OKIDATA ML590 Service Manual page 219

9 Line Feed / Space
Motor Driver
Alarm
10 MPU Internal
RAM Alarm
11 Program ROM
Alarm
12 RAM on Main
Control Board
13 CG ROM Alarm
14 EEPROM Alarm
15 Watchdog
Timeout Alarm
16 NMI Signal Alarm
17 BRK Instruction
Alarm
18 MPU Internal
RAM Alarm
19 ROM alarm
20 RAM on I/F board
alarm
21 Interface not
connected
22 Paper End Alarm
High driver Replace the following: main
temperature the control board linefeed motor
TSD signal has space motor
not changed
Read/write error Replace the main control
board
Checksum error Replace the ROM and / or
main control board.
Read/write error Replace the main control
board
Checksum error Replace the main control
board and/or CG ROM
No reaction when Replace the main control
the MPU reads board
data
MPU hung up Power OFF then ON
NMI port of MPU Replace the main control
kept low board
FFFF data Replace the ROM on the
detected due to main control board
MPU hang up
Read/write error Replace the interface board
Check sum error Replace the interface board
Read/write error Replace the interface board
then the main control board
Serial interface Replace the interface board
board not replace the main control
detected
From the cut Check paper supply.
sheet feed or
to RAP 04
bottom feed
paper end
Refer