Teac A-2340 Manuale utente

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1

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A-2340

4CHANNEL

SIMUL-SYNC

STEREO

TAPE

DECK

SERVICE

MANUAL

TEAC

CORPORATION

=

'

"970

JAE

gerry

op

wee

SALES

OFFICE:

SHINJUKU BUILDING

ee:

CALIFORNIA

90640

Bee

es

Mon

Ses

OP

ron

nate

eR

EUROPEAN

DISTRIBUTOR:

TEAC

EUROPE

N.Y.

TEAC

HONGKONG

LIMITED

ROOM

NO.

1105

KABELWEG

45-47,

AMSTERDAM-W.

2

MAIN

OFFICE:

MELBOURNE

PLAZA,

33

QUEEN'S

ROAD

C.

,

,

HONG

KONG

HOLLAND

MT2340E100

PRINTED

IN

JAPAN

472E1°S-0050

1.GENERAL

DESCRIPTION

The

TEAC

A-2340

is

a

semi-professional

tape

deck

capable

of

simul-sync

recording,

four

channel,

stereophonic

and

mono-

phonic

recording

and

playback.

It

offers

operating

speeds

of

7~1/2ips

and

3-3/4ips.

This

service

manual

provides

adjustment

and

alignment

pro-

cedures,

schematic

diagrams

and

parts

replacement

informa-

tion

and

the

proper

procedures

for

obtaining

necessary

repair

parts.

If

adjustments

or

repair

procedures

are

not

clear

or

seem

difficult

to

accomplish

or

should

you

desire

more

detailed

technical

information,

please

contact

your

nearest

TEAC

dealer,

TEAC

Corporation

or

affiliated

corporations,

ad-

dress's

of

which

are

printed

in

this

manual.

INDEX

1.

GENERAL

DESCRIPTION

2.

SERVICE

DATA

3.

EQUIPMENT

REQUIRED

4.

PARTIAL

DISASSEMBLY

5.

HEAD

ALIGNMENT

-MECHANICAL-

6.

MEASUREMENT

AND

ADJUSTMENT

-MECHANICAL-

7.

MEASUREMENT

AND

ADJUSTMENT

-ELECTRICAL-

8.

PREVENTIVE

MAINTENANCE

9.

TROUBLE

SHOOTING

10.

PACKING

FOR

SHIPMENT

SCHEMATIC

DIAGRAMS

PRINTED

CIRCUIT

BOARD

AND

PARTS

LIST

EXPLODED

VIEW

AND

PARTS

LIST

MANUAL

CHANGES

MECHANICAL

TYPE:

HEADS:

REEL

SIZE:

TAPE

WIDTH:

TAPE

SPEED:

MOTORS:

WOW AND

FLUTTER:

FAST

WINDING

TIME:

OPERATING

POSITION:

POWER

REQUIREMENTS:

WEIGHT:

20%,

19

(410mm)

7546

(440mm)

2.

SERVICE

DATA

Four

track

4

channel

stereophonic

Four

track

2

channel

stereophonic

Four

track

1

channel

monophonic

Three:

Erase

(Ferrite),

Record,

Playback

(Permalloy)

7"

maximum

NAB

reel

Standard

1/4

inch

tape

7-1/2ips

and

3-3/4ips

Two

6-pole

eddy

current

motors

for

reel

drive.

4/8

pole

hysteresis

synchronous

capstan

motor.

0.12%

at

7-1/2ips

0.15%

at

3-3/4ips

Wow

and

flutter

measured

according

to

weighted

NAB

standard

using

TEAC

flutter

free

tape.

Approx.

90

seconds

or

less

for

1,200

feet.

Horizontal

and

vertical

100/117/200/220/240

V

Ac

50/60Hz

140W

44

lbs

(20

kg)

net.

20

{326mm)

{508mm)

(170mm)

Pnenee,

ELECTRICAL

TRANSISTORS:

DIODES:

FREQUENCY

RESPONSE:

INPUT:

OUTPUT:

SIGNAL

TO

NOISE

RATIO:

BIAS

FREQUENCY:

CROSSTALK

REJECTION:

CHANNEL

SEPARATION:

ERASE

EFFICIENCY:

2SC1000

(BL)

x

2

2SC693(GU)

x

4

2SA666I(S)

x

2

2SC644(T)

x

2

2SC828(S)

x

10

2SC971

x

2

2SC536(F)

x

2

FR2-06

x

4

FR2-10

x

4

7-1/2ips

40Hzv18kHz

+3dB

3-3/4ips

50Hzv10kHz

+3dB

MIC:

0O.3mV/10k2

LINE:

0.1V/100k&

LINE:

approx.

