Standlights stopped working

Discussion in 'UK and Europe' started by King Pineapple, Feb 13, 2003.

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  1. Suddenly both front and rear standlights on my bike have stopped working. (I'm not sure if that is
    the right term in English - called Standlichts in German - the little diodes that stay on with
    dynamo lights when you stop pedalling). Anyway, does anybody know what the problem could be? It
    happened once before and I think it is something to do with incorrect polarity or earthing, but
    although I fixed it last time I can no longer remember what I did! Any suggestions appreciated.
     
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  2. On Thu, 13 Feb 2003 19:01:22 +0100, contributor King Pineapple had scribed:
    > Suddenly both front and rear standlights on my bike have stopped working. (I'm not sure if that is
    > the right term in English - called Standlichts in German - the little diodes that stay on with
    > dynamo lights when you stop pedalling). Anyway, does anybody know what the problem could be? It
    > happened once before and I think it is something to do with incorrect polarity or earthing, but
    > although I fixed it last time I can no longer remember what I did! Any suggestions appreciated.
    >

    When were they previously used, if it is more than a week then the condenser takes a little longer
    to provide the necessary power to the LEDs as power is drawn into the condenser. Does the front
    light incandescent bulb light up when you start to move? If so it is likely to be as suggested, if
    not check all wiring there is likely to be a break somewhere.

    Gary

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    The email address is for newsgroups purposes only and therefore unlikely to be read.

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  3. Thu, 03 Apr 2003 12:21:14 +0100, Gary Knighton:

    >On Thu, 13 Feb 2003 19:01:22 +0100, contributor King Pineapple had scribed:
    >> Suddenly both front and rear standlights on my bike have stopped working. (I'm not sure if that
    >> is the right term in English - called Standlichts in German - the little diodes that stay on with
    >> dynamo lights when you stop pedalling). Anyway, does anybody know what the problem could be?

    I presume the halogen bulb is old (> 60 hours of use) an neighboured windings of the filament are
    welded together. This caused the resistance of the bulb to decrease.

    Usual dynamos behave like current sources (current won't exceed 550 mA). With a lower resistance of
    the headlamp bulb the voltage of the whole light system is lower then it should be. With enough
    welds in the bulb the voltage might decrease from 6.0-6.5 Volt down to lower than 5 Volt even at
    high speed. What might not be noticed from the headlamp beam is easily noticed from the Standlights:
    With voltages lower than 4.5 Volt the capacitor(s) won't be charged!

    Solution: Use a new halogen bulb! Mount the headlamp where it gets the least vibration - especially
    NOT at the unsuspended part of suspension fork.

    If you like to experiment: Compare the filaments of the old and the new bulb under a stron
    magnifying glass and measure the voltage when supplied with 400mA (increase the current slowly from
    lower values).

    Andreas (just had the same diagnosis on a friends bike this morning)
     
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