Sony M-740V Manual de usuario

M-740V

E Model

Chinese Model

East European Model

SERVICE MANUAL

MICROCASSETTE

-CORDER

Sony Corporation

Audio Entertainment Group

General Engineering Dept.

9-873-089-11

2001B1600-1

SPECIFICATIONS

Ver 1.0 2001. 02

Model Name Using Similar Mechanism M-730V

Tape Transport Mechanism Type MZ-730V-99

Tape

(normal position type)

Recording system

2-track 1-channel monaural

Speaker

Approx. 3.6 cm (1

⁄

in.) dia.

Tape speed

2.4 cm/s (

⁄

ips), 1.2 cm/s (

⁄

ips)

Frequency range

300 - 4,000 Hz (with TAPE SPEED switch at 2.4 cm/s)

Input

Microphone input jack (minijack/PLUG IN POWER)

sensitivity 0.22 mV for 3 kilohms or lower impedance microphone

Output

Earphone jack (minijack) for 8 - 300 ohms earphone

Power output (at 10% harmonic distortion)

250 mW

Power requirements

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

Dimensions (w/h/d)

Approx. 62.2 ×120.5 ×25.5 mm (2

⁄

×4

⁄

×1

⁄

in.) incl. projecting

parts and controls

Mass

Approx. 130 g (4.6 oz)

Supplied accessories

Microcassette tape MC-30 (1) (European model only)

Batteries R6P (SR) (2) (European model only)

Carrying pouch (1) (M-830V and European model of M-740V only)

Design and specifications are subject to change without notice.

M-740V

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 ........................................................... 4

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

2-4. Speaker Assy, Microphone ............................................ 5

2-5. Main Board.................................................................... 6

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

2-7. LED Unit ....................................................................... 7

2-8. Head, Creamic (HRPE901, 902) ................................... 7

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

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

5. DIAGRAMS

5-1. Block Diagram ............................................................ 11

5-2. Printed Wiring Board................................................... 12

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

6. EXPLODED VIEWS

6-1. Cabinet Section ........................................................... 14

6-2. Mechanism Deck Section (1) ...................................... 15

6-3. Mechanism Deck Section (2) ...................................... 16

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

M-740V

SECTION 1

GENERAL

EAR

Microphone

Micrófono

>PAUSE

CUE/

REVIEW

VOR

TAPE SPEED

TAPE COUNTER

CUE MARKER

MIC (PLUG

IN POWER)

REC lamp (M-830V)

Indicador REC (M-830V)

REC/BATT lamp (M-740V)

Indicador REC/BATT (M-740V)

FAST PB

EAR

>PAUSE

CUE/

REVIEW

TAPE SPEED

FAST PB

Tape direction

indicators

Indicadores de

sentido de la cinta DIR.

DIR.

This section is extracted

from instruction manual.

M-740V 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

2-2. LID, BATTERY CASE

Set Lid assy, cassette Head, ceramic

(HRPE901,902

)

LED unit

Lid, battery case

Cabinet (rear)

assy

Main board Mechanism

deck

Speaker, Microphone

(MIC901)

Lid assy, cassette

2axis

3axis

4claw

Zp(Eject/Stop) button

Lid, battery case

1claw

M-740V

2-3. CABINET (REAR) ASSY

Note : When installing, fit the knobs and switches.

2-4. SPEAKER, MICROPHONE (MIC901)

2Four screws

(B1.7 ×16)

1Screw

(B1.7 ×5)

3Claw

5Cabinet

(rear) assy

4Claw

Switch

(TAPE SPEED)

Switch

(PAUSE)

Knob

(PAUSE)

Knob

(FR)

4Unsolder 2 places.

1Unsolder 2 places.

2Two screws

(B2 ×2.5)

3Speake

8Microphone

(MIC901)

5Holder (MIC)

7Mic cushion

M-740V

2-6. MECHANISM DECK

2-5. MAIN BOARD

Unsolder 8 places.

Two screws

Unsolder 6 places.

Main board

Unsolder 4 places.

