Sony TCM-20DV - Mini Cassette Recorder Bedienungsanleitung

SERVICE MANUAL

CASSETTE-CORDER

US Model

TCM-20DV/21DV/22DV/23DV

Canadian Model

TCM-20DV/22DV

AEP Model

TCM-20DV/21DV

E Model

TCM-20DV/23DV

Chinese Model

TCM-20DV

SPECIFICATIONS

TCM-20DV/21DV/

22DV/23DV

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MT-20DV-118

Photo: TCM-20DV

Supplied accessories

The instructions in this manual are for

4 models.

The TCM-20DV is the model used for

illustration purposes.

TCM- 23DV 22DV 21DV 20DV

AC power adaptor 1)

—a——

Battery charger adaptor 1)

—a——

Rechargeable batteries 2)

—a——

NC-AA, 1.2V, 700mAh,

Ni-Cd)

Cassette tape C-90 1)

——a—

Battery LR6 2)

——a—

Monaural microphone 1)

——a—

Super-directional

a———

microphone 1)

Carrying pouch 1)

——a—

Hand strap 1)

aaaa

attached to the unit)

Battery life

Approx. hours) EIAJ*)

Playback Recording

Sony alkaline

LR6 SG) 11 11

Sony R6P SR) 3 3

Sony

rechargeable

battery 33

NC-AA) fully

charged TCM-

22DV only)

* Measured value by the standard of

EIAJ Electronic Industries

Association of Japan). Using a Sony

HF series cassette tape and playing

back with speakers)

Note

The battery life may shorten

depending on the operation of the

unit.

For maximum performance we

recommend that you use alkaline

batteries.

House Current

(see Fig. A- )

Connect the AC power adaptor to

DC IN 3V and to a wall outlet. The

AC power adaptor is supplied only

with the TCM-22DV. For other

models, use the AC-E30HG AC

power adaptor not supplied). Do

not use any other AC power

adaptor.

Polarity of

the plug

Note

Specifications for AC-E30HG vary for

each area. Check your local voltage

and the shape of the plug before

purchasing.

Recording system

2-track 1 channel monaural

Tape speed

4.8 cm/s or 2.4 cm/s

Frequency range

250 - 6,300 Hz using nomal TYPE

I) cassette with REC TIME switch

at “NORMAL”)

Speaker

Approx. 3.6 cm 1

in.) dia.

Power output

250 mW at 10 % harmonic

distortion)

Input

Microphone input jack minijack)

sensitivity 0.2 mV for 3 kilohms or

lower impedance microphone

Output

Earphone jack minijack) for 8 - 300

ohms earphone

Variable range of the tape speed

From approx. +30% to –15% with

REC TIME switch at “NORMAL”)

Power requirements

3 V DC batteries R6 AA) × 2/

External DC 3 V power sources

Dimensions (w/h/d) (incl. projecting

parts and controls)

Approx. 112 × 36.6 × 90.3 mm

⁄

× 1

⁄

x 3

⁄

in.)

Mass

Approx. 175 g 6.2 oz.)

Design and specifications are subject

to change without notice.

Ver 1.0 2000. 02

Get user manuals: See SafeManuals.com

– 2 –

TABLE OF CONTENTS

1. SERVICING NOTES............................................... 2

2. GENERAL ................................................................... 3

3. DISASSEMBLY ......................................................... 4

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

5. ELECTRICAL ADJUSTMENTS......................... 8

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 ............................... 19

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0

SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE

DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ

DE FONCTIONNEMENT. NE REMPLACER CES COM-

POSANTS QUE PAR DES PIÈCES SONY DONT LES

NUMÉROS SONT DONNÉS DANS CE MANUEL OU

DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0OR DOTTED

LINE WITH MARK 0ON THE SCHEMATIC DIAGRAMS

AND IN THE PARTS LIST ARE CRITICAL TO SAFE

OPERATION. REPLACE THESE COMPONENTS WITH

SONY PARTS WHOSE PART NUMBERS APPEAR AS

SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

SECTION 1

SERVICING NOTES

In this set, the S102 (POWER) detects REC/PLAYBACK on.

It is mounted on the MAIN board, and therefore the REC/PLAY-

BACK on cannot be detected with the MAIN board removed.

When making an operation check and voltage check of mechani-

cal deck with the MAIN board removed, fix the S102 at turn on.

– MAIN BOARD (Conductor Side) –

S102

Get user manuals: See SafeManuals.com

– 3 –

SECTION 2

GENERAL This section is extracted from

instruction manual.

