hybridfree/eevblog-posts huggingface dataset:
Fluke 8846A repair - Page 1
Forum section: electronics / repair

author: mr_D
author_rank: Newbie
timestamp: June 30, 2021, 02:47:30 am
content: I have troubleshooting the power of Fluke 8846A.The power supply 5 voltage was broken. I tested Q20 and Q21 (follow the image on attachment section) and they were done.Now I want to know what are Q20 and Q21 (What is semiconductor type: Transistor, FET... and what are they code: name, code...) because I could not find them in the datasheet.It would be really awesome if someone in the know can enlighten me !

author: coromonadalix
author_rank: Super Contributor
timestamp: June 30, 2021, 03:11:29 am
content: seems to act like a diode, the picture seems to show a third pin unconnected ? or i did see it wrong ?

author: bob91343
author_rank: Super Contributor
timestamp: June 30, 2021, 05:21:36 am
content: Since it's in the power supply, I would guess NPN transistor. But without a diagram, it's just conjecture.Can you measure them with an Ohmmeter?

author: picburner
author_rank: Frequent Contributor
timestamp: June 30, 2021, 06:39:53 am
content: The dot "Q" indicates that the devices are transistors (or jfet/mosfet) with an magnified image or by reading the code on the top one could trace the device.

author: TMM
author_rank: Frequent Contributor
timestamp: June 30, 2021, 03:36:57 pm
content: Quote from: coromonadalix on June 30, 2021, 03:11:29 amIt's probably connected to a via underneath the transistor. On the LM393 nearby, pins 3 and 4 appear to be unconnected, but they definitely have to be as they are one of the comparator inputs and ground.The pins on the right side of J7 go to the AC secondary of a mains transformer, right? If so I would guess that the two transistors in question are MOSFETs to disconnect the secondary winding(s) under certain conditions (line overvoltage, delayed startup etc). The LM393 comparator nearby might be operating them. If this is the case then a short in the powersupply would explain them being blown, and you can work out if they should be NMOS or PMOS by the polarity of the connection and if the LM393 is pulling the gate high or low. Usually there will be a high value resistor connected from gate to source, and the comparator pulls the gate towards drain to turn it on. If it's just operating as a switch as I suspect then you can choose any MOSFET which is rated for the voltage, current and doesn't have an Rds-on which will drop too much voltage.

author: gamalot
author_rank: Super Contributor
timestamp: July 02, 2021, 08:04:17 am
content: They are FND337Nhttps://www.onsemi.com/pdf/datasheet/fdn337n-d.pdf
Fluke 8860A - Page 1
Forum section: electronics / repair

author: rsd
author_rank: Newbie
timestamp: September 08, 2023, 09:32:17 am
content: If in voltage auto range and with open leads connection, the measured input voltage keeps getting more and more negative. It resets at about -200mV, probably with the first range switch (the relays click). And then begins again.It also happens in the lowest two fixed ranges (there is no relay clicking between those two). With the higher sampling rate, it is charging faster. On Manuel it charges to over negative 1V. I did not take it apart yet. Wanted to check first if that is expected from a meter that old, or if somethings to be fixedSchematics are attached. Any Tips?

author: rsd
author_rank: Newbie
timestamp: September 08, 2023, 09:39:48 am
content: My best guess would be Q6 or Q3? Since those would only cause trouble on the lower ranges. See attached picture.

author: rsd
author_rank: Newbie
timestamp: September 08, 2023, 10:34:37 am
content: Measured voltage across a 100k Resistor is about 0.003 to 0.000mV, so 0.030nA leakage? That seems to be fairly low. So it is probably pulsed, which makes sense in terms of the different rates for different sampling frequencies. So that does rule out the marked JFETs from my previous answer.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 08, 2023, 10:59:22 am
content: It is normal for a high impedance input to drift from the bias current. 30 pA is usually considered OK, though not great. Specs are often like < 50 pA with a few meters also specifac <20 pA.The dependence on the sampling rate suggsts that much of it is from the switching part / charge injection at the FETs. I see no extra precharge circuit or accurate compensation of the gate charge. For the given circuit I would consider the behaviour normal to good.

author: rsd
author_rank: Newbie
timestamp: September 08, 2023, 12:24:42 pm
content: Thank you very much for the clarification.
Fluke 8860A DMM - ROM help! - Page 1
Forum section: electronics / repair

author: wn1fju
author_rank: Frequent Contributor
timestamp: January 24, 2018, 02:45:04 pm
content: I have a Fluke 8860A that is locked up on start. I dumped out the ROM and it appears that bit 0 and bit 1 are stuck. Is there anyone out there withan 8860A that would be willing to dump their ROM contents and post the binary? It is a 4Kx8 chip that is socketed on the vertical control board on theright side of the unit. Very easy to get to. Thanks.

author: langlv
author_rank: Contributor
timestamp: April 21, 2021, 10:30:54 am
content: Hello wn1fjuYou you still need these ROM images? I can open my 'new' 8860A on next rainy day to make a copy.bestLang

author: wn1fju
author_rank: Frequent Contributor
timestamp: April 21, 2021, 11:34:36 am
content: Thanks for the offer. I eventually gave up on the 8860A and stripped it down for parts.

