Detection Circuit - Pioneer VSX-D912-S Service Manual

1

7.3.3 DETECTION CIRCUIT

1.DC Detection Circuit Diagram:
A
B
2. Overload Detection Circuit Diagram:
C
3. Fan Stop Prottection Circuit Diagram:
D
4. PCB Board Protection Circuit Diagram
E
A
F
86
1
2
AMP
IC601, IC602
DC DET.
Q605, Q606,
Q633, Q683
Q655, Q656
O.L. DET
IC601, IC602
AMP
+5V
DC DET.
Fan Stop DET.
Fan Stop
R265
Fan -
Fan
Fan +
-12V +12V
Main Assy
+5V G
Amp Input Assy
u-con
IC9001
Pin 24
2
3
+5V
u-con
IC9001
DC PROT
Pin 23
L : ON
Q696 H : OFF
Q697
+5V
u-con
IC9001
OL DET
Pin 73
L : ON
H : OFF
u-con
IC9001
DC PROT
Pin 23
L : ON
H : OFF
Q253
Amp &
C
Primary
Assy
Speaker
Amp
VSX-D912-S
3
4
4