hybridfree/eevblog-posts huggingface dataset:
ANENG AN8008 noisy and offset readings - Page 1
Forum section: electronics / repair

author: LilJohn2
author_rank: Newbie
timestamp: June 28, 2024, 06:45:34 am
content: Hello, I have an ANENG AN8008 that started to misbehave. The voltage measurement is all over the place when the leads aren't connected to anything, but when I join them, the readings jump between 0 and 300mV every second.When I'm measuring eg. 12V battery I get some reading offset. 12V on battery shows as 13V something, and when I flip the leads I get -10V something.I tried resoldering SMD components but it didn't help. Capacitors looks alright, no discoloration, no cracks. It wasn't abused or modded in any way. Should I change all the caps on the board?

author: Kleinstein
author_rank: Super Contributor
timestamp: June 28, 2024, 11:25:51 am
content: It is unlikely that the capacitors are bad - the AN8008 is not that long available for the caps to go bad. With low power the capacitors don't even get warm from the power losses.A first point to check is the battery. Otherwise a repair is likely not worth it, if a careful visual inspection does not show a problem. A bad solder join is the main candidate for a failure.

author: jzx
author_rank: Regular Contributor
timestamp: June 28, 2024, 01:44:27 pm
content: Clean also the conmutator contacts, sometimes the grease gets into the contacts.
ANENG ST206 - Page 1
Forum section: electronics / repair

author: Sascha_St1975
author_rank: Newbie
timestamp: September 10, 2021, 09:21:55 am
content: Hello,i have a this DC/AC Clamp. All measurements are ok, but in Current DC Mode, i have a offset of 0,33A. Have anyone a Tip to solve it?RegardsSascha
Anesty ZD-915 Temperature is half of set value - Page 1
Forum section: electronics / repair

author: leeR
author_rank: Newbie
timestamp: March 14, 2021, 09:37:19 pm
content: Hi Folks,Last Christmas I got a ZD-915. I was using it just fine for 2 months. Then the other day I wanted to desolder some parts and it was not melting the solder. I raised the temp on the panel and still nothing. If the temp was set for 350 deg C, I would get about 120 deg C.I thought maybe the heating element was going bad and purchased a new one.Installed it and it was doing exactly the same thing. I also checked the wires and solder joints in the gun and the plug and that was fine. Inside the unit appears to be good also but I haven't fully tested it. Wondering if the op-amp chip is bad (LM358).Any ideas on how to set the temp at the tip to match what is being requested on the panel?ThanksLee

author: t1d
author_rank: Super Contributor
timestamp: March 15, 2021, 11:54:31 pm
content: Quote from: leeR on March 14, 2021, 09:37:19 pmYou have an issue that is bigger than correcting the calibration setting to get the tip heat to match the setting. With the unit only three months old, you should surely contact the seller. Most likely, it should be returned for a refund. I would think that there would be two of some component that is sharing the load... Maybe a MOSFET... And, that one has failed. The one that remains is probably being pushed hard to make up the difference and, accordingly, is at risk, too. If you end up having to repair it yourself, buy an extra of whatever the bad component is, to be prepared for the second to fail, as said. There is surely to be lots of repair information on YouTube, because the ZD-915 is so popular.
Anker PowerCore 5000 - Resoldering the USB socket - Page 1
Forum section: electronics / repair

author: horo
author_rank: Regular Contributor
timestamp: June 01, 2022, 08:17:40 am
content: My favourite USB power bank Anker PowerCore 5000 (the small sturdy cylinder) had a loose contact at the USB output after a few years of continuous use.To open the device, you have to remove the cover of the USB ports, which is only fixed with double-sided adhesive. Remove the three screws, then the inside can be pushed out downwards. As suspected, the solder connection of the 5V contact of the socket had come loose; the others didn't look very trustworthy either. After I re-soldered all four pins (with leaded solder), it has been working without any problems ever since.
another 2445B repair - Page 1
Forum section: electronics / repair

author: Dioda
author_rank: Newbie
timestamp: November 01, 2020, 02:21:54 pm
content: So I have this 2245B for a few years and it started failing power on tests(05 fail 44), so I've recapped power supply and regulator boards as there have been some caps with bad ESR. But it did not solve the issue.Next thing was replacing the smd elyt. capacitors on A5 board because they were leaking electrolyte but not caused damage on pcb traces yet. That solved failing self test but traces have become very noisy.Look at these images at various timebases:I tried to turn on BW limit, that somehow cleaned up the traces but soon CRT went dark and now it doesn't show anything at all.So now what? Replace caps on A1 board? The 47u/25V ones have around 0.9-1R ESR. Or did something died?Oh, and now after power on it's stuck on ADD - so test 05 error xxAll voltages seem ok, but can't measure ripple without another scope

author: Dioda
author_rank: Newbie
timestamp: November 06, 2020, 12:22:34 pm
content: So after some measuring I found out that leaking electrolyte did cause damage on resistors around dac312. Maybe some other components as well.

author: Dioda
author_rank: Newbie
timestamp: November 08, 2020, 06:48:38 pm
content: HAH! Resistors replaced with THT just for test and it works now! Also I had to desolder some parts in that area and properly cleanup the board.Trace nice and clean, but readout is now sligthly out of focus.I have ordered some precision resistors for a replacement and we will see.
Another 34401a reported error 604 - Page 1
Forum section: electronics / repair

author: lern01
author_rank: Regular Contributor
timestamp: July 22, 2025, 02:52:55 pm
content: Hi, everyone. I am repairing an Agilent 34401a. There is no relay clicking sound when it is turned on. It reports error 604. There is no change in the panel display when switching functions. But when switching to the frequency range, there are digital jumps. When switching to the diode range, the buzzer sounds. U420 and U106 have been swapped, and U404 has also been replaced, but the fault has not changed. The oscilloscope checks ADSW1 and XADSW1, and the waveform is very good. Input 10V voltage in the DC voltage range, which can be detected in U101-5, but when detecting U101-14, the voltage pulsates very quickly. Checking ADIN of U106-6, about 10V can be obtained, but it is unstable. After passing through U102-15, it comes out from pin 21, which is only more than -0.1 volt, and it is unstable. Checking the resistance from U102-15 to pin 21 on the board, it is more than 30K, and R440 is also normal. U402-6 has a stable -13V. . . . . I am lost in confusion and now I would like to ask for help from my friends. Please give me some advice. Thank you very much!