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 14, 2023, 12:46:48 pm
content: Resurrecting the thread.I would be interested in the rom dump for the u9 chip on the A3 control board. I have a 8860A which also seems to suffer from bit-rot.So if you still able to make a dump, that would be really great.
Fluke 8920a malfunction occurs again, how can I repair it(already ruled out) - Page 1
Forum section: electronics / repair

author: daisizhou
author_rank: Super Contributor
timestamp: May 21, 2023, 11:36:02 am
content: Hello everyone,A few days ago, my 8920A malfunctioned. I tried repeatedly pressing the "LO RANGE ENABLE", "HOLD/AUTO", and "STEP UP" buttons.Sometimes it returns to normal, but sometimes it has no effect.I disassembled these three switches and cleaned the inside of the switches,And I cleaned the connection between the lower part of the switch and the PCB,But the fault is still the same.The current fault phenomenon is that after starting up, the digital display shows 700V full range,Pointer gauge right full range,Sometimes it swings repeatedly,I mean, when it reaches position 0, it immediately turns right.I don't know how to repair it. If you know, please let me know. Thank youmanual-->(https://www.elso.sk/media/download/pdf/fluke/man/Fluke_8920A_8921A_Manual.pdf)

author: daisizhou
author_rank: Super Contributor
timestamp: May 22, 2023, 12:45:43 am
content: I will conduct the inspection according to the inspection forms 4-9Step 17, the voltage between TP201 and TP202 is 1.134VStep 33、34, TP3 is 0.883VStep 45、46 TP1 is 2.016VStep 52 checking Q3 Q4 Q5 Q6Continue to check according to inspection forms 4-10. I am not sure what these represent and cannot proceed to the next step

author: m k
author_rank: Super Contributor
timestamp: May 23, 2023, 08:01:46 am
content: Are both meters acting equally?Is it always positive?Since both meters are acting up you can expect that the problem is the measuring and not indicating that measurement.One candidate is a kneeling supply voltage.If meter change is instant you can expect a contact problem.If it takes more time then a faulty component is more possible.

author: daisizhou
author_rank: Super Contributor
timestamp: May 23, 2023, 09:55:08 am
content: Thanks.I removed some traces of corrosion under one resistor.Currently testing and observing, I hope the fault has been eliminated
Fluke 8920a Voltmeter Repair Need Help - Page 1
Forum section: electronics / repair

author: daisizhou
author_rank: Super Contributor
timestamp: May 28, 2023, 10:35:38 pm
content: Hello everyone,My fluke8920a voltmeter has been under repair,It's malfunctioning very strangely,I tested it for a long time,it's still faulty now.Below I will describe its failure phenomenon,After power on,Press the "LO RANGE ENABLE" button，The analog pointer keeps swinging back and forth,I don't know what's broken.I try to plug in a 50 ohm load,And press the "LO RANGE ENABLE" button again,The malfunction is still the same.In order to explain the fault more clearly, I took a video,Please let me know if you know or you have the same glitch, thankshttps://youtu.be/l_2e7JcHB2grepair manual-->https://www.elso.sk/media/download/pdf/fluke/man/Fluke_8920A_8921A_Manual.pdf

author: daisizhou
author_rank: Super Contributor
timestamp: May 29, 2023, 03:05:25 am
content: S202 switch

author: coromonadalix
author_rank: Super Contributor
timestamp: May 29, 2023, 02:32:35 pm
content: check the logic going into U205, it may have been damaged

author: daisizhou
author_rank: Super Contributor
timestamp: May 29, 2023, 08:22:03 pm
content: thank you for your reply。I checked U205 it is working，Sometimes press "LO RANGE ENABLE" it is normal, sometimes it is faultyI wiped the motherboard with ethanol and baked it, the fault disappeared for a while, but the fault reappeared after a while
Fluke 893A (1970) differential voltmeter - Page 1
Forum section: electronics / repair

author: RikV
author_rank: Regular Contributor
timestamp: October 21, 2023, 10:19:18 pm
content: A few months ago I acquired one of these (2+1digit KVD) and although I already own a 557 (4+1 digit KVD) and even a HP3420B (6+1digit KVD) The 893A is very interesting since it uses 4(!!) different reference voltages in it's bridge setup: 1.1V; 11V; 110V and 1100V! This means there is NO input voltage divider on the 100 and 1000V ranges: when the null meter reads "0", input resistance is infinite since no current is flowing from the DUT!One little problem only: after replacing the suspected Elcos the unit does not work. Reference are there and in spec but the schematics I have are too unreadable to be of any use.Artek does'nt have these, so this is my request: Has anyone out there usable copies of this manual?

author: srb1954
author_rank: Super Contributor
timestamp: October 21, 2023, 10:56:15 pm
content: KO4BB's site has a reasonably good scan of this manual. The text and the schematics seem quite readable but the photos are less clear.I have a hard copy of this manual, date May 1969, and will scan a few pages if you have some particular pages where you need clearer versions. I won't scan the whole manual as that would require undoing the brittle plastic binding combs, probably destroying them in the process.
Fluke 893A AC DC Differential Voltmeter - high pitched whine - Page 1
Forum section: electronics / repair

author: mapleLC
author_rank: Frequent Contributor
timestamp: July 06, 2022, 01:03:08 pm
content: I have a Fluke 893A AC DC Differential Voltmeter that I want to use more often, but its making a terrible high pitched sound between 8 and 10k hz coming from what seems like the card identified in this photo. Service manual link also.When I unplug the lead to pin 2 on this board the sound stops. What could be responsible for a sound like that? I have never encountered something like this, so I was hoping it was something obvious. I am not certain its this board, only the behavior of pin 2.https://www.download-service-manuals.com/en/manual.php?file=Fluke-10130.pdf

author: Kleinstein
author_rank: Super Contributor
timestamp: July 06, 2022, 01:28:49 pm
content: There are transforms for the reference signal and the recorder output, that run at 3 kHZ and thus in a well hearable range. Some tone may be normal an hard to avoid.

author: mapleLC
author_rank: Frequent Contributor
timestamp: July 06, 2022, 02:00:49 pm
content: It's quite loud, almost to the level of an error tone you might here. It would drive a user crazy if you had to sit near it all day.

