Sony ST-SE570 User manual

SERVICE MANUAL
FM STEREO FM-AM TUNER
AEP Model
UK Model
SPECIFICATIONS
ST-SE570
Ver 1.0 2001.04
9-873-834-11 Sony Corporation
2001D0500-1 Home Audio Company
C2001.4 ShinagawaTec Service Manual Production Group
FM tunersection
Frequency range 87.5 - 108.0 MHz
(50 kHz step)
Aerial terminals 75 Ω, unbalanced
IEC-male
Intermediate frequency10.7 MHz
Sensitivity at 26 dB quieting (mono)
10.3 dBf, 0.9 µV/75 Ω
at 46 dB quieting (stereo)
38.5 dBf, 23 µV/75 Ω
Usable sensitivity (IHF)10.3 dBf, 0.9 µV/75Ω
S/N at 40 kHz deviation
74 dB (mono), 69 dB
(stereo)
Harmonic distortion 0.09% (mono),
0.18% (stereo)
Frequency response 30 Hz - 15 kHz
(+0.5/–1.0 dB)
Separation 45 dB at 1 kHz
Selectivity at 400 kHz
85 dB
at 300 kHz
70 dB
Output at 40 kHz deviation
600 mV
AM tuner section
Frequency range
MW: 522 - 1,611 kHz
(9 kHz step)
LW: 144 - 288 kHz
(1 kHz step)
Intermediate frequency450 kHz
Usable Sensitivity (with AM loop aerial)
MW: 200 µV/m
LW: 700 µV/m
Signal-to-noise ratio
MW: 54 dB
(50 mV/m, 999 kHz)
LW: 50 dB
(50 mV/m, 216 kHz)
Harmonic distortion 0.3% (50 mV/m,
400 Hz)
Selectivity 50 dB
General
Power requirements 230 V AC, 50/60 Hz
Power consumption 10 W
Dimensions 430 x 83 x 290 mm
(w/h/d)
Weight 2.5 kg
Supplied accessories
Audio cord (1)
AM loop antenna (1)
FM wire antenna (1)
EON connecting cord (1)
Design and specifications are subject to change
without notice.

2
ST-SE570
TABLE OF CONTENTS
1. GENERAL ................................................................... 3
2. DISASSEMBLY
2-1. Disassembly Flow ........................................................... 4
2-2. Case (407026) ................................................................. 4
2-3. MAIN Board ................................................................... 5
3. TEST MODE.............................................................. 6
4. ELECTRICAL ADJUSTMENTS......................... 8
5. DIAGRAMS
5-1. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 9
5-2. Printed Wiring Boards –MAIN Section –..................... 10
5-3. Schematic Diagram –MAIN Section –.......................... 11
5-4. Printed Wiring Boards –DISPLAY Section –............... 12
5-5. Schematic Diagram –DISPLAY Section –.................... 13
5-6. IC Pin Function Description ........................................... 14
6. EXPLODED VIEWS
6-1. Case Section .................................................................... 16
6-2. Front Panel Section ......................................................... 17
6-3. Chassis Section ............................................................... 18
7. ELECTRICAL PARTS LIST ............................... 19
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.

3
ST-SE570
SECTION 1
GENERAL This section is extracted from
instruction manual.
LOCATION OF CONTROLS
– Front Panel –
AUTO BETICAL SELECT qk (7, 12)
BAND qg (9, 10, 12)
CHARACTER 7(11)
DIRECT qs (9)
DISPLAY 5(10, 11, 13)
ENTER qa (9, 11, 12, 14)
EON NEWS/INFO 3(13, 14)
EON TA 2(13, 14)
FM MODE qh (9, 10)
MEMORY 4(8, 11)
MENU 0(9, 11, 14)
Numeric buttons qf (7–9)
POWER 1(7, 8, 12)
PTY qj (14, 15)
RETURN 9(9)
SHIFT qd (8, 11)
TUNE MODE 8(8, 10)
TUNING/SELECT 6(7–12, 14)
1234567890
1 2 3 4 5 7 86
90qaqsqdqfqgqhqj
qk
1FM ANTENNA terminal
2AM ANTENNA terminals
3LINE OUT jack
4EON CONTROL OUT terminal
– Rear Panel –
ANTENNA LINE OUT
EON CONTROL
FM
U
75ΩCOAXIAL
RL OUT
AM
2
134

