We have problem with photo copy canon IR2016 copying black and white papers

Regarding pick-up error "change paper size"or "incorrect paper size" while copy/print:

These may do the trick:

Point of problem:
Paper Pick-Up Assembly
Problem:
Prevention of incorrect Paper Size Error or Pickup Assmbly Delay Jam (0104) upon Cassette Pick-up

Behaviour of copier:
When making a pick-up setting as from the Cassette and starting Copy, "incorrect paper size" error or pick-up delay
jam (0104) may occur.

Possible reason:
When considerable amount of Paper Lint is attached onto the Vertical Path Roller , the feeding power is
undermined and the paper feeding is delayed, resulting in "incorrect paper size" error or "pickup assembly delay"
jam.




Servicing work:
When the foregoing symptom occurs, be sure to replace the 27T/50T Gear [old type] with the 33T/50T Gear [new
type] and the 29T Gear with the new type simultaneously.

Affected machines are:

iR2016J 120V KQW00838 and later iR2020 230V KRS02060 and later
iR2016J EUR 230V KQX19105 and later iR2020i 120V SRB03779 and later
iR2016J 230V KQY08575 and later iR2020i EUR 230V SRC03634 and later
iR2016 EUR 230V KRB61503 and later iR2020i 230V SRE00245 and later
iR2016J EUR 230V TXK10815 and later iR2016i 120V SRH01205 and later
iR2016 120V KRE05112 and later iR2016i EUR 230V SRJ04494 and later
iR2016 230V KRJ07227 and later iR2016i 230V SRL00298 and later
iR2020J 230V KRM01592 and later
iR2020 EUR 230V KRP16433 and later
iR2020 120V KRR07615 and later