Sony Pressman M-450 Bedienungsanleitung

SERVICE MANUAL

MICROCASSETTE

™

-CORDER

SPECIFICATIONS

Photo : M-450

Model Name Using Similar Mechanism New

Tape Transport Mechanism Type MZ-455-99

Ver 1.2 2004.05

East European Model

E Model

M-450/455

Chinese Model

M-450

9-873-588-03

2004E02-1

Sony Corporation

Personal Audio Company

Pubulished by Sony Engineering Corporation

Tape

(MICRCCASSETTE)™(normal position type)

Recording system

2-track 1-channel monaural

Speaker

Approx. 3.6 cm (1 17 ⁄ 16 in.) dia.

Tape speed

2.4 cm / s (15 ⁄16 ips), 1.2 cm/s (15

⁄ 32 ips)

Frequency range

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

Output

Earphone jack (minijack) for 8 - 300 Ω 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 ×119.1 ×25.4 mm (2 1⁄2 × 43

⁄4 × 1 in.) incl.

projecting parts and controls

Mass

Approx. 109 g (3.9 oz) (main unit only)

Supplied accessories

Microcassette tape MC-30 (1) (M-450 : EE/M-455 : E)

Design and specifications are subject to change without notice.

M-450/455

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.

TABLE OF CONTENTS

Specifications ........................................................................... 1

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

2. DISASSEMBLY

2-1. Cassette Holder Asssy ................................................ 4

2-2. Cabinet (Rear)............................................................. 4

2-3. Cabinet (Front) ........................................................... 5

2-4. Main Board, Mechanism Deck ................................... 5

2-5. Head, Magnetic (HRPE901) ....................................... 6

2-6. Motor (M901) ............................................................. 6

3. ADJUSTMENTS

3-1. Mechanical Adjustments ............................................ 7

3-2. Electrical Adjustments ................................................ 7

4. DIAGRAMS

4-1. Block Diagrams .......................................................... 9

4-2. Printed Wiring Boards .............................................. 10

4-3. Schematic Diagram....................................................11

5. EXPLODED VIEWS

5-1. Cabinet (Rear) Section.............................................. 13

5-2. Cabinet (Front) Section ............................................ 14

5-3. Mechanism Deck Section ......................................... 15

6. ELECTRICAL PARTS LIST ........................................ 16

Ver 1.2

• How to recognize former type and new type mechanism

deck

Former Type New Type

M-450/455

SECTION 1

GENERAL This section is extracted from

instruction manual.

M-450/455 SECTION 2

DISASSEMBLY

2-1. CASSETTE HOLDER ASSY

2-2. CABINET (REAR)

zCAUTIONS DURING ASSEMBLY

Align these switches and knobs

S601 tKnob (pause)

Lever (F/R) t Knob (FR)

Cassette holder ASSYSet Cabinet (rear) Cabinet (front) Main board, Mechanism deck Head, magnetic (HRPE901)

Motor (M901)

The equipment can be removed using the following procedure.

Cassette holder ASS

Eject

Claws

Cabinet (front)

Lever (F/R)

Lid, battery case

Knob (FR)

Knob (pause)

Cabinet (rear)

S601

Screw

(B1.7

Four screws

(1.7

16)

Claw

M-450/455

2-3. CABINET (FRONT)

2-4. MAIN BOARD, MECHANISM DECK

Main board

Mechanism deck

Scre

Remove solder

(four places).

Screw

Remove solder

(four places)

Head flexible board

zNOTE DURING ASSEMBLY

Align S902 and knob (tape speed).

Knob (tape speed)

Cabinet (front)

Mic case

Remove solder

(two places)

To speaker

S902

M-450/455

claw

M1.4, special head

arm (pinch roller) assy

head, magnetic

(HRPE901)

2-5. HEAD, MAGNETIC (HRPE901)

2-6. MOTOR (M901)

belt (flywheel)

belt (counter, tape)

How to apply the belts

belt (flywheel)

M901

flywheel assy

Motor (M901)

Mechanism deck

Two screws

Ver 1.2

M-450/455

3-2. ELECTRICAL ADJUSTMENTS

Standard Output Level

Output terminal EAR

Load impedance 8Ω

Output level 78mV (– 20dB)

TestTape

Type Signal Used for Tape speed

(cm/s)

S-2-A030A 3kHz, –20dB Azimuth Adjustment 2.4

WS-24 3kHz, –10dB Tape Speed Adjustment 2.4

WS-12 1.2

PRECAUTION

Record/Playback/Erase Head Azimuth Adjustment

Switch position

VOLUME : Mechanical center

TAPE SPEED switch : 2.4cm/s

VOR switch : OFF

Procedure :

– FWD/REV playback –

set

test tape

S-2-A030A

(3kHz, –20dB) level mete

earphone jack

Ω

rRotate the screw to adjust level meter reading to the maximum.

Note : Adjust to the maximum peak though there may be two or

three peaks

Adjustment Location :

3-1. MECHANICAL ADJUSTMENTS

PRECAUTION

1. Before adjusting, clean the following parts with a piece of cot-

ton moistened with alcohol.

record/playback/erase head pinch roller

rubber belt capstan

2. Demagnetize the record/playback/erase head using a head de-

magnetizer.

3. Do not use a magnetized screwdriver for adjustments.

4. After adjusting, apply screw-locking compound to the adjusted

parts.

5. Unless specified otherwise, use a specified voltage (3V DC) to

perform the adjustments.

