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  1. #1
    Join Date
    Jun 2011
    Posts
    13

    Question Galil DMC-2143 - Red LED

    Hi everyone!

    I mistakenly applied 10.7V to the pin 63 (Reset) instead of sinking it to 0 (zero) volt, for a split second. Now the red LED is ON all the time and I can no longer communicate with the board. However it still has the same voltage reading that it used to have on all the 96 pins, except the X, Y, Z & W Amp Enable. Which makes sense: If there is a fault, all the axes should be disabled...

    The reset pin goes straight to the IC U35 (see attached picture). Could anybody help me find this IC? It is smaller than a grain of rice and appears to be made by Texas Instruments. Since I overpower it, I will replace it first and go from there!

    Any help will be greatly appreciated!
    Luiz
    Attached Thumbnails Attached Thumbnails U35 (70750 5CT C7LF).JPG  

  2. #2
    Join Date
    Dec 2003
    Posts
    24216
    Check out MAX708 micro version.
    http://datasheets.maxim-ic.com/en/ds/MAX705-MAX813L.pdf
    I have Galil boards that use the same IC and the schematic show the external reset going to this IC.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  3. #3
    Join Date
    Jun 2011
    Posts
    13

    DMC-2143 U35

    Quote Originally Posted by Al_The_Man View Post
    Check out MAX708 micro version.
    http://datasheets.maxim-ic.com/en/ds/MAX705-MAX813L.pdf
    I have Galil boards that use the same IC and the schematic show the external reset going to this IC.
    Al.
    I downloaded their PDF! Is it a direct replacement for the ...C7LF...? How did you figured that?! The card works without it! If it has no other function, I will just leave it like it is!

    Could you please sent me a copy of the schematics (Preferable DMC-2143), or let me know how I can get one?

    Thanks a lot!!!
    Luiz

  4. #4
    Join Date
    Dec 2003
    Posts
    24216
    The schematic is for an older ISA card so it won't relate to the 2143, the card had the identical IC and the print was marked MAX708.
    It only shows two connections to the chip, I can copy the page if you want.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  5. #5
    Join Date
    Jun 2011
    Posts
    13
    Quote Originally Posted by Al_The_Man View Post
    The schematic is for an older ISA card so it won't relate to the 2143, the card had the identical IC and the print was marked MAX708.
    It only shows two connections to the chip, I can copy the page if you want.
    Al.
    Sure! Please send me a copy!

    By what I've seen on the board, one track goes to the pin 63 and another one goes to the GL-1800. I couldn't tell if there are any other connections...

    Thank you!

  6. #6
    Join Date
    Dec 2003
    Posts
    24216
    PDF of MAX708 U2
    Al.
    Attached Files Attached Files
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  7. #7
    Join Date
    Dec 2003
    Posts
    24216
    I reposted the PDF after I realized I had cut some of the copy off.
    Al.
    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.

  8. #8
    Join Date
    Jun 2011
    Posts
    13

    Re: Galil DMC-2143 - Red LED

    Al_The_Man, I haven't posted in years, and I just came across this thread, and I am sorry that it took so long for me to thank you! I did replace that IC long time ago and it worked! Thank you so much!
    https://www.youtube.com/watch?v=EeMsZmbrl98

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