Sony TCM-323 - Micro Portable Recorder Bedienungsanleitung

SERVICE MANUAL

CASSETTE-CORDER

US Model

Canadian Model

AEP Model

E Model

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MT-323-118

SPECIFICATIONS

TCM-323

Ver 1.2 2004.03

9-923-304-12 Sony Corporation

2004C05-1 Personal Audio Company

– 2 –

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.

SECTION 1

SERVICING NOTES

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.

[MAIN BOARD] (Conductor Side)

IC101

IC102

IC601

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. Schematic Diagram ......................................................... 11

6-3. Printed Wiring Board ...................................................... 13

7. EXPLODED VIEWS................................................ 14

8. ELECTRICAL PARTS LIST ............................... 17

– 3 –

SECTION 2

GENERAL This section is extracted from

instruction manual.

– 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.

cassette lid

cassette spring

strap

claw

four claws

screw

(IB lock)

cabinet (rear)

three screws

(B1.7

boss

Remove the two solders

speaker cords.

SET CABINET (REAR), CASSETTE LID MAIN BOARD, MECHANISM DECK (MT-323-118)

BELT

– 5 –

MAIN BOARD, MECHANISM DECK (MT-323-118)

BELT

claw

screw

(1.7)

screw

(M1.4)

MAIN board

mechanism deck

(MT-323-118)

three screws

(IB lock)

Remove the two solders

electret condenser microphone

(MIC901).

Remove the two solders

magnetic head (HRP901).

Remove the two solders

motor (M901).

belt (capstan)

belt (FR)

– 6 –

INSTALLATION MAIN BOARD

On installation MAIN board, adjust to the S101 and

the S102.

screw

(1.7) screw

(M1.4)

MAIN boar

S101 (REC/PB)

S102

(POWER)

lever (REC)

– 7 –

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 (2.5V) unless otherwise noted.

Torque Measurement

Mode Torque Meter Meter Reading

FWD more than 20 g•cm

CQ-102C (more than 0.28 oz•inch)

Forward Back Tension 0.5 - 3 g•cm

(0.007 - 0.04 oz•inch)

FF CQ-201B more than 50 g•cm

REW (more than 0.69 oz•inch)

Mode Tension Meter Meter Reading

FWD CQ-403C more than 50 g

(more than 1.76 oz)

– 8 –

SECTION 5

ELECTRICAL ADJUSTMENTS

Precaution

• Supplied voltage: 2.5 V

• Switch and control position

PAUSE switch (S105): OFF

VOL (RV101): mechanical mid

TestTape

Record/Playback Head Azimuth Adjustment

Procedure:

Mode: playback

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

Tape Speed Adjustment

Procedure:

Mode: playback

1. Play back WS-48A (tape end part) and adjust RV601 so that

the frequency counter reading becomes 3,000 ± 15 Hz.

2. Play back WS-48A tape the beginning and the end part, check

that the frequency counter reading is within same standard of

step1.

Adjustment Location:

[MAIN BOARD] (Conductor Side)

level mete

test tape

P-4-A063

(6.3 kHz, –10 dB) 10 k

Ω

set

EAR jack

–

frequency

counter

Standard tape for adjusting

WS-48A

(3 kHz, 0 dB) 10 k

Ω

EAR jack

set

–

Type Signal Used for

P-4-A063 6.3 kHz, –10 dB head azimuth adjustment

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

IC101

IC601

RV601

adjustment screw

Ver 1.2

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