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  • SMPI issue

    hello, little question about my original SMPI from whites which is broken, the tuner
    potentiometer is brand clara mexico 10 kilo-ohm with an on / off switch, on my knob when
    the potentiometer is closed, it leads and when I open it, it is cut which is the
    opposite of an on / off switch, on the attached original diagram *
    and on my PCB, it is the P6 which is positioned between the
    zener D5 and the resistorr R32, so, normally open or normally closed, thanks

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  • #2
    in batt chk position is closed. click... opened pins... you may tune...click... you hear a zoom... batt voltage is norm...

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    • #3
      smp? again

      good evening and thank you but I misunderstood your answer, I summarize, when the detector is off the tune pot switch is closed as in photo 1 and when I turn the pot, there is a click and the switch opened as on photo 2 what cuts the signal, is this normal given that for me as a repairer of electronic devices a switch is normally closed when stopping cutting all signal and creates a contact when we turn its axis with the sound of a click which establishes the passage of a signal, on my potentiometer, it is the opposite , thank you

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      • #4
        when I turn the pot, there is a click and the switch opened as on photo 2 what cuts the signal
        ---
        ok. first point. switch closed, it is First Position, yea? then a voltage from power supply, positive potencial,
        go on output speaker driver. you hear constant zoom, if BATTERY VOLTAGE LEVEL is hight.
        U7/A clatsz clatsz on GND... from U4/D... you hear the Modulation of THE potencial/DC/power.

        second point. you turn the pot and ... click... you tune the pot in same position.
        switch opened. you hear a reaction on metal/target. this is work state. THE Hunting.

        what is not clear for your understanding?


        on the sch. CLOSED IN CCW [position]. COUNTER CLOCK WISE.
        Attached Files

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        • #5
          hello , now it's clear , thank you very much

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