Speckling on printed pages in laser printers is very often due to a defective toner cartridge or an issue with the toner's distribution. Replacing or checking the cartridge should be the first step, as it's the most common cause and the simplest to resolve. Checking for the correct paper type is applicable when dealing with issues like paper jams or poor print quality related to incompatible paper. Wieiping off external debris from the machine may help but it often does not affect internal printing defects. Adjusting printer settings could resolve software-related issues or incorrect output formats but is less likely to address physical defects on the printed output such as speckling.