Printer MX920 - printing crooked lines

[aafable]

My printer keeps printing crooked lines instead of straight ones.

I tried aligning the header automatically and manually but it still prints like this. I noticed that it would print like this if it is being printed on my computer via wifi, but when I print it using AirPrint on my phone it would be straighter (it's not straight either but it's straighter). Is this the fault of the wifi connection, the printer, or my laptop? Any help would greatly be appreciated!

[BillS]

Hi aafable,

Many print quality issues can be resolved by cleaning the encoder (timing) strip.  I have included full instructions for cleaning the encoder HERE.  Both front and back of the encoder should be cleaned.

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[Naida]

I have same issue, were you able to fix your problem ???