a broken Pulsetek 232 AC Calibration Source. Initially it powered on but had no output. The meter pegged hard right and the fan isn't any more.The fix was very simple. A new fan, replace an opamp and clean things up.As i can't find any internal pictures, schematic or manual for it i thought i'd take pictures and post them.

author: rigrunner
author_rank: Frequent Contributor
timestamp: February 22, 2017, 03:31:23 am
content: Under the top cover are two large transformers and enclosed shunt resistors with a cooling fan.Inside the cooled enclosure are 7 power resistors. 6 x 75R in parallel, 3 per heatsink, and one 130R in series mounted on the lower aluminium plate.

author: rigrunner
author_rank: Frequent Contributor
timestamp: February 22, 2017, 03:35:16 am
content: The function switch on the front panel is a 6 layer rotary wafer. The large blue 390K resistors seem to be switched in for the voltage ranges.Output level is controlled by 3 controls. Course is a 22 way rotary with a string of 100R. Medium and fine are single turn potentiometers.The AC frequency oscillator is inside its own aluminium box.

author: rigrunner
author_rank: Frequent Contributor
timestamp: February 22, 2017, 03:38:37 am
content: Somebody has viciously oiled the fan and the oil has made its way down to the main board.Isoprop cleaned the oil off without any trouble.Main board has Bradley electronics on it rather than Pulsetek.The TO-3 transistors on the rear heat sink are 2N3055 dated 1977.And the meter goes up to 11

author: cnqhdszq
author_rank: Regular Contributor
timestamp: February 23, 2017, 02:41:12 am
content: The photos is good,I had never seen before . What the accuracy is ? it is 40 years old now.

author: Vgkid
author_rank: Super Contributor
timestamp: February 23, 2017, 05:48:49 am
content: Interesting that it uses 22 resistors in the course adjust, instead of the expected 10(or 9).Thinking about it, I know that in audio they use 22(or is it 23) as a divider.

author: rigrunner
author_rank: Frequent Contributor
timestamp: February 23, 2017, 11:48:48 pm
content: I fired it up set it to 3V and logged some data on a 3457A to get an idea of how stable it is. (3V range is the least noisy on 3457A)Given its age and that it has single turn trimmers for adjustment i wasn't expecting much. I've nothing to compare it against AC wise but it looks better than i thought it might. The frequency was set to 50Hz on the dial and it gave 58Hz out.On the 10V scale each of the course settings should give .5V steps and they vary +/-2% or so
blue yeti usb microphone not being recognized by computer and the power light di - Page 1
Forum section: electronics / repair

author: tenaciousturtle
author_rank: Newbie
timestamp: February 23, 2017, 05:21:07 pm
content: Hello all, I have a blue yeti mini usb microphone, it has dual board, one digital board and one analog, I am trying to troubleshoot why it is not being recognized and the light super dim. But keep getting stumped I tried switching cables, tried three different computers,tried wiggling the cable around where it plugs in, then I cracked it open. I'm getting good continuity(at least I think, the blue company is very secretive about their designs so I'm just going by the status quo of the board and they all seem to match, there's not one lower than the others, minus the paths that move information instead of voltage) and I'm getting 5 volts into the board. So any help would be much appreciated.
Latching Connector, Help  Identify Please - Page 1
Forum section: electronics / repair

author: LaserSteve
author_rank: Super Contributor
timestamp: February 21, 2017, 10:16:43 pm
content: These connectors are in a high speed centrifuge at work. Please help me identify them, as they are dying from vibration damage, failing to latch and becoming intermittent. We are changing the ramp program to avoid the speed setting the students used for the past two years, which placed the motherboard at resonance. Even after adding RTV to hold them in, they still work loose, and opening the unit every two weeks, to reseat them, is becoming tedious.I Would prefer to fix this then see the taxpayer's grant money spent on a new rotor harness and motherboard (1500$)Please see attached two pics...Thanks,Steve

author: amyk
author_rank: Super Contributor
timestamp: February 22, 2017, 04:11:46 am
content: I would rather fix the resonance/vibration instead, by adding some damping or possibly rebalancing the rotor...

