Detection Circuit - Pioneer VSX-418-K Service Manual

5

5.2 DETECTION CIRCUIT

1. DC Derection Circuit Diagram : Example of VSX-918V/KUXJ/CA
FL
IC603(2/3)
POWER AMP
FR
IC601(1/2)
SL
IC603(3/3)
SR
IC601(2/2)
C
IC603(1/3)
2. Overload Detection Circuit Diagram: Example of VSX-918V/KUXJ/CA FRONT Channel
C
POWER PACK ASSY
IC603(2/3)
7pin
FL
POWER AMP
R785
3. Fan Stop Protection Circuit Diagram
C
POWER PACK ASSY
XPROTECT
(refer 4)
Fan Stop
Fan -
Fan
Q252
Fan +
5
6
R788 C
POWER PACK ASSY
R628
R694
R674
R623
R696
D+5V
R725
D778
R784
R786
D777
Q505
SPEAKER Impedance
D+5V
R727
Fan Stop DET.
Q253
R445
R438
+24V
6
7
D+5V
R726
DC DT
Q696
Q697
OL DT
Normal : +5 V
OVER LOAD
Detect : 0 V
XPROTECT
XPROTECT
Normal : +5 V
FAN abnormal
STOP : 0 V
VSX-418-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
A
MAIN ASSY
IC9001
(U-P)
Pin73
OL DET
A
MAIN ASSY
IC9001
(U-P)
Pin 89
8
A
B
C
D
E
F
23