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Service Guide ML320/ML321
Chapter 4 Failure & Repair Analysis
4.7
HEXADECIMAL DUMP
4.7.01 General Information
Hexadecimal dump mode allows you to check the data sent from the computer to the printer.
All data sent to the printer, including test and printer commands, will print in both hexadecimal
and ASCII format. In the ASCII format, all non-printable codes will be represented by a period.
4.7.02 Procedure
To place the printer in hexadecimal dump mode, follow this procedure.
1) Power OFF the printer.
2) Press and hold SEL and FORM FEED while powering ON the printer.
3) The printer will remain in hexadecimal dump mode until it is powered OFF.
4.7.03 Sample
Here is a line of BASIC code.
LPRINT CHR$(27) ;"0";CHR$(30) ;"This is an example of a hexadecimal dump."
In hexadecimal dump mode, the BASIC code line would print as follows.
1B 30 1E 54 68 69 73 20 69 73 20 61 6E 20 65 78 .0.
61 6D 70 6C 65 20 6F 66 20 61 20 68 65 78 61 64
65 63 69 6D 61 6C 20 64 75 6D 70 2E 0D 0A
This is an example of a hexadecimal dump...
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