hybridfree/eevblog-posts huggingface dataset:
Fluke 196C repair (or yes, NiMHs do leak) - Page 1
Forum section: electronics / repair

author: simingx
author_rank: Contributor
timestamp: March 06, 2022, 10:39:12 am
content: Picked up a non working Fluke 196C, thinking it would be a reasonably easy repair. Boy was I wrong… the internal NiMH had spilled its guts all over the PCB.

author: simingx
author_rank: Contributor
timestamp: March 06, 2022, 10:42:16 am
content: Desoldered all the suspect-looking components and jumpered the obviously-broken connections. Let’s hope the battery acid (alkali?) didn’t make its way into the internal layers…

author: simingx
author_rank: Contributor
timestamp: March 06, 2022, 10:45:30 am
content: Bought a few new components to replace the shot ones, but ordered a wrong package for one of them (SOT23-6 instead of SC70). Back in the old one goes. Thankfully it wasn’t really affected by the leak.

author: simingx
author_rank: Contributor
timestamp: March 06, 2022, 10:47:36 am
content: A few probes to verify voltages and clocks later, and it powers up! It still won’t power up from battery (the VBAT input to the 74HC4051 multiplexer is way low, maybe there’s still some acid residue below it, will have to suck the chip off and see). Also the trace jumps around after a few minutes, maybe it’s the fan which I didn’t plug back in yet…
Fluke 199 display fault - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: August 11, 2025, 02:02:48 am
content: I've just bought a Fluke 199 (mono) from eBay.The display shows an artefact:I don't think this a problem with the zebra-strip(s), but an actual fault with the LCD.Any thoughts appreciated.Many thanks, David

author: Uunoctium
author_rank: Frequent Contributor
timestamp: August 11, 2025, 04:07:38 pm
content: Does the yellowish spot disappear after a certain period of operation, e.g. 10 minutes?

author: perdrix
author_rank: Frequent Contributor
timestamp: August 11, 2025, 06:56:55 pm
content: I don't believe so (I haven't received it yet).

author: Uunoctium
author_rank: Frequent Contributor
timestamp: August 11, 2025, 08:07:54 pm
content: If it does, that could be the beginning of an continuing progression of an disease, often seen on early b/w panels eg used in Tek's TDS2x0 series.The final stage than looks like the picture below.

author: mahi
author_rank: Regular Contributor
timestamp: August 12, 2025, 03:07:48 pm
content: I don't know what it is, but I've seen yellow spots and fractal-like patterns on Fluke 12x and 19x ScopeMeters before. Even here on the forum. See for example the pictures inRepair for Fluke 123, 124, 125 Scopemeter LCD Display .. what ?Although different in color, the pattern looks very similar toWeird squiggle on 20x4 LCDandWhy I do not like fractals on my LCD...Sadly no one seems to know what exactly it is, what is causing it or how to prevent it. One thing is for sure; once it's there, it's not going away and may get worse.

author: Runco990
author_rank: Frequent Contributor
timestamp: August 13, 2025, 12:00:20 am
content: As far as I know, this is NOT polarizer failure, but LCD "rot". It's UN-repairable.

author: perdrix
author_rank: Frequent Contributor
timestamp: August 15, 2025, 11:01:19 am
content: Has anyone identified a plausible candidate for replacing this?Or (failing that) has anyone got a dead 199 with a working display they would consider parting out?ThanksDavid

author: perdrix
author_rank: Frequent Contributor
timestamp: August 16, 2025, 10:00:03 am
content: A follow up: When I received it the yellow rot of death was much bigger and in addition there were two horizontal black lines (I guess zebra strip?).I informed the vendor - let's see how much he's prepared to refund ...Did anyone ever dis-assemble the display to ID the actual LCD used?David

author: perdrix
author_rank: Frequent Contributor
timestamp: August 16, 2025, 02:29:06 pm
content: It was returned to the vendor.
FLUKE 199 SCOPEMETER - Page 1
Forum section: electronics / repair

author: Oversea
author_rank: Newbie
timestamp: January 30, 2025, 03:27:55 pm
content: hIMY SCOPEMETER IS OUT OF ORDER IN MODE VAC ONLY (FUNCTION MULTIMETER)

author: BILLPOD
author_rank: Frequent Contributor
timestamp: January 31, 2025, 02:38:29 pm
content: Good Morning Oversee, Fluke has a service manual available to download. It is in PDF format, (I tried to attach it here, but was unsuccessful. Just enter:fluke 199 scopemeter manualinto your search engine, (I used Google).Don't forget to come back here and post what your experience is, {successful or not}.
Fluke 199C no scope traces - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: November 01, 2023, 11:04:09 am
content: I'm looking at a 199C on eBay that at the very least has no traces displayed in 'scope mode. I'm not clear it if still works as a multimeter.Is this typically a fixable issue, and if so what should I be looking at?Thanks, David

author: asis
author_rank: Frequent Contributor
timestamp: November 01, 2023, 09:35:13 pm
content: Hi,First of all, before purchasing, you need to determine the availability of the battery and power adapter Fluke BC190.If the scope has not been used for a long time, then the battery may have been deeply discharged (7.2V) or completely degraded.You will need to purchase it separately.In addition, the scope may not have an A201 memory module (Flash/SRAM).If the A201 is lost or it is installed from another scope, it is possible that the calibration constants have been changed and the accuracy of the readings is not guaranteed.The technical condition of the scope can only be determined by the reaction to its activation and by sound signals.In any case, it's a lottery.You can find some answers to your questions using the following links:https://www.eevblog.com/forum/repair/fluke-199c-power-on-issues/https://www.eevblog.com/forum/repair/fluke-scopemeter-199-no-channel-a-trace/https://www.eevblog.com/forum/repair/fluke-199c-scopemeter-repair/

