Slow printing suddenly printer is printing a a very slow rate

Remove both cartridges, switch off printer and then on. After cartridge holder comes to the center install both the cartridges. Then it will print the Alignment page. After alignment page prints place the Alignment page on to the scanner and press SCAN button as mentioned in the Alignment page. After completing the scan try printing. It will print the usual speed.
Note: For the alignment process both cartridges should in good working state