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converting a pcb to schematic.

Discussion in 'Electronic Components' started by roy, Aug 23, 2010.

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  1. roy

    roy Guest

    I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
    other has 3 ic, and several transistors along with various resistors,
    diodes and capacitors. I need to obtain the circuit from the board
    inorder to troubleshoot it . It is used in a governor control.
    Is there any software or are there people who will convert it to schematic
    for a price ??? If there is software that can convert it at least (very
    basic conversion) to a schematic, it would really help. Its very difficult
    doing it physically as the printed circuit is double sided though not very
    complex. I have clear photographs of both sides of the boards.

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  2. ian field

    ian field Guest


    First of all sketch the component side and itemise all the components and
    their values.

    I find it helps to scribe the component symbols on the solder side with a
    sharp pointed knife (scalpel).

    You will reach a point where the evolving schematic is beginning to make
    sense but the finer details of the tracks are getting harder to follow.

    Now is the time to start carefully removing components so you can trace
    point to point with a DMM on low Ohms range.

    As long as you document each stage you shouldn't have any problem putting it
    back together.
     
  3. A good alternative to removing components to follow the tracks behind them
    on a double ou multilayer board is simply... to Xray the populated PCB ;+).
    Just ask it as a favor to your best doctor friend...
    Yours,
    Robert
     
  4. Eeyore

    Eeyore Guest

    Might be simpler to write software to convert Klingon to English !
    You'll have to do it 'by hand'.

    Suggest you start by identifying circuit 'nodes' and then placing the
    components as connected to them.

    Graham
     
  5. GregS

    GregS Guest


    Do a reverse image of one of the images, then overlay the two.
    You could use clear mylar. Laser machine does it well.

    I just usually do it the hard way, and also make use of a bright
    light on reverse side.

    greg
     
  6. Ross Herbert

    Ross Herbert Guest

    Not a possibility. You will need to do it "by hand".

    I have a similar problem in front of me right now only it is quite a bit more
    complex than your board sounds. Mine is a double layer board and many of the
    components cover tracks so you can't tell where they go visually. I either buzz
    them out or in some cases I revert to completely removing the component from the
    board in order to trace the tracks.

    You will also need to identify all of the components (IC's and other semis) and
    download their datasheets so that you can determine schematic connections and
    pin numbering. Your first efforts at drawing a schematic will be rather crude
    and you will need to check and double check the connections before arriving at a
    correct result. After sevewral iterations your schematic will eventually look
    like the original would have but it can take a day or 2 to get that far.


    :
    :I have 2 small pcbs about 3inches by 2 inches. One had 3 op amps and the
    :eek:ther has 3 ic, and several transistors along with various resistors,
    :diodes and capacitors. I need to obtain the circuit from the board
    :inorder to troubleshoot it . It is used in a governor control.
    :Is there any software or are there people who will convert it to schematic
    :for a price ??? If there is software that can convert it at least (very
    :basic conversion) to a schematic, it would really help. Its very difficult
    :doing it physically as the printed circuit is double sided though not very
    :complex. I have clear photographs of both sides of the boards.
    :
    :-------------------------------------
    :
    :
    :
    :
    :
    :##-----------------------------------------------##
    :Delivered via http://www.electrondepot.com/
    :Electronics Enthusiasts' Community of the Net
    :Web and RSS access to your favorite newsgroup -
    :sci.electronics.components - 22985 messages and counting!
    :##-----------------------------------------------##
     
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