Sony Walkman WM-FX481 Bedienungsanleitung

Ver 1.0 2001.04

WM-FX481

SERVICE MANUAL

RADIO CASSETTE PLAYER

SPECIFICATIONS

E Model

Chinese Model

Model Name Using Similar Mechanism NEW

MD Mechanism Type

MF-WMFX481-114 (5E, 6E, 9E)

MF-WMFX467-114 (CH)

9-873-125-11

2001D0200-1

Sony Corporation

Personal Audio Company

Shinagawa Tec Service Production Group

• Abbreviation

CH : Chinese

9E : No Indication of country of origin

5E, 6E : Indication of country of origin

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WM-FX481

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

1. GENERAL ...................................................................... 2

2. DISASSEMBLY

2-1. Cabinet (Front), Cabinet (Center) Sub ASSY ............ 3

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

2-3. Mechanism Deck ........................................................ 4

2-4. Belt, Capstan/reel Motor (M601),

Magnetic Head (Playback) (HP601) ........................... 4

2-5. Cassette Holder ........................................................... 5

3. ADJUSTMENTS

3-1. Mechanical Adjustments ............................................. 6

3-2. Electrical Adjustments ................................................ 6

4. DIAGRAMS

4-1. Explanation of IC Terminals ....................................... 9

4-2. Block Diagram .......................................................... 10

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

4-4. Printed Wiring Boards – Main Section (Side A) – ... 12

4-5. Printed Wiring Boards – Main Section (Side B) – ... 13

5. EXPLODED VIEWS

5-1. Cabinet Section ......................................................... 15

5-2. Mechanism Deck Section

(MF-WMFX467-114:CH)

(MF-WMFX281-114:5E, 6E, 9E) ..... 16

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

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 dam-

aged by heat.

TABLE OF CONTENTS

SECTION 1

GENERAL

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SECTION 2

DISASSEMBLY

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

2-1. CABINET (FRONT), CABINET (CENTER) SUB ASSY

2-2. MAIN BOARD

zThe equipment can be removed using the following procedure.

Main boardCabinet (center) sub ASSY

Cassette holder

Mechanism deck Belt, Capstan/reel motor (M601)

Magnetic head (playback) (HP601)

Set

Cabinet (front)

Note : Use the precision driver with coverd a point

by cloth to release the claw.

Be careful not to damage claws.

Cabinet (Front)

Cabinet (center) sub ASS

Cassette holder

4Claw

1Claws

3Claws

1Claws

Main board

1Screw

Orange

Black

White

Red

Cabinet (center) sub ASS

Head flexible board

2Remove solder

3Claws

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2-3. MECHANISM DECK

2-4. BELT, CAPSTAN/REEL MOTOR (M601), MAGNETIC HEAD (PLAYBACK) (HP601)

Mechanism deck

Cabinet (center) sub ASS

1Claws

wheel ASSY (P), capstan

Belt

• How to apply the belt

Capstan/reel motor

(M601)

Belt

Stopper

Claw

magnetic head

(PLAYBACK)

(HP601)

Capstan/reel motor

(M601)

Screws (M1.4)

Mechanism deck

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WM-FX481

1Insert the spring (torsion) to the L shape slot as shown in the figure.

2,3Insert the hinge of the “Cassette holder ”.

4Close the “Cassette holder” then press it.

2-5. CASSETTE HOLDER

zCAUTIONS DURING ASSEMBLY

Cassette holder

4Spring (torsion)

Hinge

Cabinet (center)

sub ASSY

Hinge

Projection

Hinge

Projection

3Move the hinge away

from projection

2Move the hinge away

from projection

L shape slot

Spring (torsion)

Hinge

Cassette holde

Cabinet (center) sub ASSY

124

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3-1. MECHANICAL ADJUSTMENTS

PRECAUTION

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

swab :

playback head pinch roller

capstan rubber belt

2. Demagnetize the playback head with a head demagnetizer.

Do not use a magnetized screwdriver for the adjustments.

3. These measurement and adjustment should be performed with

the rated power supply voltage (2.5 V) unless otherwise noted.

Torque Measurement

Mode Torque meter Meter reading

FWD

1.97 – 4.11 mN • m

20 – 42 g • cm

(0.28 – 0.58 oz• inch)

FWD

CQ-102C less than 0.19 mN • m

less than 2 g • cm

back tension (less than 0.027 oz• inch)

1.97 – 4.11 mN • m

REV 20 – 42 g • cm

(0.28 – 0.58 oz• inch)

REV

CQ-102RC less than 0.19 mN • m

less than 2 g • cm

back tension (less than 0.027 oz• inch)

FF, REW CQ-201B

more than 5.89 mN • m

more than 60 g • cm

(more than 0.84 oz• inch)

SECTION 3

ADJUSTMENTS

3-2. ELECTRICAL ADJUSTMENTS

PRECAUTION

• Supplied voltage : 2.5V.