author: perdrix
author_rank: Frequent Contributor
timestamp: November 04, 2023, 09:19:18 am
content: Hmmm... That sounds awfully like the OQ0260 ASICs have been damaged. If that's the case I don't think I'll go there unless someone knows where to get them (apart from ripping them out of another 199C).ThanksDavid

author: asis
author_rank: Frequent Contributor
timestamp: November 04, 2023, 01:03:40 pm
content: Don't get excited...What is the reaction (level of sound signals) when you turn on the scope?-Check all power supplies first and study the circuit diagram (SM).If possible, heat the chips using a good flux and a hot-air station with bottom heating.If you have the skill, start with channel A.
Fluke 199C Scopemeter a  non starter - Page 1
Forum section: electronics / repair

author: paf123
author_rank: Newbie
timestamp: April 14, 2024, 07:55:19 am
content: "Hugoneus" thanks for the heads up. I have a 199c with no boot issue. I ran the D-Asic mask memory test and all was ok. I then removed the memory module ran the tests again and it still passed go figure ?? I probed all the obvious critical stuff and all seemed ok but not knowing anything definitive about the D-asic mask software it was looking like the runtime software was failing i.e. not loading or corrupt. What to do I was about to embark on "feedback.loops" memory card development, programming path and then stumbled across your post re the D-ASIC balling often failing so I put a bit of pressure with my finger on it hit the on button and bingo everything works. Now how to permanently fix it is the next problem.cheers

author: xiaotaozi
author_rank: Newbie
timestamp: July 22, 2024, 01:33:06 am
content: I made a dual flash module to see if there are any needed
Fluke 199C “The instrument needs calibration....” - Page 1
Forum section: electronics / repair

author: syau
author_rank: Frequent Contributor
timestamp: August 01, 2019, 10:31:11 am
content: Just scored a Fluke 199C which display “The instrument needs calibration. Please contact your service center. ” Is there a way to reset this message without a full calibration ?

author: Black Phoenix
author_rank: Super Contributor
timestamp: August 01, 2019, 01:41:32 pm
content: That's probably because someone update to the latest firmware. I remember in the old Fluke Forums that there was a warning:QuoteGoing backwards is not possible too, because the calibration was lost already.Try this from the service manual (Fluke 192B/196B-C/199B-C Service Manual 5-18) -http://assets.fluke.com/manuals/192B____smeng0100.pdf

author: syau
author_rank: Frequent Contributor
timestamp: August 01, 2019, 11:13:35 pm
content: Quote from: Black Phoenix on August 01, 2019, 01:41:32 pmHooked up with signal generator and voltage source found those readings are within range (looks like the calibration data still valid)Followed the manual, it didn’t reset the warning. Looks like the previous own did saved the precal data instead of just turning it off.Doing a full calibration is not feasible as I don’t have the required square wave source.
Fluke 199C with only one channel working - Page 1
Forum section: electronics / repair

author: perdrix
author_rank: Frequent Contributor
timestamp: February 07, 2025, 11:50:21 am
content: I'm considering the purchase of a Fluke 199C with one dead 'scope channel.Would the primary suspect be the Display ASIC (D-Asic) for the dead channel?Is this repairable? Are the parts available (and if so, at what cost)?

author: squadchannel
author_rank: Frequent Contributor
timestamp: February 07, 2025, 12:03:12 pm
content: It's probably the C-ASIC on that channel that is damaged; the D-ASIC is the main microcontroller, and if it were damaged it wouldn't work at all.C-ASIC is a Philips OQ0260, $375 on ebay.also used in the 190II and THS3000.The question is whether the trace is displayed but does not respond at signal input, or whether the trace does not even appear. ?I am wondering what the status is when the C-ASIC is damaged. I do not know.Other possibilities: a damaged isolator between C-ASIC and D-ASIC, or a damaged front end. hmmm...

author: perdrix
author_rank: Frequent Contributor
timestamp: February 07, 2025, 02:34:01 pm
content: AFAIK no trace at all for that channel
Fluke 199C - Page 1
Forum section: electronics / repair

author: duffejo88
author_rank: Newbie
timestamp: February 23, 2025, 01:38:32 am
content: I am curious, I just bought a 199C and it seems to have issues.. when testing continuity without using probes it acts like there is a connection. Also while on the Resistance, with no probes attached it’s going from OL to ~25Mohms to 500kohms.. just random numbers. Volts AC should read 120v on outlet, but it’s reading ~80v.Any ideas?

author: djsb
author_rank: Super Contributor
timestamp: February 23, 2025, 03:59:23 pm
content: I have one of these. My first thought has it been near any water or has it gone from a very cold to a warmer environment (condensation)? What happens when you use it with probes? Are the connectors on the probes or the probe sockets damaged, or is there corrosion on them? Are these readings intermittent? Is the scope functionality OK and the problems only on the multimeter? Has it any signs of having been dropped? Any rattles when you shake it?Do ALL the controls work? Can you open it up to check on it internally?