author: LaserSteve
author_rank: Super Contributor
timestamp: February 22, 2017, 10:37:51 am
content: Already I re-balanced the rotor in the software, it was within tolerance. I need the connector now, to maintain signal integrity without improvising or soldering the wires directly. Damping was added to the harness, as well.Thanks, Steve

author: amc184
author_rank: Regular Contributor
timestamp: February 23, 2017, 07:08:26 am
content: Looks like they're TE Connectivity RAST connectors.http://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1-1773727-3_RAST_Connector_System&DocType=CS&DocLang=EN
Flatflex repair - Page 1
Forum section: electronics / repair

author: nikgul
author_rank: Newbie
timestamp: February 22, 2017, 10:29:45 pm
content: Hi all.My first post hereI have been trying to repair a DaB radio as time permits, and I have had an accident with it, where it slipped, which resulted in the flatflex cable for the cd drive was ripped over, is there a good way to repair it, that is gonna last ?Have been thinking about replacing it with some thin coated copper wire, so that the flexibility is preserved as mutch as possible.Thanks for any input
Identify this connector - Page 1
Forum section: electronics / repair

author: Aeternam
author_rank: Unknown
timestamp: February 21, 2017, 11:48:25 am
content: Hey gang,I need help identifying this connector. The physical connector is approx. 1 cm wide and has a knurled cap for securing the plug on a panel. I'm looking for the female part. I've been googling like crazy, microphone connectors are a close fit but the pin arrangement on the ones I found won't match -- their pins are arranged in a circular manner whereas this thingie has a 2-4-3 arrangement.Any help would be greatly appreciated!

author: bitwelder
author_rank: Super Contributor
timestamp: February 21, 2017, 09:36:23 pm
content: So, something that resembles a circular connector, but with 7 pins, one in the center and 6 all round?Googling for 'circular connector 7 pins' finds a page on Mouserhttp://eu.mouser.com/Connectors/Circular-Connectors/Circular-DIN-Connectors/_/N-76q5g?P=1yzxfwnand e.g. one of the results is this one:http://eu.mouser.com/images/amphenol/lrg/abg_c091a_ks_schraub_gerade6_8mm.jpg

author: helius
author_rank: Super Contributor
timestamp: February 21, 2017, 09:56:28 pm
content: Where did the OP specify 7 pins? OP, you need to be clear about what you are looking for. How many pins? Is the diagram you showed correct? Are there any markings on the connector (inside, outside, or around it)?Ideally, post a picture.

author: Aeternam
author_rank: Unknown
timestamp: February 22, 2017, 07:19:54 am
content: Yes sorry about that helius, the cable was at home and I was at workIt's use is quite specific, it's used on a telescope mount to connect the controller board to a motor.I rechecked, and it turns out that the pinout in the diagram (copy/pasted from the owner's manual, go figure) is not correct. It's this connector:https://ae01.alicdn.com/kf/HTB1EvHjOVXXXXazaXXXq6xXFXXXH/GX16-9-Pin-Male-Female-Diameter-16mm-Wire-Panel-Connector-GX16-9-Circular-Connector-Aviation-Socket.jpg_220x220.jpgOn AliExpress a lot of vendors call it "GX16-9", "aviation plug", or XLR (the XLRs I know look different; ah well.)Anyhow, sorry for the confusion.

author: helius
author_rank: Super Contributor
timestamp: February 22, 2017, 07:59:48 am
content: OK, it looks like one of this series:https://www.eevblog.com/forum/projects/what-are-these-connectors-formally-called/They have had a lot of names, but there isn't a really satisfactory one that everyone uses. I think Aliexpress is your best shot at sourcing them.

author: Aeternam
author_rank: Unknown
timestamp: February 22, 2017, 10:19:11 am
content: Thanks for your help!
RCA cable question - Page 1
Forum section: electronics / repair

author: Stuartambient
author_rank: Regular Contributor
timestamp: February 21, 2017, 01:25:59 pm
content: I must be poor in the use of search engines because I could not find an answer, as simple as it sounds on this question.I'm splicing two rca cables together. Both have 2 wires inside the insulation, with 1 wire in another insulation. One is obviously a signal wire and one is a ground but are they always the same? In other words is the one in the insulation always the same. One cable here has a white insulation and the other one I'm splicing it to is a black insulated wire. If I spliced the wrong ones together I'm not sure if I'd get anything. This is for a video signal and right now while the image is coming through it's distorted and wavy so maybe I'm not splicing right.

author: MrBungle
author_rank: Unknown
timestamp: February 21, 2017, 01:51:28 pm
content: Yep, should always be the same.Can't you just use the continuity tester on your multimeter to check?

