Sony Walkman WM-FX477 User manual

– 1 –

MICROFILM

SERVICE MANUAL

US Model

Canadian Model

AEP Model

E Model

Chinese Model

WM-FX477/FX479

RADIO CASSETTE PLAYER

Photo: WM-FX477

Radio section

Frequency range

FM: 65 – 74/87.5 – 108 MHz (East

European)

87.5 – 108 MHz (Except East European)

AM:530 – 1,710 kHz (US, Canadian)

531 – 1,602 kHz (Except US, Canadian)

Tape section

Frequency response

(Dolby NR off)

Playback: 30 – 14,000 Hz

Output

Headphones/earphones (2jack)

Load impedance 8 – 300 ohms

General

Power requirements

3 V DC batteries R6 (AA) ×2/

External DC 3 V power sources

Dimensions (w/h/d)

Approx. 115.8 ×85 ×33.4 mm

(4 5/8 ×3 3/8 ×1 3/8 inches) incl.

projecting parts and controls

Mass

Approx. 175 g (6.2 oz.)/Approx.

255 g (9.0 oz.) incl.batteries and a

cassette

Supplied accessories

Stereo headphones or Stereo

earphones (1)

Carrying case (1)

Design and specifications are subject to change without

notice.

SPECIFICATIONS

Model Name Using Similar Mechanism WM-FX483

Tape Transport Mechanism Type MF-WMFX483-147

Notes on Chip Component Replacement

•Never reuse a disconnected chip component.

•Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

DolbynoisereductionmanufacturedunderlicensefromDolbyLabo-

ratories Licensing Corporation.

“DOLBY” and the double-D symbol aare trademarks of Dolby

Laboratories Licensing Corporation.

Ver 1.0 1999. 02

– 2 –

TABLE OF CONTENTS

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

2. DISASSEMBLY

2-1. Cabinet (Front) Assy ........................................................... 5

2-2. Display Board ..................................................................... 6

2-3. Holder (Sub) Assy, Cassette ................................................ 6

2-4. Main Board ......................................................................... 7

2-5. Mechanism Deck................................................................. 7

2-6. Belt and Motor .................................................................... 8

3. MECHANICAL ADJUSTMENTS ................................. 9

4. ELECTRICAL ADJUSTMENTS

Tape Section ............................................................................ 9

Tuner Section......................................................................... 10

5. DIAGRAMS

5-1. IC Pin Description............................................................. 12

5-2. Block Diagram .................................................................. 14

5-3. Schematic Diagram –Main Section–................................. 16

5-4. Printed Wiring Board –Main Section– .............................. 19

5-5. Printed Wiring Board –Display Section– .......................... 21

5-6. Schematic Diagram –Display Section–............................. 23

6. EXPLODED VIEWS

6-1. Cabinet Section ................................................................. 26

6-2. Tape Mechanism Deck Section ......................................... 28

7. ELECTRICAL PARTS LIST......................................... 29

– 3 –

SECTION 1

GENERAL This section is extracted

from instruction manual.

– 4 –

– 5 –

DEF

S701

cabinet (front) assy

screw (1.7x2.5), tapping

holder (sub) assy, cassette

Cabinet (front) assySet Main board

Holder (sub) assy, cassette

Belt and MotorMechanism deckDisplay board

SECTION 2

DISASSEMBLY

2-1. CABINET (FRONT) ASSY

Note : When installing, fit the knobs and switches.

Insert the precision screwdriver

(1.4 mm flat-blade) into the slit

at claw

and release the claw.

Remove the cabinet (front) assy.

(Release all claws

alphabetical order.)

• The equipment can be removed using the following procedure.

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

Note :When removing the cabinet, put cloth

on the end of a screwdriver or use a

polyacetal driver to avoid damage to

the cabinet.

– 6 –

Open the holder (sub) assy, cassette.

holder (sub) assy, cassette

spring (torsion)

four claws

DISPLAY board

screws

2-2. DISPLAY BOARD

2-3. HOLDER (SUB) ASSY, CASSETTE

Insert a precision screwdriver

(1.4 mm flat-blade) vertically

into portion

to release the

hinge plate.

