hybridfree/eevblog-posts huggingface dataset:
hp omen 15-dh1015nl does not turn on  - Page 1
Forum section: electronics / repair

author: giulio93
author_rank: Newbie
timestamp: March 29, 2025, 07:43:27 pm
content: Hi everyone, I'm new and I hope you can help me and I can be an active member of your communityI have this gaming laptop that no longer works. Some intro: a little metal screw fell of the mobo in the battery zone ( i'll upload the photo). After that the pc suddenly shutted down. I disassemble it and take some measurments. I have a lab supplier and a thermocam. I tryed to connect the power cable and I see this Intersil chip went up to 85 deg (at 19V).I took some measurments around it and notice that some line were shorted, so i unsoldered the chip and take the measurments again, now no longer short. Then i measure the nearby mosfet and i found it shorted so i unsoldered it to. I replace both chips.I tried to connect the battery but it went immediatly to 0V. Then i bought a new one (compatible not original) and plugged in. Now the new intersil chip seams to work cause I measure 5V, 3ish V and 1V aroun it. (Also a 6V).But the mobo still doen't start. I mesure the gate at the first 2 mosftet and is at 0V so close, then the 19V doen't pass this point and I know this is a problem :'(Can you help me finding the problem? Which chip is the driver for the first 2 mosfs? Is it the Intersil or some ON around the mobo? (The burnt connector is coused by the unsoldered procedure, it was fine before)I will really appreciate your help.Thank you so much

author: giulio93
author_rank: Newbie
timestamp: March 30, 2025, 12:47:06 pm
content: I can't see the pics I upload. I re-upload them here

author: giulio93
author_rank: Newbie
timestamp: March 30, 2025, 01:20:58 pm
content: i measure the V at the VCC of the ONCP81215P and ONNCP81611 and it is 0. Se they are not powerd

author: giulio93
author_rank: Newbie
timestamp: March 31, 2025, 03:38:05 pm
content: I think I understand the driver for the first 2 mosfs is the Intersil chip but I don't have the schematics! I don't understand if it is working properly or not

author: giulio93
author_rank: Newbie
timestamp: April 02, 2025, 10:39:50 am
content: Update, checking all the pins i burnt the ISL chip and replace it. Now I have the 25V on the first Mosfs!!!! I report anyway the pin's V ( the 3 missing was too risky to measure)PIN 1 = 2,666VPIN2 = 0,06PIN3 = 0,06PIN4 = 0,06PIN5=0,03PIN6=0PIN7=0PIN8=0PIN9=0PIN10=0PIN11=5.3PIN12=0PIN13=0PIN14=0.06PIN15=0,06PIN16=3.14PIN17=0.99PIN18=19.6PIN19=5.24PIN20=5.24PIN21=PIN22=0.06PIN23= START FROM 1.3 DOWN TO 0.2PIN24=4.9PIN25=0PIN26=0.03PIN27=17.3PIN28=12.11PIN30=PIN31=19.98PIN32=19.98Now I have tried to connect the mobo at the pc chassic with some flat, but no power on and no charging light. The battery is at 11.4 and when I plugged the power cable goes to 11.9V but doesn't go up and no charging light. I measure around the I/O chip and I detect no V. What should I chek now?Thanks for your support I REALLY appreciate it

author: giulio93
author_rank: Newbie
timestamp: April 02, 2025, 04:19:38 pm
content: Here the pics of the solder joints. They seam fine to me, isn't it?[ Specified attachment is not available ]
HP oscilloscope board - Page 1
Forum section: electronics / repair

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: July 30, 2023, 08:44:16 pm
content: I have an HP1660ES logic analyzer. This has a 2 channel 500 MHz oscilloscope as an optional board to upgrade from an e to es. (HP E2460ES)https://www.keysight.com/us/en/assets/9018-41112/installation-guides/9018-41112.pdfWhen this board is connected with the 60 pin ribbon connector to the logic board (and CPU) of the logic analyzer the device doesn't boot.I checked that the power supplies are not altered when the board is connected.I presume this board was also used in other devices or was similar to other oscilloscopes of the era.Does anyone recognize the board as being similar to that found in HP oscilloscopes of the late 90's?I'm hopping to find some better repair / schematics documentation, for a similar oscilloscope, than are available for the logic analyzer.Michael
HP Pavilion Touchsmart 23: Not turning on - Page 1
Forum section: electronics / repair

author: keerthi123
author_rank: Contributor
timestamp: September 11, 2020, 04:32:31 am
content: Hi,Trying to fix a HP Pavilion Touchsmart 23. and found that power (3.3V) comes to ON switch. Also 5.3V is available in some places. MOSFET were check and some of them are working. But not turning on and no power in buck converters near CPU.In attached photo (this is near the power jack) in that buck converter. Top MOSFET voltage is 19.6 and outout is 0V. Bottom MOSFET no voltages in S or D. Is this a problem with IC with lable "J8 FD H15"? The big aluminium colour component is a coil. What could be the problem. I check a datasheet for "J8 FD H15" and couldn't locate it.Couldn't locate the schematic of the board.Appreciate a support.

