Sony WMFX-561 Service manual

WM-FX561/FX563

SERVICE MANUAL

Ver 1.1 2002. 01

Photo : WM-FX561

AEP Model

E Model

Chinese Model

WM-FX561/FX563

Canadian Model

WM-FX563

9-924-907-12

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

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

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

— 2 —

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.

• 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 œ /REPEAT button

7Ł

8 p /RADIO OFF button 9 MENU button

!¡

!™

0 SET button !¡ VOLUME knob

!™ HOLD knob

REMOTE jack

!£

!§

!¶

!£

!¢ Display window ! BAND button !§ Battery case

!¶ DC IN 1.5V

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.

SET

CASE ASSY

TUNER BOARD CASSETTE LID ASSY

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

3-1. CASE ASSY REMOVAL

4 Case assy

1 Screw

(M1.4 × 2.2)

1 Screw (M1.4 × 3.0)

AUDIO BOARD

MECHANISM DECK

2 Screws (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

5 AUDIO board

3 Flexible board

1 Remove solder

2 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 2,970 to 3,030 Hz.

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

Put the lead-wire antenna close to the set.

[FM]

BAND switch : FM

FM RF signal generator

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

32Ω

Set

0.01µF

Level meter

–

to ANT (TP1

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 98 MHz.

3. Adjust RV1 for 18,900 to 19,100 Hz reading on the frequency 1counter.

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

( ) : Saudi Arabia model

FM VOLTAGE ADJUSTMENT

1.05 to 1.15 V (3.55 to 3.65 V)

L2 76MHz (87.5MHz)

Adjustment Parts Location :

[TUNER BOARD] — SIDE A —

L2 : FM Voltage Adjustment

TP1

TP13

L3 : FM IF Adjustment

CT1 : AM Tracking Adjustmen

L4 : AM Tracking Adjustment

RV1 : FM VCO Adjustment

— 8 —

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