hybridfree/eevblog-posts huggingface dataset:
Need help with Russian RF connectors - Page 1
Forum section: electronics / repair

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: June 09, 2019, 03:08:05 am
content: Hi,Working on a Russian piece of equipment. It has the connector type pictured on many modules.Does anyone have a spare cable or two that mates with them that I can buy to cut up and make adaptor cables to BNC or SMA?Cheers,Corby

author: TheSteve
author_rank: Unknown
timestamp: June 09, 2019, 05:15:41 am
content: A new toy, perhaps a maser?

author: Theboel
author_rank: Frequent Contributor
timestamp: June 09, 2019, 06:02:09 am
content: is that female TNC ?

author: vk6zgo
author_rank: Super Contributor
timestamp: June 09, 2019, 10:03:15 am
content: The Russkis sometimes used earlier DIN type connectors, so it may be worth looking at some older German information.Unfortunately, it seems that many such DIN types have been discontinued, so that may also be a dead end.

author: wraper
author_rank: Unknown
timestamp: June 09, 2019, 10:33:47 am
content: Looks like a little bit non standard N connector but I think is should mate with usual ones just fine.

author: awallin
author_rank: Frequent Contributor
timestamp: June 09, 2019, 12:21:55 pm
content: Quote from: 5065AGuru on June 09, 2019, 03:08:05 amThe older Kvarz masers have, I think, something called "SR-50" connectors.the connector that goes on the cable is possibly this one:https://www.ebay.com/itm/50-OHMS-LOT-OF-1-SR-50-155FV-50-155-CONNECTOR-FOR-REV-16-REW-16-4mm-/282729664493You could ask Kvarz or Vremya directly - if you need 5-10 or so the price might not be that bad.

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: June 09, 2019, 03:06:32 pm
content: It's a tiny one. about the diameter of an SMA but very fine threads only on the front third. The ebay ones mentioned are not the kind I need..Thanks,Corby

author: dacman
author_rank: Frequent Contributor
timestamp: June 09, 2019, 07:37:34 pm
content: Do you have a thread gauge and a micrometer and could you post the major thread diameter and thread pitch?

author: Bud
author_rank: Super Contributor
timestamp: June 09, 2019, 11:00:55 pm
content: Is that the one?http://altynpro.ru/item/78088https://sr-neywa.ru/catalogue/show/vilka-kabelnaya-sr-50-108fv-vr0-364-026-tu/
Need help with YIG Oscillator output purity - Page 1
Forum section: electronics / repair

author: induzer
author_rank: Contributor
timestamp: August 19, 2019, 07:16:12 am
content: Hi,after I got the 2nd LO of my R&S FSA fixed now, me found a further issue.If the span is >= 5MHz everything is just fine. (see upper part of 1st diagramm)But if i set it right to 4,9999 MHz width, i get some peaks at the lower end of the spectrum between 100Hz to 4,9985 MHz.The peaks show up at 87,9 kHz / 175,8 kHz and 263,7 kHz. (see lower part of 1st diagramm)I was able to determine the signal from the YIG-oscillator to get "dirty" when you set a span lower 5 MHz.The dirty signalSweep cleanSweep dirtyI have been thinking about this for 2 weeks now and I am a bit to lazy to check the 5 modules involved in the control loop.Could it be a mixing product of the mixer right to the YIG ?Or may the multiplier have spectral purity issues ?Maybe someone knows which module could NOT be the source of the "noise" ....hack on,induzer
Need HP 437B front connector pinout. - Page 1
Forum section: electronics / repair

author: essem54
author_rank: Newbie
timestamp: July 15, 2019, 09:35:15 am
content: Hi.I need the pinout for the 12 pin front connector power sensor for my HP 437B, which wire color to which pin (A,B,C,D,E,F,G,H,J,K,L,M).Thanks in forecast for any valuable informations.Regards essem54.

author: rf+tech
author_rank: Frequent Contributor
timestamp: July 15, 2019, 10:38:45 pm
content: Hello essem54,The connections are likely to be the same as on the HP 435.The HP 435 service manual can be downloaded from Electrotanya:https://elektrotanya.com/hp-435b_00435-90040_power_meter_sm.pdf/download.htmlThe attached file is page 83, from this manual, and shows the wire numbers. The wire numbers follow the resistor color code, such that wire 904 will be white, black, yellow.Best regards,RF+ Tech

author: essem54
author_rank: Newbie
timestamp: July 16, 2019, 08:21:33 am
content: Hi.Thanks for your research but unfortunately seems HP doesn't keep the same color code from 435 to 437B.All wire are single color and I have a grey wire and a violet wire, this two wire color are not used in the 435 (to be seen in attachement).Need the same doc but for the 473B.But tnx again for your help and regards.essem54.

author: rf+tech
author_rank: Frequent Contributor
timestamp: July 16, 2019, 09:21:37 pm
content: As far as I know, both power meters use the same series of sensors. At the meter end, only seven conductors are required.The "extra" wires are likely paralleled and used as guard connections, as shown in the 435 schematic.Studying some sensor schematics may provide more details.RF+ Tech

author: essem54
author_rank: Newbie
timestamp: July 17, 2019, 07:34:12 am
content: Tnx for additional info and advice, i will carefully open the sensor and hope to solve my problem, just found that there are at least 2 differents power sensor PCB and that the white and yellow wire are inverted depending on the PCB used, funny HP.Not too far away from buying a Siglent SSA 3021X to make my RF power measurement.Regards essem.

author: MarkL
author_rank: Unknown
timestamp: July 17, 2019, 10:13:07 pm
content: Sensor schematic in this doc (page 1-15):http://literature.cdn.keysight.com/litweb/pdf/08481-90049.pdfTony_G has done a teardown of a 437B with high res photos here:https://www.eevblog.com/forum/testgear/hp-43x-series-power-meters-a-progression-teardown/msg892876/#msg892876But it unfortunately doesn't show enough detail on J4 to the front panel. Maybe you could ask him to send you a more detailed photo of that area.The document above describes the sensor disassembly procedure, but I wouldn't open it unless absolutely necessary.It also looks like there are printed 437B service manuals on ebay, but verify it has the schematic before purchasing.

