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Circuit Boards

Discussion in 'Integrated Machine Control' started by John C., Oct 7, 2021.

  1. John C.

    John C. Senior Member

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    That confirms what I was told. When I studied the traces I see that in the non-energized condition there are no connections to anything. When energized two circuits on each side are connected. When I power up the board the relay is energized and an alarm is going sounding. Since I could only get a relay to cover the one side I just joined the other side with copper wires so that they were on all the time. I'm guessing now that relay is some sort of inhibit as the wire side traces got down to an IC. When I'm up there again I'm going to cut the wires to sever the connection to that IC and see what happens. I'm thinking the worst that could happen is the alarm shuts off. I'll post what I find.

    Thanks again!
     
  2. John C.

    John C. Senior Member

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    When I was up there yesterday I took some photos of the machine to maybe help people understand the issues. It doesn't just drill a hole in the rocks. There is a wedge device that can rotate into the position of the drifter and be moved into the hole. There is a wedge in between to pieces of steel that is pushed down forcing the steel halves apart hopefully splitting the rock.

    IMG_5064.jpg

    IMG_5071.jpg

    IMG_5072.jpg
     
  3. John C.

    John C. Senior Member

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    Here is the wiring in the control panel that hooks up to the circuit boards.

    IMG_5067.jpg

    And here is the control panel.

    IMG_5066.jpg

    The compressor and dust collection systems are installed where the counterweight would be.

    IMG_5070.jpg
     
  4. John C.

    John C. Senior Member

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    This machine has an extra pump installed that I have never seen done on a Komatsu before.

    IMG_5069.jpg

    There is an extra set of control solenoids mounted on the drill mast.

    IMG_5065.jpg

    It all runs off those two integrated circuit panels.
     
  5. John C.

    John C. Senior Member

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    I cut out the wires that I put in to take the place of that big relay and I got all the systems working in manual mode now. I suspect something is amiss either in one of the three ICs or I have a bad wire somewhere. The LED #4 stays on all the time and I can't get the air solenoids up on the mast to open up. There is a cannon plug on the machine txt the retaining ring is stuck on and I can't get it to unscrew so I can check the connections. I'll bring some bigger tools to loosen it next time I'm up there. I did remove the boards again, hopefully for the last time to take some photos with a light behind to show the traces. These are a little bigger fines for more detail. The first is the bottom board basically looking down on it.

    IMG_5077.jpg
     

    Attached Files:

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  6. John C.

    John C. Senior Member

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    Here is the top board doing the same thing plus turned over.

    IMG_5079.jpg IMG_5080.jpg
     
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