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Snap-On MT2261 timing light

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

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  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
    ( 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).

    - Franc Zabkar
  2. Guest


    H. R. Hofmann
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