author: perieanuo
author_rank: Frequent Contributor
timestamp: September 13, 2020, 01:13:26 pm
content: hi,usually the supervisor IC test the outputs from shorts and if it's ok, he 'validates' the 19Vcheck all regulators from short and eliminate if you canor just 'validate' yourself the 19V after identifying the correct mosfet and connecting D-S directly, the other one is for discharging.if you find some voltage with short circuit, just inject that voltage from a good and powerful supply (that means something like 8A current capability, that's what it takes to burn a shorted capacitor) after disabling eventually the voltage regulator of your mobo.you're gonna have the surprise to see the damaged part popping up in 2 seconds.seems risky, it's not, I've done it in a repair shop on lots of mobos with almost 100% success ratesometimes I just bypassed the mosfet who validates the main supply and all came to life.but usually it was a short involved on some supply rail.in rare cases an regulator IC was to be replaced, but with some ic's this is not impossible.study the datasheet of each regulator for good understanding on where you can inject the voltage and how to cut the regulator output on moboyes, it takes time.but 120 euros mobo also takes time...regards,pierreps:apparently it's not 19V validation issue, more a shorted small voltage power rail (you said you have some of the smaller voltages present).Identify which voltage is it, apply coresponding voltage, find shorted cap.finding the voltage it's not so complicated, trace the rail to the 'consumer' IC/module and then, that's your voltage (it depends on your finding, but not really complicated, may be prcessor or usb or whatever)

author: keerthi123
author_rank: Contributor
timestamp: September 13, 2020, 09:15:53 pm
content: Thank you. I will follow rails again. Once I did it and not found any short to ground rails. I guessed that IC sent the trigger to MOSFET is bad. May be that is not the issue.
HP power supply E3616A does not adjust to 0V - Page 1
Forum section: electronics / repair

author: prutser
author_rank: Regular Contributor
timestamp: October 04, 2023, 07:33:12 pm
content: I have an HP E3616A power supply which does not adjust down to 0V. ( somwtimesInitially I expected some negative voltages being not present or too low, but this is not the case.It is also not the voltage potmeter. Initially when I switch it on it remained around 3..4V Now after a while it's around 200-300mVso it might be temperature related.Before I start digging further, by coincidence someone who experienced this problem ?

author: Stray Electron
author_rank: Super Contributor
timestamp: October 04, 2023, 09:47:54 pm
content: I have no experience with the E3616 but the E3631A has KNOWN issues with bad ICs and bad resistors and there are some repair threads on this forum.

author: prutser
author_rank: Regular Contributor
timestamp: October 05, 2023, 05:57:50 pm
content: Thanks for the reply, I checked it, unfortunately it seems a completely different model, so I will start digging

author: fmashockie
author_rank: Frequent Contributor
timestamp: October 06, 2023, 12:48:21 pm
content: I just fixed a HP E3612A which is slightly different than the E3616A. I have attached a service manual for this power supply below. It provides a schematic and a bunch of troubleshooting tips and procedures to try. If you are getting only high output voltage, it could be a problem with the series pass transistors (Q1 and Q4). Or there's potentially something wrong with the preregulator SCR circuit.The issue with my E3612A had to do with current control. It would always limit the current to 60mA even when set to the higher settings (0.25A and 0.5A). The problem was a shorted 2N2222A transistor in the series pass circuit.Also, always check the snap action button switches on old test equipment (not sure if yours has these but mine is from the early 90s). They easily get dirty and can create all kinds of weird symptoms. Just spray some contact cleaner into the top of the switches (or wherever you can get it to penetrate) and press them several times to clean the internal contacts.Hope this helps!

author: Stray Electron
author_rank: Super Contributor
timestamp: October 06, 2023, 01:11:39 pm
content: Thanks for posting that fmashockie. I've added it to my manual collection.
HP Probook 640 G2 blank screen problem - Page 1
Forum section: electronics / repair

author: soma64
author_rank: Newbie
timestamp: June 17, 2021, 07:27:49 pm
content: Hi friends!I've encountered a problem with my HP Probook 640 G2. The screen is blank and it doesn't seem to work. The laptop screen and cable aren't faulty, I've connected them to an another notebook and they work, but if I connect a different, perfectly working screen and cable to this laptop, it doesn't work either. If I connect an external display/monitor there's an image, but the notebook screen itself doesn't. I think the problem might have to do with the LVDS port (40 pins). I cleaned the LVDS connector on motherboard and it seems fine, it didn't solve my problem. The screen, mic and webcam all share this connector, but I don't know the pinout. I compared it to other notebook connector pinouts and it isn't identical to any of them. The 3.3 V can be detected on the connector, so the non-existent lack of it can't be a problem either. There's a 21A40 marked 5 pin IC near the LVDS connector, which I assume provides the 3.3 V, and it indeed does. (I couldn't find this IC in the catalogue, but I believe it has a similar function to SY6288 which is a low loss power distribution switch ) First I assumed this was the problem, but because of this it can't be. I would appreciate a lot if someone could send me the pinout of this LVDS connector, it would help me a lot in finding the problem. Or if someone has the schematic of the notebook or any idea I'd greatly appreciate if they could share it with me.Thanks in advance,Soma
Hp Prodesk G1 Mt motherboard MS 7860 - Page 1
Forum section: electronics / repair

author: picafra
author_rank: Newbie
timestamp: November 16, 2020, 10:47:49 am
content: I have HP Prodesk G1 MT PC desktop. The PC does not power on. The green led on motherboar is on and I noticed that LDO regulator GS7133 overheats, I replaced it, but the pc does not start.Please help meThank You

author: m k
author_rank: Super Contributor
timestamp: November 18, 2020, 12:40:11 pm
content: Try powering it on straight from ATX connector.

