Read Sony STR-DG300 Service Manual online
STR-DG300
14
14
STR-DG300
4-4. BLOCK DIAGRAM — POWER SECTION —
8
12
11
DRIVE
POWER AMP
Q701-704
CURRENT
DETECT
Q705,706
RY791
RY600
RY701
PRE DRIVER
IC701
IN 2
+VOUT2
-VOUT2
SPEAKERS
IMPEDANCE
USE 8-16Ω
R
FRONT B
L
R-CH
R-CH
L-CH
R-CH
R-CH
TUNER/
AUDIO
SECTION
D
RY901
RY801
F2
+3.3V
(STBY)
+2.6V
+5V-1
-7V
+7V
TU+10V
-20V
RECT
D910-913
T902
POWER
TRANSFORMER
D914
AC IN
DETECT
Q921
D915
AC IN
~
61
-20V REG
Q801
RELAY
DRIVER
Q901
RELAY
DRIVER
Q790
69
66
62
PROTECTOR
D721,722,732
Q722,723,725,793,795
55
58
48
68
F1
-B
+3.3V/+2.6V
REG
4
5
+3.3V
2
IC1901
+5V-2
+5V
REG
1
3
IC1001
TU+3.3V
+3.3V
REG
1
3
IC1071
+3.3V
REG
1
3
IC1904
+9V
REG
1
3
IC1902
-15V
+15V
+7V
REG
3
1
IC801
-7V
REG
1
3
IC802
+5V
REG
1
3
IC1031
+B
R-CH
R-CH
RECT
D802
D802
RECT
D920-923
RECT
D805-808
T901
POWER
TRANSFORMER
TM600
R
FRONT A
L
R-CH
TM601
J791
PHONES
HP-RY
SB-RY
FRONT RY
HP DETECT
HP-RY
HP DETECT
SB-RY
FRONT-RY
HP_RY
FRONT RY
REAR_RY
PROTECTOR
HP DETECT
P0WER RY
67
SP_B_RY
72
BRIDGEABLE RY
STOP
C/SB RY
SYSTEM
CONTROL
IC1101 (4/4)
PRE
DRIVE
D1110
D1108
D1107
D1111
RELAY
DRIVER
Q710
RELAY
DRIVER
Q809
R810
R811
F902
F901
J911
AC OUTLET
R910
RELAY
SWITCH
RELAY
DRIVER
Q800
• Signal path
: TUNER (FM/AM)
• R-ch is omitted due to
same as L-ch.
same as L-ch.
(Page 11)
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