SONY WMFX855 - Service Manual Immediate Download

RADIO CASSETTE PLAYER

E Model

Tourist Model

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

MT-WMEX655-125

SPECIFICATIONS

SERVICE MANUAL

WM-FX855

Dolby noise reduction manufactured under license from

Dolby Laboratories Licensing Corporation.

" DOLBY " and the double-D symbol

a are trademarks of

Dolby Laboratories Licensing Corporation.

Photo: Black

Continued on next page

Tape player section and general

Frequency response (

aNR switch off)

3018,000 Hz

Output

Headphones (

2 REMOTE jack)

Load impedance 8300 ohms

Power output

3mW + 3mW at DC operation

Power requirements

1.5V DC

Rechargeable battery (NC-6WM), 1.2 V, 600mAh, Ni-Cd One R6

(size AA) battery

Battery life (Approx. hours)

Rechargeable NC-6WM

Fully charged

Playback

Radio/TV reception

Sony alkaline LR6 (WM)

Playback

Radio/TV reception

Sony R6P (SR)

Playback

Radio/TV reception

Rechargeable NC-6WM

Sony alkaline LR6 (WM)

Used together

Playback

Radio/TV reception

Dimensions

Approx. 108.7

× 80.0 × 23.5 mm (w/h/d)

Weight

Approx. 150 g (Main unit)

Approx. 210 g (incl. Headphones with remote control, Recharge-

able battery NC-6WM, Tape (C-60HF)

Radio section

Frequency range

Tourist model

FM : 7690MHz

AM : 5311,710kHz

TV : 112ch (Except Korean model.)

Korean model (Area setting : Eur)

FM : 87.5108MHz

AM : 5311,602kHz

Design and specifications are subject to change without notice.

Ver 1.3 2001.11

9-923-252-12

Sony Corporation

2001K0500-1

Personal Audio Company

2001.11

Published by Sony Engineering Corporation

TABLE OF CONTENTS

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

GENERAL ................................................................... 5

DISASSEMBLY ......................................................... 6

MECHANICAL ADJUSTMENT .......................... 8

ELECTRICAL ADJUSTMENT ............................ 8

DIAGRAMS

6-1. Block Diagram ................................................................ 11

6-2. Printed Wiring Board

AUDIO Section ......................................................... 14

6-3. Schematic Diagram

AUDIO Section ......................................................... 17

6-4. Schematic Diagram

TUNER Section ........................................................ 22

6-5. Printed Wiring Board

TUNER Section ........................................................ 25

6-6. IC Pin Function Description ........................................... 30

EXPLODED VIEWS ................................................ 34

ELECTRICAL PARTS LIST ............................... 37

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

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK

! OR DOTTED

LINE WITH MARK

! ON THE SCHEMATIC DIAGRAMS

AND IN THE PARTS LIST ARE CRITICAL TO SAFE

OPERATION. REPLACE THESE COMPONENTS WITH

SONY PARTS WHOSE PART NUMBERS APPEAR AS

SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

SECTION 1

SERVICE NOTE

Service Mode

Mode for operating the mechanism section with the AUDIO board

opened.

1. Setting

1) Refer to "Disassembly", and remove the cabinet and open the

AUDIO board.

2) Connect the motor and plunger to the AUDIO board using

jumper wires. These can be connected easily with the use of

the extension tool (1-769-143-11) (ten in one set).

3) Turn ON the HOLDER switch (S706).

4) Input the square wave or sine wave to PH701. (See right fig-

ure.)

5) Supply 1.5 V to the

` and ' terminals of the battery using a

regulated power supply.

2. Preset state

To set the PLAY, FF, REW modes, the preset state must be set.

1) Check that the lever (FR SW) and FWD/RVS switch (S708)

are set to the center position. If not, set the preset state as fol-

lows.

2) Move the FWD/RVS switch (S708) to the side which the lever

(FR SW) is facing.

3) The lever (FR SW) will move when the regulated power sup-

ply switch is set to OFF once and then set to ON. Move the

FWD/RVS switch (S708) according to this timing and set to

the center position.

3. FF, REW Modes

1) Check that the preset state is set and press the FF and REW

switches.

4. PLAY mode

1) Check that the preset state is set.

2) Pressing the

ª · switch will move the lever (FR SW) once

towards the F side and then to the R side. Moving the FWD/

RVS switch (S708) according to this timing will set the PLAY

mode (R side). Pressing the

ª · switch another time and

moving the FWD/RVS switch (S708) according to the move-

ment of the lever (FR SW) will set the PLAY ( F side) mode.

Note 1: If the above fails, perform from preset again.

Note 2: Use the

ª ·, , FF, REW switches on the remote

commander as much as possible. If no remote commander,

do not touch the switches with your hands, but using a

stick with a round tip.

Note 3: When using headphones, the timing for moving the S708

can be determined from the beep sound.

Audio Board

-- Side A

Battery terminal (--)

Connect to motor

Connect to plunger

CN501

IC501

IC301

Battery

terminal (+)

-- Side B --

S708

FWD/RVS Switch

(FWD

STOP RVS)

S706

(HOLDER Switch)

side F

side R

Center

IC701

PH701

AF OSCILLATOR

Sguare wave

(Sine wave)

10 Hz --3.5 dB

lever (FR SW)

side F

side R

center

Lever (FR SW)

Rotation system

Rotation system during PLAY.

gear (REEL)

(T side)

gear (TB)

gear (S)

clutch ass'y (M)

gear (Y)

gear (TA)

pulley (reverse)

flywheel (R) ass'y

flywheel (N) ass'y

gear (REEL)

(S side)

motor pulley

gear (NR)

(REW: right side/

FWD: left side)

Rotation system during FF.

gear (TB)

gear (FR)

(FF: left side)

gear (NR)

clutch ass'y (M)

motor pulley

pulley (reverse)

flywheel (R) ass'y

flywheel (N) ass'y

gear (Y)

gear (REEL)

(T side)

Rotation system during REW.

gear (NR)

gear (FR)

(REW: right side)

gear (REEL)

(S side)

gear (S)

motor pulley

clutch ass'y (M)

pulley (reverse)

flywheel (R) ass'y

flywheel (N) ass'y

gear (Y)

SECTION 2

GENERAL

LOCATION AND FUNCTION OF CONTROLS

Tape player section and general

· Main Unit

Radio section

· Main Unit

· Headphones with Remote Control

Left Right

· Headphones with Remote Control

Left Right

1 OPEN button

2 Information display

3 Contact for dry battery case

4 Rechargeable battery case

5 Tape operation buttons

6 BATT indicator

7 HOLD switch

8 Main unit : VOLUME knob

Remote control : VOL knob

9 Åa (Tape direction),

BL SKIP (Blank skip) switch

!º a(DOLBY) NR switch

!¡ 2 REMOTE jack

!TM Micro plug

!£ SOUND/AVLS button

1 ENTER button

2 ASP (Auto Station Preset) button

3 PRESET +, button

4 TUNE +, button

5 p, RADIO OFF button

6 FM ST/MONO switch

7 BAND, RADIO ON button