Sony Sports Walkman WM-FS473 Manuale utente

Ver 1.0 1998. 05

MICROFILM

WM-FS473

SERVICE MANUAL

SPECIFICATIONS

US Model

Canadian Model

AEP Model

E Model

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MF-WMFS473

Frequency range FM : 87.5 – 108 MHz

AM : 530 – 1710kHz

(US, Canadian model)

531 – 1602kHz (AEP, E model)

Power requirements 3V DC batteries (AA) R6 x2

Dimensions 104.2 x 127.3 x 51.8 mm (4 1/8 x 51/8x 21/8 inches)

(w/h/d) incl. projecting parts and controls

Mass Approx. 260g (9.2 oz)

Approx.340g (12 oz) incl. batteries and a cassette

Supplied accessory Stereo headphones or Stereo earphones (1)

Design and specifications are subject to change without notice.

RADIO CASSETTE PLAYER

– 2 –

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

damaged by heat.

TABLE OF CONTENTS

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

1. GENERAL

Location of parts and controls............................................ 2

2. SERVICE NOTE........................................................... 3

3. DISASSEMBLY

3-1. Cover Removal ........................................................... 4

3-2. Display Board Removal ............................................. 4

3-3. Cassette Lid Assy Removal ........................................ 5

3-4. Chassis section, Headphone Jack Board Removal ..... 5

3-5. Mechanism Deck, Main Board, Belt Removal........... 6

4. ADJUSTMENTS

4-1. Mechanical Adjustments ............................................ 7

4-2. Electrical Adjustments ................................................ 7

5. DIAGRAMS

5-1. Explanation of IC Terminals..................................... 10

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

5-3. Printed Wiring Boards (Main Section) ..................... 13

5-4. Schematic Diagram (Main Section) ......................... 15

5-5. Schematic Diagram (Display Section) ..................... 18

5-6. Printed Wiring Boards (Display Section) ................. 21

6. EXPLODEDVIEWS

6-1. Cassette Lid Section ................................................. 23

6-2. Main Board Section .................................................. 24

6-3. Mechanism Deck Section (MF-WMFS473) ............ 25

7. ELECTRICAL PARTS LIST................................... 26

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 3 –

SECTION 2

SERVICE NOTE

WATERPROOFED SECTION

Set the Apositions to corner.

then push down to grove.

Note : In case the parts in the figure are removed for repair, treat them to protect from water drop following the instructions in the figure

(spread grease, bond etc.)

• Sony grease SGL-601 : 7-651-000-10

Note : Clean the attachement portion

and shaded area with cloth.

Paking (cabinet)

Cassette lid assy

Screw

Joint (VOL. B)

O ring

(Apply sony grease SGL-601)

Knob (VOL)

Cabinet (rear) assy

– 4 –

SECTION 3

DISASSEMBLY

Note:Followthedisassemblyprocedureinthenumericalordergiven.

3-1. COVER REMOVAL

3-2. DISPLAY BOARD REMOVAL

Theequipmentcanberemo vedusingthef ollo wingpr ocedure .

Cassette lid assy

Screws

Flexible board

Display board

Cassette lid assy

Arm ass

Backle

Cover

Screws

Claws

Chassis section, Headphone jack board

Cover

Set Diaplay board

Cassette lid assy Mechanism deck, Main board, Belt

– 5 –

3-3. CASSETTE LID ASSY REMOVAL

3-4. CHASSIS SECTION, HEADPHONE JACK BOARD REMOVAL

Screws (+P 2x12)

Headphone jack board

Chassis section

Cabinet (rear) assy

Knob (VOL)

RV301

Main board

Claws

Cassette lid assy

Screw

Flexible board

Note:Wheninstallthec hassissection

1. TurnR V301full ytoarr owdirection.

2. Turnknob(V OL)fullytoarr owdirection.

3. FitRV301toholeofknob(V OL)andthen

installthechassissection.

– 6 –

3-5. MECHANISM DECK, MAIN BOARD, BELT REMOVAL

Main board

Screws (2x5)

Chassis

Claw

Screw

Claw

Belt Mechanism dec

Red

Remove

solder

Black

Orange

Gray

Black

White

– 7 –

SECTION 4

ADJUSTMENTS

4-2. ELECTRICAL ADJUSTMENTS

PRECAUTION

• Suppliedv olta ge: 2.5V.

• Switchandcontrolposition

SETswitch:NORM

VOLUMEcontrol:maximum

MENUswitch:NORM

TestTape

Type Signal Used for

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

Tape SpeedAdjustment

Procedure :

1. Pla ybac kWS-48A(tapecenterpar t)intheREVstateandadjust

RV601so thatthefrequenc ycounterreadingbecomes2,990Hz

–3,010Hz.

