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B&k 507 reduced volume right speaker with no surround volume at all

Discussion in 'Troubleshooting and Repair' started by Mattydaddy, Jul 5, 2018.

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  1. Mattydaddy

    Mattydaddy

    9
    0
    Jun 16, 2018
    Good afternoon all .I have a 12year old b&k components 507 audio receiver that now has a problem . I decided to use an audio spl meter and use it's onboard audio test tone at all channels to test audio levels and it appears all rear surround speakers are dead and the right front speaker sounds like the mid is blown(only slight sound from tweeter). I also tested audio from unit with a video essentials dvd disk with same results. The unit worked great last time it was on any assistance would be greatly appreciated. Also Unit has had a reduced brightness on display since i purchased that you can see but it is dark I have not repaired. Thank you for your assistance
    I replaced all capacitors in unit approx 2 years ago.
     
  2. Mattydaddy

    Mattydaddy

    9
    0
    Jun 16, 2018
    UPDATE Have torn system apart and appears I have two blown drivers on one side will fix and update. Is it possible to loose all 4 rear surround due to a driver of front right speakers tearing a voice coil lead . It did fry my woofer in same box. Thank you all and will continue to update
     
  3. shrtrnd

    shrtrnd

    3,816
    518
    Jan 15, 2010
    I don't know if your unit has internal speaker fuses, but when you've got the unit repaired, I'd definitely consider installing them if they're not there.
    (Either that, or invest in some higher wattage speakers)
     
  4. 73's de Edd

    73's de Edd

    3,086
    1,302
    Aug 21, 2015
    Sir Mattydaddy . . . . .

    B&K AVR507 . . . .
    Can you confirm that each power output amp section consists of a complementary set of (3) 2SK1058's and (3) 2SJ162's power FETS, and that they are using a 2N5416/2N3440 set as drivers, to confirm that I am consulting the proper schematic ?

    THE
    . . . . . B&K, is being a test equipment manufacturer to me.

    73's de Edd
    .....
     
  5. Mattydaddy

    Mattydaddy

    9
    0
    Jun 16, 2018
    Thank you for quick response iwill confirm the fets tomorrow when I'm home
     
  6. Mattydaddy

    Mattydaddy

    9
    0
    Jun 16, 2018
    The rear surround speakers were dvc russound but only 5 1/4. The fronts with torn lead and blown woofer were b&w 804 ,never heard anything out of the ordinary.
     
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