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Error on a multimeter ?

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Discussion in 'Troubleshooting and Repair' started by Richard9025, Oct 8, 2016.

  1. Oct 8, 2016 #1
    Richard9025

    Richard9025

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    May 24, 2016
    Hello !
    I found this analog/digital multimeter , it looks brand new , not a scratch, it doesn't have a brand , only shows a model KT0732
    0.jpg
    It powers on , but it shows -1 on every function , only the decimal appears when i move from like 200 ohms to 200k ohms
    When i hook it to a baterry or any other power source , it shows .000 for 1 second and then it returns to -1
    The continuity check doesn't work , it should beep but it doesn't
    Also , a chip on the board (TL062CP) gets very hot (> 40°C) , I marked it with a red circle on the image below
    01.jpg
    Operator's manual , only thing I could found (direct download) : www.gbeshop.com/infobase/downloads/michale_product/kt7032.doc
     
  2. Oct 8, 2016 #2
    davenn

    davenn Moderator

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    Sep 5, 2009
    OK, it is a dual Op-Amp ... it may have failed, but most likely it isn't the initial cause of the failure.
    Hopefully you have another multimeter and you can quickly check the voltage on pin 8 of the chip


    Dave
     
    Richard9025 likes this.
  3. Oct 9, 2016 #3
    Richard9025

    Richard9025

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    May 24, 2016
    I have another multimeter that works , but I don't have a battery for it :p , I'll buy one and test the chip .
    Any other options ?
     
  4. Oct 9, 2016 #4
    davenn

    davenn Moderator

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    get that other multimeter working and start with measuring the asked for voltage, we can go from there
    it's going to be extremely difficult to impossible unless you can get hold of a circuit schematic

    and please photo BOTH sides of the board ... closer up ... 2 pix per side
    and MUCH BETTER lighting :)
    avoid dark areas and bright spots as you had in your previous post. DONT use a flash, natural lighting but not direct sunlight

    Dave
     
  5. Oct 11, 2016 #5
    Richard9025

    Richard9025

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    May 24, 2016
  6. Oct 11, 2016 #6
    davenn

    davenn Moderator

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    Richard9025 and (*steve*) like this.
  7. Oct 12, 2016 #7
    Richard9025

    Richard9025

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    May 24, 2016
    1.jpg

    2.jpg


    3.jpg

    4.jpg
     
    Last edited by a moderator: Oct 13, 2016
  8. Oct 14, 2016 #8
    Richard9025

    Richard9025

    205
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    May 24, 2016
    I bought a battery and I tested the chip , it measures 7.30-7.50 V DC
     
    Last edited: Oct 14, 2016
  9. Nov 3, 2016 #9
    Richard9025

    Richard9025

    205
    7
    May 24, 2016
    nothing ?
     
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