hybridfree/eevblog-posts huggingface dataset:
Agilent 6GHz MXG Vector Signal Generator (N5182A) Teardown, Repair & Frac-N PLL - Page 1
Forum section: electronics / repair

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 19, 2025, 02:52:31 am
content: You can watch the video here: [41 Minutes]youtu.be/eDloywrp0dMIn this episode Shahriar repairs an Agilent N5182A MXG Vector Signal Generator. The instrument produces the correct output signal for some set frequencies but reports a Fractional-N Unlock error for others while the output signal completely disappears. The instrument also fails many self-test checks.The block diagram of the unit is described in details with a measurement strategy to analyze every element of the PLL loop. The band-pass filter banks are isolated and measured with a Siglent network analyzer and are shown to be fully functional. The VCO output amplifiers & doubler are also fully functional and tested using a Siglent spectrum analyzer. The PLL loop is then "overwritten" and manually adjusting the VCO control voltage demonstrates that the oscillator can cover its entire designed tuning range. The fractional-N divider also appears functional for the appropriate input frequency ranges. Finally, although the GaAs phase detector appear functional, it is possible for such a component to slowly degrade where the phase detection gain changes significantly. This custom Agilent part is sourced from a donor board and the instrument now functions across all frequency ranges and passes all self-tests.The phase noise performance of the unit is verified against the datasheet using an Agilent E5052B signal analyzer with cross-correlation capability.

author: tszaboo
author_rank: Super Contributor
timestamp: September 19, 2025, 09:57:44 am
content: Thanks for the video, i watched it and it was quite interesting.Could you make a short video, explaining the probe loading effect, and the probing method of the active probe? Most of that was screen captured.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: September 20, 2025, 12:21:39 am
content: Quote from: tszaboo on September 19, 2025, 09:57:44 amI do have some videos on active probes, some of this information is captured in those videos. But I do get what you are looking for. Note that for this particular case it was not so important because we were looking for presence of signals only and some relative measurements (not absolute values).
Agilent E7402A LO Unlocked - Page 1
Forum section: electronics / repair

author: Dunk
author_rank: Newbie
timestamp: June 07, 2025, 02:35:09 pm
content: Hello dear eevblog community,I need help repairing an Agilent E7402A.I bought the device at auction because it was displaying the "LO Unlocked" error message, see seller's picture:The first thing I did, of course, was take the device apart and clean it. Everything inside was covered in fine rust, as if the device had been standing next to a grinder in a damp basement.I was most worried about the RF part; it looked like water damage.It looked really bad.It took me three days and three-quarters of a bottle of ethanol. I unscrewed every single screw and cleaned every single card with ethanol, a toothbrush, and a fine paintbrush.Some screws on the RF deck were about halfway out, so someone took a look inside. Luckily, I didn't find any fresh solder joints.I replaced the internal backup battery and made an unpleasant discovery on the RAM module:After reassembling it, I turned on the analyzer and played around with it. I didn't damage anything while cleaning it; the device started up, the digital part worked well, and the display and all buttons worked.LO-Unlock, of course, hasn't disappeared.I watched the videos from "The Signal Path" () and hoped that the problem with my device was also due to the defective divider.Unfortunately, I discovered that my version of the RF card (E4403-20100 Rev 105) is more recent than the one in the video; I couldn't find the circuit diagram.At least the error pattern on the LEDs looked similar.Substituting the prescaler for a replacement component from China (€70, damn) didn't change anything.I also repeated the trick fromhttps://www.qcte.ca/testeq/e440x_sa/,installing two HMC862s (2x30€) instead of Agilent prescalers, but there was no improvement.Unfortunately, I don't have the good measuring equipment like Shahriar from "The Signal Path" and I don't have his expertise. What I do have is a DSO with a bandwidth of up to 100MHz and a TinySA, which is more suitable for estimation than measurement.These are the measured values ​​I was able to measure on the card:Voltages:+28 28,4V+15 14,8V+5 analog 4,8V+5 digital 4,8V-5 -4,8V-15 -14,4VFrequencies10MHz 10MHz21.4MHz Garbage, not stable600MHz 600MHz, measured with the TinySA, via a 20dB attenuator and a short piece of cable.Reference 4.651 MHzThis is also what the repair video shows: 600MHz / 129 on the prescaler = 4.651MHz.FLO/NLooks very badIt looks, like offset of the chargepump+ is about +10V, and chargepump- about -5V. Maybe there is something wrong.I'm slowly running out of ideas about which direction to dig in. I was hoping the eevblog community could help me find and fix the problem. I would appreciate any helpful tips.Thank you very much.

author: m k
author_rank: Super Contributor
timestamp: June 10, 2025, 09:04:15 am
content: If LO is Local Oscillator and 21.4MHz is needed it possibly can't be locked.Can you use a console and run some internal tests?Maybe 'Test Equipment' or 'RF, Microwave, Ham Radio' section is more pin pointed for high freq. machines.
Agilent 81130a wt power but no display  - Page 1
Forum section: electronics / repair

author: Paullovell
author_rank: Newbie
timestamp: March 27, 2023, 12:25:25 pm
content: Hi Guys,Does anyone can share their knowledge how to trouble shoot my agt 81130a no display but with power. I have not energized this one for 6-8 months…

author: m k
author_rank: Super Contributor
timestamp: April 01, 2023, 04:21:54 pm
content: The display has a power pin, is there a sane voltage?
Agilent 8163B lightwave multimeter with missing CF card - Page 1
Forum section: electronics / repair

