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Service Guide ML520/521
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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