The D25 DP-9000 color check diagnostic allows you adjust the instrument readings based on readings of the blue and yellow tiles. This may be required after a lamp change or if the lamp intensity is beginning to decrease due to age.
Click here for instructions on performing the color check and adjusting the instrument readings.
If the values cannot be adjusted to within the specified range after following the color check instructions, clean the standard tiles as described here.
If the instrument still cannot be adjusted satisfactorily, instrument service may be required.
If additional assistance is required, you may contact HunterLab.