[sdiy] Emu XL7 Keypad - Light Sensor

[Richie Burnett]

Maybe tin-whiskers formed between the leads of that photo-detector?  Looks 
like there's some tiny white/shinny strands of something scattered on the 
PCB near the component in question, (or maybe they're just scratches to the 
green resist?)

I had a "wheel-mouse" that started to do occasional sporadic scrolls in 
Windows, then the scrollwheel eventually packed up working altogether.  Upon 
opening up the PC mouse there were loads of clearly visible tin-whiskers 
between the leads of the photo-detector for the scroll-wheel.

-Richie,



-----Original Message----- 
From: foRUMS 4 punkdISCO
Sent: Thursday, January 28, 2016 10:27 PM
To: 'random variate' ; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Emu XL7 Keypad - Light Sensor



Just order a few of the below.  Free next day delivery.



http://www.mouser.co.uk/Search/Refine.aspx?Keyword=QRE1113



> Good luck



Ill need a miracle!



J



Will let you know how I get on..



Thanks all,





Paul

London

www.punkdisco.co.uk







From: random variate [mailto:randomvariate at hotmail.co.uk]
Sent: 28 January 2016 22:06
To: foRUMS 4 punkdISCO <forums at punkdisco.co.uk>; synth-diy at dropmix.xs4all.nl
Subject: RE: [sdiy] Emu XL7 Keypad - Light Sensor







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
Sent: ‎28/‎01/‎2016 22:00
To: 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

London

www.punkdisco.co.uk







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