Sony ST-SE570 Manual de usuario

SERVICE MANUAL

FM STEREO FM-AM TUNER

AEP Model

UK Model

SPECIFICATIONS

ST-SE570

Ver 1.0 2001.04

9-873-834-11 Sony Corporation

2001D0500-1 Home Audio Company

C2001.4 ShinagawaTec Service Manual Production Group

FM tunersection

Frequency range 87.5 - 108.0 MHz

(50 kHz step)

Aerial terminals 75 Ω, unbalanced

IEC-male

Intermediate frequency10.7 MHz

Sensitivity at 26 dB quieting (mono)

10.3 dBf, 0.9 µV/75 Ω

at 46 dB quieting (stereo)

38.5 dBf, 23 µV/75 Ω

Usable sensitivity (IHF)10.3 dBf, 0.9 µV/75Ω

S/N at 40 kHz deviation

74 dB (mono), 69 dB

(stereo)

Harmonic distortion 0.09% (mono),

0.18% (stereo)

Frequency response 30 Hz - 15 kHz

(+0.5/–1.0 dB)

Separation 45 dB at 1 kHz

Selectivity at 400 kHz

85 dB

at 300 kHz

70 dB

Output at 40 kHz deviation

600 mV

AM tuner section

Frequency range

MW: 522 - 1,611 kHz

(9 kHz step)

LW: 144 - 288 kHz

(1 kHz step)

Intermediate frequency450 kHz

Usable Sensitivity (with AM loop aerial)

MW: 200 µV/m

LW: 700 µV/m

Signal-to-noise ratio

MW: 54 dB

(50 mV/m, 999 kHz)

LW: 50 dB

(50 mV/m, 216 kHz)

Harmonic distortion 0.3% (50 mV/m,

400 Hz)

Selectivity 50 dB

General

Power requirements 230 V AC, 50/60 Hz

Power consumption 10 W

Dimensions 430 x 83 x 290 mm

(w/h/d)

Weight 2.5 kg

Supplied accessories

Audio cord (1)

AM loop antenna (1)

FM wire antenna (1)

EON connecting cord (1)

Design and specifications are subject to change

without notice.

ST-SE570

TABLE OF CONTENTS

1. GENERAL ................................................................... 3

2. DISASSEMBLY

2-1. Disassembly Flow ........................................................... 4

2-2. Case (407026) ................................................................. 4

2-3. MAIN Board ................................................................... 5

3. TEST MODE.............................................................. 6

4. ELECTRICAL ADJUSTMENTS......................... 8

5. DIAGRAMS

5-1. Note for Printed Wiring Boards and

Schematic Diagrams ....................................................... 9

5-2. Printed Wiring Boards –MAIN Section –..................... 10

5-3. Schematic Diagram –MAIN Section –.......................... 11

5-4. Printed Wiring Boards –DISPLAY Section –............... 12

5-5. Schematic Diagram –DISPLAY Section –.................... 13

5-6. IC Pin Function Description ........................................... 14

6. EXPLODED VIEWS

6-1. Case Section .................................................................... 16

6-2. Front Panel Section ......................................................... 17

6-3. Chassis Section ............................................................... 18

7. ELECTRICAL PARTS LIST ............................... 19

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 PUB-

LISHED BY SONY.

ST-SE570

SECTION 1

GENERAL This section is extracted from

instruction manual.

LOCATION OF CONTROLS

– Front Panel –

AUTO BETICAL SELECT qk (7, 12)

BAND qg (9, 10, 12)

CHARACTER 7(11)

DIRECT qs (9)

DISPLAY 5(10, 11, 13)

ENTER qa (9, 11, 12, 14)

EON NEWS/INFO 3(13, 14)

EON TA 2(13, 14)

FM MODE qh (9, 10)

MEMORY 4(8, 11)

MENU 0(9, 11, 14)

Numeric buttons qf (7–9)

POWER 1(7, 8, 12)

PTY qj (14, 15)

RETURN 9(9)

SHIFT qd (8, 11)

TUNE MODE 8(8, 10)

TUNING/SELECT 6(7–12, 14)

1234567890

1 2 3 4 5 7 86

90qaqsqdqfqgqhqj

1FM ANTENNA terminal

2AM ANTENNA terminals

3LINE OUT jack

4EON CONTROL OUT terminal

– Rear Panel –

ANTENNA LINE OUT

EON CONTROL

75ΩCOAXIAL

RL OUT

134

ST-SE570

• This set can be disassembled in the order shown below.

