HAAS TL_3 varistor codes


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    Default HAAS TL_3 varistor codes

    Hi,
    I need all varistors code for change, please. The first for right position is fire and i can´t read the correct numbers.
    Regards,
    Alain

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    Attached Thumbnails Attached Thumbnails HAAS TL_3 varistor codes-varistor-haas-tl3-jpg  
    Last edited by alain aleman; 11-23-2017 at 06:12 PM.


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    Default Re: HAAS TL_3 varistor codes

    as no one with a HAAS TL_3 has replied

    do you have the maintenance manual with the circuit diagrams showing the connections to the varistors ??


    going by your photo it looks like you have
    EPCOS S20 K250 in positions VR1 & VR4
    and what looks like
    S20 K460 in positions VR2 , VR3, VR5 and VR6

    PDF EPCOS data sheet :-

    HAAS TL_3 varistor codes-s20-k250-s20-k460-datasheet-pdf

    after a quick web search
    in the UK , http://uk.farnell.com has them

    http://uk.farnell.com/epcos/b72220s0...ngdom%2Fsearch

    in the US
    Mouser Electronics
    https://www2.mouser.com/Search/Refin...yword=s20+k460

    John



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    Default Re: HAAS TL_3 varistor codes

    Thank you so mucho my friend, is correct.
    Regards,
    Alain



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    Default Re: HAAS TL_3 varistor codes

    Hi John,
    I was looking the board and the order varistor is not the same. Attached the diagram.

    Attached Thumbnails Attached Thumbnails HAAS TL_3 varistor codes-varistor-diagram-tl-3-2005-jpg  


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    Default Re: HAAS TL_3 varistor codes

    Hi Alain

    obviously the photo did not show me enough detail !!!


    I have had a look at the HAAS web site but they don't appear to make the circuit details of the PCB's available


    assuming no other damage has been done ( like fuses or PCB tracks blown )

    I would expect you will measure about

    230 to 240 V AC across the S20 K250 varistors

    and 420 to 440V AC across the S20 K460 varistors

    so you should be able to workout what device was destroyed

    by measuring across the PCB terminals


    the S20 indicates the varistor's diameter

    and the 3 digits after the K is the Max. AC operating voltage


    what does the under side of the burnt terminals look like ??

    be care full removing the wire ends not to pull out the Via's (plated through holes)
    or peel the copper tracks of the board



    John

    Last edited by john-100; 11-24-2017 at 12:59 PM. Reason: add ref to vias


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