Notes On Printing 2-Dimensional Code; Two-Color Printing; Operating Mode (Switch Panel Operation); Self-Test Mode - Epson TM-T88IV Technical Reference Manual

3.7 Notes on Printing 2-Dimensional Code

The TM-T88IV supports 2-dimensional code printing. Be sure to follow the notes below when
printing 2-dimensional codes.
• When printing PDF417 (2-dimensional code), it is recommended to set the height of one
module of the symbol to three to five times the width of one module, also making sure
that the total height is almost 5 mm {0.20"} or more.
• The recognition rate of the 2-dimensional code may be affected by such items as
different widths of the modules, print density, environmental temperature, type of the
thermal paper, and characteristics of the reader. Therefore, the user should check the
recognition rate in advance so that the limitations of the reader can be considered.

3.8 Two-color printing

For selecting colors/how to print, see the relevant documents for OPOS, the printer driver, and
the ESC/POS commands.

3.9 Operating Mode (Switch Panel Operation)

The printer has a self-test mode to check printer settings in addition to the regular print mode.

3.9.1 Self-test Mode

In the self-test mode, the following items are checked and printed out:
• Control circuit functions
• Printer mechanism functions
• Print quality
• Control software ROM version
• DIP switch settings
Follow the steps below to start a self-test:
1. With the roll paper cover open, press and hold down the FEED button and turn on the
printer. The printer prints various printer settings.
2. When the printer finishes printing the printer status, check whether the following message is
printed (The printer is now in the self-test wait mode.) :
3. To start a test print, press the FEED button while the printer is in the self-test wait mode.
4. Check that the following has been printed:
This indicates that the printer has been initialized and returned to the normal mode.
Rev. A
"If you want to continue SELF-TEST printing.
Please press PAPER FEED button"
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TM-T88IV Technical Reference Guide
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Application Development Information 3-13