Oki ML520 - Manual (Page 188)

8 Printhead
Connection Alarm
(2) Self adjust was not
successful. Head gap is
too small or too narrow. Check the printhead
connection. Then
replace the main control
board the carriage cable
and the printhead.
9 Line Feed / Space
Motor Driver Alarm High driver temperature.
The TSD signal has not
changed. Replace the following:
main control board line
feed motor and space
motor.
10 MPU Internal RAM
Alarm Read/write error Replace the main control
board.
11 Program ROM
Alarm Check sum error Replace the main control
board and/or ROM.
12 RAM on Main
Control Board Read/write error Replace the main control
board.
13 CG ROM Alarm Check sum error Replace the main control
board.
CAUTION:
Always check that all connectors on the printer are making good contact.
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