Sony WM-FX141 User manual

WM-FX141

US Model

AEP Model

E Model

SERVICE MANUAL

RADIO CASSETTE PLAYER

MICROFILM

Model Name Using Similar Mechanism WM-FX101

Tape Transport Mechanism Type MF-WMFX103-48

SPECIFICATIONS

Radio Frequency

FM : 87.6 – 108 MHz (US, Chilean, LatinAmerica, Central and

South America Models)

: 65.0 – 107.9MHz (East European Model)

: 87.6 – 107.9 MHz (Other Models)

AM : 530 – 1,710 kHz (US, Chilean, LatinAmerica, Central and

South America Models)

: 531 – 1,602kHz (Other Models)

Power requirements

3V DC batteries R6 (size AA) ×2

External DC 3V power sources

Battery life

(Aprroximate hours)

Battery Playback Radio

Sony alkaline LR6 (SG) 16 hrs 48 hrs

Sony R6P (SR) 4.5 hrs 16 hrs

Dimensions

93.9 ×118.5 ×35.9 mm (w/h/d)

(33/4×43/4×13/16 in.) incl. projecting parts

Mass

205g (7.3 oz) incl.batteries

Supplied accessories

•Stereo headphones or earphones (1)

•Belt clip (1)

Design and specifications are subject to change without notice.

Ver 1.3 1999. 05

With SUPPLEMENT-1 (9-923-296-81)

With SUPPLEMENT-2 (9-923-296-82)

— 2 —

TABLE OF CONTENTS

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

2. DISASSEMBLY

2-1. Cabinet (Rear) ································································· 4

2-2. Mechanism Deck and Main Board ································· 4

2-3. Main Board ····································································· 5

2-4. Cassette Lid·····································································5

2-5. Dial Pointer Setting························································· 5

3. ADJUSTMENT

3-1. Mechanical Adjustment ·················································· 6

3-2. Electrical Adjustment······················································ 6

4. DIAGRAMS

4-1. Block Diagram ································································ 9

4-2. Schematic Diagram ······················································· 11

4-3. Printed Wiring Board ···················································· 13

4-4. IC Block Diagram ························································· 17

5. EXPLODED VIEWS

5-1. Cabinet and Board Section ··········································· 18

5-2. Mechanism Section (MF-WMFX103-48) ···················· 19

6. ELECTRICAL PARTS LIST ······································· 20

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.

Flexible Circuit Board Repairing

• Keep the temperature of 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.

— 3 —

SECTION 1

GENERAL This section is extracted

from instruction manual.

— 4 —

SECTION 2

DISASSEMBLY

2-1. CABINET (REAR)

2-2. MECHANISM DECK AND MAIN BOARD

Remove the mechanism deck

and main board in the

direction of the arrow.

head flexible board

mechanism dec

and MAIN board

note for installation :

Make sure to put the head flexible

board to ditch before install the

mechanism deck and MAIN board.

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

Note : Disassemble the unit in the order as shown below.

Cabinet (Rear) Mechanism deck and main board Main board

Cassette lid

Dial pointer setting

Cassette lid

Cabinet(rear)

Open the cassette lid and release claw

Remove the cabinet(rear).(Release

all claws

from

in alphabetical order.)

— 5 —

2-3. MAIN BOARD

head flexible board

MAIN boar

claws

2-4. CASSETTE LID

Front cabine

Cassette lid

(Remove it in the

direction of the arrow)

Release the catch

Align pointer with arrow

marked side as shown in Fig.1

and then fit to groove in the

order of

and

Align

Pointe

Fig. 1

Pointer

Rotate tune knob fully to arrow direction.

A



B



2-5. DIAL POINTER SETTING

— 6 —

SECTION 3

ADJUSTMENTS

3-1. MECHANICAL ADJUSTMENTS

Precaution

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

swab :

playback head pinch roller

capstan rubber belts

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 adjustmentsshould be perfomedwith the ratedpower supply

voltage (2.5V) unless otherwise noted.

Torque Measurement

3-2. ELECTRICAL ADJUSTMENTS

Precaution

•Supplied voltage : 2.5V

•Switch and control position

TAPE switch : NORM

VOLUME control : maximum

AVLS switch : OFF

Mode Torque meter Meter reading

FWD

Back Tension

FF, REW

CQ-102C

CQ-201B

20 to 42 g•cm

(0.28 to 0.58 oz•inch)

less than 2 g•cm

(less than 0.03 oz•inch)

more than 60 g•cm

(more than 0.83 oz•inch)

TAPE SECTION

•FUNCTION switch : TAPE

Test tape

Type Signal Used for

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

Tape speed adjustment

Tape selection adjustment : NORM

Procedure :

Adjustment Value: normal tape speed

Adjustthe tape speedadjustment RV601,sothatthe freqencycounter

reading becomes 3,000Hz.

Specification Value:

Frequency difference between the beginning and the end of the tape

should be within 1.5% (45Hz).

