Brother MFC-J2320 Service Manual page 132

(11) After completion of reassembly, it is recommended that the dielectric voltage
withstand test and continuity test be conducted.
(12)Before packing the machine for sending it back to the user after repairs, be sure to
clean the flushing guide with a cleaner stick as shown below to prevent ink
splashing during transportation.
Flushing guide
3-2
Cleaner stick
Confidential