author: duffejo88
author_rank: Newbie
timestamp: February 23, 2025, 10:41:26 pm
content: Quote from: djsb on February 23, 2025, 03:59:23 pmYea I don’t see water damage, even internally all looks clean. Using the probes it does have at least voltage readings. I don’t have anything to check resistances or diodes. The sockets look fine. The readings never stop fluctuating this “ghosts” values. I validated the scope this morning with a function generator, all good voltage and frequency. All functions/buttons work.
FLuke 23 / 77 Series II  U1 chip 683052 wanted...new or used - Page 1
Forum section: electronics / repair

author: charlyd
author_rank: Frequent Contributor
timestamp: March 21, 2016, 10:27:29 pm
content: hello i am looking for a chip from a fluke 77 Series II or a Fluke 23 Series II has the same U1 -> 8075 A/D chipFluke 77 Series II U1fluke stock number #683052mfrs number #89536if you have the old fluke 77 Broken or for parts please contact me with a PM.chip is located below 9 Volt battery.

author: Buzz
author_rank: Newbie
timestamp: March 10, 2021, 09:19:10 am
content: Still looking for one?$80AUD
Fluke 23 with blown R1 (fusible 1K, 2W) and R2 (1M, 1W 5%) - Page 1
Forum section: electronics / repair

author: Caladan
author_rank: Newbie
timestamp: July 25, 2024, 06:32:40 pm
content: I have a Fluke 23 with blown R1 and R2 resistors. Both measures OL. Everything else seems fine.Need help finding replacement part numbers.R1 is a fusible 1K, 2W and R2 is a 1M, 1W 5% resistor.Thanks!

author: Paceguy
author_rank: Regular Contributor
timestamp: July 25, 2024, 09:33:21 pm
content: These parts are no longer available thru Fluke. Best to purchase a parted out 23, 73, 75 or 77 and harvest the parts there.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 26, 2024, 12:51:44 am
content: there was some talk therehttps://www.eevblog.com/forum/testgear/fluke-77-replacement-for-r1-(1k-2w-fusible-resistor)/

author: Caladan
author_rank: Newbie
timestamp: October 15, 2024, 11:57:04 am
content: Hi again, what do we think of using these components as replacement parts?Fuse:https://no.mouser.com/ProductDetail/576-KLKD020.TR1 - Wirewound Resistors - Through Hole 2W 1000 ohms 1%:https://no.mouser.com/ProductDetail/588-WHC1K0FETR2 - Thick Film Resistors - Through Hole 1M ohm 5% 1W High Voltage:https://no.mouser.com/ProductDetail/756-VRW68-1M0JI
Fluke 233 fail - Page 1
Forum section: electronics / repair

author: tleeuwen
author_rank: Newbie
timestamp: November 25, 2019, 02:24:31 pm
content: Hello, I have an Fluke 233 that doesn't work. All batteries have been replaced by new ones. When I turn the meter on, only the power indicator light up on the right side in Red. It doesnt blink, ik burns red all the time. I try to search for this error on the internet but can't find anything. Does anybody know what could be the problem?
FLUKE 233 LCD Shows Wrong Information  - Page 1
Forum section: electronics / repair

author: srmahaffy
author_rank: Contributor
timestamp: November 17, 2022, 08:06:53 pm
content: Hi,I recently purchased a nonworking fluke 233 in hopes to repair it. The issue I see seems to be the display unit as I have a spare motherboard PCB and installed that and I get the same symptom. Theproblem is the LCD shows incorrect symbols on (see pics), and when different modes are selected, multiple modes show enabled on the LCD screen. I probed the display PCB, and couldn’t find any issue so far, except I did discover an intermittent ground trace from the battery - terminal, which I corrected with a jumper wire. I know there are no schematics of this that I can find, but used a Fluke 87V schematic as a guide, as it uses the same M430F448 chip. Also, and this is my main question, after further investigation, I looked at the LCD, and found that there is a 1/4” chip out of the LCD glass which is an area that the zebra strip sits on. I also found a crack on the LCD glass on the opposite side of glass which is also an area where the zebra strip sits. Does anyone know if these issues with the LCD glass can cause symbols to be on when they shouldn’t be, or just incorrect LCD information? I don’t have knowledge with LCDs, my main background is electronics but not that expertise. Thank you for anyone that can provide info!

author: srmahaffy
author_rank: Contributor
timestamp: November 19, 2022, 09:24:06 pm
content: Hi,For anyone that might have a similar issue, replacing the LCD corrected my problem. Below is what the broken LCD looked like. I wonder if someone dropped the meter and that’s how it got broken, or if it was ever installed backwards? Who knows, I’m just glad it’s fixed!
Fluke 233 looking for schematic - Page 1
Forum section: electronics / repair

author: srmahaffy
author_rank: Contributor
timestamp: March 04, 2022, 12:13:23 am
content: Hi Everyone, I just bought a Fluke 233 on eBay for $50, that I’m waiting for and it needs repair. Does anyone know where, or have the schematics for this meter? I don’t see them in the Fluke website. Thanks in advance!!

