Sony TCM-400-DV Service manual

TCM-400DV

SERVICE MANUAL

Ver 1.0 2001.10

SPECIFICATIONS

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 7 /

Power output

250 mW (at 10 % harmonic distortion)

Input

Microphone input jack (minijack) sensitivity 0.2 mV for 3 kΩ or lower impedance microphone

Output

Earphone jack (minijack) for 8 -300 Ω 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) x 2/ External DC 3 V power sources

Dimensions (w/h/d) (incl. projecting parts and controls)

Approx. 86.7 x 114.4 x 35.4 mm (3 1 /2 x 4 5 /8 x 1 7 /16 in.)

Mass

Approx. 160 g (5.7 oz.) (main unit only)

E Model

Chinese Model

Tourist Model

Model Name Using Similar Mechanism New T ape Transport Mechanism T ype MT-400-175

in.) dia.

9-873-336-01

Design and specifications are subject to change without notice.

CASSETTE-CORDER

Sony Corporation

Personal Audio Company Published by Sony Engineering Corporation

TCM-400DV

SECTION 1

GENERAL

TABLE OF CONTENTS

1. GENERAL ................................................................... 2

2. DISASSEMBLY ......................................................... 3

3. MECHANICAL ADJUSTMENTS....................... 5

4. ELECTRICAL ADJUSTMENTS......................... 6

5. DIAGRAMS

5-1. Block Diagrams...................................................... 7

5-2. Printed Wiring Board –MAIN Board – ................. 8

5-3. Schematic Diagram ................................................ 9

5-4. Printed Wiring Board –LED Board – .................... 10

5-5. IC BLOCK DIAGRAMS....................................... 10

6. EXPLODED VIEWS................................................ 11

7. ELECTRICAL PARTS LIST ............................... 15

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.

REC STOP

REW/ REVIEW

PAUSE

VOL

This section is extracted from instruction manual.

EAR

TAPE COUNTER

MIC

VOR Flat mic

REC

REC TIME

DC IN 3V

SPEED CONTROL

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

SECTION 2

)

DISASSEMBLY

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

Cassette holdr ASSY LED board

Set

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

2-1.CABINET (REAR), CASSETTE HOLDER ASSY

Cabinet(rear) MAIN Board,Mechanism Deck

Belt (cap), belt (pulley), M901 (capstan/reel motor), HRP901 (REC/PB head), HE901 (erase head)

TCM-400DV

Cassette holder ASSY

Claws

Screws (B1.7X9)

Spring (cassette)

Flexible board (CN901

Cabinet (front)

Claw

Claws

Strap, hand

Screws (B1.7X9)

Cabinet (rear)

TCM-400DV

2-2. LED BOARD

Cassette holder Assy

Freame (cassette holder)

2-3. MAIN BOARD, MECHANISM DECK

Screws (IB lock)

Screws(1.7)

Screw(1.7)

LED board

Flexible board

Knob (pause)

Lever (pause)

Note:

To install, position the Knob (pause) and the lever (pause) respectively.

Remove solder

(two places)

Remove solder

(four places)

Cabinet (front)

Mechanism dec

Main board

Screws (M1.4)

2-4. BELT (CAP), BELT (PULLEY), M901 (CAPSTAN/REEL MOTOR),

HRP901 (REC/PB head)

Attaching belt (CAP) and belt (pulley)

Belt (CAP)

Belt (pulley)

Screws (M1.4)

M901 (Capstan/reel motor)

Fly ASSY, capstan

Washer

Washer (stopper N)

Screws

HE901 (Erase head)

Screw

HRP901 (REC/PB HEAD), HE901 (ERASE HEAD)

TCM-400DV

MECHANICAL ADJUSTMENTS

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

record/playback head pinch roller erase head rubber belt capstan

2. Demagnetize the record/playback 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. 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.

SECTION 3

Torque Measurement

FWD (20 – 40 g•cm)

Forward Back Tension

FF, REW CQ-201B

Tape T ension Measurement

Mode Torque Meter Meter Reading

1.97 – 3.92mN•m

CQ-102C

Mode Tension Meter Meter Reading

FWD CQ-403A

(0.28 – 0.55 oz•inch)

0.05 – 0.49 mN•m (0.5– 5 g•cm)

(0.007 – 0.069 oz•inch)

more than 4.91 mN•m

(more than 50 g•cm)

(more than 0.69 oz•inch)

more than 50 g

(more than 1.76 oz)

TCM-400DV

ELECTRICAL ADJUSTMENTS

Setting:

• Supplied voltage: 2.5 V

• Switch and control position VOL contorl (RV101) : mechanical center PAUSE switch (S601) : OFF SPEED CONTROL (RV603): center click VOR switch (S901) : OFF

Test T ape

Type Signal Used for

WS-48A 3 kHz, 0 dB tape speed adjustment

0 dB=0.775 V

SECTION 4

Tape Speed Adjustment

Mode: playback

test tape WS-48A (3 kHz, 0 dB)

32 Ω

set

EAR jack (J101)

frequency counter

+ –

Procedure:

1. Set [REC˚TIME] switch (S902) to NORMAL (4.8 cm/s) posi-

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

2. Adjust RV601 so that frequency counter reading becomes 3,000 Hz.

Specification values: 2,990 to 3,010 Hz

3. Set [REC˚TIME] switch (S902) to DOUBLE (2.4 cm/s) posi- tion.

4. Playback the tape from the beginning for two minutes, then adjust R V602 so that frequency counter reading becomes 1,500 Hz.

Specification values: 1,495 to 1,505 Hz

Confirm that deflection of the frequency counter reading between the beginning and the end of tape is within 2% (NORMAL: approx. 60 Hz, DOUBLE: approx. 30 Hz) .

Adjustment Location:

– MAIN BOARD (Conductor Side) –

RV602 Tape Speed Adjustment (Double Speed)

RV601 Tape Speed Adjustment (Normal Speed)

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