Read Sony ST-SE520 Service Manual online
1
AEP Model
UK Model
SPECIFICATIONS
SERVICE MANUAL
FM STEREO FM-AM TUNER
ST-SE520
2
Front Panel Descriptions
SECTION 1
GENERAL
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
SAFETY-RELATED COMPONENT WARNING !!
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.
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
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
9
7
8
2
3
4
6
5
1
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
3
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.
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 4 and AUTO-BETICAL SELECT together, turn ON ! .
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.
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
4
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.
2. While pressing 1 and AUTO-BETICAL SELECT together, turn ON ! .
3. While continuously pressing 1 and AUTO-BETICAL SELECT together, check the following.
Indication test pattern
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.
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 ! .
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.
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.
Microcomputer version indication (1 sec)
t All light up “7F” t Dot area only “60” t Dot area only “7E”
Dot area only “5F”
T Dot area only “3D”
T
T
1
7F
2
60
3
7E
4
3D
5
5F
