My scanner fails to scan documents. It either generates a "warming-up" message OR "sorry, scanner could not be initialized. (Scanner parameter error.)" message.

There are many users facing this same error message.
there are options to solve the issue.the upper part of the printer is scanner.you have to remove that upper portion by removing the screws and internal locks on its inner layer.then check out if any dust is got collected on the scanner lens.the lens is a thin glass layer in the scanner that reads the document which you place on the glass.if the dust gets collected on the lens it will show this error messages.but if after cleaning it shows same message that means the internal board is got faulty.there is a mini circuit board beside the scanner glass.internally.so the upper scanner assembly needs replacement.in the scanner assembly set you get the new circuit board.scanner assembly means not the upper scanner glass it only includes the inner assembly and the circuit board of scanner assembly.the cost of new assembly is near to $40.you can get this assembly at any local printer repair shop.they have it in spare or they can easily get it from nearest service center of the hp company.
thanks.