Sony XR-C750 Service Manual ▷ View online
– 47 –
• IC Block Diagrams
IC91 BU2624FV
IC61 HA1218FP
IF
AMP
LPF
IF AGC
DETECTOR
PULSE
DETECTOR
HPF1
LPF
AF
AMP
AF
AGC
OR
HPF
NOISE
AGC
PULSE
DETECT
1
PULSE
DETECT
2
GATE PULSE
GENERATOR
GENERATOR
REFERENCE
CURRENT
CIRCUIT
SW2
SW1
REFERENCE
VOLTAGE
CIRCUIT
PHASE
CURRENT
LEVEL
DIFFERENCE
DETECTION
SW3
HIGH PASS AMP
(WAVEFORM COMP.)
SW4
REFERENCE
CURRENT CIRCUIT
(WAVEFORM COMP.)
SW5
BUFFER
AMP
11
10 9
12
14
13
15
16
1
2
4
5
3
6
7
8
GATE PULSE 2
GATE PULSE 1
VCC
GND
IFAGC
BIAS1
AF-IN
BIAS2
PHASE
HOLD
GND
HP
IF-IN
AFAGC
IFDET
VCC
VTH
GATE
WF
AFOUT
PHASE
DET
PRESCALER
MAIN
COUNT
IF COUNT
CTL
20BIT COUNT
SHIFT REGISTER LATCH
REFERENCE
DIVIDER
I/O
CTL
1
2
4
5
6
7
9
10
20
18
17
16
15
14
13
12
11
11
19
XIN
CE
CK
DA
CD
P0
P1
P3
XOUT
VSS
PD
VDD
FMIN
AMIN
P2
IFIN
SD
P4
P4
– 48 –
IC301 CXA1946BQ
IC201 LB1638M
IC231 CXA2511AQ
CONTROL LOGIC
1
2
3
4
5
10
9
8
7
6
N. C.
OUT1
VS
OUT2
N. C.
GND
IN1
VCC
IN2
GND
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
32
33
34
35
36
37
38
39
40
NR
NR
NR BIAS
TAPE/AUX
TAPE EQ
FWD/RVS
MS MODE
NR MODE
DET
10
9
8
7
6
5
4
3
2
1
LPF
VCT
+ -
T2
X1
X1
T1
+ -
F3
VCC
OFF/
B/C
OFF/
B/C
+
-
F1
F2
+
-
120
µ
/70
µ
120
µ
/70
µ
MS ON/
OFF
PBFB2
PBRIN2
PBREF2
PBFIN2
VCT
PBGND
PBFIN1
PBREF1
PBRIN1
PBFB1
PBEQ1
PBOUT1
VCC
TAPEIN1
AUXIN1
MSLPF
LINEOUT1
TCH1
TCL1
G2FB
PBEQ2
PBOUT2
GND
TAPEIN2
AUXIN2
DIREF
LINEOUT2
TCH2
TCL2
MSSW
MSMODE
DRSW
TAPESW
INSW
NRSW
NRMODE
MSOUT
DGND
MSTC
G1FB
+
-
36
35
34 33
31
30
25
26
27
28
29
32
1
2
3
4
5
6
7 8 9 10 11
12
13
14
15
16
17
18
19
20
21
22
23
24
37
38
39
40
41
42
43
44
45
46
47
48
GAIN12
GAIN11
IN11
IN12
IN13
IN14
IN21
IN22
IN23
IN22
IN23
IN24
GAIN21
GAIN22
FNTO1
REO1
REO1
CE
CLK
CLK
DGND
GND
VCC
VCT
DATA
TIMER
REO2
FNTO2
GAIN13
4
LDLC1
LDHC1
INAO1
VRIN1
VOUT1
TIN1
TCLC1
TCLC11
TCLC12
TCO1
FDIN1
GAIN234
LDLC2
LDHC2
INAO2
VRIN2
VOUT2
TIN2
TCHC2
TCLC21
TCLC22
TCO2
FDIN2
LOUD
VOLUME
8dB STEP
VOLUME
1dB STEP
VCTBUFF
VCTBUFF
VCTBUFF
TONE
FADER
INPUT SW
LATCH
LATCH
CONTROL
ZCDET
SHIFT
REGISTER
45k
45k
VCTBUFF
VCTBUFF
VCTBUFF
VOLUME
1dB STEP
LOUD
INPUT SW
TONE
FADER
VOLUME
8dB STEP
– 49 –
IC305, 405 TDA8574 (T)
IC381 BU4052BCFV
IC382 CXA1846N
REFERENCE
REFERENCE
VCCL
VCCL
VCCL
INL
SVRL
INML
INMR
SVRR
INR
VCCR
VCCR
VCCR
BUFFER
BUFFER
BUFFER
BUFFER
LIFT
AMP
SIGNAL
AMP
LIFT
AMP
SIGNAL
AMP
CL+
CL–
LGND
OUTL
OUTR
RGND
CR–
CR+
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1
5
2
4
3
6
7
8
SELECT A
SELECT B
3
2
1
0
3
2
1
0
INH
Y1
Y3
Y
Y1
Y0
VEE
VSS
X3
X0
X
X1
X2
VDD
A
B
9
12
14
15
11
16
13
10
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
1dB STEP
VOLUME
8dB STEP
VOLUME
1dB STEP
VOLUME
8dB STEP
VOLUME
VCT
BUFFER
LATCH
SHIFT
REGISTER
LATCH
CONTROL
ZC
DET
+
–
+
–
–
INP 1
INN 1
VCT 1
INAO 1
VRIN 1
OUT 1
N.C.
GND
VCT
VCC
INP 2
INN 2
VCT 2
INAO 2
VRIN 2
OUT 2
CE
DATA
CLK
INIT
– 50 –
IC571 BA8270F
IC601 BA3918-V3
BUS ON
SWITCH
RESET
SWITCH
BATTERY
SWITCH
3
4
5
6
2
1
10
9
8
7
11
12
13
14
BUS ON
RST
BATT
CLK
VREF
DATA
GND
VCC
RST
BUS ON
BUS ON
CLK IN
BU IN
DATA IN
DATA OUT
1
2
3
4
5
6
7
8
9
10
11
12
GND
FM 8.7V
AM 8.7V
COM 8.7V
ANT
VCC
AMP
VDD 5.6V
STB
MODE 1
MODE 2
N.C.
REGULATOR
EXCESSIVE
VOLTAGE
PROTECTOR
VCC
VCC
VCC
VCC
VCC
VCC
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