Document Title: [Galaxian To JAMMA.html (html file)]
Remove IR2 (78GU I.C.) Remove IR1 (D44VM4 transistor) Remove R88 (50Ohm 5W resistor) Replace D4 (A15F diode) with a wire link Replace D5 (A15F diode) with a wire link Replace D6 (A14F diode) with a wire link Replace D7 (A14F diode) with a wire link Replace R87 (4Ohm 10W resistor) with a wire link Add a wire link from edge connector pair 5,E to edge connector pair 4,D (0.6mm solid core, via to via)A fuse, F1, was listed in the schematic but didn't seem to be implemented (explicitely) on any of my boards. If it does exist, it should be bypassed with a wire link and the whole supply fused at source.
For reference, here are the pinouts for both the original AC supply and the DC converted supply:-
PARTS SOLDER --------------------X-------------------- GND A 1 GND GND B 2 GND 7V AC "+" C 3 7V AC "+" 7V AC "-" D 4 7V AC "-" +7V DC out E 5 +7V DC out 1P Start Lamp F 6 2P Start Lamp Coin Lockout H 7 Coin Counter Coin 1 J 8 Coin 2 Test K 9 Service 1 Player Start L 10 2 Player Start Player 1 Left M 11 Player 1 Right Player 1 Fire N 12 Player 2 Fire Player 2 Left P 13 Player 2 Right Table R 14 (spare input) GND S 15 Video GND Video Red T 16 Video Green Video Blue U 17 Video Sync Speaker A V 18 Speaker B 12V AC "+" W 19 12V AC "+" 12V AC "-" X 20 12V AC "-" GND Y 21 GND GND Z 22 GND --------------------X--------------------
PARTS SOLDER --------------------X-------------------- GND A 1 GND GND B 2 GND +5V DC C 3 +5V DC +5V DC D 4 +5V DC +5V DC E 5 +5V DC 1P Start Lamp F 6 2P Start Lamp Coin Lockout H 7 Coin Counter Coin 1 J 8 Coin 2 Test K 9 Service 1 Player Start L 10 2 Player Start Player 1 Left M 11 Player 1 Right Player 1 Fire N 12 Player 2 Fire Player 2 Left P 13 Player 2 Right Table R 14 (spare input) GND S 15 Video GND Video Red T 16 Video Green Video Blue U 17 Video Sync Speaker A V 18 Speaker B +12V DC W 19 +12V DC +12V DC X 20 +12V DC GND Y 21 GND GND Z 22 GND --------------------X--------------------