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Author Topic: Can an opto isolator have degraded performance?  (Read 6685 times)
jbshocks
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« on: September 27, 2011, 06:28:57 PM »
is an opto isolator simply good or bad or can they be intermittent or pass an inaccurate signal? 
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ChizzleMonkey
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« Reply #1 on: September 28, 2011, 01:25:03 PM »
It depends on what testers and why you are testing it? Circuit boards have no end these days...
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Keep it simple.
stayouttadabunker
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« Reply #2 on: September 28, 2011, 01:54:33 PM »
JB,
Where specifically is this optic isolator located and on what kind of machine?
Maybe we can help you more.

A general answer to your question would be "yes, they can go bad"...but
that would be my same reply to any other machine part too... rotflmao
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cowboygames
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« Reply #3 on: September 28, 2011, 08:16:07 PM »
In all my years working on TVs I never came across anything but good or bad ones. Never saw one that was damaged but partially working. The ones I dealt with were in the power supply section. What are you dealing with and why do you suspect it's faulty?
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jbshocks
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« Reply #4 on: September 28, 2011, 08:44:26 PM »
this is on my cei slot.  The reel speed and position is detected by an optical sensor that feeds into an opt isolator.  The manual was  saying to replace the opto isolator but I did not believe it could be intermitent.   I have it working again and probably caused the issue myself.  Between adjusting the optical sensor air gap and forcing a reel calibration its back in action.
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cowboygames
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« Reply #5 on: September 28, 2011, 08:46:46 PM »
Good job! Clap I figured you were working on a monitor
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stayouttadabunker
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« Reply #6 on: September 28, 2011, 09:06:19 PM »
Quote from: jbshocks on September 28, 2011, 08:44:26 PM
this is on my cei slot.  The reel speed and position is detected by an optical sensor that feeds into an opt isolator.  The manual was  saying to replace the opto isolator but I did not believe it could be intermitent.   I have it working again and probably caused the issue myself.  Between adjusting the optical sensor air gap and forcing a reel calibration its back in action.
Quote from: cowboygames on September 28, 2011, 08:46:46 PM
Good job! Clap I figured you were working on a monitor

Sure sounds more like he's working with physical slot stepper reels?
I could be wrong...lol
It won't be the 1st time... rotflmao
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jbshocks
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« Reply #7 on: September 28, 2011, 10:28:53 PM »
What are physical slot steppers?  Hall affect switch with a slot in the reel?    These have a sensor with an led that shines against a series of wide and narrow reflective strips on the reel edge.  The reflection is picked up by an optical transistor that transmits back to the main board and the first step is an opto isolator.
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stayouttadabunker
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« Reply #8 on: September 28, 2011, 10:34:44 PM »
Quote from: jbshocks on September 28, 2011, 10:28:53 PM
What are physical slot steppers?  

In the slot machine world...these are otherwise called...uh... "reels"...
Another term is>> "Stepper Reels"
They are controlled by the notches on an internal wheel passing through optics.
The wide/narrow reflective strips on yours is an upgrade (somewhat) to the older "notches"
for controlling the reels.
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knagl
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Kevin
« Reply #9 on: September 29, 2011, 08:46:31 PM »
His machine doesn't use stepper motors, I don't think.   no

Check out this post and the ones below it.  propeller
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jbshocks
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« Reply #10 on: September 29, 2011, 08:53:49 PM »
right no steppers.  tiny DC motors
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stayouttadabunker
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« Reply #11 on: September 30, 2011, 01:49:05 AM »
Wow! That is one strange machine huh?
I've NEVER seen one before...!!!
Pretty cool link Knagl!  applause
I can honestly say that I know nothing about these CEI's...nothing! lol
I'd love to get my hands on one of those puppies just for the pure heck of it!
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nightmaretony
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« Reply #12 on: March 31, 2012, 02:10:13 PM »
Optos do indeed degrade. Had that issue with centipede and Tempest and back when we were designing Arkanoid all the time. they degrade, get less sensitive and need replaceent. Regapping doesnt help out., Maybe the emitting LED dims like LEDs do after time...
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