Panasonic KX-MC6020C Operating Instructions Manual page 60

9. Programmable Features
Feature/Code
Changing the colour
calibration for yellow colour
{#}{4}{8}{8}
Changing the colour
calibration for black colour
{#}{4}{8}{9}
60
Selection
Change the colour calibration if colour printing is too dark or too light. See page
77 for details.
Change the colour calibration if colour printing is too dark or too light. See page
77 for details.