SONY STRWX7 - Service Manual Immediate Download

STR-WX7

E Model

Australian Model

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

MICROFILM

SPECIFICATIONS

STR-WX7 is the tuner and amplifier

section in MHC-WX7AV.

Amplifier section

The following measured at AC 120, 220, 240 V 50/60 Hz

DIN power output (Rated) (FRONT)

120 + 120W (6

at 1kHz DIN)

Continuous RMS power output (Reference)

FRONT SPEAKER: 150 + 150W

at 1kHz, 10% THD)

CENTER SPEAKER: 60W

at 1kHz, 10% THD)

REAR SPEAKER: 40 + 40W

at 1kHz, 10% THD)

Inputs

MD/VIDEO 1 IN (phono jacks): voltage

450/250mV, impedance 47k

AV INPUT AUDIO (phono jacks):

voltage 250mV, impedance 47k

MIX MIC (phone jack): sensitivity 1mV,

impedance 10k

Output

MD/VIDEO 1 OUT (phono jacks):

voltage 450/250mV, impedance 1k

PHONES (stereo phone jack): accepts

headphones of 8

or more.

FRONT SPEAKER:

accepts impedance of 6 to 16

CENTER SPEAKER:

accepts impedance of 8 to 16

REAR SPEAKER:

accepts impedance of 8 to 16

SUPER WOOFER:

Voltage 1V, impedance 1k

Video section

Inputs

AV INPUT VIDEO (phone jack): 1Vp-p,

Outputs

MONITOR OUT (phone jack): 1Vp-p,

5Tuner section

FM stereo, FM/AM superheterodyne tuner

FM tuner section

Tuning range

87.5 108.0MHz

Antenna terminals

unbalanced

Intermediate frequency

10.7MHz

AM tuner section

Tuning range

Middle Easten models:

531 1,602kHz(with the MW interval set at

9kHz)

5.95 17.90MHz (with the SW interval set

at 5kHz)

Australian, Thai models : 531 1,602kHz(with the AM tuning

interval set at 9kHz)

530 1,710kHz (with the AM tuning

interval set at 10kHz)

Other models:

MW :

531 1,602kHz(with the MW tuning

interval set at 9kHz)

530 1,710kHz (with the MW tuning

interval set at 10kHz)

SW :

5.95 17.90 MHz (with the SW tuning

interval set at 5kHz)

Intermediate frequency

450kHz

Antenna

AM loop antenna

External antenna terminal

-- Continued on next page --

TABLE OF CONTENTS

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

2. DISASSEMBLY

2-1.

Slideng Panel Assembly ····················································· 4

2-2.

Level Slider ········································································ 4

3. SERVICE MODE .............................................................. 5

4. DIAGRAMS

4-1.

Circuit Boards Location ·················································· 9

4-2.

Block Diagrams

· Main Section ································································ 10

· Power Section ······························································ 11

4-3.

Printed Wiring Board

Main Section ························· 12

4-4.

Schematic Diagram

Main (1/2) Section ···················· 13

4-5.

Schematic Diagram Main (2/2) Section ························· 14

4-6.

Schematic Diagram AV/Mic Section ······························ 15

4-7.

Printed Wiring Board AV/Mic Section ··························· 15

4-8.

Schematic Diagram Power Amp Section ······················· 16

4-9.

Printed Wiring Board Power Amp Section ····················· 17

4-10. Schematic Diagram Display Section ······························ 18

4-11. Printed Wiring Board Display Section ··························· 19

4-12. Schematic Diagram Sliding Panel Section ····················· 20

4-13. Printed Wiring Board Sliding Panel Section ·················· 21

4-14. Schematic Diagram Surround Section ··························· 22

4-15. Printed Wiring Board Surround Section ························· 23

4-16. Printed Wiring Board Trans Section ······························· 24

4-17. Schematic Diagram Trans Section ································· 25

4-18. IC Block Diagrams ··························································· 26

4-19. IC Pin Function ································································ 28

5. EXPLODED VIEWS

6-1.

Case and Sliding Panel Section ........................................ 31

6-2.

Front Panel Section .......................................................... 32

6-3.

Slide Mechanism Section ................................................. 33

6-4.

Circuit Boards and Back Panel Section ............................ 34

7. ELECTRICAL PARTS LIST ........................................ 35

LABEL MODEL NUMBER

No.

MODEL IDENTIFICATION

-- BACK PANEL --

Saudi Arabia, Singapore,

Malaysia, Australian model

4-900-848-2

Thai model

4-900-848-3

MODEL

PART No.

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.

General

Power requirements

Australian model:

240V AC, 50/60Hz

Thailand model:

220V AC, 50/60Hz

Other models:

120V or 220V or 230 240, 50/60Hz

Adjustable with voltage selector

Power consumption

340W

Dimensions (w/h/d)

Approx. 288

× 205 × 375mm

Mass

Approx. 8.8kg

Design and specifications are subject to change without notice.

