Sony XR-4880, Service Manual

Page: 17 / 35

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IC331 TDA7462D
SE3L
SE3R
MUTE
SDA
SCL
PAUSE
OUT FL
OUT FR
OUT RL
OUT RR
SUBOUT–
VDD
GND
CREF
SE1L
SE1R
MD+
MD–
CDL+
CDL–
CDR–
CDR+
PDR
PDGND
PDL
SE2L
SE2R
INPUT
GAIN &
AUTO
ZERO
PAUSE
DETECT
INPUT MUL
TIPLEXER &
MIXING ST
AGE
REAR SIDE SELECTOR
FRONT SIDE
SELECTOR
LOUDNESS
CONTROL
CIRCUIT
INPUT
GAIN
BEEP
LOUDNESS
CONTROL
CIRCUIT
SOFT
MUTE
VOLUME
CONTROL
CIRCUIT
COMPANDER
TREBLE/
BASS
CONTROL
CIRCUIT
SUBWOOFER
OUT
FADER
SUBWOOFER
LP
IIC
BUS
DIGITAL CONTROL CIRCUIT
POWER
SUPPLY
FRONT
FADER
FRONT
FADER
REAR
FADER
REAR
FADER
VOICE BANDPASS
HP LP
SDA
SCL
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
+
–
+
–
+
–
+
–
OVER VOLTAGE
PROTECT
REGULATOR
1 2 3 4 5 6 7 8 9 10 12 11
NC
MODE2 MODE1
STB
VDD AMP
VCC ANT
COM
AM FM
GND
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
TA
B
PW
-GND
OUT2–
ST
-BY
OUT2+
Vcc1
OUT1–
PW
-GND1 OUT1+
SVR
IN1 IN2
S-GND
IN4 IN3
AC-GND
OUT3+
PW
-GND3 OUT3–
Vcc2
OUT4+
MUTE
OUT4–
PW
-GND4
DIAGNOSTICS OUT
IC661 BA3918-V2
IC751 TDA7385
• IC Block Diagrams – MAIN Board –
IC21 TB2118F (EL)
SECTION 6
DIAGRAMS
IC301 CXA2509AQ-T4
VDD
AMP
AMP
AMP
VDD2
1 2 3 4 5 6 7 8 9 10
24 23 22 21 20 19 18 17 16 15
11
12
14 13
XO
OSC
CE
DIN
CK
DOUT
SR
I/O-1 I/O-2
OUT-1 OUT-2
VDD2
IFC VDD FM IN AM IN D-GND FM CP OUT VT AM CP OUT VCC REG
A-GND
XI
SERIAL
INTERFACE
I/O
PORT
OSCILLATOR
ON/OFF
BUFFER
REFERENCE
DIVIDER
PHASE
COMPARATOR
20BIT
IF COUNTER
PRESCALLER
12BIT
PROGRAMMABLE
COUNTER
+ –
REGULATOR
18BIT
18BIT
22BIT
40BIT SHIFT
REGISTER
REF
VCC
SEEK/RECP SEEK/RECP
+ –
SIG
4BIT SWALLOW
COUNTER
OUTPUT
PORT
+
+
+
–
+
–
+ –
+ –
+ –
1 2 3 4 5 6 7 8 9 10
20
19
18
17
16
15
14
13
12
11
21 22 23 26 27 28 29 30
31
32
33
34
37
38
39
40
24 25
PBFB1
PBRIN1
PBREF1
PBFIN1
35
36 PBGND
VCT
PBFIN2
PBREF2
PBRIN2
PBFB2
PBEQ1
PBOUT1
VCC
TAPEIN1
AUXIN1
MSLPF
LINEOUT1
NC NC
G2FB
G1FB
MSTC
DGND
MSOUT
NC
NC
INSW
TAPESW
MSMODE
DRSW
MSSW NC NC LINEOUT2 DIREF AUXIN2 TAPEIN2 PBEQ2 PBOUT2 GND
F2
120
µ
/70
µ
X1
X1
VCT
+
F1
120
µ
/70
µ
24dB
F3
LPF
VCC
DETECT
MS ON/
OFF
FWD/RVS
TAPE EQ
TAPE/AUX
NR BIAS
24dB
MS
MODE
T2
T1
1
2
3
4
5 6
7
8
9
10 VCC
IN2
S-GND
IN1
NC
NC
OUT2
NC
P-GND
OUT1
CONTROL
CIRCUIT
MOTOR
DRIVE
CIRCUIT
BUFFER
BUFFER
IC351 LB1930M-TLM