author: essem54
author_rank: Newbie
timestamp: July 18, 2019, 07:47:37 pm
content: Thanks for informations.I send PM to Tony_G, wait and see.No schematic within the original service manual, I already own.Thanks again:essem54
Need identify Coil, transformer or flyback converter of VFC Board Futaba - Page 1
Forum section: electronics / repair

author: Rogervar
author_rank: Newbie
timestamp: November 17, 2021, 03:14:26 pm
content: Hi,i Need some help to identify the flyback converter of Apexi AFC board (flyback converter (T1, 440 YX), it´s from a Futaba VFD) with a broken transformer or coil, this one has the number 440 YX. If you can help me with replacement information, I would appreciate it very much.ThanksRoger
Need identify Coil, transformer or flyback converter ... - Page 1
Forum section: electronics / repair

author: JuergenB52
author_rank: Contributor
timestamp: February 15, 2018, 08:55:28 pm
content: Hi,i Need some help to identify the flyback converter (T1, 215 YE or 215 YE), it´s from an old Futaba VFD (Zoom 9050).It´s providing the power for the VFD, must be 5V and 30V, i am able to do some continuity test with my meter.I have continuity from 1-3, 2-4, 4-5 and 6-9 (1 at the top left, arroy 6 where it says Q2).Strange thing is the measurement for pin 7 (over text Q2), this one has no other continuity with (215YU).Pin 7 is connected to D1 (1SS187).ThanksJürgen

author: helius
author_rank: Super Contributor
timestamp: February 15, 2018, 10:15:21 pm
content: I'd look at EPCOS transformers with "215" in the code, like the B82802A12A215 might be a possibility. Check the dimensions.

author: floobydust
author_rank: Super Contributor
timestamp: February 16, 2018, 02:26:27 am
content: It's going to be very hard to find- I would look at other Futaba 20x2 VFD modules and buy one for the parts or a new display entirely. They have the same commands.M202SD01L also used on Lexicon PCM. Would a newM202SD2xAAwork?Open transformer this small is usually a cold solder joint or corrosion where the magnet wire attaches to the pins. The 30V winding is fine wire.I find Japanese displays use components from other Japanese manufacturers. I would guess it's an old TDK or Murata transformer, but they no seem to no longer offer VFD inverter transformers like DCT20EFD-UxxSOA5 inMaxim Reference Design 4363.Noritake would probably use TDK parts as well.

author: Rogervar
author_rank: Newbie
timestamp: November 17, 2021, 04:27:39 am
content: I also have an Apexi AFC (flyback converter (T1, 440 YX), it´s from a Futaba VFD) with a broken transformer or coil, but this one has the number 440 YX. If you can help me with replacement information, I would appreciate it very much.
Need Kikusui COS5100 full Service Manual w/schematics - Page 1
Forum section: electronics / repair

author: scopeman
author_rank: Frequent Contributor
timestamp: February 21, 2020, 04:14:23 am
content: I am looking for the complete service manual with schematics for theKikusui COS5100 100MHz Analog Oscilloscope. All of the ones that I have found on linedo not include the schematics.I sent an email to Kikusui a few weeks ago but never got a response.Thank you,SamW3OHM

author: SMdude
author_rank: Frequent Contributor
timestamp: February 21, 2020, 07:11:26 am
content: I have the old paper copy and can take some decent photos of the schematics and put them up hereDo the online ones have the parts identification tables?cheers

author: SMdude
author_rank: Frequent Contributor
timestamp: February 21, 2020, 08:21:38 am
content: The first 3 schematic pages...

author: SMdude
author_rank: Frequent Contributor
timestamp: February 21, 2020, 08:23:01 am
content: And the next

author: SMdude
author_rank: Frequent Contributor
timestamp: February 21, 2020, 08:24:16 am
content: next, sorry the files are too large to post all together

author: SMdude
author_rank: Frequent Contributor
timestamp: February 21, 2020, 08:25:15 am
content: next!

author: SMdude
author_rank: Frequent Contributor
timestamp: February 21, 2020, 08:30:50 am
content: There you go!

author: scopeman
author_rank: Frequent Contributor
timestamp: February 22, 2020, 09:24:47 pm
content: WowThanks MuchSamW3OHMOwner and Moderator ofLeCroyOwnersGroup on groups.io(Formerly on Yahoo! - The Yahoo! Group is dead RIP)

author: scopeman
author_rank: Frequent Contributor
timestamp: February 22, 2020, 09:32:44 pm
content: If you ever get access to a full page scanner (some office supply stores have them) and are able to scan the full manual I am sure thatmanual sites likewww.ko4bb.comwould be glad to host it. That is what I have done with dozens of LeCroy manuals.As many of these Kikusui 100MHz scopes are around I am surprised how hard it is to find manuals for them.In any event it looks like I have another scope to fix.73,SamW3OHM

author: Unica_Research
author_rank: Contributor
timestamp: March 04, 2021, 07:37:07 am
content: thanks so much, I'm looking for schematic of this COS5100 oscilloscope too.
Need LED for pioneer cassette deck CT-F950 - Page 1
Forum section: electronics / repair

author: Bargainhunter
author_rank: Regular Contributor
timestamp: June 12, 2024, 02:33:07 pm
content: I am looking for a special LED indicator light used on a Pioneer CT-F950 cassette deck.It is odd shaped. 4.75mm round then near the tip becomes 2.22mm round for the legnth of 3.75mm.Does anyone know where to find one or how to make or modify a green LED?Thank you,Chuck

author: coromonadalix
author_rank: Super Contributor
timestamp: June 12, 2024, 03:36:32 pm
content: i would say try an 3 mm green led and adapt the front panel hole2 mm ledshttps://www.ebay.ca/itm/222576684771https://www.aliexpress.com/item/1005004552069474.htmlhttps://www.ebay.ca/itm/222731390901sure some have huge qty loll

author: Bargainhunter
author_rank: Regular Contributor
timestamp: June 13, 2024, 05:57:21 pm
content: Thank you all for your help.Someone sent me a link to Newark electronics. They show the exact LED made by Multicomp. It's a tower LED and ships from England.

