Read Sony STR-DB725 / STR-DB825 Service Manual online
– 9 –
– 10 –
STR-DB725/DB825
– POWER SECTION –
RELAY
DRIVE
Q601
LIMITER
Q504
14
5
15
6
1
2
3
VEE
VCC
IN
MUT
+VE
NF
–VE
13 VCC
POWER AMP(L)
IC601
L
+B
–B
LIMITER
Q505
BOOSTER
Q506
BOOSTER
Q507
CUR DET
Q508
PROTECTOR
Q509,510
Q511
LIMITER
Q604
9
15
12
11
VEE
IN
+VE
NF
–VE
13 VCC
POWER AMP(C/W)
IC001
C
+B
–B
LIMITER
Q605
BOOSTER
Q606
BOOSTER
Q607
CUR DET
Q608
PROTECTOR
Q609,610
Q611
LIMITER
Q704
MUTE
Q691,692
14
5
15
6
1
2
3
VEE
VCC
IN
MUT
+VE
NF
–VE
13 VCC
POWER AMP(SL)
IC701
SL
+B
–B
LIMITER
Q705
BOOSTER
Q706
BOOSTER
Q707
CUR DET
Q708
8
RY602
RELAY
DRIVE
Q546
RY501
RELAY
DRIVE
Q596
RY502
B
A
A+B
OFF
S155
SPEAKERS
RELAY
DRIVE
Q645
RY601
RELAY
DRIVE
Q745
RY701
RELAY
OVER LOAD SW
Q609, 610, 709, 710
DRIVE
Q544
Q611
RY503
RELAY
DRIVE
Q901
RY901
J501
C
S(L)
S(R)
R CH
R CH
WIRELESS
REAR
SPEAKER
CNJ701
CENTER
WOOFER
J701
PHONES
TM701
FRONT
SPEAKER
TM501
R CH
R CH
POWER
CONT
IC901
5
8
3
6
DELAY
+B SW
Q902
SWITCH
Q747,748
D801
SWITCH
Q613,616
PROTECTOR
Q547-549
D806
F2
F1
+5.6V
F801
F802
D802-805
+B
-B
IMPEDANCE
SELECTOR
8
4
S501
F901
F903
D901-904
DB825
CNJ909
CNP901
AC IN
L
R
:FM
:CD
B
MAIN
SECTION
• Signal Path
• RCH is omitted
IN
W
6
14 VCC
2
+VE
3
–VE
1
+18V
REG
IC702
3
T901
F803
F804
1
-15V
REG
REG
3
3
+5V
REG
1
REG
Q801
IC809
+24V
-24V
-30V
3
+15V
REG
1
IC809
IC801
3
+12V
REG
1
IC451
3
+5V
REG
1
IC450
+15V
+12V
+5V
IC803
-15V
T902
SYSTEM CONTROL/
MODE CONTROL
IC103(2/2)
P RY
A
MAIN
SECTION
8
A
C
MUTE
44
FR
ONT R
Y
47
PR
O
TECT
OR
50
SP OFF
43
CENTER R
Y
45
MIX SUB R
Y
42
SUR R
Y
48
POWER RY
REMOTO
CONTROL
RECEIVER
IC101
26
SIRCS
Q105
RESET
Q101
10
RESET
Q102
X1
12
X2
11
X101
4.19MHz
KEY1
33
FUNCTION
KEY
S102-S111
KEY2
32
FUNCTION
KEY
S115-122
KEY3
31
FUNCTION
KEY
S114, S125-130
MUTING LED
59
MUTING
D116
FUNCTION
RV101
POWER
S151
PO
WER
56
LED DRIVE
Q103,104
T
ONE
60
SURR
61
INDEX
62
DIRECT P
ASS
58
5.1 INPUT
57
Q103,104
D111,135
D115-113
TUNER
64
VIDEO1
70
MD/T
APE
66
PHONO
63
TV/DBS
67
131
D124
CD
65
71 78 . 80 88
100 89
FL101
FL TIBU
F2
F1
P1 17
G1 12
09
39
STOP
I/R
CONT
IC102
I/O
BUFFER
Q106
RESET
Q107
11
14
12
5
33
2
CTRL A1 LA
T
28
15
16
X102
7.28MHz
I/R
DET
IC107
LED
DRIVE
Q129,130
D101-103
VIDEO 3
68
VIDEO 2
69
CTRL A1
REAR
SPEAKER
RE B
54
RE A
53
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