author: picafra
author_rank: Newbie
timestamp: November 18, 2020, 11:46:39 pm
content: I have already done this test. The processor fan is spinning, but the pc does not start.Thanks for the suggest.

author: Rasz
author_rank: Super Contributor
timestamp: November 19, 2020, 12:35:49 am
content: Quote from: picafra on November 16, 2020, 10:47:49 amthats the symptom of a short on +VCC1_5, bad news is this voltage is used exclusively by H81 Chipset chipset, the only other elements on that line are ~3 capacitors, 1000uF, 1uF and 0.1uF.
HP Service Notes - where are they? - Page 1
Forum section: electronics / repair

author: HalFoster
author_rank: Frequent Contributor
timestamp: July 09, 2019, 07:35:26 pm
content: While it is very easy to find HP's older Application Notes, Bench Briefs and such online, there are very few service notes floating around (including the ones sometimes available on the Keysight website) the vast majority are, as far as I can tell, not available either digitally of in print. I see so many referenced in Bench Briefs and other places but have never been able to find more than a few. Does anyone know if any more are available somewhere? Keysight has some here, but not many. Maybe just newer ones?https://servicenotes.literature.keysight.com/litapp/SearchSN.do?method=openExternalSNSearchThank you,Hal
HP Spectre X360 does not detect AC adapter - Page 1
Forum section: electronics / repair

author: Miti
author_rank: Super Contributor
timestamp: September 21, 2024, 09:09:46 pm
content: My daughter's HP Spectre X360, model 13-4120CA does not charge anymore. It doesn't even see that the adapter is plugged.Bought in 2017, few months ago the battery died and I replaced it with a new, after market one, everything was back to normal and she left it plugged while we went on vacation for a week. When we came back it completely drained the battery and it didn't charge again.I suspected crappy battery, and I still kinda do, but I've charged it manually and it works fine... from the battery. I would expect however that when I plug the charger, some sign to show up beside the battery, something to happen, but it doesn't.Steps that I took:1. Cut the cell cover and measured each cell, they are balanced.2. Opened the AC adapter, loaded it, It can supply 3.5A no problem.3. I've soldered a new cap on the DC output, just in case its caps are dry, still not detected.4. It has some diagnostics, I ran them, the AC adapter fails, the battery passes.5. Checked the DC cable from the adapter to the main board connector, not only to the input port, ID is also there.I did not take the PCB out but on the top side I cannot see anything burnt.Anybody has experience with these amazing laptops? Didn't have any issue until the battery passed away of old age, amazing power management, my daughter #1 used it all day on battery in university and she passed it to #2 last year. Do you have a schematic? She's desperate ( and I am too that I have to buy another one), any help is appreciated.Cheers,MitiEdit: Correction, it was unplugged during the 1 week vacation but most likely not shut down, she plugged it back when we came and took it to school for one day, it died suddenly in the evening and never recharged again.

author: Miti
author_rank: Super Contributor
timestamp: September 25, 2024, 02:42:35 pm
content: Nobody? :'(
HP spectrum Analyzer 8591E  - Page 1
Forum section: electronics / repair

author: Talli
author_rank: Newbie
timestamp: August 28, 2024, 11:45:12 pm
content: QuoteModifyRemoveI bought this HP spectrum analyzer model 8591e few years ago... Wanted to learn how to use it... When I was putting together fm radios... I'm still learning how to use it...It has a tracking generator and the frequency range of the analizer is 1mhz to 1.8..GhzWhen I try to do the self calibration (frequency and amplitude)... It fails the amplitude test... The messageCal res band width amplitude fail... Srq110Does any one knows where is the issue??.. Worked on a unit like this. What stage... Is bad components are bad.... It's a beautiful machine would love to fix it.eSincere
Hp spectrum analyzer model 8591e  - Page 1
Forum section: electronics / repair

author: Talli
author_rank: Newbie
timestamp: October 30, 2022, 03:54:30 pm
content: I bought this HP spectrum analyzer model 8591e few years ago... Wanted to learn how to use it... When I was putting together fm radios... I'm still learning how to use it...It has a tracking generator and the frequency range of the analizer is 1mhz to 1.8..GhzWhen I try to do the self calibration (frequency and amplitude)... It fails the amplitude test... The messageCal res band width amplitude fail... Srq110Does any one knows where is the issue??.. Worked on a unit like this. What stage... Is bad components are bad.... It's a beautiful machine would love to fix it.Or if one can help with service manual for this model pleaseSincerely

author: Miti
author_rank: Super Contributor
timestamp: October 30, 2022, 05:38:18 pm
content: I assume you connected the calibrator output to the input with a short and good quality 50Ohm cable.

author: Talli
author_rank: Newbie
timestamp: October 30, 2022, 06:03:07 pm
content: Hi there... Yes I did... I have anther one but 8591A...And it does the calibration fine... And I store it... Etc... Using the same cable... And have few of those cables... Something with the dbm volts measurements is off... On the e model...... But thank you for making an effort..Thank you

author: xwarp
author_rank: Frequent Contributor
timestamp: October 30, 2022, 08:13:50 pm
content: Here you go:https://www.eevblog.com/forum/testgear/hp-8594e-cal-res-bw-ampl-fail/https://community.keysight.com/s/question/0D52L00005IdqavSAB/little-problems-with-an-hp8591eDiscusses same issue.I have that model spec/an and use it for FM radio work. Mine also is the 75ohm impedance. Is yours also?