author: Kleinstein
author_rank: Super Contributor
timestamp: July 06, 2022, 06:55:54 pm
content: I would consider the transformers the main suspects for a beeping noise. There are a few things that can make tranformer noise worse:- added DC background magnetization / asymmetric drive- increased drive voltage, so the core gets closer to saturation- the winding getting mechanically loose so it can move / resonate- rubber used for acoustic isolation getting hard.Magnetistriction can produce twice the frequency of the voltage - so this would be some 6 kHz.At least things like loose coils at the transformer can be fixed and some glue can also help to dampen mechnical resonances.
Fluke 9100 Calibrator repair - Page 1
Forum section: electronics / repair

author: Machlee
author_rank: Contributor
timestamp: March 27, 2023, 04:53:52 am
content: Our calibrator failed after unhappy connection to seems like an ammeter.The following components were found burnt and replaced on the "9100 Analog PCB output switching, open sense detect & analog bus":K012,K003, K004,F004After that the instrument started issuing "SYSТЕМ TRIP: 9508 UNEXPECTED Power amp overload The Program Counter is 48EB0" on boot. And I don't know what to do next.Have seenhttp://www.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Datron/Datron_9100but there aren't the description.
Fluke 93 Scopemeter Ch B volts/div. switch problem. - Page 1
Forum section: electronics / repair

author: Paceguy
author_rank: Regular Contributor
timestamp: August 26, 2023, 05:10:50 pm
content: I have a Fluke 93 scopemeter. There is a problem with channel B. The mv/v switching doesn't completely work. When auto set is pressed, ch b is at 2V. I cannot get it to go up any further when pressing V. I can get it to go to 1V, 500mV, 200mV, 100mV and then 50mV where it stays when pressing mV, but again no change if I press V. The circuit board and button membrane are clean and contact properly. Does anyone know which component(s) could be suspect?Thanks in advance!
Fluke 931B repair - Page 1
Forum section: electronics / repair

author: Rax
author_rank: Super Contributor
timestamp: October 24, 2023, 03:08:27 am
content: As one's splendid "sub-ppm" levels calibration/hobby lab goes, once you think you've figured your 8 1/2 digit measurement on your calibrator calibration, your ACV differential meter poops out.My 931Bs "fourth digit" doesn't want to adjust smoothly and I suspect R37 is not tracking well. It's a hermetic pot. I wonder if anyone has run into similar issues and figured out a solution. Other than getting a replacement - and I assume throwing out its cal/adjustment - I can only think of poking a hole and spraying some Deoxit in there (it's a ww, so no reason for FaderLube), and letting it dry. Then working it and hope it's smooth like a baby's buzzum.The other issue is the mechanical dial is not quite going from 00 to 100... And yes, I absolutely want to keep the calibration untouched!How would you tackle this?

author: m k
author_rank: Super Contributor
timestamp: October 30, 2023, 08:05:17 pm
content: Why R37 and not the angle gear?

author: Rax
author_rank: Super Contributor
timestamp: October 30, 2023, 08:18:19 pm
content: Quote from: m k on October 30, 2023, 08:05:17 pmI don't think I'm getting mechanical slippage - the symptom is I sometimes don't get progressive, expected activity from the meter upon adjusting (I don't get any activity) - but it's a great question, I should probably take a closer look at that.When it's behaving "expectedly," I seem to get measurements that are scary close to what I expect, given what seems a pretty simple design for an ACV instrument.
Fluke 9640A-LPNX RF Reference Source - Power Supply issue - Page 1
Forum section: electronics / repair

author: tekfanatic94
author_rank: Newbie
timestamp: October 13, 2023, 01:55:51 pm
content: Hello everyone,I have a Fluke 9640A-LPNX in my hands with a problem identified with the power supply.According to the manual I should have the following voltages: +5Vdc, -8.2Vdv, +12Vdc, +20Vdc, +38Vdc.After measurement I only found +5V and +12V.I suspect some components were removed (see photos).Do any of you have the service manual with diagrams or detailed photos of the power supply?Thank you in advance for your help

author: coromonadalix
author_rank: Super Contributor
timestamp: October 13, 2023, 02:17:57 pm
content: I think you already know, it will be very hard to get more than a few user manual or specs sheetslike theseshttps://download.flukecal.com/pub/literature/9640lpnximeng0000.pdfhttps://download.flukecal.com/pub/literature/9640LPNXgseng0000.pdfhttps://assets.fluke.com/manuals/9640A___gseng0200.pdfhttps://www.minerva-calibration.com/wp-content/uploads/2017/07/Fluke-9640A-product-manual.pdfand no leaked schematics? if there is ?with some part number in one of the linked pdf, call fluke to see how much this part cost ... mostly or surely expensive ?

author: tekfanatic94
author_rank: Newbie
timestamp: October 13, 2023, 06:06:59 pm
content: Thank you for your reply. Indeed, it's almost impossible to find schematics.I'm just looking for photos to identify the missing components.So if anyone has this model and can take photos, that would be greatThanks to all
Fluke 97 kernel test anomaly - Page 1
Forum section: electronics / repair

