[sdiy] Emu XL7 Keypad - Light Sensor

[random variate]

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-Re
flective-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

London

www.punkdisco.co.uk <http://www.punkdisco.co.uk>








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