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Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Here s how I changed the microswitch
on my 2 button flip style
key-fob.
Firstly here s a photo of it to show
you the type I mean. My car is a
2001 2L TS 156.
My key worked fine except for
the alarm/central locking
button.
Warning . Before attempting this work you need to be a fairly
competent solderer; the components are small and any solder splashes
could result in the key not operating - with the result that it won t start the
car (i.e. it won t be recognised). Read through this whole document
before starting.
Pay Attention and Work slowly when doing this, pay special attention to
how everything comes apart. There are several small parts that need to
go back in the correct places when assembling the fob again. Take
photos if possible at every stage just in case.
Ok let s take the key apart.
1. Firstly remove the battery.
Flip out the key (deploy it) and this should give you access to the battery
holder.
Turn the screw to Unlock and then remove the battery. You can just see the
screw in this picture.
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Here s the battery removed. The
battery is a 3 Volt CR2032 (Panasonic
say) which you should be able to buy
in most electrical shops. Note that the
+ve of the battery faces down towards
the desk in this picture.
2. Remove the Fob Screw
Remove the Alfa logo (don t ask me how
as my key doesn t have one . )
Remove the screw under the badge.
3. Prise Open the Fob
This part may be tricky the previous
owner had glued the end of my key
together to prevent it falling off the key
ring (i.e. to stop the metal thingy coming out the end). Get a small blade
screwdriver and slowly work around the join of the fob prising it apart. Due to the
glue mine only opens like a clam shell which makes working at it harder (so all my
descriptions are with the key prised open from the battery side), yours should open
fully and the next steps will be easier for you.
Here s what my fob looks
like prised open.
The 3 pronged
clip is important
as it picks up the
+ve side of the
battery. Notice
that all 3 prongs
are above the
PCB (printed
circuit board
i.e. the green
board in the
picture) do not
insert it with the
middle one
behind the PCB
(this is a very
easy mistake to
make). Note the
middle prong
touches a large
brown contact
pad on the PCB.
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Also note the small clip marked 2. It s not that easy to see so I left the resolution on the
photo quite high. This clip must again be above the PCB and when the key is
assembled it touches the brown contact pad on the PCB. Do not replace the PCB
with this contact hidden it must be on the underside of the PCB as shown and not
on the component side. This clip is part of a large metal clip which starts off at the
very back of the fob as seen looking at the photo (i.e. it is way down inside the fob
where my finger is at the bottom of the photo). The job of this clip is to pick up the ve
of the battery and to route it to the contact shown.
Note - please look carefully at these two clips before taking the fob apart as they
must go back exactly in the right positions. The 3 pronged clip is held in by the PCB
and will fall out as soon as you remove the PCB. This clip is very fiddly to get back in
correctly.
Note also that the key itself is sprung and will fall out so try to see how it goes together
before it falls out and don t loose and of the parts there s a small spring and a
keyed button (that s the button you use to deploy the key).
4. Remove the PCB
Maybe your fob will come right apart and the next stages will be easier for you. I had
to work with the fob levered open as shown above.
Next prise out the PCB put a small bladed screwdriver in behind it and it should fall
out. Make sure you don t loose the 3 pronged clip.
5. Replace the Micro-switch
You should see two micro-switches on the PCB. However it is not unusual for one of
them to have broken or partially fallen off. Locate the broken micro-switch and
desolder it from the board. You ll need a fine solder tip for this and steady hands. Do
not splash any solder on the PCB or like me you ll short out some tracks and the key
won t be recognised by your car. If you do then remove the solder splash with some
braid (the braid from inside a TV aerial BNC cable should work).
The micro-switches are similar to this .
This is a J bend one the contacts at either end are shaped like
a J. The fob uses gull wing ones which are shaped like an L so
the electrical contacts lie flat on the PCB.
Here s a drawing
of the gullwing
type.
The micro-switches are from ITT and are KSR251G type
(KSR253G will also do as will KSR231G and KSR233G).
Here s the PCB
removed.
The micro-switches are the
silver rectangles with black
dots (buttons) marked as 1
and 2.
1 is for the central
locking/alarm and 2 is the
boot release (I hope that s
correct). This is the view
after I replaced the switch
so I haven t got a photo of
it broken (the top was
cracked and part of it
eventually fell out).
