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5
7.1.6 PROTECTION CIRCUIT
QQ
3 7 63 1515 0
PROTECT Operation Description
AMP ASSY
C
(AWU8246)
CN3401
B5P-VH
SR+ (L+)
5
SR- (L-)
4
3
NC
SL- (R-)
2
SL+ (R+)
1
C
Q3454
2SC2412K(QR)
E
TE
L 13942296513
DC detection circuit
SP PROTECT is set to "H"
Q3453 turns on, next Q3454 turns off.
In connection with it, the power supply (+VP) to IC3302 POWER IC
is lost in RY3301 relay turning off.
Therefore, an unusual state (DC output state) is canceled.
In addition, if an unusual state is canceled, since RY3301 relay turns on,
DC detection of it will be carried out again, SP PROTECT will be set to "H",
and RY3301 will repeat ON/OFF.
Cautions: Since RY3301 relay repeats ON/OFF, a check on a feeling of hearing
Since a relay repeats ON/OFF, be careful of +VP voltage at the time of diagnosis.
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.
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SP PROTECT
Q3451
Q3452
2SA1576A
2SA1576A
(QR)
(QR)
C C
R3457
B
B
E E
10k
NP
Q3455
2SD1858X(QR)
Q3453
(QR)
C
2SC4081
B
E
B
GNDD
can be taken at the time of abnormalities.
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6
8
+B
RY3301
ASR7019
(2/2)
1
2
R3458
10k
Q Q
3
6 7
1 3
u163
.
XW-HT1
6
7
2 9
9 4
2 8
IC3302
SR+ (L+)
SR- (L-)
SL- (R-)
SL+ (R+)
VP
MUTE
+B
1 5
0 5
8
2 9
9 4
m
co
7
8
9 9
A
LA4663
B
GNDP
GNDP
C
2 8
9 9
D
E
F
59
8
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