Teac A-2340 Manuel utilisateur

A-2340

4CHANNEL

SIMUL-SYNC

STEREO

TAPE

DECK

SERVICE

MANUAL

TEAC

CORPORATION

"970

JAE

gerry

wee

SALES

OFFICE:

SHINJUKU BUILDING

ee:

CALIFORNIA

90640

Bee

Mon

Ses

ron

nate

EUROPEAN

DISTRIBUTOR:

TEAC

EUROPE

N.Y.

TEAC

HONGKONG

LIMITED

ROOM

NO.

1105

KABELWEG

45-47,

AMSTERDAM-W.

MAIN

OFFICE:

MELBOURNE

PLAZA,

QUEEN'S

ROAD

HONG

KONG

HOLLAND

MT2340E100

PRINTED

JAPAN

472E1°S-0050

1.GENERAL

DESCRIPTION

The

TEAC

A-2340

semi-professional

tape

deck

capable

simul-sync

recording,

four

channel,

stereophonic

and

mono-

phonic

recording

and

playback.

offers

operating

speeds

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.

adjustments

repair

procedures

are

not

clear

seem

difficult

accomplish

should

you

desire

detailed

technical

information,

please

contact

your

nearest

TEAC

dealer,

TEAC

Corporation

affiliated

corporations,

ad-

dress's

which

are

printed

this

manual.

INDEX

GENERAL

DESCRIPTION

SERVICE

DATA

EQUIPMENT

REQUIRED

PARTIAL

DISASSEMBLY

HEAD

ALIGNMENT

-MECHANICAL-

MEASUREMENT

AND

ADJUSTMENT

-MECHANICAL-

MEASUREMENT

AND

ADJUSTMENT

-ELECTRICAL-

PREVENTIVE

MAINTENANCE

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%,

(410mm)

7546

(440mm)

SERVICE

DATA

Four

track

channel

stereophonic

Four

track

channel

stereophonic

Four

track

channel

monophonic

Three:

Erase

(Ferrite),

Record,

Playback

(Permalloy)

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%

7-1/2ips

0.15%

3-3/4ips

Wow

and

flutter

measured

according

weighted

NAB

standard

using

TEAC

flutter

free

tape.

Approx.

seconds

less

for

1,200

feet.

Horizontal

and

vertical

100/117/200/220/240

50/60Hz

140W

lbs

(20

kg)

net.

{326mm)

{508mm)

(170mm)

Pnenee,

ELECTRICAL

TRANSISTORS:

DIODES:

FREQUENCY

RESPONSE:

INPUT:

OUTPUT:

SIGNAL

NOISE

RATIO:

BIAS

FREQUENCY:

CROSSTALK

REJECTION:

CHANNEL

SEPARATION:

ERASE

EFFICIENCY:

2SC1000

(BL)

2SC693(GU)

2SA666I(S)

2SC644(T)

2SC828(S)

2SC971

2SC536(F)

FR2-06

FR2-10

7-1/2ips

40Hzv18kHz

+3dB

3-3/4ips

50Hzv10kHz

+3dB

MIC:

0O.3mV/10k2

LINE:

0.1V/100k&

LINE:

approx.

0.3V/10kQ

HEADPHONE:

3mW/82

7-1/2ips

48dB

higher

3-3/4ips

46dB

higher

playback

100*5kHz

push-pull

oscillator

35dB

adjacent

track

100Hz

45dB

channel

1kHz

60dB

7-1/2ips

NOTE

result

continuing

changes

and

improvements

during

the

production

run,

minor

differences

may

found

between

early

and

later

machines.

Refer

manual

change

sheets

for

infor-

mation

concerning

modifications.

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)

Sentinel

FL-3D-1

DIGITAL

FREQ.

COUNTER:

Capable

5kHz

indication

TOOLS:

General,

2mm

nut

driver

#5086014000,

Hex

head,

Allen

wrench

#5086021000

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:

model

4302B

equivalent

RESISTOR:

Non

inductive

type

ohm/1W

OSCILLOSCOPE:

General

purpose

NOTE

Use

the

TEAC

M-826A

test

set

recommendid.

This

set

incorporates

VIVM,

Audio

Oscil—

lator,

Channel

Selecting

switch,

Variable

At-

tenuator,

Monitor

Speaker

and

Cables.

