Sony MW-FX277 Bedienungsanleitung

Ver 1.0 2000.03

WM-FX277/FX467/FX467ST

RADIO CASSETTE PLAYER

SPECIFICATIONS

US Model

Model Name Using NEW

Mechanism Type

Similar Mechanism WM-FX277 : MF-WMFX277-114

Tape Transport WM-FX467/FX467ST : MF-WMFX467-114

Photo :WM-FX467

SERVICE MANUAL

• Frequency range

FM: 87.5 - 108 MHz

AM: 530 - 1,710 kHz

TV: 2 - 13 ch

• Power requirements

3V DC batteries R6 (AA) x2

• Dimensions (w/h/d)

Approx. 91.4 x115.5 x35.0 mm (3 5⁄8x4 5⁄8x1 7⁄16 inches)

incl. projecting parts and controls

• Mass

FX467/FX467ST: Approx. 155 g (5.5 oz)/Approx. 235 g (8.3 oz) incl.

batteries and a cassette

FX277: Approx. 145 g (5.2 oz)/Approx. 225 g (8.0 oz) incl. batteries

and a cassette

• Supplied accessories

Stereo headphones or Stereo earphones (1)

Carrying case with belt clip(1)

Design and specifications are subject to change without notice.

Battery life (approximate hours) (EIAJ*)

Sony alkaline LR6 (SG) Sony R6P (SR)

Tape playback 25 7.5

Radio reception 40 14

* Measured value by the standard of EIAJ (Electronic Industries

Association of Japan). (Using a Sony HF series cassette tape)

Note

• The battery life may shorten depending on the operation of the unit.

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– 2 –

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

1. GENERAL

Location and Function of Controls .................................... 2

2. DISASSEMBLY

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

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

2-3. Mechanism Deck ........................................................ 4

2-4. Belt, Capstan/Reel Motor (M601) .............................. 4

2-5. Cassette Holder........................................................... 5

3. ADJUSTMENTS

3-1. Mechanical Adjustments............................................. 6

3-2. Electrical Adjustments ................................................ 6

4. DIAGRAMS

4-1. Explanation of IC Terminals....................................... 9

4-2. Block Diagram.......................................................... 10

4-3. Printed Wiring Boards .............................................. 13

4-4. Schematic Diagram................................................... 17

5. EXPLODED VIEWS

5-1. Cabinet Section......................................................... 21

5-2. Mechanism Deck Section (WM-FX277).................. 22

5-3. Mechanism Deck Section

(WM-FX467/FX467ST) ........................................... 23

6. ELECTRICAL PARTS LIST................................... 24

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

SECTION 1

GENERAL

LOCATION AND FUNCTION OF CONTROLS

This section is extracted from

instruction manual.

HOLD

OFF

TUNING + / -

ENTER

MEGA BASS

NORM •CrO2 / METAL

DX •LOCAL

AVLS

NORM •LIMIT

VOLUME

xSTOP

NPLAY

DIR •Y

(FX467 / FX467ST only)

MODE •s/ d

(FX467 / FX467ST only)

PRESET+ FX467/FX467ST

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SECTION 2

DISASSEMBLY

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

2-1. CABINET (FRONT)

2-2. MAIN BOARD

zThe equipment can be removed using the following procedure.

Main boardCabinet (Front)

Cassette holder

Mechanism deck Belt, Capstan/reel motor (M601)

Set

Cabinet (Front)

Cabinet (center) sub ASS

Cassette holder

4Claw

1Claws

3Claws

1Claws

Main board

1Screw

Orange

Black

White

Red

Cabinet (center) sub ASS

Head flexible board

2Remove solder

3Claws 4

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2-3. MECHANISM DECK

2-4. BELT, CAPSTAN/REEL MOTOR (M601)

Mechanism deck

Cabinet (center) sub ASS

1Claws

2Belt

Stopper

1Claw

4Capstan/reel motor

(M601)

wheel ASSY (P), capstan

(FX467/FX467ST)

wheel ASSY (P), capstan

Belt

• How to apply the beltCapstan/reel motor

(M601)

3Screws (M1.4)

Mechanism deck

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Cassette holder

4Spring (torsion)

Hinge

Cabinet (center)

sub ASSY

Hinge

Projection

Projection 3Move the hinge away

from projection

2Move the hinge away

from projection

Spring (torsion)

Hinge

Cassette holde

Cabinet (center) sub ASSY

124

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.

