Sony ST-SE570 Service Manual ▷ View online
7
ST-SE570
3. Entering the Factory Preset (In case perform just to write memory of the Factory Preset.)
1. Turn OFF the power.
2. While pressing 3 and AUTO-BETICAL SELECT together, turn ON POWER .
2. While pressing 3 and AUTO-BETICAL SELECT together, turn ON POWER .
4. Forced RESET (Used to delete the contents of Factory Preset when it is written into the preset memory.)
Clears all the RAMs and sets the initial state
1. Turn OFF the power.
2. While pressing 5 and AUTO-BETICAL SELECT together, turn ON POWER .
3. When “All clear” is indicated on the fluorescent display tube, it means that “Forced Reset” has been completed.
1. Turn OFF the power.
2. While pressing 5 and AUTO-BETICAL SELECT together, turn ON POWER .
3. When “All clear” is indicated on the fluorescent display tube, it means that “Forced Reset” has been completed.
5. Language Change
1. Turn OFF the power.
2. While pressing 2, turn ON POWER .
2. While pressing 2, turn ON POWER .
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)
Click on the first or last page to see other ST-SE570 service manuals if exist.