hybridfree/eevblog-posts huggingface dataset:
Agilent Keysight DSO5014A Oscilloscope Channel with slow rise / fall times - Page 1
Forum section: electronics / repair

author: euzer
author_rank: Regular Contributor
timestamp: July 24, 2025, 09:02:50 am
content: I'm seeing delayed rise and fall times on a single channel (ch2) of an Agilent DSO5014A oscilloscope. The attached image shows channel 1 and 2 connected to the same signal. If I swap round the probes then the issue stays with the channel and not the probe. I've checked the channel settings and they're both the same, so suspect a hardware issue with the channel input circuit. I haven't opened the scope to inspect it. Has any one experienced this or suggestions before I take a look myself?Thanks.

author: iAleks
author_rank: Regular Contributor
timestamp: July 24, 2025, 04:48:25 pm
content: Try reset settings?Measure resistance on connector

author: euzer
author_rank: Regular Contributor
timestamp: August 07, 2025, 09:40:32 am
content: After reassembling the scope after having taken the photos, waveforms on the channel in question now appears as expected.
Agilent Keysight N9320B missing internal drive - Page 1
Forum section: electronics / repair

author: analogRF
author_rank: Super Contributor
timestamp: November 12, 2019, 10:38:21 pm
content: I just got this N9320B in an auction (supposedly came from a university) that does not boot properly. It gets stuck at the Keysight splash screen (after passing the Agilent splash screen)I opened it up and I noticed that there is an internal memory that is missing. It is actually removable from the back of instrument like hard drives but it does not seem to be a hard drive. It is not deep enough for a 2.5" hard drive to fit and the connector is male (see pics)I cannot find any mention of this piece anywhere in the datasheet, user guide, or even the service guide that a friend gave me.I don;t know if it is just an option that never existed or is it essential for booting the system. Does the firmware sit on this?Also what type of memory could it be, is it some kind of compact flash or ssd ?any suggestions on how to proceed?

author: coromonadalix
author_rank: Super Contributor
timestamp: November 12, 2019, 10:54:12 pm
content: this slot is the gpib interface option ...seen on this page photos and the options ... for the boot problems, you may have some hints too ??https://www.keysight.com/en/pdx-x201742-pn-N9320B/rf-spectrum-analyzer-bsa-9-khz-to-3-ghz?cc=US&lc=engconfiguration guidehttps://literature.cdn.keysight.com/litweb/pdf/5990-8120EN.pdfand finally another thread herehttps://www.eevblog.com/forum/testgear/spectrum-analyser-virus/

author: analogRF
author_rank: Super Contributor
timestamp: November 12, 2019, 10:59:31 pm
content: ahh! yes, of course it must be the GPIB optionstupid meso my quest for solving the boot issue goes on...I unpacked the firmware file and it seems to be based on vxworks.... I need to find out a serial console/interface to see what is going on, am I right?

author: analogRF
author_rank: Super Contributor
timestamp: November 13, 2019, 02:47:56 pm
content: there is a DS1390U RTC with SPI interface on the board, do you think I can connect the RX/TX lines to a serial to USB converter and get a serial console to see the boot process?
Agilent LCR meter 4285A Bridge Unbalanced - Page 1
Forum section: electronics / repair

author: Takasaka Chikuho
author_rank: Newbie
timestamp: March 26, 2025, 03:25:40 pm
content: My friend owned a Agilent 4285A, In fact, I need a LCR meter, a error show "Bridge Unbalced", and he told me if I can fix it, he can sell me cheapest price.So, I find it on internet and maybe 2 method to fix. One is replace a fuse on A4 DC Power Board, but that fuse is working.Another method is a option, it is a floppy (04285-63001) or (04285-63002), I can't find anything about it even a picture. Anyone own this floppy or who successed fix this error?
Agilent MSO 54642D Fault - Page 1
Forum section: electronics / repair

author: johnbscot
author_rank: Newbie
timestamp: January 26, 2025, 05:35:39 pm
content: Hi,I have an Agilent 54642D 500 MHz MSO scope which has a problem with CH1.It regularly has a negative bias on switch-on, which can clear if left on for a 20-30 minute period and slowly recover, or on switch-off, it can sometimes start as normal.CH2 does not have this issue.Any thoughts, please?I have the service manual but it is of no help!Regards John

author: Harry_22
author_rank: Frequent Contributor
timestamp: January 26, 2025, 09:09:41 pm
content: Hi!Most probable this is some electrolitic capacitor recover issue. You have to compare both channels.

author: johnbscot
author_rank: Newbie
timestamp: January 27, 2025, 06:39:55 pm
content: Thank you,you may be right. Unfortunately, the two-channel input circuitry is hidden under aluminum covers, so little access.I wish that I could find a schematic, but all attempts have come back 'Blank'Kind regardsJohn

author: benj38
author_rank: Frequent Contributor
timestamp: January 31, 2025, 09:19:09 pm
content: You can try to heat the input circuitry by directing a heat gun at the aluminum cover (be gentle), and similarly cool it with freeze spray (or just a compressed air can: if you keep at it it will start spraying cold gas).If this causes the problem to come/go, then I guess you will be more confident that it is worth the effort of removing the cover and pinpointing the exact component.
Agilent MSO 6034A 300Mhz scope  - repairworthy or not? - Page 1
Forum section: electronics / repair

author: mkz
author_rank: Newbie
timestamp: December 11, 2021, 07:57:12 am
content: Hi allAlso have an option on this scope, for $600Is this digitizer error something fixable/economical? Would I be wise to avoid it?thanks in advance
Agilent MSO-X 3024A one channel crapped out - Page 1
Forum section: electronics / repair