author: Talli
author_rank: Newbie
timestamp: October 30, 2022, 11:11:44 pm
content: Hello there... Yes and yes indeed..Has 75 ohm input and 75 ohm tracking generator...I'm going to head where you told me to io... I find it difficult to believe... That I will get the answer... But you never know... I'll come back and update... Thank you for the effort.I read that post before by doing search... No solution... They returned the unit to seller...Second link.. No solution either just speculations...
HP transistor array 1821-0001 in 3456A - Page 1
Forum section: electronics / repair

author: rolkinas
author_rank: Contributor
timestamp: September 28, 2019, 12:12:31 am
content: I want to share my experience replacing HP transistor array 1821-0001 in 3456A on A30 board.some time ago this part failed in my 3456A. Replaced it with 5pcs of 2N3904 and it worked for some time. This suggestion was found somewhere in someone's blog. After some time unit started to be unreliable. Had to turn on oscilloscope which means it is serious repairusing 2N3904, timing on TP1 and TP2 on A30 board is way off. Same with new set of 2N3904. Looks like it was working just with help of devil.Quick experiment showed that SS9018 transistors is almost perfect fit. SS9011 fits good also.Pictures shows signal timing of original 1821-0001 (from working unit), 2N3904, 1821-0001, SS9011 and SS9018sorry for different horizontal time base. Was on hurry.Hope it saves someones day

author: amspire
author_rank: Super Contributor
timestamp: September 28, 2019, 01:10:07 am
content: I gather the 1821-0001 is a CA3046. Why aren't you replacing the array with a CA3046?I have plenty of the smd version of the CA3046 (LM3046M). If you have trouble sourcing the chip, send me message. I could post a few.Richard

author: rolkinas
author_rank: Contributor
timestamp: September 28, 2019, 01:10:51 pm
content: Thank you for advice! Cross reference of HP part numbers that I have, has no 1821-0001 mentioned, I thought that it is proprietary part. Now found new HP cross reference book.Mouser has HFA3046BZ which looks to be current versionAnyway I have plenty of discrete transistors in storage it was fix on hurry. Currently SS9018 works just fine I will not replace them until next failure

author: Kleinstein
author_rank: Super Contributor
timestamp: September 28, 2019, 02:48:00 pm
content: The circuit around the transistor array does not look like it needs matched transistors in the classical sense. So a replacement with single transistors is probably OK in this position.
HP x360 salvage - Page 1
Forum section: electronics / repair

author: LeonardoK
author_rank: Newbie
timestamp: November 20, 2023, 03:53:28 am
content: New to these forums, hello hello. I have an old HP x360 with an AMD Ryzen 5 2700u. This was an old laptop that was damaged at some point, but now I have a use for it. I have all the parts except for the screen & keyboard. The goal is to identify whether the laptop mainboard is usable.1-This old laptop was wiped, it has no OS and nothing worth saving on it.2-I know the screen was an EDP 30pin3-the battery still seems to hold a charge, but an 8 pin blade system makes it hard to verify.Onto the fun stuff. Booting it did nothing when plugged to a blue tip charger and HDMI'd into another monitor. I don't know if the drivers would automatically export the graphics out or if it needs an OS to do so, normally the video signal would be through the EDP30. Adding the battery didn't change the boot cycle. I haven't tried plugging in anything beyond the power adapter and the "power-on" switch, both of which are external to the board and connected via FFC ribbons. The lights on the charger and on the power switch are hopeful indicators, but I still need it to load onto a screen, so I can interface with it, and hopefully load a version of Linux. Things I haven't plugged in include the speakers, SD card reader, and cooling fan (which may act like a safety and prevent the booting).Q1: Should the board send a signal via HDMI without the need for an OS?Q2: If it does need a video signal from the EDP30 how can I get that into an HDMI port?

author: coromonadalix
author_rank: Super Contributor
timestamp: November 20, 2023, 12:28:19 pm
content: normally you should be able to access the bios unless pw protected, it should give an video on the screen unless something is brokenno need for OS to intervenedamaged how, physically ? water ? dropped ? lcd hinges broken ?
HP Z600 Power Supply - DPS-725AP - Page 1
Forum section: electronics / repair

author: d3javu
author_rank: Regular Contributor
timestamp: February 06, 2021, 06:58:02 am
content: Hi All,I'm trying to see if there is any possibilities to repair this PSU which is completely dead at the moment.-The green power indicator at the back of the PSU does not turn on at all.-300K+ ohm between live and neutral, No short circuit to ground.-No visible bloated or leaked capacitors, no damaged FET or other burnt marks on the board-No fuse internally-Aware of lethal energy on the cap and i'm definitely being careful in handling/touching.I couldn't find any schematic to start with, so need help from SMPS experts insight on this PSU model.

author: Lorenzo_1
author_rank: Regular Contributor
timestamp: February 08, 2021, 09:20:05 am
content: If you look on Elektrotanya you'll find a schematic for a DPS-470AB. There looks to be a considerable amount in common between this and the DPS-850 used in the HPZ800. You might find a useful guide to some at least of the circuitry in your DPS725.

