Brother TD-4000 Service Manual page 78

(5) Insert the two hooks "A" of the front cover into the holes of the cutter unit ASSY.
(6) Hang the hook "B" of the front cover on the under cover.
(7) Secure the front cover and the under cover with the two screws.
Under cover
Hook "B"
Front cover
Figure 3.5-24 Installing the Front Cover (1)
NOTE: Put the cover sensor arm L into the gap between the cutter unit ASSY
and front side cover before assembling the front cover.
Cover sensor arm L
Front side cover
Figure 3.5-25 Installing the Front Cover (2)
Taptite, bind B M3 x 8
Cutter unit ASSY
III - 53
Hooks "A"
Front cover
Cutter unit ASSY