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Service Guide ML520/521
Chapter 4 Failure & Repair Analysis
4.8 PRINTER TESTS
4.8.01 General Information
This section covers the tests listed below.
Rolling ASCII Test
Font Test
Serial Interface Loopback Test
Hexadecimal Dump Mode
The Rolling ASCII and Font Tests check print operations.
The Serial Interface Loopback Test checks the operation of the serial interface board.
The Hexadecimal Dump Mode checks the data transfer between the computer and printer.
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