Block Diagrams; Main Section - Sony STR-DB725 Service Manual

3-2. BLOCK DIAGRAMS

– MAIN SECTION –
TUNER UNIT IS SUPPLIED AS THE ASSEMBLED BLOCK
TUNER UNIT
FM
FM L OUT
75Ω
AM R OUT R CH R CH
AM
RDS
AUDIO OUT
EQ AMP
J201
IC303
3 1
PHONO L
CD L
J202
IN L
TAPE/MD
REC OUT L
J300
TV/LD AUDIO IN L
AUDIO IN L
VIDEO2
AUDIO OUT L
J301
AUDIO IN L
VIDEO1
AUDIO OUT L
J203
FRONT L
REAR L
5.1/DVD INPUT
CENTER
WOOFER
J299
AUDIO L
VIDEO 3
INPUT
VIDEO SELECT
VIDEO
IC201
J201 7 V3 IN
VCC 16
MONITOR OUT 1 M OUT IC202
-5V
IN 13 VEE 8 3
V1 IN REG
VIDEO 1
OUT OUT 15 V1 OUT
J202
VIDEO
IN 9 V2 IN SW1 14
VIDEO 2
OUT 11 V2 OUT SW2 10
SW5 2
J203
5.1/DVD
3 TV SW3 4
INPUT
TV/LD 5 LD SW4 6
09
DOLBY PROLOGIC
AUDIO SELECT MATRIX DECODER
IC302 IC401
LINE AMP
IC404
3 1
3 4 9
2
1
10 11
CONTROL
9
6 8
46 47 45
CONTROL
14 15 13
LINE AMP
IC301
3 1
AUDIO SELECT
IC300
RDS DECODER
IC452
1 4
RDS DATA
2
7
4
RDS CLK
16
6 8
13 14
10 11
X450
4.43MHz
9
CONTROL
14 15 13
+5V
2
-15V
30 24 21 23 22 15 38 19 18 20 9 17
2 V-A
3 V-B
SYSTEM
CONTROL
IC103(1/2)
4 V-E
27 V INH
– 7 –
SURROUND
PROCESSOR
IC400
L OUT L OUT
41 11 22
S OUT
SL OUT
20k 5k/7k VOL/
39 13 ADM 20
L.P.F MUTE
L.P.F
C OUT
DEC
38
3 2 4
6 49 41 52 51
LED
VOL LED 55 DRIVE
Q150
36 37
Q1101
IN/OUT
BUFFER
SELECTOR
IC403
L.P.F
IC306
3
30 28 RY301
1
2
29
MUTE
Q300
27 25
26 IC304
3 1
24 22
23 MUTE
Q304
CONTROL
MUTE
14 15 13
Q305
IC305
5 7
MUTE
Q302
TONE CONTROL
IC502
BASS 3
2
4
5
TREBLE 6
MUTE SW
LEVEL SHIFT
Q411
Q414
BOOST
9 8 10
+5V DET
Q501,502
D136
LED SW LED SW
Q108 Q143
BASS
BOOST
RELAY
DRIVE
Q308
UP
VOL
3 8
MOTOR
DOWN
2 IC106 7
Y SWITCH
IC252
3 TV V1 O 15
Y
TV/LD 13 V1 I
C 13 V1 I
J253
14 SW1
Y 10 SW2 M O 1
4 SW3
S-VIDEO 5.1/DVD
6 SW4 V3 O 7
IN INPUT
C
C SWITCH
IC251
3 V1 O 15
J252 Y TV
VIDEO 1
3 TV
C
13 V1 I
14 SW1
10 SW2 M O 1
J204
4 SW3
S-LINK
6 SW4 V3 O 7
CTRL A1
– 8 –
STR-DB725/DB825
BALANCE VOLUME
RV402 RV401
L
C
A
POWER
W SECTION
SL
UP
M
DOWN
• RCH is omitted
• Signal Path
: FM
: PHONO
: CD
: VIDEO
P RY
B
CTRL A1
POWER
SIRCS SECTION
Y
J252
VIDEO 1
C
S-VIDEO
Y
OUT
J251
MONITOR
C
Y
J298
VIDEO 3
INPUT
C
S-VIDEO