Brother MFC-J3520 Service Manual page 156

(21)Remove the Head joint rubber from the Head/carriage unit.
Head/carriage unit
(22)Move the Head/carriage unit slightly in the direction of the arrow and remove the
Resin retaining ring from the Idle pulley.
(23)Remove the Idle pulley from the CR frame ASSY.
Note: Be careful not to lose the Washer which easily comes off from the Idle pulley.
Resin retaining ring
Idle pulley
CR timing belt
CR frame ASSY
Bosses
Fig. 3-15
22b
22a
Fig. 3-16
3-36
Washer
Head/carriage unit
Head joint rubber
Confidential