Gottlieb Hot Shot (Gottlieb, 1973) Loud Buzz coming from Knocker

[Tommycanyouhearme]

I have a loud buzz coming from the knocker unit on my 1973 Gottlieb Hot Shot machine. Could this a relay unit problem? If so which relay?
Thanks,
Tom

 

[pinballdaveh]

the knocker is usually controlled by a end of stroke switch on the credit unit. check if the credit unit is stuck , check step up and step down functions also. what all conditions make that issue happen? why didnt any of the manufactures that made the playboy versions ever have 2 knockers in them? i would like to boast saying that my playboy has knockers. imagine the increase in popularity.

 

[Coil_Smoke]

Knockers...?

Does that Gottlieb game have an 'AS' relay controlling the 'Match' circuit?

AND...

<a href="<iframe width=" 420"="" height="315" src="//www.youtube.com/embed/XTw1lzxTAis?rel=0" frameborder="0" allowfullscreen="">"><a href="<iframe width=" 420"="" height="315" src="//www.youtube.com/embed/XTw1lzxTAis?rel=0" frameborder="0" allowfullscreen=""><iframe src="//www.youtube.com/embed/XTw1lzxTAis?rel=0" allowfullscreen="" frameborder="0" height="315" width="420"></iframe>
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[Tommycanyouhearme]

I will check for an AS relay switch. Young Frankenstien is my all time favorite movie Thank you!