FLUKE 289, shows message "warning leads connected incorrectly", I have detected  - Page 1
Forum section: electronics / repair

author: EDER
author_rank: Contributor
timestamp: March 30, 2019, 11:57:54 pm
content: I have a FLUKE 289, shows message "warning leads connected incorrectly", I have detected that it is by the device O27, please I will appreciate if you can indicate which is the device code to replace it.Thank you

author: mr.fabe
author_rank: Regular Contributor
timestamp: March 31, 2019, 12:37:59 am
content: Just wondering.. are you sure it's not DS2 that could be the issue? Some folks with the same type of warning have traced their issue to the DS2 diode to fix their problem.https://www.eevblog.com/forum/beginners/my-fluke-289-displays-_warning-leads-connected-incorrectly_-after-the-case-open/msg735239/#msg735239

author: EDER
author_rank: Contributor
timestamp: March 31, 2019, 12:59:07 am
content: Thank you for your attention mr.fabe.I commented, before exchanging the O27 and O24 devices on the screen showed a value in the scale of microamps, then when exchanging O24 to O27 the value is shown in the ampere / milliampere scale (as in the image), it is which makes me suppose that it is not the DS2 device that is damaged. How could I leave the doubt that value should measure me when testing the DS2 in reverse and direct?

author: floobydust
author_rank: Super Contributor
timestamp: March 31, 2019, 04:16:45 am
content: See:https://www.eevblog.com/forum/repair/fluke-289-woes/msg1896530/#msg1896530Q24 & Q27 = OSRAM SFH325 FA-3/4-Z - NPN Phototransistor in SMT SIDELED®-Package PLCC-2 980nm 60°. Range 920-1,025nm at -10%. SFH 325 FA-3 worked too.DS02 (F287) = SMT IR LED 0805 (exact type unknown atm) orion242 found this to work: Kingbright KP-APT2012F3C IR LED emitter 940nm 120° 0805 (metric 2012) Digi-Key 754-1435-1-ND."The Diode DS2 is an infrared {LED} diode. Replacement with an SMD 0805 sized IR diode with 940nm wavelength seems to work just fine. In my case a Harvatek HT-170IRAJ was used. Just be careful that the height of the led is not to great, otherwise the diffusor in the multimeter case will crush your led when the case is reassembled"fromhttps://www.eevblog.com/forum/reviews/fluke-287-input-alert-diode-type-replacement/https://www.eevblog.com/forum/beginners/my-fluke-289-displays-_warning-leads-connected-incorrectly_-after-the-case-open/edit: added a thread, and IR LED p/n.

author: EDER
author_rank: Contributor
timestamp: March 31, 2019, 04:32:26 am
content: Thank you for yourfloobydustattention.It will make the purchase of the devices and then, I will be publishing the results of the repair.Best regards.

author: PoorConduct
author_rank: Newbie
timestamp: January 31, 2020, 09:53:38 am
content: I found this thread helpful in fixing my meter, so I thought that I would add some useful information that I found. I have also created a short video here:In my case the LED was not emitting any IR although it had the correct forward voltage drop for a 10mA current.I used an old digital camera to look for IR coming out of the diode when I powered it from a 10mA current-limited bench PSU. Note that many newer cameras, including phones have an IR filter and you cannot detect IR.I identified that IR LED as:Kingbright KP-2012F3C INFRARED EMITTER, 940 NM, 0805I bought a pack of 5 from Farnell (2290432) for less than £1.Be aware that the LED needs to be soldered flat to the PCB so that it fits correctly into the light guide in the front of the case. Also note that the probe lead detection only works with the PCB fitted fully into the case front sol that it aligns with the light guide and the small holes in the sockets.

author: justincr83
author_rank: Newbie
timestamp: January 26, 2021, 07:24:52 pm
content: Well... it happened to me also... 6 months ago was the first sign of this fault. I took the fluke apart and cleaned the phototransistors... it solved my problem then.Now it didn’t work. So i ordered mew diodes and transistors.It’s stuck on 400ma plug, if i turn the knom on A/ma the warning disappears without having the probe plugged in.The strangest part is the following:If i use the flashlight from my phone and put it very close to the “hole” where u plug in the proble for 400ma range, the warning message disappears.I think is a transistor fault in my case...We’ll post the results after i get the parts.

author: justincr83
author_rank: Newbie
timestamp: January 29, 2021, 09:18:30 pm
content: The next day, was a little sunny and i turned on my multimeter, it worked without any problem, no warning messages... i turned on my phone flashlight and placed in front of the multimeter A/uA jacks. After i removed the light problem appeard again. So i set it aside and wait for the parts to arrive.Today i got the parts tranzistors and ir led, so inreplaced the ir led because i had doubts about it, judging the flashlight and sun behavior.Now it’s working again even it’s dark inside my lab.Good luck in fixing your fluke, to all of you facing this problem(s)!

author: orion242
author_rank: Unknown
timestamp: July 23, 2022, 02:22:47 am
content: DS2 broke lose on a second 289 of mine now. At this point if your using your 189/289 in the field, aka banging around, rare drops from 10' ladder (or more $hit happens), etc, that LED seems to be a pain point. The damn thing is a door stop if this detection fails.Couldn't source the LED from the video above in a reasonable time frame / hassle. Digikey part # 754-1435-1, manufacture part # APT2012F3C seems to work. This guy is my daily driver so if that fails, I'll report back.This LED and the lead detection problem really seems like a poor design unless its bench princess. The meter is totally useless if the lead detection fails. How the hell this 0805 led breaks loose before something like the IR detectors that is beyond me. Love the meter, but its not as robust as other Flukes I have had. Sadly, I love it...and will keep replacing with 189s. Least until I must bow to the safety nuts and piss around with wireless measurement.

author: sstepane
author_rank: Regular Contributor
timestamp: September 10, 2024, 11:16:48 am
content: Hi,Just replaced led on mine 289 - it was well soldered and seemed like new, but fails if dmm is not in bright light. It was never in field - mostly desk work. I think it's a design flaw but in a different way - led degradation... Not well thought design decision or not very high quality leds at assembly...p.s. moreover, why would you put such a protection on a device which is clearly not for novice?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 10, 2024, 11:50:11 am
content: well distraction (s) happenssay you forget that your leads are in 10 amps and you measure an ac voltage ..... that's why some brands use probes hole caching methods