[sdiy] Emu XL7 Keypad - Light Sensor

[Simon Brouwer]

Hi,
 
The trick is to clean the solder off from all the pads using sucking wick, then
put a drop of new solder on just one of the pads. If necessary, apply some extra
flux on it.
Hold the component in place with tweezers, so that one of the legs rest on the
drop of solder, and the others are aligned with their respective pads. Solder
the leg into the solder drop. If the alignment is off you can still correct it
since only one leg is soldered.
When the component is nicely in place and fixated by the one leg, it is easy to
solder the other legs.
I hope my description is clear enough,
 
Best regards
Simon

> Op 28 januari 2016 om 23:05 schreef random variate
> <randomvariate at hotmail.co.uk>:
> 
>  Flux and a fine conical solder bit.
> 
>  I use a flux pen.
> 
>  Helps the small surface area rid itself of oxides and for the solder to bind.
> 
>  I add solder to each pad first, place component into position, then heat each
> pad to melt solder under the pad and fuse component to board.
> 
>  Trick is to find a method to hold the component steady in place!
> 
>  Good luck
> 
>  Tim
> 
>  ---------------------------------------------
>  From: foRUMS 4 punkdISCO mailto:forums at punkdisco.co.uk
>  Sent: ‎28/‎01/‎2016 22:00
>  To: synth-diy at dropmix.xs4all.nl mailto:synth-diy at dropmix.xs4all.nl
>  Subject: Re: [sdiy] Emu XL7 Keypad - Light Sensor
> 
>  Super big thanks Tom and Simon..
> 
>   
> 
>  Assuming I can find the part (this seems likely) will it be very difficult to
> solder Out/In?  Ive done a reasonable amount of DIY soldering but only one big
> through hole stuff..
> 
>   
> 
>  Ta,
> 
>   
> 
>  Paul
> 
>  London
> 
>  www.punkdisco.co.uk
> 
>   
> 
>  From: Tom Bugs [mailto:admin at bugbrand.co.uk]
>  Sent: 28 January 2016 21:43
>  To: synth-diy at dropmix.xs4all.nl
>  Subject: Re: [sdiy] Emu XL7 Keypad - Light Sensor
> 
>   
> 
>  I thought 'photoreflector' but then looking at Mouser that term should maybe
> be changed to 'optical switch, reflective'
>  Here are some:
> 
> http://www.mouser.co.uk/Optoelectronics/Optical-Switches/Optical-Switches-Reflective-Phototransistor-Output/_/N-abusl/?No=25
>  From a quick scan there may be something similar.
> 
>  Worth giving Emu tech a shout to see if you can get a parts number?
> 
>  On 28/01/2016 21:29, foRUMS 4 punkdISCO wrote:
> 
>      > > 
> >      Hi all
> > 
> >       
> > 
> >      I have a new Emu XL7 (a complete blast!) but one of the keypads is very
> > flaky (mainly dead).
> > 
> >       
> > 
> >      It is definitely not the rubber pad or the rubber contacts.  I’ve
> > cleaned these all up and done various experiments..
> > 
> >       
> > 
> >      I think the issue is a flaky light sensor of some description..  In the
> > below picture, the square component marked U1 is some sort of light sensor;
> > you can trigger the sounds by putting your finger over these.  Anyway, the
> > faulty one I can get working by pressing it around a bit but after I
> > re-assemble, it eventually stops working again.
> > 
> >      https://farm2.staticflickr.com/1470/24047199144_8e49158937_b.jpg
> > 
> >       
> > 
> >      So my questions are:
> > 
> >       
> > 
> >      1)      What is this component?
> > 
> >      2)      Will it be easy to find a modern replacement?
> > 
> >      3)      It’s VERY small so is it going to be impossible to swap out?
> > 
> >       
> > 
> >      Big thanks for any reply’s..
> > 
> >       
> > 
> >      Paul
> > 
> >      Londonhttp://www.punkdisco.co.uk
> > 
> >       
> > 
> > 
> > 
> > 
> >      _______________________________________________
> > 
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> > 
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> > 
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> > 
> >  > 
> 
> 
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