Sony M-430 - Microcassette Recorder Bedienungsanleitung

– 1 –

SERVICE MANUAL

M-430

MICROCASSETTE

-CORDER

Tape

y(normal position type)

Recording system

2-track 1-channel monaural

Speaker

Approx. 3.6 cm (1 7/16 in.) dia.

Tape speed

2.4 cm/s (15/16 ips), 1.2 cm/s (15/32 ips)

Frequency range

250 - 4,000 Hz (with TAPE SPEED switch at 2.4 cm/s)

Output

Earphone jack (minijack) for 8 - 300 ohms earphone

Power output (at 10% harmonic distortion)

160 mW

Power requirements

3 V DC batteries size AA (R6) ×2/External DC 3V power sources

Dimensions (w/h/d)

Approx. 62.2 ×121.5 ×24.3 mm (2 1/2 ×4 7/8 ×31/32 in.) incl. projecting

parts and controls

Mass

Approx. 125 g (4.5 oz.)

SPECIFICATIONS

Ver 1.0 1999. 02

Supplied accessory

Microcassette tape MC-30 (1)

Design and specifications are subject to change without notice.

MICROFILM

US Model

AEP Model

E Model

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MZ-430-99

– 2 –

TABLE OF CONTENTS

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 dam-

aged by heat.

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

2. DISASSEMBLY

2-1. Lid Assy, Cassette ............................................................... 4

2-2. Lid, Battery Case ................................................................ 5

2-3. Cabinet (Rear) Assy ............................................................ 5

2-4. Main Board ......................................................................... 6

2-5. Mechanism Deck................................................................. 6

2-6. Head, Ceramic..................................................................... 7

3. MECHANICAL ADJUSTMENTS..............................8

4. ELECTRICAL ADJUSTMENTS ...............................8

5. DIAGRAMS

5-1. Block Diagram .................................................................. 10

5-2. Printed Wiring Board ........................................................ 11

5-3. Schematic Diagram ........................................................... 13

6. EXPLODEDVIEWS

6-1. Cabinet Section ................................................................. 15

6-2. Mechanism Deck Section.................................................. 16

7. ELECTRICAL PARTS LIST.....................................17

– 3 –

SECTION 1

GENERAL This section is extracted

from instruction manual.

– 4 –

SECTION 2

DISASSEMBLY

•The equipment can be removed using the following procedure.

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

2-1. LID ASSY, CASSETTE

Stop the lid assy, cassette

halfway.

precision screwdriver

or equivalent

cabinet (front)

lid assy,

cassette

top view

precision screwdriver

or equivalent

lid assy, cassette

Set Lid assy,

cassette Cabinet (rear)

assy Main

board Mechanism

deck Head,

ceramic

Lid,

battery case

Note : When removing the cassette lid, put cloth on the end of a

screwdriver or use a polyacetal driver to avoid damage to

the cabinet.

– 5 –

2-3. CABINET (REAR) ASSY

Note : When installing, fit the knobs and switches.

2-2. LID, BATTERY CASE

claws

lid, battery case

screw (1.7x16)

screw (B1.7x5), tapping

screw (1.7x16)

claw

claws

switch

knob

cabinet (rear) assy

– 6 –

2-5. MACHANISM DECK

2-4. MAIN BOARD

(M1.4x3.0), locking

mic assy

MAIN board

Unsolder the 2 places.

Unsolder the 4 places.

Unsolder the 2 places.

button (STOP)

button (REC)

button (PLAY)

mechanism deck

(MZ-430-99)

– 7 –

2-6. HEAD, CERAMIC

claw

M1.4, special head

arm (pinch roller) assy

head, ceramic

– 8 –

EAR jack (J101)

set

Ω

test tape

S-2-A030

(3 kHz, –20 dB) level meter

Remove the

cover (AZ).

head azimuth

adjustment screw

PRECAUTION

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

swab :

record/playback/erase head pinch roller

rubber belts capstan

2. Demagnetize the record/playback/erase head with a head

demagnetizer. (Do not bring the head demagnetizer close to the

erase head.)

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

4. The adjustments should be performed with the rated power

supply voltage unless otherwise noted.

