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Power supply problem

Discussion in 'Troubleshooting and Repair' started by anf_andrei, Dec 10, 2014.

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  1. anf_andrei

    anf_andrei

    2
    1
    Dec 10, 2014
    hy all
    i have a chinese power supply ZHAOXIN 1501a (write on pcb) and i try to change potentiometers for voltage controls.
    for this i had to remove 2 resistors to access the board to desolder that 2 old potentiometer.
    i didn't maje a note of positions of this 2 resistors and now i don;t know where to connect it
    1 resistor is 1ohm 5w 2nd resistor is 0.1ohm 5w
    can you help me to find the connection point for this?
    the IC is MC1723CP and final transistor is 2n3055
    http://imagizer.imageshack.us/a/img537/5198/UQctrV.jpg
    http://imagizer.imageshack.us/a/img910/2017/FxcaWf.jpg
    http://imagizer.imageshack.us/a/img905/990/0SxdoV.jpg
     
    Zaman1358 likes this.
  2. Gryd3

    Gryd3

    4,098
    875
    Jun 25, 2014
    You need to upload better pictures... those are way too blurry and hard to see...
     
  3. anf_andrei

    anf_andrei

    2
    1
    Dec 10, 2014
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