pixma 5550 prints skewed (waving) letters in black

[csirogeza]

Dear Community,

My canon printer has started to behave as I have mentioned above in the subject. Weirdly enough, it does not skew anything, when I use only one colour. I have run all alignment utilities, I have cleaned the encoding ribbon with soap, the problem sill persist. If I print a vertical line in black, the result is this:

I am sorry for the bad picture quality.

I would really appreciate your help. Thanks a lot.