Brother MFC-J6510DW Service Manual page 241

Assembling Note: The DX chassis is positioned with reference to the engine unit. If the engine
unit is removed and mounted
chassis again, using the following steps.
First loosen two screws "a" on the right and left ends of the DX chassis. While pressing the DX
chassis against the engine unit (to the rear), tighten those screws. Next, loosen screw "b" on the
belt tension adjuster, adjust the adjuster vertically to apply appropriate tension to the SB timing
belt, and then tighten the screw.
Engine unit
SB timing belt
"b"
Belt tension
DX chassis
adjuster
(Section 3.9.17), therefore, it is necessary to position the DX
DX chassis
DX star wheel plate ASSY
"a"
3-116
"a"
Lower cover
DX star wheel plate ASSY
"a": Taptite, cup B M3x10
"b": Screw, pan (s/p washer) M3x5DB
(3_085)
Confidential