- you will need a battery with wires attached (or in battery holder) so you could connect it to a driver quickly without having to reassemble the flashlight.
- then cycle through modes and leave the flashlight in strobo (anything except SOS mode)
- disconnect the battery
- take a short wire like paper clip (which you, ofcourse prepared prior to experiment ) and short circuit that capacitor, you can do that 2-3 times just to be sure
- then again connect the battery and inspect in which mode will flashlight start :) it should be HIGH, if that is the case you can add resistor on top of the capacitor and make it discharge faster (forget mode faster)
*(try to do this experiment as fast as you can, if you can do it in less than 10 second that would be great)
I don't have this driver and therefore I cannot tell you if changing R2 would do the same thing.
This evening I was willing to mod the driver, plugged in the soldering iron and just in the meantime took a good magnifiing lens and a small flashlight to look at those tiny components.
R2 looks like has no numbers at all printed on it when looking by bare eyes, but upon closer inspection leaning the light side to side, I was able to see some very small lettering, looks like fine carving, not painted. There's a line side to side toward one leg, and "4S" in the middle. This lead me to think DrJones was right and that R2 actually is a diode.
(why then printing R for the diode? R for resistors, C for capacitors, D for diodes, S for schottky, no? Buh...)
Anyway, just for testing, removing that R2 diode results in disabling the modes, and light works in low only. Not very useful.
Going to add a resistor on top of the capacitor now (wish me all good, I'd never ever soldered something so tiny before!)
Soldered a 1912 (19K, correct?) resistor on top of C1. It's the only resistor above 1K I got around, removed from a dead nanjg105.
I got lucky and now the East92 has a super-short memory wipe: quickly tap with the finger in less than half second, and it changes modes. Wait just a little bit more, less than 1 second, and it's always on high!
I love it now! So much that the planned driver swap with a nanjg (ready in case I fu**ed the east92) is not a priority anymore.
And the satisfaction of having soldered those damn tiny components is a great reward too. You should have seen (and heard...) me when in the process of placing the resistor in the right spot, it suddenly jumped off the board falling on the floor, literally covered with metal shavings and plastic dust (it's the same place I also have maintenance for RC models)
10 funny minutes spent in close examination of any dust with flashlight and tweezers...
Well done Rockspider. Perseverance has paid off. Your floor sounds a little like mine. Do you think you would have a go at the low voltage drivers I have tested with next mode memory?