Epson 10600 Printer Manual page 88

Note
If you're using stock
more than 39 inches
long, load it long edge
first (in landscape
orientation).
4. Pull the paper set lever out, to the released position. Then open the
lower cover. (The cover has tabs that support the posterboard.)
5. Feed the posterboard into the paper slot until it meets resistance.
6. Align the board with the scale on the roll paper cover.
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Using Paper and Other Media | 2-21