author: ddrl46
author_rank: Regular Contributor
timestamp: April 07, 2023, 12:40:42 pm
content: A while ago I acquired an Agilent 8163B lightwave multimeter which gave a fatal error when powering up.It turned out that this fatal error was caused by someone having removed the compact flash card from which the instrument is supposed to boot...Some time later I was able to get my hands on the bigger brother of this unit, the Agilent 8164B, in order to clone the contents of the compact flash card and transplant it into my unit.After placing this freshly cloned compact flash card into my unit and flashing the correct firmware for the 8163B to the unit via ATTools (listed on the 8163B page from Keysight) the instrument appeared to boot up correctly, however the instrument reports that it is unable to find its model number and serial number and reports these as "<NO CAL DATA>!".In this state the instrument refuses to detect any modules which get inserted into the unit.What is strange is that when I connect to the unit via the ATTools utility which is used to update the firmware in the unit the model number of the unit is correctly identified.The compact flash card which was missing from my instrument contains two files, a BOOTROM.SYS file and a firmware image. The firmware image I was able to easily replace with the correct one for the 8163B, I'm however not sure if the BOOTROM.SYS file is the same between the 8164B and 8163B. This could be causing my problems.I'm wondering if someone would be able to create an image, or at least copy the BOOTROM.SYS file, from their 8163B compact flash card?This card is accessible via the module bay and is readable on a normal PC.Attached below are some pictures of what is displayed on my unit.

author: seebeck
author_rank: Contributor
timestamp: May 04, 2023, 11:14:14 am
content: Hi ddrl46,Attached are the BOOTROM.SYS file and SYSTEM.image for your reference.FW Version: V3.85You can find additional information in Keysight website, link as:https://www.keysight.com/us/en/product/8163B/lightwave-multimeter.htmlWith best regards.Seebeck.

author: ddrl46
author_rank: Regular Contributor
timestamp: May 05, 2023, 01:14:00 pm
content: Hello seebeck,Thank you very much for the files, after some more troubleshooting it turned out that the previous owner of this instrument has been messing with the EEPROM near the GPIB connector (AT24C64) on the mainboard.After copying the contents of the EEPROM from a working 8164B to my 8163B it was able to boot up correctly and identify modules as well.Only thing is that now the instrument identifies itself as a 8164B, but that is not a huge issue. I tried to edit this by modifying the EEPROM data, but it seems there is some checksum in there.
agilent 83711B CLIP - Page 1
Forum section: electronics / repair

author: RV
author_rank: Newbie
timestamp: August 23, 2016, 01:16:28 pm
content: I'm looking for 83711-60342 schematic.

author: clockspectrum
author_rank: Contributor
timestamp: September 29, 2018, 08:56:11 pm
content: Did you ever find this, I am also looking for this doc.Matt

author: ddrl46
author_rank: Regular Contributor
timestamp: September 30, 2018, 02:33:43 pm
content: The service manuals for the HP 83711/2A and 83731A/2A (And HP 70340A, since this module shares the same hardware) are available at Artek Manuals. These also include the 5060-7093 CLIP.Not sure what the differences are between the A and B versions of the instrument but you might be able to get quite far with these.http://artekmanuals.com/manuals/hp-manuals/

author: clockspectrum
author_rank: Contributor
timestamp: September 30, 2018, 07:44:12 pm
content: Great resource...Thanks! Just ordered the CLIP manual.Matt

author: John_ITIC
author_rank: Frequent Contributor
timestamp: October 28, 2021, 01:34:14 am
content: Hello, I'm considering picking up a not working HP 70340A for repair. But first I have to ensure I can find a complete service manual. In this CLIP manual from Artek, is there included the full service manual, or just the schematics? The Ebay listing says there are only 120 pages, which seems too little for a complete service manual.https://www.ebay.com/itm/370696650047Thanks/John.

author: vtp
author_rank: Regular Contributor
timestamp: October 28, 2021, 07:20:52 pm
content: Quote from: John_ITIC on October 28, 2021, 01:34:14 amI have that (70340-90010) and it's just the schematics including bill of materials and components placement pictures.83731-90131 service guide may be of help.
[SOLVED] Agilent 8648B reboots - Page 1
Forum section: electronics / repair

author: Cyclotron
author_rank: Unknown
timestamp: May 10, 2025, 02:42:21 am
content: This one is already solved, its a quick one to document what I found in case others find it useful.I purchased the Agilent 8648B on the eBay for a very reasonable price and it was sold as defective for parts/repair. The seller said whenever you tried to enable output it would reboot. When I got it, it wouldn't finish the power on selftest without rebooting.Immediately being suspicious of the PSU I took it out and hooked it up for load testing and so on. The testing immediately showed instability in the output. I couldn't get stable voltage from the 5, 15, or 38 volt rails even under the most light current load. And the PSU started ticking. It sounded like a relay clicking. I thought it might be the thyristor and was suspicious of a short. I also noted large amounts of ripple on the output of the PSU.The pictures tell the story, but in case you don't want to look, the negative leg of the main PSU capacitor appears to have never been soldered in place. When I took the backing plate off the PSU, I found a racing stripe. I took the CAP out and tested it. It tests low but I put it back in and soldered it and the unit works fine now. I will order a new CAP, replace it, and put this new tool to work.
Agilent 8714ET - Page 1
Forum section: electronics / repair

