I am new to this site, but I want share my experience on this site. Actually, I got the problem with HP Laserjet 2420 in that The problem I am unable to print properly I asked the one technique he suggested me once re-install the driver. I did what he said. Now my printer is working very good. If you have any problem with your printer better re-install and check your printer it may work better...
HP Laserjet 1020 Printer Driver Downloading and Installation Guide
HP Laserjet 1020 printer driver
download and install you must click on Free Download.
After it is downloaded on your system open the file and continue the installation process accordingly.
You can read the manual that comes with the driver software on how to use, operate and use the features of driver software.
Once it is all set up accordingly, you will be able to use your printer efficiently without any problems, as the driver will recognize all inputs and drivers to work properly in all circumstances.