2-5. CASSETTE HOLDER

zCAUTIONS DURING ASSEMBLY

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–6 –

SECTION 3

ADJUSTMENTS

3-2. ELECTRICAL ADJUSTMENTS

PRECAUTION

•Supplied voltage : 2.5V.

•Switch and control position

MEGA BASS : OFF

VOLUME control : maximum

AVLS : NORM

TAPE SECTION

TestTape

Type Signal Used for

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

Tape Speed Adjustment

Procedure:

(FX277)

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.

(FX467/FX467ST)

1. Playback WS-48A (tape center part) in the FWD state and ad-

just RV601 so that the frequency counter reading becomes

3,000Hz.

Standard value : 2,985–3,015Hz

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

Check that frequency counter reading is within ±1.0% of the

reading of step 1.

AdjustmentLocation:

0 dB = 0.775V

set

test tape

WS-48A

(3kHz, 0dB) frequency counte

32 Ω

phones jack (J301)

3-1. 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 20 –42 g •cm

CQ-102C (0.28 –0.58 oz•inch)

FWD less than 2 g •cm

back tension (less than 0.027 oz•inch)

REV 20 –42 g •cm

(FX467/FX467ST) (0.28 –0.58 oz•inch)

REV CQ-102RC less than 2 g •cm

back tension (less than 0.027 oz•inch)

(FX467/FX467ST)

FF, REW CQ-201B more than 60 g •cm

(more than 0.84 oz•inch)

RV601 : Tape speed Adjustmen

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–7 –

TUNER SECTION

AM Section

BAND : AM

TV/FM Section

BAND : TV or FM

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

RV2 450kHz

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust parts Frequency display Reading on digtal

voltmeter

Confirmation 530kHz Standard value : 3V or less

L7 1,710kHz Adjustment value : 10.0V

Standard value : 9.9-10.1V

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 620kHz

CT1 1,400kHz

TV and FM FREQUENCY COVERAGE CONFIRMATION

Frequency display Reading on digtal voltmeter

Confirmation 2CH (TV) Standard value : 1.6 - 2.2V

Confirmation 108MHz (FM) Standard value : 11.0V or less

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 98MHz

Confirmation 108MHz

TV TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L5 2CH

Confirmation 13CH

AdjustmentLocation: Mainboard (See page8)

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

32 Ω

phones jack (J301)

level meter

R205

R105

C35

C310

C312

C39

C40

TUNER

GND

(FM/TV IN)

(L)

STID

S304

S303

-2 -1

FM RF signal

generator

22.5kHz frequency deviation

by 400Hz signal.

Output level :

as low as possible

(FM/TV IN) 0.01µF

[MAIN BOARD]

(Side B)

Frequency Coverage Adjustment

Setting:

D401

D402

C401

C403

C405

C406

401

R402

R403

R19

C402

C404

T401

GND

(VT)

TP (VT)

TP (GND)

[MAIN BOARD]

(Side B)

digital voltmete

(DC range)

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–8 –

AdjustmentLocation:

IC1

[MAIN BOARD] (SIDE A)

RV1 : FM VCO Adjustment

L7 : AM Frequency Coverage Adjustment

RV2 : AM IF Adjustment

L4 : FM Tracking Adjustmen

L5 : TV Tracking Adjustment

L3 : AM Tracking Adjustment

CT1 : AM Tracking Adjustment

FMVCO Adjustment

Procedure:

C35

C310

C312

C39 C40

(FM/TV IN)

(L)

STID

S304

S303

-2 -1

FM RF signal

generator

Carrier frequency : 98MHz

Modulation : No modulation

Output level : 0.1V (100dB/ µV)

(FM/TV IN) 0.01µF

[MAIN BOARD]

(Side B)

1. Connect the frequency counter as shown in the figure.

2. Turn the set to 98MHz.

3. Adjust RV1 for 76kHz reading frequency counter.

Standar value : 75.8 - 76.2kHz

C25

RV1

C11

C15

C10

C19

R15

C20

C21

C26

C28

C31

C34

IC1

R20

40 31

11 15

frequency counter

33K Ω

1 F

IC1 7pin

IC1 0pin +

[MAIN BOARD] (Side A)

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– 9 – – 10 – – 12 –– 11 –

4-2. BLOCK DIAGRAM

• Signal path.

F: FM, TV

f: AM

E: PB

WM-FX277/FX467/FX467ST

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 I Comparator input.

17 N/R SW I N/R switch input.

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 input.