author: dalby
author_rank: Newbie
timestamp: July 15, 2025, 10:52:08 am
content: Hello. I have two Agilent 8714ET network analyzers, and one of them has an abnormal defect.When I perform a transmission calibration at 0dBm of generated power, the analyzer positions the curve at 0dB gain and everything works properly.If I vary the generated power to -10 or -20dBm, the response curve on the instrument shifts to -10 or -20dB. I should point out that the generated power is correct, having checked it with an 8594E analyzer.They have the same firmware and the same bootloader, so I don't understand this anomaly. The defective instrument is the one that was repaired after a year of waiting and with a different defect, and I would like to know if they did something wrong?Thanks for your help.
Agilent 8753ES A9 CPU Board repair - Page 1
Forum section: electronics / repair

author: inaxeon
author_rank: Regular Contributor
timestamp: January 11, 2022, 12:37:56 pm
content: Hey FolksRecently picked up this Analyser for a steal, but the CPU board is dud (I was aware when purchasing, and drove a hard bargain ;-)Does anyone know anything about it? I found a few old threads on the internets of others who have tried to diagnose these things without any luck. I've attached a picture of the 8 LEDs which apparently are diagnostic but the service manual has no table of what these mean, other than saying "Replace A9 CPU Board". Arrrgh.I made up a cable to attach it to a known-good ATX power supply outside of the instrument, same deal, same error code, so not a power supply problem. I'm thinking maybe dud DRAM or something but hard to prove without doing full logic analysis on it, would rather not unless I have to!Whatever it is, it is a very very early fault, it only cycles through maybe 2 or 3 codes before it bombs out.Thanks in advance

author: inaxeon
author_rank: Regular Contributor
timestamp: January 12, 2022, 01:42:52 pm
content: Have spent a bit more time on it. Don't really know much more other than it is executing a bit of the pre-bootloader then crashing out. Doesn't get anywhere near turning the screen on frustratingly.Cause still unknown.I whipped a quick PGA-179 pin spy PCB, currently with PCBWay. When I get it I'll hook it up to my 16702B and see what I can learn.

author: inaxeon
author_rank: Regular Contributor
timestamp: January 25, 2022, 09:19:49 pm
content: Back again, talking to myself ;-)The pin spy has arrived, made it up, and have been on the LA for an hour now.The CPU is stuck in an endless loop trying to write 0x55555555 to address 0x30000000 but reading back 0x55551555. Definitely looks like some kind of memory pattern test.It seems to be the four SRAM chips which respond to this address, specifically it's the SRAM U111 which appears to be the culprit, at least as far as I can see. A little surprising to see a dead SRAM. I'll replace it and see what happens. Next post probably 3 weeks away when that arrives.

author: Teichhermelin
author_rank: Regular Contributor
timestamp: January 25, 2022, 10:49:28 pm
content: That's what logic analyzers are for. Looks like a plan...;-)Keep us informed

author: inaxeon
author_rank: Regular Contributor
timestamp: January 26, 2022, 09:53:40 am
content: haaaaaaaaaa!I found some suitable SRAMs in my parts box. Not quite the right package, but just fits.It's alive!Full write up:http://www.mattmillman.com/acquisition-and-repair-of-an-agilent-8753es/

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: January 26, 2022, 03:13:45 pm
content: Congratulations!!!Great work, troubleshooting, and determination.Quite impressive.

author: inaxeon
author_rank: Regular Contributor
timestamp: January 26, 2022, 07:31:03 pm
content: Quote from: SoundTech-LG on January 26, 2022, 03:13:45 pmWell thanks. I am hoping my experience will inspire more people to attempt to repair these. It is a shame to see people forking out $900 for a used board when an entire instrument can be had for $2000!
Agilent  8753ES  A9  U316  configuration file ？ - Page 1
Forum section: electronics / repair

author: Wade2019
author_rank: Contributor
timestamp: May 07, 2023, 04:44:42 pm
content: When I was repairing 8753ES, I accidentally damaged U316. It is a Lattice CPLD model MACH221 7JC -10Ji. I am regret because it needs to burn the project configuration file to runProgram Name: Agilent 08753-80173
Agilent 8753ES shows up arrow and P? - Page 1
Forum section: electronics / repair

author: wd5jfr
author_rank: Regular Contributor
timestamp: February 16, 2025, 06:20:36 pm
content: I found one that has these indications on the left side of the display on the S11 screen. I can't get any more info. Does this indicate that there's a pretty good likelihood that the source is bad?ThanksHank

author: wd5jfr
author_rank: Regular Contributor
timestamp: February 17, 2025, 12:42:48 am
content: Here's a pic of the up arrow & P?.. What do they mean? If I look closely I can see in red what might be the beginning of the word CAUTION. Any ides appreciated.ThanksHank

author: wd5jfr
author_rank: Regular Contributor
timestamp: February 18, 2025, 07:18:43 pm
content: The obliterated message is: Caution: No IF found: Check R Input Level.Could this mean a bad YIG?ThanksHank

author: wd5jfr
author_rank: Regular Contributor
timestamp: March 23, 2025, 05:35:56 pm
content: It's a defective Source.
Agilent 8920B repair - Page 1
Forum section: electronics / repair

author: Anteos
author_rank: Newbie
timestamp: December 25, 2023, 02:22:02 pm
content: Hello everybodyI have Agilent 8920B which started to show several glitches:1. When starting, it shows sometimes the "error 0040" which is in called in Assembly Level Repair Manual "Real-Time Clock" problem on A8 Memory board. I have just replaced dead 3V battery, but it does not help at all.2. When connected to LabView, Sometimes it shows "Battery Backed RAM initialized. Standard RAM not Maintained". After clicking OK it starts normally.Any suggestions?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 25, 2023, 03:20:21 pm
content: could be the case of some nvram battery who died and you lost some cal values, meaning its no longer calibrated, try to find if you have some coin cel battery, any battery or some Dallas ic's
Agilent dso 8104a dead motherboard replacement - Page 1
Forum section: electronics / repair

author: super_electron
author_rank: Contributor
timestamp: March 23, 2022, 04:44:45 am
content: Looking for suggestions on a replacment motherboard for Agilent 8064A motherboard. The scope uses standard Intel D915GUX with a custom Bios. Do you guys think replacing the bios chip from the scope's defective motherboard to a standard desktop PC D915GAG would work ?