author: lern01
author_rank: Regular Contributor
timestamp: July 22, 2025, 02:57:17 pm
content: 继续图片。

author: lern01
author_rank: Regular Contributor
timestamp: July 22, 2025, 02:58:37 pm
content: 继续上。。。

author: coromonadalix
author_rank: Super Contributor
timestamp: July 22, 2025, 03:36:34 pm
content: English forum for all related and following messages pleasehttps://www.eevblog.com/forum/repair/hp-34401a-error-604/

author: lern01
author_rank: Regular Contributor
timestamp: July 24, 2025, 11:45:09 am
content: Thank you for your reply. I have read this post. It is different from my fault phenomenon. I have also checked the relevant places. I am currently struggling to move forward. There is a little hope. . . .
Another dead Hantek DSO5102P - Page 1
Forum section: electronics / repair

author: gdunlapsd
author_rank: Newbie
timestamp: September 24, 2025, 05:19:39 pm
content: Hi; my name is Greg and I just joined the forum.I'm a Software Engineer and a tinkerer who has decided to finally dig in and learn how to properly use an oscilloscope!About 6 years ago I bought a Hantek DSO5102P and was able to use it enough to fix a few things (including reviving a dead Commodore 64 that, it turns out, had a faulty clock circuit). Just a week ago I decided to start properly learning the Hantek, but when I turned it on it wouldn't boot up.The backlight turns on, the buttons light up, the fan blows, but nothing ever appears on the screen. The buttons are completely unresponsive, and I've tried turning the power off and on quickly as I've read elsewhere to get into recovery mode, which doesn't do anything either. I plugged it into my PC's USB, and it wasn't detected. The power supply voltages are all good.I emailed Hantek support a few days ago, and they did reply asking for my serial number, which I gave, but nothing back yet. Given that I bought it so long ago, I didn't really expect anything.I don't really have any hope for this thing at this point, but figured I'd ask here for any suggestions, before I chuck it "in the bin" (MCM reference haha). Otherwise, anything useful I can do with it for parts?BTW I just ordered a Sigilent SDS804X HD, so really looking forward to digging into that!Thanks!Greg

author: Grandchuck
author_rank: Super Contributor
timestamp: September 24, 2025, 07:17:27 pm
content: Hi GregYou will love that Siglent scope!https://www.eevblog.com/forum/testgear/sds800x-hd-actual-use-cases/

author: gdunlapsd
author_rank: Newbie
timestamp: September 24, 2025, 11:17:31 pm
content: Thanks Grandchuck - really looking forward to it!
Another KSGER T12 problem - Page 1
Forum section: electronics / repair

author: clchan
author_rank: Newbie
timestamp: July 14, 2021, 11:46:21 am
content: HiI brought a KSGER T12 soldering station few weeks ago, somehow I bent connector when I insert the tip. After I replaced the connector, I found the mosfet Q1 was burned, thanks for one of discussion found here. So I replaced it with IRF9321PBF, and everything looked ok, the tip getting hot but not growing red, and it went to standby as it supposed to be. The only problem I have now, is the red LED, D4, on the controller flashing rapidly, anyone know what might be the cause?Controller board version 3.1
Another Lambda LQD-421 repair - Page 1
Forum section: electronics / repair

author: GumGum
author_rank: Newbie
timestamp: October 23, 2020, 11:25:51 am
content: Hi,I have a half-broken LQD-421, the power supply part works fine however I can't get the front multimeter to work properly. It has a zero-offset of ~1.2V and behaves non-linear through its range. The 100mV reference is fine and I can get it to display the current voltage just fine, however it drifts as soon as I set another one.The problem is present on both sides. I've already replaced IC201 (FBT-00-074) with a ICL7107CPL and Q201 (FBN-L199) with a 2N2907, the problem got better but still exists. All other parts seem to be fine as far as I can tell.The only thing I found that the Voltage near R221 is -5V instead of -5.9V as written in the schematics.Any ideas where the problem might be?Thanks!Luka

author: cnqhdszq
author_rank: Regular Contributor
timestamp: October 24, 2020, 04:11:56 pm
content: check the V–I switchdrop a drop of oil in itmaybe can solve the problem.

author: macboy
author_rank: Super Contributor
timestamp: October 26, 2020, 01:15:47 am
content: I have a 422. Check the power supply voltages to the meter section. Check DC level and AC ripple. Dried up capacitors are a big problem with these in my experience. Do you have the service manual? I can post or email if not.

author: GumGum
author_rank: Newbie
timestamp: October 26, 2020, 01:04:37 pm
content: Good point, but I've already tried that. (This was actually a problem on a another Lambda I had)

author: GumGum
author_rank: Newbie
timestamp: October 26, 2020, 01:06:56 pm
content: The voltages seemed fine, however I haven't checked them for ripple, will do that.I have only the one I attached, If you have a more detailed one I'll be happy if you could send it to me.Thanks!

