Brother TD-4000 Service Manual page 57

(5) Remove the two screws to remove the chassis R sub ASSY from the sub plate.
(6) Remove the two screws to remove the chassis L sub ASSY from the sub plate.
Screws
Chassis L sub ASSY
(7) Remove the head plate from the sub plate.
Sub plate
Figure 3.4-40 Disassembling the Mecha ASSY (3)
Sub plate
Figure 3.4-41 Disassembling the Mecha ASSY (4)
Chassis R sub ASSY
Head plate
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Screws