Sony ST-SE520 User manual

1
AEP Model
UK Model
SPECIFICATIONS
SERVICE MANUAL
FM STEREO FM-AM TUNER
ST-SE520
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Front Panel Descriptions
SECTION 1
GENERAL
1!(Power)switch
2EON TA button
3EON NEWS/INFO button
4PTY button
5DISPLAY button
6Display window
7CHARACTER button
8TUNE MODE button
9TUNING/SELECT knob
10 ENTER button
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 PUBLISHED BY SONY.
TABLE OF CONTENTS
1. GENERAL .......................................................................... 2
2.TEST MODE ....................................................................... 3
3. ELECTRICAL ADJUSTMENTS ................................. 5
4. DIAGRAMS
4-1. Circuit Boards Location ........................................................ 5
4-2. Schematic Diagram – Tuner Section – ................................. 6
4-3. Printed Wiring Board – Tuner Section – ............................... 7
4-4. Schematic Diagram – Display Section – .............................. 8
4-5. Printed Wiring Board – Display Section –............................ 9
4-6. IC Pin Function ................................................................... 10
4-7. IC Block Diagrams.............................................................. 11
5. EXPLODEDVIEW ......................................................... 12
6. ELECTRICAL PARTS LIST ........................................ 13
9
7823 4 651 10
11 13
12 14 15 16 17 18 19
11 AUTO-BETICAL SELECT button
12 MEMORY button
13 FM MODE button
14 BAND button
15 SHIFT button
16 Numeric buttons
17 DIRECT button
18 MENU button
19 RETURN button
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SECTION 2
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 !.
• 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
IC802 NG
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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 !.
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.
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 !.
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 !.
3. When “All clear” is indicated on the fluorescent display tube, it means that “Forced Reset” has been completed.
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
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5
SECTION 4
DIAGRAMS
4-1. CIRCUIT BOARDS LOCATION
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this,the necessary note is printed
in each block.)
For schematic diagrams.
Note:
• 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.
•2: nonflammable resistor.
•C: panel designation.
For printed wiring boards.
Note:
•X: parts extracted from the component side.
•x: parts mounted on the conductor side.
•b: Pattern from the side which enables seeing.
•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.
WAVEFORMS
1
IC802 qf
Note: The components identified by mark 0or dotted line
with mark 0are critical for safety.
Replace only with part number specified. • Indication of transistor
• VoltagesaretakenwithaVOM(Inputimpedance10 MΩ).
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
SECTION 3
ELECTRICAL ADJUSTMENTS
FM Signal Level Adjustment Adjustment Location:
[TUNER BOARD] — Component Side —
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.
2
IC701 qs
FM RF signal
generator
set
FM ANTENNA
75 Ωcoaxial
(TB101)
Carrier frequency : 98 MHz
Modulation : 1 kHz, 40 kHz deviation
Output level : 6.3 mV (76dBµ)
(75 Ωopen)
IC201
RV201
FM SIGNAL LEVEL
AC SW board
ENCODER board
TRANSFORMER board
DISPLAY board
TUNER board
CThese are omitted EB
4.8Vp-p
4.332MHz
4.3Vp-p
4.19MHz
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6
ST-SE520
4-2. SCHEMATIC DIAGRAM –TUNER SECTION –
•See page 5 for Waveform.
•See page 11 for IC Block Diagram.
(Page 8) (Page 8)
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ST-SE520
4-3. PRINTED WIRING BOARD –TUNER SECTION –
•See page 5 for Circuit Boards Location.
Ref.No. Location
•Semiconductor Location
D201 A-5
D901 B-5
D902 B-5
D903 C-5
D904 C-5
D905 C-4
D906 D-5
D907 C-3
D908 C-3
IC201 B-1
IC302 A-4
IC802 D-3
IC901 C-3
Q301 A-3
Q302 A-2
Q303 A-3
Q304 A-3
Q702 D-1
Q901 C-2
Ref.No. Location
(Page 9)
(Page 9)
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8
ST-SE520
4-4. SCHEMATIC DIAGRAM –DISPLAY SECTION –
•See page 5 forWaveform.
•See page 10 for IC Pin function.
(Page 6) (Page 6)
PIN
FUNCTION
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9
ST-SE520
4-5. PRINTEDWIRING BOARD – DISPLAY SECTION –
• See page 5 for Circuit Boards Location.
(Page 7) (Page 7)
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4-6. IC PIN FUNCTION
•IC701 System Control (µPD78205GF-040-3BA)
I/O Function
Pin Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
—
—
—
—
—
—
—
—
—
I
O
I
—
—
I
—
O
O
I
O
—
I
—
I
—
O
O
—
I
O
I
I
I
—
I
I
I
I
I
—
Power supply (+5V)
Not used
Not used
Not used
Not used
Not used
Not used
Not used
Not used
System reset input
Oscillation signal output (4.19MHz)
Oscillation signal output (4.19MHz)
Ground
Not used
Lock signal input
Power supply (+5V)
PLL clock to TB101
PLL data to TB101
PLL clock from TB101
PLL Latch to TB101
Not used.
Stereo display detection.
Not used
Auto stop signal detection
Ground
Muting signal output
External control
Not used
RDS data input
Rotary encoder phase detection
Key input
Key input
Signal input
Analog power supply (+5V)
Reference voltage (+5V)
Remote control input
Rotary encoder number of rotation detection
RDS data clock input
Power supply ON/OFF monitor
Ground
VDD
ANT
ANT
BAND 1
BAND 2
IF-B
NC
MONO
TUN
RESET
X2
4.19MHz
GND
NC
LOCK
VDD
CLK
DATA
D-IN
CE
BLN
ST
CAL
AST
AVSS
MUTE
E ON
PGM
DATA RDS
R2
KEY 2
KEY 1
SI
AVDD
AVREF
R IN
R 1
RDS CLK
POWER
GND
I/O Function
Pin No. Pin Name
41
42
43
44
45
46
47 to 78
79
80 to 84
85
86 to 100
IS 5
IS 4
IS 3
IS 2
IS 1
VDD
P1 to P32
V LOAD
P33 to P37
G16
G15 to G1
I
I
I
I
I
—
O
—
O
—
O
Model detection
Power supply (+5V)
FL segment output
Power supply (–30V)
FL segment output
Not used
FL grid output
•Abbreviation
FL: FLUORESCENT INDICATOR TUBE
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