Brother HL-3040CN Service Manual page 237

(5) Remove the TC arm spring L from the Top cover arm L.
<Left side>
Assembling Note:
The TC arm spring L and TC arm spring R are different parts. Make sure to assemble the
spring with a red line on its side to the L side.
Red line
TC arm spring L
TC arm spring L
Hook
Fig. 5-56
Fig. 5-57
5-63
Hook
Top cover arm L
TC arm spring R
Confidential