author: Maxis
author_rank: Contributor
timestamp: September 05, 2019, 10:33:29 am
content: Hello Dear forum members,I've recently acquired Philips PM97 (Fluke 97) scopemeter in a hope to get it fixed. It dates back to 1992.It has a very fuzzy display (completely unreadable and not stable). As usual 4 aluminum caps replaced and the acid damage was repaired, LCD bias circuit also repaired, uP board LCD digital logic tests+power supply tests were done. Observations: by design the scopemeter runs not at 5.00V, but at 5.321V. The resistor network and the placement of components is not exactly the same like in the service manual in the secondary power supply section.Before bashing zebra strips, I was thinking about video RAM buffer (D1206) being likely damaged and possibility to test it. And here is a puzzling bit.When I run the kernel test by shortening TP216 to GND the scopemeter follows what's written in the manual with "walking" zeros on AD0..AD15 on every TP217 grounding.But then, on the 16th TP217 action,instead of testing just the D1204 RAMand reporting test results, my PM97tests both D1204 and D1206This test reports PASS (pin6 of the X1201 I see 0.5s toggling).On the 17th grounding of TP217, the XON is sent. However, theD1206 chip select remains high(no second RAM test is performed) and pin6 of X1201 is not toggling any more but held LOW (showing that this is the end of tests or maybe crashing). This doesn't indicate the error, but likely it indicates a different ROM mask version not the same as described in the Service manual.By grounding after that TP216 doesn't help o-scope going back to the normal operation interrupting the kernel test. The o-scope is stuck and only toggling ON/OFF will bring it back to normal (still very fuzzy LCD but full response to the buttons).My question is: have anyone observed so far the same behavior of KERNEL TEST?My dilemma is: it's either the RAM anomaly which crashes the test (still produces a good test because of XON being sent and pin6 of X1201 is held low), or the older ROM MASK FW with algorithm different than mentioned in the manual.The MCS96 ROM mask isLCDS0 ver 2.01One more question, have anyone already successfully performed the DFU? It seems like there is a way to backup the calibration constants and reflash the more recent FW. For that the tool is needed (likely running under DOS/win3.11). Does anyone has this tool?Thank you for your help.
Fluke 97 Scopemeter LCD needed. - Page 1
Forum section: electronics / repair

author: Paceguy
author_rank: Regular Contributor
timestamp: September 30, 2021, 12:37:01 pm
content: My Fluke 97 Scopemeter's LCD screen in damaged and unserviceable. Would anyone here know where I can get a replacement? Can I substitute the LCD from a 92, 93,or 95?

author: asis
author_rank: Frequent Contributor
timestamp: October 01, 2021, 10:35:38 am
content: Hi,Ask this seller.https://www.ebay.com/usr/skye-electronics/

author: EHT
author_rank: Frequent Contributor
timestamp: October 01, 2021, 08:52:03 pm
content: OK.. but trying to sell a 199C LCD panel for more than a complete working meter is worth (375 EUR for the display!!!)https://www.ebay.com/itm/Fluke-199C-topcover-with-LCD/184819611142
Fluke 97 Scopemeter reset error - Page 1
Forum section: electronics / repair

author: kamocat
author_rank: Newbie
timestamp: April 05, 2022, 12:06:48 am
content: Hi all,I have a Fluke 97 which has been working happily for many years, but just last week it decided it to act up.It starts out measuring fine, and then after a few seconds it beeps and warns "** Error *** Please reset the instrument ***"And then the screen blanks out and flashes the error message with a beep every second.I have tried a system reset by powering off, holding the LCD button, and powering on. This doesn't seem to have any effect on the issue, although I do believe it does reset because my timescale, trigger, and volt scale are set back to default.Does anyone have an idea of what might be the issue? The service manual is very detailed but I don't really have another scope to troubleshoot with.(I found the service manual in theOld Fluke Phillips 97 / 96Bthread)

author: m k
author_rank: Super Contributor
timestamp: April 09, 2022, 03:50:35 pm
content: Are all modes equally bad?

author: KRISTOFFER
author_rank: Contributor
timestamp: October 07, 2022, 04:11:37 pm
content: It is a pig of a job but you need to do some continuity checks on the double sided PCB of the top board. Back in the days when these instruments were fitted with ni-cads, the boards would slowly corrode from the battery gasses. I have done a few where everything is fine until you perorm certain functions then they either power off or do stange things. In a nutshell the tracks can supply enough current to get the things up and running, but any voltage drops, when say the processors need more current, and it all goes wrong. You will notice if you get the chance to open a good few of them up, that there are wire jumpers added all over the boards that were not from oringinal production.
Fluke 99 Series II Scopemeter Parts - Page 1
Forum section: electronics / repair

author: DreadfulGranola
author_rank: Newbie
timestamp: January 22, 2022, 01:52:06 am
content: So I recently picked up a 99 Series II Scopemeter and I'm wanting to do some work to get it back on its fee- *ahem* probes. The main problems im having are with it's screen.The screen is fairly readable in the bottom left and center but fades near the top and bottom right corner. Also the backlight is a bit dim. I'm not sure if theres something wrong with the EL pannel itself or if theres something wrong with some components on the board (I guess I could tear it apart and find out).I can confidently replace the components that are bad and debug them but the problem I'm having is finding a good and (relatively) inexpensive source for parts. I know I could go on eBay and find a donor scopemeter but I really dont want to spend a mass amount of money on something thats going to become a husk unless i really have to.Anyone have any suggestions?

author: M0HZH
author_rank: Regular Contributor
timestamp: January 22, 2022, 02:28:21 am
content: Sounds like the display is at fault. Typically it would be a display module that includes the actual screen plus a PCB with driver/interfacing and sometimes they're available on ebay / Aliexpress if you search for the part number. I have the Fluke 867B which is from the same era and it is known for similar display issues, it's not excluded it might use the same display (867B displays are relatively easy to source).

