Copies too light

[JJJ41]

The printed copies on our laserjet 1300 have become light, and are still light after a print cartridge replacement.   We have Windows 10 and it worked fine with this program until recently.   No light-dark settings are available under the Printer Preferences tag.  

[Valsimot]

What about Demo page is it printer normally or light. That will eliminate the printer from the computer/driver issue.

To print a Demo page press and hold GO button on the printer for a few seconds when lights start to blink release button.

If the demo page is printed light then the most common cause is dirty laser optics, if the demo page is printed fine then your problem is the print driver/windows update.

[JJJ41]

Thanks so much Valsimot!  The demo page printed light as well.   How can you clean the laser optics?    Thanks-