Expert: Rodger Knutson - 2/20/2010

Question
QUESTION: how to check photo transistor. have checked light emitters. do not know how to check receivers. have new ones on order

ANSWER: Hi William,

Well guess what? This may surprised to learn about this but you can check them the same way, with an ohm meeter and a strong light behind each one. Pull the reader apart, pull off the tape covering the emitters and collectors so you can get at the emitter and collector wires and then check the ohms without light and check them again with bright light. Check them using an ohm meeter just like you were checking the old style 5 volt reel reader, lights and receivers. I hope this answerers your question.

Thank You and please leave feedback here for me.........

Sincerely

Rodger Knutson
http://www.coinslots.com

For slot machine manuals go to: http://jackpot7.freeyellow.com/page21.html

---------- FOLLOW-UP ----------

QUESTION: don't understand. I checked the light emitters with a dc power supply. all light up. don't understand how to check photo transmitter

ANSWER: Oh, sorry. I didn't know how you were testing them. The manual shows you how to properly check them using an ohm meeter I believe. but, do you know how to use an ohm meeter, maybe on your multimeter? Any open circuit would show nothing or infinite, just as if you touch nothing with the leads. A good direct connection like between the probes them-selfs would show maybe a "0" as no resistance at all. The readings of resistance would start to show and grow as more wire shows up between each of the probes. So if you test, say one receiver and it reads open without light in a low light area, you get nothing, and then you test it while the receiver is receiving direct and bright light and now you have a Reading. If not, maybe that one is bad so you compare it with the next one. If all show something and one shows nothing, you have found the bad one. I don't have one in front of me right now to test and remind myself just how this works out and which side "light/receiver" does what in the ohm's readings, but if you know how to read ohm's this is how you test them. Which type of reel readers are you testing? The 5 volt light models or the 50 volt inferred readers? You maybe must have the 5 volt models if you can see them light up, if so, and they all light up, then one of the receivers are bad. So now, just test the receivers one at a time, Test the ohms of each one in a low or no light condition, then put them right over a light souse and test them again in high lite condition, in low light they will be open and in high light they will be closed or the other way around. I think light will close them (or the ohm's will be less), then the ohm's are in the dark or low light condition. If you find one that will not change between low and high light, then that is the bad one, or if it reads way different then the rest of them it could be bad. Does this clear anything up or have I made a mess at trying to explain it all? If I have totally confused you then please let me know and I'll try to do a better job at trying to clear this up a little for you.

Thanks again William

Thank You and please leave feedback here for me.........

Sincerely

Rodger Knutson
http://www.coinslots.com

For slot machine manuals go to: http://jackpot7.freeyellow.com/page21.html


---------- FOLLOW-UP ----------

QUESTION: I have part m645-452 & m645-453. I get ohm reading on all receivers. some more some less. these units had to be changed becacause of 94000, 44000, and 74000. this is e series 1000. 5 volt bulbs on emmiter side. 50 volt reader. cs11673 photo transsistor.

Answer
William,

I have attached a photo which will show you the wiring layout of this early Bally Reel Reader board and the parts identification from the Bally E Series Printed Circuit Board Schematics/Parts Lists Bally Manual F)-650-13 which may be of some use for you to see how these are layed out. This is for the same assembly number as your readers are.

Thanks
Rodger Knutson
http://www.coinslots.com