Sony TCM-8EV Manuel utilisateur

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INCLUDES SUPPLEMENT AT

END OF THIS SECTION

SERVICE

MANUAL

Model

Canadian Model

AEP

Model

E Model

Reco

rding

system

Fast

winding

time

Frequency response

Tape speed

Speaker

Power

output

Input

Output

Power

requirements

CORDING

vo1CE·OPERATED

•

SPECIFICATIONS

track

1-channel

monaural

Battery

life

Approx.

min.

with

Sony

Cassette Batteries

HF60

Apricable serial number

for

model

for

Canadian model

for

AEP model

for

E model

10,001

11,500

10,001

10,300

10,301

11,100

11,101

12,200

ITape Transport Mechanism Type !

MT-6-06 !

Recording

Playback

200-8,000

(EIAJ)

200-4,000

(VOR)

Sony

New

Super 2.5

2.5

4.8 cm/sec (1

ips)

~fg

adjustable

playback

Approx.

4.5

inches)

dia

350mW

SUM-3(NS)

batteries

Sony

Eveready

AM3

6 6

Alkaline

batteries

Microphone

input

jack

(minijack)

Dimensions

(hours)

Approx

90.8

133

31.7

(w/h

/d)

including

projecting

parts and

controls

Approx.

300

including

batteries

sensitivity

0.2

(-72

dB)

for

low

impedance

microphone

Weight

Earphone

jack

(minijack)

for

8-ohm

earphone

load

impedance

kilohms

higher

3 V de, 2 batteries

IEC

designaiton

(size

AA)

120

V ac,

with

optional

Sony

AC-30

power

adaptor

(US, Canadian

Model)

220,

240

ac,

with

optional

Sony

AC-37

power

adaptor

(AEP,

Model)

110

120,

220

240

adjustable

with

optional

Sony

AC-92

power

adaptor

Model)

V car

batte

with

optional

Sony

DCC-127A car

battery

cord

CASSETTE

CORDER

SONY:

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TCM-SEV

Chip components

Chip components include resistors, capacitors, transistors,

diodes, coil and acijustable resistors.

In this section, the types

resistors, ceramic capacitors,

transistors and diodes which are used most frequently will

be described.

Dimension

transistors and capacitors

Identification

resistor layer side

(black

color}

Type

3216

2125

narrow

electrode

1~1.5

ceramic

base

side

(white

color}

Resistor

~2.9

3.2

1.6

2.0

(Unit

mm)

0.45

0.6

0.5

electrodes

Laminated Ceramic Capacitor

~2.9

◄

►

◄

2 3 1 2 3 1 2

Transistor

Diode

-2-

•

◄

3 1

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•

Replacing chip components

All

chip c

omponents

should be

connected

and disconnect-

ed, using a tapered soldering iron [

temperature

the

iron

tip: less

than

280

°C

(536

F)]

, a pair

tweezers and braid-

ed wire.

Precautions

for

replacement

not disconnect the chip component forcefully.

Otherwise, the pattern may peel off.

Never re-use a disconnected chip component. Dispose

all old chip components.

protect the chip component, heating time for attach-

ing

the component should be within 3 seconds.

o Removing chip components

(1)

Removing solder

electrode

Remove

the

solder

the

electrode, using a

thin

braided wire. Do

not

remove

the

solder

the

part

(chip

component)

attached

adjacent

the

electrode.

Pattern Soldering iron

(2)

Disconnecting chip components

Turn

the

tweezers with

the

soldering iron alternately

applied

both

electrodes, and

the

chip

component

will be disconnected. Take careful precautions while

disconnecting, because

the

chip

component

is force-

fully removed

the

land

may

peel

off

Never re-use a disc

onnected

chip c

omponent

TCM-SEV

(3)

Smoothing the soldered surface

After disconnecting

the

chip

component

, remove

the

solder

using a braided wire

sinooth

the

land

surface.

o Connecting chip components

The value

chip

components

not

displayed

the

main

body.

Take due precautions

avoid mixing new

chip

components

with

other

ones.

(1)

Applying solder

land

one side

Apply a

thin

layer

solder

the

land

one

side

where

the

chip

component

be connected. Too

much

solder may cause bridging.

(2)

Speedy soldering

Hold

the

chip

component

the

desired position,

using tweezers, and apply

the

soldering iron in

the

arrow-marked direction. To

protect

the

chip compo-

nent

, heating time should be within 3 seconds.

Land

Printed circuit

board

(3)

Speedy soldering

electrode on the other side

Solder

the

electrode on

the

other

side in

the

same

way as in

(2)

above.

