hybridfree/eevblog-posts huggingface dataset:
Adding buzzer on Mastech M830-B DMM - Page 1
Forum section: electronics / repair

author: Stinger
author_rank: Regular Contributor
timestamp: December 16, 2023, 01:56:26 pm
content: Hi,My 90's Mastech M830-B multimeter didn't have beep continuity.Can i add buzzer in Diode mod ?Where solder buzzer on circuit ?Thanks for your help.

author: wraper
author_rank: Unknown
timestamp: December 16, 2023, 02:09:11 pm
content: You'd need to add a circuit like this.

author: wraper
author_rank: Unknown
timestamp: December 16, 2023, 02:13:12 pm
content: To here I think.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 16, 2023, 02:14:07 pm
content: more complicated than neededyou have cheap meters who have the buzzer, if you take time and parts into considerations, it will cost more than a new meteryou need to be sure the dial position will trigger a buzzer circuit, not jst adding the circuit

author: Stinger
author_rank: Regular Contributor
timestamp: December 16, 2023, 08:49:57 pm
content: Thank's for answers. I think easiest like seen on YT

author: wraper
author_rank: Unknown
timestamp: December 16, 2023, 08:58:54 pm
content: You need to have some sort of comparator anyway, won't be simpler than LM358 with a few resistors like in M838 circuit. You can use buzzer with built in driver directly powered from comparator to minimize component count (throw out transistor and a few resistors).
PPG Waveterm & PRK keyboard repair needed (with working Wave 2.3) - Adelaide - Page 1
Forum section: electronics / repair

author: Anamnesia
author_rank: Newbie
timestamp: August 02, 2021, 10:21:30 am
content: Hello, I'm looking for someone (or somewhere) in Adelaide (South Australia) who is interested in repairing minor issues with this mid-1980's Synthesizer Computer System from Palm Products Germany (PPG), comprising of;* PPG Waveterm A (music computer) - fault either with the mainboard or the floppy disc controller for the Shugart 5.25" disk drive* PPG PRK (Processor Keyboard) - communicates with the Waveterm, but doesn't bulk dump ROM data - I think might be a power supply issue.* PPG Wave 2.3 (Synthesiser) - this is actually working A-OK, 100%More information of the PPG Synthesisers can be found here;https://www.ppg.synth.net/I have a LOT of information, mostly from the CD-Rom compiled by the page curator;https://www.ppg.synth.net/cdrom.shtmlThe faults I'm experiencing seem to be down to age; dodgy PCB traces, Power Supply, or Floppy Controller/Disc issues. I'm confident it's nothing mechanical. All this gear is Motorola MC6809 based & bog standard TTL Logic, but I'm no electronics engineer...Happy to pay for your time/services, or if you know someone who would be a perfect fit (located in Adelaide), please pass me their info.- Cheers!
Adjustment of image on Sony PVM 9220  - Page 1
Forum section: electronics / repair

author: decoder_82
author_rank: Regular Contributor
timestamp: September 23, 2023, 01:48:33 pm
content: Hi,I am trying to adjust the image on a Sony PVM 9220.When I apply a grid test pattern, the issue with the image is clearly visible. The vertical lines are like ghosted. See picture attached.That's the first time I observe this. Any suggestions where to look at ?There is also a convergence issue at the bottom of the image that I will need to fix.Many thanks

author: decoder_82
author_rank: Regular Contributor
timestamp: September 25, 2023, 04:06:01 am
content: In case this could be useful, here is the link to the service manualhttps://archive.org/details/sony_PVM-9220ME_Service_Manual
Adjust/Repair of Wattmeter Lutron DW-6090 / Peaktech 2510 / PCE-PA 6000 - Page 1
Forum section: electronics / repair

author: butech
author_rank: Contributor
timestamp: January 14, 2022, 12:19:08 pm
content: Hello to everyone,I acquired one of these "cheap" wattmeters used, but my unit is not working properly. E.g., the meter shows a current and watt value even if nothing is connected to the terminals. The voltage measurement seems to work correctly (although slightly out of spec).The unit has several trim pots (i think approx. 10) for adjustments (behind the front panel). Using the first of these 10, I was able to fix at least the DC current measurement by adjusting the offset of one opamp at the input. The dc measurement is now working.Maybe it would be possible to use the other trim pots to adjust the other measurements as well, but for this, I would at best need a service manual/schematic, as I have actually not the time to figure it out.Maybe anyone has a schematic? Or did the adjustments?I would appreciate any help.
Adret 742A Signal Generator - Page 1
Forum section: electronics / repair

author: e_pigreco
author_rank: Newbie
timestamp: December 06, 2019, 09:24:59 pm
content: Hi guys,I am trying to repair an Adret 742A SG that was going to be skipped, so might be a bad starting for a beginner !Anyway looking at the unit, it seems that main problem are 2 desoldered cables for which I might be able to solder and another problem are the big PSU capacitors that were missing from the unit. Well, there was only one inside but without screws. I guess there was some attempt to repair... or maybe that was the only good...So looking at some online info they look to be all the same as the one which was there...so 6800uf 40V each.Anyone has an idea how they screw to the board ? So for example in pairs of 2 ++ and -- or any combination or anyone has a photo ?Please do not send schematics as first of all I am a novice in electronics, just an appassionate of radios and secondly I have a degenerative problem to my sight due to diabetes so I would struggle with small writings anyway.A photo or anything like this would help showing me the correct position of the caps (+ and minus).I will try as well to add some photos later.Thanks a lot for the patience in reading and anyone who can help.I know that I should not plug the psu directly...no worries, I will try first to check if all psu outputs are fine because I can see there are values on test points... and then check at the rest of the unit.Thanks a lot !

