Detection Circuit - Pioneer VSX-518-K Service Manual

5

5.2 DETECTION CIRCUIT

QQ
3 7 63 1515 0
1. DC Derection Circuit Diagram : Example of VSX-918V/KUXJ/CA
POWER AMP
2. Overload Detection Circuit Diagram: Example of VSX-918V/KUXJ/CA FRONT Channel
C
POWER PACK ASSY
TE
L 13942296513
POWER AMP
3. Fan Stop Protection Circuit Diagram
C
POWER PACK ASSY
XPROTECT
(refer 4)
Fan Stop
Fan -
Fan
Fan +
www
.
5
http://www.xiaoyu163.com
6
R788
FL
IC603(2/3)
R628
FR
IC601(1/2)
R694
SL
IC603(3/3)
R674
SR
IC601(2/2)
R623
C
IC603(1/3)
R696
D+5V
D778
IC603(2/3)
R784
7pin
FL
R786
R785
D777
Q505
SPEAKER Impedance
R727
Fan Stop DET.
R445
R438
Q252
+24V
x ao u163
y
i
6
http://www.xiaoyu163.com
2 9
8
C
POWER PACK ASSY
D+5V
R726
Q696
Q697
Q Q
3 6 7 1 3 1 5
R725
OL DT
Normal : +5 V
OVER LOAD
Detect : 0 V
D+5V
XPROTECT
Normal : +5 V
FAN abnormal
STOP : 0 V
Q253
co
.
VSX-518-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
0 5 8 2 9 9 4
IC9001
(U-P)
Pin73
OL DET
A
MAIN ASSY
IC9001
(U-P)
Pin 89
XPROTECT
m
7
8
9 9
A
B
C
2 8 9 9
D
E
F
23
8