author: DreadfulGranola
author_rank: Newbie
timestamp: January 22, 2022, 02:50:38 am
content: I just checked it out and I couldn't find any parts using a part number (the ordering number is all I could find for the parts) or by using the name of the part in the service manual.Noting on eBay or AliExpress

author: KRISTOFFER
author_rank: Contributor
timestamp: September 26, 2022, 08:26:02 pm
content: Clean the 3 elastomers but be warned that once you remove them it can be quite tricky to get them back into alignement. Could be someone has already replaced the screen in the past and not adjusted the position relative to the circuit board. Have a look at the top corners of the display unit and you will see two adjustment screws. They are deliberately off center so you can theoretically position the LCD in esactly the right position by rotating them with a flat blade screwdriver.
Fluke DSP-4000 Screen Flickering - Page 1
Forum section: electronics / repair

author: VincentK
author_rank: Newbie
timestamp: September 01, 2022, 05:16:24 pm
content: Hi lads,I am security and CCTV installer and working with CAT5 & CAT6 cabling regularly. However, I am not admin for data center and brand new Fluke DSX is not in my budget.So I have old DSP-4000 that helped me a lot. Just recently it stopped working. When turned on screen flicker just like in this picture.Is there anyone had same issue? I this LCD panel or is it more like main board issue? Please help.Thanks,Vincent

author: VincentK
author_rank: Newbie
timestamp: October 01, 2022, 10:03:35 am
content: Bump!?
Fluke Etherscope network anayzer not switching ON - Page 1
Forum section: electronics / repair

author: ntj77
author_rank: Newbie
timestamp: June 06, 2020, 08:47:33 am
content: Hello, I need help with my Fluke Etherscope series-I network anayzer which is not switching ON. When I press the power button, the green power ON LED on the front panel glows steady but no other signs of life. The LCD display appears dead, cooling fan remains OFF and the other 4 LEDs on the front panel are also dead. I have opened the device, checked the PCB thoroughly and didn't find any visible electric or mechanical damage. The battery is in good condition and holds charge. Can someone share a schematic or any other repair information please?
Fluke F117 bricked - Page 1
Forum section: electronics / repair

author: najrao
author_rank: Regular Contributor
timestamp: September 30, 2021, 01:06:21 pm
content: I continue from previous, old post, " F117 "fatal" error".Can anyone give me data on: Test points on the pcb, voltages, waveforms. There are many TP's. Fluke do not publish such in a manual. May be a kindly F117 owner can check it out for me? Thanks.NAJRI
Fluke Hart 1590 Repair - Page 1
Forum section: electronics / repair

author: kevinbrennan
author_rank: Newbie
timestamp: August 12, 2024, 05:15:59 pm
content: Good Morning. I'm searching for repair docs for a fluke hart 1590 super thermometer. No longer supported by fluke.Specifically I have a dead computer section of the instrument, if anyone with docs or knowledge of the instrument can share would be highly appreciated.Note the 1575 docs would help as well, which is a lower precision instrument in the same family.Best Regards,Kevin B

author: zorktronics
author_rank: Newbie
timestamp: October 04, 2024, 06:50:51 pm
content: Hi Kevin I also have a 1590 on my lab to do a repair and need the schematic. If you found it will be very helpful. About 2 years ago the lcd was damaged and with some work on the bios of the video board i could use the instrument with a vga monitor. On another repair the U3 74ls08 of the isa interface board had to be replaced, take a look on this board and maybe it will be your problem.
Fluke LinkRunner AT 2000 internals pictures? - Page 1
Forum section: electronics / repair

author: ckambiselis
author_rank: Regular Contributor
timestamp: August 16, 2019, 09:05:37 am
content: Hi, does anyone have any pictures of the internals of the LinkRunner AT2000, I'm looking at a used unit that might only have a broken LCD or something and would be nice to see the insides before buying it.

author: gabrieldevriendt
author_rank: Newbie
timestamp: June 02, 2024, 03:43:22 pm
content: You're still searching for it?I'm new here and my Linkrunner AT 2000 with fw 2.5.4 build 1110, kind of unique piece I think, is for sale now because I bought the Aircheck G3 Pro kit bundle

author: WEL0058
author_rank: Newbie
timestamp: September 06, 2024, 05:57:33 am
content: I bought a “for parts” Fluke AT2000 which had no display. Also have a Net Alley AT2000 which was dropped and no backlight. Looking for a schematic for LinkRunner AT-1000/2000. There is basically no difference in hardware between the 1000 and 2000. So far only difference seen is the SFP transceiver shield missing, no SFP opening and $1000 in price between the 1000 and 2000. Difference would be in BIOS/firmware.

author: WEL0058
author_rank: Newbie
timestamp: September 06, 2024, 06:08:33 am
content: My first photo did not upload. Also did a PCB board cleaning
Fluke meter 28II help part I.D. - Page 1
Forum section: electronics / repair

author: lynnw
author_rank: Newbie
timestamp: August 21, 2021, 03:30:56 am
content: Can anybody tell me what part this is on the Fluke 28II input, circled in red U18. I think it is a voltage reg. need to know spec. of it. thanks

author: fzabkar
author_rank: Super Contributor
timestamp: August 21, 2021, 05:36:07 am
content: http://www.smdmark.com/en-US/search/code?id=radM4041DIM7-ADJ, Texas Instruments, adjustable Precision Micropower Shunt Voltage Reference, marking RAD, SC70-5:https://www.ti.com/lit/ds/symlink/lm4041-n.pdf

author: lynnw
author_rank: Newbie
timestamp: September 10, 2021, 02:02:35 am
content: thank you so much lynn
Fluke Microscanner Pro remote unit - Page 1
Forum section: electronics / repair

author: Ranayna
author_rank: Super Contributor
timestamp: August 28, 2021, 02:45:52 pm
content: Hi everyone,i have a faulty Fluke MicroScanner Pro.The unit was in service for now many years, and apart from once breaking a pin on one of it's RJ45 plugs, it worked flawlessly over the years.But now it developed an error that caused quite some extra work. Because it always showed an error on two wiresIt took me quite some time to realize that not my crimping skills failed, but the testerI was not able to get the error on a picture, but it showed a fault on pair 3/6. Not open, just "Fault" with 3 and 6 blinking.I took apart the remote unit, an immediatly, even before i saw the fault, i *smelled* it:That poor resistor got *toasty*. I assume that the unit was connected to non-Standard Power over Ethernet. Otherwise i have no idea what could have caused that.After i removed the resistor, the error on the main unit changes to "Open" at 3 and 6.Now i have no idea though what value the charred resistor had. If i just short it, the main unit shows a short between 3 and 6.Since the other resistors are all different, i strongly suspect that i need a specific value as replacement.I also do not want to tinker too much with different values, because the pads and a trace directly below the resistor are already lifted.I was not able to find teardown pictures of the remote unit, let alone schematics. Any ideas what that value could have been?