author: George Edmonds
author_rank: Frequent Contributor
timestamp: December 07, 2019, 10:42:09 am
content: HiSTOP, before wasting any time on the 742A you MUST check the condition of the CPU board. Looking from the front of the instrument with it the correct way up it is the first board on the left hand side, this board has a rectangular Saft backup battery on board which invariably leak and damage the board. The repair of this board is very difficult as the corrosion products get under the IC's some of which must be removed to effect a valid clean up of the board and to repair damaged track work. Be very careful of the correct orientation of the plugin ribbon cable. Please note that Adret use an absolutely unobtainable PCB edge connector.The power supply is a bad joke with all of the French Pink electronic capacitors going open circuit. These can be replaced by modern designs as the screw fixing ones are virtually unobtainable. Power supply diodes also go short circuit and the power supply output ribbon cables (IDC?) burn out.Adret was purchased by Marconi Instruments to obtain access to patents and then quickly put out of its misery.If you do want to try to repair it I can provide details of the capacitor orientations, but please check the CPU board first.RegardsGeorge G6HIG
ADS1013D Oscilloscope - Page 1
Forum section: electronics / repair

author: kenparkyn
author_rank: Newbie
timestamp: May 30, 2023, 12:43:22 pm
content: Hi.I bought the above about 18 months ago and all worked fine.Just now powered it up and everything works except there is no displays of signal on either channel.It's registering 1KHz at 3.5V p-p using the probe calibrator but I see nothing.(Yes, I've switched it off and on again.)Aliexpress where I bought it say its out of warranty so no help there.Bin job? or is there a service manual.? Any tricks I'm not aware of?ThanksKen

author: tunk
author_rank: Super Contributor
timestamp: May 30, 2023, 01:52:51 pm
content: I guess this is the same as the Fnirsi 1013d.This has a long thread, and I think the eevblog user "pcprogrammer"did a reverse engineer and alternative firmware:https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/Edit: Here a link to pcprogrammer's firmware page:https://github.com/pecostm32/FNIRSI_1013D_Firmware

author: Grandchuck
author_rank: Super Contributor
timestamp: May 30, 2023, 05:19:50 pm
content: Sounds like the analog front end is working since the calibrator frequency is displayed. I see why tunk mentions firmware. But, why would the firmware have been corrupted? Do you have any ideas about how that could have happened?
Advance PG59 - Page 1
Forum section: electronics / repair

author: Nikola
author_rank: Newbie
timestamp: May 01, 2015, 07:01:15 pm
content: Hello!I have bought an Advance pulse generator PG59 which was made in UK. It was cheap because only one channel worked. Few days ago I took it apart and started looking for an error.Fault was located at third module and I swapped every single transistor from channel B to A with no luck. Channel B is still operational and the other unfortunately not. Wires and voltages were checked, output signal at A is affected by changing offset but without modulation.Therefore a problem is in diodes or in resistors ? Capacitors (6) were checked.I have paid on some site for repair manuals but after a month I got refunded as they were not able to find one.Does anybody have any suggestions ?Thank you !

author: krazh
author_rank: Newbie
timestamp: November 20, 2019, 06:20:36 am
content: Thanks for the post, as this is an interesting unit.I wish I could help, as I too have been looking for any documentation for this unit.Have you had any luck with manuals ?Best wishes.
advantech PCM 9375 mother board repair - Page 1
Forum section: electronics / repair

author: hitecelec
author_rank: Regular Contributor
timestamp: January 10, 2022, 05:06:46 am
content: Hi AllDoesnt boot . memory ok. have replaced and checkedAny help troubleshooting tips. PFARegardsAnand

author: coromonadalix
author_rank: Super Contributor
timestamp: January 10, 2022, 09:38:00 am
content: Is the battery ok obvious question lollIf the battery is removed after a while the board bios should reset ?? J2 is your clear cmos optionIs the supply ok, they need a 5vdc and 12vdc on the connector (12vdc if you use an lcd interface ??)you have a standby connector and the atx power button, are they okay ?Is the bios chip well seated in the socket, sometimes in the past, i removed carefully the chip and put it back and some computers restartedDo you boot it thru the compact flash card or the ata drive connector ? could it be corrupted ? since its your hard drive ?Manual infos a PDF will openhttps://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwit3Jbl8qb1AhVNG80KHc0KBCUQFnoECAQQAQ&url=https%3A%2F%2Fdocs.rs-online.com%2F8754%2F0900766b8094d1b5.pdf&usg=AOvVaw0SMVC-r8TZIPTigGv628dH

author: hitecelec
author_rank: Regular Contributor
timestamp: January 10, 2022, 10:20:00 am
content: HelloBattery is okay.Power supply is ok.It boots through compact flash card. it is belonging to an analytical instrumentI cleaned the whole pcb with IPA. It did boot and again restarted multiple times. Now it is dead. No beep

author: abdulbadii
author_rank: Frequent Contributor
timestamp: January 10, 2022, 11:10:01 am
content: Quote from: hitecelec on January 10, 2022, 10:20:00 amRecall some remarkable thing happened in between e.g spark, discharging ES etc ?

