I've got a Dinotte AA tail light which has just failed. I had to replace the battery connector, and in the process noticed that one of the 220uF surface mount capacitors had fallen off of the PCB. Oddly enough the light still seemed to work.
Famous last words.
I'm not sure what function that electrolytic had, but it looks like it was important. The light functions as it used to (ie power on self test causes low power status LEDs to flash) but the main LED doesn't illuminate.
So, my questions are (i) What does the 220uF capacitor do, that not having it apparently causes the emitter to fry (ii) Am I correct in thinking that the emitter is a red Seoul Z-Power P4 (iii) Where can I get one from to replace it!
Measuring the voltage across the emitter, it seems to be around 5.6v which seems high, but may just be because the emitter has died and is open circuit and the drive circuitry is unloaded.
Famous last words.
I'm not sure what function that electrolytic had, but it looks like it was important. The light functions as it used to (ie power on self test causes low power status LEDs to flash) but the main LED doesn't illuminate.
So, my questions are (i) What does the 220uF capacitor do, that not having it apparently causes the emitter to fry (ii) Am I correct in thinking that the emitter is a red Seoul Z-Power P4 (iii) Where can I get one from to replace it!
Measuring the voltage across the emitter, it seems to be around 5.6v which seems high, but may just be because the emitter has died and is open circuit and the drive circuitry is unloaded.
