Electronics > Repair
Fluke 87-I repair
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retiredcaps:

--- Quote from: staze on February 20, 2014, 07:02:09 am ---If you have the unit apart, could you tell me what R61 measures as (in circuit)?

--- End quote ---
I see R61 on modemhead's picture here

http://mrmodemhead.com/blog/wp-content/gallery/f87_00/F87FR_009.JPG

but my board doesn't have R61.

My board is Rev H.
staze:
lol! Crooked! Weird... it's like the pick and place for that one was misaligned.

My board is rev P in sharpie on the back, or rev K by the "silk screen" (looks more like solder mask covered trace).

I get about 1Meg between the battery terminals in the off position. Do you get OL/Open?
retiredcaps:

--- Quote from: staze on February 20, 2014, 07:17:02 am ---lol! Crooked! Weird... it's like the pick and place for that one was misaligned.

--- End quote ---
I can open another 87 to take a look, but it is getting late so I don't want to make any mistakes.


--- Quote ---I get about 1Meg between the battery terminals in the off position. Do you get OL/Open?

--- End quote ---
I get around 1.04Mohm.

This will be my last post (early AM).  I can take more tomorrow.

staze:
well, then the 9.6uA when the unit is off makes sense. =P

At this point, I have a bad R1, bad R2, and a bad R29. Doesn't explain the voltage on the front end, but I actually haven't checked that since I removed those parts (will tomorrow).

What timezone you in (I see Canada, but not haven't looked where). =)
PedroDaGr8:

--- Quote from: staze on February 20, 2014, 07:02:09 am ---Scrubbed... nothing, no change. And all the pins look good.

If you have the unit apart, could you tell me what R61 measures as (in circuit)? I ask because the reflow process for this meter and that resistor appears to have gone wonky, since it's at a diagonal. Probably not a real issue, but it has drawn my attention the whole time. It's supposed to be a 2.2M resistor (and that's what it's marked as (225), but in circuit, it measures only 7.2K, and it's the only SMT component that's crooked.

Thanks!

--- End quote ---
I just tore apart my working 87-I and the only resistor I could find marked 225 near u6. For some reason, I don't see r61 on the board diagrams in the service manual pdf I have. Anyways, when I measure across it in circuit (no battery, set to off) I get 8.554K.

Sent from my EVO using Tapatalk

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