author: mariush
author_rank: Super Contributor
timestamp: June 13, 2024, 06:22:52 pm
content: If that falls through, tme.eu (ships from Poland) has some that are similar (but not round) :https://www.tme.eu/gb/details/osg5ta7k94b/tht-leds-others/optosupply/https://www.tme.eu/gb/details/103sygd_s530-e2/tht-leds-round/everlight/https://www.tme.eu/gb/details/ll-204gd1f-1b/tht-leds-round/luckylight/

author: enut11
author_rank: Super Contributor
timestamp: June 13, 2024, 11:59:16 pm
content: When all else fails, I leave the failed LED in place and cut off the leads. I then mount a white LED directly behind so it shines through the original LED. Works.

author: Bargainhunter
author_rank: Regular Contributor
timestamp: April 29, 2025, 03:48:34 pm
content: Thank you for your help.
Need photos of Tek 1000/2000 Series power supply - Page 1
Forum section: electronics / repair

author: jogri
author_rank: Frequent Contributor
timestamp: October 11, 2019, 02:14:25 pm
content: I am currently repairing a Tektronix TDS 1002C that has a bad power supply (bought it broken) and i need photos of the control IC (the one with the heatsink and the label "U1") (part number + orientation of the pins). It looks like this chip blew out (there are traces of brown gunk on the heatsink) and someone tried to fix it (badly). Some pads are missing and i am not sure if that person installed the right IC (right now it's a TOP244YN) and in the correct orientation, so i would appreciate if someone could send me pictures of a working board.The board is an Emerson 7001574-J100 Rev 1H, and it looks like Tektronix installed that board on the TDS 1000 and 2000 series.
Need recommendation for AVR’s memory capacitor replacement  - Page 1
Forum section: electronics / repair

author: g.costanza
author_rank: Contributor
timestamp: August 17, 2024, 06:53:15 pm
content: Picked up a very nice Harman Kardon AVR110 surround sound receiver for $10. Has common issue of bad memory capacitor. All settings are lost if power is cut. Can someone recommend an inexpensive replacement, shipped to Georgia, USA? I’d hate to spend $10 on a part for a $10 device. Lol. Does it have to be the same type? I do have some old circuit boards from other amps etc I’m also going to scrounge through to see if they have the part. Thanks!

author: wasedadoc
author_rank: Super Contributor
timestamp: August 17, 2024, 09:57:49 pm
content: Just about any 5.5 volt 0.047F (or more) supercap should be OK

author: coromonadalix
author_rank: Super Contributor
timestamp: August 18, 2024, 01:54:10 am
content: yep same tought ...https://www.alibaba.com/showroom/super-capacitor-0.47f.html

author: Psi
author_rank: Super Contributor
timestamp: August 18, 2024, 02:21:45 am
content: Anywhere official is going to be like $3 + shipping.Aliexpress is probably your best bet for ultra cheap options with free shipping. But quality might not be the best
Need repair shop for Agilent 4287A - Page 1
Forum section: electronics / repair

author: babazaroni
author_rank: Newbie
timestamp: July 13, 2024, 06:10:17 pm
content: Hello eevblogers, I have an Agilent 4287a (Serial prefix MY433) that will not finish rebooting. Partway thru the boot process, it will start again.I have taken off the cover, blown out the dust, reset connectors and even replaced the DRAM with no improvement.Is there a repair shop for this device in the San Francisco Bay area? Or I could ship it elsewhere.Thanks for any ideas.
Need Replacement Potentiometers - Page 1
Forum section: electronics / repair

author: paul_g_787
author_rank: Frequent Contributor
timestamp: January 09, 2020, 07:45:56 pm
content: Does anyone in the UK here have 5k A (Logarithmic) Audio pots? Or know where I can get some? They are the PCB mount type. (See Photo).I need to replace 2 in an amplifier as they are damaged, but CPC or eBay do not have the value I need, only 10k

author: andy3055
author_rank: Super Contributor
timestamp: January 09, 2020, 09:03:31 pm
content: Try Mouser or Digikey.

author: LateLesley
author_rank: Frequent Contributor
timestamp: January 09, 2020, 10:18:36 pm
content: https://www.ebay.co.uk/itm/5-x-5K-Log-Logarithmic-Splined-Potentiometer-Pot/252483665839?epid=1478782301&hash=item3ac932ffaf:g:sGYAAOSwKIpV-dU4

author: james_s
author_rank: Super Contributor
timestamp: January 09, 2020, 11:33:29 pm
content: In a pinch you can also put a resistor across two pins of a linear pot to get something pretty close to logarithmic. If you plot the curve of a real audio taper pot it's usually pretty ugly and only vaguely logarithmic anyway.

author: paul_g_787
author_rank: Frequent Contributor
timestamp: January 10, 2020, 02:14:23 pm
content: Quote from: LateLesley on January 09, 2020, 10:18:36 pmHi. Thanks for the link. Unfortunately I need 20mm shafts to fit the original knobs back on and these are 16. I had come across that listing already.Probably should have put that in OP.

author: paul_g_787
author_rank: Frequent Contributor
timestamp: January 10, 2020, 02:41:01 pm
content: Quote from: james_s on January 09, 2020, 11:33:29 pmThat is a good idea! I have researched what you said and I see exactly what you mean. You have given me a slightly different idea though.As I stated, I am able to get 10kA Log pots that are exactly the right size and shape. Just double the value I need.And I know that 2x 10k resistors in parallel equals 5kCould I put a 10k passive resistor in parallel with the outside pins of a 10k log pot and it still operate as a log pot?

