Sony ST-SE370 Service Manual ▷ View online
7
ST-SE370
4. Forced RESET
Clears all the RAMs and sets the initial state.
(1) Turn OFF the power.
(2) While pressing 5 and BAND together, turn ON POWER .
(2) While pressing 5 and BAND together, turn ON POWER .
5. Language Change
1. Turn OFF the power.
2. While pressing 2 , turn ON POWER .
2. While pressing 2 , turn ON POWER .
6. Change-over of AM Tuner Step between 9 kHz and 10 kHz (US model only)
• A step of AM channels can be changed over between 9 kHz and 10 kHz.
1. Turn OFF the power.
2. While pressing 9 or -, turn ON POWER .
1. Turn OFF the power.
2. While pressing 9 or -, turn ON POWER .
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
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
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-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)
(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
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
Ω
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)
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