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: December 08, 2021, 09:43:14 pm
content: My trusty MSO-X 3024A oscilloscope's channel 3 seems to have cacked out.The faulty channel sometimes works fine but occasionally drifts off and displays random signal.I have been triggering from it when it happened this time and triggering stops as well which points to the analogue frontend.Sometimes it comes back after some time and power cycle, sometimes - not.The scope hardware has not been modified apart from PSU replacement a few years back.Attached picture shows the signal with input disconnected - no probes or BNC cables.The problem only seems to affect 500mV/ to 5V/ input ranges - the 200mV/ and less are OK. Owners would know that you can hear relay click going from 200mV/ to 500mV/.Sounds like a bad input range relay, doesn't it?Anybody had this? Anybody fixed theirs?CheersLeo

author: TheSteve
author_rank: Unknown
timestamp: December 09, 2021, 02:45:18 am
content: I've never seen anyone with this issue before. Could be a relay, could be an attenuator maybe?All 4 channels are the same so it should be possible to compare them at the PCB level, not much fun to run the scope when it is in pieces though.You should update your firmware - if you have anything that is Agilent branded it may be possible to suffer from NAND corruption.

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: December 09, 2021, 09:26:20 am
content: Thanks, Steve.I had to repair input relays before. 1990's LeCroy input RF reed relays often fail. I have replaced 5 or 6.Leo

author: wraper
author_rank: Unknown
timestamp: December 09, 2021, 09:53:43 am
content: Try slapping it when the issue happens. If it's a bad relay, there is good chance that contact will be restored.

author: Hexley
author_rank: Regular Contributor
timestamp: December 12, 2021, 06:29:02 pm
content: I had a very similar problem on my DSO-X 3024A, in which the behavior of one channel changed when the attenuator relay changed state. I retouched the solder joints on L1 and R1 (see attached image, which is borrowed from the main hack thread). That restored proper operation. In my case, those components had been changed as part of the bandwidth upgrade mods that I had done earlier, so it was not the fault of the Agilent factory. Sounds like your situation is different, but perhaps a close inspection of that area is in order.Good luck.
Agilent MSO -x 3054A - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: December 17, 2019, 10:05:33 am
content: HiAgilent MSO dosent boot up. Only front panel REF LED lit upAny hints if someone has encountered this problemRegards

author: Zucca
author_rank: Unknown
timestamp: December 17, 2019, 10:14:45 am
content: Call Keysight. It is a known problem.

author: hitecelec
author_rank: Regular Contributor
timestamp: December 19, 2019, 01:23:27 pm
content: HelloWill contact . thanks
Agilent MXA N9020A dead power supply - Page 1
Forum section: electronics / repair

author: Ahyuan
author_rank: Newbie
timestamp: January 17, 2023, 07:18:03 pm
content: Unlikely, but does anyone have any documentation on the power supply for an Agilent MXA N9020A signal analyzer? I am getting 5.1V SB but no 15V SB... power supply is a mess and there is no helpful silkscreen. Figured I'd ask before dropping $600 on a new power supply. Frustrating thing is, the PSU has already been replaced about a decade ago.
Agilent Mystery PCB - Page 1
Forum section: electronics / repair

author: sampler1
author_rank: Regular Contributor
timestamp: July 06, 2021, 08:56:25 pm
content: Good Day to all,I came across this Agilent power supply PCB and I am trying with no luck to find out what model # does it belong to??The markings are30-04-0001-12Digital PCBRev AAnyone know

author: fzabkar
author_rank: Super Contributor
timestamp: July 06, 2021, 09:32:50 pm
content: I haven't visited either of the following URLs ..."Agilent/Keysight E3631A Power Supply Secondary Board 30-04-0001-12 Digital PWB"http://sanhis.irevo.space/Jwm7bm23aX4UP4/http://fwamor.jorle.space/mjhUbm23aX4UP4/Edit:This service manual has no reference to this PCB???https://elektrotanya.com/hp_agilent-technologies_e3631a_dc_power_supply.pdf/download.html

author: sampler1
author_rank: Regular Contributor
timestamp: July 07, 2021, 01:27:36 am
content: Fzabkar,Very funny ! Ha haYour links are garbage and the E3631A does not use a separate digital board.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: July 07, 2021, 04:02:13 am
content: Looks a lot like the board out of an E3646A, but has a slightly different layout, maybe a different variant of the same power supply.https://youtu.be/qoqpyCbifz4?t=204

author: sampler1
author_rank: Regular Contributor
timestamp: July 08, 2021, 05:21:09 pm
content: Hi Defpom,Yes it has the same connection layout as the E3646A but It also looks like it has a lot less components. It does say revision A but could it be so different?by the way, I'm a big fan of your youtube Videos! Thanks.

author: sampler1
author_rank: Regular Contributor
timestamp: July 09, 2021, 03:55:38 am
content: Defpom ,Was Right ! it is from an Agilent E3646A and even better I found the problem with it.It was not working and the voltages were all over the place when I installed it in an E3646A. If you look around the net you will see a totally different PCB used in the E3646A , this is why i suspected it was the wrong PCB.Well anyhow, there is two electrolytic's on the PCB , both read good in value but one was leaking really bad. I replaced it and all booted up fine. Note: The revision A , digital PCB is not what you see in the manuals and not what you will see on the net.Now to finish the repair. Channel one is perfect and channel 2 is dead. Should be easy enough now.Thanks all,
Agilent N1996A repair - Page 1
Forum section: electronics / repair

author: stan_cool
author_rank: Newbie
timestamp: November 05, 2022, 08:25:41 pm
content: I just purchased Agilent N1996A on ebay, listed for repair. Upon inspection I found that one of the 3 boards inside is missing, that is N1996-60003 power supply board. After purchasing the board separately and reinstalling it the unit now turns on, but the screen is absolutely black and the unit makes no sound. However the fan is running and I can see the unit is taking about 0.5A of current.I am wondering, what would be the steps to troubleshoot?1) Is there any console/debug port that I can hook up to and see the actual linux booting?2) Maybe if the problem is just in the screen I could send some GPIB commands and verify it that way?Anything helps!