author: Haenk
author_rank: Super Contributor
timestamp: January 10, 2022, 12:13:24 pm
content: Quote from: hitecelec on January 10, 2022, 10:20:00 amUsually IPA contains also - water. Known to be not a great thing in combination with electronics.Did you make sure your board was *really* dry (like putting into an oven at 50oC)? IPA will flow below ICs and parts, so if you did not properly dry it, you might have had shorts in one or more spaces.

author: hitecelec
author_rank: Regular Contributor
timestamp: January 12, 2022, 06:04:55 am
content: ok.Thanks
Advantest Monitor Repair - Page 1
Forum section: electronics / repair

author: barleybill
author_rank: Newbie
timestamp: November 27, 2023, 10:36:02 am
content: I am in the process of repairing an ADVANTEST R4131B with a ME5813A-TR monitor. The display is a jumbled mess of near horizontal line across the vertical centre of the screen, similar to a partial frame collapse in an analogue TV. I am unable to find a circuit diagram/schematic on the internet or even any reference to the model. The manufacturers name Victor Data Systems is easily found in the Internet but the model ME5813A-TR is not. This would suggest that it is a rare beast. I have even tried searching under the PCB reference number KD31723 to no avail. I am loath to trace out the PCB and make a schematic as this would take two or three days. If I try to run it on my bench (It is inaccessible in the Spectrum Analyser) I would have to provide video and sync inputs and power supplies which I do not see as practical for a one of repair. Has anybody got the schematic or a suggestion as to how the beast can easily be tamed?
Advantest Q8221 Optical Power Meter, manual needed, Error 80 - Page 1
Forum section: electronics / repair

author: Ordinaryman1971
author_rank: Frequent Contributor
timestamp: January 12, 2020, 06:34:18 pm
content: Hi, just won the Optical Power meter with error 80. I've tried to look for a manual to even look up what the error means but it looks like there is none available. Maybe somebody out there uses one of those and has manual available or has some experience with those meters.
Advantest R3131 missing trace on IF-LOG Board - Page 1
Forum section: electronics / repair

author: pbloem
author_rank: Newbie
timestamp: May 30, 2019, 08:39:52 am
content: HiI'm trying to revive a Advantest R3131 (no A) from the dead. The previous owner tried to replace a 4072 OpAmp on the IF-LOG board, 4th section of the mixer.But he failed and teared of 2 traces.He gave up and gave the unit to me (what a nice guy!). Without any schematics to go from, I'm reaching out to this community in the hope some one could pleasegive me an indication where these two pins need to go.The designation of the OpAmp is U4 and the traces of pins 6 and 7 are gone.From hi-res pictures i found online, it seems that these pins could have a trace between them...Thanks Pascal

author: pbloem
author_rank: Newbie
timestamp: June 04, 2019, 04:06:05 pm
content: So I already fixed the Total Gain Failure by replacing a R120 (a 390 ohm resistor) with an 680 ohm resistor (as already stated in previous posts on this board).Now there is still the matter of the IF ATT failure, which I suppose is where the two broken pins of U4 come into play...Still hoping there is someone on this forum who could help me find the correct connection for those two pins

author: picburner
author_rank: Frequent Contributor
timestamp: June 04, 2019, 08:12:51 pm
content: The uPC4072 is a double op-amp and the connection between out (7) and -in (6) turns it into a unitary gain buffer.If I see right in the picture the pin +in(5) seems to be connected to gnd then this is probably an unused section of the IC.

author: pbloem
author_rank: Newbie
timestamp: June 05, 2019, 06:08:56 pm
content: Thank you for your reply picburner...Haven't looked at it that way, was to focused on finding (non existing) trace path.So I still have to find the real problem, that is giving the IF ATT Failure, measuring within the unit is dramatic due to the construction.But I'm going to replace the AD606 opamp in the IF signal path and see if things improve.

author: Raymond Himself
author_rank: Newbie
timestamp: October 06, 2020, 02:38:58 pm
content: Hi pbloem,After replacing U1 (AD606) did you have any succes with the repair?
Advantest R3131 or R3131A firmware dump - Page 1
Forum section: electronics / repair

author: minolta
author_rank: Contributor
timestamp: May 21, 2024, 01:16:09 pm
content: Hello,I am looking for firmware for Advantest R3131 - with the board like R3131A. This means motherboard version without CF card, with internal flash 29F800BA memory with FW. Probably I have corrupted FW - halt status is generated by MCU after few cycles. I have tested free-run mode and it works, so MCU is probably OK.Maybe somebody has this downloaded dump? Or can download?I have only found on web the bin file - attached - and this is not the exactly same with my dump (but is similar with my dump - I do not know why - different version, or vecause could be used to be copy to the memory from disk..(?). I do not know if this could be written to flash memory as is - or some part?Thank you!

author: minolta
author_rank: Contributor
timestamp: June 02, 2024, 07:12:35 pm
content: Now I have 2 versions of these dumps downloaded from 2 working units.
Advantest R3162 Floppy Drive replacenment - Page 1
Forum section: electronics / repair

author: sanwal209
author_rank: Regular Contributor
timestamp: October 12, 2016, 08:15:52 am
content: Hi Everybody,I have Advantest R3162 running perfectly fine. I need to replace the floppy drive with floppy drive emulator. I have tried many cheap Chinese floppy drive emulators but nothing works. Then i decided to use emulator by Lotharek and link to that is following:http://lotharek.pl/product.php?pid=115Now problem is when i connect that floppy drivee emulator and press Shift+ Save buttons on advantest it gives IO Error. I have also attached the pinout of lotharek floppy emulator.Please help me out here

author: Rasz
author_rank: Super Contributor
timestamp: October 12, 2016, 08:31:32 am
content: afaik Lotharek (its the owners nickname) fully supports his hardware, did you contact him?

