Oki ML520 Service Manual page 188

8 Printhead
Connection Alarm
(2)
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
CAUTION:
Always check that all connectors on the printer are making good contact.
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Self adjust was not
successful. Head gap is
too small or too narrow.
High driver temperature.
The TSD signal has not
changed.
Read/write error
Check sum error
Read/write error
Check sum error
Check the printhead
connection. Then
replace the main control
board the carriage cable
and the printhead.
Replace the following:
main control board line
feed motor and space
motor.
Replace the main control
board.
Replace the main control
board and/or ROM.
Replace the main control
board.
Replace the main control
board.