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Amplifier
XM-1902GX
Service manual
Diagrams; Block Diagram - Sony XM-1902GX Service Manual
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:
Operating instructions
(2 pages)
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Q Q
3 7 6 3 1 5 1 5 0
4-1. BLOCK DIAGRAM
PRE AMP
IC101(1/2)
CNJ801-1
INPUT
3
1
L
2
RV101-1
OUTPUT
FILTER
(THROUGH)
XM-1902GX
CNJ803
L
HI LEVEL
INPUT
R
PRE AMP
IC201(1/2)
CNJ801-2
OUTPUT
2
(THROUGH)
1
3
R
RV101-2
FILTER
INPUT
XM-1902GX
TEST TONE
S301
GENERATOR
TEST TONE
IC301(2/2)
TEST TONE
GENERATOR
T E
IC301(1/2)
L
1 3 9 4 2 2 9 6 5 1 3
CN802
1
REM
CN801
F901
12V
2
GND
1
+14.2V
+14.2V
(B+)
(B+)
D808
D809
D810
POWER
OVER
OFFSET
THERMAL
CURRENT
Q808
w w w
.
04
SECTION 4
DIAGRAMS
PRE AMP
H.L.F
L.P.F
IC101(2/2)
IC102(2/2)
IC102(1/2)
6
7
5
7
2
5
RV801-1
FILTER
PRE AMP
H.P.F
L.P.F
IC201(2/2)
IC202(2/2)
IC202(1/2)
6
7
5
7
2
5
RV801-3
FILTER
D301
+14.2B
(B+)
D302
-14.2B
(B–)
POWER
ON/OFF
Q903
DC DET
IC901
B+
SWITCH
Q901,902
LED DRIVE
Q813
PROTECT LATCH
Q812
LED DRIVE
Q811
D811
PROTECT LATCH
D808
D807
Q810
LED DRIVE
Q809
TEMP.DET
TH801
THP802,803
x
a o
y
i
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8
S801-1
FILTER
L.P.F
LPF
IC103(2/2)
LOW BOOST
OFF
IC104(2/2)
HPF
1
6
7
RV801-2
5
7
FILTER
6
+14.2V
(B+)
LEVEL
SHIFT
RV103-1
Q101
LOW
BOOST
-14.2V
(B–)
L.P.F
IC103(1/2)
LOW BOOST
IC204(1/2)
1
2
1
5
RV801-4
7
FILTER
6
S801-2
FILTER
+14.2V
LPF
(B+)
OFF
LEVEL
HPF
SHIFT
RV103-2
Q201
LOW
BOOST
-14.2V
(B–)
Q
Q
3
7
6
3
DC-DC CONVERTER
IC901
11
12
INVERTER
10
Q904,905
REF.
REG
DRIVER
Q908
14
8
INVERTER
9
Q906,907
DRIVER
Q909
1
2
15
16
3
u 1 6 3
+20.3V
HI-CURRENT
(B+)
/HI-VOLTAGE
4
DET
-20.3V
.
IC903,Q912
(B–)
9
9
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2
4
9
9
8
LINE AMP
LINE
IC104(1/2)
SWITCH
Q102
DIFFERENTIAL
DRIVE
3
1
AMP
AMP
2
Q103
Q105
RV105
BIAS
RV104-1
BIAS
Q107
LEVEL
DIFFERENTIAL
DRIVE
AMP
AMP
Q104
Q106
LINE AMP
LINE
IC204(2/2)
SWITCH
Q202
DIFFERENTIAL
DRIVE
3
1
AMP
AMP
2
Q203
Q205
RV205
BIAS
RV104-2
BIAS
Q207
LEVEL
DIFFERENTIAL
DRIVE
AMP
AMP
Q204
Q206
LINE SWITCH
CONTROL
Q801,802
1
5
1
5
0
8
9
2
4
DC OFFSET
DET
Q803-805
DC-DC
CONVERTER
TRANSFORMER
T901
DECT
D909
D921
D919
DECT
D905
DECT
D907
DECT
D906
DECT
D908
D920
D922
DECT
D910
m
c o
• Signal path
: AUDIO
XM-1502SX/1902GX
2
9
9
CN804
POWER
1
AMP
SPEAKER
Q108,110,112
OUT
2
L
OVER CURRENT
DET
Q114-116
POWER
AMP
Q109,111,113
(Q110,111,115:XM-1902GX)
CN805
POWER
1
SPEAKER
AMP
OUT
Q208,210,212
2
R
OVER CURRENT
DET
Q214-216
POWER
AMP
Q209,211,213
(Q210,211,215:XM-1902GX)
9
8
2
9
9
+53V
(B+)
+51V
(B+)
+53V
+20.3V
(B+)
(B+)
B+
DECT
+14.2V
REG
(B+)
D911,917
Q910
B+
DECT
-14.2V
REG
D912,918
(B–)
Q911
-51V
-20.3V
(B–)
(B–)
-51V
(B–)
-53V
(B–)
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