Sony XR-C5120RA Service Manual ▷ View online
9
TUNER SECTION
0 dB=1
µ
V
Cautions during repair
When the tuner unit is defective, replace it by a new one be-
cause its internal block is difficult to repair.
cause its internal block is difficult to repair.
Note:
Adjust the tuner section in the sequence shown below.
1. FM Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM RDS S Meter Adjustment
4. MW Auto Scan/Stop Level Adjustment
2. FM Stereo Separation Adjustment
3. FM RDS S Meter Adjustment
4. MW Auto Scan/Stop Level Adjustment
FM Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
1. Set to the test mode. (See page 8)
2. Push the
1. Set to the test mode. (See page 8)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Adjust with the volume RV2 on TU1 so that the “FM” indica-
tion turns to “FM0” indication on the display window.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
But, in case of already indicated “FM0”, turn the RV2 so that
put out light “0” indication and adjustment.
Display
Adjustment Location: See page 11.
FM Stereo Separation Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
FM Stereo
Level meter
Level meter
signal generator
connection
reading (dB)
output channel
L-CH
L-CH
A
B
R-CH
L-CH
Adjust RV4 on TU1
for minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU1
for minimum reading.
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 30 dB
Adjustment Location: See page 11.
SHUF
SHUF
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
Output level
: 70 dB (3.2 mV)
Mode
: stereo
Modulation
: main: 1 kHz, 20 kHz deviation (26.7%)
sub: 1 kHz, 20 kHz deviation (26.7%)
sub: 1 kHz, 20 kHz deviation (26.7%)
:
19 kHz pilot: 7.5 kHz deviation (10%)
0.01
µ
F
set
antenna jack (J1)
+
–
–
AUDIO OUT jack (CNJ151)
level meter
10 k
Ω
FM RF signal
generator
Carrier frequency
: 98.0 MHz
Output level
: 22 dB (12.6
µ
V)
Mode
: mono
Modulation
: 1 kHz, 22.5 kHz deviation (30%)
0.01
µ
F
set
antenna jack (J1)
10
MW Auto Scan/Stop Level Adjustment
Make this adjustment after “FM Auto Scan/Stop Level Adjust-
ment”.
Setting:
ment”.
Setting:
[SOURCE]
button: MW
Procedure:
1. Set to the test mode. (See page 8)
2. Push the
1. Set to the test mode. (See page 8)
2. Push the
[SOURCE]
button and set to FM.
3. Push the
[MODE]
button and set to MW.
Display
4. Adjust with the volume RV1 on TU1 so that the “MW” indi-
cation 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
FM RDS S Meter Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
1. Set to the test mode. (See page 8)
2. Push the
1. Set to the test mode. (See page 8)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Push the
[6]
button.
4. Adjust RV1 so that the display indication is “10.2”.
Display
Specification: Display indication: 10.0 to 10.4
Adjustment Location: See page 11.
Adjustment Location: See page 11.
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)
SHUF
SHUF
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)
TP
SHUF
TP
SHUF
11
11
Adjustment Location:
Tape Speed Adjustment
TU1
RV1 MW Auto Scan/Stop Level Adjustment
RV2 FM Auto Scan/Stop Level Adjustment
RV4 FM Stereo Separation Adjustment
RV1 FM RDS S Meter Adjustment
– SET UPPER VIEW –
12
12
XR-C5120RA
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – TUNER Section –
1
4
2
FM-ANT
AM-ANT
6
VCO
20
IF-COUNT/SEEK
19
SD
5
11
19
20
15
5
6 4
25
13
26
VT
13
AM-XTAL-IN
CK
3
CE
DOUT
XTOUT, XTIN
DIN
PLLSI
PLLCE
53
VSM
SD-IN
20
ST-MONO
5
TUNMUTE
AM-CPOUT
18
FM-CPOUT
VT
FM-VCO
16
AM-VCO
IF IN
10
SEEK
2
OSC OUT
PLLSO
27 28
PLLCKO
50
NOISE DET
32
NOISE ON
4
18
S-METER
17
15
12
LCH-OUT
RCH-OUT
AM-DET
22
FM-DET
FILTER
X1
10.25MHz
FM/AM PLL
IC1
05
MUTING
Q151
BUFFER
Q51
MUTING
CONTROL SWITCH
Q61
MUTING
Q121
BAND-PASS
FILTER
IC90
R-CH
D61
R-CH
FM/AM TUNER UNIT
TU1
SYSTEM CONTROLLER
IC501 (1/3)
LO/DX
11
SEEK
21
ST
LO/DX
J1
(FM/AM ANTENNA)
8
+8V-FM
FM B+
10
+8V-AM
AM B+
D1
9
+8V-TU
1
52
MTP
75
DAVN
RDS DECODER
IC51
INTERFACE
REGISTER
IIC BUS
SLAVE
TRANSCEIVER
OSCILLATOR
& CLOCK
X51
4.332MHz
4
8
5
OSCI
OSCO
10
9
SDA
SCL
DAVN
57 kHz
BAND-PASS
FILTER
CLOCKED
COMPARATOR
RDS/RDBS
DEMODULATOR
& DECODER
SIGNAL
QUALITY
DECODER
16
18
19
MPX
CIN
4
5
SC
OUT
MULTI
PATH
DETECTOR
20
2
LVIN
MPTH
Q90
NOISE DET
DISCHARGE
SWITCH
FM RDS
S-METER
RV1
DATA
CLOCK
DATA, CLOCK
(Page 13)
C
FM-L
(Page 13)
A
AM
(Page 13)
B
1, 24
SEEKOUT
• SIGNAL PATH
: FM
: MW/LW
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