Pioneer VSX-816-S Service Manual - Page 128
XPROTECT Detection Circuit Diagram, POWER PACK ASSY, MAIN ASSY
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1 2 3 4 4. XPROTECT Detection Circuit Diagram A When below 6 kind of voltage supply become to be short circuit to GND, XPROTECT circuit work and U-P input port voltage change from +5 V to 0 V. The U-P detect this condition as ERROR. • Voltage supply to POWER AMP IC (V neck+) • Voltage supply to POWER AMP IC (V neck-) • Voltage supply to POWER AMP IC (VH+) • Voltage supply to POWER AMP IC (VH-) • Voltage supply to +12 V REGULATOR IC • Voltage supply to -12 V REGULATOR IC B MAIN ASSY IC9001 (U-P) 89 XPROTECT C D Voltage supply to POWER AMP IC (V neck+) Q701 2SC5511(E) D713 R713 1SS133 1k D+5V Q698 R697 10k R698 33k Voltage supply to POWER AMP IC (V neck-) Voltage supply to POWER AMP IC (VH+) D+5V POWER PACK ASSY Q702 2SA2005(E) D+5V Q705(1/2) R727 10k R714 1k Q705(2/2) C709 1/50 D703 R715 10k R716 10k Q707(1/2) Q707(2/2) C703 3300 /42 C704 3300 /42 D702 D5SBA20(B) Voltage supply to POWER AMP IC (VH-) Voltage supply to +12 V REGULATOR IC D+5.6V Q807(2/2) Q808(2/2) R808 1k C806 1/50 Voltage supply to -12 V REGULATOR IC D807 R807 10k R806 10k Q807(1/2) Q808(1/2) C801 2200 /25 D806 MTZJ6.2B C802 2200 /25 D801 S1WB(A)60SD E F 128 VSX-816-K 1 2 3 4