Sony HCD-EC68P Service Manual - Page 34

HCD-EC68P/EC78P HCD-EC68P/EC78P 6-9. PRINTED WIRING BOARD - HI AMP Board (EC78P) - • See page 27 for Circuit Boards Location. • 1 2 3 HI AMP BOARD : Uses unleaded solder. 4 A E MAIN BOARD CN632 (Page 30) B JW151 JW157 JW154 R163 C159 R164 C160 CN151 1 C170 R185 R186 R183 Q151 B E D151 C175 JW152 R181 JW155 Q152 BE R184 C176 C173 R175 R176 R179 R177 R180 JW156 6 R182 1 C169 C157 R162 D152 R161 C158 2 R159 R151 R160 C151 R153 JR151JW153 R172 C166 C152 R154 R152 R155 R195 C153 C178 R156 C154 C161 C162 4 5 CN152 R178 C174 1 R171 C155 C156 R173 (EC78P: UK) (EC78P: US, CND) R196 15 14 IC151 IC152 1-875-496- (14) F MAIN BOARD CN602 (Page 30) 6-10. SCHEMATIC DIAGRAM - HI AMP Board (EC78P) - 1 2 3 4 5 6 7 8 9 A B C E D MAIN BOARD (1/3) CN632 (Page 31) HI AMP BOARD IC151 IC152 -PRE -VCC +VCC LO+ LORO+ ROSUB GND LI+ LIST-BY RIRI+ +PRE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 POWER AMP IC151 STK433-070 (EC78P:UK) POWER AMP IC152 STK433-090-F (EC78P:US,CND) D151 MC2838-T112-1 Q151,152 OVER LOAD DETECT R183 22k R181 1.2k R185 2.2k 0 Q151 2SA2026 R186 2.2k 0 Q152 2SA2026 0 0 R184 22k 0 0 R179 0.22 2W C175 0.1 R182 1.2k C174 0.1 R180 0.22 2W C176 0.1 C173 0.1 CN151 6P OUT-L 6 -VH 5 +VH 4 OUT-R 3 NC 2 PA-GND 1 TP151 TP152 TP153 TP154 TP155 D152 MA2J1110GLS0 C170 100 6.3V C169 100 6.3V R178 R176 220 220 R177 R175 220 220 -35.2 -36.8 36.7 0 0 0 0 35.2 0 0 2 0 0 (EC78P:UK) (EC78P:US,CND) R171 0 C155 100p C157 1 50V R161 470 R159 1k R163 47k R160 1k R196 470 C156 100p R195 470 C153 470p C160 3p R164 47k R155 47k C151 1 50V R153 22k C154 470p R156 47k C152 1 50V R154 22k R162 470 C159 3p C158 1 50V R151 ∗ C178 0.1 C161 0.01 C162 0.01 ∗ R151. 152 220 (EC78P: US, CND) 1.8k (EC78P: UK) R172 100 C166 4700p R152 ∗ R173 1k TP156 TP157 TP158 TP159 TP160 CN152 5P 1 2 3 4 5 PROTECT AMP-ON IN-L A-GND IN-R F MAIN BOARD (1/3) CN602 (Page 31) 34 34