• Location of Controls

REC TIME

MIC

VOL

BPLAY

MFF/CUE

SPEED CONTROL

EAR VOR

zREC

xSTOP

mREW/

REVIEW

PAUSE

DC IN 3 V

Built-in mic

BATT

Get user manuals: See SafeManuals.com

– 4 –

CABINET (REAR), CASSETTE LID

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

SECTION 3

DISASSEMBLY

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

SET CABINET (REAR), CASSETTE LID MAIN BOARD, MECHANISM DECK (MT-20DV-118) BEL

9cassette lid

INSTALLATION CASSETTE SPRIN

cabinet front

5hand strap

3claw

3four claws

2screw

(IB lock)

4cabinet (rear)

1three screws

(B1.7 ×9)

7boss

6Remove the six solders.

cassette lid

cassette spring

Get user manuals: See SafeManuals.com

– 5 –

MAIN BOARD, MECHANISM DECK (MT-20DV-118)

BELT

6claw

2screw

(1.7)

3screw

(M1.4)

4MAIN board

7mechanism deck

(MT-20DV-118)

5three screws

(IB lock)

1Remove the two solders

electret condenser microphone

(MIC101).

1Remove the two solders

magnetic head (HRP901).

1Remove the two solders

motor (M901).

1belt (capstan)

2belt (FR)

capstan belt

FR belt pulley (FR) assy

flywheel assy

motor DC

Get user manuals: See SafeManuals.com

– 6 –

INSTALLATION MAIN BOARD

On installation MAIN board, adjust to the S101 and

the S102.

screw

(1.7) screw

(M1.4)

MAIN board

S101 (REC/PB)

S102

(POWER)

lever (REC)

Get user manuals: See SafeManuals.com

– 7 –

Mode Torque Meter Meter Reading

4.90 mN•m

FWD CQ-403C (more than 50 g)

(more than 1.76 oz)

Mode Torque Meter Meter Reading

FWD 2.16 - 4.7 mN•m

(22 - 48 g•cm)

CQ-102C (0.31 - 0.67 oz•inch)

FWD 0.05 - 0.29 mN•m

(0.5 - 3 g•cm)

Back Tension (0.007 - 0.04 oz•inch)

FF 4.90 mN•m

CQ-201B (more than 50 g•cm)

REW (more than 0.69 oz•inch)

SECTION 4

MECHANICAL ADJUSTMENTS

Tape Tension Measurement

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

swab:

record/playback head pinch roller

erase head rubber belt

capstan idlers

2. Demagnetize the record/playback head with a head demagne-

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

head.)

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

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage (2.5 V) unless otherwise noted.

Torque Measurement

Get user manuals: See SafeManuals.com

– 8 –

SECTION 5

ELECTRICAL ADJUSTMENTS

Tape Speed Adjustment

Mode: playback

Procedure:

– Normal Speed –

1. Set [REC TIME] switch (S601) to NORMAL (4.8 cm/s) posi-

tion, and playback the tape (WS-48A) .

2. Adjust RV601 so that frequency counter reading becomes 3,040

Hz.

Specification values: 3,030 to 3,050 Hz

– Double Speed –

3. Set [REC TIME] switch (S601) to DOUBLE (2.4 cm/s) posi-

tion.

4. Playback the tape from the beginning for two minutes, then

adjust RV603 so that frequency counter reading becomes 1,540

Hz.

Specification values: 1,535 to 1,545 Hz

Confirm that deflection of the frequency counter reading between

the beginning and the end of tape is within 1% (NORMAL: approx.

30.4 Hz, DOUBLE: approx. 15.4 Hz) .

Adjustment Location:

– MAIN BOARD (Conductor Side) –

Setting:

• Supplied voltage: 2.5 V

• Switch and control position

[VOL ] control (RV101) : mechanical center

[PAUSE ] switch (S105) : OFF

[SPEED CONTROL](RV602): center click

[VOR] switch (S104) : OFF

TestTape

Record/Playback Head Azimuth Adjustment

Mode: playback

Procedure:

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

level meter.

Note: Several peaks may appear, but take the maximum.

2. After the adjustment, lock the adjustment screw with suitable

locking compound.

Adjustment Location:

0 dB=0.775 V

Type Signal Used for

P-4-A063 6.3 kHz, –10 dB Head Azimuth Adjustment

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

level mete

test tape

P-4-A063

(6.3 kHz, –10 dB)

10 kΩ

set

EAR

ack

(

J102

)

–

adjustment screw

Press the N

button.

frequency

counter

test tape

WS-48A

(3 kHz, 0 dB)

10 kΩ

EAR jack (J102)

set +

–

J102 J101

RV601

Tape Speed Adjustment

(Normal Speed)

RV603

Tape Speed Adjustment

(Double Speed)

Get user manuals: See SafeManuals.com

TCM-20DV/21DV/22DV/23DV

– 9 – – 10 –

SECTION 6

DIAGRAMS

6-1. BLOCK DIAGRAM

MIC AMP, REC/PB EQ AMP

IC101 (1/3)

POWER AMP, VOR CONTROL,REGULATOR

IC101 (2/3)

•SIGNAL PATH

: PLAY

: RECORD

GVN OUT

VREF

MIC

VCC

Q106

REC/PB

MONITOR LEVEL

SWITCHING

SP901

(SPEAKER)

POW OUT 1

POW OUT 2

POW IN

REC B+

PB B+

POWER ON B+

BATTERY B+

PB B+

REC B+

PB B+

PRE

OUT

PRE

MIC IN

EQ IN

REC OUT

VREF

S102

(POWER)