author: papi
author_rank: Newbie
timestamp: June 13, 2024, 12:16:21 pm
content: Hi,I have the some problems with a Fluke 233, did you find the schematics and solved your problems.Thank you very much for your help.Andrea Papi
Fluke 27 LCD replacement. - Page 1
Forum section: electronics / repair

author: sidgallup
author_rank: Newbie
timestamp: November 20, 2021, 09:30:00 pm
content: I have an attachment to this DMM its the one i used when i was learning to solder and electronics repair, been sitting in a box for years because the LCD had a circle right in the middle of the screen where no digits could be seen. So i was trying to fix it by removing the polarizing film from the back of the LCD but i guess the razor i used was just too sharp and ended up destroying bot layers, the reflective and also the plastic polarizing film in one go.Now my options are either buying replacements for both films, or a completely working LCD. Does anyone heere know where to order either of those? or maybe someone can sell me an already working LCD so i can just drop it in and go. Im located in Houston Texas.
FLUKE 287 CAL - Page 1
Forum section: electronics / repair

author: lzcubchgg
author_rank: Contributor
timestamp: January 19, 2025, 12:25:21 pm
content: I have a FLUKE 287 that prompts for calibration when it is turned on. I don't have an official warranty, I want to know if there is a problem with the data in the flash memory. I want to use data from another good machine to refresh it. Can I handle it this way? thank you.calibration data invalid,calibrate meter before use.see service manual.

author: lzcubchgg
author_rank: Contributor
timestamp: January 19, 2025, 12:28:40 pm
content: 287 cal jpg

author: coromonadalix
author_rank: Super Contributor
timestamp: January 20, 2025, 12:33:27 am
content: maybe some pointers herehttps://www.eevblog.com/forum/repair/fluke-289-woes/msg1892444/#msg1892444

author: lzcubchgg
author_rank: Contributor
timestamp: January 20, 2025, 04:42:48 am
content: Thank you, I am already watching.
fluke 287 green led flashing - Page 1
Forum section: electronics / repair

author: Gil31
author_rank: Newbie
timestamp: August 27, 2024, 08:14:37 am
content: Hi everyone,Here is my problem, I had the bad idea of ​​wanting to power my fluke with a 9v transformer, but there was 12v at the output!The fluke turned on and off.I put the battery back in to check if it turned on, but the green LED on the switch flashes and the fluke does not turn on anymore!I started investigating, and I found a short circuit on the diode CR9, and the capacitors C79 and C67.The 9v voltage arrives on Q20/Q21 but not further, maybe a problem with U20?Thanks for your help.RegardsGil

author: coromonadalix
author_rank: Super Contributor
timestamp: August 28, 2024, 05:54:15 am
content: refer to this thread you may get some helphttps://www.eevblog.com/forum/testgear/fluke-189iian-(289)-service-manual/msg4745819/#msg4745819

author: Gil31
author_rank: Newbie
timestamp: August 29, 2024, 06:57:22 am
content: Thanks a lot !!
FLUKE 287 no temperature compensation - Page 1
Forum section: electronics / repair

author: Neonphoenix
author_rank: Newbie
timestamp: November 23, 2021, 11:40:23 pm
content: I have a used FLUKE 287 I picked up to use with temperature calibrations. The problem I am having is when I'm outside in the cold the temperature reads higher than it should and when inside a hot building it reads lower than it should. I'll put my thermocouple in an ice bath and warm up the FLUKE on my dash abs watch the temperature drop. It's like it is not compensating for the internal temperature of the mainboard. Any idea where to look to fix this? Schematics perhaps? Thanks

author: Neonphoenix
author_rank: Newbie
timestamp: November 26, 2021, 03:04:59 am
content: Inside temp about 10°C with thermocouple in an ice bathOutside temp about 0°C with thermocouple in an ice bath

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 26, 2021, 08:21:17 am
content: You can check the internal temp sensor by using a short bar at the input jacks.Display should show DMM's internal temperature.Check at room temparature, cold device (outside your home) and warm device (room heating, hair dryer...).

author: Neonphoenix
author_rank: Newbie
timestamp: November 27, 2021, 04:02:50 am
content: That is a fantastic bit of information. Thank you. I did check it: grabbed it from the cold truck it read about 4°C. After leaving it to acclimate to the room temperature, it read about 16°C then again about 22. Using the hair dryer it slowly climbed to 28. I put it back outside and checked it in 5 mins and it was reading 30+. Checked in another 5 and, although cold to the touch, it read 26 and slowly falling. Sitting on the desk for a couple mins and it is 22. It seems like the thermal sensor is working but very slowly. Testing it against a new 725 there is no comparison as to performance. Could the thermal sensor be getting weak or failing in some manner? Do you know the part number if I were to replace it? Thanks again. Very helpful.

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 27, 2021, 12:04:35 pm
content: Of course a temp sensor could fail. Is it just following very slowly the real temp or is it "jumping around"?I'd give it an hour to acclimate.And no, I don't know the part no of the temp sensor.Have you asked Fluke?

author: Neonphoenix
author_rank: Newbie
timestamp: November 28, 2021, 05:49:21 pm
content: The temperature seems to be accurate but following very slowly. The 725 I've used didn't seem to have this issue. I go from outside to a hot compressor building back to outside. Always changing environments. If I have to wait 30+ mins for my fluke to acclimate, my productivity will go out the window. I'll see if FLUKE will give me the part number but I'm not holding my breath. Thanks again.

