Sony WMFX-663 Service manual

WM-FX661/FX663/FX665

SERVICE MANUAL

Ver 1.1 2002. 01

Photo : WM-FX661

AEP Model

WM-FX661/FX663/FX665

E Model

Chinese Model

WM-FX663/FX665

UK Model

Australian Model

WM-FX665

Canadian Model

WN-FX663

9-924-908-12

2002A1600-1

RADIO CASSETTE PLAYER

Sony Corporation

Personal Audio Company Published by Sony Engineering Corporation

Specification ················································································· 1

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

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

3. DISASSEMBLY

3-1. Case Assy Removal ······················································· 4 3-2. Tuner Board Removal ··················································· 4 3-3. Audio Board Removal··················································· 5 3-4. Cassette Lid Assy Removal ··········································· 5 3-5. Mechanism Deck Removal ··········································· 6

4. MECHANICAL ADJUSTMENT ·································· 7

5. ELECTRICAL ADJUSTMENT ···································· 7

6. DIAGRAMS········································································ 9

6-1. Block Diagram ······························································ 9 6-2. IC Pin Function Description········································ 11 6-3. Printed Wiring Boards (Tuner Section) ······················· 13 6-4. Schematic Diagram (Tuner Section) ··························· 17 6-5. Schematic Diagram (Audio Section)···························20 6-6. Printed Wiring Board (Audio Section) ························ 23

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

À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS PAR 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 PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

7. EXPLODED VIEWS

7-1. Cabinet Section ··························································· 29 7-2. Audio, Tuner Board Section ········································ 30 7-3. Mechanism Section (MT-WMEX550-125) ·················31

8. ELECTRICAL PARTS LIST ······································· 32

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron aroud 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.

— 2 —

• LOCATION OF CONTROL

SECTION 1

GENERAL

1 OPEN knob

2 PRESET + /AMS FF button

!¢

3 PRESET – /AMS REW button

4 TUNING + button

5 TUNING – button

6 ENTER button

7 ˇ /REPEAT button

!“

8 p /RADIO OFF button

9 MENU button

0 SET button

!` VOLUME knob

!£

!“ HOLD knob

2 REMOTE jack

!£

!¢ Display window

! BAND button

SECTION 2

SERVICE NOTE

• Regarding the method of adjustment and voltage check, perform sections 3-1 and 3-2 of the DISASSEMBLY, and attach the JIG (extension cable) to the AUDIO board as shown below.

JIG Part No. : J-2503-005-A

Screw (M1.4 × 5.0)

JIG

Screw (M1.4 × 5.0)

TUNER board

Screw (M1.7 × 4.0)

AUDIO board

— 3 —

SECTION 3

)

DISASSEMBLY

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

CASE ASSYSET

TUNER BOARD CASSETTE LID ASSY

AUDIO BOARD

MECHANISM DECK

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

3-1. CASE ASSY REMOVAL

6 Case assy

2 Screw

(M1.4 × 2.2)

1 Screw (M1.4 × 3)

4 Screws

(M1.4 × 2.2)

3 Screw (M1.4 × 2.2

3-2. TUNER BOARD REMOVAL

4 TUNER board

1 Screws (M1.7 × 6)

2 Screw (M1.7 × 3)

3 Screw

(M1.4 × 4.5)

6 GUIDE (TU)

— 4 —

3-3. AUDIO BOARD REMOVAL

7 AUDIO board

4 Flexible board

2 Remove solder

1 Screw (M1.7 × 3)

3 Remove solder

3-4. CASSETTE LID ASSY REMOVAL

2 Screw (M1.4 × 2)

5 Cassette lid assy

3 Screw (M1.4 × 2)

1 OPEN button

— 5 —

3-5. MECHANISM DECK REMOVAL

4 Reel ornament

5 Mechanism deck

— 6 —

SECTION 4

MECHANICAL ADJUSTMENT

SECTION 5

ELECTRICAL ADJUSTMENT

PRECAUTION

1. Clean the following parts with a denatured-alcahol-moistened

sweb : Playback head Pinch roller Rubber belt Capstan

2. Demagnetize the playback head using a demagnetizer.

3. Do not use a magnetized screwdriver for adjustments.

4. After adjusting, apply screw-locking compound onto the

adjusted parts.

5. Unless specified otherwise, use a specified voltage (1.3V) to

perform the adjustments.

Torqu Measurement

Mode

FWD FWD

Back Tension REV REV

Back Tension FF REW

Torqu meter

CQ-102C

CQ-102RC

CQ-201B

Meter reading

20 to 30 g · cm

0.4 to 2.0 g · cm

20 to 30 g · cm

0.4 to 2.0 g · cm

More than 40 g · cm

PRECAUTION

1. Specified voltage : 1.3V

2. Switch position DOLBY NR switch : OFF AVLS switch : OFF

CASSETTE SECTION

Test Tape

Type

WS-48A

Tape Speed Adjustmnet

Procedure :

Test tape WS-48A (3kHz, 0dB)

1. Playback WS-48A (Tape center part) in the FWD state and adjust RV601 so that the frequency counter reading becomes 2,970Hz to 3030Hz.

2. Playback WS-48A (Tape center) in the REV state. Check that frequency counter reading is within 60Hz of the reading of step1.

Signal

3kHz, 0dB

Set

Purpose

Tape Speed Adjustment

Frequency counte

16Ω

–

PHONES jack

Adjustment Point :

[MAIN BOARD] — SIDE A —

RV601 : Tape speed

— 7 —

TUNER SECTION

)

[AM]

BAND switch : AM

FM VCO Adjustment

Procedure :

FM RF signal generator

AM RF signal generator

30% amplitude modulation by 400Hz signal. Output level : as low as possible

[FM]

BAND switch : FM

FM RF signal generator

22.5kHz frequency deviation by 400Hz signal. Output level : as low as possible.

Set

Put the lead-wire antenna close to the set.

0.01µF to ANT (TP1

Level meter

32Ω

–

0.01µF to ANT (TP1

Carrier frequency : 98MHz Modulation : No moduration Output level : 0.1V (100dB)

1. Connect the frequency counter to the positions shown below.

2. Turn the set to 98MHz.

3. Adjust RV1 for 18,900 to 19,100 Hz reading on the frequency counter.

Frequency counter

TP23

(IC7 pin !™)

IC7 pin 9

1µF

–

100Ω

PHONES

• Repeat the procedures in each adjustment several times, and the frequency coverage and tracking adjustments should be finally done by the trimmer capacitors.

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 621kHz

CT1 1,395kHz

FM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

L3 10.7MHz

FM VOLTAGE ADJUSTMENT

1.05V to 1.15V (3.55 to 3.65V)

L2 76MHz (87.5MHz)

( ) : Saudi Arabia model

Adjustment Parts Location :

[TUNER BOARD] — SIDE A —

L2 : FM Voltage Adjustment

TP1

TP13

RV1 : FM VCO Adjustment

L3 : FM IF Adjustment

CT1 : AM Tracking Adjustment

L4 : AM Tracking Adjustment

— 8 —

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