author: stj
author_rank: Super Contributor
timestamp: October 12, 2016, 08:33:40 am
content: you should ask at the designers forum - they have *very* good support.

author: sanwal209
author_rank: Regular Contributor
timestamp: October 12, 2016, 09:05:25 am
content: Thanks i just posted my question over there. Hopefully will get the answer. Thanks again

author: TomWinTejas
author_rank: Regular Contributor
timestamp: May 05, 2025, 04:13:09 am
content: Sorry for resurrecting such an old thread, but I'm thinking of replacing my floppy drive with an emulated drive on my Advantest R3162. Did you ever figure out a solution?
Advantest R3261 R3361 repair and modification - Page 1
Forum section: electronics / repair

author: Tantratron
author_rank: Frequent Contributor
timestamp: March 25, 2022, 04:47:22 pm
content: Hello All,Very lately I've started to perform EMC pre-compliance testing for a german customer so I've acquired on eBay two legacy Advantest (R3261A and R3361K).As for the first one, it turned out the amber CRT display to be seriously burned and its main PSU to have lot of leaking capacitors. By some miracle, it does work and when opening some of its boards, the rest seems OK. For sure I'll need to change its CRT by either a new one or find a LCD kit compatible with the digital video generator. As for the PSU again I'll need soon to seriously repair it or find another board or sell the all unit for parts.As for the second one, it is really in a mint condition so I'll use that one for my actual contract since my budget is very low for the moment.However I'm very interested to hear return of experience from all of you, like does these R3261 or R3361 are still reliable, interesting to keep operational in a lab or to repair then resell, why some of these sold on eBay are still quite expensive in USA or Korea.How about the ease to repair these models, are there boards compatible between A serie versus C serie, same with B serie versus D serie... in other words, what does sub-system usually fails on these models ?How about easy to add a tracking generator into a R3261 so it becomes a R3361 ?Anymore advices, return of experience would be highly appreciated.Thank you, Albert

author: Ghanou
author_rank: Contributor
timestamp: March 09, 2023, 10:21:08 am
content: Quote from: Tantratron on March 25, 2022, 04:47:22 pmi also got a broken R3261 recently from a friend, and i found out it has a low level reading by about 40db @0dbm input level.will try to post updates as i go along in the repair. btw did you repair yours yet?
Advantest R3272 with intermittent noise & drift of measured level at power-up - Page 1
Forum section: electronics / repair

author: luigiser
author_rank: Newbie
timestamp: September 24, 2023, 08:35:31 pm
content: I recently bought an Advantest R3272, a 26.5 GHz spectrum analyzer, and I’m testing it. I found (for now) two problems:PROBLEM 1: NOISE ON TRACEWhen I power-on the instrument the measurement trace is full of noise (see picture). Something like a superimposed noise generated internally (it is not present on the source, I verified with another SA).If the instrument is cold (not switched on from hours) the oscillation disappears after 10-20 minutes, like it is releated to some internal heating.If the instrument is already warm-up (i.e. switched on from 1 hour) the oscillation disappear after 10-20 seconds from power-up (so it is not only a thermal problem).Sometimes, also after a lot of time the noise disappeared, it comes again for some seconds. Other times for 1 minute or more.Does anyone had similar problems and can suggest me what to check?Searching in the forum I found a user that had a similar problem on an Advantest SA of the same line. He solved replacing an electrolytic capacitor in the “RF deck”, but I really do not know what the “RF deck” is and how to identify this instrument section inside.PROBLEM 2: LEVEL DRIFTThe measurement is instable. Looks like is temperature dependant. At a cold power-on may be 10 dB lower than real, and slowly increase to a correct value in about 1 hour. I was non able to check, up to now, if after reaching a correct measurement it continue to rise very slowly (I calibrated the instrument at a certain point, without knowing if the stability was reached).Until the instrument have reached a certain stability, let’s say 30 minutes from power-on, I was not able to perform the self calibration without “no cal signal” errors.A first check on the power supply outputs does not show high ripple, but the switching noise is high. Anyhow until now I do not noted any difference on the power supply outputs with or without the oscillations.A strange thing I noted: one line at the output of the power supply present a 50Hz square waveform, synched with supply line frequency, with amplitude of about 3.8V, but is the same both with or without oscillation.I’ve low knowledge of RF and this type of instrument. If anyone have any suggestion it’s really appreciated.Luigi
Advantest R3477 Digital IF Board repair - Page 1
Forum section: electronics / repair

author: copyright927
author_rank: Newbie
timestamp: February 14, 2020, 05:27:42 am
content: Just like what happened to nctnico here(45#https://www.eevblog.com/forum/testgear/advantest-r3477-9khz-to-13ghz-spectrum-analyzer/25/).About a week ago, my R3477 reported "self-check failure" when it was started up, and checking the diagnostics info showed the Digital IF board failed.After replacing a short circuit 22uf ceramic capacitor on -5v rail, I still got a"fail".Further inspection revealed that two of the five ceramic capacitors next to the clock shielding box were defective, resulting in the output of the 5V->3.3V converter being only 1.xV (however, all parameters were normal when the removed capacitor was tested with LCR).The digital IF board returned to normal after replacement.But, yesterday, I got another "Digital IF board not found" error. This time, it was a 22uf ceramic capacitor in the I-channel shielding box that short-circuited and burned the 5V rail fuse.I realized it seemed like a problem of poor capacitor manufacturing?!(like rifa) The capacitor failure rate is too high.So I decided to replace all this capacitors on the board (using 22uf/50V X7R 1812package to replace).

