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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
RAP 03 Printhead Homing Error
START
Printhead does not return to the home position.
Make sure the carriage cable is properly connected to the space motor assembly and CN8 on the
main control board.
Make sure the power connector cable is properly connected to CN3 on the main control board.
Does the space motor assembly move manually?
No
Remove the space motor assembly and inspect the space motor and space rack
for dirt and worn teeth.
Go to A
Yes
Are there any breaks in the carriage cable?
Yes
Replace the carriage cable assembly.
Go to A
No
Verify that ribbon feed mechanism is properly fastened to the space motor
assembly.
Go to A
A
Does the carriage move slightly to the left after turning the power on?
No
Replace the space motor assembly.
Has the problem been resolved?
Yes
End of procedure.
No
Contact Technical Support.
Yes
Replace the ribbon feed assembly.
Has the problem been resolved?
Yes
End of procedure.
