KA-6100...board vs. schematic

Discussion in 'Kenwood-Trio/Kensonic-Accuphase' started by rjsalvi, Sep 5, 2017.

  1. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    I know schematics can have errors and it's generally accepted procedure to stuff a board with the same value one pulls out, but I have an anomaly that could just as easily have been an assembly glitch. The following resistors are stuffed back asswards from the schematic, but are also physically next to each other on the board:

    Rm27, 28, 39 & 40 call for 150K, but stuffed with 68K
    Rm25, 26, 37 & 38 call for 68K, but stuffed with 150K

    If anyone has an opportunity to peek under the hood of theirs and clarify it for me, I'd be much obliged. Grazie!
     
  2. gort69

    gort69 AK Subscriber Subscriber

    Messages:
    828
    Location:
    Vancouver, WA
    I.have an untouched one. I'll take a peek tomorrow
     
  3. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    Thanks, amigo.
     
  4. hopjohn

    hopjohn Kenwood Krazy Subscriber

    Messages:
    931
    Location:
    Dallas, TX
    I opened up mine for you, but I'm afraid what I found won't help you much, sorry.


    Rm27, 28, 39 & 40 call for 150K, stuffed with 160K
    Rm25, 26, 37 & 38 call for 68K, but stuffed with 150K

    :dunno: S/N 732057
     
  5. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    S/N 723978 Well, ain't that some doodoo. Tomorrow I'm going to lift a leg on the "68K" because they're measuring 78K in situ...then again, the color code is 76K! Ugh. I thought maybe mine was built on a Friday afternoon... ;)
     
  6. hopjohn

    hopjohn Kenwood Krazy Subscriber

    Messages:
    931
    Location:
    Dallas, TX
    FWIW in mine R26 and R28 measured 78K in circuit. The only two I put on the meter...it was tough without good lighting to see if the brown stripe code was brown or purple. I put my torch on it, and It was definitely brown. Doodoo brown.
     
  7. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    Brown and not purple. Okay. I'll pull a leg manana and see what I've got. Thx.
     
  8. gort69

    gort69 AK Subscriber Subscriber

    Messages:
    828
    Location:
    Vancouver, WA
    .Edit -

    I get the same as John

    27, 28, 39, 40 brown, blue, yellow, gold 160k

    25, 26 37, 38 brow, green, yellow, gold 150k

    A meter on one from each group - ~79k in circuit
     
    Last edited: Sep 6, 2017
  9. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    Copy that...160K.
     
  10. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    Sorry to bug you gents again, but would you please tell me what value are in the slots for Rm85 & 86? Also, Rm89 & 90 call for 4.3K, but I've got 3.9K. Thx mucho!
     
  11. gort69

    gort69 AK Subscriber Subscriber

    Messages:
    828
    Location:
    Vancouver, WA
    85, 86 brown blue red gold 1.6k

    89, 90 orange white red gold 3.9k
     
  12. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    Thanks!
     
  13. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    A bit more help from anyone with the hood up on one of these purdy please...can you tell me what's in:

    R1&2, R5&6, R7&8, R21-24, R33-36, R31&32, R49&50

    Sorry for the hassle y'all, but I replaced all the aforementioned before I figured out the previous R25-40 anomaly. Ugh. :(
     
  14. hopjohn

    hopjohn Kenwood Krazy Subscriber

    Messages:
    931
    Location:
    Dallas, TX
    Didn't have time to check what resistors ID's were which so if it doesn't give you what you need let me know.

    [​IMG]

    [​IMG]
    [​IMG]
    [​IMG]

    [​IMG]

    [​IMG]
    [​IMG]
     
    rjsalvi likes this.
  15. petehall347

    petehall347 the brandy coffee man

    Messages:
    23,804
    Location:
    uk.. the middle bit
    i wouldn't worry if all original . things got changed earlier on with most stuff ..unless of course you are upgrading .. something i would never consider .
     
  16. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    You rock, hopjohn!
     
  17. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    Well, I'm done with the "upgrade" and all the old resistors are sitting in a paper cup, which makes it difficult for me to reconcile board vs. schematic after the fact...an "oh sh*t" moment. Fortunately for me, I've had those moments before so it's easy to get it under control (loud sneeze that sounds like I'm saying bullsh*t).
     
  18. petehall347

    petehall347 the brandy coffee man

    Messages:
    23,804
    Location:
    uk.. the middle bit
    ah i see what you did now .i did wonder .. hoping it all works out for the best .
     
  19. rjsalvi

    rjsalvi Active Member

    Messages:
    316
    Location:
    San Diego, CA
    It appears that there are a few more values that I did NOT change which differ from the schematic, but it looks like the rest of my upgrades are good.
     
  20. hopjohn

    hopjohn Kenwood Krazy Subscriber

    Messages:
    931
    Location:
    Dallas, TX
    Sounds like you got a handle on it. Glad I could help.
     
    rjsalvi likes this.

Share This Page