author: Venturi962
author_rank: Regular Contributor
timestamp: March 23, 2022, 10:48:39 pm
content: I believe any Motherboard / CPU combo that supports Windows XP (and fits) would be easiest. PC is generic - nothing special in the BIOS. Folks have also upgraded to these to Windows 10 in the past but that's a bit more involved.

author: super_electron
author_rank: Contributor
timestamp: July 29, 2022, 03:20:52 am
content: Does anyone know if there is bios update for Intel D915GUX in Dso8000 oscillscope available from Keysight ?
Agilent DSO 6032A KEYPAD NOT WORKING - Page 1
Forum section: electronics / repair

author: super_electron
author_rank: Contributor
timestamp: April 08, 2021, 04:40:13 am
content: I have Agilent dso 6032A with strange problem. After power ON none of the keys on the front panel respond. The following things has been already tried.Any insight to this issue and help will be greatly appreciated.- The scope is fully controllable using eathernet and the web browser.- The voltages on the keyboard PCB seems to be in range.- Tried a different keypad ribbon cable without any success.- No other issues with the scope. Using web browser both channels read correct voltage and the frequency from the input signals.

author: Teichhermelin
author_rank: Regular Contributor
timestamp: April 08, 2021, 09:32:22 pm
content: Take a look at the foil cable. It could be that it broke at the kink. Wouldn't be the first device where this appears.

author: super_electron
author_rank: Contributor
timestamp: April 11, 2021, 01:50:32 am
content: What foil cable ? If you mean ribbon cable then I already have tried swapping with one from a different scope but the result were the same (none of the rubber push button key on the front panel work.I did notice one of the filter cap on the ribbon cable connector on the main mother board have unusually low resistance (55 Ohms) compare to the others which are in couple of kilo Ohms range. Pictures are attached.- Does anyone have the pinout of the ribbon cable connector (j2602)on the main board.

author: super_electron
author_rank: Contributor
timestamp: April 29, 2021, 03:28:19 am
content: Some more updates on the debugging efforts on this issue. I was able to compare the front panel keypad interface of the DSO6032A with a know good DSO6054A. All the voltage level seems to match except the 2 pins highlighted in the picture. 2V7 on a 3V3 logic level interface does seems to indicate a hardware issue. Not sure what this signal are ? I have not been able to trace them to back to the component generating these signals. Any help identifying these 2 pins in the pictures will be greatly appreciated. Even a system level blockdigram will be very helpful.

author: KE5FX
author_rank: Super Contributor
timestamp: April 29, 2021, 03:43:23 am
content: Good chance one of those tantalum caps is shorted. You've checked them all?
Agilent DSO-X 2012A - Page 1
Forum section: electronics / repair

author: cskarto
author_rank: Newbie
timestamp: May 18, 2024, 11:17:58 am
content: Hello,Our DSO-X 2012A oscilloscope has a boot problem. I have attached a short video. What might the problem be? Any advice? Thanks in advance.Cskarto
Agilent DSO-X 3000a (3034a) Repair issues - Page 1
Forum section: electronics / repair

author: sahko123
author_rank: Frequent Contributor
timestamp: May 19, 2023, 11:24:57 am
content: As seems to be a very common problem my DSO-X 3034A doesnt work......The VP23V line which ends up being the lcd bias line is at 0V which may, or may not be a consequence of the NAND corruption and a low enable line. I wanted to know if keyisght were still accepting the NAND corruption for free repair?And if not how would i go about repairing the firmware?The full list of symptoms is,1. VP23V is at 0v2. The front panel LEDs come on and flash once and then just stay on in some slightly random pattern.3. the front panel pcb is receiving 0.7v on the 13v line which i sent over through a mosfet which isnt turned on.4. The scope doesnt boot at all and isnt detected over usb.

author: m k
author_rank: Super Contributor
timestamp: May 23, 2023, 08:07:48 am
content: One would expect that in this case a machine with corrupted memory is not random.Random here is more like no memory.How are other voltages?

