[sdiy] Emu XL7 Keypad - Light Sensor

[punkdISCO]

Hi Richie 

Good spot!!  Before I knew it was optical I cleaned it with some switch cleaner on a cotton bud. These are probably the white whiskers you see.

Anyway I expect my "cleaning " might have made it worst/broke.  Tonight I'll give it a good vacuumed and see if improves before starting the soldering..

Thanks all..

Paul
London 
www.punkdisco.co.uk

> On 28 Jan 2016, at 23:02, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> 
> 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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> 
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