Authors' Note: When referring to "beyond CMYK+PK", I am referring to color sets such as CMYK+PK+GR, CMYK+PK+GR+Gloss Optimizer, CMYK+PK+GR+OR+Gloss Optimizer to name a few "common" combinations I have seen.

For printers with colors beyond CMYK+PK, a more advanced test sheet that fully tests the printhead on these models is REQUIRED. I am not providing this. Consider using a reference photo set commonly used by photo labs or a photo you have taken personally on a high-end camera like the Sony Alpha series to test your printer.

All ink cartridges must have ink left. If all else fails, add ink with a DYE OR PIGMENT BASE refill kit (Check your printer specs; getting this wrong leads to binding and permanent damage). Add ink to ANY low cartridge(s). FAILURE TO DO THIS MAY DAMAGE YOUR PRINTHEAD AND TOTAL OUT YOUR PRINTER.

If you have a photo printer such as a 5-color model (CMYK+PK), print the test image as a photo program such as Photoshop, Photos (Mac) (or your preferred image viewer), forcing it to print in photo mode.

After replacing the printhead, test the printer. Match the previous settings and check for improvement.