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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
4.6.03 ALARM/LED Display Troubleshooting Tables
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
main control board carriage
cable printhead
4 Printhead Gap
Alarm
Self adjustment
was not
successful
Check the printhead
connection then replace the
main control board carriage
cable printhead
5 Printhead Data
Transfer Alarm
Printhead parity
error
Replace main control board
carriage cable printhead
6 Printhead Type
Alarm
9 pin printhead is
connected in a
24 pin printer
Replace the printhead with a
24 pin printhead
7 Printhead
Connection Alarm
(1)
Drive current is
detected during
no overdrive
signal
Check the printhead
connection then replace
main control board carriage
cable printhead
8 Printhead
Connection Alarm
(2)
Overdrive signal
is active but no
current is
detected
Check the printhead
connection then replace
main control board carriage
cable printhead