This is due to the dusty mirror inside the laser box.
1. Switch OFF the printer and remove the back cover.
2. Then carefully remove the connector and label them with some ID's to put it back in same positions.
3. Remove the Cable & Cable trays. Then remove the screws of the PCB frame carefully.
4. Now you will be able to see the laser box. Remove the screws of the laser box and take it out.
5. There is screw at the center of the box. Remove and open the box. You will be seeing the mirrors inside the box.
6. Using the cotton buds, clean the mirrors carefully without damaging them.
7. Reverse all the steps above and test you print.
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