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Model
ST-SE370
Pages
21
Size
1.22 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
st-se370.pdf
Date

Sony ST-SE370 Service Manual ▷ View online

8
ST-SE370
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”  indication
lights on fluorescent indicator tube.
Adjustment Location:
[MAIN BOARD] — Component Side —
FM RF signal
generator
set
FM ANTENNA
75 
 coaxial
(TB101)
Carrier frequency  : 98 MHz
Modulation
: 1 kHz, 40 kHz deviation
Output level
: 6.3 mV (76dB
µ
)
(75 
 open)
IC201
CN101
RV201
FM SIGNAL LEVEL
Adjustment
ST-SE370
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)
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 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 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
: Can not be measured.
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
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 –
1
IC701 
eg
 (X2)
– MAIN Board –
2
IC801 
qf
 (OSCO) (AEP, UK model only)
5.4 Vp-p
4.2 MHz
4.8 Vp-p
4.332 MHz
• Circuit Boards Location
MAIN board
TUNER (PACK)
AC SW board
DISPLAY board
SW board
ENCORDER board
ST-SE370
10
10
5-2.
PRINTED  WIRING  BOARDS  – MAIN Section –
 See page 9 for Circuit Boards Location.
IC301
D-6
IC801
B-7
IC901
C-7
Q301
E-7
Q302
D-7
Q801
B-7
Q901
C-8
Ref. No.
Location
Ref. No.
Location
D901
D-5
D902
D-5
D903
C-5
D904
C-5
D905
C-5
D906
A-5
D907
C-7
D908
C-6
IC201
D-9
• Semiconductor Location
MAIN BOARD
2
1
AC SW BOARD
POWER
1
2
1-681-067-
11
(11)
PC901
AC IN
BLU
BRN
2
1
(CHASSIS)
(EXCEPT US)
(US)
*
 
NOT REPLACEABLE : BUILT IN TRANSFORMER
*
 POWER TRANSFORMER
9
8
A
DISPLAY BOARD
CN702
B
DISPLAY BOARD
CN701
1
7
E
E
1
8
16
9
1
8
16
9
1
4
8
5
(AEP, UK)
EXCEPT
AEP, UK
E
E
EXCEPT
AEP, UK
(AEP, UK)
EXCEPT
AEP, UK
EXCEPT
AEP, UK
L
R
LINE OUT
1-681-063-
11
(11)
75
COAXIAL
AM
FM
TUNER PACK
SUPPLIED WITH
THE ASSEMBLED
BLOCK
ANTENNA
(AEP, UK)
A
B
C
D
E
1
2
3
4
5
6
7
8
9
10
TB101
(Page 12)
(Page 12)
ST-SE370
11
11
5-3.
SCHEMATIC  DIAGRAM  – MAIN Section –
 See page 9 for Waveform.
 See page 14 for IC Block Diagram.
R904
R303
R310
R903
CNP951
C352
C351
L351
R908
R910
R909
R907
R906
R905
C906
C909
D904
D
9
03
C903
C904
C908
R902
D907
C907
C911
D908
R804
D902
D901
C901
C902
C951
CNP901
JW902
JW901
CN951
CNP701
C910
R901
R805
R803
X801
C806
C
807
C803
R802
C802
C805
C801
C804
C808
R801
C201
C202
C
203
R202
C207
RV201
C204
C206
C205
C102
C101
CNP702
C301
C319
R301
R306
C304
C303
R305
R304
R302
C302
R308
C306
JW302
C308
C307
IC301(2/2)
R309
R311
R312
R321
Q301
L352
R352
R351
JW305
JW303
JW301
R307
CN101
J301
PT901
PC901
S901
JW306
JW304
Q302
R319
R320
Q801
C104
C103
R105
R104
R201
C305
TB101
IC301(1/2)
D906
D
905
IC201
IC801
Q901
C905
IC901
EP901
R900
47k
100k
470
100k
2P
1000p
1000p
470
470
470
470
470
470
220
50V
47
16V
11ES2
11E
S2
47
50V
47
50V
10
50V
47k
11ES2
470
6.3V
0.47
50V
1SS133
220
11ES2
11ES2
0.01
0.01
1000p
250V
2P
2P
9P
10
50V
47k
100
2.2k
4.332MHz
82p
47p
0.01
47
47
16V
560p
0.01
0.01
2.2
50V
10k
330p
0.01
0.01
100
0.1
50V
22k
0.01
0.01
47
16V
10
50V
0.01
8P
4.7
50V
220
16V
100k
10k
10
50V
10
50V
10k
100k
100k
4.7
50V
4.7k
100p
4.7
50V
4.7
50V
NJM4558D
470
1k
1k
10
2SD2144S
47k
47k
4.7k
15P
2SD2144S
100
100
2SC1740S
10
50V
0.01
10k
10k
470
100p
NJM4558D
MTZJ-T-72-6.2
M
TZJ-T-72-3
0
LA1235
BU1924
BLIN4M
2200
35V
LA5667
3.3M
1/2W
A1
A2
A3
A4
A1
A4
Z1
Z2
Z1
Z2
A2
A3
+5V
GND
POWER
CLK
DATA
D-IN
RDS-C
-30V
CE
ST
AST
MUTE
EON
G
G
(CHASSIS)
230V
120V
100V
OR
0V
(CHASSIS)
QUAL
RDDA
IN
VDD
VDD
RDCL
TEST
MODE
IFIN
MUTE
VCC
SIG.
GND
RESET
5V-IN
+5V
+13V-IN
+13V
L
R
LINE OUT
* NOT REPLACEABLE:
BUILT IN TRANSFORMER
TRANSFORMER
POWER
(US)
(EXCEPT US)
(US)
AC IN
POWER
(EXCEPT AEP,UK)
(AEP,UK)
(AEP,UK)
(EXCEPT AEP,UK)
MUTING
MUTING
LINE AMP
(AEP,UK)
(EXCEPT AEP,UK)
(EXCEPT AEP,UK)
(AEP,UK)
MUTING
SWITCH
+5V,+13V
REGULATOR
MUTE
NULL
LIMITER
RDS
DECODER
SWITCH
FM DET
FM SIGNAL
DETECTOR
THE ASSEMBLED
BLOCK
(
(
SUPPLIED WITH
(CHASSIS)
AM
FM
75
COAXIAL
ANTENNA
SCOUT
CIN
VSSA
VREF
VSSD
TS7
OSCO
OSCI
FL2
FL1
SIGNAL
RDS-DATA
10
µ
H
10
µ
H
(Page 13)
(Page 13)
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