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Post by jawadde12 on Aug 27, 2020 9:56:32 GMT
Hi there, my BO/AC 555 unit doesn,t work anymore and probarly a defect in the triac or transistors. But i can,t find wich replacement components a need. Has anyone a scematic layout or an component list wich triac or transistors being used in this control unit? I would love to get the coins working again....
Thank you very much,
Eric
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Post by Ron Rich on Aug 27, 2020 12:37:39 GMT
Hi Eric,
Check the 5 volt regulator-- they fail often on those--especially if plug, or price card, is removed/inserted with power on ! I have never seen a printed schematic, nor parts list for the BO/AC. I had a co-worker, who once worked for WurliTzer, that had a hand drawing of a parts list, he kept in his pocket-- would seldom show it to anyone ! Check with Hildegard (on our FAQ's suppliers list) in Germany-- IF ANYONE, in the world has it, it would be her ! Ron Rich
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Post by jawadde12 on Aug 27, 2020 13:13:25 GMT
Hi Ron,thank you very much for your reply.
I replaced the regulator with a TO-220 PNP.Because i don,t have any specs, it could be an NPN as well....But i,m going to ask Hildegard if he has any idea.
For now thanx again!!
Greet Eric
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Post by Ron Rich on Aug 27, 2020 13:21:41 GMT
Hi Eric,
Regulators, are neither "PNP", nor, "NPN" ! They ( in those days) were either "Positive", or "Negative". Do you have the old device-- if so, what are the numbers on it, and what are the numbers on the "new" one you used ? Ron Rich
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Post by jawadde12 on Aug 27, 2020 14:18:58 GMT
I,m sorry Ron, you are wright. I thought that the difference of a "positive" or "negative" regulator is expressed as PNP or NPN.... I go check the numbers tonight and i,m going to try to measure the 5v output voltage of the old one and the one i placed. Then i can determine of their is any power to the 5V circuit.. Now i,m beginning to understand how the regulator works and what it should do... To be continued..  |
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Post by jawadde12 on Aug 27, 2020 15:24:46 GMT
Hi Ron, I measured the old regulator and it gives 2V+.(thats not good i suppose) The numbers on this regulator are: 7309 EP328 138379 and a logo of texas intruments. The new regulator is a TR-NPN TIP31C TO-220 5V+ fixed. So?  ?? |
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Post by Ron Rich on Aug 27, 2020 17:16:32 GMT
The "new Regulator" is NOT a "regulator
'--it is a Transistor ! You might want to re-check those numbers on the old regulator-- they make no sense to me ? Ron Rich
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