Brother MFC-J3520 Service Manual page 159

(30)Remove the CR timing belt from the Head/carriage unit.
Head/carriage unit
Note: When storing the removed Head/carriage unit for a long period, store the unit in
a Head casing as shown below. Leaving it out of the casing causes the head
nozzles and ink supply ports to dry up so that the Head/carriage unit can no
longer provide the original performance.
Head/carriage unit
Fig. 3-21
Latch
Fig. 3-22
3-39
CR timing belt
Head casing (upper)
Joint cap
Head joint rubber
Head casing (lower)
Confidential