I have an old HP LaserJet 6L connected to PC running Windows 7 using USB-Centronics adapter. The printer used to worked fine when it was connected to a USB hub. Now it's connected it to directly to PC's USB port.
After rebooting the PC printing works fine, however when printer has entered standby mode (all LEDs are off) printing results in "Error - Printing" message and I have to reboot Windows.
