Sony Walkman WM-FX373 Manual de usuario

SERVICE MANUAL

RADIO CASSETTE PLAYER

US Model

WM-FX375

Canadian Model

Tourist Model

WM-FX373

AEP Model

E Model

Chinese Model

WM-FX373/FX375

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type

MT-WMEX372-114

• Frequency range

FM: 65.0 – 107.9 MHz (East European Model)

87.5 – 108 MHz (Italian, Saudi Arabia Model)

87.6 – 108 MHz (US, Canadian Model)

87.6 – 107.9 MHz (Other Model)

AM: 526.5 – 1,606.5 kHz (Italian, Saudi Arabia Model)

530 – 1,710 kHz (US, Canadian Model)

531 – 1,602 kHz (Other Model)

• Power requirements

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

• Dimensions

88.5 ×118.6 ×38.2 mm

(3 1/2×4 3/4×1 9/16 inches) (w/h/d) incl. projecting parts and controls

• Mass

Approx. 170 g (6.0 oz)

Approx. 250 g (8.9 oz) incl. batteries and a cassette

• Supplied accessories

Stereo headphones or Stereo earphones (1)/Belt clip (1)

Design and specifications are subject to change without notice.

SPECIFICATIONS

WM-FX373/FX375

Photo:WM-FX373

Dolby noise reduction manufactured under license

from Dolby Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol ;are trade-

marks of Dolby Laboratories Licensing Corporation.

9-923-344-12 Sony Corporation

2004C05-1 Personal Audio Company

Ver 1.2 2004.03

– 2 –

SECTION 1

GENERAL

TABLE OF CONTENTS

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

2. DISASSEMBLY ......................................................... 3

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

4. ELECTRICAL ADJUSTMENTS......................... 7

5. DIAGRAMS

5-1. Block Diagram ................................................................ 10

5-2. Printed Wiring Board ...................................................... 12

5-3. Schematic Diagram ......................................................... 15

6. EXPLODED VIEWS................................................ 21

7. ELECTRICAL PARTS LIST ............................... 24

This section is extracted from

instruction manual.

SERVICING NOTES

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.

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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.

– 3 –

CABINET (REAR) ASS’Y

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

SECTION 2

DISASSEMBLY

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

Insert the precision screw

driver (1.4 mm flat-blade) in to

the slit at claw

and release

the claw.

Remove the cabinet (rear) ass’y

(Release all claw

in alphabetical order.)

two screws

(B1.7

9) cabinet (rear) ass’

two claws

main board

Flexible board

(CN302)

Flexible board

(CN301)

toothed lock (WH) screw

(M1.4)

Remove four solders

of motor (M901).

MAIN BOARD

CABINET (REAR)

ASS’Y

DIAL POINTER

SETTING

BELT, MOTOR (M901)

MAGNETIC HEAD (HP901)

MAIN BOARD

CASSETTE HOLDER ASS’Y

NOTE FOR INSTALLATION MEGA BASS

UNIT

MECHANISM DECK

(MT-WMEX372-114)

–4 –

MECHANISM DECK (MT-WMEX372-114)

belt

motor (M901)

two special hea

screws (M1.4)

two screws (M1.4)

magnetic

head (HP901)

BELT, MOTOR (M901), MAGNETIC HEAD (HP901)

Remove the mechanism deck

(MT-WMEX372-114) to direction

of the arrow

two claws

–5 –

CASSETTE HOLDER ASS’Y

NOTE FOR INSTALLATION

Cassette holder ass’y

spring

(torsion)

Portion

to release

the hinge plate.

Insert a precision screw driver (1.4 mm flat-blade)

vertically in to portion

to release the hinge plate.

Cassette holder ass’y

Attach the spring (torsion)

as shown in the figure.

Insert the spring (torsion)

in the ditch to direction o

the arrow

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

–6 –

MEGA BASS UNIT

two knobs

(rotary)

stopper

flexible board

three claws

two claws

two switches

Remove the mega bass

unit to direction of

the arrow

dolby knob

M/B knob

Note for installation:

Check that two switches are latched

with dolby knob and M/B knob when

carrying out installation of the mega bass unit.

Turn the knob (TUNE)

fully in the arrow direction.

Mount the pointer

as shown in the figure

fig.

pointer guide rib

DIAL POINTER SETTING

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

– 7 –

SECTION 3

MECHANICAL ADJUSTMENTS SECTION 4

ELECTRICAL ADJUSTMENTS

PRECAUTION

1. Clean the following parts with a denatured-alcoholmoistened

swab:playback head pinch roller

capstan 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 (2.5 V) unless otherwise noted.

