IBM Personal Computer AT Manual To Operations page 158

Setting the Left Margin
When the left tractor is set as far left as possible, your
printer will start your lines 25.4 mm (1 in.) to the right
of the left side of the paper. If you want to start your
lines farther to the right, see "ESC X" under "Printer
Control Codes." If you want to print closer to the left
r".
side of the paper, follow this procedure.
1
Turn your printer's power off.
2
Open the printer access cover.
3
With continuous paper or forms installed, unlock
both tractors by pushing the Tractor Lock levers
down.
4
Slide the tractors and paper to the right the
distance you want to move the left margin.
5
Lock both tractors in place by pushing the
Tractor Lock levers up. Make sure the tractors
are set so the paper lays flat between them.
6
Close the printer access cover.
7
Turn your printer's power on.
1-48 Color Printer