Products > Test Equipment
Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)
JohnDee:
I have a Fluke 189 multimeter. It suddenly died (nothing shows on the LCD display). I changed the 4 batteries (the old batteries were only slightly below normal). The two fuses checked OK. Inspection of the circuit board shows some leaking on a small (6.5mm diameter) surface mount battery. The marking of this two-tab coin cell has the logo of Matsushita (now Panasonic) and the numbers 3709. I could not identify this cell on the web in order to find a suitable replacement. I am hoping somebody can help...
retiredcaps:
--- Quote from: JohnDee on November 04, 2013, 09:13:06 pm ---Inspection of the circuit board shows some leaking on a small (6.5mm diameter) surface mount battery. The marking of this two-tab coin cell has the logo of Matsushita (now Panasonic) and the numbers 3709. I could not identify this cell on the web in order to find a suitable replacement.
--- End quote ---
I suggest you clean up the leakage with a q-tip/toothbrush with a generous amount of IPA.
I remember seeing an ebay auction for what you are talking about ...
http://www.ebay.com/itm/281103728372
Right now, I can't find any more information regarding the specifications.
retiredcaps:
It might be the Panasonic EN gold capacitor?
http://www.panasonic.com/industrial/components/pdf/goldcap_tech-guide_052505.pdf
JohnDee:
You are right !!! It is indeed a Panasonic EN gold capacitor. I see that it is available at Mouser ($2.84 unit price). I will order it and hopefully it will fix the problem. I also read the Panasonic Technical Guide you sent me and reading at sections 4.1 and 4.2 on expected lifetime it seems to me that selecting that capacitor was a poor design choice with a surface mounted component having to be changed after barely a few years of usage...
Thanks for the great help !
BravoV:
Damn, is this leaking supercap at the board is a serious problem plaguing the fluke dmm 180 & 280 series ? :-\
As a new owner of 287, this makes me worry as I just knew it.
JohnDee, please post the photo of that leaked cap and the damages at the pcb if any.
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