Sony WMGX-410 Service manual

WM-GX410

SERVICE MANUAL

Ver 1.0 2004. 03

Model Name Using Simillar Mechanism NEW Tape Transport Mechanism Type MT-WMGX410-175

SPECIFICATIONS

Canadian Model

AEP Model

E Model

Chinese Model

Tourist Model

Frequency range Area* FM (MHz) AM(kHz)

AEP, E, Chinese 7.5 - 108 531 - 1 602 Canada, Tourist 87.5 - 108 530 - 1 710

Frequency response Playback: 40 - 15 000 Hz

Recording: 100 - 8 000 Hz

Input Microphone (MIC) jack Output Headphones (i) jack

Load impedance 8 - 300 Ω

Power requirements 3 V DC: batteries R6 (size AA) x 2

External DC 3V power sources

Power output Speaker 500 mW + 500 mW

(JEITA*)

Dimensions (w/h/d) Approx. 112.0x 82.5 x 35.0 mm

(4 1/2 x 3 1/4 x 1 7/16 inches), excl. projecting parts and controls

Mass Approx. 200 g (7.1oz)

(main unit only)

Supplied accessories Stereo headphones or earphones (1)

Sony dry battery R6P(SR) (2) (“Sony World Model” only)

Design and specifications are subject to change without notice.

Battery life* (Approx. hours)

Sony alkaline LR6(SG)** Sony

R6P(SR)

(using headphones/earphones) playback 24 6 radio 48 15 mic recording 20 4.5 radio recording 12 3 (using the speakers) playback 10 2.5 radio 17.5 5 radio recording 6.5 1

*Measured value by the standard of JEIT A (Japan Electronics and

Information T echnology Industries Association). (Using a Sony HF series cassette tape)

** When using Sony LR6 (SG) alkaline dry batteries (producedin

Japan).

Note

The battery life may be shorter depending on the operating ondition, the surrounding temperature and battery type.

9-877-585-01

RADIO CASSETTE-CORDER

Sony Corporation

Personal Audio Company Published by Sony Engineering Corporation

WM-GX410

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270°C

during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

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

1. GENERAL

Location of Parts and Controls ........................................2

2. DISASSEMBLY

2-1. Disassembly Flow .................................................... 3

2-2. Cabinet (Center), cabinet Front Assy....................... 3

2-3. Main Board .............................................................. 4

2-4. Mechanism Deck (MT-WMFX410-175) ................. 4

2-5. Cassette Holder Sub Assy ........................................ 5

2-6. Sub Board................................................................. 5

2-7. Rec/PB/ Erase head (HRPE301), Belt (AR),

Capstan/Reel Motor (M601) ................................... 6

3. ADJUSTMENTS

3-1. Mechanical Adjustments.......................................... 7

3-2. Electrical Adjustments ............................................. 7

SECTION 1

GENERAL

Antenna

4. DIAGRAMS

4-1.IC Pin Function Descriptions .................................... 10

4-2. Block Diagrams –Tape Section– .............................. 11

4-3. Block Diagrams –Tuner Section– ............................ 12

4-4. Printed Wiring Board –Main Section (Side A)– ...... 13

Printed Wiring Board –Main Section (Side B)–.......14

4-5. Schematic Diagram –Main Section (1/2)–............... 15

4-6. Schematic Diagram –Main Section (2/2)–............... 16

4-7. Printed Wiring Board –Sub Section (Side A)–.........17

4-8. Printed Wiring Board –Sub Section (Side B)–......... 18

4-9. Schematic Diagram –Sub Section–.......................... 19

4-10.IC Block Diagrams..................................................20

5. EXPLODED VIEWS

5-1. Cabinet (Rear) Section ............................................. 22

5-2. Cassette Lid Section................................................. 23

5-3. Mechanism Section-1 (MT-WMGX410-175)..........24

5-4. Mechanism Section-2 (MT-WMGX410-175)..........25

6. ELECTRICAL PARTS LIST .................................. 26

This section is extracted from instruction manual.

