Diagrams; Block Diagram - Sony XM-552ZR Service Manual

Q Q
3 7 6 3 1 5 1 5 0

3-1. BLOCK DIAGRAM

CN902
L -1
(BTL)
INPUT
R
-2
D906
CN901
L
HIGH LEVEL
INPUT/SENSING
POWER ON
R
T E
L 1 3 9 4 2 2 9 6 5 1 3
CN903
REM
OVER VOLTAGE
DETECT
Q901
+12V
F901
30A
GND
w w w
XM-552ZR
SECTION 3

DIAGRAMS

PRE AMP
IC301 (1/2)
2
CR
1
FILTER
3
SW301-1
SW301
LPF(80Hz)
ON
PRE AMP
IC301 (2/2)
OFF
5
CR
7
FILTER
6
SW301-2
POWER
ON/OFF
Q903
DC DET
IC902
B+
SWITCH
Q902
PROTECTOR
DETECT
THERMAL DET
Q905,906
Q912,913
D903 D902
TEMP. DET BUFFER
TH901-903 Q904
x a o
y
. i
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L.P.F GAIN CONTROL AMP
IC302 (1/2) IC303 (1/2)
2
1
2 1
3
VR301-1
VR301
LEVEL
GAIN CONTROL AMP
L.P.F
IC303 (2/2)
IC302 (2/2)
6
7 6 7
5
VR301-2
Q Q
3 7 6
DC-DC CONVERTER
IC901
8
SWITCHING
9 DRIVER
12
DRIVER
Q908
REF.
REG
DRIVER
Q909
14
11
SWITCHING
10 DRIVER
1
2
LED DRIVER
3
Q907
LED901
15
POWER/
16
PROTECTOR
R
(PROTECTOR) (POWER)
u 1 6 3
.
9 9
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2 4
8 9 9
MUTE
SWITCH
Q102
DIFFERENTIAL DRIVE DRIVE POWER
AMP AMP AMP AMP
Q110
Q103 Q104 Q108
BIAS OVERLOAD
Q106, DET
107
Q112
DIFFERENTIAL DRIVE DRIVE POWER
AMP AMP AMP AMP
Q102 Q105 Q109 Q111
MUTE
SWITCH
Q201
DIFFERENTIAL DRIVE DRIVE POWER
AMP AMP AMP AMP
Q203 Q204 Q208 Q210
BIAS OVERLOAD
DET
Q206,
Q212
207
DIFFERENTIAL DRIVE DRIVE POWER
AMP AMP AMP AMP
Q202 Q205 Q209 Q211
MUTE
CONTROL
Q301,302,311
OVERLOAD
3 1 5 1 5 0 8 9 2
PROTECT
Q307,308
DC-DC
CONVERTER
TRANSFORMER
T901
RECT
Q910
D303
RECT
D304
Q911
• Signal path
: AUDIO
G
m
c o
XM-552ZR
2
8 9 9
CN904
L
BTL
SPEAKER OUT
R
4 9 8 2 9 9
+30V
+15V REG
+15V
Q303,304,309
–30V
–15V REG
–15V
Q305,306,310