Power supply voltage : 3 Vdc

TAPE SPEED switch : 2.4cm/s

Torque Measurement

Mode Torque Meter Meter Reading

5 – 13 g • cm

Forward CQ-103M (0.07 – 0.180 oz • inch)

more than 30 g • cm

Fast Forward CQ-201M (more than 0.42 oz • inch)

more than 30 g • cm

Rewind CQ-201M (more than 0.42 oz • inch)

TapeTension Measurement

Mode Tension Meter Meter Reading

more than 20 g

Forward CQ-403M (more than 0.28 oz)

SECTION 3

MECHANICAL ADJUSTMENTS

Record/Playback/Erase Head Azimuth Adjustment

Setting:

VOL control : mechanical mid

TAPE SPEED switch : 2.4cm/s

Procedure:

1. Mode : Playback

Adjustment Location :

Test Tape

Type Signal Used for Tape Speed

(cm/s)

S-2-A030 3 kHz, – 20 dB

Head Azimuth Adjustment

2.4

WS-24 2.4

WS-12 3 kHz, – 10 dB TapeSpeedAdjustment 1.2

SECTION 4

ELECTRICAL ADJUSTMENTS

2. Turn the adjustment screw to obtain the maximum reading on

level meter.

Note: Several peaks may appear, but the maximum.

First remove the cover (AZ).

– 9 – – 10 –

M-430

5-1. BLOCK DIAGRAM

SECTION 5

DIAGRAMS

0000

EAR jack (J101)

digital frequency

counter

set

Ω

test tape

WS-24: tape speed 2.4cm/s

WS-12: tape speed 1.2cm/s

(3 kHz, –10 dB)

Remove the

plate, blind.

RV601

1.2cm/s

RV602

2.4cm/s

speed adjustable resistors

(REC / PB)

HRPE901

REC/PB/ERASE

HEAD

(ERASE)

D102

BATT

DRY BATTERY

SIZE "AA"

(IEC DESIGNATION R6)

2PCS, 3V

DC IN 3V

CN101

SP101

SPEAKER

J101

EAR

MIC901

MIC

S101-4

(REC/PB)

PB REC

S101-3

(REC/PB)

PB REC

S101-2

(REC/PB)

PB REC

S101-1

(REC/PB)

PB REC

+3V

115 3 14

8 4

ALC

PRE / POWER AMP

IC101

S602

2.4 cm

1.2 cm

2.4 cm

1.2 cm

TAPE

SPEED

RV601, 602

TAPE SPEED

RV101

VOL

RV602

1.2 cm

RV601

2.4 cm

MOTOR SERVO

IC601

_M901

MOTOR S601

PAUSE

OFF ON

S102

(POWER)

: REC

: PB

Signal Path

-1

-2

Tape Speed Adjustment

Setting:

VOL control : mechanical mid

Procedure:

• Reform 2.4 cm/s speed adjustment before 1.2 cm/s speed

adjustment mode : playback

Frequency difference between the beginning and the end of the tape

should be within ±0.5%.

2.4 cm/s (15 Hz)

1.2 cm/s (15 Hz)

Adjustment Location :

First remove the plate, blind.

1. Tape Speed : 2.4 cm/s

Playback WS-24 (tape center part) and adjust RV602 so that

reading on the digital frequency counter becomes 3,000 Hz.

2. Tape Speed : 1.2 cm/s

Playback WS-12 (tape center part) and adjust RV601 so that

reading on the digital frequency counter becomes 3,000 Hz.

Specification Value:

Tape Speed Frequency counter

2.4 cm/s 2,880 to 3,120 Hz

1.2 cm/s 2,850 to 3,150 Hz

– 11 – – 12 –

M-430

5-2. PRINTEDWIRING BOARD

Note:

•X: parts extracted from the component side.

•b: Pattern from the side which enables seeing.

2345678910111213

HRPE901

REC/PB/ERASE

HEAD

(REC/PB)

(ERASE)

HD+

HD–

HE+

HE–

()

D102 G-3

IC101 D-6

IC601 E-9

• Semiconductor

Location

Ref. No. Location

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