The 520-5050-00 sound board variant

Some Star Wars games carry a 520-5050-00 board with a BSMT2000, a 27256 or 27512 at U7 and two voice EPROMs of up to 27040 at U17/U21. Little else is known about it.

Systems

• Data East CPU Version 3

Games

• Star Wars

Related tips

• Check the sound board's regulated -5 V and +5 V
• Data East and Sega sound boards by game
• No sound at all: check the -5 V regulator
• Loud hum from the speakers
• Sound board power input connector CN2
• No sound with all voltages present: the PALs
• No sound, only amplifier hiss with the volume up
• Sounds suddenly come out wrong even with new ROMs: bad ribbon cable

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)