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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
4.1.02 Printer Serial Number Identification
To identify the revision level of a printer, record the serial number from the back of the printer.
Refer to the following to decode the serial number.
Example Printer Serial Number: 401A0154693
Date Code 401 (4 = year. 01 = month)
Revision: A
Serial Number: 0154693
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