author: Stuartambient
author_rank: Regular Contributor
timestamp: February 21, 2017, 02:16:45 pm
content: Quote from: MrBungle on February 21, 2017, 01:51:28 pmI'm not sure about continuity meaning anything in this case. Basically I have a 2.5 TRS (or TTRS) plus which has both a red and yellow rca at the other end. I had cut off the yellow and now I've spliced on back another one. I cut off the original right at the plug so not using the original. There is a signal coming through but it's not right, wavy and distorted so I thought maybe I have the wires spliced incorrectly. I'll be able to do more debugging later today. It might be my monitor or the cable.

author: Ian.M
author_rank: Super Contributor
timestamp: February 21, 2017, 02:25:22 pm
content: Be suspicious of Phono (RCA) cables with black inner 'insulation' Its often a conductive plastic layer over the real insulation, and is intended to provide improved screening (in conjunction with an outer braid) and attenuate HF interference. Phono cables with a conductive plastic layer typically are for audio use only and severely attenuate and distort video signals.

author: Armadillo
author_rank: Super Contributor
timestamp: February 21, 2017, 02:28:14 pm
content: recommended video;

author: MrBungle
author_rank: Unknown
timestamp: February 21, 2017, 03:23:44 pm
content: Quote from: Stuartambient on February 21, 2017, 02:16:45 pmContinuity will help determining if you have a swap, if it's TRS, then the 'S' should be connected to the RCA rings, if it's a TRRS then it will be the second ring from the tip. Any other way and you have a cross/swap (or it's a mongrel cable)

author: grifftech
author_rank: Frequent Contributor
timestamp: February 21, 2017, 04:05:43 pm
content: buy a longer cable

author: Stuartambient
author_rank: Regular Contributor
timestamp: February 21, 2017, 06:43:10 pm
content: Anyway, I had a chance to test the spliced cable on a better monitor and video signal is great so the splice was correct. Now I just need a better monitor.
Is it possible to modify TC Nove System to Work with 4cable method ?  - Page 1
Forum section: electronics / repair

author: fenderender
author_rank: Newbie
timestamp: February 21, 2017, 10:09:09 am
content: Hello guys, I'm after modifying a TC Nova System.I think it can be possible to break the link between analog drive part and digital effetc and adding a send and a return jackin between. Anybody did this before ?

author: obiwanjacobi
author_rank: Super Contributor
timestamp: February 21, 2017, 11:46:49 am
content: I think so - though I have not done it.J2 holds the analog signals if I remember correctly. I believe a dry and wet signal is available there.Put an audio signal into the unit and probe J2. Volume and Gain are done on the board, Tone and Boost are done on the main board digtally...Hope it helps.
Possible to repair a modern Xeon CPU? - Page 1
Forum section: electronics / repair

author: TheAmmoniacal
author_rank: Unknown
timestamp: February 23, 2017, 03:14:34 pm
content: Story short.. Got scammed online, so now I'm left with an empty wallet and a DOA Xeon. My PC will boot with it in the socket, and I can get into the UEFI/BIOS and see the specifications, core count, clock speeds, cache etc. But that's as far as it goes, the PC will restart just after POST (will not boot into the OS, or even start to load it), and when booting from USB/external drive it just freezes.The CPU is a bit beat up, as you can see in the first picture - nicks, dents and scratches - which devil would do such a thing?!?! Two potential issues after examining the CPU under my crappy USB microscope:1. Could those traces be torn/open? Anyone know what are are for? Decoupling?2. Could the pins in my socket not make proper contact with either or those two pads?How would I even go about fixing something like this? It's tiny, and my crappy microscope is of no help.. Anyone know if the pinout is available for these things?

author: RGB255_0_0
author_rank: Frequent Contributor
timestamp: February 23, 2017, 03:25:27 pm
content: I wouldn't spend too much time on it. I'd try and repair the big scratches to the LGA contacts with a little solder as they're likely not making proper contact to the socket pins. Hopefully that middle scratch is just skin deep on the substrate.