FF/CUEREW/REVIEW

PLAY**

STOP

REC

HOLD

VOL*

REC TIME/PLAY MODE

MIC (PLUG IN POWER)**

Flat Mic

* There is a tactile dot beside VOL on the main unit to show the direction to turn

up the volume.

** The button or jack has a tactile dot.

DIR TUNING/ENTER PAUSE

TUNE MODE FM MODE•MONO/ST

FM MODE•LOCAL/DX SOUND BOOST

AVLS ISS

DC IN 3V

AM RADIO OFF

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

2-1. DISASSEMBLY FLOW

SET

WM-GX410

SECTION 2

DISASSEMBLY

2-2. CABINET (CENTER)

(Page 3)

2-3. MAIN BOARD

(Page 4)

2-5. CASSETTE HOLDER SUB ASSY

(Page 5)

2-4. MECHANISM DECK

(MT-WMFX410-175) (Page 4)

2-7. REC/PB/ERASE HEAD (HRPE301),

BELT (AR), CAPSTAN/REEL MOTOR (M601) (Page 6)

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

2-2. CABINET (CENTER), CABINET FRONT ASSY

2-2. CABINET FRONT ASSY

(Page 3)

2-6. SUB BOARD

(Page 5)

cabinet (center)

screw (M1.4 toothed lock)

SP401

fiexible board (CN301)

two claws

screw (M1.4)

two claws

screw (M1.4)

Note on installation

Align three switches and three knobs

four screws (tapping B2.0)

SP402

two screws

two claws

cabinet front assy

WM-GX410

)

2-3. MAIN BOARD

remove nine soldering

plate connector (L)

screw

cabinet (center)

joint cover

MAIN board

2-4. MECHANISM DECK (MT-WMFX410-175)

three screws (IB lock)

flexible board

(CN305)

two screws

two screws (M1.4 toothed lock)

hand strap

plate, connector (R

screw

mechanism deck (MT-WMGX410-175)

2-5. CASSETTE HOLDER SUB ASSY

remove from projection

cassette holder sub assy

remove from projectio

WM-GX410

projection

2-6. SUB BOARD

four screws

spring, torstion

cabinet (center)

projection

remove two soldering

sub board

Note on installation

Align five switches and five knobs

three claws

cabinet front ass

WM-GX410

2-7. REC/PB/ERASE HEAD (HRPE301), BELT (AR), CAPSTAN/REEL MOTOR (M601)

Attaching belt (AR)

belt (AR)

two screws (M1.4)

M601 (CAPSTAN/REEL motor)

HRPE301 (REC/PB/ERASE head)

SECTION 3

R607

R601

RV602: Tape Speed Adjustment (4.8cm/s)

RV601: Tape Speed Adjustment (2.4cm/s)

RV601

RV602

[MAIN BOARD] (SIDE B)

ADJUSTMENTS

WM-GX410

3-1. MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured alcohol-moistened

2. Demagnetize the record/playback/erase head with a head

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to

5. The adjustments should be performed with the rated power

6. Power supply voltage : 3V DC.

Torque Measurement

Forward/Reverse CQ-102C (20 to 40 g • cm)

Back Tension

Fast Forward

and Rewind

3-2. ELECTRICAL ADJUSTMENTS

Note:

1. Supplied voltage: 3 V (DC)

2. Switch and control position

PRECAUTION

swab :

record/playback/erase head pinch roller capstan rubber belts

demagnetizer.

the parts adjusted.

supply voltage unless otherwise noted.

Mode Torque Meter Meter Reading

1.97 to 3.92 mN • m

(0.28 to 0.55 oz• inch)

Forward

CQ-102C (0.5 to 5.0 g • cm)

Reverse

CQ-102RC (0.5 to 5.0 g • cm)

CQ-201B (50 g • cm)

0.05 to 0.49 mN • m

(0.007 to 0.07 oz• inch)

0.05 to 0.49 mN • m

(0.007 to 0.07 oz• inch)

more than 4.90 mN • m

(0.7 oz• inch)

VOLUME control : output level < > :AEP

FM -20dBm <-30dBm>

AM-30dBm <-40dBm> AVLS switch : NORM REC TIME/PLAY MODE switch : NORMAL ISS switch : 1

1. Set REC TIME switch (S706) to NORMAL (4.8cm/s).

2. Play back the center portion of tape in REVmode, adjust R V602 so that the reading on the frequency counter becomes 3,000 Hz.

