23
VSX-518-K
5
6
7
8
5
6
7
8
A
B
C
D
E
F
5.2 DETECTION CIRCUIT
MAI
N
ASSY
IC9001
(U-P)
Pin72
DC PROT
N
ormal : +5
V
DC Detect : 0
V
FL
PO
W
ER AMP
PO
W
ER AMP
XPROTECT
(refer 4)
1. DC Derection Circuit Diagram : Example of
V
SX-91
8V
/KUXJ/CA
2. Overload Detection Circuit Diagram: Example of
V
SX-91
8V
/KUXJ/CA FRO
N
T Channel
3. Fan Stop Protection Circuit Diagram
PO
W
ER PACK ASSY
PO
W
ER PACK ASSY
MAI
N
ASSY
IC603(2/3)
R7
88
R696
C696
C697
R726
D+5
V
IC9001
(U-P)
Pin72
DC PROT
DC DT
OL DT
Q696
Q697
IC601(1/2)
R62
8
IC603(3/3)
R694
IC601(2/2)
R674
IC603(1/3)
R623
IC603(2/3)
7pin
FR
SL
SR
C
R7
8
5
R7
8
6
D777
R7
8
4
R445
Fan Stop DET.
D+5
V
+24
V
R727
R43
8
FL
Q505
D77
8
MAI
N
ASSY
IC9001
(U-P)
Pin73
OL DET
N
ormal : +5
V
O
V
ER LOAD
Detect : 0
V
PO
W
ER PACK ASSY
XPROTECT
MAI
N
ASSY
IC9001
(U-P)
Pin
8
9
XPROTECT
N
ormal : +5
V
FA
N
abnormal
STOP : 0
V
SPEAKER Impedance
Fan Stop
Fan
Fan -
Fan +
Q253
Q252
D+5
V
R725
C
C
C
A
A
A