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wt

TEAC

CORPORATION

51032380

1.

GENERAL

DESCRIPTION

The

TEAC

A-3440

is

a

4

channel,

multi-track

open

reel

tape

deck

which

operates

at

15

ips

and

7-1/2

ips.

The

A-3440

is

a

development

of

the

well

known

A3340S

and

shares

many

features

in

common.

Specifically,

the

transport

section

is

virtually

the

same

though

there

has

been

extensive

redesign

of

the

controls

and

the

electronics.

The

FUNCTION

SELECT

switches,

together

with

the

OUTPUT

SELECT

switches

provide

instant

selection

of

source,

sync

and

normal

off-tape

monitoring.

There

is

a

rear

panel

interface

for

the

RX-9

DBX

noise

reduction

unit,

the

use

of

which

will

greatly

improve

the

dynamic

range

and

signal

to

noise

performance

of

the

deck.

The

A-3440

is

ideally

suited

to

the

requirements

of

the

musician

and

multi-track

recordist.

If

any

of

the

procedures

in

this

manual

are

not

sufficiently

clear,

or

seem

too

difficult

to

undertake,

we

suggest

you

contact

your

nearest

TEAC

Factory

Service

Department

or

write

directly

to

the

TEAC

Corpo-

ration.

TEAC

addresses

are

printed

on

the

back

cover

of

this

manual.

—

TABLE

OF

CONTENTS

—

1.

GENERAL

DESCRIPTION

................

3

2.

SPECIFICATIONS

AND

SERVICE

DATA.....

4

3.

TOOLS

FOR

TESTING

AND

MAINTENANCE

.

5

4.

PARTIAL

DIS-ASSEMBLY

................

6

5.

TAPE

TRANSPORT

PARTS

LOCATION......

9

—

Rear

View

—

6.

HEAD

REPLACEMENT

AND

ALIGNMENT

...

10

—

Mechanical

—

7.

MEASUREMENT

AND

ADJUSTMENT

.......

12

—

Mechanical

—

8.

MEASUREMENT

AND

ADJUSTMENT

.......

16

—

Electrical

—

9.

SERVICING

AND

MAINTENANCE

.........

23

10.

SIMPLIFIED

SCHEMATIC

AND

LEVEL

DIAGRAMS:

ia:

sece

Speda

ss

da

ae

Re

eG

24

11.

TEAC

DECIBEL

TABLES

2.

SPECIFICATIONS

AND

SERVICE

DATA

2-1

SPECIFICATIONS

Track

System

Heads

Reel

Size

Tape

Speed

3

Motors

Inputs

(Level

and

Impedance)

Outputs

(Level

and

Load

Imp.)

Playback

Equalization

Bias

Frequency

Power

Requirement

and

Consumption

Weight

Dimensions

(WHD)

4

channel

Multi-track

SIMUL-SYNC

Erase,

Record/Sync

and

Playback

10-2/1'’

and

7”

15

ips

and

7%

ips

1

DC-Servo

Capstan

Motor

2

Eddy

current

induction

Reel

motors

MIC:

Specified;

Minimum;

LINE:

Specified;

|

—12

dB

(195

mV)/50k

ohms

Minimum;

-—22

dB(61.5

mV)

LINE:

Specified;

|

—

8

dB

(308

mV)/10k

ohms

Maximum;

—

2dB(615

mV)

HEADPHONE:

—60

dB

(775

pV)/10k

ohms

—70

dB

(245

uV)

MIC

(ATT

=

0

dB)

position

—19

dB

(86.9

mV)

/4

ohms,

one

channel

ON

(MONITOR

VR

Max.)

—

6

dB

(388

mV)/4

ohms,

all

channels

ON

SIMUL-SYNC

Out:

15

ips:

3180

us

+50

us

Tips:

3180

us

+

50

us

100

kHz

+5

kHz

(push-pull

oscillator)

General

Export

UK/AUS

USA/CND

24

kg

(53

Ibs)

net

100/117

220/240

—

8

dB

(308

mV)/10k

ohms

Frequency

(Hz)

445

x

523

x

235mm

(17%"

x

204"

x

9%")

Consumption

WwW

125

543mm

(2!-3/8")

445mm(i7-

1/2")

-|

4

ws

I\

(A

oe

al

:

:

ac

1:

CICIEICIs

|e

00000000.

