What laser scanner units do
The scanner or LED head writes the latent image onto the drum. On laser machines a polygon mirror and lens assembly scan the beam; on LED machines a row of emitters writes the line directly.
How to identify the right part
Match the unit to the machine and to the colour position — on colour machines heads are not interchangeable between colours. Check the window for dust before replacing an entire unit.
Signs a replacement is due
One colour missing or weak, thin white lines running down the page, banding, or a scanner/LSU error code.
Grades available
Parts in this category are offered in several grades, and the grade is stated on every product page. Genuine and OEM parts are made by the original manufacturer, identical to the part fitted at the factory. Compatible parts are third-party replacements built to OEM dimensions and function, which is where most of the cost saving sits. Remanufactured and OEM-pull parts are original assemblies that have been cleaned, reconditioned and tested. The part number and compatible machine list are shown for each item so the grade can be chosen against the job, not against the picture.
Finding the part number
The fastest way to identify a copier part is by its manufacturer part number rather than by description. Numbers printed on the old part, in the service manual parts list, or on the machine’s consumables label will match a product in this category directly — search the number, or open the machine’s model page and find it there. Where a manufacturer supersedes a number, the superseded value is listed with the product so an older number still finds the right part.