author: CMTan
author_rank: Contributor
timestamp: July 01, 2022, 09:15:14 am
content: I have repaired this power supply recently, but there is no schematics. Since your power supply has no LED, it is likely that the standby +5V is dead. Refer to this link which could be the cause.https://www.badcaps.net/forum/showthread.php?t=94565My power supply was dead twice and the same fault with the TNY279PN
HP Z800 RTC stops when powered off [SOLVED] - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: August 26, 2019, 11:29:09 am
content: Start with the system running, and the clock set correctly. Shutdown/Power off. Come back later Power on and boot up. Clock shows same time as when I shut down!!!Yes, I have replaced the CR2032 backup battery (the old one measured at 1.66V).Has anyone seen this before?I can't see any BIOS setting that would obviously cause this problem.Suggestions most welcome!!! I'm about to remove the CR2032 and let it sit for a while.ThanksDavid

author: perdrix
author_rank: Frequent Contributor
timestamp: August 26, 2019, 02:00:03 pm
content: Ah well, all's well that ends well! Unplug, remove CMOS battery, press clear CMOS switch, replace battery, plug in again and set up BIOS from defaults seems to have fixed the problem!D.
HP Z800 SMPS fault found - spec suggestions for SMD resistor? - Page 1
Forum section: electronics / repair

author: Lorenzo_1
author_rank: Regular Contributor
timestamp: March 18, 2020, 03:45:08 pm
content: Finally tracked down cause of SMPS failure - a dislodged 10R0 SMD resistor on the primary side of the 12V supplies. Bridged with a through-hole and supply fires up fine. I need to buy in a suitable 2010 component but unsure of spec needed. If I'm reading this right the resistor connects to Pin4 of the current transformer (CT1) and to bases of C2328A transistor (marked Q7 on PCB)/B927 (marked Q8). Not hard to find a part online, but not sure how to calculate what voltage and power spec is needed - also wonder if it should meet any additional specs. Grateful if someone can give me a steer on this. This is an 850W supply with multiple 12V and 5V outputs.
HP1631D fault - Page 1
Forum section: electronics / repair

author: GioCosco
author_rank: Newbie
timestamp: August 18, 2021, 10:22:57 am
content: Hi, I have bought for few euro an HP1631D logic state analyzer, declared dead by the vendor. The unit turns on but with selftest jumper enabled the only display is a fixed pattern with some characters in top left corner. Disabling the selftest there is only the fixed pattern, so this suggest me that something is running. The keyboard doesn't work. I have removed all boards except CPU, checked for electrolytic capacitor leakage but everything seems ok. Also voltages are ok and no battery inside, so no missing nvram problems.I have found the service manual with all schematics and I am already studying it but some suggestions are highly appreciated, expecially if somebody have already found a similar problem. Thanks

author: Martian Tech
author_rank: Regular Contributor
timestamp: August 19, 2021, 02:54:21 am
content: My first guess would be bit rot in the ROM(s) that hold the CPU code. Looks like it gets through initializing the CRT controller because the characters it displays are well-formed.
HP1660ES logic analyzer ROM files - Page 1
Forum section: electronics / repair

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: July 14, 2023, 04:13:22 pm
content: I have an HP 1660ES logic analyzer.I made a big blunder and erased the ROM so the unit won't boot to the application.On startup it's asking for three files to re-flash (ROM, SYSTEM and SYS_032). It will find ROM in /SYSTEM/ROM on the hard disk but not the others.Does anyone have the files / original floppies for this unit? (I can't find any firmware on Keysight's web page)

author: liaifat85
author_rank: Regular Contributor
timestamp: July 15, 2023, 08:34:39 am
content: I think it's better to contact keysight customer support.

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: July 15, 2023, 03:35:42 pm
content: Quote from: liaifat85 on July 15, 2023, 08:34:39 amI tried that... "it's EOL... we can't help"

author: djsb
author_rank: Super Contributor
timestamp: July 15, 2023, 03:55:25 pm
content: Maybe join this group.io and ask there?https://groups.io/g/HP-Agilent-Keysight-equipmentGood luck.PS Bassman59 states in this post that he has/had a HP1660EShttps://www.eevblog.com/forum/testgear/keysight-new-instruments/150/

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: July 15, 2023, 11:45:10 pm
content: Quote from: djsb on July 15, 2023, 03:55:25 pmYes, I did ask over on the Keysight forum and have DMed "Bassman59". Crickets so far ... but I live in hope 8-)I **think** the files I need are on the hard disk (that I've imaged). Its in an odd vxworks format that I can't mount. There's a Linux driver on Github (https://github.com/jens-maus/vxext_fs) built for Linux 2.6 kernel. If I get no other information I might spin up an older Linux release and try that driver.

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: July 19, 2023, 02:15:43 am
content: I've managed to recover the unit!It seems that the ribbon cable that connects the Ethernet hardware on the back panel to the I/O board was disconnected.As a consequence, the software thought that there was no Ethernet and tried to flash 'system' instead of 'system.lan'.Once I reseated the connector, the flash procedure looked for and found 'system.lan' (rather than 'system') on the hard disk and the flash succeeded.(The HP1660E series all came with Ethernet. I think this flash software was derived from that used on the HP1660C that did have an option (015) for Ethernet/LAN.)
HP1670E Logic Analyzer Dead after Firmware Update - Page 1
Forum section: electronics / repair

author: krucker
author_rank: Newbie
timestamp: August 16, 2024, 05:02:52 pm
content: HelloRecently I've bought a nice HP1670E Logic Analyzer at ebay and I've found a newer Firmware (V3.02) for this equipment. From Firmware Revision V2.3 I've done an upgrade to V3.02 using the Diskettes. The upgrade flash procedure was successful. After power up again the analyzer remains in the configuration menu. No analysis are possible. Unfortunately I haven't diskettes for the previous Version for moving back.May someone give Me a hint for solving the problem or a link for firmware Version 2.3?Many thanksGerhard Krucker

author: aeg
author_rank: Regular Contributor
timestamp: August 18, 2024, 02:38:29 am
content: Could you post a picture of the configuration menu you're stuck in?