author: GumGum
author_rank: Newbie
timestamp: November 07, 2020, 12:15:12 pm
content: Sooo, I checked for ripple and the 5V between B30 and B27 are fine. Between B27 and B29 there is some ripple present however I checked C109 and it's fine (I also replaced it but nothing changed, with only 40uF and one diode some ripple is to be expected I think)Then I took out the whole Meter PCB and powered it via a Bench Power Supply but the symptoms remain the same. The offset remains even when B28 and B32 are shorted.Any thoughts? Thanks!
Another Mastech HY3005 overvoltage problem [Fixed] - Page 1
Forum section: electronics / repair

author: bborisov567
author_rank: Regular Contributor
timestamp: March 13, 2022, 11:14:53 am
content: Here is the problem - when there is a sudden load the supply puts out 50v for a second and then it goes back to the set voltage. If i hook a pulsing load, for example a pwm generating board the output stays constanly at 50v. I have replace all electrolytic caps. Measured the output transistors with multimeter - they appear to be ok. Check the supply rails for the op-amp. +12v, -6v are good, -12v measures -15. Also i have changed the trimmer pots on the board. Where to look for the problem? Could it be trimmers not adjusted properly or bad output transistors?

author: bborisov567
author_rank: Regular Contributor
timestamp: March 13, 2022, 12:27:26 pm
content: I fixed it! After a bit more digging i found that voltage base emiter on V13 barely changes when the voltage spiking occurs while voltage base emitter on V14 goes to almost zero. Also there is a small SMD cap between base and collector on V13 (pay attentention to that cap). Replaced V13 but being lazy i didnt solder back the cap immediately. Voila! The supply is working flawlessly. Happy i fixed it soldered back the smd cap. Tested it and the problem came up again. Then reallised the whole problem is coming from the cap.Probably when there is some kind of oscilation the cap is letting current from collector to collector to base while charging.I dont know if somebody added it at some point because it is not in the schematic.
Another Metcal MX-500P-11 lights up but not heating.  - Page 1
Forum section: electronics / repair

author: labjr
author_rank: Frequent Contributor
timestamp: December 26, 2023, 08:46:28 pm
content: I saw a very clean Metcal MX-500P-11 Station on Ebay, so I bought it for a back-up. Seller listed as tested all key functions. Came in. Physical condition looks almost brand new but the iron doesn't heat. The orange LED lights. The green LED lights for a spit second then goes out.I took the back cover off and can see the LM2576HVT-ADJ regulator is blasted to pieces and the 2200uf 63V caps seems to be slightly bulging on the top. The MOSFETs and ZTX parts seem to be okay. Anyone know if a bad filter cap would take out the LM2576 regulator? Or maybe has other issues too?Otherwise I may have to contact the seller to send it back. I'm kind of disappointed because the condition is like new.

author: andy2000
author_rank: Frequent Contributor
timestamp: December 27, 2023, 03:44:24 pm
content: "tested all key functions" is a phrase to watch out for. It's the exact wording the R2 certification uses, which means it came from an e-waste company. Under R2, they're only allowed to sell working electronics to the general public. When they use that wording, it usually means they didn't test it at all, but want to cover themselves.I would return it unless it was really cheap.

author: labjr
author_rank: Frequent Contributor
timestamp: December 27, 2023, 05:29:44 pm
content: I paid $80 plus $20 shipping.I measured about 46V DC with about 6 volts of AC ripple at the filter cap. I thought it may be worth fixing. But not sure. I've repaired a couple of these in the past but haven't seen one with a blown regulator IC. Not sure what caused the failure or if it's fairly common occurence with these units .
Another TDS220 died - Page 1
Forum section: electronics / repair

author: tof123
author_rank: Newbie
timestamp: August 23, 2022, 04:57:08 pm
content: Hello guysi am new to the forum and this is my first post.I have got an old, but still good TDS220 from tektronic.Unfortunatelly, the PSU board seems to be not working at the moment.I have noticed some of the transistors driving the transformer of the backlight are baddly fried, and are not any longer readable .The board is not powering up any longer either, but i am suspecting the primary stage to be faulty and plan to replace the power MOS transistor, but this is for later.my question is, would anyone know the references of what looks to be transistors Q1 and Q2 or Q2 and Q3next to C24 capacitorthe board is rev F/G.Thanks for the help.

author: oPossum
author_rank: Super Contributor
timestamp: August 23, 2022, 06:49:26 pm
content: On a Rev D/E boardQ1: 3N90Q2,3: 2SC3205

author: tof123
author_rank: Newbie
timestamp: August 24, 2022, 10:38:06 am
content: great ! thanks a lot.i'll order parts to fix it !
Anritsu 37269 or 37247A Firmware floppy disk - Page 1
Forum section: electronics / repair

author: lukasengineering
author_rank: Newbie
timestamp: May 28, 2021, 12:26:26 pm
content: HiDoes anyone have a floppy disk with a firmware for Anritsu/Wiltron VNA 37247 or 37269 ? Any ideas where to get those from ?RegardsLukas

author: smal_edelweiss
author_rank: Newbie
timestamp: July 04, 2021, 03:32:18 pm
content: Hi LukasCan you send me a message to my email address: s_m_a_l_._x_y_z_at_g_m_a_i_l_._comI can not reach you on PM.RegardsSimonQuote from: lukasengineering on May 28, 2021, 12:26:26 pm

author: AnJu
author_rank: Contributor
timestamp: October 11, 2021, 02:38:05 am
content: Quote from: lukasengineering on May 28, 2021, 12:26:26 pmHi Lukas,Did you receive this firmware FDD? Would you be so kind to share?Also anybody have37XXX Test (2300-178)andPerformance Verification Software (2300-480, 2300-496 or 2300-237)?I haveAnritsu Cal Data Save Recall softwarefor Anritsu RF generators.http://usedpribor.ru/data/temp/1.PNGhttp://usedpribor.ru/data/temp/2.PNGBest regards,Andrew
ANRITSU 37269E boot up problem - Page 1
Forum section: electronics / repair

