(Topic ID: 64299)

Stupid opto question....

By nighttaco

5 years ago

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  • 8 posts
  • 5 Pinsiders participating
  • Latest reply 61 days ago by G-P-E
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5FD67F2F-E4CC-4493-B821-DCD81CE87B2B (resized).jpeg

#1 5 years ago

On my fish tales I am replacing a bad opto, is the board that has e and c stamped on it with the tinted led the emitter? Bought replacement leds from radio shack and it appears the tinted is the emitter on the radio shack one...

#2 5 years ago

E & C stand for emitter and collector -- this is part of the receiving opto.
A & K (sometimes A & C) stand for anode and Cathode -- part of the emitter opto.
The emitter is typically tinted light pink or light blue.
The receiver is typically dark filtered and often black.

#3 5 years ago

Awesome, thank you

5 months later
#4 5 years ago

I hate to reply to an older thread but my question is pretty to this.

I'm replacing a couple of emitters on a trough board for my Demolition Man. Both the emitter and receiver have one leg that's slightly longer than the other. I assume this means there's a backwards and a rightwards way to installing them. Is there a general rule or way to know which hole the long leg goes in and which the short leg goes into?

I haven't pulled the board yet but I'm sure there isn't a long leg here label so I'm asking in advance. I figured I'd try my first board repair here since the boards are expensive and I have the factory optos in-hand. I've replaced a couple of other burnt opto transmitters with great success so these are probably burnt as well. I will double-check before taking it apart.

The burnt optos don't effect play but I want to go into the Southern-Fried Gameroom Expo Free Play. (dot) free and see if she can make it out Free Play. (dot) free. This is one of the last items on my hit list for this gal.

Edit: Added additional detail.

#5 5 years ago

Long leg is the positive, short connect to the negative.

#6 5 years ago

Wow. That was fast. There's a symbol on the board? Thanks!

5 years later
#7 61 days ago

And which one of these points are positive and negative? Not sure which way to install the LED. Thanks!5FD67F2F-E4CC-4493-B821-DCD81CE87B2B (resized).jpeg

Edit: ah the flat side is printed on the board. Easy

#8 61 days ago

Photo of otherside?
Emitter typically has one side that is flat. The flat is towards the cathode.
Schematics for that board should also show which end is which. There is a shared trace between LED 4 and LED5. Should be able to identify which end is which based on that.

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