author: krucker
author_rank: Newbie
timestamp: August 18, 2024, 07:44:25 am
content: Hello aegMany thanks for your assistance. I think I've done a bullshit. The Firmware I've updated isn't for this device (is for HP1670G) and not for a HP16070E. I thought the software with branding on the diskette with 1670/71/72/73G is compatible with my device. I think I need a matching firmware disk or floppy disk image for exactly this device. Maybe someone can help me and send a link or image file to Me.Gerhard

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 18, 2024, 10:17:51 am
content: A02.02 software for the 1670E is available from keysight.https://www.keysight.com/jp/ja/lib/software-detail/instrument-firmware-software/1670e-operating-system-software-version-a0202-sw572.htmlhttps://www.keysight.com/jp/ja/lib/software-detail/computer-software/1670e-family-operating-system-files-version-a0202-696359.htmlThe keysight URL changes frequently, so I am attaching the download for future reference. It is the same one.The .exe's cannot be attached due to file size limitations.

author: krucker
author_rank: Newbie
timestamp: August 18, 2024, 12:52:21 pm
content: Hello and thanks dear Friend!The equipment works now again.Greetings from SwitzerlandGerhard
HP1700 series oscilloscope crimp connections - Page 1
Forum section: electronics / repair

author: stigwurx
author_rank: Contributor
timestamp: August 19, 2021, 12:40:25 am
content: Hi all, working on a couple of HP1707B scopes . Some of the single wire to board crimp connections have become loose , I'm troubleshooting so I've been disconnecting and reconnecting a lot . I guess connectors of this size have a very low repetitive connection cycle lifetime anyway. Squishing with a pliers only works once, the metal seems brittle with age ?Anyway , if you have worked with theses scopes and have replaced these crimps , where did you acquire them ? The pins are .045" square or 1.13mm , wouldn't bet the house on my calipers but it's a reasonable ballpark estimation of size.The pins I refer to are on the rear of the low voltage distribution board ( behind the fuse bank).Thought it'd be a simple thing to find but so much for thought . Would appreciate any suggestions on where to source them.All the best for now.

author: scopeman
author_rank: Frequent Contributor
timestamp: December 03, 2021, 04:43:13 am
content: I think those were Molex parts. I would start there.SamW3OHM

author: tooki
author_rank: Super Contributor
timestamp: December 03, 2021, 08:44:24 am
content: A (clear) picture would be worth a thousand words…
HP182T scope horizontal amplifier problem  - Page 1
Forum section: electronics / repair

author: rodd
author_rank: Regular Contributor
timestamp: October 22, 2023, 02:21:58 pm
content: Dear all,I am trying to restore this instrument so I could use with an HP8559A that I could buy for a reasonable price.However, when I tried to use the 8559A , all I could get was a vertical line, so I discovered that the horizontal amp is not working....I read the troubleshooting charts but they pointed to very serious damages (CRT) so I decided to igore them and use the "basic troubleshooting method" : inject a signal on the external horizontal input and follow the signal.So I injected a 1MHz signal 1Vpp at this input and I could see a signal up to the left side of R15 on the scematics.From that point on, the signal drops to almost zero..The voltages are close to the ones shown on the schematics and I have checked all the resistors close to this point (in circuit) and they seem to be ok.I have no idea of what to do next.Any suggestion?I have attached a copy of the schematics below.Thanks to all

author: m k
author_rank: Super Contributor
timestamp: October 30, 2023, 08:06:58 pm
content: Start checking stated voltages back from deflection plates.

author: BlownUpCapacitor
author_rank: Frequent Contributor
timestamp: November 02, 2023, 06:00:16 pm
content: Check CR2 or Q3. They might be shorted and could be pulling the signal low.Edit: the schematic is sort of low resolution and I can't clearly read the component number designations. I assume R15 is the 15k vernier pot as shown here.
Hp182T with 8559A spectrum Analyzer - Page 1
Forum section: electronics / repair

author: realfran
author_rank: Regular Contributor
timestamp: February 17, 2022, 10:56:32 am
content: Hello, some help please the 182T display unity after 25/30 minutes work and after the luminosity starts fading until trace disappear, pushing find beam work.I need to switch off for some time and switch on start working again, please some help to figure out the faulty.

