Help me with a very deep dive into the Aiwa PL77, PL777, & PX710

Discussion in 'Tech talk' started by 944 Dream, Nov 17, 2024 at 8:19 AM.

  1. 944 Dream

    944 Dream New Member

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    These three models are the same- and the p75, p705, px610 all use the same board and chassis. i have at least a half dozen of each of these- which i am only telling you to point out i checked inside more than one of each to compare


    I have a 610, 710, and a 77 that all are missing 'dsl 2' (but dsl 1 and off work)

    and the 710 and 77 both have an issue with the sound starting ok, but becoming rough/crackley after a few moments.


    i was going through everything with the help of @Silver965 who is incredibly knowledgeable when i came across several things that don't make sense or don't match the manual.


    the first thing on the front of the board is C91 which is in the manual board layout by the photo eye. (green)
    upload_2024-11-17_11-8-39.png upload_2024-11-17_11-10-10.png


    the second thing is an additional capacitor to the left of C59 & C60
    upload_2024-11-17_11-11-25.png
    upload_2024-11-17_11-13-24.png


    then, on the back, there are two resistors not shown in manual above r66 (and these are also on the px610)
    upload_2024-11-17_11-17-8.png
    upload_2024-11-17_11-18-35.png



    anybody got any clue whats going on?
     

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  2. Emiel

    Emiel Well-Known Member S2G Supporter

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    And C91, a capacitor, is directly connected to the motor IC it seems?
     
  3. Silver965

    Silver965 Well-Known Member

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    Hello starting from the px 610 diagram the C90 is connected on one side with R 107 and on the other with R 106... and the C90 is not where you indicate

    upload_2024-11-18_0-1-39.png




    ... Looking at the printed circuit board on both sides ... starting from R107 (Red) and following the green track You arrive at the C90 and R106 ..



    aiwa px 610A.jpg
     
  4. Silver965

    Silver965 Well-Known Member

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    always on the px 610 circuit ..
    in the photo where you indicate an additional capacitor on the 610 circuit there are none of the three and the transistors connected to them are also missing ...

    aiwa px 610B.jpg
     
  5. 944 Dream

    944 Dream New Member

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    @Silver965 I am talking about the px710, pl77, and pl707
     
  6. 944 Dream

    944 Dream New Member

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    And i am talking about c91

    upload_2024-11-17_19-35-33.png
     
  7. 944 Dream

    944 Dream New Member

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    px610 C90 = px710 C76

    upload_2024-11-17_19-41-2.png
     
  8. 944 Dream

    944 Dream New Member

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    Sorry for misleading post, see title... this thread is not about the 610, just noting the 610 is based on the same chassis and board but missing the led ic and plss. i've found a few other minor differences.

    upload_2024-11-17_19-45-0.png
     

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