It sounds like the printer is defaulting to CD print mode because it doesn’t recognize the PVC tray correctly. To fix this, make sure you've selected the right media type (like "Plastic" or "PVC") in the printer settings. Also, check that the tray is inserted properly and aligned according to the printer’s instructions. Ensure your printer driver is up to date and configured for printing on plastic cards. This should help the printer recognize the PVC cards and print them correctly.