Block Diagram - Power Amp Section - Sony STR-DA1ES Service Manual

STR-DA1ES/DB780
5-4. BLOCK DIAGRAM – POWER AMP Section –
L OUT
G
(Page 15)
C OUT
H
(Page 15)
SL OUT
J
(Page 15)
POWER AMP
IC403
NF
5
+VEOUT
2
INPUT PRE BIAS
6 DRIVE
–VEOUT
DRIVE CIRCUIT
3
VCC VCC VEE
13 14 15
POWER AMP
IC603
NF
9
+VEOUT
12
INPUT PRE BIAS
8 DRIVE
–VEOUT
DRIVE CIRCUIT
11
VCC VCC VEE
13 14 15
POWER AMP
IC503
13 14 15
VCC VCC VEE NF
5
+VEOUT
2
INPUT PRE BIAS
6
DRIVE
–VEOUT
DRIVE CIRCUIT
3
• R-CH is omitted due to same as L-CH.
• SIGNAL PATH
: TUNER
BOOSTER
Q402
AF POWER CURRENT
BIAS
SENSOR DETECT
Q431
Q434 Q432, 433
BOOSTER
Q403
LIMITER SWITCH
B–
Q790
LIMITER SWITCH
B+
Q791.795
OVER LOAD
DETECTOR
IC803, Q804
AF POWER CURRENT
SENSOR DETECT
Q634 Q632, 633
BOOSTER
Q602
BIAS
Q631
BOOSTER
Q603
AF POWER CURRENT
SENSOR DETECT
Q534 Q532, 533
BOOSTER
Q502
BIAS
Q531
BOOSTER
Q503
SYSTEM CONTROLLER
IC1601 (3/5)
PROTECTOR 67
HP DETECT 25
REAR RELAY 70
FRONT RELAY 72
HEADPHONE RELAY 68
CENTER RELAY 71
WOOFER RELAY 69
16 16
R-CH
RY806
RELAY
DRIVE
Q823
RY448
RELAY
DRIVE
R-CH
Q808
RY803
RELAY
DRIVE
Q809
RY801
AF POWER
PROTECTOR
RELAY
Q802, 803,
DRIVE
R-CH
Q805
Q807
D803
J849
PHONES
TM449
+
L
FRONT
–
SPEAKERS
IMPEDANCE
–
USE 4-16Ω
R
+
TM501
+
CENTER
–
SPEAKERS
IMPEDANCE
USE 4-16Ω
+
L
–
SURROUND
–
R
+
PRE RY
K
(Page 15)