author: DaJMasta
author_rank: Super Contributor
timestamp: February 14, 2020, 05:52:12 am
content: Odd series of failures, do they all happen for a common 5V rail? Maybe there's some kind of intermittent noise/overload failure that's just screwing with the rail and various caps are dying because of it. Maybe the problem's actually being fixed by the act of inserting and removing the board in the process of testing - maybe next failure just take it out and put it in a few times and see if you can get it to come good?Otherwise I'd consider just running a mod wire out for 5v and ground (and any other rails that have been problematic) and just put them into a scope on roll mode to look for anything bad looking in normal operation. May be worth just repeatedly running the self test to see if the issue can "solve" itself with retries making it a possible other intermittent failure.

author: copyright927
author_rank: Newbie
timestamp: February 17, 2020, 11:32:23 am
content: Of the four MLCCS that failed, only one was actually directly connected to the +5V (the capacitor that burned the +5V fuse), and one of the remaining three was connected to the -5v and two to the base of the transistor for the 5->3.3(wondering why they used four transistors to independently power four 3.3v chips which in the same small shielding box)
Advantest R3751A VNA "Synthe Unlock" - Page 1
Forum section: electronics / repair

author: Marco_Mar
author_rank: Contributor
timestamp: October 03, 2019, 07:55:36 am
content: Hi, my name is Marco from Italy.I've been using Advantest R3751A VNA since two days ago when a sad message popped up from the screen: "Synthe Unlock".Not immediately though: as soon as I power on the unit, it works fine for a few seconds, then the quoted message pops up.The Service Manual of this instrument is nowhere to be found.Any idea?Cheers
Re: Advantest R3767CH - need help with PLL alightment - SOLVED - Page 1
Forum section: electronics / repair

author: hazzer
author_rank: Regular Contributor
timestamp: April 14, 2025, 01:54:59 pm
content: My Advantest R3767CH VNA has an intermittent PLL lock above 2.106Ghz,the service manual has PLL adjustments as R106 and R112(manual has typo and R106 sometimes get referenced as R116).The YTO had drifted as the settings for R106 & R112 were off and adjustment has helped but there is still an intermittent PLL lock at sweeps above 2.106Ghz.ie the top 3 bands have intermittent noise due to an unlocked PLLQuestion - has anyone re-alighted the PLL including adjustments to R141 YTO gain, R312 YTO offset, and R104 YTO linearity ?all are positioned external to the top edge of the PLL assembly next to R106 & R112No mention of R141, R312 or R104 in the service guide which is to block level.There is a service floppy which I believe has never been seen outside of Advantest?Harry

author: hazzer
author_rank: Regular Contributor
timestamp: April 18, 2025, 03:43:08 pm
content: Turned out to be some bad connections on the Synth module (M05) to the motherboard.The board top edge can move in its side rails and over time this looks to have strained the connections to the motherboard.So not the connector solder joints but the actual female pins in the connector look to have expand, (in particular the trigger circuit as in external trigger the PLL would lock). Long term the two female edge connectors on the motherboard may need to be replaced but for now installing foam to stop the movement works, and looking at whats required to get to the motherboard I'm happy to see how it goes.Harry
Advantest R3767CH serial number 82070xxx made in Japan - replacement CCFL info - Page 1
Forum section: electronics / repair

author: hazzer
author_rank: Regular Contributor
timestamp: April 10, 2025, 01:52:47 pm
content: For info only.Advantest R3767CH serial number 82070xxx used a 800x600 8.4" Toshiba LTM08C015KA LCD.The original two CCFLs are 190mm (glass end to glass end) and are 3mm in diameter.In Europe RS components stock the following part. (April 2025)https://ie.rs-online.com/web/p/display-backlighting/534989Its a 188mm x 2.6mm CCFL and is a good replacement which works well in the R3767CH.Harry
Advantest R3860A service manual + schematic + recovery disk is needed  - Page 1
Forum section: electronics / repair

author: Shushpanchik
author_rank: Newbie
timestamp: December 27, 2023, 09:16:08 am
content: Good day for everyone, please if somebody have this schematics and recovery floppy image send meOr wright here if you know where can i get this information by paying...Advantest service and support group as usual give an answer - very old equipment, unsupported, buy new one, blablabla etc...By the way - very hard to find some practical information of any VNA equipment from this company,Advantest close everything and everywhere (compared to HP/Agilent/Keysight)

author: romal76
author_rank: Contributor
timestamp: March 19, 2025, 08:45:46 pm
content: HiI'm looking for service/maintenance manual tooI was place images of CF and HDD from my R3770 into advantest group, may be it may helps someone.https://groups.io/g/advantestinstrument/files/Advantest%20R3770%20R3860%20VNA/Advantest_R3770_CF256Mb.img.ziphttps://groups.io/g/advantestinstrument/files/Advantest%20R3770%20R3860%20VNA/Advantest_R3770_41Gb.img.zipand also service/config menu password is 882323.
Advantest R6243 ROM Version - Page 1
Forum section: electronics / repair

author: vinovino
author_rank: Contributor
timestamp: September 30, 2024, 02:13:34 am
content: Has anyone of you know how to copy the ROM Version of Advantest R6243?My unit has ROM version A02.My plan was to upgrade it to ROM version B00 or later.Thank you very much.