author: TheSteve
author_rank: Unknown
timestamp: November 06, 2022, 05:45:34 am
content: The N1996A doesn't have GPIB. If it is alive you should be able to connect it to your lan and it should grab an IP address. It should answer telnet requests.I think I still have a spare CPU board for an N1996A that has a small flaw but does boot up and work.

author: stan_cool
author_rank: Newbie
timestamp: November 07, 2022, 05:15:35 pm
content: Thank you so much for the reply!I am wondering if the PSU board is also a CPU board actually?Everywhere it says it's a PSU board but upon close examination it seems that the second board (sandwiched on top) is actually a digital board with some memory chips (and what looks like a PCMCIA card). Is the actual CPU on the second board or is it in the PCMCIA card that I am missing?

author: TheSteve
author_rank: Unknown
timestamp: November 07, 2022, 07:45:17 pm
content: The smaller daughter board is the actual processor unit. The PCMCIA slot was only used for recovery if the internal flash became corrupted and is normally empty.I assume the blue cable was connected when you had the card installed.

author: stan_cool
author_rank: Newbie
timestamp: November 10, 2022, 07:18:48 am
content: Thanks, yeah, the blue cable is connected.Update: I was able to telnet into my unit and verify all the usual locations for the software (see other threads) and the options inside of the elgato.lic file. Also connected to the unit from the Keysight Connection Expert and sent a couple of commands. At this point I am sure the unit is at least working, so I am narrowing down my repairs to the screen area.The screen is Mitsubishi AA084XA03, 8.4" 6/8 bit LVDS screen, readily available on the ebay.

author: TheSteve
author_rank: Unknown
timestamp: November 11, 2022, 04:47:14 pm
content: Did you verify its not a dead backlight in the LCD?
Agilent N5181A MXG Signal Generator info - Page 1
Forum section: electronics / repair

author: Carbedd
author_rank: Newbie
timestamp: February 16, 2025, 06:32:45 pm
content: Hi, is anyone aware of the system Agilent uses to "install options" on their products?Specifically the N5181A signal generator, it would seem that there are some software blocks (something like the Rigol DHO/DSOxxxx).Does anyone have experience with this?
Agilent N6700B troubleshooting - Page 1
Forum section: electronics / repair

author: bat
author_rank: Regular Contributor
timestamp: October 08, 2025, 09:11:29 am
content: HeyI replaced the module carrying PCB on a N6700B, before that, some pins were bent and caused shorts, when the instrument was on, the display would sit still showing "Agilent N6700B mainframe"Before replacing the PCB, I removed the short by removing the bent pins, turned it on and there was no issue.Fast forward today, I replaced the PCB and the issue is back. removed the module connector to disconnect it, thinking that there may be a short again but nothing.I noticed one odd thing, the back orange led on the A5 board turns on and off, I tried to search for a reason why it's on, looked on the Agilent manuals and Keysight but I couldn't find anything...Does anybody know what this LED means ?Thank you
Agilent N9320A TG3 option - issue with RF output level - Page 1
Forum section: electronics / repair

author: mzj
author_rank: Newbie
timestamp: December 25, 2024, 06:07:12 pm
content: Hi.I have big issue with RF output level of TG3 option installed in N9320A. Please see the attached picture as well as the details described in the following:1) The RF output looks exactly the same regardless of its settings. TG does not respond for a level change, it is always c.a. 14 dBm in peak and the difference is almost 20 dBm. I confirmed these levels with R&S power meter and Marconi 2830 SA.2) During manual manipulation on RF out level setting I don't hear any mechanical switches.3) When RF out level is set to auto I cannot change attentuation settings - it is always 0dBm.4) TG reacts correctly on any change of SA frequency settings. I can set any correct (in terms of range) frequency in Zero Span mode and I see correct sweep in Full Span as well as in manual span control.5) I can normalize TG and it works correctly - but this is not a way to normal work.6) The screenshot is taken from the problematic machine, but I know that SA measurement is correct, because I confirmed it's correct work by CAL OUT and R&S SMIQ generator.To be honest I don't know internals of this model and don't have service manual. Maybe some one can direct me where to start with diagnostics/repair?
Agilent oscilloscope 54542A freeze au bout de quelques minutes - Page 1
Forum section: electronics / repair

author: joel14
author_rank: Newbie
timestamp: May 13, 2024, 07:22:38 am
content: Bonjour,Je possède un oscilloscope 54542A depuis 15 ans. Je l'ai eu suite à la liquidation d'une usine Philips. J'ai changé sa batterie interne il y a 10 ans et la calibration a parfaitement fonctionné. Depuis 6 mois environ l'écran et le clavier se fige au bout de quelques minutes (10 minutes max). Cela se passe sans aucune intervention sur l'oscilloscope. Il faut éteindre et rallumer l'appareil pour qu'il fonctionne à nouveau pendant quelques minutes.Merci pour vos infos qui vous connaissez ce problème du 54542A.Cordialement.Joël14 - Electronicien à la retraite.Situé près de Honfleur - Normandie - France

author: Greybeard
author_rank: Frequent Contributor
timestamp: May 13, 2024, 09:31:44 am
content: Google Translation:Quote
Agilent spectrum analyzer E4440A power supply - Page 1
Forum section: electronics / repair

author: Handel
author_rank: Newbie
timestamp: April 19, 2021, 06:08:05 pm
content: Hello all,I am looking for schematic for the power supply module of the Agilent E4440A spectrum analyzer. The module is 0950-4447 revision 002.The module is broken and it should be possible to be repaired by soldering but very hard to do without the schematic.Thanks.Br,Handel

