Brother MFC620CN Service Manual page 252

6.5 IF YOU REPLACE THE CONTROL PANEL PCB
(MODELS WITH BACKLIGHTS)
Adjust the light intensity of the backlight.
Refer to Chapter 8, Section 8.5.5.
6.6 IF YOU REPLACE THE SCANNER UNIT
Reset the type of scanner unit.
Input the type of the CIS (Required for the MFC620CN*/425CN/420CN*/215C,
DCP315CN/120C/117C/115C and MFC210C U.S.A.*)
*Require only for the models with a character "Z" written on the
Rating Label affixed to the back of the machine.
Please reffer to the illustration on the right.
Refer to Chapter 8, Section 8.5.12.
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