Sony WMFX-673, WMFX-877 Service manual

WM-FX673/FX877

SERVICE MANUAL

Ver 1.0 1999. 03

Photo: WM-FX673

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.

SPECIFICATIONS

Canadian Model

AEP Model

UK Model

Australian Model

WM-FX673

E Model

WM-FX673/FX877

Chinese Model

Tourist Model

WM-FX877

Model Name Using Similar Mechanism WM-EX670/EX672 Tape Transport Mechanism Type MT-WMEX672-162

MICROFILM

RADIO CASSETTE PLAYER

1. SERVICING NOTES ............................................... 3

2. GENERAL ................................................................... 5

3. DISASSEMBLY ......................................................... 7

4. MECHANICAL ADJUSTMENTS....................... 12

5. ELECTRICAL ADJUSTMENTS......................... 12

6. DIAGRAMS

6-1. Block Diagram – TUNER Section – ............................. 15

6-2. Block Diagram – MAIN Section – ................................. 17

6-3. Printed Wiring Board ...................................................... 19

6-4. Schematic Diagram ......................................................... 23

6-5. IC Pin Function Description ........................................... 30

7. EXPLODED VIEWS ................................................ 32

8. ELECTRICAL PARTS LIST ............................... 34

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.

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 PUBLISHED BY SONY.

ATTENTION AU COMPOSANT AYANT RAPPORT

LES COMPOSANTS IDENTIFIÉS P AR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

À LA SÉCURITÉ!

– 2 –

SECTION 1

SERVICING NOTES

This set detects the rotation of the idler gear (A) (side S) using the PH1 (photo reflector). The PH1 is mounted on the MAIN board, therefore the idler gear (A) (side S) cannot be detected with the MAIN board removed. As a result, the motor (M601) cannot be controlled, causing malfunction. Further, the DIRECTION switch (S1) is also mounted on the MAIN board, and with the board removed, the mechanism position cannot be detected and the operation is not changed over. Therefor, when the voltage check is e xecuted with the MAIN board removed, follow the procedure provided below.

1. Setting (1) Refer to “3. DISASSEMBLY”, and remove the MAIN board . (2) Connect the MAIN board to the motor (M601) and the

plunger (PM901) using jumper wires. These can be connected easily with the use of the extension tool (Part No. 1-769143-11) (ten in one set).

(3) Short the TAPE DETECT switch (S901-1) terminals and the

ATS switch (S901-2) terminals.

(4) Connect the AF oscillator to the Q15-1 (COLLECTOR) and

the TP23 (GND).

(5) Supply 1.3 V to the battery terminals using the regulated

power supply.

2. Preset state T o set the PLAY , FF, REW modes, the preset state must be set.

(1) Check that the slider (NR) and the DIRECTION switch (S1)

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

(2) Move the DIRECTION switch (S1) to the side, which the

slider (NR) is facing.

(3) The slider (NR) will move when the regulated power supply

switch is set to OFF once and then set to ON. Move the DIRECTION switch (S1) according to this timing and set to the center position.

3. FF, REW modes (1) Check that the preset state is set. (2) Input the square wave or sine wave to the Q15-1 (COLLEC-

TOR) and the TP23 (GND).

(3) Press the [RADIOOFF] button (S3) to set the STOP mode.

(4) Press the [FFAMS] button (S4) or the [REWAMS] button

(S5).

4. PLAY mode (1) Check that the preset state is set. (2) Input the square wave or sine wave to the Q15-1(COLLEC-

TOR) and the TP23 (GND). (3) Press the [RADIOOFF] button (S3) to set the STOP mode. (4) Press the [REPEAT] button (S9) will mov e the slider

9 (

(NR) once towards the side R and then to the side F. Move

the DIRECTION switch (S1) according to this timing will

set the PLAY mode (side F). Press the

9 (

[REPEAT]

button (S9) another time and move the DIRECTION switch

(S1) according to the movement of the slider (NR) will set

the PLAY (R mode).

Note 1: If the above fails, perform from preset again. Note 2: Use the [REPEAT] (S9), [RADIOOFF] (S3),

9 (

[FFAMS] (S4), and [REWAMS] (S5) buttons on the remote

controller as much as possible. If no remote controller, do not touch the buttons with your hands, but using a stick with a round

Note 3: When using headphones, the timing for move the DIRECTION

tip.

switch (S1) can be determined from the beep sound.

– MAIN Board (side B) –

TAPE DETECT

(S901-1)

(S901-2)

REW AMS

(S5)

RADIO OFF

ATS

FF AMS

(S4)

(S3)

REPEAT

(S9)

connect to the plunger (PM901)

battery terminal

’

square wave (sine wave) 10 Hz, – 3.5 dB

Q15

PH1

DIRECTION

FWDNSTOPnREV

AF oscillator

+ –

TP23

(GND)

battery terminal

connect to the motor (M601)

‘

– 3 –

Slider (NR) Rotation system

Rotation system during PLAY.

idler gear (A) (side T)

gear (REEL) (side T)

slider (NR)

cam gear

gear (NR) (FWD : left side/

REV : right side)

idler gear (A) (side S)

gear (REEL) (side S)

motor pulley

side F

side R

center

gear (Y)

insert flywheel (N) insert flywheel (R)

idler gear (B)

Rotation system during FF. Rotation system during REW.

gear (FR) (REW: right side)

idler gear (A) (side T)

gear (REEL) (side T)

cam gear

gear (FR) (FF: left side)

motor pulley

cam gear

clutch assy (F)

idler gear (A) (side S)

reverse pulley

gear (REEL) (side S)

motor pulle

clutch assy (F)

gear (Y)

insert flywheel (N) insert flywheel (R)

reverse pulle

– 4 –

gear (Y)

insert flywheel (N) insert flywheel (R)

clutch assy (F)

reverse pulley

SECTION 2

GENERAL

This section is extracted from instruction manual.

(FX673)

(FX877)

– 5 –

(FX673)

(FX877)

(FX673)

(FX877)

– 6 –

DISASSEMBLY

)

This set can be disassembled in the order shown below.

Set Case Block Assy Main Board

Belt (F2) Motor (Capstan/Reel) (M601)

SECTION 3

Lid Block Assy, Cassette

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

Ornament Block Assy, Reel

Holder (F) Assy

CASE BLOCK ASSY

claw

Open the lid battery case.

lid, battery case



Pinch Lever (N)/(R) Assy

Head, Magnetic (HP901

two screws (M1.4 × 2.5)

screw (M1.4 × 2.5)

two screws (M1.4 × 2.5)

Remove the case block ass in the direction of the arrow.

– 7 –

MAIN BOARD

Remove four solders of leaf switch.

flexible board

Remove two solders of plunger solenoid.

MAIN board

screw (M1.4)

two screws

Remove four solders of motor.

Note: On installation MAIN boar

adjust the S1 and slider.

slider

BELT (F2)

belt

Remove the solder of terminal board.

terminal board (T3)

– 8 –

+ 17 hidden pages

Sony WMFX-673, WMFX-877 Service manual

TABLE OF CONTENTS

SERVICING NOTES

GENERAL

DISASSEMBLY