Charger for a mobility scooter. One charger not working, I opened it up
and as per image below it looks like some kind of fuse has blown.
Text on the board looks like 3A/2500AR.
Can anyone confirm and identify what I would need to replace.
I have limitations on electronic stuff but could probably manage to
solder this part if I can find a replacement.
We might, of course, wonder why it has failed so catastrophically.
Before spending a lot of time sourcing a fuse and doing a repair, I
would be inclined to pop an ammeter with a reasonably high range across
the location. Even cheap DVMs normally have an internal fuse which
should protect them if (say) there is now mains across the two sides.
I cannot see the picture, but is it a switch mode device or a good old
If the latter the most common fault is the bridge rectifiers which are
commonly under specified for spikes in current etc.
If its swwitch mode then it might be possible to get a new module, but I've
seenin the past that companies have cut costs by fitting a soldered in fuse
as of course they never blow do they? :-)
Is the company that made the device still around?
This newsgroup posting comes to you directly from...
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.
Fairly academic really.
The state of the fuse suggests that someone needing advice on how to
identify an antisurge fuse, would not be in a good position to find
the fault that caused that problem.
The only hope is that the event was caused by a spike initiating a
crowbar, or a "self healing" suppression cap, tranzorb etc.
A slim chance methinks!
On Wed, 31 Jan 2018 11:34:40 -0800 (PST), firstname.lastname@example.org wrote:
The replacement almost certainly wont work.
Trying to solder directly to the end caps of a 20mm glass fuse is
difficult, unless the mp of solder has changed a lot.
The current taking the thing out would be quite impressive.
Without going in to the detail as I covered in a previous post the
scooter was FILs and he had an uncanny knack of just looking at
something and it broke,,,mobiles,computers, hearing aids, TV, set the
microwave on fire, he would pull plugs out of sockets by the cable, he
was a nightmare.
Anyhow his scooter has 2 chargers, 1 he lost the fuse (ordered ebay) and
the other (this one) who knows what he done. I have replaced the
batteries in the scooter and it works good and I will be selling it
locally for just above what it costs to get it all going, if I need to
buy another charger so be it but if I can keep the cost down its a
better buy for some old buddy.
So if I replace a fuse and it blows the charger I aint too bothered, I
just need to know what I am looking to replace.
On Wed, 31 Jan 2018 22:56:11 +0100, Thomas Prufer
... and the photo shows a NTC. Those are sometimes used as an inrush current
limiter. Switching the charger on and off frequently in a short time can defeat
the NTC, causing the fuse to blow.
Replace the fuse, and see!
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