Troubleshooting

Common to Windows and Mac OS X

Cause	Solution	Reference
An unsupported USB cable is used.	Use a USB 2.0 cable.	-
A USB hub is used.	Directly connect the machine to the computer.	Connecting a USB Cable
A printer driver is not installed correctly.	Reinstall the printer driver.	Installing a Driver and Software to a Computer

For Windows

Cause	Solution	Reference
The machine is offline.	Right-click the [OKI C542 ] icon on the [Devices and Printers] folder, and then select [See print jobs] (If the icons are grouped, select [See print jobs] > [OKI C542 ]). * Indicates the driver type. (ex. PCL 6/PS/XPS) In the dialog, select the [Printer] menu and then clear the check of [Use Printer Offline].	-
A switch, buffer, extension cable, or USB hub is used.	Directly connect the machine to the computer.	Connecting a USB Cable
Another printer driver that works when connected via a USB interface is installed.	Remove the other printer driver from the computer.	-

Cause

Solution

Reference

The machine is offline.

Right-click the [OKI C542 *] icon on the [Devices and Printers] folder, and then select [See print jobs] (If the icons are grouped, select [See print jobs] > [OKI C542 *]).

* Indicates the driver type. (ex. PCL 6/PS/XPS)

In the dialog, select the [Printer] menu and then clear the check of [Use Printer Offline].

A switch, buffer, extension cable, or USB hub is used.

Directly connect the machine to the computer.

Connecting a USB Cable

Another printer driver that works when connected via a USB interface is installed.

Remove the other printer driver from the computer.

USB Connection Problems