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Panasonic stereo no power

Discussion in 'Troubleshooting and Repair' started by Steeve, May 8, 2020.

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  1. Steeve

    Steeve

    1
    0
    May 8, 2020
    Hi ,is there anybody who can help me with my Panasonic SA-MAX 770 stereo? I’ve got no power on. Checked the power cord fuse , burnt caps and checked the bridge on board. Seems good. Don’t know what to do further??? Help please
     
  2. Martaine2005

    Martaine2005

    3,217
    883
    May 12, 2015
    You may have checked them, but tell us how you checked them.

    Did your check also include VOLTAGE checks?. What were they?.

    Martin
     
  3. 73's de Edd

    73's de Edd

    3,046
    1,288
    Aug 21, 2015
    Sir Steeve . . . . .

    Wearing your BIG BOY pants ? . . . . if not better leave now, and go get them, and also grab your 3 in wide suspenders with their 12 grip clips and a HEAVY belt . . . ALSO . . . . might as well make it your pole linemans belt . . . .cause you're gonna need them on this task.

    I skimped with the mini sizing of the PCB foil layout, just considering that it will only be used to let you initially find your way thru the jungle in the boards parts locations.

    Of your initial interest will be the A-B9 corner where the RED oval is the AC line power entering the set, it has to pass thru two GOOD fuses at the YELLOW boxed points until you get up to the F-G 10 sector where AC is rectified to make raw DC power at C1403 E-cap.
    Confirm that raw B+ is being there after a power up of the set . . . . actually by just a plugging in of the set to AC power.
    Since, this PARTICULAR power supply section is basically being the "pilot light flame " of this " furnace ".
    If you have raw DC voltage across C1403 there . . . . and I don't know if you are using Amerikanski or You-are-a-peeing AC line voltage . . . . . if being the latter, 340-350 'ish volts .
    Then look to the inner chassis side of C1403 for the YELLOW boxed 8 pin IC1402 and give particular attention to its pin 5 corner to see if there is a hole burnt into that corner of the case or if the case might be split or have a corner blown off from it .
    If physically appearing O.K., then find the two BLUE marked up E-capacitors that your 3.3 VDC is being stored in and confirm that voltage presence.

    If all is well so far, then see if the set will power up and then you move over to C-1 corner sector and its connector CN1851 there and use meter DC ground referencing as connector pins 6-11 or 12.
    And only confirm the 15VDC and 3.3 VDC supplies presence .
    That connector schema snippet is shown at right bottom corner of page . . . PINK boxed.

    Waiting to see how it goes for you . . . . . .

    Le PUNYSONIC Schematique . . . . . .

    [​IMG]




    73's de Edd . . . . .


    Did you hear about the kidnapping at school?
    Oh h h h h . . . . it's all okay now, he woke up.


    .
     
    Last edited: May 8, 2020
    Tha fios agaibh and Martaine2005 like this.
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