author: Gip
author_rank: Newbie
timestamp: April 22, 2021, 12:31:05 pm
content: Hello, pls visit thehttp://www.ko4bb.com/getsimple/index.phpis a great database and resource to search for different shematic diagrams and service manuls. I don't know, if you specifically find something for your instrument, but it's worth a try. however, the shematic diagram of your power supply is similar, if not even auspicious to many models of the series E4400.regardsGianpiero
Agilent U1252B DCV & Resistor measurement not working properly - Page 1
Forum section: electronics / repair

author: hlj.pycad
author_rank: Contributor
timestamp: June 18, 2024, 12:04:09 pm
content: I got two U1252 multimeter, one is U1252A, the other is U1252B. Their are almost identical and has the same feature as U1253A/B except it is LCD monitor while U1253A/B has a fanccy OLED, and BOTH of my two U1252 have problem with measuring DCV & Resistor when most of the other features are fine.I record it to a video to demostrate what is like now, here are my observations:1. with probes open, the resistor reading is not "OL", it's tens or hundreds Mega ohm. Measuring resistor more than 1M will notice obvious drift.2. it's highly huminity sensistive, a few second's of hair-dryer blowing will make the reading to "OL", and everything seem more accurate than before, but it will slowly drift back to prior status.3. DCV is similar, the reading drift and highly senstive to the hair-dryer.4. DC mV is very accurate and not drifting. So I believe it about the attenuation/amplification?5. There are 2 peice of PCB, and I tried apply the hair-dryer seperated, the buttom one is suspicion for the problem, it's much more sensitive to the hair-dryer.6. I have two of these multimeters and BOTH of them have the same problem, so I think it's kind of common problem for this model, maybe there are people've run into and solved it, but there are not more useful result by Google "U1252A problem".Thanks in advanced.

author: jchw4
author_rank: Regular Contributor
timestamp: June 19, 2024, 06:19:34 am
content: Did they experience any battery leaks? If they did I would suggest searching for "Fluke 189 battery leak" here on eevblog forum and you will get plenty of information on cleaning the contaminated PCB.

author: tooki
author_rank: Super Contributor
timestamp: June 19, 2024, 06:54:17 am
content: Quote from: hlj.pycad on June 18, 2024, 12:04:09 pmWhen you say you’re using a hair dryer, are you blowing cold air or hot air? Most hair dryers only blow warm or hot air, and it seems to me FAR more likely that it’s the heat, not a drying effect, causing the behavior you observe.Another possibility is that it’s neither heat nor humidity causing the effect, but static electricity. I have two U1252B myself and I know they’re quite sensitive to electric fields even when the case is closed, so with the case open you could be creating static charge right on the board, which then dissipates. (And if you’ve left the filter setting turned on, that will also make the displayed value fall slower.)

author: hlj.pycad
author_rank: Contributor
timestamp: June 19, 2024, 02:37:31 pm
content: Warm air indeed. At first, I was thinking warming the PCB up cause it, but I also tried puffing air by mouth to it, the reading will instantly drop significantly, which I forgot to put it in the video. So warm moisture has oppisite effect to warm dry air, I believe huminity take a greater part in it, again, just an observation, no technical evident by now.
Agilent U1252B eeprom dump needed. - Page 1
Forum section: electronics / repair

author: hlj.pycad
author_rank: Contributor
timestamp: May 25, 2024, 04:11:36 am
content: , I completely screw my DCV with faulty calibration ( problably turned it off during calibrating ), and I can't calibrate DCV any more, input 3V will say "Er.006"So need a functional machine eeprom dump.. it's a 8pin ic can dump onboard with ch341 programmerAny help would be apperciated...
Agilent U1273A value for L1 needed - Page 1
Forum section: electronics / repair

author: Aheld
author_rank: Regular Contributor
timestamp: March 11, 2022, 08:56:03 am
content: Hi Forum,is there anybody who can tell me the value of the inductor L1 from Agilent U1273A DMM?(Picture is attached).Thanksaheld

author: Aheld
author_rank: Regular Contributor
timestamp: March 13, 2022, 09:32:05 am
content: Hi Forum,I started some trials, and found out that a 2.7uH inductor works fine at this position.A picture of the used Inductor type and and mounted solution are attached.Maybe it helps for some one in the future
Agilent U1604a/b scopemeter - Page 1
Forum section: electronics / repair

author: DKMac@home
author_rank: Newbie
timestamp: August 12, 2020, 04:36:04 pm
content: Hello allIn the process of trying to repair a U1604B scopemeterScope section was working but DMM section was not.could switch between scope and DMM, but DMM would not display any readings Just linear bar graph and sometimes dc symbol,but blank reading. IN volts, ohms, diode etc. not 00000 just blank.Wanted to know if anyone could direct me to schematics for this device.Very complex duo board design, tough to reverse engineer.Thanks for any input
Agilent U1620A Channel 2 not working - Page 1
Forum section: electronics / repair

author: TubeCharley
author_rank: Newbie
timestamp: June 04, 2023, 11:58:39 am
content: Hello I recently received an Agilent U1620A for repair.Channel 2 of the scoop does not work.The green line does not appear on automatic triggering.If you do the self -calibration function, an error code will appear channel2 offset: 0x8ff.Channel 1 is doing well and the meter function.I requested a service manually with schemes at Keysite, but these gave a very typical answer.That with this cheap (7000 euros mind you) handheld, equipment does not deliver manuals with schedule.And that I have to offer the device to them for repair.Can anyone help me with schedules or block schedules or has some one a different idea to repair this oscilloscope.

