This is posted as one method of resolution, not as a question.
SUMMARY
Symptom: No color printing to Xerox Phaser 8560 DN:
Fix: Delete packages of all related printers and packages and reinstall
color printer first, using Windows 7 offered driver
DETAILS
A network with Xerox Phaser 8560DN color and Xerox 3250 B&W
Windows 7 Enterprise laptop
Xerox 3250 (B&W) was installed first and worked fine.
8560DN installed later.
All fields and screens visible on the laptop say color.
The Windows Printer Test Page says Color Support: No
Mostly but not all printing was B&W. Some other paging problems.
Resolution
Windows 7
Print Management
Delete all Xerox printers
Delete all Xerox print driver packages.
This required a reboot and repeat to get things "in use"
Installed 8560DN in this way
Special port
TCP/IP device
Auto query device type
Install the offered driver (8560DN PS)
Now Windows Printer Test Page says Color Support: Yes
and color prints correctly, and pages are laid out correctly.
All other unfortunate symptoms, including tray usage, page layout
and other behaviors that were occuring that are now OK.
It appears that there is some overlap
or conflict between different drivers or configurations.
Before the delete-everything method, I had tried many combinations of
PCL and PS drivers from Windows 7, from Windows Update, and from
the Xerox web site.
Many thanks to the person who mentioned deleting the packages
after deleting the printers (on some thread, somewhere). Deleting just
the printers does not do much.
