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Snap-On MT2261 timing light

Discussion in 'Electronic Repair' started by Franc Zabkar, Jan 4, 2007.

  1. Franc Zabkar

    Franc Zabkar Guest

    I'm relating the following experience to show how information held by
    the US patent office helped me with a repair.

    I recently repaired a Snap-On MT2261 timing light with an intermittent
    flash problem. As expected, Snap-On were not able to provide circuit
    diagrams, or a service manual. Their quoted price for a replacement
    circuit board was AU$900 which was more than the cost of a new unit.

    However, I noticed that on the ratings sticker there was a reference
    to two US patent numbers. Sure enough, a search at the US patent
    office turned up a document
    (http://patimg1.uspto.gov/.piw?Docid=04713617) with a circuit diagram
    and an in-depth functional description, including a detailed flowchart
    for the firmware.

    BTW, the fault was a 0.033uF HV ceramic cap connected to the low
    voltage winding of the trigger transformer. I replaced it with a 2kV
    pulse rated polypropylene cap. Because of its size, I had to relocate
    the replacement cap and attach it with 300V fly leads. Incidentally,
    the original ceramic cap tested OK on a cap meter. I confirmed that it
    was faulty by reinstalling it and reproducing the original problem.

    PS. The following site provided the document in a more convenient
    format (a 20-page .pdf file), but required me to register (for free).

    http://www.freepatentsonline.com/4713617.html

    - Franc Zabkar
     
  2. Guest

    GREAT IDEA!

    H. R. Hofmann
     
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