author: SeanB
author_rank: Super Contributor
timestamp: January 10, 2020, 07:08:34 pm
content: 5k, 10k, in an amplifier as volume control it really does not matter that the resistance is double, it will make little difference, as source will not mind, and the input to the amplifieris going to be so much higher anyway.. in a tone control yes it will make a difference, so there you probably want to have the extra resistor across the outer terminals, and accept that there will be differences in the value between the wiper of the 2 variants.

author: james_s
author_rank: Super Contributor
timestamp: January 11, 2020, 01:12:14 am
content: Play around with it and see how whatever you're thinking of trying behaves. You could use a real breadboard and multimeter if you want, or just simulate it with something like thishttps://www.falstad.com/circuit/

author: mikerj
author_rank: Super Contributor
timestamp: January 11, 2020, 03:55:43 pm
content: Bournes 5k A2 taper, 20mm splined shaftDatasheet.
need replacement telescopic antenna - Page 1
Forum section: electronics / repair

author: Terry Bites
author_rank: Super Contributor
timestamp: December 09, 2021, 03:37:43 pm
content: I recently had a telescopic antenna shear off at the hinge. I've searched everywhere for months now. The full length is a metre. Anywhere near will do.I cant find one with the base diameter. Any ideas welcome:

author: bob91343
author_rank: Super Contributor
timestamp: December 09, 2021, 06:26:14 pm
content: You need to cannibalize an old boom box. My local electronics guy (of the old days) had a nice stock of those. I may have one or two laying around, not sure of the the size.
Need RFL 750 Gaussmeter schematic - Page 1
Forum section: electronics / repair

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: October 08, 2024, 05:12:37 pm
content: Hi, I'm working on an RFL 750 Gaussmeter. It is the early version with the battery compartment at the rear of the unit. When I power it up with AC supply selected I get no meter indication at all even when twiddling the pots on the front panel. I checked the power supply, it is a simple zener regulated supply at 19VDC and that checks good. Also checked the meter movement and it is also good. I need a schematic to figure out whats going on! Also wonder what batteries it used. There are three holders for cylindrical batteries in series and my guess that the batteries would be 6 volt units but can't what vintage battery was used.Cheers,Corby

author: stevopedia
author_rank: Contributor
timestamp: October 08, 2024, 06:23:53 pm
content: Unfortunately RFL seems to be a very poorly-remembered manufacturer, in spite of the high quality and specialized nature of their instruments.Magnetic Instrumentation (https://maginst.com/) wound up with RFL's gaussmeter line at some point. The only reason I know that is because we have (had?) some 912s at work that are marked RFL, and some marked Magnetic Instrumentation. I sent them a polite email asking for documentation and they sent me a scan of the operating manual and schematics. It may have helped that I wrote from my work email address. Either way, it can't hurt to askThey apparently still offer new probes for models 750A and 750D, by the way!
Need Sanyo Denki manual for PZ0A030A servo amplifier - Page 1
Forum section: electronics / repair

author: jmelson
author_rank: Super Contributor
timestamp: March 05, 2022, 03:35:53 am
content: Hello,My Quad QSA30A pick and place machine would not fire up today, and it appears a servo amplfier has a problem.It is a PZ0A030AN61PA2 from the BL Super line. It has a single 7-segment LED for status, and the normal state has it rippling one lighted segment through all segments. This amp now shows 3 horizontal bars (top middle and bottom LED segment are lit.) That is not in the legend label on the amp so I have no idea what that means. I have ended up buying a replacment servo amp, but I am not 100% sure the amp is at fault. Possibly it is indicating a motor or encoder fault.I have dug around on the net, but I can't find a user's manual for this series of servo amp. Anybody know of a good stash of older Sanyo Denki manuals? This machine was built in about 2000.Thanks,Jon
Need schematcis for LeCroy 8901A GPIB-CAMAC crate controller - Page 1
Forum section: electronics / repair

author: jmelson
author_rank: Super Contributor
timestamp: August 19, 2025, 04:33:13 pm
content: Hello,Does anybody have schematics for a LeCroy 8901A CAMAC crate controller? We have one that apparently is malfunctioning.Thanks much!Jon

author: Dougmc
author_rank: Contributor
timestamp: August 20, 2025, 01:35:32 am
content: Tryhttps://groups.io/g/LeCroyOwnersGroup
Need schematic for Samsung SFA-410ED camera - Page 1
Forum section: electronics / repair

author: jmelson
author_rank: Super Contributor
timestamp: September 12, 2020, 02:23:51 am
content: Hello,I am repairing a Quad/Samsung QSA-30A P&P machine, and the downward vision camera had developed a problem. Apparently it is supposed to lock to an external sync source, but it stopped syncing. I can see an image rolling horizontally on the vision screen.I traced the external sync back into the camera, it goes to a trace and then a via on a 4-layer board at the back of the camera, and then doesn't come out anywhere. I'm guessing a trace or via has gone open on the rear connector board. This looks like it could be a really easy fix if I only knew where that trace was supposed to go. but, the connector board is soldered to 3 multi-pin connectors, so it is hard to examine the underside of the board. Some secret stash of schematics would make this an easy fix.This is a 20 year old camera, and I have had no luck finding any info. There are some units for sale on eBay, but no manuals or other docs.Thanks,Jon
Need schematic or Cap values for Radioshack DMM - Page 1
Forum section: electronics / repair

author: DarkKnight
author_rank: Newbie
timestamp: March 30, 2022, 10:07:25 pm
content: I have an old Radioshack DMM 2200087 that I'm somewhat attached to. Recently it started acting up, and it looks like about half of the SMD capacitors are bad reading either OL or nothing at all. I cannot read any text on them. I was hoping someone had a schematic or other way to determine what the original values of these caps were so I can get them replaced. If anyone has a functional one and wouldn't mind opening it up to determine what the cap values are that I'm missing, I'd appreciate it.Here's what I have:C1 badC2 118nfC3 28nfC4 33nfC5 93nfC6 BadC7 BadC6 ? // Unable to findC9 badC10 badC11 BadC12 94nfC13 .722uFC14 2.2ufC15 badC16 badC17 ? // Unable to findC18 NCC19 NCC20 ? // Unable to findC21 NC

author: MLXXXp
author_rank: Frequent Contributor
timestamp: March 31, 2022, 06:18:14 pm
content: Are you trying to read the values of the capacitors "in circuit" (without removing and isolating them)? If so, you could be reading incorrect values and some or all of the ones you say are bad may actually be good.