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 30, 2021, 10:05:24 pm
content: Quote from: Neonphoenix on November 28, 2021, 05:49:21 pmI think 30 to 60 minutes to acclimate is normal.All conductors of the instruments (not only the internal temp sensor) need to come to environment temperature.
fluke 287 repair - Page 1
Forum section: electronics / repair

author: lern01
author_rank: Regular Contributor
timestamp: November 25, 2024, 12:15:58 pm
content: A Fluke 287 was powered by a maintenance power supply. After the logo appeared when it was turned on, the current suddenly increased to about 200mA, and the screen went black (probably because the 287 automatically shut down for protection). The case was opened, and the voltages of each line were checked. There was no 5V voltage. The 5V power supply terminal of the 287 was checked with the diode range of a digital multimeter when the power was turned off, and a short circuit to the ground was found. The machine was baked using an external power supply of 2V and an overcurrent protection setting of about 800mA. When it was added to the 5V terminal of the 287, U9 immediately became hot and a little hot to the touch. The IC was removed and the power pin and the ground pin were short-circuited. After replacement, the machine started up normally. The machine was perfectly repaired.
FLUKE 287 unmeasurable repair  - Page 1
Forum section: electronics / repair

author: lzcubchgg
author_rank: Contributor
timestamp: September 24, 2025, 02:27:19 pm
content: I have a FLUKE 287 that, when powered on, displays a line on the screen indicating all gears. I have measured all the voltages and they are normal. I have replaced the SL10327 and it has not changed. Is there anything else that needs to be checked? Thank you.

author: lzcubchgg
author_rank: Contributor
timestamp: September 25, 2025, 02:47:16 pm
content: 430 bad .....

author: CapLeaker
author_rank: Regular Contributor
timestamp: September 27, 2025, 07:01:21 pm
content: Check around the super capacitor. If the super capacitor is shorted out to nearby resistors or other components it will display - - - - (4 dashes). I’ve got a thread in Badcaps about my Fluke 289 ventures.
Fluke 289 do not measure resistance - Page 1
Forum section: electronics / repair

author: regged
author_rank: Newbie
timestamp: April 17, 2021, 06:14:35 pm
content: Hi all. Is there any schematics to understand how resistance measure works? Everything works except ohms, lo 50ohm also work. But when i choose ohms, DMM shows 150Kom all time. When i short leads, it shows 2.3 Ohms.

author: retiredcaps
author_rank: Super Contributor
timestamp: April 17, 2021, 07:00:00 pm
content: I suggest checking all the input protection like the PTC, MOVs, fusible resistor, etc. The PTC should be around 1K ohm, the MOV's should be open circuit and fusible resistor around 1K ohm.Also, if your 289 had battery leakage, it would be a good idea to clean the entire PCB with 99% IPA.

author: Grandchuck
author_rank: Super Contributor
timestamp: April 17, 2021, 07:01:47 pm
content: Also, there might be a pair of transistors serving as a voltage clamp (Zener) which could be damaged.

author: Trader
author_rank: Frequent Contributor
timestamp: April 17, 2021, 09:52:12 pm
content: A Fluke 289 has a lifetime warranty, did you check this?

author: regged
author_rank: Newbie
timestamp: April 18, 2021, 06:57:55 am
content: Can you show which thermistors and varistors? I found one green ptc with R112 marking. This probably exploded.

author: regged
author_rank: Newbie
timestamp: April 18, 2021, 12:38:15 pm
content: I checked between com and V leads, there is ~150Kom and this resistance always shows on display.

author: retiredcaps
author_rank: Super Contributor
timestamp: April 18, 2021, 06:33:57 pm
content: Quote from: regged on April 18, 2021, 06:57:55 amPost clear focused pictures of the PCB so we can see what you are talking about.

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 22, 2021, 08:26:32 pm
content: Why don't you simply send it back to Fluke for repair. It should be free.

author: Elliotsk
author_rank: Newbie
timestamp: April 24, 2021, 01:15:15 am
content: I had the same problem ALSO the audible continuity worked intermittently as well. HERE is the fix that worked perfectly. For some reason the test leads on new Flukes have had some kind of coating on the outside that screws up the resistance and continuity tests. Take a small patch of scotch-brite or very very fine sandpaper and clean the probe tips tip to base. BAM! Problems solved for me! Fingers crossed for you!
Fluke 289 LCD contrast - Page 1
Forum section: electronics / repair

author: rporonga
author_rank: Newbie
timestamp: January 21, 2023, 10:43:29 am
content: It appears that all Fluke 289 manufactured after April 2022 come with an issue with the LCD contrast which requires setting it to max brightness to get a clearer display, otherwise the contrast is low and the whole LCD is very dark. I wanted to check if this is true by getting feedback here from other users, and also check if anybody knows how to shift the contrast to the lighter side so that the screen is readable in the middle of the range.Here is some context. I sent my Fluke 289 for service in 2017 due to the super capacitor issue. They replaced the super capacitor under warranty, and it failed again in 2022. I sent it in for service and this second time they replaced the main board which uses a battery instead of a super capacitor. When I got it back I noticed the screen being very dark and needing to jack up the brightness to make it look like it used to. So I sent it in again, and this time they sent me a new unit, which still has the contrast issue. The Fluke technician acknowledged in the service notes the problem with the contrast of all units after April 2022, further stating that their engineering department has not yet provided any solution.

author: rporonga
author_rank: Newbie
timestamp: April 14, 2023, 05:27:50 am
content: Following up on my previous post, the LCD contrast issue was solved by Fluke service under warranty, and it required swapping components in the PCA. Hopefully this will be fixed from the factory in future board revisions.
Fluke 289 LCD has faded lines - Page 1
Forum section: electronics / repair

author: iuuang
author_rank: Newbie
timestamp: February 03, 2025, 09:16:09 pm
content: Hello EEVblog forum repair gods,I have been lurking for a long time and haven't had the necessity to create a account to post about problems with my test equipment because there always was a post that solved my issues already.Today is different, I haven't come across a post with this problem for the F289.The issue is that after replacing the internal 3V battery, the LCD decided to show some faded lines where there is not anything displayed. I have tried to disconnect and reconnect the LCD, clean the LCD connector and inspected the LCD module to see if there were some obvious flaws but there aren't. This leads me to believe that the problem my be in the LCD driver section. I have also tried with different main battery voltages but it doesn't make a difference and I would say that the fading is getting worse, I will attach some photos.I have also performed the complete lead detection system components swap as I bought this meter for 250€ second hand with that problem but after that repair was done there wasn't any flaws in the LCD, it was only after the internal battery swap (older board revisions seem to have a supercapacitor instead of the battery).Thank you for saving me some many times already,iuuang.

