Sony Walkman WM-FX171 Bedienungsanleitung

WM-FX171/FX173/FX177

Canadian Model

WM-FX173/FX177

AEP Model

E Model

WM-FX171/FX173

SERVICE MANUAL

RADIO CASSETTE PLAYER

MICROFILM

SPECIFICATIONS

Model Name Using Similar Mechanism NEW

TapeTransport Mechanism Type MF-WMFX171-114

• Frequency range

FM : 87.6 - 107.9 MHz

AM : 531 - 1,602 kHz

• Power requirements

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

• Dimensions

FX173 : 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

FX171/FX177 : 88.5 ×118.6 ×37.6 mm

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

• Mass

FX173 : Approx. 165 g (5.9 oz) /Approx. 245g (8.7 oz) incl. batteries

and a cassette

FX171/FX177 : Approx. 160 g (5.7 oz) / Approx. 240 g (8.5 oz) incl.

batteries and a cassette

• Supplied accessories

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

Design and specifications are subject to change without notice.

Photo : WM-FX173

— 2 —

TABLE OF CONTENTS

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron aroud 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

damaged by heat.

SECTION 1

GENERAL

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

2. DISASSEMBLY

2-1. Cabinet (Front) Assy ·························································· 3

2-2. Main Board ········································································· 4

2-3. Cassette Lid ········································································4

2-4. Mechanism Deck ································································5

2-5. Belt, Motor (Reel/Capstan) ················································5

3. MECHANICAL ADJUSTMENT ······························6

4. ELECTRICAL ADJUSTMENT ································6

5. DIAGRAMS

5-1. Block Diagram ··································································· 8

5-2. Schematic Diagram (FX171/FX177 Models) ·················· 10

5-3. Printed Wiring Board (FX171/FX177 Models)················13

5-4. Printed Wiring Board (FX173 Model) ····························· 17

5-5. Schematic Diagram (FX173 Model) ································21

5-6. IC Block Diagrams ···························································24

6. EXPLODED VIEWS

6-1. Cabinet Section································································· 25

6-2. Main Board Section ··························································27

6-3. Mechanism Section-1 ······················································· 28

6-4. Mechanism Section-2 ······················································· 29

7. ELECTRICAL PARTS LIST ··································· 30

Thissection is extracted

frominstruction manual.

•LOCATION OF CONTROL

— 3 —

SECTION 2

DISASSEMBLY

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

Cassette lid

Cabinet (front) assy

Two screws

[screw (B 1.7

9), tapping]

2-1. CABINET (FRONT) ASSY

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.)

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

2-1. CABINET (FRONT) ASSY 2-2. MAIN BOARD

2-3. CASSETTE LID

2-4. MECHANISM DECK 2-5. BELT,

MOTOR (REEL/CAPSTA

— 4 —

Spring (torsion)

Open the cassette lid.

Cassette lid.

2-2. MAIN BOARD

2-3. CASSETTE LID

Insert a precision screwdriver

(1.4 mm flat-blade) vertically

into portion

to release the

hinge plate.

Portion

to release the

hinge plate.

Remove the four solders.

Screw (M 1.4), toothed lock (WH

)

Flexible board (CN302)

MAIN board

Two claws

Head flexible board (CN301)

— 5 —

Insert the precision screwdriver

(1.4 mm flat-blabe) in to the slit

and release two claws.

Remove the mechanism dec

in the direction of the arrow,

Two screws [screw (M 1.4), special head]

Motor (reel/capstan)

Belt

2-4. MECHANISM DECK

2-5. BELT, MOTOR (REEL/CAPSTAN)

— 6 —

SECTION 3

MECHANICAL ADJUSTMENT SECTION 4

ELECTRICAL ADJUSTMENT

PRECAUTION

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

sweb :

Playback head Pinch roller

Rubber belt Capstan

2. Demagnetize the playback head using a demagnetizer.

3. Do not use a magnetized screwdriver for adjustments.

4. After adjusting, apply screw-locking compound onto the

adjusted parts.

5. Unless specified otherwise, use a specified voltage (3.0V) to

perform the adjustments.