T-1267

Fig.

2-1

Dimensions

2-2

SERVICE

DATA

—MECHANIAL—

Tape

Speed

Deviation

and

Drift

Wow

and

Flutter

Pinch

Roller

Pressure

Reel

Torque

3000

Hz

+30

Hz,

within

15

Hz

Playback:

0.10%

(WRMS)

at

15

ips

0.12%

(WRMS)

at

7%

ips

0.15%

(RMS)

at

15

ips

0.18%

(RMS)

at

7%

ips

2.2

kg

(4.8

Ibs)

Take-up:

LARGE

770

to

830

g-cm

(11

to

12

oz-inch)

SMALL

370

to

410

g-cm

(5.2

to

5.7

oz-inch)

Back

Tension:

LARGE

330

to

390

g-cm

(4.6

to

5.5

oz-inch)

Overall:

F.F./REW

Torque

Brake

Torque

F.F./REW

Time

2-3

SERVICE

D

Frequency

Response

Signal-to

Noise

Ratio

Erase

Efficiency

Stereo

Channel

Separation

SIMUL-SYNC

Chann

SIMUL-SYNC

Crosstalk

Total

Harmonic

Distortion

1400

to

1800

g-cm

(20

to

25

oz-inch)

SMALL

180

to

220

g-cm

(2.5

to

3.1

oz-9nch)

2000

g-cm

or

more

(28

0z-inch)

140

seconds

for

1800

ft

tape

ATA

—ELECTRICAL—

Refer

to

Frequency

Response

Limits

charts

on

page

18,

20

and

22.

Overall:

45

dB

at

15

ips

46

dB

at

7%

ips

Playback:

50

dB

at

both

speeds

SIMUL-SYNC:

40

dB

at

both

speeds

65

dB

at

1

kHz

signal

(Meadurement

with

input

10

dB

higher

than

the

specified

Input

level)

el

Separation

Overall:

40

dB

channel

to

channel

at

1

kHz

signal

45

dB

channel

to

channel

at

1

kHz

signal

8

dB,

or

more.

1.0%

at

1

kHz

signal

at

0

VU

NOTE:

Asa

result

of

containing

changes

and

improvements

during

the

production

run,

minor

differences

may

be

found

between

early

and

later

machines.

Value

of

“dB”

in

this

manual

refers

to

0

dB

=

0.775

V.

3.

TOOLS

FOR

TESTING

AND

MAINTENANCE

A

minimum

of

the

following

tools

and

test

instruments

are

required

for

measuring

and

adjusting

to

obtain

optimum

performance.

Regular

maintenance

tools

will

be

adequate

is

not

available,

a

close

equivalent

can

be

used.

SPRING

SCALE:

FLUTTER

METER:

DIGITAL

COUNTER:

BANDPASS

FILTER:

VTVM

(AC):

AF

OSCILLATOR:

ATTENUATOR:

OSCILLOSCOPE:

BLANK

TAPE:

0—4

kg

(O0—8

Ibs)

0-300

g

(0-10

oz)

Meguro

Denpa

Sokki

K.K.,

Model

MK-668C

Range;

0

Hz—100

kHz

TEAC

MODEL

M-206A

(1

kHz)

Hewlett-Packard

Co.,

Model

400E

10

Hz—100

kHz

General

purpose

General

purpose

TEAC

YTT-8013

for

those

not

listed

here.

If

any

test

instrument

listed

here

TEAC

TEST

TAPE:

TEAC

EMPTY

REEL:

TOOLS:

DEMAGNETIZER:

YTT-1004

(15

ips),

YTT-1003

(7%

ips)

for

Playback

Alignment

test.

YTT-2002

(7%

ips),

YTT-2004

(15

ips)

for

Tape

Speed

and

Wow

and

Flutter

test.

RE-702

(2.5”

dia.

hub)

RE-701

(4”

dia,

hub)

2

mm

nut

driver,

Hex

Head

Allen

Wrench,

Plastic

alignment

tool,

Load

resistor

non

inductive

type

4

ohm/1

W.

TEAC

E-3

or

equivalent.

4.

PARTIAL

DIS-ASSEMBLY

4-1

OUTER

CASE

AND

PANEL

REMOVAL

Remove

panels

as

required

as

shown

in

the

illustration.