author: HighVoltage
author_rank: Super Contributor
timestamp: May 23, 2023, 09:12:46 am
content: Quote from: sahko123 on May 19, 2023, 11:24:57 amBest to contact KeysightAs far as I know, they are still accepting NAND corruption repair free of charge.But you have to send the scope first to Keysight for inspection.
Agilent DSO-X 3024A line filter board not working - Page 1
Forum section: electronics / repair

author: eugen_m2
author_rank: Newbie
timestamp: July 12, 2022, 07:22:17 pm
content: Hello, i have an Agilent DSO-X 3024A, does not boot up, only 3 leds stay lit on the front panel.when i measure on the PCA - Line Filter Board i can see a stable 13V on the input side and on the voltages output the values are well below the +/-3% ( i can see the 5V rail at 4,64 and dropping)i guess there is an issue with a protection circuit, but i cannot figure out to many as i cannot find teh specifications of all the iCsPCA - Line Filter Board cod 75019-26424

author: m k
author_rank: Super Contributor
timestamp: July 19, 2022, 01:55:20 pm
content: Agilent DSO is not very nice repair environment.Have you looked around the forum, some others have also had some power issues.Since the actual power is single output only there most likely are some DC/DC converters for other voltages.If 12V is high and 5V low and dropping maybe one of those converters are overloading or is overloaded from the other side.
Agilent DSO1004A a repair attemp - Page 1
Forum section: electronics / repair

author: Lilf
author_rank: Newbie
timestamp: August 31, 2023, 04:18:52 am
content: Hello everyone,I have an Oscilloscope Agilent DSO1004A, channel 2 behavior is strange. The sinewave appear with a lot of noiseI connected Function Generator 1Khz sinewave directly to channel 2 with BNC to BNC cable. I change the BNC cable and still got the same result, I also connected a different F.G and had the same result all of the other channels are good. I teardown the DSO1004A to do an inspection of the BNC connector to the board, I check continuity it looks good. I'm thinking the connector itself maybe got damaged, Does anyone had something similar? Do you have any tips how should I proceed.Thank you very much.

author: Kleinstein
author_rank: Super Contributor
timestamp: August 31, 2023, 08:34:53 am
content: The error does not look so much like an analog problem, but more like a digital problem, like 1 bit from ADC not reaching the destination. It may help to do a few more tests, maybe with a larger amplitude and maybe other ranges / DC shift.

author: Lilf
author_rank: Newbie
timestamp: August 31, 2023, 08:14:46 pm
content: I appreciate your input, I will defiantly do that and keep posted with the result.

author: Lilf
author_rank: Newbie
timestamp: September 06, 2023, 09:36:23 pm
content: I tried to change the amplitude higher and lower and the dc offset, also, I change between sine, square, pulse and get the same result. The noise appear suddenly out of no where. I attached video a short video that shows the signals with noise and after seconds the noise is gone it goes into a loop.
Agilent DSO3062A Oscilloscope Issue: Black Screen and Red Run/Stop & Single Butt - Page 1
Forum section: electronics / repair

author: nunolopez
author_rank: Newbie
timestamp: November 15, 2024, 09:24:24 pm
content: Hey everyone! I have an Agilent Technologies DSO3062A (60 MHz) digital storage oscilloscope that I recently powered on, but I’m running into some issues. When I turn it on, the screen stays completely black, and both the Run/Stop and Single buttons are red. As far as I know, red on these buttons means data acquisition is stopped, but I’m not sure if there’s a deeper issue at play.Has anyone encountered this issue with this model before? I’m comfortable with basic electronics repairs, but I’m not sure where to start troubleshooting. Any advice on what might be causing the black display and if this is something I could potentially fix

author: hanakp
author_rank: Regular Contributor
timestamp: November 17, 2024, 08:57:53 am
content: These scopes were actually made by Rigol, you can see their logo if you remove one channel shielding box. Agilent/Keysight does this a lot with their basic products lately. (So much for "premium" instruments). I encountered a similar issue like you - one day, the scope suddenly didn't boot. My screen worked however, it displayed the logo, buttons lit up, but then the scope froze. Is the screen really dead? Does its backlight work?Anyway, I tried to un-brick "my" scope back then. The problem is, if the scope doesn't boot, you can't write new firmware. So my plan was to dump Flash contents from a working scope and write it to the bricked one. The scopes are based on Analog Devices ADSP-BF531 Blackfin DSP, so I borrowed an emulator to do that. But I quickly hit a wall, I could dump only about 1/4 of the Flash. The Flash is external and to access it, you have to provide the emulator with a specialized hardware configuration file. Normally, SW designers have to create it before they start their work, but of course I didn't have it. Plus, I've never used Blackfins and it would require reverse-engineering Flash addressing scheme. I actually knew a guy who could help, but he was quite busy and the scope simply wasn't worth our combined time to do it.BTW, the scope also contains Altera EP1C6Q240C8N FPGA, but I don't think it has separate configuration Flash. I assume its contents are part of the main Flash firmware and it's configured from the Blackfin CPU once the CPU boots.
Agilent DSO3062A wont boot - Page 1
Forum section: electronics / repair

author: bsgd
author_rank: Regular Contributor
timestamp: March 25, 2020, 03:55:44 pm
content: Hello all,I'm facing a problem with my Agilent DSO3062A scope. It was working fine and all of a sudden it wont boot anymore. Panel lights keep flashing quickly and internal fan keeps trying to start.This seems like a typical SMPS hiccup problem, so I removed the power supply and checked all electrolytics (they are fine) and diodes (tested fine too). I dont have any schematics or service manual (could not find them) so Im lost at what to do now.I have completely diconnected the power supply from the scope and was able to measure +5, +22v (no load) and some other voltages, but since I dont have any schematics Im not sure what voltages to look for at which pins. The PS does output steady voltages without load, but hiccups whenever its connected to the scope logic board.Any help is greatly appreciated

author: bsgd
author_rank: Regular Contributor
timestamp: March 25, 2020, 04:08:17 pm
content: Here is a picture of the SMPS:

author: CodingMarco
author_rank: Contributor
timestamp: April 11, 2020, 10:19:27 pm
content: Is there any other number on the board than DSO3000 Series Power Supply? Possibly a part number beginning with 0950-...?