0.3V/10kQ

or

more

HEADPHONE:

0.

3mW/82

7-1/2ips

48dB

or

higher

3-3/4ips

46dB

or

higher

at

playback

100*5kHz

push-pull

oscillator

35dB

or

more

adjacent

track

at

100Hz

45dB

or

more

channel

to

channel

at

1kHz

60dB

or

more

at

7-1/2ips

NOTE

As

a

result

of

continuing

changes

and

improvements

during

the

production

run,

minor

differences

may

be

found

between

early

and

later

machines.

Refer

to

manual

change

sheets

for

infor-

mation

concerning

modifications.

3.

EQUIPMENT

REQUIRED

FOR

MECHANICAL

MEASUREMENT

SPRING

SCALE:

Ov4kg

(08

lbs)

#5086025000

0%300¢g(0V10

oz)

#5086026000

TEST

TAPE:

TEAC

YIT-2003

(7-1/2ips)

TEAC

YTT-2002

(3-3/4ips)

FLUTTER

METER:

Meguro

Model

MK665B

(preferred)

or

Sentinel

FL-3D-1

DIGITAL

FREQ.

COUNTER:

Capable

of

0

to

5kHz

indication

TOOLS:

General,

2mm

nut

driver

#5086014000,

Hex

head,

Allen

wrench

#5086021000

ee

ce

Fig.

3-1

Spring

Scale,

Allen

Wrench

and

TEAC

Test

Tape

FOR

ELECTRICAL

MEASUREMENT

TEST

TAPE:

TEAC

YTT-1003

for

7-1/2ips

TEAC

YTT-1002

for

3-3/4ips

SCOTCH

203

and

150

for

test

recording

EMPTY

REEL:

TEAC

RE-702

(2"

hub)

TEAC

RE-701

(4"

hub)

TEST

SET:

|

TEAC

M-826A

test

set

BAND

PASS

FILTER:

TEAC

M-206A(1kHz)

VTIVM:

hp

model

4302B

or

equivalent

RESISTOR:

Non

inductive

type

8

ohm/1W

OSCILLOSCOPE:

General

purpose

NOTE

Use

of

the

TEAC

M-826A

test

set

is

recommendid.

This

set

incorporates

an

AC

VIVM,

Audio

Oscil—

lator,

Channel

Selecting

switch,

Variable

At-

tenuator,

Monitor

Speaker

and

Cables.

TEAC

M-826A

measures

the

RMS

value

of

the

Volt-

peau

icessc

oe

age(O

dB

=

0.775

V).

Characteristics

of

thi:

Fig.

3-2

TEAC

M-826A

test

set

are

similar

to

the

standard

VU-meter.

4.PARTIAL

DISASSEMBLY

R-9

R-2

R-1

LEFT REEL

MOTOR

R-3

CAPSTAN

SOLENOID

CAPSTAN

MOTOR

CAPSTAN

FLYWHEEL

M-0236

—REAR—

Tape

Transport

Parts

Location

REMOVING

WOODEN

SIDES

AND

REAR

PANEL

See

illustration

for

complete

disassembly

instructions.

1

as

ete

Hi

SOU

rh

AWA

!

AUN

Wood

Sides

Rear

Panel

and

Bottom

Plate

All

amplifier

checks

and

adjustments

can

be

made

from

the

bottom

with

the

plate

removed.

These

adjustments

should

be

performed

by

experienced

technicians,

and

then

only

when

going

through

the

complete

test

and

check

pro-

cedures

on

the

unit

which

is

being

tested.

|

{

|

.

:

HEAD

REPLACEMENT

CAUTION

Power

to

the

unit

must

be

switched

off

when

removing

the

heads,

this

will

prevent

transient

pulses

from

passing

through

the

heads

causing

strong

magnetization

or

damage

to

the

delicate

windings.

After

head

replacement,

thorough

demagnetization

is

recommended.

NOTE

The

heads

of

the

A-2340

can

be

changed

either

as

a

complete

assembly

or

individually

as

required.