Torque Measurement

Tape Speed switch : 2.4cm/s

Mode Torque Meter Meter Reading

Forward CQ-103M 0.5 –0.98mN • m

(5 – 10 g • cm)

(0.07 to 0.138 oz• inch)

Fast Forward CQ-201M 0.5 –0.98mN • m

(5 – 10 g • cm)

(0.07 to 0.138 oz• inch)

Tape Tension Measurement

Tape Speed switch : 2.4cm/s

Mode Torque Meter Meter Reading

FWD CQ-403M more than 25 g

(more than 0.9 oz)

SECTION 3

ADJUSTMENTS

0db=0.775V

head azimuth

adjutment scre

M-450/455

Tape Speed Adjustment

Switch position

VOLUME : Mechanical center

VOR switch : OFF

Procedure :

After adjusting the 2.4cm/s speed, adjust the 1.2cm/s speed.

– Playback –

set

Test tape

WS-24, WS-12

(3kHz, –10dB)

speed checker

frequency counter

earphone jack

Ω

Adjustment Value :

Adjustment Speed Frequency counter

Part

RV602 2.4cm/s 2,880 – 3,120Hz

RV601 1.2cm/s 2,850 – 3,150Hz

Frequency difference between the beginning and the end of the

tape should be within 0.5%.

2.4cm/s (15Hz)

1.2cm/s (15Hz)

Adjustment Location :

– Back view –

RV602

2.4cm

RV601

1.2cm

speed adjustable resistor

Plate, blind

M-450/455

4-1. BLOCK DIAGRAMS

SECTION 4

DIAGRAMS

414

511

DRIVE

FEEDBACK

EQ RC-

NETWORK INITIAL

MUTE

Q105

OSC

LOGIC

CIRCUITY

S101 (4/4)

REC PB

S101 (3/4)

REC PB

RIPPLE

FILTER

ALC

MIC901

MIC

S101

(1/4,2/4)

REC PB

Q101

Q102 Q104 Q106

+VDD

M901

CAPSTAN/

REEL

MOTOR

HRPE901

REC/PB

HEAD

S601

OFF

PAUSE

ERASE

HEAD

+VCC

U OUT

V OUT

W OUT

VCC

RV601

TAPE SPEED

(1.2cm)

RV601

+VCC

VCC

VREF

IN+

S/S

S902 (1/2)

TAPE SPEED

1.2cm 2.4cm

RV602

TAPE SPEED

(2.4cm)

S902 (2/2)

TAPE SPEED

2.4cm

1.2cm

PRE AMP

IC101 (1/2)

BTL POWER AMP

IC101 (2/2)

VREF

RF IN

PRE OUT

RF OUT

+VCC

PRE+IN

PRE-IN POW+INA

POW-INA

POW+INB

POW-INB

POW

OUTA

PWB

OUTB

ALC IN

Q103

MUTE

MOTOR DRIVER

IC601

S102

(POWER)

J101

EAR

SP901

(SPEAKER)

RV101

VOL w

PAUSE .

D301

BATT

J901

DC IN 3V

DRY BATTERY

SIZE "AA"

(IEC DESIGNATION R6)

2PCS, 3V

• SIGNAL PATH

: REC

: PB

M-450/455

10 10

SP901

SPEAKER

J101

EAR

RV101

VOL

MIC901

MIC

D301

BATT

HRPE901

ERASE

HEAD

RECORD/

PLAYBACK

HEAD

OFF PAUSE

PAUSE

S601

BLK

ORG

WHT

RED

M901

CAPSTAN/

REEL

MOTOR

S102

(POWER)

DRY BATTERY

SIZE "AA"

(IEC DESIGNATION R6)

2PCS, 3V

J901

DC IN 3V

S902

2.4cm 1.2cm

TAPE SPEED

IC601

THP601

C601

C603

C609

C608

C605

C604

R152

R151

C104

IC101

Q104

C610

C602

R153

R612

R613

Q103

Q105

D101

Q102

R601

R602

R603

R604

R605

R606

R607

R608

RV602

R131

R132

R133

R135

R137

R138

R139

R140

R141

R142

R143

R144

C131

C132

C133

C136

C137

C138

C139

C140 C141

C142

C143

C145

C147

C152

R609

R610

R110

R111

R112 R113

R114

R115

R116

R119

R120

R122

R124

R127

C112

C113

C114

C115

C116

C105

C108

C117

C101

R108

R105

C102

R104

R102

R136

C134

Q106

R117

R118

R103

R123

RV601

C135

C109

R301

R302

C144

JC302

JC156

JC604

JC605

JC157 JC301

JC101

JC102

JC159

JC158

JC105

JC103

JC108

JC104

JC138

JC140

JC139

JC137

JC133

JC109

JC134

JC136 JC135

JC142

JC141

JC153

JC602

JC155

JC154

JC143

JC603

JC601

JC131

JC132

JC110

C119

JC111

JC112

R128

Q101

C151

C607

C146

BLK

RED

(11)

1-683-292-

MAIN BOARD

16 9

1510

(4/4)(3/4)

S101

REC

(2/4)(1/4)

23 4 5 6

4-2. PRINTEDWIRING BOARDS – MAIN BOARD –

Note:

•X: parts extracted from the component

side.

•b: Pattern from the side which enables

seeing.

• Semiconductor

Location

Ref. No. Location

D101

D301

IC101

IC601

Q101

Q102

Q103

Q104

Q105

Q106

A-4

D-2

B-3

C-5

B-3

C-3

B-3

C-4

B-3

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