SANSUII BA-3000 PROBLEMS

Discussion in 'Exclusively Sansui' started by pppoffice, Aug 30, 2017.

  1. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    I'm back and survived my adventure to the Missouri DMV. I am now a licensed driver for another 5 years (if I live that long). I will do these tests right now and get back to you in a few minutes. I guess your problems with your Vette is the batteries charging system. I use to build and race Altered's, Gasser's, and Funny Cars in Florida and California. Lions Drag Strip was my weekend home for years and years. Now due to my health I can't even get under my ridding mower to change the oil. I hate it.
     
    vigman likes this.
  2. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    Yes, I already replaced R-05 and R-06 with new 1% MF resistors on both boards. Mouser Electronics just emailed me with the tracking number for my huge order of MF resistors. They should be here tomorrow. I also purchased the cross ref. diodes to replace the ZD diodes if necessary. Now I wish I could find the 3 pin molex style connectors that go on the 2513 board. The previous owner had cut them off and soldered all the leads that go to the 2513 board. ZD-02 checked out just fine as did TR-03 and TR-04. TR-03 was hFE=131 and Vf=744. TR-04=hFE=106 and V=773. ZD-02 was Ir=5.9 um, UF=886 mv, and C=0 mf
     
  3. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    Have R-12,13,23 & 24 changed out?
    Passive test
    Pull out TR-13 & 14 test
    Test R17 ,18 & 20 if not changed out
     
  4. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    I will go right now to see if those resistors have already been changed and if they haven't I will check them. I already tested TR-13 and found it to be good. I tested it because of the problem we had with in on #1-2508. I will test TR-14.
     
  5. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    Here are your readings. R-12 has been changed for a MF. R13 is good R23 is good, R24 is good, R17 is good, R18 is good, and R20 is good. Both TR-13 and TR4 test good.
     
  6. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    I meant to say TR-13 and TR-14 test good instead of TR-13 and TR-4 test good. If you get me some more requests in the next 5-10 minutes I should be able to get the results before I stop for dinner. I will be back after dinner about 6 PM Central Time.
     
  7. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    well this one is a bit of a stinker.....
    Passive test:
    TEST TR 12 & 15
    R-33,34 ( THAT 1 K IN THAT LADDER MARKED R-24 ) R-35
     
  8. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    If all this checks out ok ( whch I think it will ) This points to a bad connection / cracked trace... let me review the notes & make a mark up sheet
     
  9. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    Starting mark up sheet.... drilling back thru posts
     
  10. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    Here's what I have so far :
    Resistors
    5,6 12,13,14,17, 18, 23 ,24 OK

    Transistors
    TR3,4, 13, 14 OK

    ZD-02 OK

    Waiting on:
    TEST TR 12 & 15
    R-33,34 ( THAT 1 K IN THAT LADDER MARKED R-24 ) R-35

    questions
    Did we test TR-11 & 16 ?

    Current state
    TR-11 collector + 77
    TR-16 emitter - 80
    ZD-02 V drop 6.5

    Output
    + 6.9
    - 5.7
     
  11. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    Things that make me go HMMMMMMM
    1) The balance of TR-11(C) & 16 (E) should not be that far away.. make me suspect of cold solder or funky edge connector. It's feeding right from the 85 volt rails with a 330 ohm in series...
    2) The base of those 2 is being pulled to hard to common, ergo the low out...
     
  12. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    I SCREWED UP!!!!!! At dinner I started wondering if I really checked TR-14 or did I check TR-4. I don't know why, but I thought I might have screwed up and sure enough, I DID!! TR-14 was horrible bad. After changing it for one of the cross ref. transistors here are the readings I now get from #2-2508. Big caps +70.8 & -70,8. B+- +87.3 & -87.4. Sixty (60 volt) section +70.8 & -70.8. Thirty-Five volt section +16.9 & -16.0. I just didn't get enough sleep.
     
  13. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    I just got your request to tes TR-12 & TR-15. Then I see you need a check on R-33 & R-34. I don't show where I tested TR-11 or TR-16 from all my notes so I will check those and everything mentioned here right now, and try to stay awake. I drinking a strong cup of coffee right now.
     
  14. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    Well TR-14 is our first fail , and things are looking better.. I would prefer if you DIDN'T work tired... we can pick this up tomorrow
     
  15. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    I'm fine now. I just had to get up 4 hours earlier than normal and do it without any coffee at all until near noon. This cup has my eyes wide open and I'm ready to re-roof the house right now.

    All of the transistors and resistors checked just fine and R-33 is now a MF. All of my MF 1% resistors are to be here tomorrow. All of my stereo friends wanted everything I bought so I bought 100 to 150 of each value to be divided up among us. I had a big surprise during dinner (that is besides my screw up), one of my friends called and said that he has had a BA-2000 sitting in his closet for over 10 years and asked if I wanted it. Heck Yes I want it. A chance to try out what I have and am learning right now somewhere down the road after the 100 projects that I already have. I think I am caught up now with the readings you wanted. Bring it on. I'm hungry and could sure use a Biscuit (but that's probably out the window after this latest screw up.
     
  16. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    BA 2K will be a bit of a wrestling match internally but hey GGGOOOAAALLLLLL !
    Mike most of my mistakes are made when I'm tired then over caffinated !

    So I can mark EVERY R on my sheet??
     
  17. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    You get a DOUGHNUT when this is board is repaired !
     
  18. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    Make it a Bllueberry doughnut please. What's next DOC?
     
  19. pppoffice

    pppoffice AudioBear Subscriber

    Messages:
    283
    Location:
    South of KC, Missouri
    Yes, I think so. Even if we missed one I will be replacing ALL of the rest of them with the 1% MF resistors tomorrow if I have the time. That is if UPS gets them here. They have been missing quite a few deliveries to me on time lately. Well, I guess we are taking the evening off so I will go do some more dressing of wires in this amp. I'm still trying to find some of the connectors used on the 2513 board. Mouser Electronics has ZILLIONS of different connectors and they don't call them what I call them so my searches are not working. I will keep trying to find the 3 pin and 2 pin variety this evening. If you know what they are called, please let me know.
     
  20. vigman

    vigman SUBSCRIBER

    Messages:
    3,758
    Location:
    Valencia CA
    Test TR 11 & 16??
    Passive test:

    TEST TR 12 & 15
    R-33,34 ( THAT 1 K IN THAT LADDER MARKED R-24 ) R-35
     

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