Power Section - Sony STR-DB725 Service Manual

STR-DB725/DB825
– POWER SECTION –
+B
–B
L
+B
–B
C
W
A
MAIN
SECTION
+B
–B
SL
MUTE
Q691,692
P RY
B
MAIN
SECTION
CTRL A1
8
12
X1
X101
4.19MHz
11
X2
09
33 32 31
FUNCTION FUNCTION FUNCTION
KEY KEY KEY
S102-S111 S115-122 S114, S125-130
POWER AMP(L)
IC601
13 VCC
BOOSTER
14 VCC +VE 2
Q506
15 VEE
LIMITER
Q504
6 IN NF 5
LIMITER
Q505
PROTECTOR
1 MUT
Q509,510
BOOSTER CUR DET
–VE 3
Q507 Q508
POWER AMP(C/W)
IC001
13 VCC
BOOSTER
14 VCC +VE 12
Q606
15 VEE
LIMITER
Q604
8 IN
NF 9
6 IN
LIMITER
Q605
PROTECTOR
Q609,610
BOOSTER CUR DET
–VE 11
Q607 Q608
+VE 2
–VE 3
POWER AMP(SL)
IC701
13 VCC
BOOSTER
14 VCC +VE 2
Q706
15 VEE
LIMITER
Q704
6 IN NF 5
LIMITER
Q705
1 MUT
BOOSTER CUR DET
–VE 3
Q707 Q708
PROTECTOR
Q547-549
47
SYSTEM CONTROL/
MODE CONTROL
IC103(2/2)
59 53 54 56 61 60 62 58 57
LED DRIVE
Q103,104 Q103,104
FUNCTION
RV101
D116 S151
MUTING
POWER
D115-113 D111,135
– 9 –
RY602
RELAY
DRIVE
Q601
S155
Q511 SPEAKERS
A+B
RY501
OFF
RELAY
DRIVE
A
Q546
B
RY502
RELAY
DRIVE
Q596
RY601
Q611
RELAY
DRIVE
Q645
RY503
RELAY
DRIVE
Q544
OVER LOAD SW
Q609, 610, 709, 710
Q611
RY701
RELAY
DRIVE
Q745
+B
-B
S501
8
IMPEDANCE
SELECTOR 4
44 50 43 45 42
POWER RY 48
SIRCS 26
RESET 10
STOP
39
P1 17 G1 12
71 78 . 80 88 100 89
64 70 63 66 67 69 65 68 28
FL101
FL TIBU
F2 F1
D124 131
DB825
J701
R CH
PHONES
L
TM501
FRONT
SPEAKER
R
R CH
C
S(L)
CENTER
TM701
S(R) SPEAKER
R CH
REAR
J501
WOOFER
CNJ701
R CH
WIRELESS
REAR
SPEAKER
IC702
+18V SWITCH
3 1
REG Q747,748
SWITCH
Q613,616
+24V
IC809 IC809
+5V
1 3
REG
+15V -24V
+12V
IC450 IC451 IC801
REG
Q801
+5V +12V +15V
+5V 1 3 1 3 1 3
REG REG REG
-30V
IC803
-15V
-15V 3 1
REG
IC101
Q105
REMOTO
CONTROL
RECEIVER
DELAY
Q102
+5.6V +B SW
RESET
Q902
Q101
D901-904
3
POWER
8 CONT 5
IC901
6
Q106
I/O RESET
11 14
BUFFER I/R Q107
CONT
IC102
12 IC107 Q129,130 D101-103
33 I/R LED
DET DRIVE
5 2
15 16
X102
7.28MHz
– 10 –
• RCH is omitted
• Signal Path
:FM
:CD
F801
D801 T901
F802
F803
D802-805
F804
D806 F2
F1
RY901 F901
RELAY
DRIVE
CNJ909
Q901
F903
T902
CNP901
AC IN