author: m k
author_rank: Super Contributor
timestamp: June 12, 2023, 02:47:14 pm
content: There are two channels, so you can expect two pretty equal routes in.If nothing else is available you can always start comparing.Then if the problem seems to be an ASIC I guess you're stuck.
Agilent U1732B LCR FAIL (constantly beeps and show FUSE in LCD) - Page 1
Forum section: electronics / repair

author: CharlieD
author_rank: Contributor
timestamp: September 23, 2025, 02:40:15 pm
content: I have an Agilent U1732B that after power on, starts to beep and show fuse in display. I obviusly checked the fuse and it is ok. It appears to be a problem with the fuse detection circuit, some missing line or something, the meter has problems before with leaky battery, and some traces and vias had to be repaired, if anyone knows something it will be appreciated, i'll post the fix if i manage to solve it.

author: CharlieD
author_rank: Contributor
timestamp: September 24, 2025, 06:51:43 pm
content: Update: I tried soldering a jumper on the fuse, and for a moment i tought that whas the problem (The original 100 mA 250V fuse measures about 14 Ohm with my Fluke 87V) this fuse is an input protection device, not power.After I did that, the meter stops doing the failure for about an hour, but then did it again, it is intermitent,I've noticed that before show FUSE in the LCD, in L and R scales, shows large values of Inductance & Resistance respectively, about 30 H and 200 kOhms depending on the scale, this maje me think about some componente in the input with leakage , but I'm not sure, please, any help is welcome, Im trying to trace the circuit .Edit: I have noticed that if I jump the + and the - terminal, before turn on the meter, it start and in R measurement mode shows the value of a small resistance, if I remove it, shows a high valua a seconds later and starts beeping and show fuse.
Agilent U8002A - Err 101(Flash Read/Write Failed) - Page 1
Forum section: electronics / repair

author: Chee
author_rank: Newbie
timestamp: June 21, 2023, 09:04:04 pm
content: Hello, I purchased a pre-owned Agilent U8002A power supply a few weeks ago which at the time seemed to be working just fine.I had been using it for about 2.5weeks without issue.However, a few days ago upon powering up the unit it threw a Err 101 on the screen which based on the user manual indicates a "Flash Read/Write Failed" error.In most cases, this error now occurs pretty regularly after about ~1minute after powering on the unit.Sometimes I am able to operate the unit for 5-10minutes before the error pops up.Is there any way for me to repair or fix this issue myself?I have asked Keysight technical support and they have mentioned I would need to pay for a KeysightCare technical support plan or pay for a repair service of the unit(currently awaiting quote).I assume both of these options will far exceed the price I paid for the unit itself so I am trying to see if I can fix or resolve the issue myself or do I now just have an expensive paper weight.Thanks for any suggestions!
Agilent\Keysight 3000x series scope repair. Sharing the experience. - Page 1
Forum section: electronics / repair

author: w1k
author_rank: Newbie
timestamp: September 30, 2019, 04:16:33 pm
content: Hi all!First post here. I have to share my experience repairing Agilent\Keysight 3000x series oscilloscope.First of all you can watch the repair process on the YouTube.https://youtu.be/MGPY9JhcEIgSometimes I have some measurement stuff to repair and this one is pretty interesting.The scope has defective channels 3 and 4. Usually it caused by defective acquisition chips, especially if it is about both channels 3 and 4( usually used much less frequently then 1st and 2nd). It is very difficult to replace this Acq chips , because it has a huge metal cooling shields and you need a good pre-heating soldering table or full size BGA soldering station to replace them.I decided to make it another way. I have another 3000x main board , probably with defective FPGA chip. I received this board with black screen ( cooling fan works) and I thought that it is a NAND memory problem. But re-flashing the firmware didn’t fix the problem , so I decided that it is 70% FPGA or 30% CPU problem.I had to transfer SPI Flash Loader , FPGA configuration and NAND memory chips to another board with working acqusition part(I wasn’t sure 100% in the repair beginning ).I was really happy when the scope successfully turned on and self calibrated.The whole repair process was about ~3hours +- 15 minutes.I hope you will enjoy this !Thank you!PS. Sorry for my engPSS. OMG , first video and it is 30 minutes 😊
(Solved) Agilent/Keysight DC Communication Source OV PROT Error - Page 1
Forum section: electronics / repair

author: ZGoode
author_rank: Frequent Contributor
timestamp: April 11, 2024, 09:47:43 pm
content: I'm running into a problem with my 66321B DC communication source, although it could also be user error. When toggling the self-test error check, it returns error 0, which means that it does not detect any error. When I turn on the output with or without something connected to the output, it goes into OV PROT mode. If I disable OV protection it then instead goes into unregulated mode. I have been trying to use it via front panel or 14565B software and get the same result both times.For anyone that owns a 66309, 66311, 66319, 66321 or similar source have you encountered a similar error?

author: Miek
author_rank: Regular Contributor
timestamp: April 12, 2024, 04:25:22 pm
content: I bought a pair of faulty 66312As a while back and one of them behaved like this. The problem turned out to be a blown output fuse on the mainboard.

author: ZGoode
author_rank: Frequent Contributor
timestamp: April 14, 2024, 12:43:01 am
content: Thanks for the suggestion, but I don't think the fuse is the problem. I checked all the fuses I could see inside the unit and none of them appeared to be blown.I think there is something else going wrong here, but am unsure as to what it is since this unit does not have a publicly available service manual (that I can find). I'm going through the 66309 service manual, since I am hoping that is similar enough.When turning off the OV protection, it sets itself to 0.7ish volts and shows a 1.4A-ish current draw. I feel like there is a short somewhere internally, but I don't see any toasty burnt parts.

author: ZGoode
author_rank: Frequent Contributor
timestamp: June 17, 2024, 01:16:16 am
content: Figured it out, and it was the stupidest thing. I had the two plugs crossed for that additional board on the 66321B. It appears to work as far as I am aware now.
Agilent/Keysight DSO5000 Series Problem Channel 2 - Page 1
Forum section: electronics / repair

author: Teichhermelin
author_rank: Regular Contributor
timestamp: October 16, 2020, 03:27:37 pm
content: The self-calibration stops at the second channel. You can see in the picture that something is wrong. Hysteresis error is the reason for the termination. Do any of you have an idea? Is that fixable? I am grateful for every idea.

