Brother International HL 1240 Service Manual - Page 186
Appendix 20. High-voltage Power Supply PCB Circuit Diagram
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Appendix 20. High-voltage Power Supply PCB Circuit Diagram 0V +24V 2 +24V 7 CHG 3 0V DEVCH 5 DEV2 DEV1 4 TRANSFF 1 TRANSCH1 TRANSFB 2 TRANSCH2 1 6 R1 R2 R35 R21 R90 R92 Q83 D109 R129 R115 R125 R124 R123 Q102 R134 R127 R126 R105 VR101 R104 C101 R106 C108 R102 C102 R128 R107 D101 C107 Q101 R108 D103 R131 R130 R133 R132 C103 C105 C104 C106 Q103 R113 R112 R121 D108 R120 R122 R110 R109 D110 D104 B101 R88 R103 IC81 R114 R93 R95 R94 D81 R85 R86 C81 R101 C87 R84 R82 Q82 R83 D85 R91 R87 C82 C83 D86 Q81 R89 D84 D83 R100 R99 R98 R97 C109 R96 C85 C84 D87 D88 D111 T / R R81 C86 B102 R51 VR51 Z51 GRID R22 R24 R33 Q21 R23 R32 R31 Q28 R26 R27 C22 R25 Q29 Q22 R36 VR21 C21 R34 PC21 C25 R43 VR22 R44 R45 R46 R47 R48 R49 D25 D24 C26 Q24 Q25 Q26 Q27 D23 C28 R9 R8 D1 R5 R6 R3 Q6 R4 R7 R11 R10 C2 Q3 Q5 R12 C5 C3 D2 + C4 D4 D5 R17 Q4 R15 Q1 R13 Q2 R14 R16 R18 + C1 D3 DB1 RB1 DB2 CB2 CB1 RB2 B1 CHG DEV R50 NAME High-voltage PS Circuit A - 28