author: floobydust
author_rank: Super Contributor
timestamp: March 31, 2022, 06:49:24 pm
content: You've got a bad model number, it should be Micronta 22-xxx, post a picture. Second, your capacitor tests are likely wrong, how do all those caps just go bad? The multimeter's problem is likely something else.

author: MLXXXp
author_rank: Frequent Contributor
timestamp: March 31, 2022, 06:52:29 pm
content: Quote from: floobydust on March 31, 2022, 06:49:24 pmNo, that model does exist.https://www.scribd.com/document/378935703/Radioshack-2200087-DMM-user-manual-guide-pdf

author: fzabkar
author_rank: Super Contributor
timestamp: March 31, 2022, 10:03:51 pm
content: Here it is (22-087):https://radioshack.eg/en/radioshack-true-rms-46-range-digital-multimeter-22-087Python Package to interface with Radio Shack's 2200087 Multimeter:https://readthedocs.org/projects/driver2200087/downloads/pdf/latest/

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 01, 2022, 12:17:51 pm
content: Anyone know who the OEM is? (I haven't searched.)Of course I agree with what others have said on the SMD capacitors...What exactly is "acting up"? Has it been misused? If not, did the problem show-up suddenly? After a long time without use?My usual starting points on a handheld DMM are checking for battery leakage contamination and dirty switch contacts.
Need schematic/repair manual for CRAFTSMAN 82320 DMM - Page 1
Forum section: electronics / repair

author: Chrigel
author_rank: Newbie
timestamp: January 18, 2023, 03:00:02 am
content: The CRAFTSMAN 82320 is a SEARS rebranded DMM with analog indicator that is manufactured by MASTECH as sold as the '9700' - it was really useful until it started "misbehaving":For a time the DMM part was ok but analog meter rests at 45 uA (=45% FS) for all ranges, then DMM developed a bias of 450mV. The came more erratic behaviors on various ranges, no resistance measurements.The reference votage of the LM385-1.2V is 450mV - obviously incorrect.The CA3130 drives a full phase rectifier but it it not directly connected to the analog display.I don't have a clue how the 100uA analog meter is driven (off the resitance cascade or with a DAC if it has one?)The actual DMM circuit is under an epoxy blob, (probably a 7106) but I don't know which would be pin 31 to check the analog input (200mV)Any help including cicuit drawing, calibration procedure, repair manual, youtube video or other miracles would be greatly appreciated.Best,Chrigel
(Solved) Need schematics or info for Motorola R-1010A signal generator - Page 1
Forum section: electronics / repair

author: CaptDon
author_rank: Super Contributor
timestamp: January 17, 2024, 02:56:24 pm
content: This was an Ebay purchase 'as is'. Its main malfunction was a bad LM723CH (TO-5 case) regulator for the +18vdc rail. All other supples are referenced to the +18 so all supplies were about 30% lower than spec. After repairing the power supply board I found 2 of the 4 P.L.L.'s are unlocked. I would like to find a service manual or any info to help me repair the unit. I don't want to just start 'turning things'. Thanks!!I will also post this in the Ham Radio forum. I have heard this unit was possibly made for Motorola by Boonton or someone else. It is 1MHz to 520MHz in 1KC steps using 6 thumbwheels. I haven't found any useful information online so far.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 17, 2024, 03:18:26 pm
content: normally you dont double post btwyou stay in the repair thread

author: CaptDon
author_rank: Super Contributor
timestamp: January 17, 2024, 03:37:13 pm
content: Yup, I don't like cross posting either. I was unsure how many folks really read only one forum? I only read / post to 4 of the forums. I am really reaching out on this R-1010A since although it wears Motorola's name I was advised it was probably made for them by someone else. Local Motorola guys don't seem to recognize the unit.
Need second opinion on choice of cables - Page 1
Forum section: electronics / repair

author: vjekobalas
author_rank: Regular Contributor
timestamp: January 28, 2022, 08:15:39 pm
content: The following 3 types of cables are used in a MedContourultrasound head (for beauty salon) in a flexible plasticconduit with steel wire coil support. The conduit/cables experiencesome heat from the ultrasound head as well as constantmovement.I need to replace the cables as one of them was worn outand thought of changing all of them as I noticed they are all hardening near theultrasound head due to heat / movement and it's too muchwork pulling them apart again at a later stage :Here are the original cables/ some writing on them (as well as I coulddecipher it) and below are the alternatives I found as I can't find originalslocally unless I buy bulk)(1)Baldassari Special CAVI LIYCY 4x2x0,25 A1997 IEC 60332.-3-24 CE2 20-22 ZIhttps://www.specialcavibaldassari.it/sites/default/files/SB_SCHEDA_LiYCY-TP.pdf(there's 3 types of LiYCY cable they make but from the color this should beit)(2)E163860 Shielded Alpha Wire H1 P/N 2461C 2C 22AWGhttps://www.alphawire.com/Products/Search#productpartnumber=*2461C*&e=0https://www.alphawire.com/Products/cable/alpha-essentials/communication-and-control-cable/2461C(3)Black CoaxI043 Prospecta RG 174/U MIL C17 50 OHM UV – HD 605/A1T708600084 Product I043https://www.prospectasrl.it/wp-content/uploads/2014/06/Catalogue_RG_EN3.pdfAlternatives:(1)https://products.lappgroup.com/fileadmin/documents/technische_doku/datenblaetter/unitronic/DB1030600EN.pdf(2)LappKabel UNITRONIC® FD CP plus A 2x0,34https://products.lappgroup.com/online-catalogue/data-communication-systems/low-frequency-data-transmission-cables/din-colour-code/unitronic-liycy-tp-bk.htmlhttps://www.lappkabel.de/produkte/online-kataloge-shop/datenuebertragungssysteme/datenleitungen-niederfrequenz/hochflexibel-und-ulcsa-zertifiziert/unitronic-fd-cp-plus-a.html?tx_dgpsolr=11139617(3)For the RG174 I found several companies which add the BNCconnectors, so I'll just buy them made to length I needas I don't need or want to get into buying good crimping toolsas would seldom need them.Was wondering whether someone with more experience in cablescould comment if there are any better alternatives consideringthe ultrasound heating and cable conduit being moved all the time(outer insulation and shield almost completely broken in the conduit )?
Need service manual for TEK series 200 multimeters - Page 1
Forum section: electronics / repair