author: vinovino
author_rank: Contributor
timestamp: October 01, 2024, 12:51:15 am
content: Has anyone of you already tried to upgrade the ROM Version of your Advantest R6243 from ROM Version A02 to ROM Version B00 or later?
Advantest R6581 Display Needed - Page 1
Forum section: electronics / repair

author: TheDefpom
author_rank: Frequent Contributor
timestamp: September 23, 2022, 03:25:05 am
content: Hi All,I have been working on a Advantest R6581 8.5 digit (ish) multimeter which seems to be basically working (and yes I have been doing a video about it), but as usual with this type of gear the display is very dim, I am hoping someone out there has a known good display (with very little/no burn in) so that I can get this looking a lot better.If you have one it will be shipping to New Zealand and payment will be done via PayPal.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 23, 2022, 01:37:53 pm
content: do you have a part number / model, since its an 2 line vfd would it be substituable with an lcd instead

author: picburner
author_rank: Frequent Contributor
timestamp: September 24, 2022, 04:16:29 am
content: QuoteNo, a simple two-line character display is not enough, you need a graphic display.In fact, as you can see from the attached picture, there are also symbols at the top of the screen.Then you should do a decoding as I did some time ago for theWavetek 1271.I also have an R6581T with a barely readable display, I confess that for a moment I thought about doing a similar thing but then I gave up.

author: aronake
author_rank: Frequent Contributor
timestamp: May 03, 2023, 11:00:38 am
content: Have anyone had any success in finding a display or some alternative solution?

author: TheDefpom
author_rank: Frequent Contributor
timestamp: May 03, 2023, 11:10:48 am
content: Not yet, I got mine brighter but it still is in desperate need of replacement

author: aronake
author_rank: Frequent Contributor
timestamp: May 04, 2023, 04:48:57 am
content: Quote from: TheDefpom on May 03, 2023, 11:10:48 amThanks. I saw your video while searching for this. Good work both on video production and repair work!Good there is the LCD display hack in case anything else fails.

author: aronake
author_rank: Frequent Contributor
timestamp: May 04, 2023, 04:48:04 pm
content: I'll be in Akihabara next week, so will search around. If any place to find one of these displays, that should be a good place.

author: branadic
author_rank: Super Contributor
timestamp: May 04, 2023, 08:14:48 pm
content: I was one of the lucky guys getting a new VFD back in 2020 for my unit.https://www.eevblog.com/forum/metrology/advantest-r6581-8-5-digit-dmm-mini-teardownrepair/msg3245622/#msg3245622-branadic-

author: aronake
author_rank: Frequent Contributor
timestamp: May 06, 2023, 05:25:06 am
content: Kind of a odd that these ancient displays was manufactured as late as 2017.
Advantest R6581T 8.5 Digit DMM Repair Series - Page 1
Forum section: electronics / repair

author: TheDefpom
author_rank: Frequent Contributor
timestamp: October 14, 2022, 02:52:06 am
content: Hi All,I picked up an Advantest R6581T 8.5 digit multimeter recently which needed some repairs to get it working properly.The R6581T is very similar to the R6581, only without the AC options and possibly with some lower spec components.I have recorded a (so far) 5 part video series for it, I will add the videos here as each of the videos are published.Part 1:

author: TheDefpom
author_rank: Frequent Contributor
timestamp: October 20, 2022, 08:26:57 am
content: Part 2:

author: TheDefpom
author_rank: Frequent Contributor
timestamp: October 27, 2022, 06:03:05 pm
content: Part 3:

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 03, 2022, 09:02:51 am
content: Part 4:

author: Mickle T.
author_rank: Frequent Contributor
timestamp: November 03, 2022, 09:21:25 am
content: Thank you for the video!Below are sketches of the front panel connection diagram. Perhaps useful.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 03, 2022, 10:10:07 am
content: Thank you very much, that will certainly help.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 10, 2022, 08:51:00 am
content: Part 5:
Advantest Spectrum Analyzer R3361 Firmware - Page 1
Forum section: electronics / repair

author: Arcing
author_rank: Newbie
timestamp: November 04, 2024, 02:58:13 am
content: Does anyone have ROM firmware for the R3361 version C03 or newer?

author: serg-el
author_rank: Regular Contributor
timestamp: November 19, 2024, 05:50:28 am
content: Foto, user manuals and firmwarehttps://cloud.mail.ru/public/JrNG/hyy7L7xHU

author: wkb
author_rank: Super Contributor
timestamp: May 25, 2025, 02:32:33 pm
content: https://www.ko4bb.com/getsimple/index.php?id=manuals&dir=01_ROM_Images_and_Drivers/Advantest_R3361AJust programmed a set of EPROMs for my R3361A, works.
advantest spectrum analyzer U3641 - Page 1
Forum section: electronics / repair

author: Ken121
author_rank: Newbie
timestamp: December 26, 2019, 04:52:18 am
content: I have a aAdvantest spectrum analyzer U3641 and don't know where to start on fixing it. I turn it on and it does one sweep. I think it just does that on startup. Does anyone know anything about spectrum analyzer repair and where I might start because I don't have a clue. Any guidance would be a wonderful, wonderful thing.Thank you for taking the time to read this.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: December 26, 2019, 06:17:43 am
content: Start by putting a little more effort into describing what do you observe exactly and how is it different from what you expect. Perhaps, some pictures might help. Do you have a manual? Did you study some basic operation? Do you have schematics? Maybe a block diagram?

