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Service Guide ML520/521

Chapter 4 Failure & Repair Analysis

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<R>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.

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OKI ML521 Bedienungsanleitung Seite 187

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