(relaxing music)
- [Instructor] Okay,
so today, we're looking
at a Discovery 3 key.
This key is in a pretty terrible state.
The flip still works, unusually,
but what we've got here
is the buttons, one, two, and three
because the case is gone, the
actual buttons are destroyed
and have disappeared.
So we're gonna try and fix this key.
So, as you might have seen
before, this is the best thing
that's ever been invented
to undo keys, okay?
So, these are a set of circlet pliers.
You give it a squeeze, and the jaws open.
So, what we're gonna do,
we're gonna slide the pliers
into the space under the blade, okay?
And then just give it a firm squeeze.
Okay, so that was a bit
too firm, to be fair.
But that's okay, we got it open.
That's right.
Keep all the bits.
And here we have the circuit board,
and that's the main piece you need.
Okay, so if get to work on your key,
we've got an air gun here, you can see.
Put it on your key.
Heat comes out on the key
at the temperature you set on there.
That's what first thing you're gonna need.
Okay, so the other thing you need
is a decent soldering iron.
This is an old one now, but it works fine.
And two thing is you need to be able
to set temperature, and
you need to have a fine tip
on it so that you can
work on delicate switches.
Okay, so, we're using the heat gun now
to get the switch off.
If you try and do it
with a soldering iron,
you will damage the electronic circuit
or the bits around it, so don't do that.
It's all there, so I'm just gently
lifting up hold on the switch.
If it's ready to come,
it'll just come off.
And if it isn't, do not tug it too hard,
otherwise you'll just
tear the electronic track
on the circuit board,
and that's what the main problem we see.
There you go.
We're gonna remove the battery.
And just break open the tab, on there.
So lift it up, so that you've
got something to get ahold of,
then get a set of pliers or
grips, and just curl it round
in the direction away
from the end of the tab.
I can see now, so I'm gonna show us
that the leg is disconnected
from the battery.
And we can remove it
from the circuit board.
And the way we do that
is get hold of the leg
from the other side, like Simon's got,
and then heat up the leg.
You need a bit of patience here,
because if you try and
pull the leg too soon,
it will break the key.
And there you go.
So, the leg's come out,
and the hole that's come
out of there, at the moment,
is full of solder.
We're gonna get rid of that in a minute.
Okay, so the next thing is,
because we've disconnected one
of the legs, we're gonna
just pop the screwdriver
under the battery, pull it up,
and that's what might happen.
If the small leg's broken,
it'll look like that.
And that's why your battery on the key
doesn't charge up anymore and (mumbles).
However, what you might find,
is that this is still connected,
so that you have to
desolder it and remove it,
like we've done on the other
one, by gently pulling it.
Okay, the next thing is, we're going
to remove the battery holder just by,
just gently on these clips
because they break quite
easily if you don't.
So now, before you can fit
a new battery, you need
to remove all the solder from the holes
that it's gonna go into.
And that's really easy to do.
So the tab from the battery is still left
in the circuit board, okay,
and that's got to be removed
before you can fit a new battery.
Okay, so we're heating that leg up now,
and then when it's hot
enough, what we tend to do
is just kind of flick it out.
There we go, yes, so it's going now.
You can get hold of it
and move it away from the
hole, and it'll just be, yeah.
So it's off now.
So you can see on there, there's the leg.
It just comes off, and you're left
with a hole on the circuit board
that needs clearing out of solder.
Okay, so this is braid.
It's made out of copper, I think,
and it's used to remove solder from keys.
So, if you're gonna do it yourself,
you're gonna need some of this.
Otherwise, you're not
gonna get the solder out.
And all you do is you hold the
soldering iron over the hole,
just leave it there.
You can see there, the solder
is going into the wick.
The wick effect is taking the solder away.
And you're gonna be
left with an empty hole.
Fantastic.
Now you might need to turn it over
and just take a little bit
off from the other side.
On this small hole there
you can see there's still
a little bit of solder there.
So, let's just touch that side up.
Okay, so we now have three
places to put switches on,
on this Discovery 3 key.
And we're gonna have three switches.
These are the type you need.
That's what they should look like,
instead of little (mumbles)
because they were so broken.
And we're gonna show you how to do this.
It's a really delicate
little job, to be fair,
and it's a little bit frustrating.
And you've got to get
the four legs lined up,
and it's all a bit fiddly.
So, I would say, just
need to be a bit patient.
And it'll all go as planned.
So I'm just gonna use the heat gun now.
So warm it up a bit, okay.
