Sony ST-SE520 (serv.man2) Service Manual ▷ View online
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MICROFILM
East European Model
CIS Model
SPECIFICATIONS
SERVICE MANUAL
FM STEREO FM-AM TUNER
ST-SE520
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Front Panel Descriptions
SECTION 1
GENERAL
1
U (Power) switch
2
MEMORY button
3
DISPLAY button
4
Display window
5
MENU button
6
TUNER MODE button
7
TUNING/SELECT knob
8
ENTER button
9
FM MODE button
10
BAND button
11
SHIFT button
12
Numeric buttons
13
DIRECT button
14
RETURN button
SAFETY-RELATED COMPONENT WARNING !!
COMPONENTS IDENTIFIED BY MARK
!
OR DOTTED LINE
WITH MARK
!
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. Schematic Diagram – Tuner Section – .................................. 7
4-2. Printed Wiring Board – Tuner Section – ............................... 9
4-3. Schematic Diagram – Display Section – ............................ 11
4-4. Printed Wiring Board – Display Section – .......................... 13
4-5. IC Pin Function ................................................................... 15
4-6. IC Block Diagrams .............................................................. 17
4-2. Printed Wiring Board – Tuner Section – ............................... 9
4-3. Schematic Diagram – Display Section – ............................ 11
4-4. Printed Wiring Board – Display Section – .......................... 13
4-5. IC Pin Function ................................................................... 15
4-6. IC Block Diagrams .............................................................. 17
5. EXPLODED VIEW
......................................................... 18
6. ELECTRICAL PARTS LIST
........................................ 19
7
8
2
3
4
6
5
1
10
11
13
12
9
14
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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.
1. Display Tube and Key Check Mode
1-1. Display Tube Check
1-1. Display Tube Check
1-1-1. Turn OFF the power.
1-1-2. While pressing
1-1-2. While pressing
1 and MENU together, turn ON U .
1-1-3. While continuously pressing
1 and MENU together, check the following.
Microcomputer version indication (1 sec) n All light up(1) n 8-digit test pattern(2) n 2-digit test pattern (3)
(1) All light up
(2) 8-digit test pattern
(3) 2-digit test pattern
The display changes every 500 msec.
1-2. Key Check
1-2-1. Release
1 and MENU . The KEY CHECK mode will be set.
1-2-2. All key numbers will be displayed.
1-2-3. Each time the key is pressed, the key number will be counted down.
Each key will be counted only once, at the first time.
1-2-4. When all keys have been pressed, the process will end and the factory preset will be entered.
SECTION 2
TEST MODE
n
Key Number
20
MONO
TA
AUTO
STEREO
MONO
TUNED
TA
NEWS
INFO
AUTO
PRESET
MEMORY
MEMORY
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2. Entering the Factory Preset
To skip “1. Display Tube Key Check Mode”, and factory preset:
(1) Turn OFF the power.
(2) While pressing
(2) While pressing
3 and MENU together, turn ON U .
3. Circuit Check Mode
Set to the reception frequency that the circuit can receive (FM:STEREO stations). (Set the input level to above 70 dB.)
(1) Turn OFF the power.
(2) While pressing
(2) While pressing
4 and MENU together, turn ON U .
• The items in the following table will be checked automatically in order every 2 seconds.
AST signal =LOW
IF COUNT OK
SI LEVEL
70dB
ST signal=LOW
TUNED
IF
SIG L
ST
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
OK or NG
TB 101 NG
TB 101 NG
TB101 NG
4. Forced RESET
Clears all the RAMs and sets the initial state
(1) Turn OFF the power.
(2) While pressing
(1) Turn OFF the power.
(2) While pressing
5 and MENU together, turn ON U .
NOTE : This model have PILOT/POLAR switching function. (Normally, do not use.)
(1) Turn OFF the power.
(2) While pressing
(2) While pressing
2, turn ON U .
Switches between PILOT and POLARITY and display the state.
Switches between PILOT and POLARITY each time this mode is performed.
Return the original state after completing the process.
Switches between PILOT and POLARITY each time this mode is performed.
Return the original state after completing the process.
Display
Items
FM STEREO
AM
Display
NG
>
=
IC 201 NG
RV201 adjustments
