4.6.03 ALARM/LED Display Troubleshooting Tables
CAUTION:
Always check that all connectors on the printer are making good contact.
Reference
Number
Failure Description Cause Recommended Action
1 Space Motor Alarm Space motor IPT does not occur
in specified time.
Refer to RAP 02.
2 Printhead Detection Alarm Printhead does not home. Refer to RAP 03.
3 Printhead A/D Alarm Thermistor is open or +5 vdc
shorted.
Check the printhead connection.
Then, replace the main control
board, the carriage cable, and
the printhead.
4 Printhead Gap Alarm Self adjustment was not
successful.
Check the printhead connection.
Then, replace the main control
board, the carriage cable, and
the printhead.
5 Printhead Data Transfer Alarm Printhead parity error
was not recovered or print head
was not seated properly.
Replace the main control board,
the carriage cable, and the
printhead.
6 Printhead Type Alarm 24 pin printhead is connected in
a 9 pin printer.
Replace the printhead with a 9
pin printhead.
7 Printhead Connection Alarm (1) Overdrive signal is active but no
current is detected.
Check the printhead connection.
Then, replace the main control
board, the carriage cable, and
the printhead.
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.
Failure Analysis 4 - 20 Microline 520/521 Service Handbook
P/N 59257803
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