Explanation; Detection Circuit - Pioneer SX-316-S 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-816/KUXJ/CA
POWER AMP
2. Overload Detection Circuit Diagram: Example of VSX-816/KUXJ/CA FRONT Channel
TE
L 13942296513
POWER PACK ASSY
POWER AMP
3. Fan Stop Prottection Circuit Diagram
POWER PACK ASSY
DC DET
(refer 1)
Fan Stop
Fan
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R673
FL
IC602(1/2)
R626
FR
IC601(1/2)
R642
SL
IC602(2/2)
R674
SR
IC601(2/2)
R623
C
IC603(1/3)
R696
R694
SBL
IC603(2/3)
R788
SBR
IC603(2/3)
IC802(1/2)
R665
8pin
FL
R669
R667
D651
Q665
SPEAKER Impedance
R726
Fan Stop DET.
R445
Fan - R446
Fan +
-12V +12V
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POWER PACK ASSY
D+5V
R726
Q696
Q697
Q Q
3 6 7 1 3
OL DT
Normal : +5 V
OVER LOAD
Detect : 0 V
D+5V
OL DT
Normal : +5 V
FAN abnormal
STOP : 0 V
Q253
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SX-316-S
6
7
2 9 9 4 2 8
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
MAIN ASSY
1 5 0 5 8 2 9 9 4
IC9001
(U-P)
Pin73
OL DET
MAIN ASSY
IC9001
(U-P)
Pin72
DC PROT
m
co
7
8
9 9
A
B
C
2 8 9 9
D
E
F
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