Color LaserWriter 12/600 PS: Use Printer Pantone Files For Correct Color

I am printing to a Color LaserWriter 12/600 PS from Quark Xpress using Pantone colors. Unfortunately, my printouts DO NOT match some hard copy Pantone swatches that I have. I have printed out the raw PostScript file that came on the "Pantone files for the Color LaserWriter 12/600" disk, and the colors that printed more or less match my Pantone swatches.

Why can I not get my Quark Xpress files to match? Can I change the density settings in the back of my Color LaserWriter 12/600 PS so I get a better match?
Quark Xpress, like most of the other high-end graphic applications, have their own Pantone color tables you can use. These color selections SHOULD NOT be used when printing to the Color LaserWriter 12/600 PS or Color LaserWriter 12/660 PS printers since they are "tuned" only for monitors. The application-specific files provided on the Pantone disk for the Color LaserWriter 12/600 PS are the correct files to use since they provide Color LaserWriter 12/600 PS-specific CMYK values.

With regard to any changes that can be made in the Color LaserWriter 12/600 PS for color, with the exception of the Density Control Panel at the back of the printer, there are none. We would suggest leaving all of the colors as neutral, unless as the manual says:

"There are always small variations in color between different printers. If you have two Color LaserWriter printers on the same network, you can use the density control panel to make subtle changes to match the two printers."
Published Date: Feb 19, 2012