author: Chris56000
author_rank: Frequent Contributor
timestamp: December 26, 2019, 02:03:17 pm
content: Hi!https://www.opweb.de/english/company/Advantest_Corporation/U3641Chris Williams
ADVANTEST Spectrum R3272 gain defect - Page 1
Forum section: electronics / repair

author: franzy
author_rank: Newbie
timestamp: August 24, 2019, 02:14:22 pm
content: Hi alls,I have this spectrum analyseur, and before open, i would like to know if someone has had a similare problem.When I calibrate TOTAL GAIN, I have a message like:"calibration signal was not detected Please check CAL OUT signal"I have tested Call out signal (30Mhz -10dbm) with an other analyser, it is correct.So when I mesure Call out signal, i have -19dbm before -10dbm.I think i have problem with atenuators .What do you think about it ?Where a can find schematic ?Regards

author: CrazyTiger
author_rank: Regular Contributor
timestamp: August 25, 2019, 02:47:01 am
content: You can feed the 30MHz -10dBm signal back to the spectrum and measure, but this time vary the input attenuation,if the spectrum measures correctly on a different attenuation, likely the attenuator have a blown pad.Or set the input attenuation to 0 dB, this should connect the signal directly to the frontend bypassing the attenuator, if it measures correctly, likely attenuator is dead if it measures bad, the next stage is badOn my R&S FSEB, sometimes the mechanical attenuator relay gets sticky creating bad contact, so just varying the input attenuator setting, to make multiple contacts usually solves it
ADVANTEST U3641 Spectrum analyzer - Software issue - Page 1
Forum section: electronics / repair

author: biank88
author_rank: Contributor
timestamp: January 28, 2017, 09:23:15 pm
content: Hi there,I'm trying to repair my old spektrum analyzer (ADVANTEST U3641) which seems to have some problem with its firmware (I assume).In the attachment you can see the only window the instrument shows when it boots up, where it asks to install the system software.It seems to be possible to download the firmware via the serial port... but I can't find any info on the web.Do you have any clue? Thanks for your attention!

author: Fraser
author_rank: Super Contributor
timestamp: January 28, 2017, 10:01:42 pm
content: Your best chance of help is on the Advantest test equipment Yahoo Group.Someone may have a Firmware image that you can use. I am not sure how someone has managed to erase the firmware as such is not easy to do.Fraser

author: biank88
author_rank: Contributor
timestamp: January 29, 2017, 09:34:55 am
content: Thanks Fraser, I'll try on the yahoo group then.

author: Fraser
author_rank: Super Contributor
timestamp: January 29, 2017, 12:42:11 pm
content: There are many very knowledgeable people in that group. There is much sharing of firmware revisions. Sadly the U series of portable spectrum analysers are less well 'known' and somewhat of a mystery in terms of their inner workings. I have one that needed new electrolytic capacitors throughout. Every surface mount 100uF capacitor plus many others were leaking ! Worth checking on your unit. The inverter board was the failure in my unit due to electrolyte leakage but further invesigation revealed the poor state of the capacitors in all modules.It is possible that your unit has gone into the software boot loader as a result of a fault on the processor board or even the inverter board. Well worth a carefully look at the boards. The processor board contains all of the main memory with some extended memory for configuration on another board.I did a write up on my investigation into the U series Analyser on this forum in the 'repair' section.Fraser

author: Fraser
author_rank: Super Contributor
timestamp: January 29, 2017, 12:44:53 pm
content: Here is my experience with the similar U4941 Analyserhttps://www.eevblog.com/forum/repair/advantest-u4941-portable-spectrum-analyser-repair-by-fraser/

author: biank88
author_rank: Contributor
timestamp: January 29, 2017, 01:29:02 pm
content: Wow... thanks for this precious information.I'm going to dissect my unit too (even though I wished there was some magic "software" trick with the serial port).

author: Marcel G
author_rank: Contributor
timestamp: February 23, 2017, 07:56:40 pm
content: Hello sir,Maintenance: enter shift + 5 = Maintenance ModeInput password: enter 27466Regards and good luck,Marcel

author: s8472
author_rank: Newbie
timestamp: August 03, 2022, 11:50:39 am
content: Hi,Do you ever able to find firmware image for your spectrum analyzer?Regards,
Advantest U3661 no lock detection help - Page 1
Forum section: electronics / repair

author: tsunami38
author_rank: Newbie
timestamp: January 30, 2020, 07:41:21 pm
content: Hi to everyone, i' m new in this forum. I' m from Italy.I have an Advantest U3661 with error 900 no lock detection, there is someone that coul give me any suggestion to start the failure search?Thanks a lot in advance

author: LivelyLlama
author_rank: Newbie
timestamp: March 08, 2020, 05:35:51 am
content: Hi, sorry I didn't see this before!Your 2nd LO has drifted out of lock range. There are a few modifications you need to make to correct this, they aren't too hard. You may need to replace an MMIC. The cost is minimal. I have an entire writeup on this, let me find it and I will send it to you. I've repaired several of these, they are good units and this failure is very common.