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Here s what it looked like after I had removed
the faulty switch.
Sorry about the quality of this picture arrow 1
points to the area where the central locking
micro-switch was removed. The contacts are to
the left and right of the tip of the arrow. Arrow 2
points to the other micro-switch still I position
(you can just make out the black button).
6. Putting it Back Together
This is actually quite hard and requires 4 hands .
Snap the key back as shown in section 3 so the fob is open like a clam-shell. Or if your
key comes fully apart then ignore and just proceed to the next paragraph.
Drop in the PCB with the micro-switches against the rubber buttons on the top of the
key. Make sure the clip at the end is touching the contact (clip 2 in section 3). Prise up
the edge of the PCB closest to you and then slip the 3 pronged clip in under it making
sure all 3 prongs are visible. Jiggle the clip until it touches the contact and the edge of
it is trapped by the edge of the PCB. It s hard to describe so that s why I suggested
paying attention to how it came out.
Now insert the spring for the key and put the button on the end of it. Note the button
has 3 keyed lugs on it which locate into the hinge of the key. The spring has a foot
sticking out of it and this foot anchors the spring against a plastic lug on the fob. Wind
the button up against the spring so that it flips the key out when deployed. Wind it anticlockwise
looking down on it I wound it three rotations I think. Next slip the key over
the button and using a screwdriver or forceps turn the button until it springs into place
in the recess in the key note the button must protrude out the top of the key so make
sure the lugs in the button slip into the correct slots in the key hinge.
Now try to put the fob back together and is everything goes well snap it shut and
replace the screw which was under the logo.
Replace the battery and press either of the rubber buttons. The red LED should come
on. If not then the most likely problem is that the two clips haven t been installed
correctly so check these.
7. The Scarey Bit
Next run out and try the key. Both buttons should work and .. the key should start the
car. If the key doesn t get recognised by the car then open it up again and check for
solder splashes.
That s about it pretty difficult in a way and certainly not for the novice.
Any questions then email me on stockdam@hotmail.com
Zdjęcia kluczyków
Schematy kluczyków
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Here s how I changed the microswitch
on my 2 button flip style
key-fob.
Firstly here s a photo of it to show
you the type I mean. My car is a
2001 2L TS 156.
My key worked fine except for
the alarm/central locking
button.
Warning . Before attempting this work you need to be a fairly
competent solderer; the components are small and any solder splashes
could result in the key not operating - with the result that it won t start the
car (i.e. it won t be recognised). Read through this whole document
before starting.
Pay Attention and Work slowly when doing this, pay special attention to
how everything comes apart. There are several small parts that need to
go back in the correct places when assembling the fob again. Take
photos if possible at every stage just in case.
Ok let s take the key apart.
1. Firstly remove the battery.
Flip out the key (deploy it) and this should give you access to the battery
holder.
Turn the screw to Unlock and then remove the battery. You can just see the
screw in this picture.
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Here s the battery removed. The
battery is a 3 Volt CR2032 (Panasonic
say) which you should be able to buy
in most electrical shops. Note that the
+ve of the battery faces down towards
the desk in this picture.
2. Remove the Fob Screw
Remove the Alfa logo (don t ask me how
as my key doesn t have one . )
Remove the screw under the badge.
3. Prise Open the Fob
This part may be tricky the previous
owner had glued the end of my key
together to prevent it falling off the key
ring (i.e. to stop the metal thingy coming out the end). Get a small blade
screwdriver and slowly work around the join of the fob prising it apart. Due to the
glue mine only opens like a clam shell which makes working at it harder (so all my
descriptions are with the key prised open from the battery side), yours should open
fully and the next steps will be easier for you.
Here s what my fob looks
like prised open.
The 3 pronged
clip is important
as it picks up the
+ve side of the
battery. Notice
that all 3 prongs
are above the
PCB (printed
circuit board
i.e. the green
board in the
picture) do not
insert it with the
middle one
behind the PCB
(this is a very
easy mistake to
make). Note the
middle prong
touches a large
brown contact
pad on the PCB.
