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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
4.8 PRINTER TESTS
4.8.01 General Information
This section covers the tests listed below.
1. Rolling ASCII Test
2. Font Test
3. Serial Interface Loopback Test
4. Hexadecimal Dump Mode
5. The Rolling ASCII and Font Tests check print operations.
6. The Serial Interface Loopback Test checks the operation of the serial interface board.
7. The Hexadecimal Dump Mode checks the data transfer between the computer and
printer.
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