• Switch and control position (MENU display)

MEGA BASS : OFF

VOLUME control (RV301) : maximum

AVLS : OFF (No indicated)

FM MODE : 5E, 6E : DX (No indicated)

9E, CH : STEREO (No indicated)

• Abbreviation

CH : Chinese

9E : No Indication of country of origin

5E, 6E: Indication of country of origin

TAPE SECTION

Test Tape

Type Signal Used for

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

Tape Speed Adjustment

Procedure :

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

just RV601 so that the frequency counter reading becomes

3,000Hz.

Standard value : 2,985–3,015Hz

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

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

reading of step 1.

Adjustment Location :

0 dB = 0.775V

set

test tape

WS-48A

(3kHz, 0dB)

frequency counte

16 Ω

phones jack (J301)

RV601 : Tape speed Adjustmen

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AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 620kHz <621kHz>

CT1 1,400kHz <1,395kHz>

FM FREQUENCY COVERAGE CONFIRMATION

Frequency display Reading on digtal voltmeter

Confirmation 87.5MHz Standard value : 6.5V or less

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 98MHz

Confirmation 108MHz

TUNER SECTION

AM Section

BAND : AM

FM Section

BAND : FM

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

RV2 1,000kHz <999kHz>

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust parts Frequency display Reading on digtal

voltmeter

Confirmation 530kHz Standard value : 3V or less

L7 1,710kHz Adjustment value : 10.0V<9.0V>

<1,602kHz> Standard value : 9.9-10.1V

<8.9 – 9.1V>

Adjustment Location : Main board (See page 8)

0 dB = 1µV• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors.

AM RF signal

generator

30% amplitude modulation by 400Hz

signal.

Output level : as low as possible

Put the lead-wire

antenna close to

the set.

set

16 Ω

phones jack (J301)

level meter

Frequency Coverage Adjustment

Setting :

J301

9E,CH

5E,6E

JR3

C40

R207

FB301

FB201

FB101

C35

R21 D5

C16

PWOUT

(R)

(L)

STID

(COM)

PWOUT

GND

MAIN BOARD (SIDE B)

FM RF signal

generator

33.75kHz frequency

deviation by 1kHz signal.

Output level :

as low as possible

(FM IN) 0.01

no mark : 10kHz step

< > : 9kHz step

D704

R709

C706

L402

C303

S709

ENTER

PB3

GND

VT TUNER

VCC S713

TP (VT)

TP (GND)

digital voltmeter

(DC range)

MAIN BOARD (SIDE B)

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Adjustment Location :

FM VCO Adjustment

Procedure :

1. Connect the level meter as shown in the figure.

2. Turn the set to 98MHz.

3. Adjust RV1 so that the wave form to be maximum.

Stereo opration shall be normal.

J301

9E,CH

5E,6E

JR3

C40

R207

FB301

FB201

FB101

C35

R21 D5

C16

PWOUT

(R)

(L)

STID

(COM)

PWOUT

GND

MAIN BOARD (SIDE B)

FM RF signal

generator

Carrier frequency : 98MHz

33.75kHz frequency deviation by 1kHz signal.

Modulation : L = -R

Output level : as low as possible

(FM IN) 0.01

set

16 Ω

phones jack (J301)

level meter

IC1

[MAIN BOARD] (SIDE A)

RV1 : FM VCO Adjustment

L7 : AM Frequency Coverage Adjustment

RV2 : AM IF Adjustment

L4 : FM Tracking Adjustmen

L3 : AM Tracking Adjustment

CT1 : AM Tracking Adjustment

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SECTION 4

DIAGRAMS

Pin No. Pin name I/O Descliption

1 XOUT O Crystal oscillator output (75kHz).

2 TEST2 – Not used (Ground).

3 PA3 I Key input.

4 PA2 I Key input.

5 PA1 I Key input.

6 PA0 I Key input.

7 PB3 O Key output.

8 PB2 O Key output.

9 PB1 O Key output.

10 AVLS O AVLS signal output.

11 MOTOR CTL O Motor control output.

METAL/NOR

O METAL/NORMAL type tape and DX/LOCAL select signal output.

