Block Diagram - Power Section - Sony STR-DG720 Service Manual

Q Q
3 7 6 3 1 5 1 5 0
5-7. BLOCK DIAGRAM – POWER Section –
PRE DRIVER
IN 1 PRE
FL–CH 6
DRIVE
FR–CH
R–CH
PRE DRIVER
IN 1 PRE
6
SL–CH
DRIVE
TUNER/
AUDIO E
SR–CH R–CH
SECTION
PRE DRIVER
(Page 17)
IN 2 PRE
C–CH
8
DRIVE
IN 1 PRE
SBL–CH 6
DRIVE
SBR–CH R–CH
(IC500)
T E
L 1 3 9 4 2 2 9 6 5 1 3
SW–CH
PROTECTOR 68
D1108
D1109
SBR RY 20
FRONT A RY 17
D1107
14
C/CUR/SB
D1111
SW_RY 16
SYSTEM
D1112
CONTROL
IC1010 (6/6)
HP_RY 13
HP DETECT 12
FRONT B/ST SW RY 15
FUSE_DETECT 25
POWER_RY 9
SUB T 97
w w w
STOP 83
STR-DG720
IC700
+VOUT1
2
DRIVE –VOUT1
POWER AMP
3
Q701–704
–55V +B
IC800
R–CH
+VOUT1
2
DRIVE –VOUT1
POWER AMP
3
Q801–804
–55V +B
IC600
R–CH
+VOUT2
12
DRIVE –VOUT2
POWER AMP
11
Q651–654
+VOUT1
2
DRIVE –VOUT1
POWER AMP
3
Q601–604
–55V +B
R–CH
DIGITAL
I
PROTECTOR
SECTION
(Page 18)
PROTECTOR
D320,325–327
Q320,321,323–325
+B
–B
B–SWITCH –20V
–55V
SBR RY
Q500,501
TU+9V
FRONT A RY
IC565
OVERLOAD
2 7
DETECT AMP
+7V
C/SUR/SBL RY
SW_PREOUT_RY
–7V
+A5V
D1110
+5V
HP RY
HP DETECT
+3.3V
FRONT B RY
+1.2V
+3.3V
(STBY)
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RELAY
DRIVER
Q375
RELAY
CURRENT OVERLOAD
DRIVER
DETECT DETECT
Q350
Q711,712 D720,Q720
R–CH R–CH
RELAY
DRIVER
Q365
CURRENT OVERLOAD
DETECT DETECT
RELAY
Q811,812 D820,Q820
DRIVER
Q355
R–CH R–CH
CURRENT OVERLOAD
DETECT DETECT
Q661,662 D670,Q670
RELAY
DRIVER
Q360
CURRENT OVERLOAD
DETECT DETECT Q Q
3 7 6
Q611,612 D620,Q620
R–CH R–CH
RELAY
DRIVER
Q301
RECT
D921
–20V REG
Q930
IC1902
+9V
3 1
REG
IC350 +15V
+7V
3 1
REG
IC352
–7V
3 2
REG
IC1001
–15V
+5V
3 1 IC1031
REG
+5V
+6.3V
3 1
REG
IC1013
+3.3V
4 2 +4.1V
REG
IC1002
+1.2V
1 3
REG
D1001
SUB TRANSFORMER
DRIVE
IC1904
Q951,955
D955
+3.3V
3 1
REG
u 1 6 3
.
23 23
2 4
8 9 9
J790
R–CH
PHONES
RY375
TB601
L
RY350
FRONT A
R–CH
R
TB602 (1/2)
L
RY365
FRONT B
R–CH
R
SPEAKERS
TB606 (1/2)
IMPEDANCE
USE 8–16Ω
L
SURROUND
RY355
R–CH
R
TB602 (2/2)
• Signal path
CENTER
• R-ch is omitted due to
TB606 (2/2)
same as L-ch.
RY360
L
SURROUND
BACK
R–CH
R
RY370
RELAY
3 1 5 1 5 0 8 9 2
DRIVER
J405
Q370
AUDIO SUB
OUT WOOFER
RY301
T901
POWER
TRANSFORMER
(MAIN)
TUNER/
R2 AC
AUDIO F
R2 AC
SECTION
R910
(Page 17)
RECT
D910–913
R911
F901
R940
RECT
D940–943
F1
F2
-20V
D930
RY901
T904
RELAY
DRIVER POWER
Q901 TRANSFORMER
(SUB)
m
RECT
D950–953
c o
AC IN D991 D990
DETECT
Q990
STR-DG720
2
8 9 9
: TUNER (FM/AM)
4 9 8 2 9 9
~
AC IN