Brother MFC-9420CN Service Manual page 364

APPENDIX 6. CIRCUIT DIAGRAMS
This appendix provides the circuit diagrams of the NCU PCB and power supply PCB.
A. NCU PCB (U.S.A. model)
NCU PCB (Europe, Oceania, Asia model)
NCU PCB (Japanese model)
B. Power Supply PCB 100V, 127V
Power Supply PCB 240V
MFC-9420CN
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