Block Diagram - Power Amp Section - Sony STR-DE1075 Service Manual

STR-DE1075
Ver 1.1 2001.7
5-4. BLOCK DIAGRAM – POWER AMP Section –
L OUT
L
(Page 13)
C OUT
M
(Page 13)
SB OUT
N
(Page 13)
SL OUT
O
(Page 13)
POWER AMP
IC403
NF
5
+VEOUT
2
INPUT PRE BIAS
6 DRIVE
–VEOUT
DRIVE CIRCUIT
REG/PROTECTOR
3
VCC VCC VEE
1 13 14 15
B+
B–
POWER AMP
IC603
NF
9
+VEOUT
12
INPUT PRE
8
DRIVE
–VEOUT
DRIVE
11
BIAS
CIRCUIT
+VEOUT
2
INPUT PRE
6 DRIVE
–VEOUT
DRIVE
3
REG/PROTECTOR
NF
5
VCC VCC VEE
1 13 14 15
B+ B–
13 14 15
VEE NF
VCC VCC
9
+VEOUT
12
INPUT PRE BIAS
8 DRIVE
–VEOUT
DRIVE CIRCUIT
POWER AMP REG/PROTECTOR
11
IC503
1
MUTING
DRIVE
Q811, 812
EEPROM
IC1701
SDA 5
SCL 6
14
BOOSTER
Q402
AF POWER CURRENT
BIAS
LIMITER DETECT
Q440
Q406 Q404, 405
BOOSTER
Q403
OVER LOAD
SWITCH
DETECTOR
Q806
IC803,
Q801, 804
AF POWER CURRENT
B–
LIMITER DETECT
Q606 Q604, 605
BOOSTER
Q602
BIAS
Q640
BOOSTER
AF POWER CURRENT
Q603
LIMITER DETECT
Q656 Q654, 655
BOOSTER
Q652
BIAS
Q690
BOOSTER
Q653
AF POWER CURRENT
LIMITER DETECT
Q506 Q504, 505
BOOSTER
Q502
BIAS
Q540
BOOSTER BOOSTER
Q503 Q503
SYSTEM CONTROLLER
IC1703 (4/6)
PROTECTOR 118
H. P IN 1
117 AC MUTE REAR RY 5
SP A RY 2
H/P RY 3
99 EEPROM SDA
CENTER RY 6
100 EEPROM SCL
SB RY 10
14
R-CH
RY806
RELAY
DRIVE
Q823
RY802
RELAY
DRIVE
R-CH
Q808
–1
–2
RY803
RELAY
DRIVE
Q809
RY801
AF POWER
PROTECTOR
RELAY
Q802, 803,
DRIVE R-CH
Q805
Q807
• R-CH is omitted due to same as L-CH.
• SIGNAL PATH
D803
D802
J749
PHONES
TM502
+
L
– FRONT
SPEAKERS
IMPEDANCE
–
USE 4-6Ω
R
+
TM501
+
CENTER
–
–
SURROUND BACK
+
SPEAKERS
IMPEDANCE
USE 4-6Ω
+
L
–
SURROUND
–
R
+
: TUNER