1, first check the connection problem, for example, type: dir & gtPrn to test whether there is any problem with the printer connection. If you can't print or print garbled code, replace the cable in time.

2. To check whether the driver is normal, you need to print a test page to check whether there is anything wrong with the driver. If it is not normal, click = > from the control panel to add or delete the current driver, and then reinstall it; If the printing is normal, proceed to the third step.

3. Change the print interface settings under WindowsXP as follows: Start => Settings => Control Panel = & gtSystem => Device Management = & gtPort => Double-click LPT option => Select Driver => Select Upgrade Driver = & Gt Select to display a list of all drivers in the specified location, so that you can select the required drivers from the list => Select to display all devices => Select the standard port type in the manufacturer options and the printer port in the model options => Follow the instructions on the screen to do the following.