Getting error - 6A00 on Canon Pixma ip4000

1. Turn off the printer
2. Open cover
3. Print head and cartridges manually move to the left
4. on the extreme right is a white plastic cover is visible, which is attached to a spring
5. Clean the cover carefully (no chemicals, not wet) and gently push it back (it clicks) and remove any impurities -> the black collecting sponges for the storage of the print head can see
6. Print head and cartridges manually back to the right move
7. Turn on printer