author: gordo51
author_rank: Contributor
timestamp: August 12, 2021, 05:48:12 pm
content: I have a Tek DMM 252 which reads a bit off. Would like to tweak the adjustment pots but don't know what each one does. Anyone have a service manual or know what the pots do? Thanks for any help.

author: Testtech
author_rank: Regular Contributor
timestamp: August 17, 2021, 12:25:58 am
content: Thee is a "Tektronix Hand Held Instruments Basic Service" manual p/n 061-4123-00, it may help. It is available on opweb.de.
Need service manual for Yamaha RX-V585 - Page 1
Forum section: electronics / repair

author: mcomlos
author_rank: Newbie
timestamp: July 22, 2025, 10:23:37 pm
content: Hello all, need service manual for Yamaha RX-V585 /Thanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: July 23, 2025, 10:16:03 am
content: https://studylib.net/doc/27275792/smanual-av-rxv585ive seen some schematics in ituser manual just in casehttps://download.yamaha.com/files/tcm:39-1161671

author: mcomlos
author_rank: Newbie
timestamp: July 23, 2025, 01:31:44 pm
content: Thanks coromonadalix for your quick reply. Exactly what I was looking for!
Need service manual or schematic for Dynacord DSA8410  - Page 1
Forum section: electronics / repair

author: Rajan Paliwale
author_rank: Newbie
timestamp: September 17, 2020, 03:09:45 pm
content: Hi, one of my friend brought Dynacord DSA8410 for repairs. It is 4 ch amp.I don't have the diagram. I request you kindly help me find service manual or schematic for it Thanks.
Need Service-Repair Manual for my Hantek DSO1060 please - Page 1
Forum section: electronics / repair

author: IntronDSOs
author_rank: Newbie
timestamp: November 13, 2021, 04:48:43 pm
content: Hello,have anybody electronic Schematics for my Hantek DSO 1060 ?Many thx

author: coromonadalix
author_rank: Super Contributor
timestamp: November 13, 2021, 05:24:46 pm
content: Sorry to say Ask Hantek .... even under an non disclosure .. i dont believe there was one available or even leaked ...
Need some good USB type A and C connectors - Page 1
Forum section: electronics / repair

author: adauphin
author_rank: Unknown
timestamp: February 02, 2025, 12:53:05 pm
content: I have a few cables that need new connectors, as well as some custom lengths. There are countless manufacturers for these but curious to a well-known brand that people use. I'm likely overthinking this but I don't want a garbage connector either.
Need some help with a Marantz 2285B - Page 1
Forum section: electronics / repair

author: Ero-Shan
author_rank: Frequent Contributor
timestamp: May 07, 2025, 07:37:25 am
content: In an attempt to up the percentage of HIFI gear, here's a question regarding the vintage receiver from the subject.The receiver works basically, but I was asked to do a FM alignment. The service manual is readily available, so that shouldn't be a problem, should it?Well ... that manual is borderline terrible. The schematics are separated for each PCB and a drawing with the connections between them. Not a single signal is named. The schematics contain very obvious errors.They're also quite small, so even with a decent scan quality text is hard to read. This is annoying, but not the real problem.The real problem is that the IF section of my receiver is different to that in the manual, and I can't find one that fits.Attached is a picture of the one I have and what should be there according to the service manual.Does anyone have an idea where I can find schematics for what actually is in my receiver?Ero-Shan

author: coromonadalix
author_rank: Super Contributor
timestamp: May 08, 2025, 10:10:18 am
content: they say there's an non B model, and the B ?https://www.hifiengine.com/manual_library/marantz/2285.shtml

author: klausman
author_rank: Regular Contributor
timestamp: May 08, 2025, 11:21:58 am
content: Elektrotanya also has a bunch of separate service manuals, and addendum pages for different versions (B version, but also market-dependent, since FM ranges vary by region).https://elektrotanya.com/showresult?what=Marantz+2285&kategoria=All&kat2=All

author: Ero-Shan
author_rank: Frequent Contributor
timestamp: May 18, 2025, 08:20:21 pm
content: Thanks for the suggestions.I have tried the non-B manual already, but that is clearly a model released years earlier.The 'european' schematic at elektrotanya is kind of nice as it shows all on one page (now where is my A0 printer?).Anyway, after watching XRayTonyB's video on doing FM alignment (on a Marantz tuner nonetheless) I managed to get mine done, too. Hope the owner is as pleased with it as I am.Thanks again for your help!Ero-Shan
Need source for carbon ribbon tape for LCD repair 24 pin - Page 1
Forum section: electronics / repair

author: RobertSof67
author_rank: Newbie
timestamp: March 13, 2022, 06:14:45 pm
content: Hello!I am trying to help a friend fix an infrared remote that is no longer made. She damaged the carbon ribbon tape messing with it. I have a T iron and the conductive clear tape now. The ribbon is damaged enough that I am not able to get it to work. Plus I need it to be a little longer. At least 2”. It is 24 pin tape. I have included a picture. Doe anyone know where to source this? Any direction greatly appreciated. I am a hobbyist that most works on tube guitar amps.Robert

author: m3vuv
author_rank: Super Contributor
timestamp: March 14, 2022, 06:37:42 am
content: can you not solder some flat ribbon cable to the pcb?,if theres room.

