Midway 4-Player 25" Dedicated Video Game User Manual
Page 101
Wiring 5-13
SOUND I/O BOARD LED INDICATOR STATUS TABLE
LED
Location
Function
Color
State
Meaning
Off
--
On
--
LED1
(Note 1)
Near U11
Not Used
(Remains Off)
Green
Blinking
--
Off
Not in Use (No Game Linking)
LED2
(Note 2)
Near U34 & Crystal
Y1
Linking Connector
Status
Green
On
Link Continuity Good
Off*
No Power
LED3
(Note 2)
Near the JAMMA
Connector
-5V Power Indicator
Red
On*
Normal Operation
Off
No Power
LED4
(Note 2)
Near U35 &
Connector P14
+12V Power
Indicator
Red
On
Normal Operation
Off
No Power
LED5
(Note 2)
Near Connector
P23
+5V Power Indicator
Red
On
Normal Operation
Off
Not in Use
LED6
(Note 2)
Near U34 & Crystal
Y1
CPU Linking Activity
Red
On
CPU Communicating with
Ethernet Controller
Off
Not in Use (No Game Linking)
On
Sending Data
LED7
(Note 2)
Near U34 & Crystal
Y1
Linking Transmitting
Data
Red
Blinking
Normal Operation
Off
No Sound Boot ROM
On
Locked Up
LED8
(Note 1)
Near U14 & Crystal
Y1
Audio Activity
Yellow
Blinking
Normal Operation
Off
Not in Use (No Game Linking)
LED9
(Note 2)
Near U34 & Crystal
Y1
Linking Receiving
Data
Yellow
On
Receiving Data
Off
--
On
--
LED10
(Note 1)
Near U44 & Crystal
Y2
Not Used
(Remains On)
Green
Blinking
--
Off
--
On
--
LED11
(Note 1)
Near U44 & Crystal
Y2
Not Used
(Remains On)
Red
Blinking
--
Off
--
On
--
LED12
(Note 1)
Near U44 & Crystal
Y2
Not Used
(Remains On)
Yellow
Blinking
--
Off
--
On
--
LED13
(Note 1)
Near U44 & Crystal
Y2
Not Used
(Remains On)
Yellow
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.