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Problem with multimeter DT9205A

Discussion in 'Troubleshooting and Repair' started by Automatics, Oct 3, 2021.

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  1. Automatics

    Automatics

    2
    0
    Oct 3, 2021
    The problem is when it is on continuity mode on the display shows reading 393 beeper still works but I cant test leds. On 20kΩ/200kΩ display shows 2.40/02.4. The problems appear when accidentally when it was on continuity mode my dad used it in a 220 AC curcuit. I opened it but didn't saw any obvious damages. Any idea how can I fix it or what is wrong with it. Thanks!
     
  2. PETERDECO

    PETERDECO

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    45
    Dec 19, 2019
  3. Automatics

    Automatics

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    0
    Oct 3, 2021
    Yeah I know I can buy new one cheap but I was wondering if someone had an idea what could be
     
  4. Allen Bong

    Allen Bong

    4
    1
    Dec 5, 2014
    Here is the schematic of your digital meter meter...

    Since you said that your dad connected the probe to AC on the continuity test mode, I'd check all the components connected to point "J" like ptc1 and ptc2, 900K and 100K resistors etc.. IC2b and IC2c (LM324) are probably also gone as well.

    dt9205a_excel_multimeter_sch.jpg
     
  5. Riyadh1959

    Riyadh1959

    4
    0
    Friday
    Hi every one

    The problem is when it is on continuity mode on the display shows reading 180 beeper still works but I cant test leds. On 20kΩ/200kΩ display shows 2.40/02.4 . Any idea how can I fix it or what is wrong with it. Thanks!
     
  6. 73's de Edd

    73's de Edd

    3,154
    1,323
    Aug 21, 2015
    Riyadh1959 . . . . . . is you also being . . . . . . Automatics . . . . . . .or has he permanently left the arena . . . . .along with Elvis ?
     
  7. Riyadh1959

    Riyadh1959

    4
    0
    Friday
    I had same problem with referent number?
     
  8. 73's de Edd

    73's de Edd

    3,154
    1,323
    Aug 21, 2015
    Try the voltmeter functions and see how accurate they are.
     
  9. Riyadh1959

    Riyadh1959

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    Friday
    When I test the led food it must be light but it don't ?
     
  10. Riyadh1959

    Riyadh1959

    4
    0
    Friday
     
  11. 73's de Edd

    73's de Edd

    3,154
    1,323
    Aug 21, 2015
    We know that . . .that's understandable, BECAUSE the diode test function has BLOWN UP ancillary parts within it and 240mv is borderline of being able to light up even the lowest threshold of LED . . . the RED LED.
    Come back with the requested functionality and accuracy test of the voltmeter portion of the unit.
     
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