Sams schematic general question

[Henry Finley]

I've been in electronics a lot of years but this is a new one on me. This schematic is out of a Sams TR book. It is a 1965 Ampex 1160 tape recorder. Looking at the places on the schematic I've marked with pink circles, why do they break the line up with a black dot on one end and an outlined dot at the other end of the break? Am I to ignore the break and consider it as a continuous line? Thank you.

 

[avionic]

Am I to ignore the break and consider it as a continuous line?

Perhaps a plug in connector ? Weird..

 

[cademan]

Could be for a remote control.

 

[drjim]

It's for connecting a component on a circuit board, like the junction of C28/R73/R74 to a single wire, like the wire running to the positive meter connection. Could be a "pin-and-post" type, like a single conductor Molex on the wire to a pin on the board, or maybe just a solder pad where the meter wire goes. Symbols like that are generally used to denote some type of removable/unpluggable connection.

 

[gadget73]

^^ yep, this. If you look further up at the play switch you get open circles, which would indicate the wires solder to the switch, or the switch solders to a board. Not sure how this one is actually constructed but its a connection of some fashion, just not one thats meant to be disconnected.

 

[Powertech]

Agreed. They are connections to components or devices which are off-board.