Brother MFC-J3520 Service Manual page 189

(3) Turn the Document scanner base ASSY right side up.
(4) Lift up the rear side of the Document scanner top cover as shown in the figure.
Release the six Hooks at the front side and remove the Document scanner top
cover from the Document scanner base ASSY.
<Rear>
Document scanner base ASSY
(5) Take off the two CIS roller holders from the First side CIS unit.
(6) Disconnect the First side CIS flat cable from the First side CIS unit and remove the
First side CIS unit from the CIS carriage.
Note: Be careful not to lose the CIS spring when removing the First side CIS unit.
CIS roller holder
Pin
First side CIS flat cable
CIS spring
6b
4b
4a
Fig. 3-71
5a
6a
6c
Fig. 3-72
3-69
Document scanner top cover
Hooks
Hooks
Hooks
<Front>
First side CIS unit
5b
CIS carriage
CIS roller
holder
Pin
CIS spring
Confidential