Read Sony XM-ZR1252 Service Manual online
XM-ZR1252
XM-ZR1252
11
11
SECTION 3
DIAGRAMS
3-1. BLOCK DIAGRAM
2
3
3
PRE AMP
IC301 (1/2)
DIFFERENTIAL
AMP
Q151
PROTECTOR
Q153
POWER
AMP
Q161,164
OVERLOAD
DET
Q163,166
DRIVE
AMP
Q155
DRIVE
AMP
Q159
DIFFERENTIAL
AMP
Q152
POWER
AMP
Q162,165
DRIVE
AMP
Q156
DRIVE
AMP
Q160
BIAS
Q257,
258
MUTE
Q103
MUTE
Q203
CN902 (1/2)
CN902 (2/2)
D301
INPUT
L
(BTL)
SPEAKER OUT
L
R
SWITCH
Q102
REM
+12V
GND
9
DIFFERENTIAL
AMP
Q251
POWER
AMP
Q261,264
OVERLOAD
DET
Q263,266
DRIVE
AMP
Q255
DRIVE
AMP
Q259
DIFFERENTIAL
AMP
Q252
POWER
ON/OFF
ON/OFF
Q913
POWER
AMP
Q262,265
DRIVE
AMP
Q256
DRIVE
AMP
Q260
CN901
L
HIGH LEVEL
INPUT/
SENSING POWER ON
R
L
OUTPUT
(THROUGH)
R
SWITCH
Q202
ZERO LEVEL
PROTECT
Q506,507
15
1
2
2
14
12
B+
SWITCH
Q912
OVER VOLTAGE
DETECT
Q914
REF.
REG
REG
CN903 (2/2)
F901
16
+38V
–41V
+41V
SWITCHING
DRIVER
Q905,906
SWITCHING
DRIVER
Q903,904
DRIVER
Q901
14V REG.
Q504
–14V REG.
Q505
PROTECTOR
DETECT
Q908,909
DRIVER
Q902
8
10
11
LED901
POWER/
PROTECTOR
DC-DC
CONVERTER
TRANSFORMER
T901
D503
D504
RECT
D507,508
D506
D505
DC-DC CONVERTER
IC901
• Signal path
: AUDIO
: AUDIO
CN903 (1/2)
BTL
INHIBIT
SWITCH
Q906
R
(PROTECTOR)
LED902
(ILLUMINATION)
G
(POWER)
R
1
25A
F902
25A
GAIN CONTROL/
LOW BOOST AMP
IC302 (1/2)
PRE AMP
IC301 (2/2)
2
3
3
THERMAL DET
IC501 (1/2)
LOW BOOST
(40Hz)
VR302
RV301-1
RV301-2
RV302-1
RV302-2
RV302-2
LEVEL
RV301
-2
-1
1
7
TEMP.DET
TH502,503
TH502,503
TEMP.DET
TH501
DC OFF DET
Q501,502
HPF
Q201
PROTECT
SWITCH
Q503
1
3
THERMAL DET
IC501 (2/2)
5
7
–38V
BIAS
Q157,
158
3
D901
+41V
PROTECTOR
Q154
–41V
PROTECTOR
Q253
+41V
PROTECTOR
Q254
–41V
6
5
5
LPF
Q301
HPF
Q101
B+
SWITCH
Q911
GAIN CONTROL/
LOW BOOST AMP
IC302 (2/2)
7
5
EQ
EQ
+14V
–14V
–
+
–
+
–
+
–
+
FILTER
(80Hz)
SW301
HP
LP
OFF
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