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  1. #1
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    Jan 2014
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    2

    Heidenhain TNC 124 service manual needed

    Gentlemen,

    I am trying to repair an old TNC 124 control unit. It powers up with a overheat error.

    Somebody replaced the fan under the control PCB (perhaps maintenance) and did not fix the problem.

    I am looking for the thermal measuring circuit.

    Thank You

  2. #2
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    Jan 2014
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    2
    I was able to repair this unit, the repair folks at Heidenhain explained that the unit was no longer repairable, but gave me a few tips, It came down to the power supply for the regulated -12 volt and -15 volt missing the supply B+. There are (3) 470 uf caps that leaked slightly on the PCB, and cause enough corrision to disconnect the supply from both regulators.

  3. #3
    Registered
    Join Date
    Dec 2017
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    3

    Re: Heidenhain TNC 124 service manual needed

    Gentlemen,

    I am trying to repair an old TNC 124 control unit. It powers up with a overheat error.

    Somebody replaced the fan under the control PCB (perhaps maintenance) and did not fix the problem.

    I am looking for the thermal measuring circuit.

    Thank You

  4. #4
    Registered
    Join Date
    Aug 2010
    Posts
    4
    Quote Originally Posted by MarcoCabezas View Post
    Gentlemen,

    I am trying to repair an old TNC 124 control unit. It powers up with a overheat error.

    Somebody replaced the fan under the control PCB (perhaps maintenance) and did not fix the problem.

    I am looking for the thermal measuring circuit.

    Thank You
    Hi Marco
    I’m also looking for the service manual and the software PLC.exe and PLCmon.exe for the TNC 124.
    Did you have any luck.
    Please share the link if possible.
    Thanks.

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