Sony STR-DB725 / STR-DB825 Service Manual ▷ View online
– 43 –
3-19. IC BLOCK DIAGRAMS
IC001, 601, 701 uPC2581V
PROTECTOR
DRIVE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
PRE
DRIVE
PRE
DRIVE
BIAS CIRCUIT
REG
DRIVE
MUTE
+VOUT1
–VOUT1
COMP1
NF1
IN1
GND
IN2
NF2
COMP2
–VOUT2
+VOUT2
VCC1
VCC2
VEE
IC106 BA6208
1
2
3
4
5
6
7
8
9
NC
OUTPUT 2
Vcc
GND
NC
INPUT 2
INPUT 1
NC
MOTOR
DRIVE
MOTOR
DRIVE
REG
SWITCH
SWITCH
OUTPUT1
IC251 NJM2296D
9
S5
S6
S7
S4
S1
S2
S3
Vout1
Vout2
Vout3
V-
GND
SW3
SW2
SW1
SW5
SW4
Vin1
Vin2
Vin3
Vin4
Vin5
V+
10
11
12
13
14
15
16
1
5
2
3
4
6
7
8
IC302 LC7822
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CONTROL
LATCH
SHIFT RESISTOR
LEVEL SHIFT
CL
DI
CE
VEE
OUT
IN
OUT
IN
OUT
IN
VSS
S
RESET
VDD
OUT
IN
IN
OUT
IN
OUT
IN
– 44 –
IC400 CXA8081S
IC401 CXA8079S
R
B
R B
DC-RS
AGND
DC-OT
NR-R
NR-C
RS-OUT
LS-OUT
R-OUT
L-OUT
R
B
VSS
CLK
D
ATA
ENABLE
DC-LS
DC-IN
VCC
L-IN
R-IN
S-IN
VREF
FCL-IN
FCR-IN
FCLS-IN
FCRS-IN
OSC
VDD
PDM
PDM-COUT
SRA1-8K
20KH-L.P.F.
DEC
5K/7K-L.P.F.
B-NR
R-STEREO
VOL/MUTE
RS-TRIM
LS-TRIM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
INV-PHASE
R+DELAY
L+DELAY
-6dB
L+R
L-R
P
B
B
P
B
B
20K
20K
20K
20K
48
VCS2
VCS1
VCS-TH
L+R-RC
T
L-R-RCT
DCUT
DCUT
R-BPF3
R-BPF2
R-BPF1
CT
-OUT2
CT
-IN2
MIXOUT
C-OUT
S-OUT
R-OUT
L-OUT
VCC
CM-CAP
FCC-IN2
ENABLE
D
ATA
CLK
OSC1
NS-BPF1
NS-BPF2
VREF
S-DCUT
C-DCUT
L-DCUT
R-DCUT
V
REF-BUF
L-IN
R-IN
GND
CT
-OUT1
CT
-IN1
FCC-IN1
L-BRF1
L-BRF2
L-BRF3
DCUT
DCUT
R-RCT
VCR-TH
VCR1
VCR2
47 46 45
44 43
42
41
40
39
38
37
36
35
34
33
32
31
30 29 28
L+R-RECT
27
26
25
P.S
VCS-LOG
OSC
DEC
N-GEN
N-BPF
N-OH
DIV
BAL-DET
BALCONT
VREF
VR
VR
VCRX8
COMB-NET
CMODE
SMUTE
C-TRIM
P
B
P
B
P
B
P
B
R
B
R
B
R-B.P.F.
L-B.P.F.
L-R-RECT
R-RECT
L-RECT
VLR-LOG
DUAL-TIME
P.S
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CONTROL
LATCH
SHIFT RESISTOR
LEVEL SHIFT
CL
D1
CE
VEE
L1
L2
L COM1
L3
L4
L COM2
L5
L6
L COM3
L7
R1
R2
R COM1
R3
R4
R COM2
R5
R6
R COM3
R7
L COM4
VSS
S
RES
VDD
R COM4
IC403 LC7823
– 45 –
IC452 BU1922
QUALITY BIT
GENERATOR
DEFFERENTIAL
DECODER
BIPHASE
SYMBOL
SYMBOL
DECODER
OSCILLATOR
AND
DIVIDER
57kHz
BANDPASS
(8th ORDER)
CONTAS LOOP
VARIABLE AND
FIXED DIVIDER
FIXED DIVIDER
REFERENCE
VOLTAGE
ANTI-
ALIASING
FILTER
CLOCKED
COMPARATOR
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
RECONSTRUCTION
FILTER
14
15
16
13
12
11
10
9
3
2
1
4
5
6
7
8
CLOCK REGENERATION
AND SYNC
VP1
RDCL
TS7
OSCO
OSCI
V
DDD
V
SSD
TEST
TSTL
D
QUAL
RDDA
Vref
MUX
V
DDA
V
SSA
CIN
SCOUT
IC502 TC9184P
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
S. DATA
T. LAT
+9V
–9V
GND
S. CLK
TONE
CE
BASS +
BASS –
COM
TREBLE –
TREBLE +
BASS +
BASS –
COM
TREBLE –
TREBLE +
1
2
3
4
5
6
7
8
V+
VSB/SESIN
VSA
RESET
GND
OUTC
VSC
CR
VREF
+
–
–
+
–
+
–
+
Q
R
S
IC901 NJM2103D
– 46 –
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
—
O
O
O
O
O
I
O
O
I
—
I
—
—
I
—
O
O
O
O
I
O
I
I
—
I
O
O
I
I
I
I
I
—
I
O
I
I
I
—
Power Supply (+5 V)
Video IC SW1
Video IC SW2
Video IC SW3
Ground through resister
S Mute
Not used (Connected to ground)
A-class mute
Dolby latch
System reset
System clock (4.19 MHz)
System clock (4.19 MHz)
Ground
Not used
RDS data input
+5 V
Tone latch
Serial clock
Serial data
Serial latch
Auto stop
Tuner mute
Stereo
Tuner data in
A/D ground (0 V)
SIRCS input
Video IC SW4
S-LINK CONTROL A1 latch
Version
A/D key 4
A/D key 3
A/D key 2
A/D key 1
A/D power supply (+5 V)
A/D reference voltage (+5 V)
S-LINK CONTROL A1 data output
S-LINK CONTROL A1 data input
RDS clock input
STOP
Ground
VDD.+5V
V-A
V-B
V-E
—
S.MUTE
(S.MUTE)
AC.MUTE
D.LATCH
RESET
X2
X1
VSS.GND
NP
RDS.DAT.IN
VDD.+5V
T.LATCH
S.CLOCK
S.DATA
S.LATCH
AUTO.STOP
TUNER MUTE
STEREO
IF.DATA.IN
GND.A/D
SIRCS
V INH
CTRLA1LAT
VERSION
KEY4/SMETER
KEY3
KEY2
KEY1
VDD.A/D.+5V
VREF.A/D.+5V
CTRL-A1.OUT
CTRL-A1.IN
RDS.CLK.IN
STOP
VSS.GND
Pin No.
Pin Name
I/O
Function
3-20. IC PIN FUNCTIONS
• IC103 uPD780208GF (DISPLAY BOARD)
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