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Kenwood KA1030 audio amplifier problem

Discussion in 'Audio' started by HellasTechn, Apr 25, 2018.

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  1. HellasTechn

    HellasTechn

    1,497
    210
    Apr 14, 2013
    Hello again !

    The amplifier mentioned in the title was gifted to me by someone who doesnt want to keep it because it is not working.
    I am thinking to fix it and keep it as spare.

    When i pluged it in it would not turn on and no LED'd in front panel came on. I opened it and found the mains fuse replaced by a wire.

    I have located two power transistors burned Q34 and Q36 also R52, R54 and R64 burned. I have replaced them all with same value components (appart from Q34 which i used A1695 instead of A1694).
    Now when i power it on the front panel LED's come on but within seconds it smokes R12. I have checked all tansistors and semiconductors around and found none damaged. Also i have checked Q10, Q12 and Q14 and are all good.

    Any ideas ?

    THANK YOU !

    P.S. since i can not post PDF file, the service manual can be downloaded from here :
    https://elektrotanya.com/kenwood_k_ka1030.pdf/download.html
     
  2. dave9

    dave9

    867
    213
    Mar 5, 2017
    Screenshot the PDF or print to image to post schematic.
     
    HellasTechn likes this.
  3. HellasTechn

    HellasTechn

    1,497
    210
    Apr 14, 2013
    Good idea. Here they are:

    Also the picture Mainboard marked shows the location on the circuit of the components i found faulty and replaced.
     

    Attached Files:

    Last edited: Apr 25, 2018
  4. HellasTechn

    HellasTechn

    1,497
    210
    Apr 14, 2013
    No ideas?
     
  5. kellys_eye

    kellys_eye

    4,277
    1,146
    Jun 25, 2010
    sure it's R12?
     
  6. HellasTechn

    HellasTechn

    1,497
    210
    Apr 14, 2013
    Yes. but i will triple check just to be sure.
     
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