Brother MFC8420 Service Manual page 146

(3) Remove the three pan M3x6 screws.
(4) Remove the five cup S M3x6 Taptite screws, and then remove the main PCB ASSY.
Screw, pan
M3x6
Taptite, cup S M3x6
NOTE:
After replacing the Main PCB, please perform the following operations.
•
APPENDIX 1
•
APPENDIX 2.1
•
APPENDIX 2.2
•
Chapter 7 3.12
Taptite, cup S M3x6
Fig. 4-115
EEPROM CUSTOMIZING CODES (Refer to A-1.)
INSTALING THE UPDATE DATA TO THE MACHINE (Refer to A-3.)
SETTING ID CODES TO MACHINES (Refer to A-5.)
CCD Scanner Area Setting (Maintenance mode 55) (Refer to P7-20.)
4-65
MFC-8420/8820D/8820DN, DCP-8020/8025D/8025DN
Main PCB ASSY
SERVICE MANUAL