- 3-

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TCM-SEV

Parts identification

lL~

Features

•

Voice

operated

recording

Recording

starts

automatically

when

detecting

the

sound stronger

than

some

extent

and stops

when

sound

applied.

•

Extremely

compact

size

for

easy one-hand

operation.

•

Simplicity

recording -

merely

insert a cassette and depress a

single

button

•

TONE

switch

adjust

the

tone

the

playback

mode

and

the

built·

microphone

sensitivity

the

record

mode

•

Adjustable

tape speed

playback

mode

• Cue and review

functions

quickly

locate any desired

portion

the

tape.

• One

touch

review

function

facilitates

listening

the

just

recorded

program.

•

Tap

counter

for

indexing

the

tape contents.

•

Automatic

shut

off

mechani

activates at

the

end

the

tape in

either

the record

playback

mod

VOR

selector

SPEED

CONTROL

knob

PAUSE

switch

FF/CUE

button

REW/

REVIEW

button

PLAY

button

0 STOP/

EJECT

button

REC

button

REC/BATT

indicator

CD)

VOR

indicator

MIC

jack

- 4-

EAR

jack

41}

TONE

switch

41)

Tape

counter

and Reset

button

VOLUME

knob

jack

Bui

lt-in

microphone

Cassette

compartment

Battery

compartment

(Rear)

Speaker (Rear)

Hand

Strap

•

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,...__

JIOI

[Mfg~

HRP

REC/PB

HEAD

4-3

REC-

BIAS

OSC

LOW

PASS

FILTER

0201

CLOCK

PULSE

osc

IC3011

13VI

REC

AMP

103

CLOCK

PULSE

INVERTER

SHAPER

510

4-4

REC-

CLOCK

PULSE

INVERTER

SHAPER

0205

SI04

-2

REC-PB

B+

LINE

AMP

ICI

(1/ 31

BBQ

AMP

5301-1

®ID

LOW

f'IISS

FILTER

0202

VOR

SENgTvlTY

SWITCH

0306

,,,,

010I

•

!REC/BATT!

5101

o.[!Q@

-H

B+

-YVOR

TCHING

030B

VOR

AMP

RVIOI

~Jl02

i='™

,,,,

0301

§ID

_l__,

LEO

DRIVE

0304

~,1

S10

REC-

OFF

-ON

VOR

SWITCHING

0303

VOR

ITCHI

qr!

VOR

ICOMPARTERI

CONTRCX.

IC30I(1/2)

0305

MCT<Jl

B+

ORY

BATTERY

.r-1

SIZ

"AA"

IIEC

DESIGNIITION

RGI

2PCS,3V

,...

C')

::c

(J)

("")

-I

-0

z z

-II

....

I'll

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TCM-SEV

SECTION 2

CIRCUIT

DESCRIPTION

CIRCUIT DESCRIPTION

This set utilizes a

BBD

(Bucket

Brigade Device) IC

order

prevent

the

beginning

audio

from

being

recorded

brokenly

during

VOR

recording

, by delay-

ing

the

audio

signal.

Fig. 1

a block diagram

the

audio

signal delay.

The audio signal is

output

from IC101

pin@

passes

the

R201,

202

attenuator

and

Q201

low

pass

filter,

and

input

IC201

The

R201 ,

202

attenuator

attenuates

the

signal so

that

it does

not

go over IC201

maximum

input

level

about

-SdB.

LOW PASS

FILTER

0201

AUDIO

SIGNAL

DELAY

IC201

Q201

low

pass filter

operates

cut-off

frequency

4kHz

that

it does

not

over

the

clock pulse and

beat

which

operate

IC201 ,

202.

IC201 ,

202

form an

audio

signal delay 1024-stage

BBD

IC.

this set,

these

two

ICs delay

about

85msec

. The delayed

signal has

the

amount

attenuated

R201,

202

amplified

Q203, it passes

Q202

low

pass filter

and

input

102

, 103 recording

amp

Q202

low pass

filter

cut

the

clock

pulse so

that

not

super-

imposed

the

signal

the

BBD IC.

AUDIO

SIGNAL

DELAY

AMPLIFIER

0203

LOW PASS

FILTER

0202

RECORD

AMPLIFIER

0102

. 103

IC202

Fig.

Audio signal delay block diagram

--Pig.

2 shows

the

circuit

which

controls

and

off

the

motor

and bias oscillation during

VOR

record-

ing. The

audio

signal

output

from

ICl0l

pin @

amplified

Q301 . When

the

level

the

audio

signal

input

Q301 is large,

Q302

base

potential

drops

and

Q302

goes

. When this

happens,

IC301

pinG)

voltage goes higher

than

and

goes high.

