Rice Lake Okidata 320-390-420 Turbo - Service Guide - Manual (Page 110)

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