3. Set REC TIME switch (S706) to DOUBLE (2.4cm/s).

4. Play back the center portion of tape in REVmode, adjust R V601 so that the reading on the frequency counter becomes 1,500 Hz.

Specifications: NORMAL (4.8cm/s) : 2,985Hz - 3,015Hz DOUBLE (2.4cm/s) : 1,493Hz - 1,507Hz

5. Confirm the frequency difference between the beginning and the end of tape should be 1.5%.

NORMAL (4.8cm/s) : 45Hz DOUBLE (2.4cm/s) : 22.5Hz

RV602

C606

R605

R609

R423

R340

C339

R341

C221

R344

R354

R338

B E B

C336

C337

Q342

Q335

R337

C338

R339

C333

R606

R336

Q336

RV601

C332

TH601

C70

Q334

C410

R309

C86

R335

CN303

FB303

C340

Adjustment Location: Main board (See page 9)

TAPE DECK SECTION 0 dB = 0.775 V

Test T ape

Type Signal Used for

WS-48A 3 kHz, 0 dB Tape Speed Adjustment

Tape Speed Adjustment

Procedure:

test tape WS-48A (3kHz, 0dB)

frequency counte

16Ω

set

i headphone jack (J401)

WM-GX410

)

TP333 (LPF)

TP8

TP3

Q308

C43

R313

Q307

C71

C17

R312

C16

C12

R18

RV1

C31

R22

TUNER SECTION 0 dB = 1 µV

AM Section

FUNCTION switch: AM

AM RF SSG

30% amplitude modulation by 400Hz signal. Output level : as low as possible

Put the lead-wire antenna close to the set.

set

level meter

Ω

headphone jack (J401

FM Section

FUNCTION switch: FM

FM RF SSG

0.01

set

30% amplitude modulation by 1kHz signal. Deviation : 75kHz Output level : as low

as possible

main board TAP66

• Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

RV2 999 kHz <1,000kHz>

level meter

Ω

headphone jack (J401 (side B)

no mark : 9kHz step

< > : 10kHz step

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust parts Frequency

Confirmation

AM TRACKING ADJUSTMENT

<530kHz>

531kHz

<1,710kHz>

1,602kHz

Reading on digtal

voltmeter

1.1 ± 0.4V

5.0 ± 0.6V

Adjustment for a maximum reading on level meter.

L3 <620 kHz> 621 kHz

CT1 <1,400 kHz> 1,404 kHz

FM FREQUENCY COVERAGE CONFIRMATION

Frequency display Reading on digtal voltmeter

Confirmation 87.5 MHz Standard value : 4.2 ± 0.5 V Confirmation 108 MHz 9.1 ± 0.5 V

FM TRACKING ADJUSTMENT

Adjustment for a maximum reading on level meter.

L4 87.5 MHz

Confirmation 108 MHz

Adjustment Location: Main board (See page 9)

[MAIN BOARD] (SIDE A)

TP (LPF)

digital voltmete

(DC range)

WM-GX410

TP(LPF)

TP8

Q308

C43

R313

Q307

C56

C17

C89

R312

C16

C12

R18

RV1

C31

RV2

C49

R22

FM VCO Adjustment

Procedure:

FM RF SSG

0.01

Carrier frequency : 98MHz Deviation : None Output level : 562

TAP66

(ANT)

V (55dB)

[MAIN BOARD] (SIDE B)

ND C905

CND

908

-3

C920

C40

S302

REC

-4

TAP66

FB306

FB305

C35

1. Connect the resistor 10kΩ between TP8 and TP(LPF).

2. Connect the frequency counter to TP8 (IC8 7 pin).

3. Set FUNCTION switch to FM.

4. Tune the set in 98MHz.

5. Adjust RV1 so that the reading on the frequency counter becomes 76 kHz. Specifications: 75 kHz - 77 kHz

frequency counter

TP8 (IC1 7 pin)

