Midway 4-Player 25" Dedicated Video Game manual CPU Board LED Indicator Status Table

CPU BOARD LED INDICATOR STATUS TABLE

Device	Location	Function	Color	State	Meaning
LED1	Near U6, U7 &	3.3V CPU	Red	Off	Insufficient Power
	U16	Power		On	Power OK
		Indicator
				Blinking	Power Supply Fault
LED2	Near U28 &	Hard Disk	Green	Off	Disk Not in Use
	Connector P5	Drive		On	Locked Up Disk
		Activity
				Blinking	Normal Disk Activity
RP63	Near U22 &	Indicator	Red	Off*	See Note 3, Below.
	U26			On*
				Blinking*
				Sequentially

Notes

1.LED1 monitors CPU power (+3.3 volts). If his LED is off or blinking, investigate processor circuits. If other LEDs are off or blinking at the same time, check +5-volt circuits or the game power supply.

2.LED2 flashes when the hard disk is operating during game play. LED2 may light continuously during startup. If this LED remains lighted, the hard drive may be locked up or faulty.

3.Software controls RP63. In this game, RP63 initially indicates program startup stages. This LED is a seven- segment, alphanumeric display device. Normally, RP63 displays a lowercase “b,” or an “O” pattern with sequentially blinking segments. During Self-Test screens, RP63 displays a “bouncing bar” that resembles a hyphen (“-“).

Wiring 5-10