2. Pla ybac kWS-48A(tapecenter)intheFWDstate .

Checkthatfrequencycounterreadingiswithin1.5%oftheread-

ingofstep1.

Adjustment Location :

set

test tape

WS-48A

(3kHz, 0dB) frequency counte

J101 (phones)

Ω

4-1. MECHANICAL ADJUSTMENTS

PRECAUTION

1. Cleanthefollowingpartswithadenatured-alcohol-moistened

swab: playbackhead pinchroller

capstan rubberbelt

2. Dema gnetiz ethepla ybac kheadwithaheaddema gnetiz er.

3. Donotuseamagnetizedscrewdriverfortheadjustments.

4. Aftertheadjustments,applysuitablelockingcompoundtothe

partsadjusted.

5. Theadjustmentsshouldbeperformedwiththeratedpowersup-

plyvolta ge(2.5 V)unlessotherwisenoted.

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 0.03 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 60 g • cm

(more than 0.83 oz• inch)

RV601

– 8 –

TUNER SECTION

AM Section

BAND : AM

FM Section

BAND: FM

* Repeattheproceduresineachadjustmentseveraltimes,andthe

frequencycoverageandtrackingadjustmentsshouldbefinally

donebythetrimmercapacitors.

Frequency CoverageAdjustment

Setting :

nomark : COM

< > :AEP,Emodelonl y

AM IF ALIGNMENT

Adjust for a maximum reading on level meter.

T1 450kHz

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust part Frequency display Reading on digital

voltmeter.

T2 530kHz 1.25 – 1.35V

< 531kHz>

Confirmation 1,710kHz less than 10V

AMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 620kHz < 621kHz>

CT1 1,400kHz< 1,395kHz>

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust part Frequency display Reading on digital

voltmeter.

L3 87.5MHz 3.7 – 3.9V

Confirmation 108MHz less than 10V

FMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L2 87.5MHz

Confirmation 108MHz

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.

FM RF signal

generator

75kHz frequency deviation by

400Hz signal.

Output level : as low as possible

TP27 (ANT IN

)

(GND)

0.01

set

Ω

J101 (phones)

level mete

digital voltmeter

(DC range)

TP19 (VT)

(GND)

[MAIN BOARD] (Conductor side)

– 9 –

Adjustment Location :

L1 : AM Tracking Adjustment CT1 : AM Tracking Adjustment

L2 : FM Tracking Adjustment

T2 : AM Frequency Coverage Adjustment

L3 : FM Frequency Coverage Adjustmen

T1 : AM IF Alignment

[MAIN BOARD] (Conductor Side)

Connection Point :

[MAIN BOARD] (Component side)

– 10 –

Pin No. Pin name I/O Description

1 – 3 COM1 – COM3 O Common output terminal.

4 – 20 S1 – S17 O Segment output terminal.

21 – 26 KR0 – KR5 O Key return timing output terminal.

27 – 30 K0 – K3 I Key input.

31 – 36 T0 – T5 O Key return timing output.

37 NOM/METAL O Tape normal/metal selection output.

38 TAPE ON I Tape power (MD power) ON Det terminal.

39 LOCAL/DX O Local/DX selection output.

40 MEGA BASS O Mega bass ON/OFF control output.

41 MONO/ST O Mono/Stereo selection output.

42 BAND O FM/AM band selection output.

43 I Power initial terminal.

44 TAPE & RADIO O Tape & Radio +B ON/OFF control.

45 AVLS O AVLS control terminal.

46 BEEP O Beep signal output terminal.

47 MUTE ON O Mute signal output terminal. H : Mute ON

48 TEST I Test terminal (Connected to ground).

–––––––––––––

49 HOLD I Hold detection terminal.

50 IF IN I IF input terminal.

51 RADIO ON O Radio +B ON/OFF control.

52 DO O PLL error signal output.

53 GND – Ground.

54 FM IN I FM local oscillator input terminal.

55 AM IN I AM local oscillator input terminal.

56 VDD – Power supply terminal (+2.8V).

––––––––––––––

57 RESET I System reset terminal. L : Reset

58 X OUT O Crystal oscillator terminal (75kHz).

59 X IN I Crystal oscillator terminal (75kHz).

60 VXT – Terminal to which external capacitor for stabilization of crystal oscillator power supply is

connected.

61 VLCD – LCD drive power supply set-up terminal.

62 C1 – LCD drive power supply set-up terminal.

63 C2 – LCD drive power supply set-up terminal.

64 VEE – 1.5V constant voltage power supply terminal for LCD drive.

SECTION 5

DIAGRAMS

5-1. EXPLANATION OF ICTERMINALS

IC701 TC9322FB-603 (LCD DRIVE/SYSTEM CONTROL)

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