DX/LOCAL

13 E/CA I Destination select.

14 BAND O Tuner band select signal output.

15 SD I Tuning signal detect input.

16 COMP I Compalator input.

17 N/R SW I FWD/REV mode signal input.

18 BACK UP I Back up voltage input.

19 AMP ON O Power ON/OFF signal output.

20 BEEP O Beep signal output.

21 BATT CHECK I Back up cancel input.

22 BATT REF I A/D reference voltage input.

23 HOLD I HOLD switch input. “H” :ON, “L” :OFF

24 VSS – Ground terminal.

25 RADIO ON O Radio ON signal output.

26 MEGA BASS O MEGA BASS ON signal output.

27 MUTE O Mute ON signal output.

28 TAPE I Tape ON input.

29 PRE CTL O Preamplifier control output.

30-44 S1-15 O LCD segment output.

45-48 COM1-4 O LCD common output.

49-52 DBR1-4 – LCD power supply.

53 RESET I Reset input (Fixed “H”).

54 TU VCC – Power supply.

55 VDD – Power supply.

56 FM IN I FM osc frequency input.

57 AM IN I AM osc frequency input.

58 VSS – Ground terminal.

59 E.O O Error (PWM) signal output.

60 LPF IN I LPF input.

61 LPF OUT O LPF output.

62 LPF GND – Ground terminal.

63 TEST 1 – Not used (Ground).

64 X IN I Crystal oscillator input (75kHz).

4-1. EXPLANATION OF IC TERMINALS

IC702 LC72348W-CFX1721(5E, 6E) SYSTEM CONTROL

IC702 LC72348W-CFX1726(9E, CH) SYSTEM CONTROL

• Abbreviation

CH : Chinese

9E : No Indication of country of origin

5E, 6E : Indication of country of origin

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1010

WM-FX481

4-2. BLOCK DIAGRAMS

• Abbreviation

CH : Chinese

9E : No Indication of country of origin

5E, 6E : Indication of country of origin

RV1

CT1

X701

HP601

M601

J301

D703

S701

S301

S302

RV301

RV2

D404

RV601

D704

75kHz

(TAPE ON)

(N/R SW)

FM/AM/TV

FRONT-END,

IF,DET,FM MPX

REGV

FTLO

AMLO

COMP

BAND

TUNE

IFCT

MREF

ARFI

FMRO

VCC

VCO

MPRG FM VCO

FM TRACKING

ANTENNA

FERRITE ROD

AM TRACKING

COVERAGE

AM FREQUENCY

RV2

AM IF

COMP

BAND

RADIO B+

SWITCH

Q701

RADIO ON

MEGA BASS

MUTE

PRE CTL

MOTOR CTL

AMP ON

VDD

HOLD

BATT REF

BEEP

BATT CHECK

TAPE

N/R SW

DRY BATTERY

SIZE "AA"

2PCS, 3V

(IEC DESIGNATION R6)

COM1-4 PA0-3 PB1-3

LIQUID CRYSTAL DISPLAY PANEL CONTROL KEY

S/S

SYSTEM

POWER

SWITCH

Q501

ON/OFF

Q502

CHECK

BATTERY

IC701

OFF

HOLD

AM IN

LPF OUT

LPF IN

E.O

FM IN

TAPE SELECTOR

SWITCH

Q301

R-CH

LCH

RCH

LCH

REV

FWD

HEAD

PLAYBACK

VREF

CAPSTAN/REEL

MOTOR

COM

M VCC

IN+ TAPE

SPEED

VOLUME

POWER IN(L)

POWER OUT(R)

POWER OUT(L)

POWER OUT(COM)

R-CH

MIX IN(L)

PRE OUT(L)

PRE NF(L)

SYSTEM

CONTROL

IC702

PRE AMP,

MEGA BASS,

HEADPHONE AMP,

MOTOR CONTROL

IC301

IC1

R-CH IS OMITTED:SAME AS L-CH

VREF

L3,CT1

MIX OUT(L)

R-CH

H.P IN(L)

REV IN(L)

REV IN(R)

FWD IN(R)

FWD IN(L)

X IN

L OUT

R OUT

W OUT

V OUT

U OUT

X OUT

SWITCH

FM IN

TV IN

PLT2

PLT1

BUFFER

SWITCH

LOCAL/DX

NOR/METAL

VSS

VSS PRE GND

M VREF

AVLS

SWITCH

Q200

E/CA

AVLS

R-CH

6-3 9-7

S712,713

S709,710

S702-707

S1-15

44-30 48-45

LCD701

PW MUTE

LB SW

9E,CH

5E,6E

• Signal path.

F: FM

f: AM

E: PB

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