author: silly sausage
author_rank: Regular Contributor
timestamp: February 06, 2025, 12:04:47 am
content: bad/mucky zebra strips by the look of it?.

author: Ugur
author_rank: Regular Contributor
timestamp: February 06, 2025, 08:18:36 am
content: This one doesn't have zebra stripes. The LCD screen is connected to the board via a cable.It looks like a screen problem.Please note that this device is still under warranty.

author: coromonadalix
author_rank: Super Contributor
timestamp: February 06, 2025, 12:13:02 pm
content: under warranty no play in itsend it back
fluke 28ii part values - Page 1
Forum section: electronics / repair

author: lynnw
author_rank: Newbie
timestamp: March 10, 2024, 03:46:34 am
content: Anybody have part values for Fluke 28ii multi meter Thanks.

author: Ugur
author_rank: Regular Contributor
timestamp: March 11, 2024, 07:56:53 am
content: Which part are you questioning?
fluke 30 clamp on amp meter wiring from lead board (probe board) to main board  - Page 1
Forum section: electronics / repair

author: recountryman
author_rank: Newbie
timestamp: July 24, 2014, 11:42:11 pm
content: Hello. I have a fluke 30 that had the lead jack pulled from the board and managed to make another one (used guide from modemhead..thanks by the way) but to make it easier I removed the 3 wire (hot, ground and common...a red , black and green wire)I had pics where they go go but due to smart phone dying I lost the pics.Anyone have one they can post a pic of?or can tell by the pics included where they go? I'm pretty sure where the hot wire goes but other 2 I have a 50/50 chance of getting it right and I'd rather not blow even though got it on the cheap.I'm a mechanical guy but will cross over to the wild side every now and then !thanks!I circled with color where I "think" they go

author: recountryman
author_rank: Newbie
timestamp: July 26, 2014, 06:04:17 pm
content: Never mind I was correct and it now works great!

author: miguelvp
author_rank: Super Contributor
timestamp: July 26, 2014, 06:16:18 pm
content: I'm glad you figure it out, did search over the interwebs and I couldn't find a single image from the inside of the fluke 30.I guess no one in here owns one either.

author: recountryman
author_rank: Newbie
timestamp: July 26, 2014, 09:59:31 pm
content: lol..I spent hours on google trying to find a image with no luck.Figured well try it like I thought and just ohm something out with the leads ans see what happens. Works great for just about 22 dollars given for it.

author: retiredcaps
author_rank: Super Contributor
timestamp: July 26, 2014, 11:07:46 pm
content: Quote from: miguelvp on July 26, 2014, 06:16:18 pmSame here.

author: dardosordi
author_rank: Regular Contributor
timestamp: April 30, 2019, 05:30:37 am
content: Hi recountryman,I know this thread is very old but in the chance you or somebody else could post pictures of the wiring for the Fluke 32/32 on the main board.I have one of each with all wires cut at board level, and trying to repair.Thanks!
Fluke 323 AC Voltage Issue - Page 1
Forum section: electronics / repair

author: hhershberger
author_rank: Newbie
timestamp: July 04, 2020, 03:30:17 pm
content: Hello all,I have a used Fluke 323 clamp meter that is currently not reading AC Voltage correctly. I was wondering if anyone had any tips or thoughts on how to address the issue or what it could be caused by.Currently when you turn the dial to AC Voltage from the OFF position, the display reads OL, then drops over the span of about 5 seconds to hover between 0-2 V. Testing a standard house outlet from hot to ground results in an OL display on the screen instead of the expected 120V.It seems as though all other functionality on the meter works fine - Amp clamp, resistance, DC voltage all OK.Any ideas?Thanks in advance,HH
Fluke 332D DC Voltage Source - No output after capacitor replacement. - Page 1
Forum section: electronics / repair

author: TERRA Operative
author_rank: Super Contributor
timestamp: August 17, 2019, 07:31:10 am
content: I semi-recently acquired an old Fluke 332D DC Voltage Standard and as part of the restoration I replaced all the electrolytic capacitors.Now, I am unable to get any output from the unit. It was outputting voltage before but now it just trips out on over current or over voltage (It's not clear which one).I replaced all the caps like for like as best as I could, ie. replacing all the Sprague 30D caps with brand new 30D caps etc. and I've double checked values and orientation.Is there anyone who can point me in the right direction as to what to poke in this thing to make it work?

