919

Discussion in 'Exclusively Sansui' started by Willy6, Aug 17, 2017.

  1. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Wooh-Hooo ! - congratulations. :banana:
     
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  2. Willy6

    Willy6 AK Subscriber Subscriber

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    I was lucky and all of the original outputs tested good..
     
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  3. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    :whip:
     
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  4. Willy6

    Willy6 AK Subscriber Subscriber

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    Here are the parts replaced so far F-2839 20170924_095506.jpg and F-2845 20170924_095523.jpg
     
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  5. Willy6

    Willy6 AK Subscriber Subscriber

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  6. Willy6

    Willy6 AK Subscriber Subscriber

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  7. Willy6

    Willy6 AK Subscriber Subscriber

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  8. Ronito6

    Ronito6 Super Member

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    Did you use your Peak Atlas DCA 75 to pronounce those transistors and diodes dead / shorted or low Hfe?

    I use threads like this as my schooling, so I hope to hear why certain decisions were made so I can copy your process.

    Thanks for the great thread!! BTW
     
  9. Willy6

    Willy6 AK Subscriber Subscriber

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    Yes I started checking transistors with the peak atlas and found a few shorted so I decided to replace all of them accept the drivers because they tested good and I didn't have a replacement for one of them.As for the diodes I always change the zenners and the small 1s2473's when I see them..
     
  10. Willy6

    Willy6 AK Subscriber Subscriber

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    Working on F-2835 now and I was able to get the corrosive blackish brown glue cleaned up removed quite a few infected resistors,capacitors and transistors and ready to move forward..I wonder if those two blue trimmers should be replaced?They appear to be sealed.. 20170930_160647.jpg 20170930_160732.jpg
     
  11. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    I recommend you replace them, they are enclosed but not airtight, which means they can have oxidised inside, and cleaning them is impossible.
     
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  12. Overundr1

    Overundr1 AK Subscriber Subscriber

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    Just noticed you have a set of Klipsch Forte's in the background. My restored 717 makes them sing nicely what with Crite's upgrades, will be interesting to hear your thoughts once you get the 919 rebuilt.
     
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  13. ghamilton

    ghamilton Super Member

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  14. Willy6

    Willy6 AK Subscriber Subscriber

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    Yep those forte's should match up with the 919 nicely..
     
  15. Overundr1

    Overundr1 AK Subscriber Subscriber

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    Congrats on reaching 1000 posts sir :)
     
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  16. Willy6

    Willy6 AK Subscriber Subscriber

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    Well I got F-2840,F-2833,F-2835 and F-2841 all done and everything buttoned back up today..I did the bias and dc offset adjustments on my dbt with a 150 w bulb..set all of the other trimmers to the middle position and then plugged it directly in to the wall and let it warm up for 10 min and found that on F-2835 I was able to set the right side at 0 mv but the left reads 425v Luckily that board is easy to get to..and also F-2833 is giving me a headache..I was able to set the right channel vr04 and vr06 both to 1 20171004_190832.jpg 0mv but I could only get around 30mv on the the left vro3 and vro4 time to check resistors on that board I think.
     
  17. Willy6

    Willy6 AK Subscriber Subscriber

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    I think I need bigger trimmers in F-2835 the ones I pulled out said 330 on them but the manual says 220 ohm and since I didn't have any 330 ohm I put the 220's in there and they wont adjust down far enough the only Biggers ones I have are 500 ohm guess I'll put those in and see what happens.
     
  18. ghamilton

    ghamilton Super Member

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  19. Overundr1

    Overundr1 AK Subscriber Subscriber

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    Dont have the schematic handy however are there any fuseable reistors on that board and if so and you changed them out perhaps a mistake in replacement resistor value?
     
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  20. Hyperion

    Hyperion Roobarb & Custard Subscriber

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    Take a look here at this link - http://www.audiokarma.org/forums/index.php?threads/new-addition-au-919.467393/page-4#post-6114448 - I used 200ohm - and had no problems.

    Are you sure you have the right value trimmers in there now, perhaps measure them?
     

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