Sony ST-SE520 Manual de usuario

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

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

AM (MW, LW)

OK or NG

IC201 NG, RV201 adjustments

TB101, IC201 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”

17F 260 37E 43D 55F

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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

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.

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

4.8Vp-p

4.332MHz

4.3Vp-p

4.19MHz

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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)

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ST-SE520

4-4. SCHEMATIC DIAGRAM –DISPLAY SECTION –

•See page 5 forWaveform.

•See page 10 for IC Pin function.

(Page 6) (Page 6)

FUNCTION

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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

—

Power supply (+5V)

Not used

System reset input

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

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

BAND 1

BAND 2

IF-B

MONO

TUN

RESET

4.19MHz

GND

LOCK

VDD

CLK

DATA

D-IN

BLN

CAL

AST

AVSS

MUTE

E ON

PGM

DATA RDS

KEY 2

KEY 1

AVDD

AVREF

R IN

R 1

RDS CLK

POWER

GND

I/O Function

Pin No. Pin Name

47 to 78

80 to 84

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

—

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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