Midway 4-Player 25" Dedicated Video Game User Manual
Page 98
Wiring 5-10
CPU BOARD LED INDICATOR STATUS TABLE
Device
Location
Function
Color
State
Meaning
Off
Insufficient Power
On
Power OK
LED1
Near U6, U7 &
U16
3.3V CPU
Power
Indicator
Red
Blinking
Power Supply Fault
Off
Disk Not in Use
On
Locked Up Disk
LED2
Near U28 &
Connector P5
Hard Disk
Drive
Activity
Green
Blinking
Normal Disk Activity
Off*
On*
RP63
Near U22 &
U26
Indicator
Red
Blinking*
Sequentially
See Note 3, Below.
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 (“-“).