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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
RAP 05 Printhead Pins Not Firing
START
Missing dots on output.
Verify that the printhead gap is set correctly.
Ensure the carriage cable is making firm contact with CN7 on the main control board and the space motor
assembly. Inspect both ends of the carriage cable for worn edges.
Has the problem been resolved?
Yes End of procedure.
No Replace the printhead.
Has the problem been resolved?
Yes End of procedure.
No Replace the main control board
Has the problem been resolved?
Yes End of procedure.
No Replace the carriage cable.
Has the problem been resolved?
Yes End of procedure.
No Replace the space motor assembly.
Has the problem been resolved?
Yes End of procedure.
No Contact Technical Support.
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