Sony M-730V Bedienungsanleitung

– 1 –

SERVICE MANUAL

M-730V/830V

MICROCASSETTE

-CORDER

SPECIFICATIONS

Ver 1.1 1999. 01

MICROFILM

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MZ-730V-99

US Model

Canadian Model

AEP Model

E Model

M-730V/830V

Chinese Model

M-730V

Tourist Model

M-830V

Photo : M-830V

Ver 1.1 2000. 01

– 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 ................................................................ 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 ........................................................ 13

5-3. Schematic Diagram ........................................................... 15

6. EXPLODEDVIEWS

6-1. Cabinet Section ................................................................. 17

6-2. Mechanism Deck Section (1) ............................................ 19

6-3. Mechanism Deck Section (2) ............................................ 20

7. ELECTRICAL PARTS LIST.....................................21

– 3 –

SECTION 1

GENERAL

1VOL knob

2MIC jack

3EAR jack

4VOR switch

5REC/BATT lamp

6FAST PB switch (M-830V ONLY)

7DC IN 3V jack

8TAPE COUNTER

9CUE MARKER button (M-830V ONLY)

0i(Battery) lamp (M-830V ONLY)

!¡ Microphone

!™ r(REC) button

!£ CPAUSE knob

!¢ œ(Playback) button

!∞ CUE/REVIEW knob

!§ TAPE SPEED select knob

!¶ wp(Eject/Stop) button

!• DIR cknob

!ª FWD/REV

∑

– 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

2-2. LID, BATTERY CASE

Set Lid assy, cassette Head, ceramic (HRPE901,902)

LED unit

Lid, battery case Cabinet (rear)

assy Speaker assy,

Microphone Main board Mechanism

deck

Lid assy, cassette

(Eject/Stop) button

Lid, battery case

– 5 –

2-3. CABINET (REAR) ASSY

Note : When installing, fit the knobs and switches.

2-4. SPEAKER ASSY, MICROPHONE

Four screws

(B1.7

16)

Screw

(B1.7

Claw

Cabinet

(rear) assy

Claw

Switch

(TAPE SPEED)

Switch

(PAUSE)

Knob

(PAUSE)

Knob

(FR)

Unsolder the

2 places.

Unsolder the

2 places.

Two screws

(B2

2.5)

Speaker ass

Microphone

unit

Mic cushion

– 6 –

2-6. MECHANISM DECK

2-5. MAIN BOARD

Unsolder the 8 places.

Two screws

Unsolder the

6 places.

Main board

Unsolder the

4 places.

Mechanism deck

Button

(EJECT/STOP)

Button

(PLAY)

Button

(REC)

– 7 –

2-7. LED UNIT

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

Blacket (LED)

Claw

LED unit

Three screws

(1.7

2.3) tapping

Claw

M1.4, special head

Arm (pinch roller) assy

Head, ceramic

(HRPE901, 902)

– 8 –

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 de-

magnetizer. (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 sup-

ply voltage unless otherwise noted.

Power supply voltage : 3 Vdc

TAPE SPEED switch : 2.4cm

Torque Measurement

Mode Torque Meter Meter Reading

5 to 10 g • cm

Forward CQ-102M (0.07 to 0.140 oz • inch)

5 to 10 g • cm

Reverse CQ-102MR (0.07 to 0.140 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 25 g

Forward CQ-403M (more than 0.35 oz)

more than 25 g

Reverse CQ-403MR (more than 0.35 oz)

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 :

TestTape

Type Signal Used for Tape Speed

(cm/s)

S-2-A030A 3 kHz, – 20 dB

Head Azimuth Adjustment

2.4

WS-24

3 kHz, – 10 dB

Tape SpeedAdjustment 1.2/2.4

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 (J101)

set

Ω

test tape

S-2-A030A

(3 kHz, –20 dB) level meter

Remove the cover (AZ)

Head azimuth

adjustment scre

(FWD)

(REV)

– 9 –

Specification Value:

Tape Speed Frequency counter

1.2/2.4 cm/s 2,880 to 3,120 Hz

Tape Speed Adjustment

Setting:

VOL control : mechanical mid

VOR switch : OFF

FAST PB switch : ON (M-830V model only)

Procedure:

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

ment 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 (J101)

digital frequenc

counter

set

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

– 10 –

• IC Block Diagrams

IC101 LA4168ML

IC501 MM1251M

(M-830V model only)

SECTION 5

DIAGRAMS

IC601 LB1877V

–

21222324252627282930

235

4678910

111 12 13 14 15

181920

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 +

–

1234

–

VOLTAGE UP

CIRCUIT

VREF

VCC

HYS

GND

OUT

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