Then

Q305

303

turn

, and

supply

power

servo

(IC601)

and bias oscillation

transistor

(Ql0l).

Q306

transistor

for switching

VOR

recording

sensitivity,

and

when

VOR

recording

sensitivity is

low

turns

and

attenuates

the

audio

signal

input

Q301.

Also,

when

there

audio

signal from

the

microphone,

and

the

motor

bias oscillation is

stopped

immediately,

the

last

audio

not

recorded

(the

audio

signal

delayed

about

85msec for

VOR

recording), and

further,

off

repeated

too

short

intervals,

the

playback

sound

will be hard

heas, so

maintains

IC301

high for

about

2- 3 sec

onds

prevent

this.

B+ B+

c--

HEAD

AUDIO

SIGNAL

0303

MOTOR

SERVO

0306

2SCl623

V0R

SENSITIVITY

SWITCH

0301

2SC623

V0R

AMP

005

003

R305

001

llk

R307

308

470,

0302

2SAll62

V0R

TCHING

R310

I0k

+ C304

4.7

IC3011l/2l

NJM2903M

V0R

WITCHING

MFIIRTER

Fig.

Motor,

Bias

oscillator control circuit

-6-

2SAll62

BIAS

OSCILLATOR

0303

V0R

ITC

HIN

CIRCUIT

0305

2SCl623

NTR

•

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•

SECTION 3

DISASSEMBLY

Note

the

disassembly

procedure

the

numerical

order

given.

REAR

CABINET

+PTP1.l x 6

(TYPE

+PTP1.l

x 6

(TYPE

Remove

the

rear

cabinet.

+PTP1.7 x 5

(TYPE

Remove

the

control

panel.

TCM-SEV

+PTP1.7 x 6

(TYPE

+PTP2

(TYPE

NON-SLIT)

Remove

the

battery

lid

AUDIO

BOARD

+PTP1.4

Unlock.

-7-

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TCM-SEV

CASSETTE

LID

Pull

out

the cassette

shaft in the direction

shown

the arrow.

VOR

BOARD,

BBD

BOARD, SPEED

CONTROL

BOARD

VOR board

- 8-

Remove the cassette lid.

Remove the toggle arm from

the cassette lid.

+81.4

speed control board

•

www.SteamPoweredRadio.Com

•

TCM-SEV

MECHANISM SECTION

+PTPT.7

x 6

(TYPE

RECORD/PLAYBACK HEAD, PINCH LEVER presisi

screws

lug

washer

record

playback

head

pinch

lever

'--

head

spacer

- 9-

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TCM-8EV

SECTION 4

ADJUSTMENTS

4-1.

MECHANICAL

ADJUSTMENTS AND

MEASUREMENT

PRECAUTION

I. Clean

e following

parts

with a de

natured-

alcohol-moistened swab:

rec

ord

playback

head

erase head

capstan

pinch

roller

rubber

belts

idlers

2. Demagnetize

the

record

playback

head

with

head

demagnetizer.

(Do

not

bring

the

head

de-

magnetizer

the

erase

head.)

3. Do

not

use a magnetized screwdriver for

the

adjustments

After

the

adjustments,

apply

suitable Jocking

ompound

the

parts

adjusted.

power

upply

voltage : 3V de

SPEED

CONTROL

knob:

center

click

Torque Measurement

Torque

Meter

Reading

Forward 27 -

g-c

(0.37 - 0.66 oz-inch)

Fast

Forward

55 -

-cm

and Rewind (0.76 -1.03 oz

-in

ch)

Back Tension 2 - 4 g

-c

0.027 - 0.055 oz

-in

ch)

Tape

Tension Measurement

Meter

Meter Reading

Torque Meter

CQ-102C

CQ-201B

CQ-102C

The

adjustments

should

performed

with

the

rated

power

supply

voltage

unle

otherwise

noted.

CQ-403A More than 100 g (3.53 oz)

Head

Height Adjustment

power

supply

voltage:

Procedure:

Prepare an

adjustment

cassette as

shown

below.

tape cassette

Cut

out

hatched

portions.

record

mode

and viewing from

the

front,

adjust

the

head heights

eliminate

tape

curl

and

tape

twist

arrowed

portions.

erase

head

record/playback

head

~-Fl

'"'Ejj -

3-578-138-01 (t=0.1)

3-578-138-11 (t=0.2)

Shim,

head

height

adjustment

(-'1

11~

-10

•

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