AU D11ii, G99x, G90x, G77x, and d77x Service Bulletin resistors ?

Discussion in 'Exclusively Sansui' started by ecommers, Mar 17, 2017.

  1. ecommers

    ecommers New Member

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    Location:
    Walker Minnesota
    Has anyone done this upgrade? The reason I'm asking is I'm rebuilding another AU D11ii and as I read the instructions it saying to replace R1 thru R4 with 820ohm which is fine except the AU D11ii has 510ohm resistors populating those spots. I'm thinking to replace the same value as that's what worked before.
    Just want to be sure with my interpretation of the instructions.

    Thanks Ed AU-D11 II Service Bulletin 1018.jpg
     
  2. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    You seem to be misunderstanding the whole point of the service bulletin - it was released with a recommendation to change the values of those resistors. Or if they are already 820 ohm - to make sure they are ½ watt flame proof types - that is what you have to do - simple.

    The changes are for safety or operational reasons, as described in the 'symptom' section of the bulletin (just above the instruction regarding resistor changes).

    If you replace the resistors with the same value, you might as well not have read the bulletin at all. :rolleyes:

    (sorry I'm in a 'sassy' mood this afternoon).
     
    Last edited: Mar 17, 2017
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  3. ecommers

    ecommers New Member

    Messages:
    23
    Location:
    Walker Minnesota
    Thanks I'll go with the 820ohm.
     
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  4. LBPete

    LBPete Rolling Along Subscriber

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    Please post the serial numbers for the database.

    - Pete
     
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  5. ecommers

    ecommers New Member

    Messages:
    23
    Location:
    Walker Minnesota
    SN 654019782 The one I'm working on
    SN 673117748 My first one
    Both are AU D11ii
    Been busy this winter with other restorations.
    G-7700
    G-8700db SN 810080274
    Sansui SE-7
    Fisher CA-271 (for my sister)
    HK 330b
    PS Thanks for the Trophy
     
    Last edited: Mar 20, 2017
  6. ConradH

    ConradH AK Subscriber Subscriber

    Messages:
    7,159
    Location:
    Canandaigua, NY
    I find the D11ii darn near impossible to work on. Is there a trick for better access?
     
  7. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Not that I have found. :)
     
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  8. ecommers

    ecommers New Member

    Messages:
    23
    Location:
    Walker Minnesota
    TIME and PATIENCES !
    Make sure you have lots of room on your work bench.
    I find it very helpful to first remove the transformer. Mark all your sockets and unplug. Desolder the one transformer white wire going to (F-4287 Protector/power supply board).It really helps having all that weight removed.
    Then I start on that side of the amp F-4292, F-4287, and F-4291. Then I move to the front that's when thing really start to fall apart. I place the unit on a piece of sample carpet. It kind of helps keep things somewhat organized and its great if you have to spin the unit around. If your doing the main amp board you've pretty much totally dismantled the unit. Again use the carpet to help hold it somewhat together.
    Happy Soldering
    Ed
     
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  9. fonon

    fonon Active Member

    Messages:
    253
    Could you send the next pages? Especially with AU-G77X.
    Regards,
    f.
     
  10. Hyperion

    Hyperion Roobarb & Custard Subscriber

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  11. fonon

    fonon Active Member

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    Thank you Hyperion.
    Regards,
    f.
     
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