Torque Measurement

Tape Pulling Force Measurement

Mode Torque meter Meter reading

FWD 20 – 42 g•cm

CQ-102C (0.28 – 0.58 oz•inch)

FWD less than 2 g•cm

Back Tension (less than 0.03 oz•inch)

REV 20 – 42 g•cm

CQ-102RC (0.28 – 0.58 oz•inch)

REV less than 2 g•cm

Back Tension (less than 0.03 oz•inch)

FF, REW CQ-201B more than 50 g•cm

(more than 0.69 oz•inch)

Mode Torque meter Meter reading

FWD CQ-403A more than 30g

REV CQ-403R (more than 0.41 oz)

PRECAUTION

• Supplied voltage: 2.5 V (DC)

• Switch and control position

NORM CrO2/METAL·ST/MONO switch: NORM·ST

(EXCEPT US, Canadian, 5E, 6E model)

NORM CrO2/METAL·DX/LOCAL switch: NORM·DX

(US, Canadian, 5E, 6E model)

VOLUME control: maximum

TONE CONTROL HIGH and LOW: mechanical center

AVLS switch: NORM

MEGA BASS switch: OFF

DOLBY NR switch: OFF (FX375 only)

FM/AM/TAPE (RADIO OFF) switch: TAPE (RADIO OFF)

Test tape

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

3,000 ±15 Hz.

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

Check that the frequency counter reading is within 1.0% of

the reading of step 1.

Adjustment Location:

Type Signal Used for

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

0 dB=0.775 VTAPE SECTION

–

frequency counte

set

jack

test tape

WS-48A

(3kHz, 0 dB)

FX373 (Canadian): 32

Ω

others: 16

Ω

label (model)

RV601

– 8 –

FM SECTION

Setting:

FM/AM/TAPE (RADIO OFF) switch: FM

Repeat the procedure in each adjustment several times since L (3,

2) affects CT1 (3, 2) and CT1 (3, 2) affects L (3, 2). Both the

frequency coverage and tracking adjustments should end with the

final adjustment of the trimmer capacitors.

FM Frequency Coverage Adjustment

(( )): Italian, Saudi Arabia model, [ ]: East European model

FMTracking Adjustment

(( )): Italian, Saudi Arabia model, [ ]: East European model

0 dB=1 µV

TUNER SECTION

FM RF Signal

generator

0.01







MAIN board

(FM RF-IN

)

(GND)

75 kHz frequency

deviation by 1 kHz signal

Output level: as low possible.

Pointer SG Adjustment Reading on

position frequency part level meter

86 MHz

f minimum ((87.35 MHz)) L3

[64 MHz] maximum

109.5 MHz

f maximum ((108.25 MHz)) CT1-3

[109.5 MHz]

SG and set Adjustment Reading on

frequency part level meter

86 MHz

((87.35 MHz)) L2

[64 MHz] maximum

109.5 MHz

((108.25 MHz)) CT1-2

[109.5 MHz]

AM SECTION

Setting:

FM/AM/TAPE (RADIO OFF) switch: AM

Repeat the procedure in each adjustment several times since L (4,

1) affects CT1 (4, 1) and CT1 (4, 1) affects L (4, 1). Both the

frequency coverage and tracking adjustments should end with the

final adjustment of the trimmer capacitors.

AM IF Adjustment

AM Frequency Coverage Adjustment

( ): AEP, E model, (( )): Italian, Saudi Arabia model,

[ ]: East European model

AMTracking Adjustment

(( )): Italian, Saudi Arabia model,

[ ]: East European model

AM RF Signal

generator Put the lead-wire

antenna close to

the set.

30% amplitude modulation by

400 Hz signal

Output level: as low possible.

SG and set Adjustment Reading on

frequency part level meter

1,000 kHz T1 maximum

Pointer SG Adjustment Reading on

position frequency part level meter

505 kHz

f minimum (505 kHz) L4

((516.5 kHz))

[505 kHz] maximum

1,750 kHz

f maximum (1,680 kHz) CT1-4

((1,631.5 kHz))

[1,680 kHz]

SG and set Adjustment Reading on

frequency part level meter

620 kHz

((800 kHz)) L1

[620 kHz] maximum

1,400 kHz

((1,300 kHz)) CT1-1

[1,400 kHz]

jack

FX373 (Canadian): 32

Ω

others: 16

Ω

set +

level mete

–

jack

FX373 (Canadian): 32

Ω

others: 16

Ω

set +

level mete

–

– 9 –

• Adjustment Location:

(FM RF-IN)

CT1-2

FM Tracking Adjustment

CT1-1

AM Tracking Adjustment

CT1-3

FM Frequency Coverage Adjustment

CT1-4

AM Frequency Coverage Adjustment

[MAIN BOARD]

– Side B –

FM Tracking Adjustment

AM Tracking Adjustment T1

AM IF Adjustment

FM Frequency Coverage Adjustment

AM Frequency Coverage Adjustment

[MAIN BOARD]

– Side A –

WM-FX373/FX375

– 9 – – 10 – – 11 –

5-1. BLOCK DIAGRAM

SECTION 5

DIAGRAMS

• Adjustment Location:

(FM RF-IN)

CT1-2

FM Tracking Adjustment

CT1-1

AM Tracking Adjustment

CT1-3

FM Frequency Coverage Adjustment

CT1-4

AM Frequency Coverage Adjustment

[MAIN BOARD]

– Side B –

FM Tracking Adjustment

AM Tracking Adjustment T1

AM IF Adjustment

FM Frequency Coverage Adjustment

AM Frequency Coverage Adjustment

[MAIN BOARD]

– Side A –

Ver 1.2

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