ST-SE570
4
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SECTION 2
DISASSEMBLY
Note: Follow the disassembly procedure in the numerical order given.
2-2. CASE (407026)
2-2. CASE (407026)
(Page 4)
2-3. MAIN BOARD
(Page 5)
SET
1 two screws
(case 3 TP2)
2 two screws
(case 3 TP2
)
3 screw
(case 3 TP2)
4 case (407026)

ST-SE570
5
2-3. MAIN BOARD
4 MAIN board
2 connector (CNP701)
2 connector (CNP702)
2 connector (CNP952)
1 wire (flat type) (15 core
)
(CN101)
3 two screws
(BV/RING)

6
ST-SE570
NOTE : The preset data will be erased when this test mode is used.Therefore, take down the data before setting this mode and preset the data
again after completing operations in this mode.
2. DisplayTube Check and KEY Check mode
1. Turn OFF the power.
2. While pressing 1and AUTO-BETICAL SELECT together, turn ON POWER .
3. While continuously pressing 1and AUTO-BETICAL SELECT together, check the following.
Indication test pattern
The display changes every 1 sec.
4. Release 1and AUTO-BETICAL SELECT . The KEY CHECK mode will be set.
5. All key numbers will be displayed.
Key Number : 25
6. Each time the key is pressed, the key number will be counted down.
Each key will be counted only once, at the first time.
7. When all keys have been pressed, the process will end.
NOTE : As contents of the Factory Preset will be written into memory after completing this check mode, delete contents of memory
according to 4. Forced RESET.
SECTION 3
TEST MODE
1. Circuit Check Mode
Set to the reception frequency that the circuit can STEREO RDS stations. (Set the input level to above 70 dB.)
This enables circuit check to be performed in any of the reception modes-FM,AM (MW, LW). Set to a desired band before setting the test
mode.
1. Turn OFF the power.
2. While pressing 4and AUTO-BETICAL SELECT together, turn ON POWER .
• The items in the following table will be checked automatically in order every 2 seconds.
FM RDS
Display Items
Tuned
IF Frq
Sig Level
Stereo
RDS Signal
AST signal =LOW
IF COUNT OK
SI LEVELh70dB
ST signal=LOW
RDS DATA OK
DISPLAY
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
AM (MW, LW)
OK or NG
OK or NG
NG
IC201 NG, RV201 adjustments
TB101, IC201 NG
TB101 NG
TB101 NG
IC801 NG
Microcomputer version indication (1 sec) tAll light up “7F” tDot area only “60” tDot area only “7E”
Dot area only “5F” TDot area only “3D”
T
T
17F 260 37E 43D 55F

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 3and 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 5and 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 .

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 M” indica-
tion lights on fluorescent indicator tube.
Adjustment Location:
[MAIN BOARD] — Component Side —
FM RF signal
generator
set
FM ANTENNA
75
Ω coaxial
(TB101)
Carrier frequency : 98 MHz
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
99
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.
CE
Q
Note on Schematic Diagram:
•All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
•All resistors are in Ωand 1/4W 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.
•VoltagesaretakenwithaVOM(Inputimpedance10MΩ).
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 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified.
• Waveforms
– DISPLAY Board –
1IC701 qa (X2)
– MAIN Board –
2IC801 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
1010
L R
LINE OUT
18
169
E
E
E
E
(CHASSIS)
13
CNJ251
EON CONTROL
OUT
1
4
8
5
17
E
E
18
169
98
A
DISPLAY BOARD
CN702
B
DISPLAY BOARD
CN701
MAIN BOARD
75Ω
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
1PC901
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. LocationRef. 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)