Sony Walkman WM-FX277 Bedienungsanleitung

Ver 1.0 2001.03

WM-FX277

SERVICE MANUAL

RADIO CASSETTE PLAYER

SPECIFICATIONS

E Model

Chinese Model

Model Name Using Similar Mechanism NEW

MD Mechanism Type MF-WMFX241-114

9-927-695-31

2001C0200-1

Sony Corporation

Audio Entertainment Group

General Engineering Dept.

WM-FX277

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

1. SERVICING NOTE ...................................................... 3

2. GENERAL ...................................................................... 3

3. DISASSEMBLY

3-1. Cabinet (Front) ........................................................... 4

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

3-3. Mechanism Deck ........................................................ 5

3-4. Belt, Capstan/reel Motor (M601),

Magnetic Head (Playback) (HP601) ........................... 5

3-5. Cassette Holder ........................................................... 6

4. ADJUSTMENTS

4-1. Mechanical Adjustments ............................................ 7

4-2. Electrical Adjustments ................................................ 7

5. DIAGRAMS

5-1. Explanation of IC Terminals ..................................... 10

5-2. Block Diagram ........................................................... 11

5-3. Printed Wiring Boards – Main Section (Side A) – ... 12

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

5-5. Schematic Diagram ................................................... 14

6. EXPLODED VIEWS

6-1. Cabinet Section ......................................................... 17

6-2. Mechanism Deck Section (MF-WMFX241-114) ..... 18

7. ELECTRICAL PARTS LIST ................................... 19

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

WM-FX277

SECTION 1

SERVICING NOTE

In case of adjusting Tape Speed, you can easily to adjust RV601 by removing 7 claws on Window (LCD) and itself as shown in the figure.

1.Insert the precision screwdriver (Cover a point by cloth) in to the slit at claw.

2.Remove the window(LCD).

Note: Be careful not to damage claws.

Claws

Window(LCD)

Claws

RV601

SECTION 2

GENERAL This section is extracted from

instruction manual.

LOCATION AND FUNCTION OF CONTROLS

WM-FX277 SECTION 3

DISASSEMBLY

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

3-1. CASSETT HOLDER ASSY, CABINET (FRONT)

3-2. MAIN BOARD

• The equipment can be removed using the following procedure.

Main boardCassette holder ASSY

Cabinet (Front) Cassette holder

Mechanism deck Belt, Capstan/reel motor (M601),

Magnetic head (Playback) (HP601)

Set

Cabinet (Front)

Cassette holder ASS

Claws

Claw

Claws

Main board

Screw

Orange

Black

White

Red

Cassette holder ASS

Head flexible board

Remove solder

Claws

Note : Use the precision driver with coverd a point

by cloth to release the claw.

Be careful not to damage claws.

WM-FX277

3-3. MECHANISM DECK

3-4. BELT, CAPSTAN/REEL MOTOR (M601), MAGNETIC HEAD (PLAYBACK)(HP601)

Mechanism deck

Cassette holder ASS

Claws

Belt

Stopper

Claw

magnetic head

(PLAYBACK)

(HP601)

Capstan/reel motor

(M601)

Screws (M1.4)

Mechanism dec

WM-FX277

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.

3-5. CASSETTE HOLDER

zCAUTIONS DURING ASSEMBLY

Cassette holder

Spring (torsion)

Hinge

Projection

Hinge

Cabinet (center)

Hinge

Projection

Move the hinge away

from projection

Move the hinge away

from projection

Spring (torsion)

L shape slot

Hinge

Cassette holde

Cabinet (center)

124

WM-FX277

4-1. 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 to 4.90 mN•m

20 to 50 g • cm

CQ-102C (0.28 to 0.69 oz• inch)

FWD

less than 0.19 mN•m

less than 2 g • cm

back tension (less than 0.027 oz• inch)

FF, REW CQ-201B

5.89 to 19.61 mN•m

60 to 200 g • cm

(0.84 to 2.77 oz• inch)

SECTION 4

ADJUSTMENTS

4-2. ELECTRICAL ADJUSTMENTS

PRECAUTION

• Supplied voltage : 2.5V.

• Switch and control position

MEGA BASS (S709) : OFF

VOLUME control (RV301) : maximum

AVLS (S304) : NORM

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) and adjust RV601 so that

the frequency counter reading becomes 3,000Hz.

Standard value : 2,985–3,015Hz

2. Playback WS-48A (tape top and end) .

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

Ω

phones jack (J301)

RV601:

Tape speed Adjustmen

Refer to page 3 for Servicing note

WM-FX277

TUNER SECTION

AM section

BAND : AM

FM section

BAND :FM

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1 1400kHz <1395kHz>

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust parts Frequency display Reading on digtal

voltmeter

L4 530kHz <531kHz>Adjustment value : 1.2V

Standard value : 1.1–1.3V

Confirmation 1,710kHz <1,602kHz>Standard value : 9V or less

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 620kHz <621kHz>

CT1 1,400kHz <1,395kHz>

FM FREQUENCY COVERAGE ADJUSTMENT

Frequency display Reading on digtal voltmeter

L3 108MHz Adjustment value : 9.0V

Standard value : 8.7–9.3V

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 98MHz

Confirmation 108MHz

Adjustment Location : Main board

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

Ω

phones jack (J301)

level meter

Frequency Coverage Adjustment

Setting :

S303

-2 -1

R207

C10

C40

OUT

C29

C30 R

JR2

JR4

JR5

R107

FB101

CF2

CP1

FM RF signal

generator

33.75kHz frequency deviation

by 1kHz signal.

Output level :

as low as possible

CP1 IN

0.01

[MAIN BOARD]

(Side B)

C403

R403

(VT)

GND

R404

C405

C303

C402

TP (VT)

TP (GND)

[MAIN BOARD]

(Side B)

digital voltmeter

(DC range)

no mark : 10kHz step

< > : 9kHz step

WM-FX277

Adjustment Location :

[MAIN BOARD] (SIDE A)

L3 : FM Frequency Coverage Adjustment

L2 : FM tracking Adjustment

L4 : AM Frequency Coverage Adjustment

T1 : AM IF Adjustment

CT1 : AM Tracking Adjustment

L1 : AM Tracking Adjustment

IC1

WM-FX277 SECTION 5

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 LOCAL/DX – Not used (OPEN).

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

12 LOCAL SW – Not used (OPEN).

13 TV (H) – Not used (OPEN).

14 BAND O Band select signal output.

15 SD I Tuning signal detect input.

16 COMP – Not used (OPEN)

17 N/R SW – Not used (OPEN)

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 –––––––––– – Not used (Ground).

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 MOTOR CTL O Motor control output.

31 ID I Destination select input.

32-44 S1-13 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 – Not used (OPEN).

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).

5-1. EXPLANATION OF IC TERMINALS

IC702 LC72348W-9A36 SYSTEM CONTROL

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