Sony Walkman WM-FX271 Manual de usuario

– 1 –

MICROFILM

SERVICE MANUAL

US Model

WM-FX271/FX275

Canadian Model

AEP Model

E Model

Chinese Model

WM-FX271

WM-FX271/FX275

RADIO CASSETTE PLAYER

Photo: WM-FX271

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)

Power requirements

3 V DC batteries R6 (AA) ×2/External DC 3 V power sources

Dimensions

91.4 ×115.5 ×35.9 mm (3 5/8 ×4 5/8 ×1 7/16 inches) (w/h/d) incl.

projecting parts and controls

Mass

Approx. 150 g (5.3 oz.)

Approx. 230 g (8.2 oz.) incl.batteries and a tape

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-FX171

Tape Transport Mechanism Type MF-WMFX171-114

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.

Ver 1.0 1999. 02

– 2 –

TABLE OF CONTENTS

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

2. DISASSEMBLY

2-1. Cabinet (Front) Sub Assy .................................................... 4

2-2. Main Board ......................................................................... 5

2-3. Holder (Sub) Assy, Cassette ................................................ 5

2-4. Mechanism Deck................................................................. 6

2-5. Belt and Motor .................................................................... 6

3. MECHANICAL ADJUSTMENTS ................................. 7

4. ELECTRICAL ADJUSTMENTS

Tape Section ............................................................................ 7

Tuner Section........................................................................... 8

5. DIAGRAMS

5-1. IC Pin Description............................................................. 10

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

5-3. Printed Wiring Board ........................................................ 13

5-4. Schematic Diagram ........................................................... 15

6. EXPLODED VIEWS

6-1. Cabinet Section ................................................................. 18

6-2. Tape Mechanism Section-1 ............................................... 19

6-3. Tape Mechanism Section-2 ............................................... 20

7. ELECTRICAL PARTS LIST ........................................ 21

– 3 –

SECTION 1

GENERAL This section is extracted

from instruction manual.

– 4 –

SECTION 2

DISASSEMBLY

2-1. CABINET (FRONT) SUB ASSY

Note : When installing, fit the knobs and switches.

Cabinet (front) sub assy Main boardSet Holder (sub) assy, cassette Belt and Motor

Mechanism deck

Insert the precision screwdriver

(1.4 mm flat-blade) into the slit

at claw

and release the claw.

Remove the cabinet (front) sub assy.

(Release all claws

alphabetical order.)

• The equipment can be removed using the following procedure.

cabinet (front) sub assy

holder (sub) assy, cassette

FHI

S71

cabinet (front) sub assy

Note :When removing the cabinet, put cloth

on the end of a screwdriver or use a

polyacetal driver to avoid damage to

the cabinet.

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

– 5 –

2-2. MAIN BOARD

two claws

HEAD FLEXIBLE board (CN301)

Unsolder the 4 places.

MAIN board

screw (M1.4), toothed lock (WH)

Open the holder (sub) assy, cassette.

holder (sub) assy, cassette.

spring (torsion

)

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.

– 6 –

2-4. MECHANISM DECK

2-5. BELT AND MOTOR

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.

• How to apply the belt

belt

motor

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

wheel assy (NP), capstan

belt

M901

– 7 –

0000

jack (J301)

digital frequency

counter

set

Ω

test tape

WS-48A

(3 kHz, 0 dB)

PRECAUTION

• Supplied voltage : 2.5V

• Switch and control position

VOLUME control : maximum

AVLS switch : NORM

• 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)

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

Adjustment Location:

RV601

– 8 –

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

• 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.

L1 CT1

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

( ): Except US, Canadian model

TUNER SECTION 0 dB = 1 µV

• FM Section

Setting:

RADIO ON/OFF switch: ON

BAND switch : FM

FM Tuning Voltage Adjustment

FM TUNING VOLTAGE ADJUSTMENT

Adjust for a 8.5 ± 0.3 (14.5 ± 0.5)Vdc reading on digital voltmeter.

108 MHz

FMTracking Adjustment

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

Output level: as low as possible

digital

voltmeter

TP (VT)

Main board

FM RF signal

generator

0.01

F(FM RF IN)

Main boar

(GND)

jack (J301)

set

Ω

level meter

(range: 0.5-5 V ac

)

FMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

87.5 (65.0) MHz

( ): East European model

• AM Section

Setting:

RADIO ON/OFF switch: ON

BAND switch : AM

AMTuning Voltage Adjustment

AMTUNING VOLTAGE ADJUSTMENT

Adjust for a 1.1 ± 0.1 Vdc reading on digital voltmeter.

530 (531) kHz

( ): Except US, Canadian model

AM IF Adjustment, AMTracking Adjustment

Modulation: 400Hz, 30%

Output level: as low as possible

– 9 –

FM TUNING

VOLTAGE

ADJUSTMENT

FM TRACKING

ADJUSTMENT

AM TUNING

VOLTAGE

ADJUSTMENT

AM IF

ADJUSTMENT

CT1

AM TRACKING

ADJUSTMENT

Adjustment Location: main board

Measurement Points: main board

(FM RF IN)

(VT)

FM RF INVT

– 10 –

5-1. IC PIN DESCRIPTION

• IC701 µPD17072GB-559-1A7 (SYSTEM CONTROL/LCD DRIVE)

Pin No. Pin Name I/O Pin Description

1 INIT O Initialize output

2, 3 NC — Not used.

4 MEGA BASS O MEGA BASS ON/OFF output (L: ON, H: OFF)

5 RADIO-ON O Radio circuit power control output

6 – 8 KEY OUT1 – 3 O Key matrix output 1 – 3

9 NC — Not used.

10, 11 KEY IN1, 3 I Key input 1, 3

12, 13 BTT-REF1, 2 I Reference voltage input for battery voltage check.

14 MUTE OUT O Mute output (Mute ON: L, Mute OFF: input)

15 SD I SD (with local) signal input

16 BAND O Radio band select output (AM: L, FM: input)

17 HOLD I Key hold input (Key input effect: L, Key input ineffect: H)

18 GND — Ground

19 EO O PLL error out output

20 VCO (AM) I VCO (AM) input

21 VCO (FM/TV) I VCO (FM) input

22 VDD2 — Voltage regulator for PLL.

23 VDD1 — Power supply pin

24 XO — Crystal oscillator output (75 kHz)

25 XI — Crystal oscillator input (75 kHz)

26 VDD5 — Voltage regulator for oscillation circuit.

27 VDD3 — Power supply for LCD driver.

28, 29 CAP1, 2 — Stabilized capacitor connection of crystal oscillation power supply.

30 VDD4 — Power supply for LCD driver.

31 – 34 COM0 – 3 O LCD driver common output

35 – 49 LCD0 – 14 O LCD driver output

50 CE I L: Clock stop, H: Normally operation

51 TAPE ON I At TAPE ON: H

52 BEEP O BEEP output

53 NC — Not used.

54 KEY IN2 I Key input 2

55 NC — Not used.

56 KEY IN4 I Key input 4

SECTION 5

DIAGRAMS

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