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    #1

    Need help on Fluke 87-III mainboard repair

    Hi there!

    I replace caps for a living, but recently decided to try and fix a multimeter I picked up at a yard sale:

    Fluke 87-III

    It is in surprisingly good shape, needs a new battery door and case perimeter seal, seller told me it was operating intermittently.

    so I took it apart and two components are burned which I believe are the following:

    U1 - diode, SI, rectifier, bridge (4 pin chip) -burned beyond recognition (on regular 87 - this chip is BV=50V, IO=1A, p/n DF01M - not sure on 87-III)
    CR1 - diode (marked LTp01 S1G) - (1N4007 is used on regular Fluke 87)

    and one of the mainboard traces connecting those is lifted off, will need to be replaced with heavy wire I reckon

    everything else looks great including beautiful white backlit display

    apparently, some Beavis used cheap fuses rather than the correct Fluke/Bussman fast-blow and then tried to measure high voltage with the cables plugged into amps jack

    any advice on what components I might want to order at digikey? - or just any general advice?

    I fix engine computers (ECU's) so I have pretty good experience and equipment including Hakko FM-202 solder station as well as Hakko 850D hot air rework station.


    This meter also needs a good battery door and it especially needs the main rubber seal around the perimeter of the case if anyone has an extra used one. (I have PayPal!)

    thanks!

    Attached Files
    Last edited by Per Hansson; 10-15-2016, 01:57 AM. Reason: Offsite image uploaded
    __________________


    the BIG 4

    ~~~ the top tier of low-ESR electrolytic capacitors ~~~

    Tags: None
    #2
    Re: Need help on Fluke 87-III mainboard repair

    Originally posted by theOracle View Post
    seller told me it was operating intermittently.
    Do basic functions like volts and ohms work fine? Are measurements close to another known good multimeter?

    so I took it apart and two components are burned which I believe are the following:

    U1 - diode, SI, rectifier, bridge (4 pin chip) -burned beyond recognition (on regular 87 - this chip is BV=50V, IO=1A, p/n DF01M - not sure on 87-III)
    CR1 - diode (marked LTp01 S1G) - (1N4007 is used on regular Fluke 87)
    I don't have a Fluke 87 III (would love to have one again some day), but others do and may be able to contribute some info. I may have some high resolution pictures saved somewhere? I will have to look around.

    and one of the mainboard traces connecting those is lifted off, will need to be replaced with heavy wire I reckon
    Let's see a picture of it and where it is on the board.

    everything else looks great including beautiful white backlit display
    The latest versions had the white backlight whereas the earlier versions had a green one.

    apparently, some Beavis used cheap fuses rather than the correct Fluke/Bussman fast-blow and then tried to measure high voltage with the cables plugged into amps jack
    Yup, they need to be the proper fuses.

    any advice on what components I might want to order at digikey? - or just any general advice?
    Once the components are identified, clean the area with a generous amount of IPA and remove any carbon residue as it conducts.

    This meter also needs a good battery door and it especially needs the main rubber seal around the perimeter of the case if anyone has an extra used one. (I have PayPal!)
    I see them on sale once a while on ebay. At $30 USD, it is way too expensive for my liking.

    http://www.ebay.com/itm/252355795852
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      #3
      Re: Need help on Fluke 87-III mainboard repair

      here are my candidates: (based on Fluke 87 info, not 87-III)

      for the bridge rectifier chip

      for the diode
      __________________


      the BIG 4

      ~~~ the top tier of low-ESR electrolytic capacitors ~~~

      Comment

        #4
        Re: Need help on Fluke 87-III mainboard repair

        On my Fluke 85 III, I have DF06S. 47 cents at digikey.

        http://www.digikey.com/product-detai...SCT-ND/3042771

        This is 600V vs 100V used in the original Fluke 87.

        For the diode, I have a backwards c ii 214 on the top line and S1B on the bottom line.

