No problem with that it will be at the end of a long extension lead out the back garden.
As for the 3A fuse, looking at the remains of the old one would I be correct in saying it was in the form of an upside down U shape, as I see there are 2 points of damage, the remains of a glass fuse and then the longish wire with just a cap on it, I presume these were connected at one point and I basically bridge that gap with the fuse.
and now you do.
NT
Yes.
And they would have looked like this:
Cheers, T i m
Thanks Tim, I will get a couple of ebay as they will be easier to solder on to the board.
Hopefully final question :-)
Would it be a fast blow or slow blow fuse?
ss used his keyboard to write :
From what I can see in the image, it looks like a wire ended fuse which has exploded. That suggests a serious fault.
Also from what I can see, it looks like a fairly crude charger. transformer, bridge, then possibly a relay switching the charge current on and off, driven by a basic voltage across the battery sensing circuit.
I expect it is into a transformer and a chunky PSU capacitor so a fast blow might well go pop just from the inrush current on a bad day.
Be aware that fuses don't usually go bang that spectacularly unless there is a major fault (as in dead short somewhere).
The picture only shows a section of the board- 4 diodes (presumably a bridge rectifier), and what looks like a space for a PCB fuseholder with a soldered-in fuse in it's place that looks like it has exploded.
Could it be that if the batteries on the scooter were goosed that the charger was trying to draw too much power and blew the fuse?
ss has brought this to us :
Quite possible. You might not be able to source a 3A fuse, a 3.15A will be fine, try it without being connected to the batteries to see if it still blows.
very unlikely. The huge current required to do that must have come from the batteries, the charger would not be able to supply it.
NT
Chris Bartram expressed precisely :
Which certainly would happen, if the batteries were connected in reverse.
ss presented the following explanation :
It looks as if the wire ended fuse was mounted vertically, with the upper wire folded over and back down to the PCB. Often they design PCB's with component options. In this case it looks as if it might have been designed for a fuseholder, but to save a few pennies they used a wire ended fuse direct to the PCB.
Maybe I am thinking the wrong way, my thinking is saying that the charger may have been trying to draw more power from the mains to charge what were effectively dead batteries.
ss wrote on 01/02/2018 :
My guess would be a slow blow, to allow for the initial in rush surge.
I have ordered a fuse from ebay, Yes I will try that Harry as it may well be something on the scooter that is at fault although I doubt that as the scooter was being used until the batteries failed, who knows.
The scooter itself works ok as I replaced with new batteries.
Which would be why the fuse blew?
Any charger that blew itself to bits by gross overload when connected to a flat battery would be dangerous & illegal. I've seen many illegal & unsafe chargers, but nothing that bad.
NT
If it's on the mains side, 3A is high enough not to need to be slow blow. If on the low side, there is no need for slow blow. Thus it will have been a cheaper F3A fuse.
NT
do you not have a 3A mains plug fuse?
that can't be the cause
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