Ricoh CL3500N Maintenance Manual page 66

Cleaning and Adjusting the Printer
❒ Hold the correction value (0-6) for "K" of the correction value setting sheet
over the color sample of gradation correction 1 of the Color Calibration
Sample Sheet and search for a corrected color closest to that of the color
sample, and then set its correction value using the operation panel. The
currently set correction value is printed in red.
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