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Trough Opto Board Parts

Calimori

Calimori

Staff member
10 Years
Joined
Mar 15, 2012
Messages
4,522
Location
Bedfordshure, UK
This is starting out as a technical question but might turn into a tips and tricks.

My IJ has a lovely bodged Trough Opto Transmitter Board so I plan to rebuild it.
The machine was complaining a trough switch wasn't working so I checked it and cleaned the Emitter and receiver. This made that error go away but the camera tested showed another appeared dead and test mode confirmed it was an issue.

A quick check showed that the resistor feeding the IR opto is giving a path in one direction and that has the wrong resistance so I will be replacing it.
They appear to be know as "big blue resistors" and are 270 ohm 2w resistors. I found a cheap supply on Amazon which will be delivered in the next couple of days for me to test.

Now the opto still might be working but I wanted to have some working spares. This thread aims to collect information from people on what has worked for them and can be sourced in the UK.

This link came from the Yahoo group and is in the USA: http://www.digipart.com/part/QED123
The description says: "FAIRCHILD SEMICONDUCTOR - QED123 - IR EMITTER; 880NM; T-1 3/4; THROUGH HOLE"

The next suggestion says: "A CY85G (stock code) from Maplins may be ok, LD271 IR emitter". These have Peak wavelength emission of 950±20nm and I don't know if they did work as a suggestion.

Taking the key spec from both items I guess what is needed is an IR Emitter of around 880NM of the size T 1 34 and 1.5v, a quick look on eBay found these: http://www.ebay.co.uk/itm/390461031622?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

Which I will play with when the arrive to see if they work and clean this thread up as a tips and tricks if I get it to work.

Has anyone has any other handy hints?
 
:eek:
I am shocked Sgt. Just buy a replacement board??

£7.54 for parts so far which should leave some spares. Still cheaper than a new board and this board can be repaired. What I learn can then be used to repair boards that can't be replaced. ;)
 
I'm with Geoff. If an individual component fails it's a lot cheaper to just replace that one component. And if you have spares on hand you can be back up and running within the hour next time you hit an issue.

Have you checked rs components (or farnell etc). If you know the spec you're looking for it becomes reasonably easy to narrow down to specific component.

If this link works it should show the 44 880nm IR emitters that rs stock.

http://uk.rs-online.com/web/c/displ...4868618&lastAttributeSelectedBlock=4294957064
 
Thanks for the link Paul, I was having problems with RS where my searches were not getting very good results. Handy to know they stock them because there is a trade counter down the road that is worth a try in emergencies. :)

I have always been in favour of repair instead of replace but also I have not had the best experience of buying replacement parts from Pinball Heaven. The 3 times I have used them have been disappointing or frustrating. :oops:
 
I totally agree on the repair if possible approach, and I don't doubt for one minute yr ability to sort it out .

The reasons I suggest new in this instance are(1) you mentioned it was previously bodged, (2) a replacement is relatively cheap and (3) most importantly these trough boards are notorious for taking abuse, having issues, and once they start playing up yr game is out of commission. For reliability going forward I would be tempted with new. But then I haven't seen the extent of the bodging etc.
 
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