Monarch Instrument 9403TM - Manual (Page 44)

Correct contrast setting is important because it affects how well
your bar codes scan and how long your printhead lasts. You can
use a verifier to check bar codes for contrast.
1. From the Main Menu, press L or R until you see
MAIN MENU
l Setup r
2. Press E. You will be at the Setup menu. Press L or R
until you see
SETUP
l Contrast r
3. Press E. You will see the current setting, for example:
Enter contrast
[-390/156]: +0
4. Use the arrow keys to change the contrast. Pressing R
darkens the print; L lightens the print.
Press the arrow key once to change one number at a time.
5. Press E to select the displayed value. Press e to exit
to the Main Menu.
6-2 Setting Contrast