author: Ranayna
author_rank: Super Contributor
timestamp: August 31, 2021, 02:46:50 pm
content: No one? I guess i will have to start tinkeringThere is only one thing i can be sure of: The value has to be different than R1, R3 or R4, so that the main unit can detect a switched pair.Next assumption: Since R1, R3 and R4 are all in the E24 decade, i think R2 likely is as well.Further assumption: Since R1 is low, something suggests that R3 might also have been low.Final assumtion: There is some logic in those values.Concluding, i suspect that 300 Ohm might be a value worth trying...

author: 2N3055
author_rank: Super Contributor
timestamp: August 31, 2021, 03:03:27 pm
content: MAybe this can help?https://www.eevblog.com/forum/projects/reverse-engineering-the-fluke-wireview-identifiers/

author: Ranayna
author_rank: Super Contributor
timestamp: August 31, 2021, 05:00:45 pm
content: I found that topic while searching for schematics. These remote units look very different, and they also serve a different purpose than mine.And while the Microscanner Pro has similar identifying remotes available, i do not have these, so i cannot compare.I totally missed the Question about the Microscanner 1 on the last page though. Sadly unansweredI will fiddle around with values this or next evening. But i do not have a 100 meter ethernet run available to properly test the values.
Fluke model 840a/b or 841a/b galvanometer - Page 1
Forum section: electronics / repair

author: Tj138waterboy
author_rank: Regular Contributor
timestamp: January 02, 2021, 06:37:15 pm
content: Does anyone have one of these units or schematics. Interested to know how it would compare to hp419/fluke845

author: doktor pyta
author_rank: Frequent Contributor
timestamp: January 03, 2021, 03:45:24 pm
content: I'm not 100% sure but ranges suggest this could be Fluke 540B galvo section sold as a separate instrument.If so, it has LOW input resistance (magnetic modulator) so completely opposite of hp419 and F845.Update: '840A' sequence appears in the F540B manual in galvo related parts.

author: Tj138waterboy
author_rank: Regular Contributor
timestamp: January 04, 2021, 11:54:39 am
content: I have found one picture in a sales manual that appears to have this unit sitting inside a bigger backpack unit. From what I can find while waiting for my unit to arrive with missing power cord is that in picrures it was a non grounded plug with a box to modify from 110v to 220v just a few inches after the wall plug. The old picture background is the backpack unit.
Fluke multimeter 8020A repair - Page 1
Forum section: electronics / repair

author: Ek143
author_rank: Newbie
timestamp: November 18, 2022, 02:37:21 pm
content: Hello,I bought a fluke 8020A second hand. It came with a broken lcd.Before I repair it with a new lcd, I want to know if it is still working as expected.When I do measurements with my scope in the main IC (AD converter/lCD driver, Fluke version of Intersil 7106) I see a (expected) square wave of 4.8v pp as expected at the lcd driver pins, but as far as I can see, the only digits Which seems to be active is -1(min and one)So it seems the dmm is always in Ohm measurement (overload) independent of the switches.Does anybody know what the problem is, is this a certain mode of the main IC?

author: Andy Watson
author_rank: Super Contributor
timestamp: November 18, 2022, 07:50:37 pm
content: Somewhere on the main chip, there should be a reference voltage (pin3238). If this is not present/incorrect, the chip will display overload.How is the display broken?

author: Ek143
author_rank: Newbie
timestamp: November 18, 2022, 10:50:25 pm
content: Thanks for your answer. Not thought About that option with wrong reference voltage.Tomorrow I Will check that.The LCD was totally black and the liquid cristal had leaked. So it was unusable. I bought an universal replacement lcd which I have to solder on the PCB.

author: wim.de.jong.59
author_rank: Newbie
timestamp: November 19, 2022, 03:27:58 pm
content: Als je het interessant vind, ik heb nog wel een origineel LCD en diverse 8020A/B reparatie onderdelen. Laat maar weten.Mvrgr., Wim

author: Ek143
author_rank: Newbie
timestamp: November 19, 2022, 10:50:56 pm
content: Dank voor je reactie, ben ik zeker in geïnteresseerd.Ik heb je een PM gestuurd.

author: lowimpedance
author_rank: Super Contributor
timestamp: November 20, 2022, 12:21:41 am
content: The lcd failure is common, and usually the only problem generally with these old meters. Is it clean inside, the switches been 'exercised' enough to help break up contact contamination, particularly if it has been unused for a long time.With a bad lcd that will be most likely.As for the lcd if you're up for a bit of work there is a modification that mechanically fits a modern lcd with pin contacts.Looks great and brings these old timers back to life for years to come.Head over to Mr modemheads website for an easy to follow how to.http://mrmodemhead.com/blog/fluke-8020a-lcd-replacement/

author: wim.de.jong.59
author_rank: Newbie
timestamp: November 25, 2022, 08:10:40 am
content: Beste Edward,Stuur de meter anders op naar me, of kom langs. Ik heb die meters vroeger gerepareerd in de jaren '80 toen ik bij Fluke werkte.Verder heb ik alle spullen thuis om die meter ook te kalibreren en heb diverse onderdelen om te repareren.Wim de Jong, 06 4714 9944En ja, ik heb een nog goed werkende 8020A (maar die is niet te koop) en diverse 8020B PCB's, maar alleen voor onderdelen.Mvrgr., Wim.
fluke multimeter leads warning error - Page 1
Forum section: electronics / repair