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 22, 2020, 09:47:20 am
content: Have you opened the case? Any visible abnormalities?Did you make some measurements in the front end?
Agilent/Keysight E364xA front bezel as spare part - Page 1
Forum section: electronics / repair

author: 0xPIT
author_rank: Regular Contributor
timestamp: September 19, 2022, 08:28:21 am
content: Hi,I've recently got a working Agilent lab power supply very cheaply because it's front bezel is broken – see attached photo.Keysight does not sell this part according to their support person.So, I'm looking for pointers where to get a (used) front bezel for it, preferably in the EU.Any pointers?Fitting models are: E3640A, E3641A, E3642A, E3643A, E3644A and E3645AThanks,pit

author: alm
author_rank: Super Contributor
timestamp: September 19, 2022, 08:34:44 am
content: Unless you're really lucky and find someone with a front panel to sell (try the buy/sell section), your options are probably paying at least as much for a parts unit, 3d printing the side part and gluing that on, or 3d printing the entire front panel.

author: HighVoltage
author_rank: Super Contributor
timestamp: September 19, 2022, 08:36:48 am
content: It will probably be near impossible to find the front panel, unless you use another instrument for parts.However, I had a similar broken frame on one of these and glued it as best as possible.Then added a Keysight Bumper (front and rear) and the frame fracture was no longer visible.

author: strawberry
author_rank: Super Contributor
timestamp: September 19, 2022, 08:48:59 am
content: professional services that do UV laser SLA 3D printing (it only could cost same as original new part)with cheap printers it will look even worse than repairing existingwith soldering iron set to 100..200C can weld small plastic peaces and regrow bit by bit (must be same/similar plastic material so they can fuse together and not break)

author: alm
author_rank: Super Contributor
timestamp: September 19, 2022, 10:16:35 am
content: That's why I suggested printing just the side that's broken. Gluing or welding it without permanently attaching it to the frame will probably be tough. But printing just the left side, which is not very visible, and gluing that to the rest of the front panel, could work.

author: 0xPIT
author_rank: Regular Contributor
timestamp: September 19, 2022, 10:48:38 am
content: Thanks for the tips, folks.I presumed that printing itself would be the go to solution.However, the issue is with the model for that. The side is rather complex and it would probably take many hours to model something that is printable and actually fits, probably takes several tries as well.So, probably a good solution will be hunting for units with defects other than mechanical.

author: strawberry
author_rank: Super Contributor
timestamp: September 19, 2022, 01:06:46 pm
content: some might offer 3D scanning as wellfree option : Blender image conversion to 3D mesh. scanning done with cellphone camera
Agilent/Keysight N9340B SA battery replacement...any help ? - Page 1
Forum section: electronics / repair

author: ytterligare
author_rank: Regular Contributor
timestamp: October 24, 2022, 05:55:37 pm
content: Hello there, must replace the battery for this SA, but I'm struggling to find it original or equivalent herein Europe...I got one from a well known battery supply : the webpage claimed it was compatible with Agilent/Keysight N9340B, but, as you can see...: ( the received one is above, the original is below )Original -> left, received -> right :It clearly doesn't fit the N9340B form factor, as the battery is even longer than the chassis... :And here is the original one :Long story short...can anybody help me find a replacement for the battery at a decent price ? Anyone the had the same problem as I have, maybe ?A lot of website are listing this NF2040HD or other equivalent CS-ALN933SL as "medical replacement parts", inflating the price...Thank you !!Andrea

author: TheSteve
author_rank: Unknown
timestamp: October 24, 2022, 06:57:49 pm
content: There are several equivalents but none are "cheap". It is the same battery used in the Keysight Fieldfox and the U1620B scope. They each have a unique part number it is sold under.I have a new in box one but shipping overseas isn't a practical option.
Agilient E3632 Unreg Error when connecting load.  - Page 1
Forum section: electronics / repair

author: Els_Chaos
author_rank: Regular Contributor
timestamp: September 16, 2025, 04:44:04 pm
content: Hi everyone, I have a Agilient E3632A Power Supply suddenly stopped working with the Unreg Error while connecting load to it.When opened, there is voltage at its terminal as i set, so i think the CV is fine.It is the only power supply i have now so i have to repair it (Actually I spent my scholarship to bought it, just a second hand)Thank you very much.(I'm so sorry for my broken English)

author: IanJ
author_rank: Unknown
timestamp: September 16, 2025, 07:22:16 pm
content: I have repaired a good few of these Agilent power supplies, here's a playlist for them:https://www.youtube.com/playlist?list=PLFTNjqbH_TxkiYsF76ttjXmxgQeXewjSQGood luck.Ian.

author: hp3310a
author_rank: Regular Contributor
timestamp: September 17, 2025, 06:47:05 am
content: Not sure if that has anything to do with it but the sense terminal (S+) isn't connected to the + terminal like it is for the negative pair.

author: Kwakerman
author_rank: Regular Contributor
timestamp: September 17, 2025, 01:14:38 pm
content: Good spot!!