author: gecesars
author_rank: Newbie
timestamp: August 10, 2022, 08:04:28 pm
content: Hi,Please, see below the problem with our equipment Anritsu 37269ESheeva PLug is single board computer used as file server for 37269E VNA.It´s connect the instrument to ethernet and also the USB hub and store the OS.Our problem was the BBRAM batery foult cousing boot data lost.Attached you see the batery that was changed but there is no way to recovery data.Apreciate your help,Regards,Geraldo César Simão
Anritsu 37325A 40MHz-13.5GHz Vector Network Analyzer - Page 1
Forum section: electronics / repair

author: Mad Professor
author_rank: Regular Contributor
timestamp: May 05, 2023, 02:09:54 pm
content: Good day all.I am looking at the feasibility of trying to repair a Anritsu 37325A 40MHz-13.5GHz Vector Network Analyzer.Currently I have found three faults with the unit.(1) Damaged screen.(2) Failing hard drive.(3) Software or hardware issue setting internal time and date.Issue 1The first issue is that the LCD screen is damaged but is still partly usable, and the VNA does have a VGA monitor port on the back.The LCD Screen is a Sharp LQ9D340 and it seems that they are still available just a little pricy for what they are, so this should be an easy fix.Issue 2The build in hard drive seems to be failing or has somewhat failed.During a normal power on cycle you get the followingQuoteThe hard drive is a old Quantum Go Drive GU08S011, looking online this seems to be an 50pin SCSI, 3600rpm with a whooping capacity of 85MB.Risky move on my part was to remove the front cover of the hard drive, and then I could see that the drive would spin up but no movement from the heads.However once the spindle is up to speed if I touch the arm voicecoil poking out from the magnets furthest away from the spindle the drive would jump into life and the system would start loading data from the drive.of course I don't want to run the drive without it's cover for many reasons.So I have to come up with a way to make a backup or image of the current drive, and then look at options for replacement.Issue 3When I am able to get the system to load from hard drive I get as far as the following.QuoteI have tried removing all the cards from the system, cleaning all the backplate connectors, and reseating the cards, still the same outcome.Looking at the card that I think is the main processor board it does have a M48T08-150PC1 Timekeeper Ram Lithium Battery.Is this likely to be the fault, and is there any way of testing?Any thoughts?Thanks in advance.

author: Mad Professor
author_rank: Regular Contributor
timestamp: August 08, 2023, 05:28:00 pm
content: Just a quick update.The M48T08-150PC1 Timekeeper Ram Lithium Battery was completely blank, and was unable to reprogram it with any data.Can anyone please advise if there is a drop in replacement for the M48T08-150PC1?Thanks in advance.
Anritsu 37347A Software - Page 1
Forum section: electronics / repair

author: switch998
author_rank: Contributor
timestamp: February 28, 2019, 12:06:36 am
content: Anybody have a copy of the 37xxxA software? I just had an HDD failure on mine and the unit can no longer boot. Supposedly the units shipped with an OS recovery floppy but i've been looking all over for a copy of it and no luck. I could probably recover from an HDD image as well

author: switch998
author_rank: Contributor
timestamp: August 04, 2019, 09:08:01 pm
content: Still looking for a way to recover this thing, anyone know where to get the firmware?

author: Etech
author_rank: Newbie
timestamp: September 11, 2019, 04:03:31 am
content: Send me the hardrive. I can load it. It takes four floppy disks data.

author: Belgarath
author_rank: Newbie
timestamp: May 14, 2021, 09:09:23 am
content: Hello,Might you upload a zip of those four floppies and post the link please ?This would be very helpful, thanksFrançois

author: iJoseph2
author_rank: Regular Contributor
timestamp: May 14, 2021, 11:00:09 am
content: Have you seen this? ..Apparently a boot fault is related to a bad RTC with battery.
ANRITSU 37347C VNA Resurrection - Page 1
Forum section: electronics / repair

author: RocketRanger125
author_rank: Newbie
timestamp: December 16, 2024, 08:22:08 pm
content: I have a classic ANRITSU VNA with 2 faults while booting:1) Keyboard Controller Failure:This devices from panel keyboard seems to work up to the point of the error. There is a hard drive restore feature that responds to the front panel, so I feel that is not the keyboard at fault.The VNA has an AT-Style DIN plug for using a classic IBM 101-Key Keyboard. I have one of those keyboard. The keyboard resets as expected when plugging in, but the fault remains.2) Fails to Set Date and TimeThere is a yellow Real Time Clock chip/clock/battery combo/module on the main board. The original was indeed dead. Digikey sells replacements. That replacement did not resolve the date and time fault.The first thing done was to check all the power supply rails for potential and ripple. All is good there.Anyone have one of these sweet devices and have ideas for next-steps?Thank You!

author: eb4fbz
author_rank: Regular Contributor
timestamp: December 24, 2024, 11:48:43 am
content: It probably lost the boot parameters when the NVRAM went flat. This renders the equipment useless unless you are able to recover it (after replacing the battery).There is another post about how to do this.

