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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
4.4.03 START HERE Flowchart
START
Power ON the unit.
Does the printer initialize?
No Is the ALARM Lamp Blinking?
No Refer to RAP 01.
Yes Refer to Section 4.6 of the Service Handbook.
Yes Load the printer with paper.
Does the paper load without jamming?
No Refer to RAP 04.
Yes Perform the Rolling ASCII test. Refer to Section 3 of the Service Handbook.
Is the output satisfactory?
No Refer to RAP 06.
Yes Are all operator panel switches operating properly?
No Refer to RAP 09.
Yes Has the problem been resolved?
Yes End of procedure.
No Does the parallel or serial interface port receive data from the host PC properly?
Yes End of procedure.
No Which port is not receiving data?
Parallel Refer to RAP 10.
Serial Refer to RAP 11.
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