OKIDATA ML320 Turbo Service Manual page 111

PITCH. (See Table 6.3 below for details.)
(3) Fatal Alarm
Alarm Alarm
Category
Main Control MPU internal
Alarm RAM alarm
Main Control Program
Alarm ROM alarm
Main Control RAM on
Alarm Control
Board alarm
Main Control EEPROM
Alarm alarm
Firmware WDT (Watch
Detection Dog
Alarm Timeout)
alarm
Firmware NMI signal
Detection
alarm
Alarm
Firmware
BRK
Detection
instruction
Alarm
alarm
Serial MPU internal
Interface RAM alarm
Alarm
Serial ROM alarm
Interface
Alarm
Serial RAM on I/F
Interface board alarm
Alarm
Serial I/F not
Interface mounted
Alarm
X = LED Blink (200ms ON, 200ms OFF)
All other LED Displays: = LED lights up
Alar LED Remarks
m Display
X 10 Read/write
error
X 15 Check sum
error
X 20 No reaction
when MPU
reads data
X 15, No reaction
NLQ when MPU
reads data
X 17 MPU is
locked up
and it is
reset after
65ms.
X 17, NMI port of
HSD MPU is kept
low level.
X 17, UTL FFFF data is
detected due
to MPU
locked up.
X 10, Read/write
HSD error
X 15, Check sum
HSD error
X 20, Read/write
HSD error
X 12, No reaction
HSD from serial
I/F board
Troubleshooting
Replace Control/Power
Supply Board
Replace ROM or
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
Control/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 of
Control Board