author: Manul
author_rank: Super Contributor
timestamp: April 11, 2020, 11:07:49 pm
content: There may be a failure on the logic board. Would be good to check all power rails on the logic board for shorts. Also outputs of local converters/regulators if they exist. In addition to resistance check, I personaly like to use diode test mode of a multimeter to observe how a power rail behaves.
Agilent DSO3202A - Page 1
Forum section: electronics / repair

author: Select-test
author_rank: Newbie
timestamp: October 16, 2020, 09:28:44 pm
content: Hello Everyone,I have an Agilent DSO3202A and 3 of the controls go wacky(see Pic). In other words, are not linear. I dismantled the keyboard but couldn't find the part #. Would anyone know what part # these are ?Thanks for any assistance.Martin

author: kubark42
author_rank: Contributor
timestamp: May 16, 2022, 03:02:31 pm
content: I had a similar problem on an Agilent DSO1002A, only it was the time and voltage scale buttons. Spraying in contact cleaner cleared things up right away. I don't even need to take the scope apart, it was enough to full firmly on the knobs to remove them, and then guide the contact cleaner in around the exposed shaft. I gave each knob a few whirls, pushed the button a time or ten, and it cleared right up.Did the same with the push buttons and they started behaving a lot better, too.
Agilent DSO80000B - repair acquisition board - Page 1
Forum section: electronics / repair

author: jmonette
author_rank: Contributor
timestamp: July 27, 2023, 01:46:08 pm
content: Hello,I have a DSO80604B that I bought recently and it fails it self-test and self cal. I was wondering if any of you have any idea what could be the culprit. So here it is.When I run the self test, I get a failure on Acq Memory test Group (others are PASS)Then When I run self cal channel 3 and 4 fails. The detail shows (picture included)Chan3 Vertical errorsPere40 (No idea what it means)Pere40 (No idea why it's there twice!)Pere AbsTime FixChan 3 Trigger errorsAnalogPath SkewTrigPath SkewAnd everything is the same for channel 4.If I run after the self test, I get the same failure as the first time.Then I went and checked every channels. 1 and 2 are normal 3 and for are extra noisy. Weird part, if 3 and 4 are enabled at the same time, 4 is a bit less noisy. Also, if 1 2 and 4 are on at the same time, 4 is a bit less noisy. If only 1 or 2 is on, the noise on ch4 seems to be the same.According to the service manual, the fix for that is to replace the acquisition board. I'd like not to go there since, I don't have the money to (personal equipment!)Does any of you have any ideas how it could be fixed? Or anything you'd check?Thanks

author: HighVoltage
author_rank: Super Contributor
timestamp: July 28, 2023, 12:49:48 pm
content: Always start with all power rail voltages and ripple.Since you have working channels, you can compare each signal path and compare values with a second scope.

author: jmonette
author_rank: Contributor
timestamp: July 31, 2023, 03:44:45 pm
content: I had in mind starting by the acquisition side, but you are right that PSU might be the issue. It is a fairly huge PCB! Without schematic, it will be a challenge. That's one of the reason I post it on here, if any one has any info on these acquisition board, I'd love to hear them! Thanks for the advice!

author: KE5FX
author_rank: Super Contributor
timestamp: September 24, 2023, 08:47:22 pm
content: Any luck? I'd be tempted to look at the board with an IR camera, to see if I could spot any obvious asymmetries between the channels.
Agilent DSO81204B startup error issue - Page 1
Forum section: electronics / repair

author: zfq119116609
author_rank: Newbie
timestamp: September 18, 2024, 03:05:17 am
content: Program startup error: Channel 1 TRIGGER damage self-test is good, calibration cannot be checked. The voltage of the acquisition board is normal. Does anyone know what the problem is?
Agilent DSOX2022A won’t load - Page 1
Forum section: electronics / repair

author: JoeB83
author_rank: Regular Contributor
timestamp: March 28, 2021, 11:40:01 am
content: Back with another problem, this time my DSOX2022A won’t load. When I hit the power button some of the front panel lights turn on and a few seconds later the Agilent load screen shows, then front panel lights cycle infinitely. I tried loading the firmware onto a USB drive and the same thing happens, only with the Agilent logo instead of the standard load screen. I’m hoping it’s something fixable by me but I have a feeling I’m either going to have to send it to Keysight for repair or sell it as broken. I’ve included two YouTube links so you can see what it’s doing.Attempt to load with no USB with firmware:https://youtu.be/IvfEGOL7GaUAttempt to load with USB and firmware loaded:https://youtu.be/vETqq8jvtOEEDIT: I forgot to mention I did look at the service manual, and there’s no mention of a no-boot condition.Thank you so very much for any info at all.

author: Bud
author_rank: Super Contributor
timestamp: March 28, 2021, 01:14:26 pm
content: Looks NAND corruption problem, ask for an advice in the 2000/3000 hack threadhttps://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/
Agilent DSOX3024 Oscolloscope not working - Page 1
Forum section: electronics / repair

author: Sal
author_rank: Newbie
timestamp: January 28, 2022, 03:12:55 pm
content: I have an Agilent (HP) DSOX3024 scope and I hadn't used it for a few months and went to power it on and and it flashes a few lights and stops with 2 green LEDs Math & Ref on and does nothing. It does power on maybe once every 20 or 30 times, it's obviously a power up reset problem because when it does power up it's fully functional. It's about 7 years old in perfect condition. Has anyone seen this before or do I need to send it to get reapired?