HEAD

ASSEMBLY

REPLACEMENT

To

change

the

head

assembly

as

a

unit,

remove

the

two

mounting

screws,

(one

on

each

end).

Note

the

positions

of

the

wires

on

the

circuit

board

before

unsoldering.

Solder

the

wires

of

the

new

assembly

in

exactly

the

same

positions.

w-olae

Fig.

4-1

Head

Assy

INDIVIDUAL

HEAD

REPLACEMENT

We

To

replace

a

single

head,

a

special

2mm

nut

driver

is

required.

Remove

the

two

nuts

on

the

defective

head

through

the

access

hole

provided,

this

releases

the

head

from

the

mounting

plate.

Note

the

position

of

the

wires

on

the

circuit

board.

Connect

the

new

head

in

the

same

manner.

Replace

the

nuts

securing

the

new

head

to

the

plate,

perform

head

alignment

before

operation.

Head

installation

mounting

provides

for

left

or

right

positioning.

After

in-

stalling

heads,

determine

proper

posi-

tion

while

recording

or

playing

back

a

tape.

INDIVIDUAL

4CH

HEADS

Fig.

4-2

Individual

Heats

REMOVAL

OF

REMOVAL

OF

Te

2.

CAPSTAN

MOTOR

.

Remove

the

three

screws

hold-

ing

the

capstan

motor.

.

Unsolder

the

six

wire

connect-

ing

the

capstan

motor.

.

Remove

the

four

screws

holding

the

capstan

motor.

-

Loosen

the

two

set

screws

(hex

head)

in

pulley

and

lift

off

pulley.

M-o1at

Fig.

4-3

Capstan

Motor

Removal

CAPSTAN

ASSY

Unscrew

capstan

cover

(front

panel).

Remove

two

screws

from

rear

bracket,

allow

bracket

to

drop

toward

floor

of

case.

Remove

capstan

belt.

Loosen

two

screws

in

capstan

assy

flywheel.

Remove

flywheel.

Remove

three

screws

in

capstan

assy.

.

Gently

move

capstan

assy

up

and

down

until

it

slides

out

of

panel.

NOTE

A

clearance

of

0.01"

must

main-

tained

between

the

flywheel

and

capstan

assembly.

Fig.

4-4

Capstan

Assy

Renoval

REMOVAL

OF

TENSION

ARMS

LEFT

&

RIGHT

See

illustration

for

complete

disassembly

instructions.

IMPORTANT

After

reassembly

check

clearance

to

ascertain

that

arm

moves

freely

and

is

not

binding.

REMOVAL

OF

REEL

MOTOR

ASSY

1.

Loosen

2

hex

screws

in

brake

drum,

lift

off

brake

drum.

2.

Remove

3

screws

securing

the

brake

assembly

to

the

motor.

3.

Remove

reel

turntable,

remove

4

screws

securing

motor

to

front

panel.

NOTE

Reel

motor

assemblies

are

mirror

images

of

each

other,

these

as-

semblies

are

not

interchangeable.

Fig.

4-5

Reel

Motor

Removal

5.HEAD

ALIGNMENT

—MECHANICAL—

NOTE

Head

alignment

is

adjusted

at

the

factory

to

very

critical

tolerances.

Normally

HEAD

ASSEMBLY

replacement

will

require

only

minor

alignment

or

adjustments.

Complete

readjustment

should

only

be

necessary

after

an

in-

dividual

head

is

replaced.

The

adjustments

are

made

as

follows:

ERASE

HEAD

SECTION

The

erase

head

pole

should

be

above

the

edge

of

a

threaded

tape

by

the

width

of

heavy

pencil

line.

RECORD

HEAD

SECTION

The

record

head

pole

should

be

above

the

edge

of

a

threaded

tape

by

the

width

of

a

thin

pencil

line.

PLAYBACK

HEAD

The

pole

of

the

playback

head

should

be

even

with

the

top

of

a

threaded

tape.

@P

&

AZIMUTH

ADJ.

SCREW

@%

HEIGHT

ADJ.

SCREW

ERASE

RECORD

PLAY

BACK

Fig.

5-1

Head

Alignment

and

Adjustable

Screws.

NOTE

Azimuth

adjustments

are

given

in

the

section

on

MEASUREMENTS

and

ADJUSTMENTS

-ELECTRICAL-.