author: Els_Chaos
author_rank: Regular Contributor
timestamp: September 20, 2025, 03:10:46 am
content: Thank you very much. It is huge help for me. It worked again.
Aglent N9310 A Service Help - Page 1
Forum section: electronics / repair

author: py2wg
author_rank: Newbie
timestamp: June 17, 2022, 07:12:06 pm
content: Good afternoon, any colleague would have the Agilent N9310A service manual, I put rf in it and lost 30 db on the output, it only arrives now at -30 dbm, thank you, manoel
AGM ASP TM35-640 battery - Page 1
Forum section: electronics / repair

author: BRASKY
author_rank: Newbie
timestamp: December 04, 2024, 04:05:05 pm
content: Attempting to replace battery in this thermal monocular. I need to figure out how to remove the front focus ring to split case. Ring has a stop in both directions and no set screw that I can locate. Any advise on removing ring? I am assuming it just dead heads against the stop and then unthreads with enough pressure but would like to check with people with more experience before I put more muscle into it and find out I'm wrong. Any thoughts?Found a short video of very similar model without the large external focus ring and that just had a slotted nut so I would think either the focus ring on mine functions as the slotted nut or the slotted nut is located behind the focus ring. Either way the focus ring needs to come off. Thanks.
AIFEN-A9 c-210 (c-115/c-245) Err - Page 1
Forum section: electronics / repair

author: Lisariy
author_rank: Newbie
timestamp: August 19, 2025, 12:20:16 pm
content: When the station is turned on, it stops responding to any keys. When you press a key, it simply displays "Err". However, the station's standard startup sound is played, and it continues to heat up at the last set temperature. I have replaced the tip with a new one, but it has not yielded any results. I would greatly appreciate any ideas or suggestions. Thank you

author: Lisariy
author_rank: Newbie
timestamp: August 19, 2025, 09:46:02 pm
content: It was a simple solution: the key lock was turned on. To turn it off, hold down ch1 and turn on the power.
Aim TTi EX4210R Service Manual - Page 1
Forum section: electronics / repair

author: Shay
author_rank: Regular Contributor
timestamp: April 27, 2023, 05:19:04 pm
content: Hello,I am trying to calibrate the Aim TTi EX4210R Power Supply. I can't find a service manual for this unit, and other service manuals for similar power supplies don't have the same trimmer arrangement. Some have fewer or more trimmers and I've only managed to calibrate the voltage, but not the current.If anybody can help with the manual or a different method for calibration, it'll help me a lot.Thanks!

author: Gertjan
author_rank: Frequent Contributor
timestamp: April 28, 2023, 06:38:29 am
content: Write a polite e-mail to Aim TTi.To me they were very helpful with a similar problem, and sent me the requested service manual.Regards & good luck, Gertjan.

author: Shay
author_rank: Regular Contributor
timestamp: April 28, 2023, 09:56:54 am
content: Quote from: Gertjan on April 28, 2023, 06:38:29 amAlright, I've tried sending them a polite e-mail. Hopefully I'll hear back.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 28, 2023, 10:47:37 am
content: or maybe sometimes with an non disclosure agreement

author: Shay
author_rank: Regular Contributor
timestamp: April 28, 2023, 11:17:03 am
content: Quote from: coromonadalix on April 28, 2023, 10:47:37 amThey replied to me with the full service manual.If anybody needs it - PM me!

author: Gertjan
author_rank: Frequent Contributor
timestamp: April 28, 2023, 01:32:31 pm
content: Hi Shay,Congratulations with the Service manual. I hope it will help to solve your problem.But I am not sure if Aim TTi will stay this friendly if the requested Service Manual is immediately put on-line after they honour a request.....Regards, Gertjan.

author: Shay
author_rank: Regular Contributor
timestamp: April 28, 2023, 03:54:06 pm
content: Quote from: Gertjan on April 28, 2023, 01:32:31 pmGood point. if anybody is interested in the manual, PM me.

author: KirstyA
author_rank: Contributor
timestamp: August 18, 2023, 01:47:15 pm
content: Hi Shay,I would very much like a copy of this service manual having just bought a second hand EX4210R.It is working but I would like to calibrate it.Also is the fan running at full speed constantly on your unit?Mine seems to be and is quite noisy and annoying.I have PM'd you.Thank you
air blower fan blown on new combo hot air station 8586 - Page 1
Forum section: electronics / repair

author: elvan121
author_rank: Newbie
timestamp: July 18, 2020, 02:56:45 pm
content: Hi all,I have been given by a friend a new and never used hot air station.Problem is that the fan blown as soon as I turned on the station because they have connected the fan reversed, gnd to vcc and vcc to gnd.While looking on ordering a replace part from AliExpress, I have realized most of the fans are 24v, while the one blown one is 12v.I have checked further and the vcc source Max is circa 15vdc.Should I pick a 12v or 24v?Cheers and thanks in advance!
Air Condition PCB - Burned SMD Resistor Values - Page 1
Forum section: electronics / repair

author: sdancer75
author_rank: Frequent Contributor
timestamp: June 25, 2019, 10:30:07 am
content: Hi,I am trying to repair an Air Condition PCB that burned a PWM (NCP1200), an N-channel MOSFET (IRFUC20 MOSFET N-CH 600V 2A) and two SMD resistors. Take a look of them in the attached photos.So my question is :1. Do does exist any schematic for this PCB?2. In NCP1200 PWM datasheet for some projects suggests a >4.7KOhm resistor for pin8. Should I replace the burned SMD with that value? What values do you suggest?