author: TheSteve
author_rank: Unknown
timestamp: January 28, 2022, 06:09:25 pm
content: This is a very known issue with NAND flash memory corruption. There are many threads detailing the problem. Generally it is fixed by updating the firmware. So if you can get it to fully boot installing the newest firmware is the way to go.

author: Sal
author_rank: Newbie
timestamp: January 28, 2022, 08:56:51 pm
content: Thank you I will give that a try.

author: Sal
author_rank: Newbie
timestamp: February 14, 2022, 01:11:04 pm
content: Thank you so much Steve, I got it to boot after several power ons. I dowloaded the current V2.65 firmware file and updated it and fixed the problem. Strange how I had this problem after 7 years, if, as you say it is a known issue, I wonder if other people have had this problem more frequently.

author: TheSteve
author_rank: Unknown
timestamp: February 14, 2022, 09:04:31 pm
content: Quote from: Sal on February 14, 2022, 01:11:04 pmGlad to hear you got the updated firmware installed. There are actually many threads here on the problem and details on how to fix the scope if it won't boot at all. Keysight changed aspects of the firmware to mitigate the problem several years ago. For a time they were also repairing units for no charge.
Agilent E3615A Voltage dropouts - Page 1
Forum section: electronics / repair

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: June 27, 2023, 12:01:22 pm
content: Hello!Please, see a video what happens from time to time on my E3615A PSU.https://easyupload.io/6y57luSometimes voltage readout fluctuates from almost 0V to set 12V.What could be the cause of the problem? Bad caps maybe?Thank you in advance!Kind Regards,HrvojeP.S.Sorry for shaky video again

author: lecatron07
author_rank: Newbie
timestamp: June 27, 2023, 02:29:18 pm
content: from the video it looks like the device enters CC mode for some reasonin the video i didn't see but does the PSU CC led light up while fluctuating like thisif yes it seams like the current read circuit or a bad connection terminal from inside

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: June 27, 2023, 06:45:58 pm
content: Quote from: lecatron07 on June 27, 2023, 02:29:18 pmHi there!No, CC led does not light up while fluctuating.

author: lecatron07
author_rank: Newbie
timestamp: June 29, 2023, 02:19:36 pm
content: try connecting a scope and see what relay happens at the outputto separate the problem from digital to analogand troubleshoot using this dochttps://xdevs.com/doc/HP_Agilent_Keysight/HP%20E3614A%2C%2015A%2C16A%2C17A%20Operation.pdf
Agilent E3616A PSU has shortage - Page 1
Forum section: electronics / repair

author: HighVoltage
author_rank: Super Contributor
timestamp: March 25, 2021, 04:13:00 pm
content: This E3616A PSU has suddenly turned off and the 1A fuse is blown.This PSU is used on 230VThe problem is around the power resistor R1, because it is overheating.Removing R1 stops the short.R1 is 0.6 Ohm and from the looks around 10WI checked the surrounding components in the trace and can not find the problem.Enclosed is the schematic.Anyone here have some ideas what the problem might be or what the next step would be?Thanks for any help.

author: pqass
author_rank: Super Contributor
timestamp: March 25, 2021, 05:12:03 pm
content: R1 and R2 are for leveling the current through the main series MOSFETS Q1 and Q4. A low, sub-ohm value is expected.If you've removed R1, replaced the fuse, and turned it on again without issue, then it may indicate that Q1 has been permanently shorted. Remove Q1 and test it.
Agilent E3631A  - Page 1
Forum section: electronics / repair

author: k1mgy
author_rank: Regular Contributor
timestamp: July 14, 2019, 05:55:06 pm
content: Can anyone with an Agilent E3631A confirm the part installed as U5 in the A to D section?The manual does not list a part number for it.In my semi-broken E3631A (ebay) U5 has the same part installed as U4 (74HC4051). I don't believe U5 should be that part.. so it looks like a repair gone wrong.To access this, slide the unit out of the case, remove the two screws holding the hinged section, and open the top board. U5 is near the back, to the left of the 5V regulator.

author: k1mgy
author_rank: Regular Contributor
timestamp: July 14, 2019, 06:09:51 pm
content: Whoops. Seems when ever I ask a question, the answer appears!https://doc.xdevs.com/docs/HP_Agilent_Keysight/E3631A/Unit_2/img/001/DSC_4788.jpgIt's a 74HC4053D 3x 3 ch mux/demux.. and some IPA, a microscope, and just the right angle reveals that the part installed in U5 is indeed the 4053D. The 3 sure looked like a 1!

author: ArthurDent
author_rank: Super Contributor
timestamp: July 14, 2019, 06:58:14 pm
content: Have you watched this repair video of the HP e3631A ??

author: k1mgy
author_rank: Regular Contributor
timestamp: July 14, 2019, 08:14:02 pm
content: Yes, it was very helpful.Upon further examination, the COMP pin is toggling, consistently regardless the position of the LIMIT button, and this makes it further down stream. FLASH, however, is pulled to the negative rail at all times, and CR3 keeps it at -0.65 V going into the microprocessor (thank goodness). So I think my problem is in the FLASH chain.I found several resistors in the ADC that were open circuit.. which I suppose is not all that strange for a unit so old. They were all the 0.1% types with green colouring. May have been a bad batch? The rest seem fine.. but haven't checked the caps yet. Doubt bypassing would cause this kind of failure.It seems probable that when the LIMIT switch is activated, I'm reading on the front panel the *desired* output.. and when LIMIT is NOT activated, the front panel displays the actual sampled voltage/s. Makes sense...
Agilent E3632  - Page 1
Forum section: electronics / repair