author: TERRA Operative
author_rank: Super Contributor
timestamp: August 18, 2019, 04:19:38 pm
content: Well, with a poke around I found a bunch of out of spec resistors in my unit and a busted Zener on the Aux PSU board. It's the precision CR6 6.3V one. I'll replace it with a standard zener for testing then swap to a 1N829A once it's working.I think I'll rip out the carbon composite resistors and replace them all with metal film resistors (I can get 1% tolerance, 50ppm for a good price).The resistance checks in the service manual at the start of the troubleshooting section indicate there is a problem with the Aux PSU board, so replacing these bits might just get it working..
fluke 3330B fault current output - Page 1
Forum section: electronics / repair

author: NRP_SANTOS
author_rank: Newbie
timestamp: December 07, 2021, 02:33:45 pm
content: Hello friends, I'm looking for help repairing my fluke 3330b.his problem is in currents above 3ma. Whichever scale is selected, it always maintains 6ma of output.Best regardsnrp_santos

author: alm
author_rank: Super Contributor
timestamp: December 08, 2021, 12:35:18 pm
content: Is it working below 3 mA? Does it jump right to 6 mA as soon as you set the current above 3 mA?I haven't studied the schematic, but sounds like it might be a bad transistor to me. Although I would also check all voltage rails for ripple (bad caps).Be aware there are lethal voltages inside, so be very careful operating it with the covers off.

author: NRP_SANTOS
author_rank: Newbie
timestamp: December 09, 2021, 09:44:58 am
content: hello Alm,I appreciate your availability.It works below 3ma.above the 3ma range it always maintains the 6ma output value.best regards,nrp_santos

author: Dr. Frank
author_rank: Super Contributor
timestamp: December 09, 2021, 03:37:37 pm
content: Hello,does this error occur only in constant current mode, or also in constant voltage mode?Frank

author: NRP_SANTOS
author_rank: Newbie
timestamp: December 10, 2021, 09:43:33 am
content: Hello Frank,The problem only occurs in current.When I select above 3ma.the signal measured oscilloscope the input and output of the PCBs (A4A2 chopper amp., A4A3 differecial amp., and A4A4 series pass drive) occurs a 100hz oscillation.NRP_SANTOS
FLUKE 336 Repair - Page 1
Forum section: electronics / repair

author: whitepawn
author_rank: Newbie
timestamp: March 02, 2025, 04:44:28 am
content: Recently i bought a fluke 336 for a reasonable price. Seller sold item as a faulty.It seems a battery is leaked into PCB and corroded some traces and one IC is missing with 5 legs. I searched all over internet but couldn't find service manual or any schematic. No PCB photos also. There (https://schneiderelectronicsrepair.nl/?p=597) is some but i couldn't read markings on IC.Battery compartment:Missing IC:(Next one is marked as "A4A" i assume its opamp)Does anyone have any info about it? A component marking will also helps.Thanks in advance.

author: benj38
author_rank: Frequent Contributor
timestamp: March 02, 2025, 11:38:59 pm
content: The following video is in 4K resolution, and there is a chance that if you extract the image at time 13:44 you may just be able to see the marking on the part. It is worth a try.

author: daisizhou
author_rank: Super Contributor
timestamp: March 03, 2025, 12:45:36 am
content: Quote from: whitepawn on March 02, 2025, 04:44:28 amIt looks like there is severe corrosion on the circuit board,Requires thorough cleaning (including underside of components).Some places need to be reconnected

author: Jimmy Electron
author_rank: Contributor
timestamp: March 03, 2025, 10:09:31 pm
content: I have a 334 which is from the same family.One day it just refused to turn on...Seemingly not such good qualityEnclosing the service manual for the 33x series belowThe following link shows a 337 board which uses A79A's in the mixhttps://www.eevblog.com/forum/repair/fluke-337-repair/Your best bet is someone who actually has one coming onto the forumGonna attach a pic of the 334 board...Also uses A00B's, an L00B and an L7A9B

author: TERRA Operative
author_rank: Super Contributor
timestamp: March 04, 2025, 12:34:50 am
content: I have a Fluke 337, which is practically identical except for a few extra functions.Here's a photo of the PCB.

author: Jimmy Electron
author_rank: Contributor
timestamp: March 04, 2025, 12:53:06 am
content: Well done.Seems most likely that he needs an A79A Op-amp

author: whitepawn
author_rank: Newbie
timestamp: March 04, 2025, 10:18:18 am
content: Many many thanks all for your input. Fluke 337 seems very similiar. I will change opamp and post results.
Fluke 337 - Page 1
Forum section: electronics / repair

author: artesdev
author_rank: Newbie
timestamp: December 20, 2023, 04:01:45 pm
content: Hi everyone.I'm new on this board. I have a Fluke 337 that was hit by an overload. I already find the Operational Amplifier (pic uncluded) but there is a resistor just below that has blow. Anyone can tell me the value of it ?For the pic :https://drive.google.com/file/d/1NXFVygjBxaTk3WUiGquy-iRvnu_QyCDY/view?usp=drive_linkThanks !

author: gamalot
author_rank: Super Contributor
timestamp: December 20, 2023, 04:28:35 pm
content: It is not a resistor but a ceramic capacitor (MLCC).

author: artesdev
author_rank: Newbie
timestamp: December 20, 2023, 05:49:42 pm
content: Wasn't sure about it. Thanks !
fluke 343a -15V power failure for help - Page 1
Forum section: electronics / repair

author: daisizhou
author_rank: Super Contributor
timestamp: December 11, 2020, 12:08:37 pm
content: A fluke 343a is being repaired and found that the -15V power supply has disappearedFound that Q21-SM 4144 transistor is damaged.This is a transistor made by Motorola.Can't buy nowI want to know what should I do? Is there a replacement modelThanks for help. thanks[ Specified attachment is not available ] [ Specified attachment is not available ]

author: wn1fju
author_rank: Frequent Contributor
timestamp: December 11, 2020, 04:58:08 pm
content: The -15V is an auxiliary supply whose components do not seem terribly crucial. The reference for the 343a, fortunately for you, is in the +15V supply. I would think you could get by with just about any medium power general purpose PNP transistor for Q21. Something like 50V C-E, a couple of hundred mA current and a 1 watt power dissipation.

