Explanation; Detection Circuit - Pioneer VSX-817-K Service Manual

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7.3 EXPLANATION

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7.3.1 DETECTION CIRCUIT

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1. DC Derection Circuit Diagram : Example of VSX-917V/KUXJ/CA
POWER AMP
2. Overload Detection Circuit Diagram: Example of VSX-917V/KUXJ/CA FRONT Channel
TE
C
L 13942296513
POWER PACK ASSY
POWER AMP
3. Fan Stop Prottection Circuit Diagram
C
POWER PACK ASSY
XPROTECT
(refer 4)
Fan Stop
Fan -
Fan
Fan +
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R673
FL
IC602(1/2)
R628
FR
IC601(1/2)
R642
SL
IC602(2/2)
R674
SR
IC601(2/2)
R623
C
IC603(1/3)
R696
R694
SBL
IC603(3/3)
R788
SBR
IC603(2/3)
D+5V
IC602(1/2)
R665
8pin
FL
R669
R667
D651
Q665
SPEAKER Impedance
R727
Fan Stop DET.
R445
R438
Q252
+24V
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2 9
8
C
POWER PACK ASSY
D+5V
R726
Q696
Q697
Q Q
3 6 7 1 3
R725
OL DT
Normal : +5 V
OVER LOAD
Detect : 0 V
D+5V
XPROTECT
Normal : +5 V
FAN abnormal
STOP : 0 V
Q253
.
VSX-917V-K
7
9 4 2 8
A
MAIN ASSY MAIN ASSY
IC9001 IC9001
DC DT
(U-P) (U-P)
Pin72 Pin72
DC PROT DC PROT
Normal : +5 V
DC Detect : 0 V
A
MAIN ASSY
1 5 0 5 8 2 9 9 4
IC9001
(U-P)
Pin73
OL DET
A
MAIN ASSY
IC9001
(U-P)
Pin 89
XPROTECT
m
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
131
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