I'm in America and I have the same old charger, but mine is lacking the piece that blew in this one. You should do a video on cleaning this thing up for someone to use as a small psu, if thats even possible. I love playing around with ac/dc converters for some weird reason. It started a few years ago when I decided I wasn't spending a fortune on a good home audio set up, and built my own with car audio equipment/12vdc, and so I had to figure out how to spark that up. Trial and error, few pops and close calls but still here lol.
How do you replace a fuse in a 18 volt hitachi charger , no light at all Thank Can you do a continuity test on the fuse to see if it’s bad. And how do you replace a fuse Thanks
I'll have to see if I can get access to the charger to open it up again, although as it is a switch mode power supply, you'll also need to know number of turns of each winding, wire gauge, bobbin size and type, and the permeability of the core. It's probably easiest to unwind your transformer and count the turns and rewind it the same with the same thickness wires. It is most probably purpose built so you won't find a replacement for sale anywhere.
Best way would be with a step-down transformer without reverse engineering the circuit to see if it can handle 240V. At the very least, you'll need to replace MOV's, capacitors, etc to handle the higher voltage, but if it was never intended for 240V use, it could need a complete redesign.
I have the same charger, except 240v UK model - it stopped charging for no apparent reason but has not suffered the issues as described in this video...it did have some darkened witness marks on the other side of the heat sink around transistors at R5/6/7 - I replaced them all like for like but still no joy, are there any other common faults associated with this charger?
maybe the rectfying diodes had a short circuit, it usually happens when you plug PSUs in wrong voltage outlets, also, the switching mosfet of the primary or the schottky diode of the secondary might be blown off
