Alarm/Led Display Troubleshooting Tables - Oki Microline 520 Service Handbook

%4.6.03 ALARM/LED Display Troubleshooting Tables

4.6.03 ALARM/LED Display Troubleshooting Tables
CAUTION:
Always check that all connectors on the printer are making good contact.
Reference Failure
Number Description
1 Space Motor
Alarm
2 Printhead
Detection Alarm
3 Printhead A/D
Alarm
4 Printhead Gap
Alarm
5 Printhead Data
Transfer Alarm
6 Printhead Type
Alarm
7 Printhead
Connection Alarm
(1)
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
ML520/521 ( 96-02-04 )
Cause
Space motor IPT
does not occur in
specified time.
Printhead does not
home.
Thermistor is open
or +5 vdc shorted.
Self adjustment was
not successful.
Printhead parity
error<R>was not
recovered or print
head was not seated
properly.
24 pin printhead
is connected in a 9
pin printer.
Overdrive signal
is active but no
current is
detected.
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
Recommended Action
Refer to RAP 02.
Refer to RAP 03.
Check the printhead
connection. Then
replace the main control
board the carriage cable
and the printhead.
Check the printhead
connection. Then
replace the main control
board the carriage cable
and the printhead.
Replace the main control
board the carriage cable
and the printhead.
Replace the printhead
with a 9 pin printhead.
Check the printhead
connection. Then
replace the main control
board the carriage cable
and the printhead.
Check the printhead
connection. Then
replace the main control
board the carriage cable
and the printhead.
Replace the following:
main control board
feed motor and space
motor.
Replace the main control
board.
Replace the main control
board and/or ROM.
Replace the main control
board.
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