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(3) Fatal Alarm
Table 6.3 (1/2)
ALARM
CATEGORY
ALARM
LED DISPLAY
ALARM 10 12 15 17 20
PROP UTILITY PRESTIGE BOLD
REMARKS TROUBLESHOOTING
MAIN
CONTROL
ALARM
FIRMWARE
DETECTION
ALARM
SERIAL
INTERFACE
ALARM
MPU internal
RAM alarm
Program ROM
alarm
RAM on Control
Board alarm
CG ROM alarm
EEPROM alarm
WDT (Watch Dog
Timeout) alarm
NMI signal alarm
BRK instruction
alarm
MPU internal
RAM alarm
ROM alarm
RAM on I/F board
alarm
I/F not mounted
Read/write error
Check sum error
Read/write error
Check sum error
No reaction when MPU 
reads data
MPU is locked up and it 
ios reset after 65ms.
NMI port of MPU is
kept low level.
FFFF data is detected
due to MPU locked up.
Read/write error
Check sum error
Read/write error
No reaction from 
serial I/F board
Replace Control/
Power Supply Board
Replace ROM or Con-
trol/Power Supply Board
Replace Control/
Power Supply Board
Replace Control/
Power Supply Board
Replace Control/
Power Supply Board
Turn the power OFF and
ON or replace Control/
Power Supply Board
Turn the power OFF and
ON or replace Control/
Power Supply Board
Replace ROM or Con-
trol/Power Supply Board
Replace I/F Board
Replace ROM on I/F
board or I/F Board
Replace I/F Board
Replace I/F Board or
Control Board.
: LED Blink (200ms ON, 200ms OFF)
: LED Lights up
100


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