O wow, this is definitly meant for a Midway Galaxian board !
I don't know about the Namco boards if they have different pin-out. Are there any schematics of the Namco board around ?
I would carefully bend up those two pins using that jumper, not sure if it's "on" far enough...(you could measure to check).
I also have a non-worker Midway under repair, so I will have a good use of this.
The Namco pinout looks similar, but I'm not sure about those AC/DC voltages
Galaxian - NAMCO
SOLDIER SIDE PARTS SIDE
--------------------------------------------------------
1 GND - 14V C.T. A GND - 14V C.T.
2 GND - 14V C.T. B GND - 14V C.T.
3 7VAC + C 7VAC +
4 7VAC - D 7VAC -
5 +7VDC UNREG E +7VDC UNREG
6 F
7 H
8 COIN 2 J COIN 1
9 SVC K TEST
10 START 2 L START 1
11 PL1 RIGHT M PL1 LEFT
12 PL2 SHOOT N PL1 SHOOT
13 PL2 RIGHT P PL2 LEFT
14 R TABLE
15 GND S GND
16 VID GN T VID RED
17 SYNC U VID BL
18 SP V SP
19 12VAC + W 12VAC +
20 12VAC - X 12VAC -
21 GND 24V C.T. Y GND - 24V C.T.
22 GND 24V C.T Z GND - 24V C.T.