4Mechanism deck

Button

(EJECT/STOP)

Button

(PLAY)

Button

(REC)

M-740V

2-7. LED UNIT

2-8. HEAD, CERAMIC (HRPE901, 902)

Blacket (LED)

Claw

LED unit

1Three screws

(1.7 ×2.3) tapping

1Claw

3M1.4, special hea

4M1.4, special head

2Arm (pinch roller) assy

5Head, ceramic

(HRPE901, 902)

M-740V

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

Torque Measurement

SECTION 3

MECHANICAL ADJUSTMENTS

Record/Playback/Erase Head Azimuth Adjustment

Setting:

VOL control : mechanical mid

TAPE SPEED switch : 2.4cm/s

VOR switch : OFF

FAST PB switch : OFF

Procedure:

1. Mode : Playback

Adjustment Location :

Test Tape

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).

EAR jack (J102)

set

16 Ω

test tape

S-2-A030A

(3 kHz, –20 dB) level meter

Remove the cover (AZ)

Head azimuth

adjustment scre

(FWD)

(REV)

Tape Tension Measurement

Mode

Forward

Reverse

Fast Forward

Rewind

Torque Meter

CQ-102M

CQ-102MR

CQ-201M

Meter Reading

0.49 to 0.98 mN •m

(5 to 10 g •cm)

(0.07 to 0.140 oz •inch)

0.49 to 0.98 mN •m

(5 to 10 g •cm)

(0.07 to 0.140 oz •inch)

more than 2.94 mN •m

(more than 30 g •cm)

(more than 0.42 oz •inch)

more than 2.94 mN •m

(more than 30 g •cm)

(more than 0.42 oz •inch)

Mode

Forward

Reverse

Torque Meter

CQ-403M

CQ-403MR

Meter Reading

more than 2.45 mN •m

(more than 25 g)

(more than 0.35 oz)

more than 2.45 mN •m

(more than 25 g)

(more than 0.35 oz)

Type

S-2-A030A

WS-24

Signal

3 kHz, –20 dB

3 kHz, –10 dB

Used for

Head Azimuth Adjustment

Tape Speed Adjustment

Tape Speed

(cm/s)

2.4

1.2/2.4

M-740V

Specification Value:

Tape Speed Adjustment

Setting:

VOL control : mechanical mid

VOR switch : OFF

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

tapeshould be within ±0.5%.

Adjustment Location :

First remove the plate, blind.

1. Tape Speed : 2.4 cm/s

Playback WS-24 (tape center part) and adjust RV601 so that

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

2. Tape Speed : 1.2 cm/s

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

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

0000

EAR jack (J102)

digital frequenc

counter

set

16 Ω

test tape

WS-24: tape speed 1.2/2.4cm/s

(3 kHz, –10 dB)

Remove the

plate, blind.

RV602

(1.2 cm/s)

RV601

(2.4 cm/s) Speed adjustable

resistors

Tape Speed

1.2/2.4 cm/s

Frequency counter

2,880 to 3,120 Hz

M-740V

• IC Block Diagrams

IC101 LA4168ML-TE-L

SECTION 5

DIAGRAMS

IC601 LB1877V-TLM

–

222324

2526272829

235

4678910

111 12 13 14 15

1819

300k

EQ MIC

2.2k

30k

PAUSE

POWER

MIC

VCC

Vref R/P

R, F

GVN

VOX

SPEED

ALC

VOX

20k

REC

PRE GND

EQ IN

MIC IN

Vref OUT

MIC VCC

R, F OUT

LED DRIVE

R/P SW

PAUSE

P/R MUTE

GVN CONT

GVN Vref

GVN GND

GVN OUT

PRE NF

PRE OUT

REG IN

REG OUT

ALC CONT

VOX CONT

VOX DELAY

GNV SPEED UP

AUT STOP CONT

AUT STOP IN

PWR IN

PWR OUT1

PWR GND

PWR OUT2

Vcc

UOUT

VCC

OUT

VSP

IN+

VREF

S/S

20 19 18 17 16 15 14 13 12 11

VOUT

WOUT

P-GND

OSC

COM

GND

1 2 3 4 5 6 7 8 9 10

DRIVER STARTUP

DIR LOGIC

STARTUP

DET

WAVEFORM

DET

CURRENT

DET

SPEED

DET

LOCKING

PROTECT

OSC

BIASREF V

TSD +

–

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