author: daisizhou
author_rank: Super Contributor
timestamp: December 12, 2020, 01:54:04 am
content: Thanks for the successful repair
Fluke 343a Threat screws switches (hex standofs) - Page 1
Forum section: electronics / repair

author: pe2ben
author_rank: Contributor
timestamp: September 29, 2025, 04:57:28 pm
content: Hello,I have a problem with one of the rotary switches from my fluke 343a.Does someone knows the threat size from the long screws from the rotary switches (screws trough the plexiglass hex standoffs)? It looks like it is not metric. Thanks Ben

author: coromonadalix
author_rank: Super Contributor
timestamp: September 29, 2025, 05:48:18 pm
content: mmm can't recall if they where or are 4-40 ??

author: pe2ben
author_rank: Contributor
timestamp: September 29, 2025, 08:58:31 pm
content: Thanks, looks okay (converted 4-40 to mm) . i have ordered some.
Fluke 343A Voltage Calibrator repair oscillating output  - Page 1
Forum section: electronics / repair

author: sahko123
author_rank: Frequent Contributor
timestamp: February 27, 2023, 01:36:35 am
content: Ive gotten a 343a recently and when i got it initially it was supposed to be unstable but actually ran quite steady for quite a while until recently when it started to oscillate very very badly. It at about 500-600mHz (not MHz) with swings of about 8-12vdc for a 10V setting. This oscillation carries on through most if not all ranges. I suspect something dodgy has happened to the chopper amp and im thinking of following the xdevs upgrade path shown off here (https://xdevs.com/doc/Fluke/343A/) and replacing the main amp with something more stable and less finicky.Also i need to find a way to stop it building up as much common mode voltage (order of kv) without having to have the output ground earthed at all times. I get annoying zaps from it otherwise.Does anybody have any advice on what exactly the issue could be for both the dick-swinging voltage and the high voltage buildup.? cause i want to get it working before modernising anything.

author: TizianoHV
author_rank: Regular Contributor
timestamp: February 27, 2023, 10:18:15 am
content: Stupid question, did you checked the caps?He ->() has repaired a few of these and bad caps were often responsible.Try reversing the mains plug and see if you still get shocked.

author: sahko123
author_rank: Frequent Contributor
timestamp: February 27, 2023, 07:59:43 pm
content: I tested a good few of the capacitors on the power supply and they were all good so can be put at the end of the queue for the full recap. This video pointed me in EXACTLY the right direction C42 being a 5uF 25Vdc now is a 250pF capacitor.after replacing two caps and now the thing is rock solid.Why would swapping mains wiring do anything? I'm on 3 pin uk plugs so the exterior is earthed I tend to get zapped by the outputs if they arent earthed

author: TizianoHV
author_rank: Regular Contributor
timestamp: February 27, 2023, 09:38:05 pm
content: Nice to hear!Here in Italy mains plug aren't polarized so you can "swamp" phase and neutral. There cold be a leaky interference capacitor causing leak from mains phase to output. By swamping phases the leaky cap would see only a neutral to ground (few volts) instead of phase to ground voltage (220?).*I asked you to reverse the plug because, at first, I thought you were italian (similar flag...).
FLUKE 345 - schematic or service manual available? - Page 1
Forum section: electronics / repair

author: mslr
author_rank: Contributor
timestamp: May 03, 2022, 02:54:53 pm
content: Dear all,got a dead Fluke 345 power quality clamp meter on my bench not working. Highly damaged by leaking batteries in the lower part of the PCB where analog front end and power supply is located. Some traces are eaten up and missing. Has anybody a schematic to check missing connections? Since this is a multylayer board and I do not have XRay available it is not straight forward.... I'm most worry about the vias some of them show quite nice blue flowers growing out of them...Anybody out who could help? It is a quite expensive piece of stuff worth spending some time to get it back to live.

author: strawberry
author_rank: Super Contributor
timestamp: May 03, 2022, 04:47:39 pm
content: no schematics available for shoremicroscope... hard worksome chemical that takes/converts only copper oxide and then add fresh plating

author: mslr
author_rank: Contributor
timestamp: May 04, 2022, 12:33:45 pm
content: Can anybody provide me with a photo of the PCB (both sides)? Would be better than nothing.

author: firebladecbr1k
author_rank: Newbie
timestamp: March 18, 2024, 08:23:24 am
content: I have the same exact issue. Battery leak, massive corrosion to lower part of PCB.And some parts missing as someone before me has had a go at repairing it.How did you go with getting pics or schematics?
Fluke 37 Zebra Strips - Page 1
Forum section: electronics / repair

author: daveyk
author_rank: Frequent Contributor
timestamp: April 20, 2022, 03:24:59 pm
content: Does anyone know of a source of Zebra strips that would work in a Fluke 87? I had mine apart a few weeks ago cleaning them and once back together was great. A few weeks later and the right most digit right size is fading out again.I can find the ones for the 80 series on EBAY and some generic strips, but have no idea what the old 37 needs.

author: Excavatoree
author_rank: Frequent Contributor
timestamp: April 20, 2022, 05:36:24 pm
content: The strips from a 27 may work. (8025a, 8025b, 25, and 27) It's been a while since I've had my 37 apart, so I may be remembering incorrectly.If they are the same, the 27 strips will be easier to find. (p/n is 682500) I did find one Ebay seller offering these.https://www.ebay.com/itm/392308458376