57 AM IN I AM input.

58 VSS – Ground terminal.

59 E.O O Error 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).

SECTION 4

DIAGRAMS

4-1. EXPLANATION OF ICTERMINALS

IC702 LC72348W-CFX1705 SYSTEM CONTROL

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S701

HOLD

OFF

PRESET

S710

S711

S712

AM OFF

S708

ENTER

MEGABASS

FB101

FB201

FB301

R18

R205

R105

R11

C107 C207

C24

C29

D703

D401

D402

Q401

C401

C403

C405

C406

R401

R403

R19

C35

C311

C310

C39

R107

R207

C402

C40

JR1

JR2

C712

RV301

RV601

(TAPE SPEED)

C16

C12

C17

C404

C303

C308

C305

C502

C104

C204

T401

PB3

(R)

GND

(L)

MEGA

MIX IN

GND

TAPE

PRE

GND

VREF

PA1

BASS

PB1

TUNE

COMP

PRE

CTL

TUNER GND

(R)

PA2

PWIN

(L)

MIX OUT

(FM/TV IN)

PWIN

(R)

VREF

(L)

MIX OUT

PWOUT

PWOUT (R)

(L)

STID

(COM)

PWOUT

GND GND

PA3

TUNER

VCC

AMP ON

PA0

PB2

VDD

MUTE

VCC

L-CH

R-CH

L-CH

R-CH

HP601

PLAYBACK HEAD

BCE

AVLS

S304 S304

S303 S303

-2 -1

CrO2/METAL

NORM

LIMIT

NORM

FERRITE-ROD

ANTENNA

ND701

LIQUID CRYSTAL

DISPLAY PANEL

ORG

BLK

WHT

RED

WVU

COM M

M601

CAPSTAN/REEL

MOTOR

(11)

FX277 : 1-677-908-

FX467/467ST : 1-677-907- FX277 : 1-677-908-

FX467/467ST : 1-677-907-

DRY BATTERY

SIZE "AA"

(IEC DESIGNATION R6)

2PCS, 3V

[MAIN BOARD] (SIDE B)

PRE

GND

L-CH

R-CH

C30

PRESET

–

LOCAL

23 4 5 6 7 89 10 11 12 13 14 15 16 17 18 19 20

L-CH

R-CH

L-CH

FWD

REV

HP601

PLAYBACK

HEAD

[HEAD FLEXIBLE BOARD]

FX277

FX467/FX467ST

ECB

Q701

R702

R501

Q502

R504

R503

R502

Q501

C501

C702

C704

C705

C707

C708

C709

C710

C711

R718

R720

R717

L702

R605

R606

R607

R304

R710

R106

R206

C703

17 20 25 30

R711

R712

R713

R714

R715

R716

IC701

C701

R704

R705

R706

R707

C309

R303

C106

C206

R701

R708

C603

R201

R202

R203

R101

R102

R103

R104

R601

R603

C101

C201

C302

C304

C105

C205 Q301

R305

C604

C605

C606

C607

R604

C306

C108

C208

CT1

C22

C301

R301

R10

R13 R14

R16

C27

C25

C32 C33

RV1 RV2

C11

C13

C14

C15

C10

C18

C19

R15

C20

C21

C23

C26

C28

C31

C34

TH601

X701

IC702

IC301

IC1

L401

R17

R302

C307

R204

FB302

R722

C714

R703

R12

R721

C203

C103

C602

C601

R602

S301

(TAPE ON)

R20

C715

213

1510

40 31

11 15

[MAIN BOARD] (SIDE A)

(11)

FX277

FX467/FX467ST

R202

R203

R101

R103

R104

R601

C101

C102

C201

C202

R204

C203

C103

J301

RV301

VOLUME

S709

S705

TUNING–

S702

TUNING+

(VT)

S703

S706

S704

C503

BE C

S302

(N/R SW)

FX467/FX467ST

– 15 – – 16 –– 13 – – 14 –

WM-FX277/FX467/FX467ST

D1 F-2

D2 C-18

D3 D-18

D4 D-18

D401 B-6

D402 B-5

D703 B-10

IC1 C-18

IC301 E-14

IC701 E-15

IC702 D-15

Q3 D-18

Q301 F-14

Q401 B-5

Q501 C-13

Q502 B-13

Q701 B-13

Ref. No. Location

zSemiconductor

Location

4-3. PRINTED WIRING BOARDS

Note:

•X: parts extracted from the component side.

•a:Through hole.

•f: internal component.

•b: Pattern of the rear side.

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