author: RocketRanger125
author_rank: Newbie
timestamp: December 26, 2024, 08:20:30 pm
content: Yeah. I have seen posts about recovering other models of this instrument. Never this particular model.Seems I need a reference image of the BBRAM/NVRAM from a known good 36347C, and then a programmer to write to this version of BBRAM surface mounted chip. I can likely install the surface mounted chip on a surf board or other to get on the programmer.I will now go seek any details I can find on recovering this unit. Google didn't have much luck.
Anritsu 37369D VNA boot/start-up floppy disks? - Page 1
Forum section: electronics / repair

author: guarneri0
author_rank: Contributor
timestamp: January 07, 2021, 05:07:49 am
content: Hi,Does anyone have a set of bootable floppy disks that would have come with the Anritsu 37369D VNA?A friend of mine just bought a used Anritsu 37369D VNA that is getting stuck while trying to boot (it shows "completing initialization..." message, followed by several beeps, but never shows the Anritsu splash screen, and keeps showing the "completing initialization..." message. We do hear the attenuators click, and the LEDs for Port1 and Port2 also come on, andgo back and forth, but the screen still shows "completinginitialization..." - we have waited more than an hour but still no progressfrom this message.We wonder if the startup software on the internal hard-disk (flash disk) might have gotten corrupted. Thus, we would like to try booting the instrument from startup/diagnosticfloppies, and reformat the internal hard disk and reinstall the system software.We checked Anritsu website but were not able to find the system software.

author: ttbelectronics
author_rank: Contributor
timestamp: March 12, 2021, 08:24:01 pm
content: It is normal this units show this problem after 10 year or so, the time keeper (BBRAM) die and the boot information got lost, will need to replace the BBRAM and reinstall the boot code, also will need to reinstall the cal factor and if you don't have then saved in a disk you will need a specific frequency counter, power meter and power sensor to be able to perform the adjustment and save.Good luck

author: Aiy
author_rank: Regular Contributor
timestamp: March 13, 2021, 05:49:40 pm
content: Hi there,You can check out the Anritsu-Wiltron group over at groups.io. There are several discussions going on regarding keeping the 37XXX series going and/or repair work.https://groups.io/g/anritsu-wiltron/topicsBest regards
Anritsu MA24106A repair - Page 1
Forum section: electronics / repair

author: d-el
author_rank: Regular Contributor
timestamp: March 19, 2025, 10:24:57 pm
content: I bought on eBay. The device turned out to be non-working. It gives a static error of ~ +9dBm. But, the linearity is quite good.The device is a two-channel power meter on diode detectors.I disassembled the device. I did not find any burnt parts, the detectors seem to be working.The low-frequency amplifiers are working, the approximate gain is 167.The reference voltage source is working, 4.096V.The temperature sensor (SC70-5) at 25 degrees Celsius gives about 1.2V, with increasing temperature the voltage decreases.I connected to the 24C64 EEPROM and read it. The data turned out to be binary.As I understand it, the problem is in the calibration table.I present a photo and a structural diagram of the device.I also attached the contents of 24C64.Please express your ideas.

author: metrologist
author_rank: Super Contributor
timestamp: March 19, 2025, 10:58:21 pm
content: You will need CalXpert™ software. This is a special SW product developed by Anritsu US.https://www.anritsu.com/en-US/test-measurement/support/downloads/manuals/dwl008320If you look at the product user documentation I suspect CalXpert uses programming mnemonics to communicate with the sensor. These are not published.

author: d-el
author_rank: Regular Contributor
timestamp: March 19, 2025, 11:28:51 pm
content: I can't find MA24106A CalXpert.If you have this program, please share.

author: metrologist
author_rank: Super Contributor
timestamp: March 20, 2025, 12:45:41 am
content: You will have to buy from Anritsu. I no have it. But I know it.

author: eb4fbz
author_rank: Regular Contributor
timestamp: August 29, 2025, 02:57:05 pm
content: I think your block diagram is not 100% accurate. That power sensor seems to be a two-path sensor to achieve the 65dB dynamic range. The left path must have a larger attenuator to cover the high power range and the right path would do the low power range. Each AD8629 is driving a different pair of ADC channels.Is the +9dB error consistent across the whole power range?

author: d-el
author_rank: Regular Contributor
timestamp: August 29, 2025, 11:55:21 pm
content: Yes, there is an error in the diagram. Before the upper detector there is an attenuator of 27 dB (not 6 dB).I don't remember the details of the measurements, I put the device aside because I couldn't find the calibration program.

author: d-el
author_rank: Regular Contributor
timestamp: September 12, 2025, 10:15:47 pm
content: Let me know if anyone has a program for calibrating MA24106.
Anritsu MG3681A calibration - Page 1
Forum section: electronics / repair

author: romal76
author_rank: Contributor
timestamp: January 21, 2021, 07:07:27 pm
content: Hello to All!Has anyone tried to find a way to calibrate the MG3681A's output level without anritsu software?Maybe someone has this software or the necessary GPIB commands?Roman.

author: Aiy
author_rank: Regular Contributor
timestamp: January 04, 2022, 10:00:01 pm
content: Hello Roman,I am also looking for the Anritsu calibration software(s) for my 69000-series synthesizer. From the service manual for your MG-series unit I see that you need the mysterious 2300-497 Anritsu RF verification and calibration software. I need the 2300-104 software for my unit.Did you find anything?Best regardsAIY

author: romal76
author_rank: Contributor
timestamp: January 05, 2022, 06:02:28 am
content: Nothing.
Anritsu MG442A - Page 1
Forum section: electronics / repair

author: Vicus
author_rank: Regular Contributor
timestamp: June 14, 2020, 10:56:00 pm
content: Hi, I'm looking for the service manual of my tone generator an Anritsu MG442A. Sadly the nominal level led does not lit up anymore and there is no output. Well the output is very low, some tenth of mv. Thanks.

