Products > Test Equipment

Fluke 189 with leaking surface mount supercap (also Fluke 287, Fluke 289)

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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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