Front Panel

SECTION 1

GENERAL

1 2 3 4 5 6

!º

!¡

!TM

!£

!¢

!¶!§

@§

@¶

@·

@ª

#£

#¢

#º

!·

!ª

@¡

@£

@¢

@º

#¡

#TM

@TM

Rear Panel

1 MOVIE button

2 MUSIC button

3 GAME button

4 PLACE button

5 P FILE button

6 EFFECT ON/OFF button

7 OPEN/CLOSE button

8 TUNER BAND button

9 STEREO/MONO button

!º TUNING MEMORY button

!¡ KARAOKE PON/MPX button

!TM MIC LEVEL dial

!£ MIX MIC jack

!¢ GROOVE button

! VOLUME dial

!§ ) + button

!¶ ENTER/NEXT button

!· MULTI JOG STATION dial

!ª 0 button

@º NON-STOP button

@¡ EDIT button

@TM FLASH button

@£ PLAY MODE button

@¢ REPEAT button

@ PHONES jack

@§ LOOP button

@¶ CLOCK/TIMER SET button

@· TIMER SELECT button

@ª FUNCTION button

#º PROLOGIC button

#¡ DSP button

#TM DBFB button

#£ DISPLAY/DEMO button

#¢ I/u (POWER) button

1 SYSTEM CONTROL jack

2 ANTENNA terminal

3 CENTER SPEAKER terminal

4 REAR SPEAKER terminal

5 MONITOR OUT jack

6 FRONT SPEAKER terminal

7 MD/VIDEO 1 jack

SECTION 2

DISASSEMBLY

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

2-1. SLIDING PANEL ASSEMBLY

4 Flat type cable (19 core)

2 Screw (BVTP 3x8)

3 Holder level

5 Sliding panel assembly

Slide mechanism

1 Push the OPEN/CLOSE button to

open the Sliding panel assembly.

1 Screw (BVTP2.6x8)

4 Four screw

(BVTP2.6x8)

5 Holder (L) assembly

6 Four screw (BVTP2.6x8)

7 Holder (R) assembly

8 Remove the Level slider direction of arrow.

2 Screw

(BVTP2.6x8)

3 Top bracket

2-2. LEVEL SLIDER

NOTE FOR INSTALLATION :

Attach in the reverse order, but make sure the rollers (

a, b) of the

holder (L) assembly and holder (R) assembly fit into the grooves of

the level slider.

SECTION 3

SERVICE MODE

Connections and Operations When Used Alone

Normally, use the unit connected to the HTC-WX5 as follows.

Basically, when servicing the unit, connect the unit as follows.

Even when not connected to the HTC-WX5, the unit can operate alone as it mounts a power supply (some functions will however not be

available).

MC Cold Reset

· The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to the

customer.

Procedure:

Press three buttons EDIT , ENTER/NEXT , and DISPLAY/DEMO simultaneously.

The fluorescent indicator tube becomes blink instantaneously, and the set is reset.

CD Delivery Mode (This mode can be used only when the HTC-WX5 is connected.)

· This mode moves the pick-up to the position durable to vibration. Use this mode when returning the set to the customer after repair.

Procedure:

Press

1/u button to turn the set ON.

Press LOOP button and

1/u button simultaneously.

A message "LOCK" is displayed on the fluorescent indicator tube, and the CD delivery mode is set.

MC Hot Reset

· This mode resets the set with the preset data kept stored in the memory. The hot reset mode functions same as if the power cord is plugged

in and out.

Procedure:

Press three buttons REPEAT , ENTER/NEXT , and DISPLAY/DEMO simultaneously.

The fluorescent indicator tube becomes blink instantaneously, and the set is reset.

Sled Servo Mode (This mode can be used only when the HTC-WX5 is connected.)

· This mode can run the CD sled motor freely. Use this mode, for instance, when cleaning the pick-up.

Procedure:

Select the function "CD".

Press three buttons FLASH , ENTER/NEXT , and KARAOKE PON/MIX simultaneously.

The Sled Servo mode is selected, if "CD" is blinking on the fluorescent indicator tube.

With the CD in stop status, press

) + button move the pick-up to outside track, or 0 button to inside track.

To exit from this mode, perform as follows:

1) Move the pick-up to the most inside track.

2) Press three buttons in the same manner as step 2.

Note:

· Always move the pick-up to most inside track when exiting from this mode. Otherwise, a disc will not be unloaded.

· Do not run the sled motor excessively, otherwise the gear can be chipped.

Change-over of FUNCTION Name

· The FUNCTION name of external input terminal can be changed over to VIDEO 1 or MD. With the FUNCTION selected to "MD", about

5dB mute is applied to the input gain.

Procedure:

Press

1/u button to turn the set OFF.

Press

1/u button together with FUNCTION button, and the power is turned on, the display of fluorescent indicator tube changes to

"MD" or "VIDEO 1" instantaneously, and thus the FUNCTION is changed over.

Change-over of AM Tuner Step between 9kHz and 10kHz

· A step of AM channels can be changed over between 9kHz and 10kHz.

Procedure:

Press

1/u button to turn the set ON.

Select the function "TUNER", and press TUNER BAND button to select the BAND "MW".

Press

1/u button to turn the set OFF.

Press ENTER/NEXT and

1/u buttons simultaneously, and the display of fluorescent indicator tube changes to "MW step 10" or

"MW step 9", and thus the channel step is changed over.

AC IN

UNIT

HTC-WX5

SYSTEM CONTROL 17P