mercotronic mdl 9800 tester.

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  • April 4, 2015 at 6:59 pm #1109
    jeffreyward2
    Participant

      Does anyone know someone who can repair this tester ? It does not test condensers . Reason is bought a battery from Battery plus bulbs and the top plate from factory duracell 903 . Positive and negative were reversed from factory . I called Arthur at mercotronic they have parts but don’t service these testers . I am trying to get duracell to pay for repair they are going to have corporate call me . Any help would be appreciated ! My name is Jeff & phone number is 414-708-5784 or email rugercarbine40@gmail.com .

      April 4, 2015 at 11:29 pm #13348
      debe
      Participant

        Will email some pictures later today of the circuit board with what is most likely to be damaged by reverse polarity. It should only be a couple of diodes & or the NE555 ic.

        April 5, 2015 at 7:21 am #13360
        debe
        Participant

          Went to post pictures & you email address doesn’t seem to work. So the most likely part that’s faulty will be the NE555 IC, check P8 on the IC it should have +5v DC on it, if it does then replace it they are cheep about $1 ea.

          April 6, 2015 at 10:28 pm #13432
          jeffreyward2
          Participant

            I’m not a member so that could be why . I’m not good at electronics repair , that’s why I’m asking for repair help. Mechanics is easy for me . Email is rugercarbine40@gmail.com or phone 414-708-5784 . I would really appreciate the help .

            April 6, 2015 at 10:31 pm #13433
            jeffreyward2
            Participant
              quote debe:

              Went to post pictures & you email address doesn’t seem to work. So the most likely part that’s faulty will be the NE555 IC, check P8 on the IC it should have +5v DC on it, if it does then replace it they are cheep about $1 ea.

              I do not have a schematic or know the names of parts Please help debe !!

              April 7, 2015 at 10:44 am #13463
              debe
              Participant

                Hi Jeff have sent an email with pictures, apears to be successful this time. Incidently I am in Australia. Forgot to mention in the email the picture with the 555ic pin 8 is at the point of the biro to measure for the 5v.

                December 4, 2017 at 12:35 pm #68244
                debe
                Participant

                  This is where there should be 5V on the IC. Also the Zener diode that is part of the 5v supply to the 555IC.

                  December 4, 2017 at 3:45 pm #68245
                  jeff-register
                  Participant

                    US Member

                    Debe,
                    Triple 5 timer is one of the oldest chips around sept the 556.
                    Jeferyward, I can send a diagram of the 555 if you want. Need a solder sucker & low temp pencil & it’s easy. Look for the notch & replace in the same direction.

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