Pioneer XW-HTD630 Manual page 62
Digital wireless rear speaker system
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Also See for XW-HTD630:
- Operating instruction (96 pages) ,
- Operating instructions manual (104 pages)
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1
DC Detection Circuit for SP Terminal
A
B
This circuit is to protect the speaker from overheating if the Amplifier Power IC(IC3301) malfunctions.
[ When L+ position becomes 0V ]
As the Amplifier Power IC is single power supply, the bias voltage for SP terminal is always about 8V. Therefore the voltage of point A
is 5.1V, point B is 6.9V, and then Q3451 becomes ON. Then the voltage of DC PROTECT becomes 7V.
Operation of the Protection Circuit
C
AMP PROTECT
Abnormal "L"
DC DETECT
Abnormal "H"
SP PROTECT
Abnormal "H"
When the base of Q3453 becomes "H", Q3453, Q3463 and Q3461 becomes ON, and 12V falls on the S1 solenoid.
D
Therefore the Power Switch S1 will turn OFF.
E
F
62
1
2
B
MAIN ASSY
R3411
B
4.7k
L+
R3454
R–
4.7k
R3455
4.7k
C3451
R3453
L–
4.7k
R+
R3452
4.7k
B
MAIN ASSY
+B
V+5
Q3462
DTA124EUA
Q3463
DTA124EUA
R3458
15k
C3462
100/6.3
2
3
Q3452
2SA1576
Q3451
2SA1576
R3457
R3456
10k
10k
100/10
A
Q3461
2SD2012
R3462
R3461
1
Q3453
820
2SC4081
D3461
MTZJ13B
C3461
10/50
XW-HTD630
3
4
DC PROTECT
F
PRI ASSY
S1
Solenoid
4
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