Brother MFC-3340CN Service Manual page 154

Removing the paper ejection roller
(4) At the left end of the paper ejection roller, release the lock arm of bushing L from the hole
provided in the chassis of the engine unit and turn bushing L clockwise (viewed from the right).
At the right end, release the lock arm of bushing R from the chassis and turn it clockwise to the
horizontal position, then remove the paper ejection roller towards you.
Lock arm of bushing R
Engine unit
Lock arm of bushing R
Paper ejection roller
Lock arm of bushing L
Lock arm of bushing L
Confidential
5-56