author: Vicus
author_rank: Regular Contributor
timestamp: June 15, 2020, 09:35:17 am
content: Inside the generator I found this:It's an hour meter. In mine the sign pass the 10 mark. Could it be the cause of the failure?
Anritsu ML2438A - blank screen/Leaky caps repair writeup. Part1 - Page 1
Forum section: electronics / repair

author: Tracker
author_rank: Regular Contributor
timestamp: January 04, 2022, 11:43:06 am
content: Hello forum,Just sharing my repair log on the Anritsu ML2438A RF power meter.This is a very capable instrument with several great features, making it a good choice and in some respects better than the compatible HP/Agilent Power meter.When received, this unit appeared to have a deflective screen, the backlight worked but the screen was completely dark.But on closer inspection I could just about see an image when viewed from an angle.It turned out to be the contrast was way off, making the screen look completely dark.Findings:Contrast is driven from Maxim MAX749 located on the PSU board.Anritsu seem to have a modular PSU which plugs into the main board via two sets of pin blocks, the PSU might been be 3rd party supplied.The MAX749 is a digitally adjustable LCD bias device, applying a jet if freezer spray to the area immediately brightened shifted the contrast level.But closer inspection showed that one of the electrolytic caps associated to the IC had leaked black residue on the PCB.Solution:I replaced Nichicon 470uF cap and the display was perfect again.However I also decided to measure ESR on all the other PSU electrolytic caps and found several more were actually bad, some were even leaking at their base bur could not been seen until removed.It was clear that all caps needed to be replaced.This was Part 1, since the meter has a second problem... it displays a constant 10.00db offset even though the 'offset' function is not enabled.I have a separate thread on this problem, it is not so easy to locate. I suspect it's a logic issue or stuck Range switch.https://www.eevblog.com/forum/repair/anritzu-ml2438a-10-00db-offset-problem-really-weird!!!/Hope fully someone will come in with some assistance.Cheers!
Anritsu ML524C measurement receiver schematics - Page 1
Forum section: electronics / repair

author: vk3gm
author_rank: Newbie
timestamp: January 30, 2023, 04:19:57 am
content: Hi Everyone,I am looking for a set of schematics for the measurement receiver. It is small, compact and near impossible to get around it within the unit to find a RX low volume audio distortion and RX level issue.Thank you in advance.RegardsGeraldVK3GM
Anritsu MS2665C  - Page 1
Forum section: electronics / repair

author: maxniz
author_rank: Contributor
timestamp: July 20, 2025, 03:49:06 pm
content: Hi everyone, i own an old Anritsu MS2665C. It was working fine until I inadvertently touched the input to a positive 5 volt wire.Since then, all I see on the screen only noise. After doing some testing, I noticed that on the first mixer I only have the input signal and not the local oscillator signal. Following the circuit, I have a 4GHz at the input of N3 and nothing at its output. The component is overheating, and I assume it's faulty. It's marked "865"... I hope it's just that, but I don't know what to replace it with. Can anyone help me? i attach the photo of N3"

author: iAleks
author_rank: Regular Contributor
timestamp: July 20, 2025, 06:22:59 pm
content: Maybe something like this MGA-86576

author: maxniz
author_rank: Contributor
timestamp: July 20, 2025, 06:45:34 pm
content: MGA-86576 1.5– 8 GHz Low Noise GaAs MMIC Amplifier .... could be..In the meantime I ordered a: ERA-5SM ERA-5 are you agree???

author: iAleks
author_rank: Regular Contributor
timestamp: July 21, 2025, 01:28:37 pm
content: If i do this repair il better replace components with same case, marking and etc

author: maxniz
author_rank: Contributor
timestamp: July 21, 2025, 01:45:09 pm
content: That's right!!! I ordered 5 this morning. Thanks

author: maxniz
author_rank: Contributor
timestamp: August 21, 2025, 12:47:38 pm
content: they are arrived !!! I replaced it and finally see 4 GHz on the mixer, but nothing from the input where I injected 10 MHz. I followed the signal and see two components around the input pin. See photos.But they're not marked. I myself, "sigh," damaged the analyzer when the probe accidentally touched the 5 volts of an oscillator, and now I have to repair it. On the board, I see four components marked with an "E"; they're at 0 ohms between the pins, and two unmarked circular components near the center pin. Does anyone know what they could be?
Anritsu MS2721B boot loop - Page 1
Forum section: electronics / repair

author: ingowien
author_rank: Regular Contributor
timestamp: January 23, 2021, 09:46:16 pm
content: I got myself an Anritsu MS2721B that was supposed to be working with LO1 locking errors.But instead it is stuck in a boot loop. It always reboots at the same time after the application has been loaded.With the old software OS 2.06/App v1.36 it rebooted at approx. 4.6 progress bar cycles (left-right-left) after approx. 50..55s after power-on.I then upgraded to the latest firmware over network with the Master Software Tools over LAN with the emergency repair option.With the ne OS 3.21/App 1.51 it reboots earlier at approx. 2.8 progress bar cycles.Are there experts with knowledge of the MS2721B or similar devices? Do you know if such a boot loop (application is loaded, then it crashes) points to issues of the DSP board or the RF board? Any suggestions how to proceed? Or should I try to return the device though I wouldn't get back the paid VAT and the return shipping?Is a battery required for the device to operate or should it run from 12V DC?best regards, Ingo

author: dj9ss
author_rank: Newbie
timestamp: May 14, 2022, 03:59:40 pm
content: Battery is not required to run this device.However, you'll need a power supply which is capable of more than 2,5A,otherwise you might experience exacty the effect you described.Regards, Jürgen

author: ingowien
author_rank: Regular Contributor
timestamp: June 27, 2022, 09:27:15 am
content: Hi, thanks for the info, forgot to update the thread.The issue was what a cap of the 24V supply rail was shorted and the moment the 24V was turned on, it shorted the main input rail and the device rebooted. Replacing the cap fixed the issue.best regardsIngo
Anritsu MS420(K) IF board repair / schematics - Page 1
Forum section: electronics / repair

author: Rob.S
author_rank: Newbie
timestamp: April 09, 2017, 10:37:56 am
content: Hello,I am a new user of this forum. I live in the Netherlands, and I am fond of using (and repairing) older instruments, audio- and RF equipment, including tube equipment.I have recently purchased an Anritsu MS420K network / spectrum analyzer. It has 2 inputs; the T input works only correct in linear mode.In log mode I get a display, but the baseline is way too high. Since the IF boards for the two inputs are interchangeable, I have fount the eroor on the T input IF board. I have done a visual inspection and measured the electrolytics and diodes, without finding an error.Can anybody provide me with a scan of the IF board schematics?Thanks,Rob.

