Sony STSE-520 Service manual
ST-SE520
SERVICE MANUAL
SPECIFICATIONS
AEP Model
UK Model
FM STEREO FM-AM TUNER
1
TABLE OF CONTENTS
SAFETY-RELATED COMPONENT WARNING !!
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. EXPLODED VIEW ......................................................... 12
6. ELECTRICAL PARTS LIST ........................................ 13
SECTION 1
GENERAL
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE
WITH MARK 0 ON 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.
Front Panel Descriptions
11
1 ! (Power)switch
2 EON TA button
3 EON NEWS/INFO button
4 PTY button
5 DISPLAY button
6 Display window
7 CHARACTER button
8 TUNE MODE button
9 TUNING/SELECT knob
10 ENTER button
7
131214 15 16 17 18
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
9
823 4 651 10
19
2
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, L W). Set to a desir ed band before setting the test
mode.
1. Turn OFF the power.
2. While pressing 4 and AUTO-BETICAL SELECT together, turn ON ! .
• The items in the following table will be checked automatically in order every 2 seconds.
Display Items
Tuned
IF Frq
Sig Level
Stereo
RDS Signal
AST signal =LOW
IF COUNT OK
SI LEVELh70dB
ST signal=LOW
RDS DATA OK
FM RDS
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
DISPLAY
AM (MW, LW)
OK or NG
OK or NG
NG
IC201 NG, RV201 adjustments
TB101, IC201 NG
TB101 NG
TB101 NG
IC802 NG
3
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. Display Tube Check and KEY Check mode
1. Turn OFF the power.
2. While pressing 1 and AUTO-BETICAL SELECT together, turn ON ! .
3. While continuously pressing 1 and AUTO-BETICAL SELECT together, check the following.
Microcomputer version indication (1 sec) t All light up “7F” t Dot area only “60” t Dot area only “7E”
Indication test pattern
1 7F
The display changes every 1 sec.
4. Release 1 and 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.
2 60 3 7E
T
Dot area only “5F” T Dot area only “3D”
4 3D
5 5F
T
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 3 and 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 5 and 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.
4
SECTION 3
AC SW board
ENCODER board
TRANSFORMER board
DISPLAY board
TUNER board
4.3Vp-p
4.19MHz
ELECTRICAL ADJUSTMENTS
SECTION 4
DIAGRAMS
FM Signal Level Adjustment
FM RF signal
generator
set
Carrier frequency : 98 MHz
Modulation : 1 kHz, 40 kHz deviation
Output level : 6.3 mV (76dBµ)
(75 Ω open)
FM ANTENNA
75 Ω coaxial
(TB101)
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” indication lights on fluorescent indicator tube.
Adjustment Location:
[TUNER BOARD] — Component Side —
IC201
RV201
FM SIGNAL LEVEL
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 Ω and 1/
specified.
• 2 : nonflammable resistor.
• C : panel designation.
Note: The components identified by mark 0 or dotted line
with mark 0 are critical for safety.
Replace only with part number specified.
• 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.
∗
4
W or less unless otherwise
WAVEFORMS
• Voltages are taken with a V OM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F : FM
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.
• Indication of transistor
C
EB
These are omitted
1
4.8Vp-p
4.332MHz
IC802 qf
5
5
2
IC701 qs
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