author: CraigHB
author_rank: Regular Contributor
timestamp: February 23, 2017, 04:35:02 pm
content: Quote from: TheAmmoniacal on February 23, 2017, 03:14:34 pmI picked up a Zeon processor for an LGA771 to LGA775 conversion to breath some life into an old PC. It's a conversion people have done commonly, but there are some minor differences in the pin-out and wanted to verify there wouldn't be a problem. I was able to download data sheets from Intel for the LGA771 and LGA775 parts to check pin functions. A good number of the pins are just power and ground. Not sure on the newer ones if they post data sheets or not, but it's worth a look.
Identify this diode please - Page 1
Forum section: electronics / repair

author: 4cx10000
author_rank: Regular Contributor
timestamp: February 20, 2017, 08:33:59 pm
content: Hi!I am about to repair a Self-levelling front axle suspension controller. On the pcb there are two shorted diodes - plus a few other blown components - and I can not find them on the web. Picture is taken with my phone trough the eyepiece of a microscope, you bet I had a hard time to fine tune the angle of the camera...The package, which can not be seen in my photo, is a DO-201AD. The outline dimensions are: dia. 0.210 (5.3) and length of body 0.375 (9.5).Any clue?Thanks in advance

author: hdj80r
author_rank: Newbie
timestamp: February 20, 2017, 09:44:46 pm
content: P6KE TVS Diode ?http://au.element14.com/littelfuse/p6ke18a/tvs-diode-600w-15-3v-unidir-do/dp/2679592David

author: JFJ
author_rank: Regular Contributor
timestamp: February 20, 2017, 10:10:51 pm
content: The 'KE18A' indicates that the component is an 18 volt unidirectional TVS (Transient Voltage Suppressor) diode, and the package dimensions are consistent with one capable of handling 1500W peak pulse power. Hence, the generic part number would be '1.5KE18A'.A number of different semiconductor manufacturers produce those diodes:http://uk.farnell.com/webapp/wcs/stores/servlet/Search?catalogId=15001&langId=44&storeId=10151&st=1.5KE18A...

author: 4cx10000
author_rank: Regular Contributor
timestamp: February 21, 2017, 09:55:21 am
content: Thanks a lot David and JFJ!Yupp! This clear things up and it is then, most probably, a TVS. I had a closer look at the PCB and these two TVS clamps both feeds on the board. One is continuous, battery voltage, and the second from the ignition (15) so of course it is an effective protection. The other components - High side Power Switch BTS612N1 controlling the hydraulic valves and a capacitor - where thankfully quiet easily found.Thanks again to you both!!Bjorn
Feet SONY-TEK 314A - Page 1
Forum section: electronics / repair

author: frantisek
author_rank: Regular Contributor
timestamp: February 21, 2017, 09:28:54 am
content: Greetings! It would be interested feet on SONY TEKTRONIX 314A-number 348-0425-00? These are products production. The approximate price of $ 5 per piece + postage.
About using an oscilloscope - Page 1
Forum section: electronics / repair

author: asliyucegsm
author_rank: Contributor
timestamp: February 20, 2017, 12:26:51 pm
content: my friendFriends I would like to get information about the oscilloscope settings to get the signals with this oscilloscope.labtop repairrigol ds1054zthanks

author: ataradov
author_rank: Super Contributor
timestamp: February 20, 2017, 05:32:40 pm
content: What specifically about those signals you want to know? It is an I2C interface, so if you want to see the exchange, then setup I2C decoding.But it is not a flash, this is a 512-byte EEPROM, it probably stores settings for the BIOS, if it is in the BIOS area.

author: xrunner
author_rank: Super Contributor
timestamp: February 21, 2017, 01:19:59 am
content: Yea, like the previous post shows use Auto. or if you want to use knobs , just hook onto the line and adjust vertical and horizontal till you see signals ...

author: asliyucegsm
author_rank: Contributor
timestamp: February 21, 2017, 07:55:21 am
content: thank you friends

author: Armadillo
author_rank: Super Contributor
timestamp: February 21, 2017, 08:25:59 am
content: I think this scope has logic analyser capability. If you want to see the clk and data and protocol stuff, you should use the logic analyser to do it [As ataradov has hinted to you on I2C decoding]But note that since it is a EEPROM, the signal will only be available depending on the user action example storing or retrieving data. The signal may not always be there or is addressed to this chip. Hope you understand.However, if you just want to confirm signals are exchanged, use 2 probes, one on Channel 1 to the clk and Trigger on it, and one on Channel 2 to the data line. The 2 crocodile clips referenced to the ground. Or will just 1 probe, visualize the signal health will be enough for you?So I think the proper way is to use the scope logic analyser capability to confirm its addressing to the chip, specifically.
Looking for help with a GOS-6112 - Page 1
Forum section: electronics / repair