author: cincin
author_rank: Regular Contributor
timestamp: June 23, 2024, 08:35:52 pm
content: I'm having similar problems with my Anritsu MS420K. Did you ever find the schematics?Cheers!
Anritsu MS420 schematics? - Page 1
Forum section: electronics / repair

author: cincin
author_rank: Regular Contributor
timestamp: June 23, 2024, 08:41:40 pm
content: Just got an old Anritsu MS420K and it looks like both input circuits got blown... I'd like to attempt a repair but I can't find the service manual or schematics.Does anyone have it in their collection? It would be much appreciated.Cheers!
Anritsu MS4624D- 4 channels...lost option 24 - Page 1
Forum section: electronics / repair

author: flj
author_rank: Contributor
timestamp: May 02, 2019, 09:45:09 am
content: HelloI had to change the BBRAM battery. I was able to restore the BBRAM and re calibrate. I lost option 24 which is standard on the D version (and it seems to have been coded in the BBRAM). Is someone can share his BBRAM content as a text or bin file format?Thank you very much, really appreciate.

author: djac
author_rank: Regular Contributor
timestamp: May 03, 2019, 10:14:28 am
content: have you put in the right value for DRam-Size after calling the debuggers cfg:m command?bug> cnfg;mand answer the questions as follows.MPU Clock Speed = “32”Ethernet Address = “00E0A0xxxxxx”, get 6 trailing characters from the logbookDRAM size = “16” (note: for boards with installed option 24 board put “40” here)SRAM size = “2048”DSP Shared Memory = “0128”Flash Size = “02”Extended Flash Size = “08” (note: if this won't work, use value 02)Update to NVRAM = YType in the following command:bug> cnfgand verify the results returned are the same as above.Regards Dieter

author: flj
author_rank: Contributor
timestamp: May 03, 2019, 10:54:34 pm
content: Hello Dieteroh oh...I put 16. That will explain why and you save the situation again.Can I change the value 16 for 40 without affecting the rest of the BBRAM. The BBRAM contain the calibration (ALC, 10 MHz etc...)At the address fffc1f36 and fffc1f37 (see attached), if I want to change character 1 and 6 for 4 and 0----4 and 0 is 34 and 30Memory Writebug>mw fffc1F36 3430;b----here I am not sure if this a byte or a word?Is it the proper syntax?Thank you again,

author: flj
author_rank: Contributor
timestamp: May 04, 2019, 09:03:03 am
content: Hello Dieter,...or if I do cnfg;m again with the debugger and answer the questions again, will it change only these bytes?Regards,

author: djac
author_rank: Regular Contributor
timestamp: May 04, 2019, 09:04:15 pm
content: Yes, with cnfg:m only the changed values are written to BBRAM. If you press only <return> the shown current value is unchanged. So you can step trough the list until you come to DRAM SIZE. Here put in the correct value.Regards Dieter

author: flj
author_rank: Contributor
timestamp: May 06, 2019, 09:51:57 pm
content: Hello Dieter,Thank you, it works very well.I have a question regarding the HDD...I did not see a hard disk inside. Is the hard disk the one we could connect on the SCSI interface?Regards,François

author: djac
author_rank: Regular Contributor
timestamp: May 07, 2019, 03:02:29 pm
content: The HDD is implemented via a battery backuped static ram ( a second lithium battery, not the one for the RTC chip with static ram).Before you can use the HDD it must have been formatted (via menu, probably utility menu).Regards Dieter
Anritsu MS560j schematics? - Page 1
Forum section: electronics / repair

author: Danijel_1993
author_rank: Newbie
timestamp: July 07, 2024, 05:15:06 am
content: Hello. I have old Anritsu MS560j Network/Spectrum analyzer, that is working, but have some issues. Does anyone have user/service manual? Since my online search gave no resaults.I could troubleshoot it without, but it would be nice to have one.Thanks in advance.

author: Stray Electron
author_rank: Super Contributor
timestamp: July 07, 2024, 02:25:14 pm
content: I have a coupe of Anritsu SAs and some other TE but I've never found schematics for any of it. I think I found a block diagram for one SA but that's it. The Anritsu stuff is nice and works great but I generally avoid it due to the lack ofanyservice related documentation.Have you checked BAMA? IF anyone has documentation for any electronics they probably have a copy. <https://bama.edebris.com/>

author: Danijel_1993
author_rank: Newbie
timestamp: July 08, 2024, 04:02:22 pm
content: I checked Bama, but no luck. I was able to find for MS420, which is identical to MS560, just different frequency span. Even in that manual, there are no schematics, just block diagrams. Still no luck.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 08, 2024, 05:11:30 pm
content: have you asked Anritsu under an NDA ... non disclosure agreement ...

author: metrologist
author_rank: Super Contributor
timestamp: July 08, 2024, 06:42:37 pm
content: I believe that equipment was designed and manufactured by Japan HQ, some 40 years ago. HQ has always been reluctant to release technical product info and they likely do not even have easy access to it now.