2-1. DISASSEMBLY FLOW

SECTION 2

DISASSEMBLY

Note: Follow the disassembly procedure in the numerical order given.

2-2. CASE (407026)

(Page 4)

2-3. MAIN BOARD

(Page 5)

SET

two screws

(case 3 TP2)

two screws

(case 3 TP2

)

screw

(case 3 TP2)

case (407026)

ST-SE570

2-3. MAIN BOARD

MAIN board

connector (CNP701)

connector (CNP702)

connector (CNP952)

wire (flat type) (15 core

)

(CN101)

two screws

(BV/RING)

ST-SE570

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 POWER .

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.

SECTION 3

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 POWER .

• 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

IC801 NG

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

ST-SE570

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 POWER .

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 POWER .

3. When “All clear”is indicated on the fluorescent display tube, it means that “Forced Reset”has been completed.

5. Language Change

1. Turn OFF the power.

2. While pressing 2, turn ON POWER .

ST-SE570 SECTION 4

ELECTRICAL ADJUSTMENTS

FM Signal Level Adjustment

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.

Adjustment Location:

[MAIN BOARD] — Component Side —

FM RF signal

generator

set

FM ANTENNA

Ω

coaxial

(TB101)

Carrier frequency : 98 MHz

Modulation : 1 kHz, 40 kHz deviation

Output level : 6.3 mV (76dB

)

(75

Ω

open)

IC201

CN101

RV201

FM SIGNAL LEVEL

Adjustment

ST-SE570

SECTION 5

DIAGRAMS

5-1. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS

(In addition to this, the necessary note is printed in each block)

Note on Printed Wiring Board:

•X: parts extracted from the component side.

•: Pattern from the side which enables seeing.

• Indication of transistor.

These are omitted.

Note on Schematic Diagram:

•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.

•f: internal component.

•2: nonflammable resistor.

•C: panel designation.

•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.

•VoltagesaretakenwithaVOM(Inputimpedance10MΩ).

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

Note: The components identified by mark 0or dotted line

with mark 0are critical for safety.

Replace only with part number specified.

• Waveforms

– DISPLAY Board –

1IC701 qa (X2)

– MAIN Board –

2IC801 qf (OSCO)

4.3 Vp-p

238.6 ns

4.8 Vp-p

4.332 MHz

• Circuit Boards Location

MAIN board

TUNER (PACK)

TRANSFORMER board

AC SW board

DISPLAY board

ENCORDER board

SW board

ST-SE570

1010

L R

LINE OUT

169

(CHASSIS)

CNJ251

EON CONTROL

OUT

169

DISPLAY BOARD

CN702

DISPLAY BOARD

CN701

MAIN BOARD

75Ω

COAXIAL

TUNER PACK

SUPPLIED WITH

THE ASSEMBLED

BLOCK

ANTENNA

TB101

1-681-057-

(11)

TRANSFORMER BOARD

AC SW BOARD

POWER

1-681-061-

(11)

NOT REPLACEABLE :

BUILT IN TRANSFORMER

POWER TRANSFORMER

1PC901

AC IN

BRN

BLU

1-681-062-

(11) 1

1 2 3 4 5 6 7 8 9 10

5-2. PRINTED WIRING BOARDS – MAIN Section – • See page 9 for Circuit Boards Location.

IC301 E-6

IC801 B-7

IC901 D-7

Q301 E-8

Q302 E-8

Q303 E-7

Q304 E-7

Q801 C-8

Q901 C-8

Ref. No. LocationRef. No. Location

D251 E-5

D901 E-5

D902 D-5

D903 C-5

D904 C-5

D905 C-6

D906 B-5

D907 C-7

D908 C-7

IC201 E-9

• Semiconductor Location

(Page 12) (Page 12)

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