author: m3vuv
author_rank: Super Contributor
timestamp: March 14, 2022, 06:39:17 am
content: ive seen similar used in wireless keyboards,or can you repair it using conductive ink?

author: RobertSof67
author_rank: Newbie
timestamp: March 14, 2022, 12:59:58 pm
content: Thanks for the reply! I can use a ribbon cable to solder direct to pcb. I just wasn’t sure if it would adhere well to the lcd screen. The existing plastic carbon ribbon was heat pressed to the lcd screen with conductive tape. I have the conductive tape and a t iron now. I have not played with conductive ink. I think you are suggesting I repair the existing carbon ribbon with that. I will look into that. Robert
Need Stencil for 88ss9174-bld2 bga reballing? - Page 1
Forum section: electronics / repair

author: abdolah
author_rank: Regular Contributor
timestamp: May 09, 2025, 04:16:13 pm
content: Hi everyone hope you have a great dayI was working on reballing this chip 88ss9174-bld2 , I don't know how to search for the stencil for it , I'm new to soldering rework and reballing ,Thanks for your time and help
Need Substitute for T90S1D42-48 Power Relay - Page 1
Forum section: electronics / repair

author: gaspower
author_rank: Newbie
timestamp: April 01, 2023, 11:56:49 pm
content: Hello,I am needing some help finding a replacement for a T90S1D42-48 Power Relay. I have searched for this item and just can not seem to find any on the market. I am hoping that there is a replacement. I am not familiar with these enough to know what a reasonable replacement would be. I would appreciate any advice or direction.Thank you, JR

author: elecdonia
author_rank: Frequent Contributor
timestamp: April 02, 2023, 12:21:52 am
content: 48V DC is an unusually high coil voltage.But the housing and form-factor shown in your photo resembles many similar power relays. There are numerous manufacturers of such relays. You don’t need an “exact replacement” made by the original manufacturer.Any relay with 48V DC coil and 30A contacts (and also where the pin layout fits your PC board) will work. If you cannot locate a relay with a 48V DC coil then look for a relay with a 24V DC coil and add a dropping resistor.

author: floobydust
author_rank: Super Contributor
timestamp: April 02, 2023, 12:22:12 am
content: Welcome to the forumsThat relay in popular T90 form factor but has oddball coil voltage, 48VDC. EOL but Mouser still has some in stock655-T90S1D42-48USD $7.28CIT Relay and Switch J115F11A48VDCS6.6 could also work.What's wrong with it, very difficult to wreck one of those.P.S. you work on GAS audio?

author: gaspower
author_rank: Newbie
timestamp: April 02, 2023, 12:37:24 am
content: Hello,Thank you very much for the replies. I will check Mouser on Monday, much appreciated. As soon as I turn on my unit, the relay just starts buzzing very loud. Luckily I had a backup unit and swapped out this board and the main unit now works, but need a replacement relay to fix the one I removed.Thank you so much,JR

author: floobydust
author_rank: Super Contributor
timestamp: April 02, 2023, 03:14:20 am
content: I would not blame the relay for the buzzing, it is more likely getting insufficient or dirty power. Did you try measure the coil voltage when it's supposed to be pulled in?The 47uF 63V cap and the biggest green film cap next to it are suspect.It looks like a soft-start circuit Niles Audio supply switch, which sorta looks like a mains capacitive-dropper powering the 48V relay coil. This is a guess.If the green dropper cap goes low value, the relay coil gets undervolted and may not always pull in hard. If the coil filter cap (47uF 63V better not be CapXon brand lol) goes low value then mains hum can reach the coil and make a racket.I suggest measuring the two capacitor values and see if they are in spec. and easy enough to add to the parts order. Desoldering the relay is not fun at all, it requires a lot of heat and patience on the thick pins.

author: gaspower
author_rank: Newbie
timestamp: April 05, 2023, 09:35:01 pm
content: Hello,Much appreciated for all the replies. Voltage seems to be fine for now. With every ones help I was able to find more of these relays. I did replace the relay and so far it is working.I appreciate all the help,Best regards, JR
Need to adjust Voltech PM6000 power analyzer - Page 1
Forum section: electronics / repair

author: dominitech
author_rank: Contributor
timestamp: August 27, 2020, 10:10:03 pm
content: Anyone have any success adjusting the Voltech PM6000? There are calibration commands for the PM3000A but unfortunately they do not work for the PM6000. Any info on how to adjust these either manually or remotely will be appreciated or even leads on where to get the info. I have tried contacting both Voltech and Tektronix but they both tell me to ask the other.Thanks in advance!

author: t1d
author_rank: Super Contributor
timestamp: August 29, 2020, 02:48:29 am
content: Just spitting in the wind, here, but... Alan (goes by W2EAW) on YouTube worked for Tektronix, at one point. Maybe he could point you in the right direction...https://www.youtube.com/user/w2aew
Need to figure out this missing SMD chip - Page 1
Forum section: electronics / repair

author: gotofbi
author_rank: Contributor
timestamp: April 02, 2020, 10:39:26 am
content: Hi,I am trying to repair car diagnostic dongle.My friend kicked usb cable and it removed USB-B connector.I cleaned old USB connector and was prepping to install new connector.However, I noticed that it is missing one of SMD connector right beside of USB connector.I touched that area with soldering iron while I was removing USB connector and not sure if the wasn't there from beginning or got removed by accident.I googled if I can find picture of the board and I only found one with lower resolution.To me, it looks like I am missing some SMD part but not sure what it is.Here is the finding that I have1. Black boxes are connected to GROUND2. Red box is the one that Im missing3. Blue box seems to be same one that supposed to be on Red according to low resolution picture4. Tested Ohm value of Blue box and it shows 0 ohm which I think its not Capacitor (correct me if Im wrong)5. Both pads on Red box are connected to groundSo, am I missing a SMD component? or it wasnt there from beginning?If Im missing something, what could be there?Thanks,High res image of working areaLow res of image where I found online. (to my eyes, there is a component thats missing on my board)

author: gotofbi
author_rank: Contributor
timestamp: April 02, 2020, 10:56:49 am
content: Quote from: blueskull on April 02, 2020, 10:46:35 amThank you so much,I will proceed to solder new USB connector!