author: George Edmonds
author_rank: Frequent Contributor
timestamp: February 17, 2022, 12:26:31 pm
content: HiIt is the high value resistors for the CRT supplies that are changing in value due to the applied voltage.A very common problemG Edmonds

author: realfran
author_rank: Regular Contributor
timestamp: February 17, 2022, 09:21:56 pm
content: If I push the "FIND BEAM" I get the beam, if I put the rear OUT D connected to the front" EXT INPUT BNC" pushing " EXT DISPLAY" I get the SA trace.
HP2207 monitor will not power up - Page 1
Forum section: electronics / repair

author: adauphin
author_rank: Unknown
timestamp: January 01, 2025, 05:08:42 pm
content: We have two of these for the wife at her desk, one decided to not power up. The blue light on the power button illuminates, but when you plug it in, this is the sound from the rear panel.Curious if anyone has dealt with these, any insight is greatly appreciated.https://youtu.be/dNmy6NWTHvo?si=BrcrdeY28PfxaAeZ

author: m k
author_rank: Super Contributor
timestamp: January 04, 2025, 09:28:50 pm
content: My guess is that it was night and weather was heated.Light the screen with a flashlight, can you see anything?

author: Swake
author_rank: Frequent Contributor
timestamp: January 05, 2025, 10:09:50 am
content: Sounds like very small sparks from high voltage components.If you don't crack it open you'll never know!

author: adauphin
author_rank: Unknown
timestamp: January 27, 2025, 05:04:16 am
content: I finally had time to tear into it. Looks like the two caps at C818 & C819 have some bulging. Both are 1000uF 10V Su'scon. I should just replace all of them.

author: adauphin
author_rank: Unknown
timestamp: January 27, 2025, 05:38:56 am
content: After removing both caps, C818 is 46uf & 18M ohmsC819 is 107uf & 19M ohms.

author: Swake
author_rank: Frequent Contributor
timestamp: January 27, 2025, 07:32:30 am
content: Indeed these caps are dead. When they're bulged like that there is no doubt, even if they read good enough they will dry out very quickly.Replace these 2. You can replace the other too, but I would not do it unless I have them in stock as surplus from another project.To build a reference just in case you need it later, do take pics from everything at all angles so component types can be read and PCB traces are visible.
HP3212A - Page 1
Forum section: electronics / repair

author: lucatz
author_rank: Contributor
timestamp: November 13, 2020, 01:19:55 am
content: Hi All,Wondering if I should be worried about these. Some seem discoloured.Thanks

author: wn1fju
author_rank: Frequent Contributor
timestamp: November 14, 2020, 01:41:46 am
content: I assume you are referring to the brown capacitors in your picture.Looks like normal color variation among vendors and/or lots. Nothing to worry about. They shouldn't be dissipating any power anyway.I've attached a photo of a few I pulled out of my junk box. It's hard to see in my photo, but I can assure you every one has a slightly different color.

author: lucatz
author_rank: Contributor
timestamp: November 14, 2020, 02:11:22 pm
content: Yes I meant the red Caps. Sorry wrote that somewhat quickly and omitted the actual question. Happy to say that for 30 bucks it functions as it should.
HP3245A repair - Page 1
Forum section: electronics / repair

author: bfsy
author_rank: Newbie
timestamp: October 02, 2022, 05:54:50 am
content: The output is normal when setting below 0.6V .The output can only reach 563mV when setting higher than 0.6V .The waveform is always normal on R600 .U140 , U180 are OK.
HP3325A repair - Page 1
Forum section: electronics / repair

author: hiwi
author_rank: Newbie
timestamp: March 28, 2025, 03:29:25 pm
content: Hi all,i have spent already many hours on my 3325A generator, but I could not fix it totally. There was a short of Q219 in the output amplifier, i replaced it with a 2N5160 and the amp is working now.The problem is, that the selftest fails at 2 & 3. Test 1 passes. But I have good sine, square and triangle output with correct amplitude. The ramp is suspect, the amplitude isok, but the display blanks and the ramp oscillates form left to right witj 1 or 2 Hz and flips to the other side, very curious. I can add a video.With ACD grounded the error is the same ACAL error at square & triangle.I replaced U20/U24, but no success.Testpoints PK alternates when ACAL pressed, so the LM311 is ok i suppose. It compares level output from U21 and the amp to calculate later the cal values for the processor as I understand.Are there any hints for me? What to check next?I have read the other repair threads here but the issue is not the same. I thought of U31/U32 but square & triangle are working in principle.I have no signature analyzer and the functionality is more than complex. :-)I have rev c boards and the attenuator board has newer japanese aromat relays, many people have trouble with the old yellow ones. They are capsuled any I hope mor reliable.Tap test as mentioned in the service manual does not change anything.Ralf

author: hiwi
author_rank: Newbie
timestamp: March 31, 2025, 02:36:00 pm
content: Hi,I added theampliifier and attenuator schematics, may be someone who has repaired a HP3325A can give an advice.

author: hiwi
author_rank: Newbie
timestamp: April 01, 2025, 10:47:40 am
content: Hi,i tested today a bit more and I found an issue with the DC voltage at PIN AMPL, I have -5,2V should be exact -4 Volts. I can find the signal with the oscilloskop at testpoint DAC.It is -5V. On PIN 7 of U24 it is -5V, at the input and output of the amplifier too, so There must be a problem prior.So analog switch and hold/sample amp should be ok, all other voltages are in spec, -10.2 and ~0 Volts.How is this AMP voltage generated? If the integrator were faulty, the other voltages must be wrong too.Can anyone look at the schematics at this section or explain how the voltage is generated?(Testpoint ADC is grounded)Ralf

author: hiwi
author_rank: Newbie
timestamp: April 02, 2025, 07:31:56 am
content: Hi,at least U31 in group J was faulty and replaced. Now it is back to life.Ralf
HP3325A Service notes (not service manual) - Page 1
Forum section: electronics / repair

author: Tazz
author_rank: Contributor
timestamp: May 09, 2020, 09:08:00 pm
content: Hello,Did someone have, has access to the old pool of HP service notes ?I'm looking for the HP3325A services notes, and more precisely the service note 3325A-5A.For archival purpose, it would be great to put a hand on all 3325A service notes.

