Pioneer VSX-816-S Service Manual - Page 127
Explanation, 7.3.1 Detection Circuit
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5 6 7 8 7.3 EXPLANATION 7.3.1 DETECTION CIRCUIT 1. DC Derection Circuit Diagram : Example of VSX-816/KUXJ/CA A R673 FL POWER PACK ASSY POWER AMP IC602(1/2) R626 FR IC601(1/2) D+5V MAIN ASSY R642 SL IC602(2/2) R674 SR IC601(2/2) R623 C R726 DC DT IC9001 (U-P) Pin72 Q696 Normal : +5 V DC Detect : 0 V DC PROT B Q697 C696 C697 IC603(1/3) R694 SBL R696 IC603(2/3) SBR R788 IC603(2/3) C 2. Overload Detection Circuit Diagram: Example of VSX-816/KUXJ/CA FRONT Channel MAIN ASSY POWER PACK ASSY POWER AMP IC802(1/2) 8pin FL R665 R669 OL DT Normal : +5 V OVER LOAD Detect : 0 V IC9001 (U-P) Pin73 OL DET R667 Q665 D651 D SPEAKER Impedance 3. Fan Stop Prottection Circuit Diagram POWER PACK ASSY DC DET (refer 1) Fan Stop Fan Fan Fan + Fan Stop DET. R445 R446 -12V +12V C255 D+5V R726 Q253 MAIN ASSY OL DT Normal : +5 V FAN abnormal STOP : 0 V IC9001 (U-P) Pin72 DC PROT VSX-816-K 5 6 7 E F 127 8
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