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Also note the small clip marked 2. It s not that easy to see so I left the resolution on the
photo quite high. This clip must again be above the PCB and when the key is
assembled it touches the brown contact pad on the PCB. Do not replace the PCB
with this contact hidden it must be on the underside of the PCB as shown and not
on the component side. This clip is part of a large metal clip which starts off at the
very back of the fob as seen looking at the photo (i.e. it is way down inside the fob
where my finger is at the bottom of the photo). The job of this clip is to pick up the ve
of the battery and to route it to the contact shown.
Note - please look carefully at these two clips before taking the fob apart as they
must go back exactly in the right positions. The 3 pronged clip is held in by the PCB
and will fall out as soon as you remove the PCB. This clip is very fiddly to get back in
correctly.
Note also that the key itself is sprung and will fall out so try to see how it goes together
before it falls out and don t loose and of the parts there s a small spring and a
keyed button (that s the button you use to deploy the key).
4. Remove the PCB
Maybe your fob will come right apart and the next stages will be easier for you. I had
to work with the fob levered open as shown above.
Next prise out the PCB put a small bladed screwdriver in behind it and it should fall
out. Make sure you don t loose the 3 pronged clip.
5. Replace the Micro-switch
You should see two micro-switches on the PCB. However it is not unusual for one of
them to have broken or partially fallen off. Locate the broken micro-switch and
desolder it from the board. You ll need a fine solder tip for this and steady hands. Do
not splash any solder on the PCB or like me you ll short out some tracks and the key
won t be recognised by your car. If you do then remove the solder splash with some
braid (the braid from inside a TV aerial BNC cable should work).
The micro-switches are similar to this .
This is a J bend one the contacts at either end are shaped like
a J. The fob uses gull wing ones which are shaped like an L so
the electrical contacts lie flat on the PCB.
Here s a drawing
of the gullwing
type.
The micro-switches are from ITT and are KSR251G type
(KSR253G will also do as will KSR231G and KSR233G).
Here s the PCB
removed.
The micro-switches are the
silver rectangles with black
dots (buttons) marked as 1
and 2.
1 is for the central
locking/alarm and 2 is the
boot release (I hope that s
correct). This is the view
after I replaced the switch
so I haven t got a photo of
it broken (the top was
cracked and part of it
eventually fell out).
Alfa 2 Button Flip Key-fob replacing a micro-switch
Produced by Michaeld for www.alfa156.net
Here s what it looked like after I had removed
the faulty switch.
Sorry about the quality of this picture arrow 1
points to the area where the central locking
micro-switch was removed. The contacts are to
the left and right of the tip of the arrow. Arrow 2
points to the other micro-switch still I position
(you can just make out the black button).
6. Putting it Back Together
This is actually quite hard and requires 4 hands .
Snap the key back as shown in section 3 so the fob is open like a clam-shell. Or if your
key comes fully apart then ignore and just proceed to the next paragraph.
Drop in the PCB with the micro-switches against the rubber buttons on the top of the
key. Make sure the clip at the end is touching the contact (clip 2 in section 3). Prise up
the edge of the PCB closest to you and then slip the 3 pronged clip in under it making
sure all 3 prongs are visible. Jiggle the clip until it touches the contact and the edge of
it is trapped by the edge of the PCB. It s hard to describe so that s why I suggested
paying attention to how it came out.
Now insert the spring for the key and put the button on the end of it. Note the button
has 3 keyed lugs on it which locate into the hinge of the key. The spring has a foot
sticking out of it and this foot anchors the spring against a plastic lug on the fob. Wind
the button up against the spring so that it flips the key out when deployed. Wind it anticlockwise
looking down on it I wound it three rotations I think. Next slip the key over
the button and using a screwdriver or forceps turn the button until it springs into place
in the recess in the key note the button must protrude out the top of the key so make
sure the lugs in the button slip into the correct slots in the key hinge.
Now try to put the fob back together and is everything goes well snap it shut and
replace the screw which was under the logo.
Replace the battery and press either of the rubber buttons. The red LED should come
on. If not then the most likely problem is that the two clips haven t been installed
correctly so check these.
7. The Scarey Bit
Next run out and try the key. Both buttons should work and .. the key should start the
car. If the key doesn t get recognised by the car then open it up again and check for
solder splashes.
That s about it pretty difficult in a way and certainly not for the novice.
Any questions then email me on stockdam@hotmail.com
Zdjęcia kluczyków
Schematy kluczyków