author: pbloem
author_rank: Newbie
timestamp: March 28, 2020, 09:51:52 am
content: Hi @LivelyLIama,I would also be very interested in the writeup on this error, could you please email it to me too?Kind regards

author: Paul S
author_rank: Newbie
timestamp: April 29, 2020, 01:05:03 am
content: Hello, I'm glad I found your post. I have the same problem. I pulled all of the power supply boards and they are putting out the correct voltages. Please send me the fix. It would be appreciated. Just joined this forum. Do I need to send you my email address? Thank you, Paul

author: LOT52
author_rank: Newbie
timestamp: April 30, 2020, 03:08:01 pm
content: Hello,my Advantest U3661 shows the same problem, >Error 900 no lock detect<, but only in the frequency range below 3GHz.Above 3GHz it works fine.Can you help me?Thank you and best regards

author: Paul S
author_rank: Newbie
timestamp: May 14, 2020, 12:23:50 am
content: I was wondering if anyone has received a reply for this repair? I have not and would like to do it. Thanks, Paul

author: LOT52
author_rank: Newbie
timestamp: May 26, 2020, 05:20:38 am
content: Hello,I don't have a response too. Now, i've repaired the "no lock problem" by myself. In the next few days, i'll write a detailed description how to solve this problem. Anywone who is interested can receive a pdf-file, send me your email-adress to u3661@gmx.de and let me about 5 days for writing this paper.Best regards

author: tsunami38
author_rank: Newbie
timestamp: October 20, 2020, 09:37:30 pm
content: Hi, i m so sorry for my late but i had some health problem...if you can i will appreciate your help and your solutionthank you so much

author: tsunami38
author_rank: Newbie
timestamp: October 20, 2020, 09:41:15 pm
content: hi, i'm sorry but i had some health problem...if you can i would like to have your solution for repairing the spectrum. i'll send you an e-mailthank you so much

author: ttbelectronics
author_rank: Contributor
timestamp: April 08, 2021, 07:20:05 pm
content: Would you send me this information please?Thank you.

author: calin
author_rank: Regular Contributor
timestamp: July 31, 2023, 06:13:46 am
content: Sorry to revive such an old thread. Does any of you have the mentioned repair procedure and will it be possible to share please.Thank you !!
Advantest U3751 No Boot Device - Page 1
Forum section: electronics / repair

author: XTEC
author_rank: Contributor
timestamp: May 13, 2024, 03:29:54 am
content: I've seen a local ad for a used Advantech U3751 spectrum analyzer, selling for less than $100! Ad says it powers up, but is missing the boot device (see photo). I've seen some teardown photos in this post by Dgiese, and it looks like a CF card?https://www.eevblog.com/forum/testgear/advantest-u3751-(sa)-rf-unlocked-pll-issue/msg3876554/#msg3876554Anyone else know this SA? Thoughts on possibility to fix it? I've looked online and (not surprisingly) I don't see any firmware or drive image. Any kind person able to image the CF card for me (assuming it's just that)?Looks like servicing is by R&S, so not sure how much that might cost?I guess I'm just asking for thoughts on if this is worth a $100 bet?

author: m k
author_rank: Super Contributor
timestamp: May 14, 2024, 05:42:27 pm
content: Once someone, not me, bet heavily for a winner of Africa's Cup game when it was 4-0 and 15 min to go.The bet was correct, but result was 4-4.With luck the battery has been empty and auto detect is in the future.
Adventures in Fluke 8020B LCD MacGyver land.... - Page 1
Forum section: electronics / repair

author: MartolFart
author_rank: Newbie
timestamp: September 05, 2020, 10:55:46 pm
content: I have this pretty old DMM that developed LCD issues; a splotch in the middle of the screen was making the digit underneath pretty hard to read.... And replacement LCD is not easy to come by. So I took it apart anyway and tried to get the reflector off in one piece, but it just shredded... And it turned out the blotch was in the polarizing film somehow too, so it needed to come off which was a tedious task.... Once I got it off and tracked down some film on amazon, I cut it to size (making sure to get the correct angle 90 degrees to the front polarizer), it worked pretty good! My wife gave me some shiny paper to use as backing which worked a lot better than foil, but plain white paper worked pretty good too. I didn't bother with trying to seal everything back together since it looked fine to me as it was (but I might go back to plain white paper!) Had to do some futzing with zebra connector and clean the pcb contacts along the way as well. Here's a couple of pics.

author: lowimpedance
author_rank: Super Contributor
timestamp: September 06, 2020, 02:11:41 am
content: Usually the digits start to ' leach' ,so good that it's only the polariser etc as you could save the original LCD.My 8020A display was totally black and needed full replacement, luckily its a simple display with only a BAT. Low indicator. These types are readily available with leads attached. With some slight mechanical mods to the display holder and some small gauge wire soldering this retrofit looks the part and performs perfectly and will see out the remaining life of the meter.Search the forum for my first post here on what I did, but for complete instruction see MrModemheads website for a good write up.

author: MartolFart
author_rank: Newbie
timestamp: September 06, 2020, 10:12:06 pm
content: Yup, I happened on MrModemHead's 8020B tear down (I hope he found a replacement AC/DC button!) which got me motivated to see if I could do something about that splotch.... I thought others might be interested the polarizer and reflector replacement since replacement options are limited and/or more involved. Fluke would prolly charge a small fortune anyway....