Sony Walkman WM-FX161 Bedienungsanleitung

MICROFILM

SERVICE MANUAL

RADIO CASSETTE PLAYER

Canadian Model

E Model

Model Name Using Similar Mechanism WM-FX101

Tape Transport Mechanism Type MF-WMFX103Y-48

SPECIFICATIONS

WM-FX161

87.6 – 108 MHz (Canadian)

87.6 – 107.9 MHz (E)

AM: 530 – 1,710 kHz (Canadian)

531 – 1,602 kHz (E)

– 2 –

TABLE OF CONTENTS

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

2. DISASSEMBLY ......................................................... 4

3. DIAL POINTER SETTING .................................. 6

4. MECHANICAL ADJUSTMENTS....................... 7

5. ELECTRICAL ADJUSTMENTS......................... 7

6. DIAGRAMS

6-1. Block Diagram ................................................................ 9

6-2. Printed Wiring Board ...................................................... 11

6-3. Schematic Diagram ......................................................... 13

7. EXPLODED VIEWS................................................ 16

8. ELECTRICAL PARTS LIST ............................... 18 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.

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.

SERVICING NOTES

HOWTO CHANGETHE CERAMIC FILTERS

This model is used two ceramic filters of CF2 and X2.

You must used same type of color marked ceramic filters in order

to meet same specifications.

Therefore, the ceramic filter must changed two pieces together

since it's supply two pieces in one package as a spare parts.

Mark Center frequency

red 10.70MHz

blue 10.67MHz

orange 10.73MHz

black 10.64MHz

white 10.76MHz

mark CF2

– 3 –

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 4 –

CABINET (REAR) ASS’Y

Insert the precision screw driver

(1.4 mm flat-blade) in to the slit

at claw

and release the claw.

Remove the cabinet (rear) ass’y. (Re-

lease all claw

in alphabetical

order.)

MECHANISM DECK (MF-WMFX103Y-48)

AND MAIN BOARD

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

SECTION 2

DISASSEMBLY

• This set can be disassembled in the order shown below.

cassette holder

cabinet (rear) ass’y

Remove the mechanism deck

(MF-WMFX103Y-48) and MAIN board

in the direction of the arrow.

Note: Make sure to put the head

flexible board to ditch befor

install the mechanism deck

and MAIN board.

SET CABINET (REAR) ASS’Y MECHANISM DECK (MF-WMFX103Y-48)

AND MAIN BOARD MAIN BOARD

CASSETTE HOLDE

– 5 –

MAIN BOARD

CASSETTE HOLDER

three claws

MAIN boar

head flexible board

(CN301)

Remove the solder

of the motor wire.

front cabine

cassette hoder

Insert a precision screwdriver

(1.4 mm flat-blade) vertically

in to portion

to release

the hinge plate.

Portion

to release

the hinge plate.

– 6 –

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

SECTION 3

DIAL POINTER SETTING

align

pointe

Fig. 1

Rotate tune knob fully to arrow direction.

Align pointer with arrow

marked side as shown in

Fig. 1 and then fit to groove

in the order of

and

pointer

– 7 –

SECTION 4

MECHANICAL ADJUSTMENTS

Mode Tension Meter Meter Reading

FWD CQ-403A more than 40 g

(more than 1.4oz)

•Tape Pulling Force Measurement:

PRECAUTION

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

swab:

playback head pinch roller

capstan rubber belt

2. Demagnetize the playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. The adjustments should be performed with the rated power

supply voltage (2.5V) unless otherwise noted.

•Torque Measurement:

Mode Torque Meter Meter Reading

FWD 20 – 42 g•cm

(0.28 – 0.58 oz•inch)

FWD CQ-102C 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)

SECTION 5

ELECTRICAL ADJUSTMENTS

PRECAUTION

• Supplied voltage : 2.5 V

• Switch and control position

VOL control : maximum

AVLS switch : NORM

NORM•DX CrO2/METAL•LOCAL switch :

NORM•DX (Canadian)

NORM•ST CrO2/METAL•MONO switch : NORM•ST (E)

TAPE SECTION

Setup :

FM AM TAPE switch : TAPE

Test Tape

1. Play back WS-48A (tape center part) and Adjust the RV601 so

that the frequency counter reading becomes 3,000 Hz ± 15 Hz

2. Play back WS-48A tape the beginning and the end part.

Check that the frequency counter reading is within 1.5 % of

the reading of step 1.

Tape Signal Used for

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

0 dB = 0.775 V

Tape speed adjustment

Procedure :

–

test tape

WS-48A

(3 kHz, 0dB) frequency

counter

set

jack

Canadian: 32

Ω

E: 16

Ω

RV601

– 8 –

AM Section

Setup :

FM AM TAPE switch : AM

Procedure :

• Repeat the procedure in each adjustment several times since L4,

1 affects CT1-4, 1-1 and CT1-4, 1-1 affects L4, 1. Both the

frequency coverage and tracking adjustments should end with

the final adjustment of the trimmer capacitors.

