Oki Microline 3390 User Manual page 117

Chapter 8: Troubleshooting
8-6
Major faults
The following fault messages are unlikely to be displayed in normal
use. They are listed here for the sake of completeness. Should any of
these faults occur, contact your supplier.
The ALARM lamp also blinks when these faults occur; the follow-
ing lamps light permanently in addition.
10 cpi 15 cpi 17 cpi 20 cpi PROP
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UTL PRES BOLD
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Cause
MPU, internal RAM
Program ROM
RAM
internal character
generator
EEPROM
Firmware time moni-
toring
Firmware NMI signal
Firmware BRK com-
mand
Serial interface card,
MPU, internal RAM
Serial interface card,
ROM
Serial interface card,
RAM
Head positioning
Print head gap
Print head contact
LF/space motor,
driver