Adjustment Location :

0dB=0.775V

Digital frequency counter

2,945 to 3,015Hz

set

Ω

J302(phones)

frequency

counter

test tape

WS-48A

(3kHz, 0dB)

— 7 —

[AM]

BAND: AM

Signal generator

[FM]

BAND : FM

Signal generator

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 620kHz(800kHz)

CT1 1,400kHz(1,300kHz)

TUNER SECTION

Put the lead-wire

antenna close to

the set.

30% amplitude modulation by 400Hz

signal.

Output level : as low as possible

AM RF signal

generator

0.01

FM RF signal

generator

antenna termina

75kHz(100%) amplitude modulation

by 1kHz signal.

Output level: as low as possible

Ω

set

level mete

J302 (phones)

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 505kHz(516.5kHz)

CT4 1,750kHz(1,631.5kHz)

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1 455kHz

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 86.0MHz[64MHz]

CT2 109.5MHz

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 86.0MHz[64MHz]

CT3 109.5MHz

( ) :E, Mexican, East European,AEP

[ ] : East European

Adjustment Location: Main board (See page 8)

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

maximum level meter indication.

• The frequency coverage and tracking adjustments should be

finally done by the trimmer capacitors.

— 8 —

AdjustmentLocation:Mainboard

CT1

AM Tracking

Adjustment

CT2

FM Tracking

Adjustment

FM Tracking

Adjustment

AM Tracking

Adjustment

FM Frequency

coverage

Adjustment

CT3

FM Frequency

coverage

Adjustment L4

AM Frequency

coverage Adjustment

CT4

AM Frequency

coverage

Adjustment

AM IF

Adjustment

antenna terminal

WM-FX141

— 9 — — 10 —

4-1. BLOCK DIAGRAM

SECTION 4

DIAGRAM

IC301

JC2

3 8

19 18

15 12 6

AM IF

CF1

CF2

425 RV301

VOLUME

HP901

E,MX,EE,AEP

MODEL

PLAYBACK

HEAD

M901

REEL/CAPSTAN

MOTOR

↓

OFF

14L OUT

13R OUT

FM MIX

AM MIX

AM OSC

FM OSC

FM RF OUT

AM RF IN

FM RF IN

AUDIO AMP

MOTOR DRIVE

IC1

FM/AM,RF/AF AMP

E,MX,EE,AEP MODEL

J302

J301

• Signal path

• Abbreviation

EE : East European model

MX : Mexican model

DC IN 3V

Q301

PHONES

SWITCH

S305

AVLS

S302

POWER

S303(2/2)

LPF CP1

DX → LOCAL

23 22 20

RV601

TAPE SPEED

–

S303(1/2)

(TAPE SEL)

CrO2/METAL ← NORM

S304

(FUNCTION)

FM → AM → TAPE

VCO

AM IF IN

FM IF IN

VCC2 16

LP2

19kHz 10.7MHz

TRACKING CT2

CV2

QUAD

DET OUT MPX IN

FREQ.

COVER CT3

CV3

FREQ.

COVER

CT4

CV4

TRACKING CT1

CV1

VCC1

: FM

: AM

E: PB

WM-FX141

4-2. SCHEMATIC DIAGRAM — MAIN SECTION —

— 11 — — 12 —

•Waveform

1IC1 !∞

1.5 Vp-p

19kHz

1µsec/div

0.5V/div

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.

•U: B+ Line.

•H: adjustment for repair.

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

supply from external power voltage jack (J301) .

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : FM

( ) : PB

• Voltages aretakenwithaVOM(Inputimpedance10MΩ).

Voltage variations may be noted due to normal produc-

tion tolerances.

• Waveforms are taken with a oscilloscope.

• Signal path.

F: FM

f: AM

E: PB

• Abbreviation

EE : East European model

5E : Chilean model

6E : Latin America model

8E : Central and South America model

MX : Mexican model

THP602 2k 1000PPM

JR5

JR1

C18

C19

R602

R601

R603

R201

R202

R102

R101

US,5E,6E,8E

E,MX,AEP

1PF

3PF

6PF

9PF

33PF

0.0022uF/100v

C18,C19

0.018uF

0.012uF

18PF

6PF

22PF

8PF

R101,R201

R102,R202

180k

39k

180k

R601

3.9

1.5

R602

5.6

2.2

R603

750

680

J302

M901

(REEL/CAPSTAN)

US,5E,6E,8E

MODEL

JC6

LOCAL

E,MX,EE,AEP MODEL

S303(2/2)

AM FERRITE-ROD ANTENNA

JC2

JC3

LPF

C16 0.022

CP1

↓

→→ →→

↑

AM IF

2.8

1.5

0.8 2

10.7

MHz

TRACKING

L1,CT1

TUNING

CV1-4

FM TRACKING

L2,CT2

FM FREQ. COVER

L3,CT3 AM FREQ. COVER

L4,CT4

AEP,E,MX,EE

MODEL

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