Missing or low voltage at point TP4

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This topic contains 3 replies, has 3 voices, and was last updated by  yaelblaze 5 years, 2 months ago.

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  • 06.07.2018 at 18:19 #7733

    Gra Afch
    Keymaster

    It is necessary to check the resistance between the terminals LM3478/LM3488:
    https://photos.app.goo.gl/Kw9T3FW8v8MBn1oT7

    26.12.2018 at 04:01 #11604

    o_kanagawa-lj
    Participant

    Yes, my TP4 is 11V. What shall I do to correct this situation? I don’t understand your hand-writing memo.

    04.01.2019 at 09:11 #12513

    o_kanagawa-lj
    Participant

    5V area seems to work fine. RGB LEDs blink and I can hear the “pink panther”.
    Measured voltage at each LM3478 pin:
    #1 0V, #2 1.22V, #3 1.26V, #4 0V, #5 0V, #6 0V, #7 1.52V, #8 11.75V

    08.02.2019 at 17:53 #12695

    yaelblaze
    Participant

    You also might want to check this.

    We are aware of cases when the ULN2003 microcircuit failed (it has a very low resistance between the terminals), and this led to the burning of the diode on the Arduino.
    Normal resistance between GND TP and terminals 1,2,3,4,5,6 is 5kOhms – 9kOhms

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