3.To end the self test, press the Pause button to stop printing. If paper remains in the printer, press the Load/Eject button to eject the printed page. Then turn off the printer.

cCaution:Do not turn off the printer while it is printing the self test. Always press the Pause button to stop printing and the Load/Eject button to eject the printed page before you turn off the printer.

Printing a Hex Dump

The hex dump feature is designed for DOS-based PC connections. If you are an experienced user or a programmer, you can print a hexadecimal dump to isolate communication problems between the printer and your software program. In hex dump mode, the printer prints all data it receives from the computer as hexadecimal values.

You can print a hex dump using either single sheets or continuous paper that is at least 210 mm (8.3 inches) wide, such as A4 or letter size paper.

1.Make sure paper is loaded and the printer is turned off.

2.To enter hex dump mode, turn on the printer while holding down the LF/FF and Load/Eject buttons.

3.Open a software program and send a print job to the printer. Your printer prints all the codes it receives in hexadecimal format, such as:

By comparing the characters printed in the right column with the printout of the hexadecimal codes, you can check the codes the printer is receiving. If characters are printable, they appear in the right column as ASCII characters. Nonprintable codes, such as control codes, are represented by dots.

4-18Troubleshooting