Canon BJC-3000 - Manual (Page 43)

43 Printing on Paper and Other Media
Using Plain Paper or High Resolution Paper
1
Make sure that the printer is switched on and the paper thickness lever is
set to the Up position. Raise the paper rest as shown in the figure.
When you are using plain paper for printing, the print side of the paper may
be scratched and stained if the paper is thick. In this case, set the paper
thickness lever to the Down position.
Switching the Printer On
Paper thickness lever
Paper rest
Paper output tray