This may help make sense of that split primary winding - the 115V wiring diagram from the same schematic. Although there is no "3" tab on your transformer, possibly an internal connection? If internal, you should also see some resistance between terminals 1 and 7.
Bally_1972_Fireball_Transformer_Connections.pdf
I measured the resistance of the lugs as follows.
1-5, 1-7, 1-9 are all open.
1-2, 1-4 are shorted.
1-6, 1-8, 1-10 are all open.
5-7, 5-9, 5-2, 5-4 are all open.
5-6 is shorted.
5-8, 5-10 are open.
7-9, 7-2, 7-4, 7-6 are all open.
7-8 is shorted.
7-10 is open.
9-2, 9-4, 9-6, 9-8 are all open.
9-10 is shorted.
By looking at the schematic from DaMoib, shouldn't I see a short between 1+5/7?
When you say "short", you are reading 0.0 ohms?
The schematic I included states that the *operator* needs to short the 1,3 and 5,7 terminals for 115V operation, 220V operation requires an entirely different wiring arrangement - shorting 3,5.
The fact that there is no terminal 3 on this transformer... you're right, this is looking like it is not the Bally transformer we are attempting to match it to.
The hunt goes on! Where did the transformer in question come from? Definitely a pinball machine?
Quoted from DaMoib:When you say "short", you are reading 0.0 ohms?
The schematic I included states that the *operator* needs to short the 1,3 and 5,7 terminals for 115V operation, 220V operation requires an entirely different wiring arrangement - shorting 3,5.
The fact that there is no terminal 3 on this transformer... you're right, this is looking like it is not the Bally transformer we are attempting to match it to.
The hunt goes on! Where did the transformer in question come from? Definitely a pinball machine?
Yes, short equals 0 ohms. This could be an early arcade machine, not necessarily a pinball machine. Unknown application...
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