But the problem is,
what you don't wanna do,
is melt the rubber button,
which is what can happen
if you put too much heat on it.
And also, if you're not
careful, blow it away.
Yeah, that's another thing.
If you have the heat gun too high,
it tends to blow all the
components all over the place.
So, you just gotta have a bit of patience.
Get it in the right place,
and it will, if you get it hot enough,
it will take the switch.
Okay, so we've got it in place now.
And we're just gonna
use the soldering iron.
And we're just gonna
touch up each of the legs.
Try not to get the soldering
iron on your finger,
because it hurts a lot.
And once you've done that,
just hold it in place for
a little while, that's it.
And same here.
And then hold the switch down afterwards.
Just while it cures.
Again, try not to get any
solder on any of the components.
And that looks like
you've done a good job.
Okay, and you see there,
two legs that side,
and the two legs that side.
Okay, so we're gonna put this
battery into this holder,
and then that's gonna
be attached to the key.
Now, with the battery holder,
you see you've got one big hole there,
and you've got one smaller hole there.
And, on here, you've got a
thick tab and a thin tab.
This is the one that normally
breaks, when it's in the key,
and that's why the key stopped working.
So, what you need to to
is just line the holes up,
with your new battery.
You can get your batteries on
eBay or anywhere you fancy.
And now, you can see that
you've got one leg sticking out
and one leg sticking out there.
Just make sure they're parallel
because when they go into the key,
they're going to need to line up.
Okay, so the next thing is
to get this fit into that
and it's quite straightforward to do.
You've got big tab that
goes in the big hole.
You've got a little tab, and
that goes in the little hole.
The best thing to do is
to line up the tab first,
the big one, that's the first thing.
Then, clip this tab over the
little bit it clips over.
Next thing is to make sure
that that little tab there
lines up with the little hole, okay?
I mean, you're happy it lines up.
You can just see it through there.
Just give it a gentle squeeze.
And then it will come through the hole,
and you can see it poking
through the hole there.
And then clip these over.
Now, the problem you've got
here is that if you leave
too much solder in these holes,
and you try and push these
tabs through the holes,
you will damage the key
and you won't be able
to fit this into here.
So you need to make sure
that all the solder is
gone from these holes.
Okay, so, we need to just
solder in these legs now.
You've got the solder, soldering iron,
a little bit of flux in there.
Don't need much.
Okay, so, that's one done.
And then the bigger one's gonna
take a little bit long, see.
Okay, so, there we have
both of them soldered.
Okay, so, we've put the battery
in and put new switches on.
And then we press the button.
The thing lights up there, which
means it's sending a signal
so that's good news.
Okay, so this is your
normal aftermarket case
that you get on eBay or Amazon.
So, the way we open these up is, again,
get these,
get these pliers, pop them in.
It'll just gently pop open,
nice and easy this time.
Okay, and so, if you can,
try and keep the key blade there.
You'll probably need to wind that around
because that's probably a bit loose, okay?
Okay, so if you open the
case and it all falls apart,
it's quite straightforward
to get back together.
First of all, you need this part here,
and it pops into this and
there's only one way it goes in.
And make sure it goes through,
and you know it's in the right position.
Then you need your spring,
okay, that goes on there.
And then you need to get your case
and this little bit of spring here,
locating the groove in there.
So you need to put that over there,
and then you need to think
about the way it winds.
So you want the key to flick
out that way, all right?
So you want to let go, flick it,
so therefore you need to
wind it the opposite way.
And I'll give it a couple of winds.
It's a bit tricky.
So just, okay?
So that's all wound up now.
Okay, so don't forget to put this in.
There's a little groove in there
that matches up with this here.
So just lay that there,
okay?
Next, you need to be putting
your circuit board in,
actually just locate nicely in there.
Okay?
Push that down.
And lastly, the cover goes on top.
And it should just all squeeze
together and flick out.
Now we put Super Glue in
these when we do them.
We haven't shown you how to
do that because you just need
to put a little bit around.
So just watch your
fingers when you do that.
Otherwise, it won't
stay together very well.
And that is that.
Okay, so you can either get the
blade cut from here to here.
That's what we do, obviously,
because we cut the keys.
But, you may want to take this out here
and put it into there.
And, if you do, you just
need to knock this pin out,
take this out, and then
you knock the pin out
of the other one and put it in.
You can sometimes find that
the attachment on this pin,
so the bit that goes
into there, is different.
And you might need to modify
that, but that's up to you.
Okay,
so, there you go.
We're just gonna cut the key.
And, with a three-button Discovery key,
you're good to go.