author: m3vuv
author_rank: Super Contributor
timestamp: August 18, 2020, 07:01:32 am
content: Hi all,i had this issue with my 83v meter,it would constantly bleep and flash a leads warning,removing the amps fuse stopped it but not a solution,i read it was the lead sockets dirty,i tried all sorts of cleaner on them to no avail,chinese replacements were £20 ish from fleabay,i thought well ive nowt to loose here goes,i unsoldered the connector block from the meter,put it in a sock and threw it in with my washing,gave it a couple of days to dry in the airing cupboard,hey presto cured it,that was about 6 months ago,its never done it since,thought i would share this 73 m3vuv.
Fluke NetDAQ 2640/41A Stuck In Boot Loop - Page 1
Forum section: electronics / repair

author: EE54
author_rank: Regular Contributor
timestamp: August 11, 2023, 02:03:56 pm
content: Hello, I have a Fluke NetDAQ Model 2640/41A with the 20 channels input module.When powered on, the display light up for a few secs, I hear a click, repeat ad infinium.A cursory inspection of the insides shows nothing out of the ordinary.Any idea what to check next? I'm not very familiar with this model.

author: EE54
author_rank: Regular Contributor
timestamp: August 11, 2023, 05:13:40 pm
content: After a bit of digging, I managed to narrow down the problem to the A1 board, specifically, the U10 power management IC (LTC 694).The damn thing keeps pulling its Reset pin LOW every time I hear that click, causing the CPU to reset.The service manual said that this pin will be pull low if Vcc is <4.65VDC, I measured 4.89VDC.Gonna try and bypass U10 when I have more spare time to see if this IC really is to blame for all this.Link to the service manual:https://xdevs.com/doc/Fluke/2640A_2645A/FLUKE%202640A%2C%202645A%20Service.pdf

author: EE54
author_rank: Regular Contributor
timestamp: August 11, 2023, 11:07:15 pm
content: Unfortunately, that wasn't it.Even with the IC removed, the problem still persist.Back to square one I guess.On another note, I need a better soldering iron, took me 10 mins to remove the IC due to the large ground plane.

author: EE54
author_rank: Regular Contributor
timestamp: August 12, 2023, 06:24:56 am
content: After a bit more digging, it seems that the Microprocessor itself can drive the POR* signal low for about 1 us, which match the measured pulse.So the problem could be with the firmware it seems.

author: tridac
author_rank: Regular Contributor
timestamp: August 12, 2023, 12:05:39 pm
content: Sounds like a watchdog timeout, power on self test fault. If certain conditions, or self test fails to complete within a timeout period, the processor issues a reset signal. Could be anything, but for starters, is there a backup battery anywhere in the system ?. That reaching end of life, calibration constants etc, could be the cause of the problem. Otherwise, ram or other hardware failure. Unplug all accessory modules as well...
Fluke OptiView Series III Help (what's this connector) - Page 1
Forum section: electronics / repair

author: martonbaksa
author_rank: Newbie
timestamp: June 09, 2020, 03:49:53 am
content: Hello all!I have a Fluke OptiView SIII. I bought it parts/repair hoping it would be something simple. It might be. I am still unsure. There's 2 boards in here -- 1 an Intel Pentium Based mini tablet PC. The other the Fluke Networks add in card. I can't get the 2 to talk to each other. I was able to repair the tablet PC portion. It needed a CMOS clear because the coin cell battery was just flapping in the breeze. The network aquisition card is giving me trouble.The way I think this works is it's some Intel NIC driver that Fluke hacked together. It says I need to set the NIC TCP/IP settings to specific values. I've done this and they save. It just says that the network cable is still disconnected and the OptiView Program tells me kindly that my settings are wrong. The data module powers up and flashes white LEDs on boot. The reset button flashes a green LED. The fans also spin.There's an unpopulated Sodimm looking slot. I'm debating if that's possibly the cause of the issue and if that's something that's required for this to work. I can't see any pictures online if that's the case. I've tried installing DDR1 sodimm like the other board needed but that didn't seem to fit, they look awwwfulllyyy similar and it nearly works.Here's a bunch of photos, hope they help:https://imgur.com/a/eWUR9l2I really hope I can fix this ~~ I'd love to own one of these and use it too :>PS. any service manuals would be nice, I can't find them onlineBest,MB

author: martonbaksa
author_rank: Newbie
timestamp: June 09, 2020, 09:06:07 pm
content: It's DDR2 SODIMM. I should've figured it out sooner.I found an old stick of it laying around. That fixed all the problems.
Fluke overmoulding has peeled off - Page 1
Forum section: electronics / repair

author: razirafi
author_rank: Newbie
timestamp: April 22, 2023, 08:09:20 am
content: Hi to all, I have a Fluke 179 that has served me well for about ten years since purchasing it. Recently the overmoulding on the bottom half of the case has peeled off. May I know if others have experienced this and if this can be reattached? I tried using cyanoacrylate but it did not hold up. I also tried using Permatex Clear Adhesive Sealant 80050 but it still failed. I am also wondering if this is covered by the Lifetime Warranty of this product. I have seen on Ebay an original bottom case for this model but the price is quite expensive. Any thoughts on this?

author: Psi
author_rank: Super Contributor
timestamp: April 22, 2023, 08:14:24 am
content: You could email fluke and ask if they can do anything, they are a pretty nice company.

author: razirafi
author_rank: Newbie
timestamp: April 22, 2023, 08:45:04 am
content: Hello Psi, thank you for your reply. I will try that and see if they will be abe to help me out. I just needed to know if someone else has experienced this and was able to find a way to reattach the peeled off section with success, and what adhesive was used.