Portion

to release the

hinge plate.

– 7 –

three claws

HEAD FLEXIBLE board (CN303)

Unsolder the 4 places.

screw (M1.4x2.0), locking

MAIN board

switch

slider

2-5. MECHANISM DECK

2-4. MAIN BOARD

Note : When installing, fit the switch and slider.

Insert the precision screwdriver

(1.4 mm flat-blade) into the slit

and release three claws.

Remove the mechanism deck

in the direction of the arrow.

screw

three claws

– 8 –

belt

motor

wheel assy (SP), capstan

belt

• How to apply the belt

M901

two screws (screw (M1.4), special head)

2-6. BELT AND MOTOR

– 9 –

RV601

0000

jack (J301)

digital frequency

counter

set

Ω

test tape

WS-48A

(3 kHz, 0 dB)

PRECAUTION

• Supplied voltage : 2.5V

• Control position

VOL control : maximum

• Test Tape

Type Signal Used for

WS-48A 3 kHz, 0 dB tape speed adjustment

TAPE SECTION 0 dB = 0.775 V

Tape Speed Adjustment

Procedure:

PRECAUTION

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

swab :

playback head pinch lever assy

capstan wheel assy rubber belt

2. Demagnetize the playback head with a head demagnetizer.

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

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage (2.5V) unless otherwise noted.

Torque Measurement

Mode Torque meter Meter reading

FWD CQ-102C 20 – 42 g • cm

(0.28 – 0.58 oz • inch)

FWD CQ-102C less than 2 g • cm

Back Tension (less than 0.03 oz • inch)

REV CQ-102RC 20 – 42 g • cm

(0.28 – 0.58 oz • inch)

REV CQ-102RC less than 2 g • cm

Back Tension (less than 0.03 oz • inch)

FF, REW CQ-201B more than 60 g • cm

(more than 0.83 oz • inch)

SECTION 4

ELECTRICAL ADJUSTMENTS

SECTION 3

MECHANICAL ADJUSTMENTS

1. Playback WS-48A (tape center part) in the FWD state and

adjust RV601 so that the frequency counter reading

becomes 3,000 Hz.

Specification Value:

Digital frequency counter

2,985 to 3,015 Hz

2. Playback WS-48A (tape center part) in the REV state.

Check that the frequency counter reading is within ± 1.0% of

the reading of step 1.

Adjustment Location:

– 10 –

jack (J301)

set

Ω

level meter

(range: 0.5-5 V ac

)

Put the lead-wire

antenna close to

the set.

AM RF signal

generator

digital

voltmeter

TP (VT)

Main board

jack (J301)

set

Ω

level meter

(range: 0.5-5 V ac

)

FM RF signal

generator

0.01

F(FM RF IN)

Main boar

(GND)

digital

voltmeter

TP (VT)

Main board

• Repeat the procedures in each adjustment several times, and the

tracking adjustment should be finally done by the trimmer ca-

pacitors.

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

1,000 (999) kHz

( ): Except US, Canadian model

AMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 CT1

620 (621) kHz 1,400 (1,395) kHz

( ): Except US, Canadian model

TUNER SECTION 0 dB = 1 µV

• FM Section

Setting:

RADIO ON/BAND switch : FM

FM Tuning Voltage Adjustment

FM TUNING VOLTAGE ADJUSTMENT

Adjust for a 9.0 (14.5 ± 0.5) Vdc reading on digital voltmeter.

108 MHz

FM Tracking Adjustment

Modulation: 1 kHz, 75 kHz dev. (100%)

Output level: as low as possible

FMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

87.5 (65.0) MHz

( ): East European model

+0.5

• AM Section

Setting:

RADIO ON/BAND switch : AM

AM Tuning Voltage Adjustment

AMTUNING VOLTAGE ADJUSTMENT

Adjust for a 1.4 ± 0.1 Vdc reading on digital voltmeter.

530 (531) kHz

( ): Except US, Canadian model

AM IF Adjustment, AMTracking Adjustment

Modulation: 400 Hz, 30%

Output level: as low as possible

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