        I will have to search for this code. I don't know who makes that backwards c ii symbol?
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          #5
          Re: Need help on Fluke 87-III mainboard repair

          I think if I could just find a service manual for 87-III and a case perimeter seal and a battery door, I would be all set!
          __________________


          the BIG 4

          ~~~ the top tier of low-ESR electrolytic capacitors ~~~

          Comment

            #6
            Re: Need help on Fluke 87-III mainboard repair

            Originally posted by theOracle View Post
            here are my candidates: (based on Fluke 87 info, not 87-III)

            for the diode
            Your choice of S1M is rated at 1000V maximum repetitive reverse voltage. S1B, in my Fluke 85 III, is rated at 100V.
            Last edited by retiredcaps; 10-14-2016, 09:54 PM.
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              #7
              Re: Need help on Fluke 87-III mainboard repair

              Originally posted by theOracle View Post
              I think if I could just find a service manual for 87-III
              You won't find a service manual with a BOM or schematic for the 87 III.
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                #8
                Re: Need help on Fluke 87-III mainboard repair

                According to pictures in this thread.

                http://www.eevblog.com/forum/repair/...ii-misbehaves/

                Picture P1120655 shows a S1G which is 400V maximum repetitive reverse voltage and DF06S as well like my Fluke 85 III. That matches your post #1 part.
                Attached Files
                Last edited by retiredcaps; 10-14-2016, 09:56 PM.
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                  #9
                  Re: Need help on Fluke 87-III mainboard repair

                  Originally posted by retiredcaps View Post
                  You won't find a service manual with a BOM or schematic for the 87 III.
                  I don't want to even say what I think of that, given the $$ we engineers and techs have spent on Fluke over the years, but pathetic is not a strong enough word.
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                  the BIG 4

                  ~~~ the top tier of low-ESR electrolytic capacitors ~~~

                  Comment

                    #10
                    Re: Need help on Fluke 87-III mainboard repair

                    Originally posted by theOracle View Post
                    I don't want to even say what I think of that, given the $$ we engineers and techs have spent on Fluke over the years, but pathetic is not a strong enough word.
                    In today's world, virtually no manufacturer, Fluke, Keysight, Chinese brands, etc gives out schematics or service manuals anymore.
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                      #11
                      Re: Need help on Fluke 87-III mainboard repair

                      Don't I'm super tired and didn't even notice the S1G in post #1. Doh!
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                        #12
                        Re: Need help on Fluke 87-III mainboard repair

                        what is significance of S1G ?

                        and are my selections at Digikey ideal?
                        __________________


                        the BIG 4

                        ~~~ the top tier of low-ESR electrolytic capacitors ~~~

                        Comment

                          #13
                          Re: Need help on Fluke 87-III mainboard repair

                          Picture P1120655 shows DF06S.
                          Last edited by retiredcaps; 10-14-2016, 10:02 PM.
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                            #14
                            Re: Need help on Fluke 87-III mainboard repair

                            Originally posted by retiredcaps View Post
                            In today's world, virtually no manufacturer, Fluke, Keysight, Chinese brands, etc gives out schematics or service manuals anymore.
                            I have a rule on new equipment procurement:

                            no schematic, BOM, component locator diagrams, and calibration procedure = NO SALE!
                            __________________


                            the BIG 4

                            ~~~ the top tier of low-ESR electrolytic capacitors ~~~

                            Comment

                              #15
                              Re: Need help on Fluke 87-III mainboard repair

                              Originally posted by theOracle View Post
                              what is significance of S1G ?

                              and are my selections at Digikey ideal?
                              The last letter denotes maximum repetitive reverse voltage. I would stick to the original that is in the meter and avoid any "upgrades".

                              In post #4, I gave you the link to DF06S. So buy S1G and DF06S from digikey and you should be good.
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                                #16
                                Re: Need help on Fluke 87-III mainboard repair

                                thanks for EEVBlog pics - that is exactly the meter I have!
                                Last edited by theOracle; 10-14-2016, 10:19 PM.
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                                ~~~ the top tier of low-ESR electrolytic capacitors ~~~

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                                  #17
                                  Re: Need help on Fluke 87-III mainboard repair

                                  Once you order the parts and get them installed, please report back to see if current measurement works or not.

                                  I hate it when there is no resolution one way or another (it works or it doesn't work).
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