Midway 4-Player 25" Dedicated Video Game manual Sound I/O Board LED Indicator Status Table, Led

SOUND I/O BOARD LED INDICATOR STATUS TABLE

LED	Location	Function	Color	State	Meaning
LED1	Near U11	Not Used	Green	Off	--
				On	--
(Note 1)		(Remains Off)		Blinking	--
LED2	Near U34 & Crystal	Linking Connector	Green	Off	Not in Use (No Game Linking)
				On	Link Continuity Good
(Note 2)	Y1	Status
LED3	Near the JAMMA	-5V Power Indicator	Red	Off*	No Power
				On*	Normal Operation
(Note 2)	Connector
LED4	Near U35 &	+12V Power	Red	Off	No Power
(Note 2)	Connector P14	Indicator		On	Normal Operation
LED5	Near Connector	+5V Power Indicator	Red	Off	No Power
(Note 2)	P23			On	Normal Operation
	Near U34 & Crystal	CPU Linking Activity	Red	Off	Not in Use
LED6	Y1			On	CPU Communicating with
(Note 2)					Ethernet Controller
	Near U34 & Crystal	Linking Transmitting	Red	Off	Not in Use (No Game Linking)
LED7	Y1	Data		On	Sending Data
(Note 2)				Blinking	Normal Operation
	Near U14 & Crystal	Audio Activity	Yellow	Off	No Sound Boot ROM
LED8	Y1			On	Locked Up
(Note 1)				Blinking	Normal Operation
LED9	Near U34 & Crystal	Linking Receiving	Yellow	Off	Not in Use (No Game Linking)
(Note 2)	Y1	Data		On	Receiving Data
	Near U44 & Crystal		Green	Off	--
LED10	Y2	Not Used		On	--
(Note 1)		(Remains On)		Blinking	--
	Near U44 & Crystal		Red	Off	--
LED11	Y2	Not Used		On	--
(Note 1)		(Remains On)		Blinking	--
	Near U44 & Crystal		Yellow	Off	--
LED12	Y2	Not Used		On	--
(Note 1)		(Remains On)		Blinking	--
	Near U44 & Crystal		Yellow	Off	--
LED13	Y2	Not Used		On	--
(Note 1)		(Remains On)		Blinking	--

Notes

1.Software controls this LED. Indications are game and revision-specific. Changing the EPROMs on this board may alter the function of this LED. Firmware damage may also cause new or different LED behavior.

2.Hardware controls this LED. Indications depend on hard-wired circuitry. A change in normal LED behavior may indicate a circuit fault. Changing the EPROMs on this board shouldn’t alter the function of this LED.

Wiring 5-13