Sony PCG-Z1WAMP1 - Manual (Page 83)

Disconnecting a printer
You can disconnect the printer cable when the computer is on or off. Disconnecting a printer when the computer is in a
power saving mode (Standby or Hibernate) may cause the computer to malfunction.
To disconnect a printer
1. Make sure all print jobs are completed.
2. Unplug the printer cable from the computer.
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