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Service Guide ML590/ML591
Chapter 4 Failure & Repair Analysis
4.8.05 Hexadecimal Dump Mode
General Information
The hexadecimal dump mode allows you to view the data sent from a computer to the printer.
When the printer is in hex dump mode, all data received (both printable characters and control
codes) will be printed in both hexadecimal and ASCII format.
NOTE:
In the ASCII format, all non-printable characters will be represented by a period.
Example
Below is a line of BASIC code.
LPRINT CHR$(27) ;"0";CHR$(30);"This is an example of hexadecimal dump."
Below is the same line as it would appear in Hexadecimal Dump Mode.
1B 30 1E 54 68 69 73 20 69 73 20 61 6E 20 65 78 .0.
61 6D 70 6C 65 20 66 20 61 20 68 65 78 61 64
65 63 69 6D 61 6C 20 64 75 6D 70 2E 0D 0A
Procedure
Follow these steps to engage the Hexadecimal Dump Mode.
1. Make sure the printer is connected to a computer.
2. Verify that paper is loaded.
3. Verify that the ribbon and printhead are correctly installed.
4. Power
OFF
the printer.
5. Press and hold the
SEL
and
FF/LOAD
switches while powering on the printer.
6. Hold the switches until the printer prints the line:
7. Hex Data Dump
8. The printer is ready to receive data in the Hexadecimal Dump Mode.
9. Send data to the printer from the computer.
10. To exit Hexadecimal Dump Mode, power
OFF
the printer.