author: JDarcade
author_rank: Newbie
timestamp: February 15, 2017, 04:36:33 pm
content: I just got this oscilloscope from eBay. My first ever I'm working on getting into arcade PCB repair or at least keep my arcade games working.But now my problem is I was trying to test it out and now channel one is off the screen and can't bring it down.And I can't move the scope back to the left so it's really small to the left. (Channel two)Is there some adjustment inside or is this scope junk? At least I can kinda use it.Here's a full view of the front. When I turn Horizontal position knob it just beeps at me.Any help would be great thanks.Sent from my iPhone using Tapatalk

author: singapol
author_rank: Frequent Contributor
timestamp: February 17, 2017, 03:05:55 pm
content: Read the GOS6112 user manual first...https://www.artisantg.com/info/PDF__496E7374656B5F474F535F363131325F4D616E75616C.pdf

author: chihaxinh
author_rank: Regular Contributor
timestamp: February 21, 2017, 01:49:04 am
content: Hi JDarcadeGOS all seri don't public service manual , only public user guide and Block Diagram. You can see OSC like old model off iwatsu , have MCU to process digital function like readout and measurement VOL and Time.You cant isolate function and check . But allway check PSU first , OSC model like have 2 PSU , one LV and HV for CRT tube. Becarefuly High Voltage.
Nordmende LCD-TV - defective SMPS (JSK4180-024/A/B) - Page 1
Forum section: electronics / repair

author: carl_lab
author_rank: Frequent Contributor
timestamp: February 19, 2017, 01:04:22 pm
content: Nordmende TV N3202LBD doesn't switch on from standby.Standby LED turns from red to blue, but LCD panel doesn't light.SMPS output "5VSB" (standby supply) is OK (=5V).SMPS control input "ON/OFF" is 0V on standby and 2.2V on operation mode, but doesn't switch main PS on (12V and 24V).Then I disconnected "ON/OFF" line from control PCB to power supply.On controller side it is now 4.8V in operation mode. I'm not sure 2.2V under load is enough to switch the main PS on.(PS: it's enough!)Maybe "ON/OFF" input is somehow shorted and pulls 4.8V from controller PCB down to 2.2V?On optical inspection I could not find any suspicious components.So I must find schematics of this SMPS "JSK4180-024/A/B"...

author: carl_lab
author_rank: Frequent Contributor
timestamp: February 19, 2017, 08:25:10 pm
content: The trick was, not to search by google web search but search forpictures!I found this one athttps://de.scribd.com/doc/208538169/JSK4180-024A-SCH.At the picture, text is nearly unreadable, but schematic is quite usable ...Finally I found a way to download a very well readable (zoomable) PDF!

author: carl_lab
author_rank: Frequent Contributor
timestamp: February 19, 2017, 11:38:20 pm
content: Problem solved:Optocoupler IC2 (PC817) was defective.So switching on the 12V+24V main supply was impossible.

author: dav
author_rank: Regular Contributor
timestamp: February 20, 2017, 01:03:59 pm
content: Could you detail the 817 defect? (LED shorted, 817 partially working but uncalibrated...)

author: carl_lab
author_rank: Frequent Contributor
timestamp: February 20, 2017, 03:30:19 pm
content: LED is OK. Phototransistor does not conduct.I replaced old one by a new optocoupler, which works, so root cause doesn't really matter for me.
Intel chip - Page 1
Forum section: electronics / repair

author: IgorSMPS
author_rank: Newbie
timestamp: February 20, 2017, 02:55:51 pm
content: Hello!!!Can you please help me with finding the datasheet of the intel chip on the picture below.I was looking on the google, but i cant find anything... Do you have any idea?The unknown chip is red circleIntel 8493087 - 7854 - PI 866 397 - 8018 CAThanks.Best Regards.

author: David Hess
author_rank: Super Contributor
timestamp: February 20, 2017, 03:27:34 pm
content: Given its location I would suspect a clock generator but it would help to see the ICs around it.

author: IgorSMPS
author_rank: Newbie
timestamp: February 20, 2017, 03:29:56 pm
content: Thanks !!!! i got it !!!http://ece-research.unm.edu/jimp/310/slides/8086_chipset-7.gifCopied fromhttp://ece-research.unm.edu/jimp/310/slides/8086_chipset.html