| 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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