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Thread: takamine acoustic electrics issue cp-132sc

  1. #1
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    takamine acoustic electrics issue cp-132sc

    Morning

    I don't normally touch this sort of thing, But a local guitar shop that i do repairs for asked a favour as they brought it working then it failed
    sam_4907.jpg
    This acoustic has low output. Not pickup or battery. Injected a signal and i can see it til it gets to i ic called 4062
    This unit has 3 ic all with different numbers on
    signal seems to get going into pin 1 and 2
    any assistance ??

    have a good day people

  2. #2
    Supporting Member Jazz P Bass's Avatar
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    What you see are two different opamps.
    UPC4572
    ADA4062

    The pinouts are standard opamp configuration.

    Pin 1 output A
    Pin 2&3 Input A
    Pin 4 -V
    Pin 4&5 Input B
    Pin 7 Output B
    Pin 8 +V

  3. #3
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    thanks jazz bass. I did look at the ada4062 but pin 1 and 2 are connected together via track ( can see in the picture ) and ive tested with dmm. when i checked the net for pin out on a ada4062 i noticed the 1-2 are input and output so this lead me to believe that it wasn't an ada4062.

    will check tomorrow again

  4. #4
    g1
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    An op-amp with input connected to output is a standard unity gain buffer:
    voltage-follower.png
    Attached Thumbnails Attached Thumbnails 230px-op-amp_unity-gain_buffer.svg.png  
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  5. #5
    Senior Member Enzo's Avatar
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    Op amps have two inputs, an inverting one and a non-inverting one. It is very common for one input to tie to the output.


    Edit: g1 beat me to it.
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    Education is what you're left with after you have forgotten what you have learned.

  6. #6
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    Many thanks
    Ive learnt something new today

  7. #7
    Supporting Member Jazz P Bass's Avatar
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    Here are three circuits that I pulled off of the ADA4062 datasheet.
    Attached Files Attached Files
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  8. #8
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    here's a couple links with info on the Accuracoustic preamp with schems.

    I don't know why they used these crappy electrolytics for signal coupling except for space as they tend to fail, like the one I'm working on.



    https://www.musiker-board.de/threads...esucht.399060/


    Yustech GT-Guitars and Basses Solution.: Takamine AccurAcoustic Preamp Issues Part II
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  9. #9
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    I've fixed plenty Takemine preamps due to leaking electrolytics. The problem is not tied down to one particular version, either. Often they're so bad the tracks have corroded away. Even more difficult is those that are positioned between sliders and difficult to reach. I've been replacing the low-value electrolytics with Tantalum for the past 5 years and they're holding up fine.

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