Workshop tales, trials and disasters.
Maintenance tips, techniques and myths.
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10 posts • Page 1 of 1
I have a Busch + Müller Toplight Line Plus LED the stand light recently stopped working. After I turned the bike upside down and did a clean with a hose ...
long shot but, anyone had this and fixed it? replacing capacitor or something similar?
Oops. Fortunately the circuit is reportedly very simple
That posts lists the components as
R1 220 Ohm R2 100 Ohm
C1 1 F, 5.5V
D1, D2, D3 1N4001 etc
Rectifier B80 1500R etc
LED1, LED2, LED3 superbright LED, 3000 mcd, 5 mm, ca. 1.6v, 20 mA
Am I right in thinking that each of the LEDs in the tail light still work, it is just the standlight that has stopped ? If so the capacitor looks likely. A 1F 5.5V capacitor is pretty easy to get hold of, eg jaycar or RS-online. Each of these are about 20mm in diameter x 6mm thick, so you would need to check the dimensions of the part you are replacing to make sure it will fit.
thanks find_bruce, I was not really expecting any replies . Not really very electronic-y myself, but i think I know enough to unsolder and re-solder.
i think all the leds are still working, I'll check that later tonight. ill probably get to it on the weekend and post back.
warning for everyone: dont wash your bike!!! first time i wash the bike in years and this happens. haha
Just use baby wipes, a rag and mr sheen. No need to use water to wash the bike
Washing is fine, just keep the bike upright and don't spray from underneath. It's the "upside down" bit that has probably caused the problems. All the B&M literature (certainly for the headlights) states that the lights are not waterproof but designed to be rain-proof, and not to mount them upside down.
Riding bikes in traffic - what seems dangerous is usually safe; what seems safe is often more dangerous.
Sometimes you just get lucky - I have been reading way too much lately about standlight circuits & had come across that pic.
If it were me, the thing I would be checking first is that I hadn't switched the standlight off, but I am sure a smart bloke like you has already checked that
Does it have the coin cell (cache) battery, replaceable?
not sure about the battery.
So i get home tonight and the standlight is working !!!
so maybe water short circuiting the capacitor, draining its charge ... and now the water is gone, its working?
wandering if its worth opening up to have a poke or just leave it alone now.
The most productive task remaining is to change the word "stopped" in the thread title to "restarted". Lucky. Unlike phones dropped in water which have a battery that keeps supplying power to keep electrolysis happening, the standlight capacitor's charge is depleted relatively quickly
2014 goal 52000m
leaving as is, decided fiddling was asking for trouble. Quick check most times i stop now.
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