OKIDATA MICROLINE ML590, Service Manual

Page: 219 / 305

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