Sony XR-4750RDS / XR-C450RDS Service Manual ▷ View online
– 17 –
AM (MW) Auto Scan/Stop Level Adjustment
Make this adjustment after “FM Auto Scan/Stop Level Adjustment”.
Setting:
Setting:
SOURCE button: MW
AM RF signal
generator
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level
30% amplitude
modulation by
1 kHz signal
Output level
: 33 dB (44.7
µ
V)
(50
Ω
)
set
AM dummy antenna
30
Ω
15 pF
65 pF
antenna jack (J1)
Procedure:
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button and set to MW.
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button and set to MW.
Display
3. Push the preset 3 button.
Display
3 999
MW
INTRO
4. Adjust with the volume RV1 on TU1 so that the “MW” indica-
tion turns to “MW0” indication on the display window.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
But, in case of already indicated “MW0”, turn the RV1 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: See page 18.
FM Signal Meter Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level
Output level
: 35 dB (56.2
µ
V)
Mode
: mono
Modulation
: no modulation
0.01
µ
F
set
antenna jack (J1)
Procedure:
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button and set to FM.
1. Set to the test mode. (See page 15.)
2. Push the SOURCE button and set to FM.
Display
FM
INTRO
REG
3. Push the 6 button.
4. Adjust RV1 so that the display indication is “160”.
4. Adjust RV1 so that the display indication is “160”.
Display
999 @
MW
INTRO
3 999
INTRO
INTRO
FM
Specification: Display indication: 158 to 162
Adjustment Location: See page 18.
– 18 –
Adjustment Location:
– SET UPPER VIEW –
Tape Speed
Adjustment
Adjustment
TU1
RV1
AM (MW) Auto Scan/Stop Level Adjustment
RV2
FM Auto Scan/Stop Level Adjustment
RV3
FM Noise Focus Adjustment
RV4
FM Stereo Separation Adjustment
RV1
FM Signal
Meter Adjustment
– 19 –
SECTION 6
DIAGRAMS
• IC Block Diagrams –MAIN Section –
IC1
TB2114F (EL)
VDD
SEEK/RECP
1
2
3 4
5
6
7
8
9
10
24 23
22
21 20
19
18
17
16
15
11 12
14 13
BUFFER
XTOUT
O
SC OUT
CE
DIN
CK
DOUT
SR
I/O-1
I/O-2
OUT-1
OUT-2
OUT-3
AM/FM IF
VDD
FM IN
AM IN
D-GND
FM CP OUT
VT
AM CP OUT
VCC
RF
A-GND
XTIN
BUS INTERFACE
I/O PORTS
OUT PORTS
OSC IN
OR
X'TAL OSC
ON/OFF
REFERENCE
COUNTER
PHASE
COMPARATOR
20BIT
IF COUNTER
2
MODULAS
PRESCALER
12BIT
PROGRAMABLE
COUNTER
AMP
AMP
AMP
+
–
RIPPLE
FILTER
18BIT
18BIT
22BIT
40BIT
SHIFT
SHIFT
RESISTER
REF
VCC
+
–
SIG
SEEK/RECP
4BIT
SWALLOW
COUNTER
PSC
N
DATA
IC3
TDA7330BD-013TR
COSTAS
LOOP
PLL
57kHz
PHASE
DECODER
DIFF
DECODER
CLOCK
RECOVERY
PLL
1.4675kHz
ON/OFF
OSCILLATOR
fx DIVIDER
TEST LOGIC
8th ORDER
SC-BANDPASS
FILTER
2nd ORDER
ANTIALIAS
FILTER
+
–
–
20
19
18
17
16
15 14
13
12
11
10
9
8
6
7
3
4
5
1
2
POR
TM
FSEL
T7
VCC
ARI
OUAL
RODA
ROCL
T57
MPXIN
VREF
CMP
FILOUT
GND
T1
T3
T4
OSCOUT
OSCIN
VCC
– 20 –
IC151
LC75373ED
+
–
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
+
–
+
–
+
–
–
+
–
–
+
–
–
+
–
+
–
DECODER
LATCH
SHIFT
REGISTER
CONTROL
–
+
+
–
–
1
2
3 4
5
6 7 8
9 10
20
19
18
17
16
15
14
13
12
11
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
43
44
LSELO
L4
L3
L3
L2
L1
VDD
R1
R2
R3
R4
R4
RSELO
RVRIN
RCOM
RT1
RT2
RT3
RTOUT
RSIN
RS1
RS2
RS3
RSOUT
RFIN
RFOUT
RROUT
VSS
CL
DI
CE
VREF
LROUT
LFOUT
LFIN
LSOUT
LS3
LS2
LS1
LSIN
LTOUT
LT3
LT2
LT1
LCOM
LVRIN
IC351
CXA2509AQ-T4
+
–
–
+
–
+
–
+
–
+ –
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 OUT2
VS
OUT1
GND
IN1
VCC
IN2
GND
CONTROL CIRCUIT
IC360
MM1322XFBE
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