Sony ST-SE570 Service Manual ▷ View online
8
ST-SE570
SECTION 4
ELECTRICAL ADJUSTMENTS
FM Signal Level Adjustment
Procedure:
1. Tune the set to 98 MHz.
2. Push the DISPLAY button for digital signal meter indication.
3. Adjust RV201 to the place where level and “70dB
1. Tune the set to 98 MHz.
2. Push the DISPLAY button for digital signal meter indication.
3. Adjust RV201 to the place where level and “70dB
M” indica-
tion lights on fluorescent indicator tube.
Adjustment Location:
[MAIN BOARD] — Component Side —
FM RF signal
generator
generator
set
FM ANTENNA
75
75
Ω
coaxial
(TB101)
Carrier frequency : 98 MHz
Modulation
Modulation
: 1 kHz, 40 kHz deviation
Output level
: 6.3 mV (76dB
µ
)
(75
Ω
open)
IC201
CN101
RV201
FM SIGNAL LEVEL
Adjustment
ST-SE570
9
9
SECTION 5
DIAGRAMS
5-1.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
(In addition to this, the necessary note is printed in each block)
(In addition to this, the necessary note is printed in each block)
Note on Printed Wiring Board:
•
•
X
: parts extracted from the component side.
•
: Pattern from the side which enables seeing.
• Indication of transistor.
B
These are omitted.
C
E
Q
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
2
: nonflammable resistor.
•
C
: panel designation.
•
U
: B+ Line.
•
V
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark : FM
no mark : FM
∗
: Can not be measured.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
Note: The components identified by mark
0
or dotted line
with mark
0
are critical for safety.
Replace only with part number specified.
• Waveforms
– DISPLAY Board –
– DISPLAY Board –
1
IC701
qa
(X2)
– MAIN Board –
2
IC801
qf
(OSCO)
4.3 Vp-p
238.6 ns
4.8 Vp-p
4.332 MHz
• Circuit Boards Location
MAIN board
TUNER (PACK)
TRANSFORMER board
AC SW board
DISPLAY board
ENCORDER board
SW board
ST-SE570
10
10
L
R
LINE OUT
1
8
16
9
E
E
E
E
(CHASSIS)
1
3
CNJ251
EON CONTROL
OUT
1
4
8
5
1
7
E
E
1
8
16
9
9
8
A
DISPLAY BOARD
CN702
B
DISPLAY BOARD
CN701
MAIN BOARD
75
Ω
COAXIAL
AM
FM
TUNER PACK
SUPPLIED WITH
THE ASSEMBLED
BLOCK
ANTENNA
TB101
1-681-057-
11
(11)
TRANSFORMER BOARD
AC SW BOARD
POWER
1
2
1-681-061-
11
(11)
2
1
5
1
*
*
NOT REPLACEABLE :
BUILT IN TRANSFORMER
POWER TRANSFORMER
2
1
PC901
AC IN
BRN
BLU
1-681-062-
11
(11)
1
5
A
B
C
D
E
F
1
2
3
4
5
6
7
8
9
10
5-2.
PRINTED WIRING BOARDS – MAIN Section –
•
See page 9 for Circuit Boards Location.
IC301
E-6
IC801
B-7
IC901
D-7
Q301
E-8
Q302
E-8
Q303
E-7
Q304
E-7
Q801
C-8
Q901
C-8
Ref. No.
Location
Ref. No.
Location
D251
E-5
D901
E-5
D902
D-5
D903
C-5
D904
C-5
D905
C-6
D906
B-5
D907
C-7
D908
C-7
IC201
E-9
• Semiconductor Location
(Page 12)
(Page 12)
ST-SE570
11
11
D904
R905
R906
CN101
C351
L351
L352
C352
C951
CN951
CNP951
CNP901
CNP952
R901
Q303
Q301
Q304
Q302
R316
C251
R251
CNJ251
D251
CN952
R909
R908
C906
D
905
D
90
6
C910
R
904
R
903
C909
C905
D902
C902
D901
C901
R902
C908
C907
D907
C911
D908
C803
C806
R803
R805
R804
C807
R802
C802
C805
R801
C808
R104
R105
C104
C103
CNP702
CNP701
IC901
R308
C308
R310
R311
R321
R306
C304
R304
R302
C302
R301
C319
R305
C303
R303
C301
R319
R320
C307
R307
C305
R309
R315
R202
C205
C206
C204
RV201
C207
C201
R201
C202 C203
C804
C801
IC301(2/2)
S901
PC901
PT901
C306
Q801
X801
Q901
TB101
C101
C102
D
903
R318
R317
IC301(1/2)
R312
R352
CNJ301
IC201
R351
IC801
C903
C904
11ES2
1k
1k
15P
0.001
0.001
0.001
250V
2P
2P
2P
5P
47k
2SD2144S-T
2SD2144S-T
P-UVW
2SD2144S-T
2SD2144S-T
P-UVW
220
0.01
10
3P
1SS133T
5P
1k
1k
220
50V
50V
M
T
ZJ-T
-72
-27
M
TZ
J-T
-72
-6.8
10
50V
47k
10
0k
47
16V
2200
35V
11ES2
0.01
11ES2
0.01
47k
10
50V
470
6.3V
11ES2
0.47
50V
1SS133T
0.01
82p
2.2k
100
220
47p
47
47
16V
560p
10k
2.2
50V
50V
10k
10k
10
50V
0.01
8P
9P
LA5667
4.7k
4.7
50V
50V
220
1k
10
10k
10
50V
100k
100k
4.7
50V
50V
100k
220
16V
16V
10k
10
50V
100k
4.7
50V
50V
100
100
4.7
50V
50V
4.7k
100p
220
220
100
47
16V
0.01
0.01
22k
0.1
50V
50V
330p
470
0.01
0.01
0.01
0.01
NJM4558D
100p
2SC1740S
4.332M
H
z
BN1L4M
0.01
10
50V
11
ES
2
1k
1k
NJM4558D
1k
47k
2P
LA1235
47k
BU1924
47
50V
47
50V
A1
A4
A1
A2
A3
A4
AA1
AA2
AA3
AA4
AA6
AA7
AA8
AA1
AA1
AA2
AA4
AA5
AA6
AA7
AA8
AA3
A2
A3
AA5
POWER
CLK
DATA
D-IN
RDS-C
CE
ST
AST
MUTE
EON
RDS-D
SI
F
F
GND
+5V
-30V
G
G
QUAL
RDDA
IN
VDD
VDD
RDCL
TEST
MODE
GND
RESET
5V-IN
+5V
+13V-IN
+13V
IFIN
MUTE
VCC
SIG.
(CHASSIS)
L
R
LINE OUT
POWER
AC IN
* NOT REPLACEABLE:
BUILT IN TRANSFORMER
EON CONTROL OUT
TRANSFORMER
POWER
MUTING
MUTING
MUTING
MUTING
LINE AMP
NULL
LIMITER
FM SIGNAL
DETECTOR
SWITCH
FM DET
RDS
DECODER
MUTING
SWITCH
+5V,+13V
REGULATOR
MUTE
THE ASSEMBLED
BLOCK
(
(
SUPPLIED WITH
(CHASSIS)
AM
FM
75
Ω
COAXIAL
ANTENNA
SCOUT
CIN
VSSA
VREF
VSSD
OSCI
OSCO
TS7
10
µ
H
10
µ
H
5-3.
SCHEMATIC DIAGRAM – MAIN Section –
•
See page 9 for Waveform.
•
See page 14 for IC Block Diagram.
(Page 13)
(Page 13)
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