TEAC

M-826A

measures

the

RMS

value

the

Volt-

peau

icessc

age(O

0.775

V).

Characteristics

thi:

Fig.

3-2

TEAC

M-826A

test

set

are

similar

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.

ete

SOU

AWA

AUN

Wood

Sides

Rear

Panel

and

Bottom

Plate

All

amplifier

checks

and

adjustments

can

made

from

the

bottom

with

the

plate

removed.

These

adjustments

should

performed

experienced

technicians,

and

then

only

when

going

through

the

complete

test

and

check

pro-

cedures

the

unit

which

being

tested.

{

HEAD

REPLACEMENT

CAUTION

Power

the

unit

must

switched

off

when

removing

the

heads,

this

will

prevent

transient

pulses

from

passing

through

the

heads

causing

strong

magnetization

damage

the

delicate

windings.

After

head

replacement,

thorough

demagnetization

recommended.

NOTE

The

heads

the

A-2340

can

changed

either

complete

assembly

individually

required.

HEAD

ASSEMBLY

REPLACEMENT

change

the

head

assembly

unit,

remove

the

two

mounting

screws,

(one

each

end).

Note

the

positions

the

wires

the

circuit

board

before

unsoldering.

Solder

the

wires

the

new

assembly

exactly

the

same

positions.

w-olae

Fig.

4-1

Head

Assy

INDIVIDUAL

HEAD

REPLACEMENT

replace

single

head,

special

2mm

nut

driver

required.

Remove

the

two

nuts

the

defective

head

through

the

access

hole

provided,

this

releases

the

head

from

the

mounting

plate.

Note

the

position

the

wires

the

circuit

board.

Connect

the

new

head

the

same

manner.

Replace

the

nuts

securing

the

new

head

the

plate,

perform

head

alignment

before

operation.

Head

installation

mounting

provides

for

left

right

positioning.

After

in-

stalling

heads,

determine

proper

posi-

tion

while

recording

playing

back

tape.

INDIVIDUAL

4CH

HEADS

Fig.

4-2

Individual

Heats

REMOVAL

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)

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

drop

toward

floor

case.

Remove

capstan

belt.

Loosen

two

screws

capstan

assy

flywheel.

Remove

flywheel.

Remove

three

screws

capstan

assy.

Gently

move

capstan

assy

and

down

until

slides

out

panel.

NOTE

clearance

0.01"

must

main-

tained

between

the

flywheel

and

capstan

assembly.

Fig.

4-4

Capstan

Assy

Renoval

REMOVAL

TENSION

ARMS

LEFT

RIGHT

See

illustration

for

complete

disassembly

instructions.

IMPORTANT

After

reassembly

check

clearance

ascertain

that

arm

moves

freely

and

not

binding.

REMOVAL

REEL

MOTOR

ASSY

Loosen

hex

screws

brake

drum,

lift

off

brake

drum.

Remove

screws

securing

the

brake

assembly

the

motor.

Remove

reel

turntable,

remove

screws

securing

motor

front

panel.

NOTE

Reel

motor

assemblies

are

mirror

images

each

other,

these

as-

semblies

are

not

interchangeable.

Fig.

4-5

Reel

Motor

Removal

5.HEAD

ALIGNMENT

—MECHANICAL—

NOTE

Head

alignment

adjusted

the

factory

very

critical

tolerances.

Normally

HEAD

ASSEMBLY

replacement

will

require

only

minor

alignment

adjustments.

Complete

readjustment

should

only

necessary

after

in-

dividual

head

replaced.

The

adjustments

are

made

follows:

ERASE

HEAD

SECTION

The

erase

head

pole

should

above

the

edge

threaded

tape

the

width

heavy

pencil

line.

RECORD

HEAD

SECTION

The

record

head

pole

should

above

the

edge

threaded

tape

the

width

thin

pencil

line.

PLAYBACK

HEAD

The

pole

the

playback

head

should

even

with

the

top

threaded

tape.

AZIMUTH

ADJ.

SCREW

HEIGHT

ADJ.

SCREW

ERASE

RECORD

PLAY

BACK

Fig.

5-1

Head

Alignment

and

Adjustable

Screws.

NOTE

Azimuth

adjustments

are

given

the

section

MEASUREMENTS

and

ADJUSTMENTS

-ELECTRICAL-.

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