author: gotofbi
author_rank: Contributor
timestamp: April 02, 2020, 11:44:15 am
content: Quote from: blueskull on April 02, 2020, 11:01:54 amAll my intention was to fix the unit.Its not my design nor I have capability to create duplicate one.Anyway, I soldered new USB connector with leaving Red box as isIT WORKS!!!Thank you so much!!
Need to find a replacement/substitute for this GaAs power Fet - Page 1
Forum section: electronics / repair

author: Bargainhunter
author_rank: Regular Contributor
timestamp: October 05, 2023, 03:58:11 pm
content: I am trying to find a replacement for this obsolete Hexawave HWL30YRA. I found someone who has some Hexawave HWL36YRA's in stock. I wonder if they can be used in place of the Hexawave HWL30YRA. Is there anything else that can be used such as GaN fet? Even if I have to alter the circuit. I'm looking for something reasonably priced (under $20.00). I've attached the datasheets for the HWL30YRA and the HWL36YRA. This component is from a R&S SML-01 signal generator.Thank you for your help.
Need to find RH744 Dell Power Supply 345W schematic for DELL Poweredge 860 Serve - Page 1
Forum section: electronics / repair

author: queennikki1972
author_rank: Regular Contributor
timestamp: September 08, 2019, 01:16:20 am
content: As the title says, Id like to find RH744 Dell Power Supply 345W schematic for DELL Poweredge 860 Server. I have already replaced the power supply with a brand new one, but as power supplies are my favorite things to tinker with, Id like to find out if it has some sort of onboard fuse or resistor or something that may be the likely culprit. Its a pretty complicated switch mode power supply.

author: queennikki1972
author_rank: Regular Contributor
timestamp: September 08, 2019, 01:26:29 am
content: Found this link but was not helpful.. True you can buy a new one for $18, but I was just thinking I could try to fix it..https://www.dell.com/community/Desktops-General-Read-Only/Power-supply-schematic/td-p/5139263"RE: Power supply schematicThe only way you'll find one is to produce one yourself - power supplies are not repaired when they fail - they're replaced. It's essentially a sealed unit - no serviceable parts."
need to identify a  SMD Diode  - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: April 10, 2025, 07:17:14 am
content: helloPFA Image+ 3.3V is coming to the cathode . looks line a ZenerAnode is commonThanks in advance

author: Smokey
author_rank: Super Contributor
timestamp: April 10, 2025, 07:22:52 am
content: https://www.vishay.com/docs/88912/diodesgroupbodymarking.pdf

author: antenna
author_rank: Frequent Contributor
timestamp: April 10, 2025, 08:04:58 am
content: SL23 shottky diodehttps://www.vishay.com/docs/88741/sl22.pdf

author: hitecelec
author_rank: Regular Contributor
timestamp: April 10, 2025, 09:30:12 am
content: thanks
Need to identify degraded computer monitor screen membrane - Page 1
Forum section: electronics / repair

author: Tim88
author_rank: Regular Contributor
timestamp: August 26, 2024, 08:16:31 pm
content: This monitor got very hot and the heat evidently degraded this reflective coating/sheet. Not exactly sure what you call it and hopefully a guy can get some replacement? You are looking at what is left after removing 3 plastic sheets and the led screen. Remaining (the pic) is a piece of glass with the degraded white stuff underneath. Looks like it is gonna be a mess so haven't taken it any further till I know what is what.Thanks!

author: amyk
author_rank: Super Contributor
timestamp: August 27, 2024, 02:26:16 am
content: What type of monitor is this? LCD or OLED?

author: Tim88
author_rank: Regular Contributor
timestamp: August 27, 2024, 03:55:51 am
content: It is a LCD.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 27, 2024, 08:07:29 am
content: would help if any model print text where it com from .... brand etc ...

author: Tim88
author_rank: Regular Contributor
timestamp: August 27, 2024, 02:12:48 pm
content: Sorry, it's an Acer Predator XB1 XB321HK. I thought all monitors had the same screen components.

author: amyk
author_rank: Super Contributor
timestamp: August 29, 2024, 02:30:24 am
content: Is this between the LCD panel and the side you look at, or between the panel and the backlight?

author: Tim88
author_rank: Regular Contributor
timestamp: August 29, 2024, 10:24:02 pm
content: You are looking at what is left after removing the LCD panel and 3 layers of plastic film. It is a sheet of glass with something whitish behind it.

author: MAS3
author_rank: Regular Contributor
timestamp: August 29, 2024, 10:41:56 pm
content: That would be thediffuser, meant to evenly distribute the backlight.

author: Whales
author_rank: Super Contributor
timestamp: August 29, 2024, 10:44:03 pm
content: Every monitor has a different stackup of layers made by different companies. Best you can probably do is pull apart some broken monitors of the same size, try switching the parts and see how it looks.Work somewhere very clean (ideally under a flow hood but few have those) otherwise you will end up with annoying specs of dirt and hair visible in the screen.

author: amyk
author_rank: Super Contributor
timestamp: August 30, 2024, 02:16:13 am
content: Look for diffuser sheets. They're widely available online.

author: Tim88
author_rank: Regular Contributor
timestamp: August 30, 2024, 02:23:54 pm
content: Ok, did a little looking on the diffusion sheets and I believe those are the 3 sheets I removed just under the LCD panel? Found a couple pics and isn't what I need is the white reflection film?