Method and apparatus for diagnosing and repairing faults in a series-connected lamp string

A first method for determining which lamp assemblies in an energized substantially series-connected lamp assembly string, hereafter referred to as a lamp string, are faulty by

• a. attaching a first electrically-conductive insulation-penetrating means, hereafter referred to as probe 1, to the left-most wire of said lamp string, then
• b. attaching a second electrically-conductive insulation-penetrating means, hereafter referred to as probe 2, to the approximate center of said lamp string, said probe 1 and said probe 2 being electrically communicative and
• c. observing if any part of said lamp string illuminates, in which case said probe 2 is moved leftward approximately one half the number of lamps between the current connection point of said probe 2 and the extreme left end of said lamp string, or any prior connection position of said probe 2, whichever is fewer and
• d. noting if such movement is not possible, a faulty lamp assembly lies immediately to the left of the current connection point of said probe 2 in which case said probe 2 is disconnected and the faulty lamp assembly replaced with a known good lamp assembly whereupon If all lamps in said lamp string now illuminate, the process is complete, otherwise If all lamps in said lamp string do not illuminate, going to step b, but If movement is possible, then going to c,
• e. noting however if in c, no lamps in said lamp string illuminate, then said probe 2 is moved rightward approximately one half the number of lamp assemblies between the current connection point of said probe 2 and the rightmost connection point of said lamp string, or any prior connection position of said probe 2, whichever is fewer,
• f. observing if such a move is not possible, the faulty lamp assembly lies immediately to the right of the current connection point of said probe 2 whereupon said probe 2 is disconnected and the faulty lamp assembly replaced with a known good lamp assembly and if this action results in all lamps in said lamp string illuminating, the process is complete, otherwise, going to b, although If movement is possible, then going to c.

A second method for determining which lamp assemblies in an energized substantially series-connected lamp assembly string, hereafter referred to as a lamp string, are faulty by

• a. attaching a first electrically-conductive insulation-penetrating means, hereafter referred to as probe 1, to the left-most wire of said lamp string, then
• b. attaching a second electrically-conductive insulation-penetrating means, hereafter referred to as probe 2, to the left terminal of the rightmost lamp assembly of said lamp string, said probe 1 and said probe 2 being electrically communicative and
• c. observing if any part of said lamp string illuminates, in which case
• d. moving said probe 2 leftward one lamp position without connecting to the leftmost wire of said lamp string and returning to c, unless such a move is not possible, in which case a faulty lamp assembly is located immediately to the left of the current connection position of said probe 2 and said probe 2 is disconnected and the faulty lamp assembly is replaced with a known good lamp assembly which If all lamps in said lamp string illuminate, the process is complete, otherwise going to b,
• e. observing however in c, if no lamps are illuminated, the faulty lamp assembly lies immediately to the right of the current connection point of said probe 2 and the faulty lamp assembly is replaced with a known good lamp assembly whereupon If any lamps in said lamp string illuminate, said probe 2 is disconnected and if all lamps in said lamp string are illuminated, the process is complete, otherwise going to d.