author: Danijel_1993
author_rank: Newbie
timestamp: July 12, 2024, 04:10:38 pm
content: I will have to ask Anritsu directly, maybe i have luck and they have .pdf of manual. Thank you all for response!
Anritsu MS610 pushbuttons - Page 1
Forum section: electronics / repair

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: June 02, 2020, 05:14:43 pm
content: Hi,I have an Anritsu 610A that the span pushbutton is not working.I have a 610B manual and it appears to be similar enough to troubleshoot by.I'm planning to open it up and momentarily jumper across the 74C923 pins that correspond to the span switch.If that works its probably the switch contacts or a wiring fault.Has anyone figured out how to access the switch contacts so they might be cleaned/repaired???It looks like "maybe" the front panel may come off?Cheers,Corby

author: tonyalbus
author_rank: Super Contributor
timestamp: July 06, 2020, 01:53:39 pm
content: Maybe this helps... have a MS610C which is almost the same..
Anritsu MT8801B Image Restore Issue - Page 1
Forum section: electronics / repair

author: hansgt21
author_rank: Newbie
timestamp: August 31, 2025, 09:08:25 pm
content: All,I recently acquired a MT8801B to be used as a spectrum analyzer.The installed PCMCIA card was defective so I got a PCMCIA adapter with a CF card ( 16Mb ) to replace it.I have tried several available images put on the CF card in hex using HxD.The results so far :it turns on, shows the initial checks : cpu ok, rom ok, sram ok, dram ok.Then it tries to address the floppy drive about 10 times and finally displays " Loading ..." .Sometimes it stops there, sometimes it ends up with a white screen.I am not sure why the analyzer tries to address the floppy drive 10+ times before displaying “Loading … ".This seems to be strange ( some data missing ?? ).Here is what I did to load the image :open HxD in admin modego to “Tools / Options / General “unclick “ Open disk as readonly by default “go to “Open Disk”, open cf card and highlight content ( CTRL a )go to “Edit / Fill selection / fill with 00 / Save” to rease any contentgo to “File / open “load image file and copy to clipboard ( “File / Open… “ followed by CTRL a, CTRL c )switch to cf card in HxD and set cursor to 00000000x0go to “Edit / Paste/Write”go to “File / save” to save the image to the cf cardsavely eject CF card.The only data on the cf card is the image file.Some messages on the board mention a FAT formatted card.If I format the cf card I cannot copy the image file to 00000000x0 as the Windows info occupies the first sector.The analyzer is in very good shape, all supply voltages are available, boards are very clean, caps look good ( a few that I have desoldered and checked are within spec ).Anybody have any ideas what might be wrong ?Best regardsHans
Anritsu S331A display repair - Page 1
Forum section: electronics / repair

author: arno
author_rank: Contributor
timestamp: December 09, 2021, 02:25:39 pm
content: Dear all,I could get my hands on a used Anritsu S331A analyzer with broken (cracked) display for some bucks. "Official replacements" for the Hyundai HD16501NG-EW are avail. in China. I was wondering whether it was possible to replace it with something a bit cheaper (they cost around 100...120 Eur).The main controller is a Toshiba T6963C and I have already figured out the pinning of the 20-pin connector going to the main board:1+2: GND3: +5V4: -5V5:6: nWR7: nRD8: nCE9: C/O10: nHALT11: nRESET12..19 D0..D720: ncThanks in advance!Arno
Anritsu S332D - Page 1
Forum section: electronics / repair

author: EA7HOG
author_rank: Newbie
timestamp: March 30, 2024, 08:59:19 am
content: Good morning, I have an Anritsu S332D that passes all the initial tests, its internal bolometer works well, spectrum analyzer and tracking without problems, but the roe measurement, although the calibrations are carried out without problem, the final response has a lot of noise or a lot of imprecision, that is, if after calibrating I place a load of 100 ohm to see a swr of 2:1, looking at the graph it is impossible to define the value of sww, showing, depending on frequency, an infinite number of peaks with values between 1:1 and 5: 1, I think that some RF switch is not working correctly, that's why I'm looking for a diagram and component distribution, any help?

author: vishaldotgupta
author_rank: Regular Contributor
timestamp: April 17, 2024, 09:21:31 am
content: hi, to the best of my info schematic for this model is not available. i do have some experience in repairing these and can help you but it you mentioned stuff like bolometer , ROE etc which i cannot co relate.To move ahead pls send me high resolution pictures of both sides of your main board. i should be then able to zoom in and see parts etc for faults.i general this unit has a spectrum analyser module as separate and the main board is responsible for site master functions and processing etc
Anritsu S412E, factory calibrations. - Page 1
Forum section: electronics / repair

author: AndyEng
author_rank: Newbie
timestamp: February 12, 2023, 01:12:14 pm
content: I faced with problem on my S412E LMR Master.Disappeared modulation in signal generator. Worked only Continuous Wave mode. AM/FM digital DMR did not work. After some investigation, I found that it was not hardware issue, but software. I totally cleaned flash IC on SigGen board, flash new test patterns from Anristsu site, and now, it is working. But, looks like factory calibrations also was in this flash. At present time, all works, but I see message "Calibration invalid" on screen in all modes, and SigGen level have mismatch around 4 dB.Does anybody have any info about factory calibrations for this device? In "Maintenance manual" I found only info about frequency alignment, without any information about other parameters alignments (SigGen level for example).Any help is welcome.

author: metrologist
author_rank: Super Contributor
timestamp: April 21, 2023, 05:27:26 pm
content: This would need to be sent in to service for re-cal. The factory likely keeps the cal data file, but the service group would not likely mail it out and they would more likely re-cal the unit anyway as there is little value in recalling the old cal unless they were investigating a warranty or systemic issue.