Sony STJX-661, STSE-200 Service manual

ST-JX661/SE200

SERVICE MANUAL

Photo : ST-JX661

SPECIFICATIONS

FM tuner section

Frequency range 87.5–108 MHz Antenna terminals 75 ohms, unbalanced Intermediate frequency 10.7 MHz Sensitivity at 50 dB quieting (mono) 22.1 dBf, 7µV/75Ω

(stereo) 42.1dBf, 7µV/75Ω

Usable sensitivity (IHF) 19.5 dBf, 5µV/75Ω

at 75 kHz deviation S/N 80 dB (mono), 75 dB (stereo) Harmonic distortion at 1 kHz

0.3% (mono), 0.5% (stereo)

Frequency response 30 Hz–15 kHz

(+0.5/–2.0 dB) Separation 35 dB at 1 kHz Selectivity 55 dB at 400 kHz Output at 75 kHz deviation

775 mV, 4.7 kilohms

AM tuner section

Frequency range US, Canadian model :

531–1,710 kHz (9 kHz)

530–1,710 kHz (10 kHz)

AEP, UK, German, Italian model :

522–1,611 kHz (9 kHz)

E, Singapore, Australian, Chinese, Malaysia,

Saudi Arabia model :

531–1,602 kHz (9 kHz)

530–1,710k Hz (10 kHz) Intermediate frequency 450 kHz Usable sensitivity (with AM loop antenna) AM : 500µV/m Signal-to-noise ratio 54 dB (500mV/m, 999 kHz) Harmonic distortion 0.5 % (50 mV/m, 400Hz) Selectivity 50 dB

US Model

Canadian Model

ST-JX661

AEP Model

UK Model

E Model

Austr alian Model

ST-JX661/SE200

Chinese Model

ST-SE200

General

Power requirements US, Canadian model :

120 V AC, 60 Hz AEP, German, Italian model : 220-230 V AC, 50/60Hz UK, Australian model : 240 V AC, 50/60Hz E, Singapore, Chinese, Malaysia, Saudi Arabia model : 110-120 V/220-240 V AC,

50/60 Hz adjustable Power consumption 7 W Dimensions 430 x 82 x 279 mm (w/h/d) (17 x

31/4 x 11 inches) Mass Approx. 2.4 kg (5 lb 4 oz) Supplied accessorise Audio cord (1)

AM loop antenna (1)

FM wire antenna (1)

Design and specifications are subject to change without notice.

MICROFILM

FM STREO/FM-AM TUNER

TABLE OF CONTENTS

Section Title Page

Specifications ................................................................................1

1. GENERAL

Location of Controls ...............................................................3

2. ADJUSTMENTS ...............................................................4

3. EXPLANATION OF IC TERMINALS..........................5

4. DIAGRAMS

4-1. Circuit Boards Location...................................................7

4-2. Printed Wiring Boards......................................................8

4-3. Schematic Diagram........................................................ 11

5. EXPLODED VIEW

5-1. Front Section..................................................................15

6. ELECTRICAL PARTS LIST ........................................17

MODEL IDENTIFICATION

– Model Number Label –

MODEL NO.

FM STEREO/FM-AM TUNER

ST-JX661 ST-SE200

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety check before releasing the set to the customer : Check the antenna terminals, metal trim, "metallized" knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5mA (500 microampers). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a V OM

or battery-operated A C voltmeter . The “limit” indication is 0.75V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

US, Canadian model : AC 120⁄60Hz

UK, Australian model : AC 240⁄50Hz

AEP, German, Italian model : AC 220–230V⁄50Hz

E, Singapore, Chinese,

Malaysia, Saudi Arabia model : AC 110–120 V/220–240 V

⁄50/60 Hz

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.

0.15 F

1.5k

Ω

Voltmeter (0.75V)

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

ATTENTION AU COMPOSANT AYANT RAPPORT

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

À LA SÉCURITÉ!

– 2 –

LOCATION OF CONTROLS

SECTION 1

GENERAL

1 POWER button 2 MEMORY SCAN button 3 STEREO/MONO button 4 Display window 8 BAND button

5 Numeric buttons 6 TUNING buttons 7 MEMORY button

– 3 –

)

SECTION 2

ADJUSTMENTS

TUNER SECTION

Note 1 : The adjustment should be performed in the publication.

(AM n FM)

Note 2 : As a front-end (FE1) is difficult to repair if faulty, replace

it with new one.

AM Section Adjustment

Setting :

loop antenna A

AM RF signal generator

Carrier frequency : 1,050kHz (US, Canadian) 999kHz (EXCEPT US, Canadian) Modulation : 400Hz, 30% modulation

60cm

FM Section Adjustment

Setting :

FM RF signal generator

75Ω coaxial

FM ANTENNA terminal (TM1

Carrier frequency : 98MHz Modulation : 1kHz, 75kHz deviation

loop antenna B

set

FM Tuned Indication Lighting Level Adjustment

Band : FM

Procedure :

1. Supply a 31.6µV (30dBµ) 98 MHz signal to the ANTENNA ter-

minal (TM1).

2. Tune the set to 98MHz.

3. Adjust RV42 so that the TUNED light up.

4. Confirm that the TUNED light off with FM RF signal generator

output level set at 25.1µV (28dBµ).

Adjustment Location : TUNER board

[ TUNER BOARD ] – Component side –

RV42 : FM Tuned Leve

RV41 : AM Tuned Level

AM Tuned Indication Lighting Level Adjustment

Band : AM

Procedure :

1. Set loop antenna A so that the loop antenna B input le vel becomes

316.2µV (50dBµ)

2. Tune the set to 1,050kHz (US, Canadian) or 999kHz (EXCEPT US, Canadian).

3. Adjust RV41 so that the TUNED light up.

4. Confirm that the TUNED light off with AM RF signal generator output level set at 251.2µV (48dBµ)

5. Confirm the FM tuned indication lighting level and adjust if necessary.

Adjustment Location : TUNER board

– 4 –

SECTION 3

EXPLANATION OF IC TERMINAL

IC701 µPD78042AGF-078-3B9 (FL DRIVER)

Pin No. Pin name I/O Description

1G7 O 2G6 O 3G5 O 4 G4 O FL drive. 5G3 O 6G2 O 7G1 O 8 VDD – Power supply (+5V)

9 PLL CE O Chip enable output to PLL IC. 10 PLL DATA OUT O PLL data output. 11 PLL CLK I PLL clock input. 12 PLL DATA IN I PLL data input. 13 AST I Tuned signal input. 14 ST I Stereo signal input. 15 NC – Not used. (Ground) 16 NC – Not used. (Ground) 17 RESET I System reset input. 18 DC CUT – Not used. (Open) 19 NC – Not used. (Open) 20 A VSS (GND) – Ground. 21 MUTE O Line mute output. 22 NC – Not used. (Open) 23 NC – Not used. (Open) 24 NC – Not used. (Open) 25 MODEL – Not used. (Ground) 26 KEY 3 I Key input. 27 KEY 2 I Key input. 28 KEY 1 I Key input. 29 AVDD – Power supply (+5V) 30 AVREF – Analog voltage reference. 31 GND – Ground. 32 NC – Not used. (Open) 33 GND – Ground. 34 X1 I System clock. (5MHz) 35 X2 O System clock. (5MHz) 36 NC – Not used. (Open) 37 POWER SW I Power switch input. 38 NC – Not used. (Ground) 39 NC – Not used. (Ground) 40 NC – Not used. (Ground)

– 5 –

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