Torqu Measurement

Mode

FWD

Back Tension

REV

Back Tension

REW

Torque meter

CQ-102C

CQ-102RC

CQ-201B

Meter reading

20 - 30 g · cm

0.4 - 2.0 g · cm

20 - 30 g · cm

0.4 - 2.0 g · cm

More than 40 g · cm

PRECAUTION

1. Specified voltage : 3.0V

2. Switch position

AVLS switch : NORM

CASSETTE SECTION

Test Tape

Tape Speed Adjustmnet

Procedure :

1. PlaybackWS-48A(Tape center part) and adjust RV601 so that

the frequency counter reading becomes 3,000Hz ± 15Hz.

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

Check that frequency counter reading is within 1.5% of the

reading of step1.

Adjustment Point :

[MAIN BOARD] — SIDE B —

Type

WS-48A Signal

3kHz, 0dB Purpose

Tape SpeedAdjustment

Test tape

WS-48A

(3kHz, 0dB)

Set

PHONES jack

–

Frequency counte

RV601 : Tape Speed

16Ω: E, EA, C & SA, PAModels.

32Ω: AEP, IT, E, CND, FR Models.

• Abbreviation

CND : Canadian

IT : Italian

EE : East European

EA : Saudi Arabia

FR : French

PA : Panama

C & SA : Central and South America

WM-FX171/FX173/FX177

— 10 — — 11 — — 12 —

5-2. SCHEMATIC DIAGRAM

(FX171/FX177 MODELS)

Note:

• All capacitors are in µF unless otherwise noted. pF: µµF

50 WV or less are not indicated except for electrolytics

and tantalums.

• All resistors are in Ωand 1/4W or less unless otherwise

specified.

•¢: internal component.

•C: panel designation.

•U: B+ Line.

•H: adjustment for repair.

• Total current is measured with no cassette installed.

• Power voltage is dc 3V and fed with regulated dc power

supply from external power voltage jack.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : PB (TAPE)

( ) : AM

< > : FM

• Voltagesare taken with a VOM (Input impedance 10 MΩ).

Voltage variations may be noted due to normal produc-

tion tolerances.

• Signal path.

F: FM

f: AM

E: PB

• Abbreviation

CND : Canadian model

IT : Italian model

EE : East European model

EA : SaudiArabia model

FR : French model

PA : Panama model

C & SA: Central and SouthAmerica models

10 101010

WM-FX171/FX173/FX177

5-3. PRINTED WIRING BOARD

(FX171/FX177 MODELS)

Ref. No. Location

D120 G-13

IC1 F-14

IC301 E-17

IC601 E-18

Q2 G-14

Q101 E-15

Q201 E-15

Q301 F-16

Q302 F-14

• Semiconductor

Location

— 13 — — 15 — — 16 —

Note:

•X: parts extracted from the component side.

•®: Through hole.

•b: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:

Pattern face side: Partson thepattern face side seen from

(Conductor B) the pattern face are indicated.

Parts face side: Parts on the parts face side seen from

(Component A) the parts face are indicated.

3 4 5 6 7 8 9 1011121314151617181920212223

MAIN BOARD

(SIDE B)

MAIN BOARD

(SIDE A)

1-667-714- 11

(11)

1018

19 15

28 36

(POWER)

HP901

(PLAYBACK HEAD)

(BATT)

RV301

(VOLUME)

FM AM TAPE

(RADIO OFF)

124

1312

2/4

3/4

1/4

4/4

TUNING

L1 EXCEPT C&SA,PA,FX177

MODEL

EXCEPT

C&SA,PA,

FX177

MODEL

C&SA,PA

FX177 MODEL

C&SA,PA,

FX177

MODEL

S305

AVLS

NORM

LIMIT

NORM

CrO

METAL

FM ST

MONO

LOCAL

J302

BLK

ORG

RED

WHT

M901

REEL/CAPSTAN

MOTOR

MEGA BASS UNIT

OFF

DRY BATTERY

SIZE "AA"

(IEC DESIGNATION R6)

2PCS, 3V

J301

DC IN 3V

E,C&SA,EA,PA

MODEL

•Abbreviation

CND : Canadian

IT : Italian

EE : East European

EA : Saudi Arabia

FR : French

PA : Panama

C & SA: Central and South America

— 14 —

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