RADIO SECTION

FM Section

Setup :

FM AM TAPE switch : FM

Procedure :

• Repeat the procedure in each adjustment several times since

L3, 2 affects CT1-3, 1-2 and CT1-3, 1-2 affects L3, 2. Both the

frequency coverage and tracking adjustments should end with

the final adjustment of the trimmer capacitors.

set +

–

FM RF Signal

generator

0.01

jack

level meter

(AC0.5 – 5 V range)

TP (FM RF IN)

Canadian: 32

Ω

E: 16

Ω

1 kHz 100% FM modulation

frequency deviation

75 kHz

Output level: as low as possible

AM RF Signal

generator Put the lead-wire

antenna close to

the set

400 Hz 30 % AM

modulation

Output level: as low as possible

set +

–

jack

level mete

Canadian: 32

Ω

E: 16

Ω

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter

Adjustment Signal generator Pointer

device frequency position

L3 86.0 ± 0.2 MHz f minimum

CT1-3 109.5 ± 0.3 MHz f maximum

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

Adjustment Signal generator

device and set frequency

L2 86.0 MHz

CT1-2 109.5 MHz

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter

Adjustment Signal generator Pointer

device frequency position

L4 505 ± 5 KHz f minimum

CT1-4 1750 ± 20 KHz f maximum

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

Adjustment Signal generator

device and set frequency

L1 620 KHz

CT1-1 1400 KHz

Adjustment Location :

[MAIN Board] – Side B –

AM FREQUENCY COVERAGE

ADJUSTMENT

FM FREQUENCY COVERAGE

ADJUSTMENT

FM TRACKING

ADJUSTMENT

AM TRACKING

ADJUSTMENT

CT1-2

CT1-4

CT1-3

CT1-1

RV601

Connecting Location :

[MAIN Board] – Side A –

– 16 –

SECTION 7

EXPLODED VIEWS

• Items marked “*” are not stocked since they

are seldom required for routine service. Some

delay should be anticipated when ordering

these items.

• The mechanical parts with no reference num-

ber in the exploded views are not supplied.

• Accessories and packing materials are given

in the last of the electrical parts list.

NOTE:

• -XX and -X mean standardized parts, so they

may have some difference from the original

one.

• Color Indication of Appearance Parts

Example:

KNOB, BALANCE (WHITE) . . . (RED)

↑↑

Parts Color Cabinet's Color

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

(1) MAIN SECTION

2356

10 12

MF-WMFXIO3Y-48

1 X-3374-829-1 CABINET (REAR) (CF-O) SUB ASSY (E)

1 X-3374-830-1 CABINET (REAR) (CF-O) SUB ASSY (Canadian)

2 3-935-477-01 LID, BATT (E)

2 3-937-356-01 LID, BATT (Canadian)

3 3-910-896-01 GROUND, MOTOR

4 3-933-646-01 BUTTON (PLAY) (()

5 3-933-643-01 BUTTON (REW) (0)

6 3-933-644-01 BUTTON (FF) ())

7 3-933-647-01 BUTTON (STOP) (p)

8 A-3021-003-A MAIN BOARD, COMPLETE (E)

8 A-3021-004-A MAIN BOARD, COMPLETE (Canadian)

9 3-933-642-01 TERMINAL (+), BATTERY

10 3-910-895-01 TERMINAL (–), BATTERY

11 3-364-675-01 SPRING (CASSETTE)

12 3-910-902-12 KNOB (TUNE)

13 3-933-678-01 POINTER

14 3-933-675-01 GEAR (TUNE)

15 3-933-685-01 CABINET (FRONT) (CF-O) (E)

15 3-937-353-01 CABINET (FRONT) (CF-O) (Canadian)

16 X-3374-831-1 HOLDER (CF-B) SUB ASSY, CASSETTE (E)

16 X-3374-832-1 HOLDER (CF-B) SUB ASSY, CASSETTE

(Canadian)

17 3-922-628-01 SPRING, TORSION

L1 X-3371-847-1 ANTENNA SUB ASSY, FERRITE-ROD

– 17 –

(2) MECHANISM DECK SECTION

(MF-WMFX103Y-48)

HP901

M901

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

51 X-3367-902-1 ARM (N) ASSY, PINCH

52 3-364-328-01 SPRING, COMPRESSION

53 3-910-635-01 SCREW

54 3-910-647-01 LEVER (PR/O), PLAY

55 X-3368-729-1 CHASSIS ASSY

56 3-354-868-01 BELT

57 3-352-758-21 SCREW (M1.7), TOOTHED LOCK

HP901 1-500-115-11 HEAD, MAGNETIC (PLAYBACK)

M901 1-698-353-11 MOTOR, DC (REEL/CAPSTAN)

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