Apple Color LaserWriter 12/600 PS - Manual (Page 102)

IMPORTANT If you have the same size paper in your paper cassettes and
multipurpose tray and have tray switching turned on, the printer may draw
paper from any paper source that has the correct size paper (even if you
select a specific paper source from the Print dialog box). If you want to print
from a specific paper source only, do not select “Switch to another cassette
with same paper size.”
1 Choose Print from the File menu.
The Print dialog box appears.
2 Choose Error Handling from the Settings pop-up menu.
The Error Handling dialog box appears.
3 Make the selections you want.
4 When the selections are as you want, choose another setting from the Settings pop-up
menu, or click Print.
88 Chapter 5