Read Sony STR-DB1070 / STR-DB870 Service Manual online
18
18
Ver 1.1
STR-DB870/DB1070
6-4.
BLOCK DIAGRAM – POWER AMP Section –
+
+
–
–
TM501
PRE
DRIVE
DRIVE
BIAS
CIRCUIT
REG/PROTECTOR
BIAS
Q440
BOOSTER
Q402
BOOSTER
Q403
L
6
1
13 14
15
3
2
5
B+
B–
B–
POWER AMP
IC403
POWER AMP
IC603
(Page 17)
L OUT
INPUT
–VEOUT
+VEOUT
NF
PRE
DRIVE
DRIVE
BIAS
Q640
BOOSTER
Q602
BOOSTER
Q603
M
8
11
12
9
(Page 17)
C OUT
INPUT
–VEOUT
+VEOUT
PRE
DRIVE
DRIVE
BIAS
Q690
BOOSTER
Q652
BOOSTER
Q653
N
6
3
2
(Page 17)
SB OUT
INPUT
–VEOUT
+VEOUT
NF
NF
VCC VCC
VEE
PRE
DRIVE
DRIVE
BIAS
CIRCUIT
REG/PROTECTOR
BIAS
Q540
BOOSTER
Q502
BOOSTER
Q503
O
8
1
13 14
11
12
9
B+
B–
POWER AMP
IC503
EEPROM
IC1701
SYSTEM CONTROLLER
IC1703 (5/7)
(Page 17)
SL OUT
INPUT
–VEOUT
+VEOUT
NF
VCC VCC
VCC VCC
VEE
VEE
13 14
15
15
1
5
BIAS
CIRCUIT
REG/PROTECTOR
OVER LOAD
DETECTOR
IC803,
Q801, 804
AF POWER
SENSOR
Q406
CURRENT
DETECT
Q404, 405
AF POWER
SENSOR
Q606
CURRENT
DETECT
Q604, 605
AF POWER
SENSOR
Q656
CURRENT
DETECT
Q654, 655
AF POWER
SENSOR
Q506
CURRENT
DETECT
Q504, 505
MUTING
DRIVE
Q811, 812
5
99
6
100
117
5
1
118
2
3
6
10
SDA
SCL
EEPROM SDA
EEPROM SCL
AC MUTE
REAR RY
H. P IN
PROTECTOR
SP A RY
H/P RY
CENTER RY
SB RY
RELAY
DRIVE
Q823
RY806
R-CH
RELAY
DRIVE
Q808
RY802
RELAY
DRIVE
Q809
RY803
RELAY
DRIVE
Q807
RY801
D803
D802
PHONES
CENTER
SURROUND BACK
L
R
J749
+
+
–
–
TM502
–
–
+
+
R-CH
R-CH
SURROUND
L
R
(DB1070)
(DB1070)
LIMITER SWITCH
Q806
AF POWER
PROTECTOR
Q802, 803,
Q805
FRONT
SPEAKERS
IMPEDANCE
USE 4-6
Ω
(DB1070)
–1
• R-CH is omitted due to same as L-CH.
• SIGNAL PATH
: TUNER
SPEAKERS
IMPEDANCE
USE 4-6
Ω
–2
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