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: November 16, 2024, 11:48:07 am
content: Hi!I have noticed that sometimes during power up sequence my E3632 beeps twice (which is normal), but display shows only "OUTPUT OFF" and after few seconds other parameters appears (selected range, etc.).Why does my power supply do that?Thank you in advance!Kind Regards,Hrvoje
AGILENT E3632A - CORRECT FAN POSITION - Page 1
Forum section: electronics / repair

author: Ussovak
author_rank: Contributor
timestamp: June 07, 2020, 02:15:31 pm
content: Hi everyone,I saw in various post many had questions regarding the Agilent E3632A series PS and the correct direction of air flow and mounting of the fan. I too bought one of Ebay and I also noticed my fan was mounted with air blowing into the case. I believe this is incorrect.The User manual clearing says how the fan operates. The air is pulled through the side vents and blown out the back of the unit. See capture from manual below.Makes most sense. Why would one want hot air to be blown towards the front of the case. This would heat up all of the components and the VFD.

author: pigrew
author_rank: Frequent Contributor
timestamp: June 07, 2020, 04:18:15 pm
content: Huh, I hadn't contemplated the fan direction on these units.I just checked an E3631A (had a failure in its voltage reference circuit, a resistor was open, IIRC), and it pulls air INTO the back and OUT the sides. The E3631A user manual says that it should blow out its sides (as it does). The E3633A manual states the same as the E3631A. I'm not sure why they would specify it one way on one model, and the opposite on the others.One advantage of the fan sucking in air is that a filter could be fitted externally, but I don't think that was ever an option for the E363xA series. Perhaps they also want to keep the fan cool? Sucking in the back means that the hot air won't heat the fan motor.

author: Ussovak
author_rank: Contributor
timestamp: June 07, 2020, 04:53:07 pm
content: It's in the E3632A manual as I described. And think about it, - these units also have a rack mount option. Would one really like to pull the extremely hot air from behind the rack and send it out the sides? They say it won't matter but anyone who's worked with rack mounted equipment knows that temps can get really high.Not sure why E3631A would be any different but per the manual, they are different.

author: Kwakerman
author_rank: Regular Contributor
timestamp: June 09, 2020, 05:50:03 am
content: The power transistor heatsinks are normally mounted close to the fan, cooling is probably better if directly behind fam blast rather than from air being drawn in from surrounding area within the case?

author: Taimer81
author_rank: Regular Contributor
timestamp: May 04, 2025, 10:32:14 am
content: What do you think? It may be worth considering connecting the fan to the radiator temperature, as well as the very strong airflow and noise.

author: madao
author_rank: Frequent Contributor
timestamp: May 25, 2025, 03:21:05 pm
content: Honestly, my both E3632As fan is blowing inside. One E3632A has agilent warranty sticker on rear (it was never opened )
Agilent E3632A output buffer overflow  - Page 1
Forum section: electronics / repair

author: Hrvoje_CRO
author_rank: Regular Contributor
timestamp: November 09, 2019, 05:12:56 pm
content: Hello!What exactly does it mean error 522 output buffer overflow?It happens on mine e3632a when i recall setting and turn off power supply then switching it on?The power supply pass the all tests btw. And it seems that is nothing wrong but what makes me concerned is this above.Thank you!
Agilent E3632A "Repair" - Page 1
Forum section: electronics / repair

author: juro
author_rank: Newbie
timestamp: August 24, 2021, 04:39:36 am
content: Hello everybody.I'm Khanh. i come from Vietnamese. I'm fixing my Agilent E3632A.There is 1 problem with "led panel" IC U7 - EE8051BH is short circuit VCC- GND.I hope someone can show me where i can get U7 firmware or read U7 firmware and send me a coppy.Thank you.

author: chekhov
author_rank: Regular Contributor
timestamp: August 24, 2021, 10:11:43 am
content: This may help -https://www.eevblog.com/forum/repair/agilenthp-e3646a-repair/msg1152365/#msg1152365

author: juro
author_rank: Newbie
timestamp: August 25, 2021, 04:15:06 am
content: Chekhov, thank you for your help. I will try but I don't think E3646A will work with E3632A.

author: kjk24
author_rank: Regular Contributor
timestamp: September 04, 2021, 11:37:34 am
content: Hi,i have exact the same issue, i replaced the Ic with a AT89c51RC2 with the Firmware n80c51bh_E3633A_Display_Board from a nice member here in the forum (thank you for the file) , the Tool what i used for flashing is Flip from Microchip "FLIP 3.4.7.112 for Windows" with Serial programming on a breadboard.i tryed to programm it with a TL866 Pro a brand new and a older Version but it wont programm it? i dont findout why.maybe someone have a Agilent E3631A file for me?my Display CPU wars also short (and hot),the display is now dark and the PS beep one time if i switch it on, 5V on the Displayboard are ok.Replaceing the Display driver IC not helped.If a Button is pressed sometimes the unreg. will light thats all what it dose.The unit Selftest (switchon with button pressed) do nothingThe Bias Supplies on my are ok.the Display get IGFPSCK 8Bit clock packages one per second or so from the Main CPU and the display answer with some data onFPDO. But no IGFPDI and no IGFPINT signals, U8 looks okHave you more ?regardskai

author: kjk24
author_rank: Regular Contributor
timestamp: October 31, 2021, 04:10:42 pm
content: Hi,after a while i repair'd the unit, defect wars the RAM chip too.before changeing the RAM i replaced the CPU, the eprom without succes.