author: trobbins
author_rank: Frequent Contributor
timestamp: May 11, 2020, 01:29:11 pm
content: Is something not covered by Section 7 0 Manual Backdating, or in the service section specifically ?

author: Tazz
author_rank: Contributor
timestamp: May 11, 2020, 10:26:31 pm
content: Yes, for example safety service note 3325A-11B-S is cited on 7-27 but without details.3325A-5A is cited on 7-18 and is about a modification procedure to improve square ware phase control on SN 1748A02350 and below. It is perhaps how to add CR110 on A14, perhaps not.And there is a lot of other, like the service note about the new A16 board which is a replacement for the A6 board, etc....There is some missing parts in the end of the scan of the 3325B service manual, but no service note scans.In my case, I have the chance to have a 3325A with a very hig serial number (2947Axxxxx) which has all latest revisions of board common to 3325A and 3325B and even not know in the 3325A service manual and a 516 rev B (A16) in place of the 506 (A6). It only misses the HV option board.So I'm not directly concerned.But it is very sad that all this surely not very big but important part of the documentation is lost for now.

author: TERRA Operative
author_rank: Super Contributor
timestamp: October 10, 2020, 05:32:08 pm
content: Late to the party, but if anyone else finds this info, my hand is up for a copy.Is there any Keysight members here that could provide some info?

author: Arnon
author_rank: Newbie
timestamp: March 05, 2021, 04:36:56 am
content: I am restoring an HP 3325A and missing one piece of information I could not find in the Service Manual. In which direction the fan blow? From outside to inside or the opposite? Thank you

author: picburner
author_rank: Frequent Contributor
timestamp: March 05, 2021, 07:44:04 am
content: Logically speaking, if the filter is positioned externally (of the fan) it means that the fan takes air from the outside and sends it inside the instrument.However, to corroborate my hypothesis, in the attached pic you can see the fan with the air-flow direction.

author: Arnon
author_rank: Newbie
timestamp: March 06, 2021, 02:29:45 am
content: Thank you very much. Indeed, the filter was installed outside and your explanation is perfect.BestArnon
HP3325B Fail 139 - Page 1
Forum section: electronics / repair

author: Greg272
author_rank: Newbie
timestamp: November 21, 2024, 01:29:15 pm
content: Hello, I wanted to welcome all users of HP measuring devices. I also have a request for help in repairing the 3325B generator. The battery was drained after a long downtime, but after replacing the battery, an error occurred during initialization FAIL 139. Does anyone have information about the causes of the error.

author: Runco990
author_rank: Frequent Contributor
timestamp: November 21, 2024, 06:19:52 pm
content: You lost all calibration values. Download the service manual and go through all the special function calibrations.

author: Greg272
author_rank: Newbie
timestamp: November 21, 2024, 11:13:34 pm
content: Thank you for the tips, I don't know if everything is OK because Fail 139 is displayed and it does not respond to the keyboard, is it possible to enter some standard values ​​to restore keyboard support?

author: Runco990
author_rank: Frequent Contributor
timestamp: November 23, 2024, 12:01:14 am
content: keyboard should work, double check your work.
HP34401A - error 608 - Page 1
Forum section: electronics / repair

author: Tlmadsen
author_rank: Newbie
timestamp: February 21, 2020, 08:04:04 pm
content: My trusted HP34401A seems to have developed an error I am strugling a little with. It simply don’t measure anything more and running the full self-test it comes up with error-608: Serial configuration readback failed. Seems like the “chain” to the U501 is somehow broken, but is is not clear to me how ?. I changed the PSU-caps, but as expected it didn’t solve the problem. Inputs are appreciatedCheersThomas
HP34401A randomly displays incorrect characters on the display, won't self test - Page 1
Forum section: electronics / repair

author: TF567577
author_rank: Newbie
timestamp: December 05, 2022, 03:00:39 pm
content: Hi,I had another HP34401A to repair and it's display was very random and it kept crashing. The picture attached shows it trying to display open. I replaced the display board and it still failed. The fault was eventually tracked to the ram U503. I found some M5M5256BFP-70L ics on eBay that worked.Hope it helpsCheers
HP34401A Randomly tripping out / blanking display when reading over 300vdc - Page 1
Forum section: electronics / repair

author: TF567577
author_rank: Newbie
timestamp: November 19, 2022, 06:58:04 pm
content: Hi,I just thought I would share this. My HP34401A started to trip out and blank the display when it was reading +300vdc. After a while I noticed sparking between K101 and E100. it looks like the spark gap has been rubbing the relay and it finally broke down the insulation.Hope it helps.Cheers

author: electr_peter
author_rank: Unknown
timestamp: November 19, 2022, 09:49:23 pm
content: Hi,Did you hear crackling sound from spark before opening 34401A? Or did you find sparking only after debugging?It is good that you found the issue, as otherwise it is tricky to find sparking problems.

author: TF567577
author_rank: Newbie
timestamp: November 20, 2022, 08:31:29 pm
content: Hi,I did quite a bit of debugging. Then I saw a faint spark when I had the lights down. I could just hear the crackle after I saw it.