What should I do if the ET-3850 is printing faint or has gaps in the printout?

This is typically a print head issue. Run a nozzle check by selecting the nozzle check option from the control panel or computer utility to identify clogged nozzles. If needed, perform print head cleaning using the control panel (Settings > Maintenance > Print Head Cleaning) or the computer utility. If cleaning doesn't resolve the issue, try power cleaning for a deeper clean.