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IndustryArena Forum > MetalWorking Machines > Uncategorised MetalWorking Machines > Vertical Mill, Lathe Project Log > Leadwell MCV 550 with a Fanuc 10MA control small c error on master PCB
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  1. #1
    Join Date
    Aug 2008
    Posts
    8

    Leadwell MCV 550 with a Fanuc 10MA control small c error on master PCB

    small c error on master PCB after short circuit of 24 volt input switch power
    I have a problem with a leadwell MCV 550 with a fanuc 10MA control. In order to repair this problem(or part of the problem), I need to know the proper value of a burnt out resistor on one of the circuit boards. The A20B-1000-0800 circuit board on the side of the CRT and also connected to the pulse encoder wheel has a connector CA3 above which are 2 light blue 1 watt resistors mounted horizontally. The one on the right side was burnt out and is Attachment 300886Attachment 300888 removed. Could someone please read the ohms value off that resistor RA10? The one beside it on the left is 1.0K. Above the leftside one of three blue connectors(CA3) is where we're looking.
    FYI The machine was still working, but only if warmed up a long time in the small c error condition on master PCB.

  2. #2
    Join Date
    Aug 2008
    Posts
    8

    Re: Leadwell MCV 550 with a Fanuc 10MA control small c error on master PCB

    The resistor is now replaced, but there is a problem with the 5 volts feeding the TTL logic on the board. It takes 20 min to ramp up to 5 volts. I guess the power supply board behind it is sick(and not too cheap either).

  3. #3
    Join Date
    Aug 2008
    Posts
    8

    Re: Leadwell MCV 550 with a Fanuc 10MA control small c error on master PCB

    Problem solved by swapping in a new fanuc power supply board.
    My thanks to the full service machine tool guys at Billor Machine Tool Service out of Irving Texas. Quick and effective.

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