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: June 26, 2019, 08:49:23 am
content: Appears to have a SMD resistor pin 5 to gate of the FET although it looks to be a divider to gnd the middle going to the FET gate.Its hard to tell from the pic. I looked a ta dew schematics on google of the control cctry IC and some do have a gate resistor but none appearing to have a divider network. The PDF does mention legacy designs AND8023 and I did see a schematic using AND8076 using said divider to gnd...amongst other changes....all very similar to yur IC.https://www.google.com/imgres?imgurl=https%3A%2F%2Fstatic5.arrow.com%2Fpdfs%2F2012%2F2%2F5%2F4%2F58%2F2%2F288%2Fons_%2Fmanual%2Fand8076-d_fig.13.jpg&imgrefurl=https%3A%2F%2Fwww.arrow.com%2Fen%2Freference-designs%2F70w-165v-ac-to-dc-single-output-power-supply-for-atx-power-supply%2F8b0acf4b07602981dc693b901d5e1d47&docid=Z_Kelok3GMVplM&tbnid=I0z4bB4ZfCK4GM%3A&vet=10ahUKEwiYwoLt34bjAhUKWCsKHZipAMcQMwhSKBAwEA..i&w=1074&h=609&client=firefox-b-d&bih=886&biw=1680&q=NCP1200%20air%20conditioner&ved=0ahUKEwiYwoLt34bjAhUKWCsKHZipAMcQMwhSKBAwEA&iact=mrc&uact=8FWIW

author: sdancer75
author_rank: Frequent Contributor
timestamp: June 26, 2019, 08:58:46 am
content: HiI suppose you refer to resistors R9 and R10 right (and maybe to R4)?

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: June 26, 2019, 11:06:27 am
content: R9 & 7 in the sch looks like R75 & whatever in your pic. I wonder if one is actually a ferrite bead to the FET gate? It’s hard to tell.Also as usual change all main electro caps.

author: sdancer75
author_rank: Frequent Contributor
timestamp: June 26, 2019, 11:41:05 am
content: Hmmm.... Its a risk I think, I will buy a used one and then I will try to fix this......
Aiwa cx-z1500 service manual - Page 1
Forum section: electronics / repair

author: rafik
author_rank: Contributor
timestamp: October 16, 2021, 03:06:42 am
content: Estimados señores, soy nuevo en el foro y les escribo para pedirles ayuda. Soy un electrotécnico principiante y estoy buscando el manual de servicio Aiwa cx-z1500.Lo consegui en la web pero está incompleto. Estoy tratando de reparar el modelo aiwa anterior pero no tengo el esquema completo. El problema está en el reproductor de CD porque cuando cambié el controlador TA2058F pude resolver la falla pero después de algunos minutos se volvió a cruzar. En la zona debe haber un cap o algo malo pero es muy difícil de seguir sin esquemas. Por favor, si alguien tiene el manual de servicio, le pido que lo comparta. Estaré muy agradecido por su ayuda.Espero conseguirlo con su ayuda. Gracias de antemano.Con sinceridadRafael73!

author: rafik
author_rank: Contributor
timestamp: October 16, 2021, 03:08:13 am
content: Dear Sirs, I am new in the forum and I write you for help. I am a beginner electrotechnic and I am looking for the Aiwa cx-z1500 service manual.I got it in the web but that is incompleted. I am traying to repair the above aiwa model but I have not the schematic compleate. The problem is in the CD reproducer because when I changed the driver TA2058F I could resolve the fail but after some minuts it got bad again. In the area must be a cap o something so bad but it is very dificult to follow without schematic. Please If someone has the service manual I ask to share it. I will be really gratefull for your aid.Hope i get it with your help. Thank you in advance.SincerilyRafael73!

author: andy3055
author_rank: Super Contributor
timestamp: October 16, 2021, 03:18:25 am
content: Try this:https://elektrotanya.com/AIWA_CX-Z1290_CX-Z1300_CX-Z1301_CX-Z1500.pdf/download.html
Aiwa Z-M2600 schematic - Page 1
Forum section: electronics / repair

author: tiesto23
author_rank: Contributor
timestamp: May 05, 2020, 10:14:23 pm
content: hi for alli hope you are ok all memeberi have aiwa z-m2600 wont start no poweri want schematic for this so i can try to fix it

author: coromonadalix
author_rank: Super Contributor
timestamp: May 05, 2020, 11:57:20 pm
content: Searched a lot on the web, all the websites i've found require registration and payments to download it, not sure if its fake ??The only one who could give you security payment is this ebay linkhttps://www.ebay.com/itm/Aiwa-z-m260-m2600-service-manual-original-repair-book-stereo-cd-tape-player/113699494834?If its a fake you can get refunded.

author: tiesto23
author_rank: Contributor
timestamp: May 06, 2020, 01:21:18 am
content: no way to find a pdf file

author: coromonadalix
author_rank: Super Contributor
timestamp: May 06, 2020, 03:09:26 am
content: you will have to buy it i guess
Aixun T3A damaged IC - Page 1
Forum section: electronics / repair

author: fichamba
author_rank: Contributor
timestamp: January 13, 2025, 05:19:26 pm
content: Hi everybody. One of my T3A is damaged. The bad component is an IC which I cannot find. Maybe somebody here will know which one it is. I include a pic of the IC in question. It hasn’t ground plane in the back.Please help me if possible. I’m in a hurry. TIA!

author: BC547B
author_rank: Contributor
timestamp: January 13, 2025, 06:32:39 pm
content: After a quick search turns out it's a Power/Charger IC by On-Bright as one chinese site mentioned...Here's a buy link from AliBaba:https://www.alibaba.com/product-detail/OBGZ12CP-IC-electronic-components-Chip-In_1601351354406.htmlAlso try to contact On-Bright:https://www.on-bright.com/en/index/

author: Harry_22
author_rank: Frequent Contributor
timestamp: January 13, 2025, 07:59:04 pm
content: Hi!

author: fichamba
author_rank: Contributor
timestamp: January 13, 2025, 09:08:37 pm
content: Thanks a zillion to both!! The problem is also in the uP…

author: fichamba
author_rank: Contributor
timestamp: January 13, 2025, 11:05:32 pm
content: …and I don’t have the uCode to program the ARM uPc. The board has the pins to program it from scratch, but I have only the firmware to be programmed thru the USB C port 8-(