Sony VGC-RC300 - Manual (Page 79)

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Using Peripheral Devices
Connecting a Printer Using the Printer Port
To connect a printer using the printer port
1 Plug the printer power cord (1) into an AC outlet.
2 Plug the printer cable (2) supplied with your printer into the printer port (3) on the back of the computer.
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Before connecting the printer, turn off the computer and the printer, and unplug the AC adapter and the power cord.