Explanation; Detection Circuit - Pioneer VSX-417-K Service Manual

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7.3 EXPLANATION

7.3.1 DETECTION CIRCUIT

1. DC Derection Circuit Diagram : Example of VSX-917V/KUXJ/CA
FL
IC602(1/2)
POWER AMP
FR
IC601(1/2)
SL
IC602(2/2)
SR
IC601(2/2)
C
IC603(1/3)
SBL
IC603(3/3)
SBR
IC603(2/3)
2. Overload Detection Circuit Diagram: Example of VSX-917V/KUXJ/CA FRONT Channel
C
POWER PACK ASSY
IC602(1/2)
8pin
FL
POWER AMP
R667
3. Fan Stop Prottection Circuit Diagram
C
POWER PACK ASSY
XPROTECT
(refer 4)
Fan Stop
Fan -
Fan
Q252
Fan +
5
6
C
R673
POWER PACK ASSY
R628
R642
R674
R623
R696
R694
R788
D+5V
R725
R665
R669
D651
Q665
SPEAKER Impedance
D+5V
R727
Fan Stop DET.
Q253
R445
R438
+24V
6
7
D+5V
R726
DC DT
Q696
Q697
A
IC9001
OL DT
OL DET
Normal : +5 V
OVER LOAD
Detect : 0 V
A
IC9001
XPROTECT
XPROTECT
Normal : +5 V
FAN abnormal
STOP : 0 V
VSX-417-K
7
8
A
MAIN ASSY MAIN ASSY
IC9001 IC9001
(U-P) (U-P)
Pin72 Pin72
DC PROT DC PROT
Normal : +5 V
DC Detect : 0 V
MAIN ASSY
(U-P)
Pin73
MAIN ASSY
(U-P)
Pin 89
8
A
B
C
D
E
F
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