author: minifloat
author_rank: Contributor
timestamp: April 23, 2023, 09:24:55 pm
content: If you know someone able to 3D-print elastic materials, TPE or TPU, this might be a way to go.Otherwise, search online auction platforms for defect multimeters of the type you have, buy it, use the rubber and the rest goes into electronics recycling.br, mf
Fluke Philips PM3394 Combiscope AmpXZ IC - Page 1
Forum section: electronics / repair

author: Dalmo
author_rank: Newbie
timestamp: December 17, 2019, 11:14:04 pm
content: I got 2 PM3394 scopes, both with the AmpXZ busted: OQ0229PI can not find those anywhere, not even the datasheet.I want buy 4 of them, or at least 2.Please, can someone point me the right direction?Many thanks.

author: lunacyworks
author_rank: Contributor
timestamp: April 04, 2021, 07:47:36 am
content: What has happened to your scopes? I have a PM3394B that just came to me with the same fried chips. Wondering if you ever found any?

author: grumpydoc
author_rank: Super Contributor
timestamp: April 04, 2021, 12:19:33 pm
content: I'm pretty certain you're only going to find those in the 3394 and similar 'scopes.Look for a parts mule on eBay.

author: HighVoltage
author_rank: Super Contributor
timestamp: April 04, 2021, 01:12:34 pm
content: Philips made those chips only for these scopes and they are no where to be found.
Fluke Phillips PM6680 firmware - Page 1
Forum section: electronics / repair

author: kawal
author_rank: Frequent Contributor
timestamp: February 14, 2022, 06:22:57 am
content: I was troubleshooting a counter I recently acquired and as part of that I had removed all the socketed chips to clean and re seat the chips.That gave me the opportunity to save the firmware.BTW my issue was resolved by re seating the ASIC chip.Correction - that did not help the ASIC error after all. The unit needed a recapping as all the blue Phillips branded caps where significantly out of tolerance with high impedance.In circuit they measured ok but out of circuit they where bad. The ceramic caps probably where making the in circuit readings acceptable.The 33uf measured about 1...4 uf and 50 to 100Ohm330uf measured 50...100uf and 4..10 ohms and a few 10uf measured 3uf and 10ohm.After replacing all the caps no more issues with ASIC error on about 100 boot up sequences tested . Before the error would show up if the unit was in standby for more than 5s.SRAM battery was completely dead but that did not cause any issues other than resetting settings after power cycle. Original BR2032(200mAh) replaced with BR3032 (500mAh)as I had it from another project.
Fluke PM 3394A self calibration   - Page 1
Forum section: electronics / repair

author: Hellfish69
author_rank: Newbie
timestamp: December 26, 2021, 12:09:50 pm
content: Hello,i have scored a Fluke PM 3394A 200Mhz Scope. The Scope works fine. Self test ok analog mode works but in digital mode the scope has some issues.Channel 1 and 3 have a big offset. The self cal runs but is ends with a incomplete massage. What can i do to fix this problem with the offset?I removed the backup batteries (leaking) perhaps that causes the problem.Lg Mike

author: HighVoltage
author_rank: Super Contributor
timestamp: December 27, 2021, 03:31:45 pm
content: It has nothing to do with the backup batteries, they are only for RTC and memory of stored pictures and setupsYour problem is a hybrid chip that was originally manufactured by Philips and is now unobtanium.The 4 Channel scopes have two of these chips, one for CH1,CH3 and the other one for CH2,CH4
Fluke PM2811 Feet - Page 1
Forum section: electronics / repair

author: mfeinstein
author_rank: Contributor
timestamp: March 04, 2025, 12:08:25 pm
content: Hi, I bought a Fluke PM2811 and it came with the feet missing.Does anyone know:1. Where I could buy the feet? I tried ebay, but I can't find it.2. Does anyone have the feet and could send me good pictures so I could 3D print them?Thanks!

author: picburner
author_rank: Frequent Contributor
timestamp: March 05, 2025, 05:28:11 am
content: You can get a vague idea of ​​how the feet are made by watchingfrom minute 2:40 onwards.The video is of a PM2812 but the feet, according to the manual, should be the same (they are also different between the front and rear feet).

author: srb1954
author_rank: Super Contributor
timestamp: March 07, 2025, 08:45:51 am
content: Pictures attached.The rear foot is very basic and could be easily replicated as long as the spacing between the mounting screw hole and the locating peg hole are correct.The tilting front foot is more complicated as it has an internal plastic flexure element to hold the foot in the upright position. Alternatively, you could forgo the tilting feature and use the rear foot on the front as well.
FLUKE PM3082 on power up it blows its fuse....  - Page 1
Forum section: electronics / repair

author: The_Spectrum.A_idiot
author_rank: Regular Contributor
timestamp: February 06, 2020, 06:14:15 pm
content: Dear All ,I am aware of the other 2 postings regarding the FLUKE PM3082 , but nothing that could be helpful to my issue ,so after digging around found the service manual,I looked and located all Class Y(input caps) capacitors in case they wore cracked and replaced themand now I have no idea where to go next .... and I am quite afraid around high power CRT stuff because I've never worked with them ,so if anyone can help me how to diagnose the problem it would be nice.Last information the oscilloscope was on and working prior to just burning the fuse 1 day while being idleI hope someone can help me ,Thank you in advanceThe_Spectrum.A_idiot

author: goaty
author_rank: Regular Contributor
timestamp: February 07, 2020, 09:16:20 am
content: https://elektrotanya.com/fluke_pm3082_pm3084_pm3092_pm3094_2x2mv,100,200mhz_oscillosope_1997_sm.pdf/download.htmlPage 357 Chapter 5.6.5Check all parts in input and converter.Especially V1016, V1019Caps C1008 and C1009Maby optocoupler H1048