S101 (4/6)

S101 (1/6)

HRP901

(REC/PB)

HE901

(ERASE)

Q101

AGC

CONTROL

GVN CONT

GVN VREF

LED

DRIVE 24

PAUSE 22

MUTE

VCC

VOR

DELAY

R/P

REC IN 3

ALC

CONT

J101

MIC

(PLUG IN POWER)

RV101

VOL

J102

EAR

MIC

AMP

POWER

AMP

VOX

REC/PB

PAUSE

MUTE

RIPPLE

FILTER

REFERENCE

VOLTAGE

GENERATOR

REFERENCE VOLTAGE

MUTE SWITCH

Q107, 108

REGULATOR

MOTOR

DRIVER

REC

AMP

ALC

BUFFER

Q102

MUTE

SWITCH

Q109, 110

Q103

REC EQ

SWITCH

Q104

PB EQ

SWITCH

S101

(REC/PB)

REC

S101 (2/6)

(REC/PB)

REC

S101 (5/6)

(REC/PB)

REC

OFF

S101 (3/6)

(REC/PB)

REC

PB B+

Q112

SWITCHING

Q105

VOR OFF

SWITCH

Q111

VOR ON

SWITCH PAUSE .

S105

BATT

D101

OFF

VOR

S104

DRY BATTERY

SIZE “AA”

(IEC DESIGNATION R6)

2PCS. 3V

CN101

DC IN 3V

–+

MIC101

MIC

REC B+

CAPSTAN/REEL MOTOR DRIVE

IC101 (3/3)

VCC B+

M901

(CAPSTAN/REEL) M

RV601

THP602

DOUBLE NORMAL

REC TIME

S601-1

DOUBLE NORMAL

REC TIME

S601-2

SPEED CONTROL

RV602

S101 (6/6)

(REC/PB)

REC

POWER ON B+

THP601

POWER ON

B+

TAPE SPEED

(NORMAL SPEED)

RV601

TAPE SPEED

(DOUBLE SPEED)

RV603

Get user manuals: See SafeManuals.com

TCM-20DV/21DV/22DV/23DV

– 11 – – 12 –

6-2. PRINTED WIRING BOARDS

C140

C110

C121

R610

C126

C108

R137

R110

R114

C145

R119

R109

R108

C144

C146

C148

C107

C141

C106

R103 R102 R105

R106

R134

R130

R601

R603

R131

R132

R104

R118

R112

C112

R113

R111

R133

R129

R122

C136

R101

C102

C103

C132 C142

C149

R142

R606

R607

R609

R602

C114

C116

C109

C134

C143

C101

C147

C117

C118

C119

Q104

Q103

BCE

Q101

BCE

Q106

C111 +

C105 +

C104 +

BCE

MAIN BOARD (CONDUCTOR SIDE)

C125

C123

C127

C128

IC101

C129

C122

C124

C120

RV603

RV601

THP601

THP602

BLK

BRN

RED

BRN

BLK

BRN

M901

(CAPSTAN/REEL)

SP901

(SPEAKER)

HRP901

(REC/PB HEAD)

HE901

(ERASE HEAD)

1-676-966- (11)

1-676-967- 11

DRY BATTERY

SIZE “AA”

(IEC DESIGNATION R06)

2PCS. 3V

CN101

DC IN 3V

+–

S102

(POWER)

Q102

–1

–2

RV101

VOL

MIC101

MIC

BLK

RED

BATT

D101

EAR

J102

J101

MIC

(PLUG IN POWER)

–3

–2

–1

–6

–5

–4

S101

(REC/PB)

REC PB

SW BOARD

MAIN BOARD (COMPONENT SIDE)

R139

R143

R117

R116

C139

R138

R141

R126

R144

R123

C138

R135

R201

R115

R125

C130

R604

R127

C137

R136

C113

Q105

BCE

Q110

Q109

Q107

Q108

BCE

Q112

C133

Q111

BCE

S105

PAUSE

OFF

RV602

SPEED

CONTROL

S104

VOR

OFF L H

1-676-966- (11)

2 3 4 5 6 7 8 9 10 11 12 13 14 15

–2

–1

S601

REC TIME

DOUBLE NORMAL

BLK

BRN

Note on Printed Wiring Boards:

•X: parts extracted from the component side.

•Y: parts extracted from the conductor side.

•z: Through hole.

•b: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

Caution:

Pattern face side: Partson thepattern face sideseenfrom

(Conductor Side) the pattern face are indicated.

Parts face side: Parts on the parts face side seen from

(Component Side) the parts face are indicated.

Ref. No. LocationRef. No. Location

• Semiconductor Location

D101 A-13

IC101 E-11

Q101 D-13

Q102 D-14

Q103 D-10

Q104 D-10

Q105 G-6

Q106 F-9

Q107 F-3

Q108 E-3

Q109 E-3

Q110 F-3

Q111 C-7

Q112 E-2

Get user manuals: See SafeManuals.com

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