Adjustment Location:

MAIN BOARD (SIDE A)

RV2 : AM IF adjustment

L4 : FM Tracking Adjustment

L7 : AM Frequency coverage adjustment

RV602 : Tape Speed Adjustment (4.8cm/s)

RV1 : FM VCO adjustment

MAIN BOARD (SIDE B)

CT1 : AM T rac king Adjustment

[MAIN BOARD]

(SIDE A)

Adjustment Location: Main board (See page 9)

10k

L3 : AM Tracking Adjustment

RV601: Tape Speed Adjustment (2.4cm/s)

Ω

WM-GX410

SECTION 4 DIAGRAMS

4-1. IC Pin Function Descriptions IC701 (SYSTEM CONTROL/LCD DRIVE) LC723483 W-9C33-E

Pin No. Pin name I/O Description

1 XOUT O Connected to 75kHz Crystal oscillator 2 TEST 2 I For Test (Connected to GND) 3 MECHA REC I REC mode signal input

4 to 6 PA3 to 1 I Control key inputs

7 KO2 O Key source signal output 8 KO1 O Key source signal output

9 REC CTRL O REC control signal output L: REC 10 AMP ON O Power amplifier on/off control signal output 11 SD I SD input 12 COMP I COMP input 13 PUSH I Tuning dial (S701) common switch signal input 14 MECHA TAPE I Tape on/off detection signal input 15 RADIO ON O Radio on/off control signal output 16 BAND O Band select signal output 17 TUNING-B I Tuning dial (S701) B phase signal input 18 TUNING-A I Tuning dial (S701) A phase signal input 19 MUTE O Mute signal output 20 BEEP O Beep signal output 21 BACK UP VOLTAGE I Back-up voltage detection signal input 22 BATT LEVEL I Battery voltage detection signal input 23 VERSION I Destination select signal input 24 GND — Ground terminal 25 TUNER MODE INPUT I Tuning mode select switch (S707) signal input 26 2X INPUT I Tape speed select switch (S706) signal input 27 PAUSE I Pause switch (S702) signal input 28 HOLD I HOLD switch (S705) signal input 29 SHUTDOWN O Not used (open) 30 MOTOR BRAKE O Motor brake control signal output 31 MOTOR CTL O Motor control signal output

32 to 44 S13 to S1 O LCD driver segment output terminal 45 to 48 COM4 to 1 O LCD driver common output terminal

49 TU O Output for tuning voltage generator

50 to 53 DBR4 to 1 I For LCD power supply booster

54 RESET I System reset signal input 55 HCTR NC — Not used (open) 56 VDD — Power supply terminal 57 FM IN I FM VCO input 58 AM IN I AM VCO input 59 GND — Ground terminal 60 E0 O Tuning signal (PWM) output 61 AIN I LPF amplifier input 62 AOUT O LPF amplifier output 63 TEST 1 I For test (connected to ground) 64 XIN I Connected to 75kHz Crystal oscillator

+ 22 hidden pages

Sony WMGX-410 Service manual

SPECIFICATIONS

TABLE OF CONTENTS

2-1. DISASSEMBLY FLOW

DISASSEMBLY

2-2. CABINET (CENTER), CABINET FRONT ASSY

2-3. MAIN BOARD

2-4. MECHANISM DECK (MT-WMFX410-175)

2-5. CASSETTE HOLDER SUB ASSY

2-6. SUB BOARD

2-7. REC/PB/ERASE HEAD (HRPE301), BELT (AR), CAPSTAN/REEL MOTOR (M601)

ADJUSTMENTS

3-1. MECHANICAL ADJUSTMENTS

3-2. ELECTRICAL ADJUSTMENTS

4-1. IC Pin Function Descriptions IC701 (SYSTEM CONTROL/LCD DRIVE) LC723483 W-9C33-E