Unplug

the

power

cord

before

removing

any

panel

or

internal

part.

Fig.

4-1

Outer

Case

and

Panel

Removal

4-2

HEAD

ASSEMBLY

REMOVAL

.

Remove

the

2

screws

in

the

top

of

the

head

Cover

and

lift

it

off.

.

Remove

2

screws

holding

Head

P.C.B.

(A).

3.

Remove

2

screws

holding

Head

Base

Plate

(B)

(with

head).

4.

Remove

2

mounting

nuts

through

access

slot

in

head

base

plate

and

dis-connect

head

wire.

Refer

to

page

10

and

11.

—

nN

4-3

TENSION

ARM

REMOVAL

—

RIGHT

TENSION

ARM

—

1.

Remove

Spring

(E)

from

Switch-off

Drum

(D).

2.

Remove

set

screw

holding

Switch-off

Drum

(D),

and

remove

(C)

and

(D).

3.

Remove

NUT

holding

Right

Arm

Holder

(B),

and

lift

off

Right

Tension

Arm

(A).

—

LEFT

TENSION

ARM

—

1.

Remove

2

screws

holding

plate

(L)

and

Lift

off

Friction

spring

(J)

and

spring

(K).

2.

Remove

spring

(H)

from

Tension

Arm

Stopper

(I),

and

remove

Tension

Arm

Stopper

by

set

screw.

3.

Remove

NUT

holding

Left

Arm

Holder

(G),

and

lift

off

Left

Tension

Arm

(F).

SHIELD

PLATE

(PAPER)

Pox

a

a

;

b

2

~~

T-1269

4-4

REEL

MOTOR

REMOVAL

1.

2.

3.

6.

Remove

Power

from

Deck.

Remove

wooden

side

panels

by

removing

4

mounting

screws

each.

Loosen

2

set

screws

(Hex

head)

in

Reel

Turntable

ass’y

(D)

and

in

the

Brake

Drum

(A).

Lift

off

parts.

Disconnect

the

4

motor

wires

from

terminals

and

re-

lease

wire

harness

straps.

.

Remove

4

screws

securing

the

Brake

Ass’y

(B)

to

motor.

NOTE:

Take

care

not

to

bend

the

brake

band

or

brake

retainer

during

removal.

Remove

4

screws

securing

Reel

motor

(C)

to

chassis

through

the

front

panel.

NOTE:

When

replacing

the

LEFT

Reel

motor

Refer

Right

4-5

CAPSTAN

MOTOR,

FLYWHEEL

AND

Ne

4.

>i

illustration.

CAPSTAN

ASS’Y

REMOVAL

.

Unscrew

(by

hand)

the

capstan

dust

cap

(H).

.

Remove

2

screws

from

capstan

thrust

angle

(B)

and

re-

move

it.

.

Remove

flywheel

(C)

by

loosening

2

hex

head

set

screws

and

removing

drive

belt

(D).

Remove

Capstan

motor

(A)

with

(E)

by

removing

3

screws.

Disconnect

3

screws

to

Capstan

motor

from

P.C.B.

—

CAPSTAN

ASS‘'Y

REMOVAL

—

6.

Remove

Arm

Support

Plate

(G)

and

capstan

ass’y

(F)

by

removing

3

screws.

NOTE:

When

replacing

parts

make

sure

belt

and

capstan

shaft

are

clean

and

free

of

oil.

5.

TAPE

TRANSPORT

PARTS

LOCATION

—

REAR

VIEW

—

FREQUENCY

FUSE

P.C.B.

SELECTOR

SW

(50/60)

for

PLAY

SMALL

POWER

for

TAKE-UP

TORQUE

Drop

out

(Fixed)

TRANSFORMER

for

BACK

TENSION

for

F.F.

(or

REW)

oh

@|

BACK

TENSION

—

.

—

(Fixed)

LEFT

oy

9

REEL

MOTOR

RIGHT

REEL

:

a

Sc

‘

i

MOTOR

Se

aa]

*

fA

pNezzaer

jg

MAGNET

STOP

SENSOR

P.C.B.

ASS'Y

POWER

VOLTAGE

SELECTOR

SUPPLY

PLUG

P.C.B.

DC

SERVO

CAPSTAN

MOTOR

CAPSTAN

FLYWHEEL

LEFT

TENSION

ARM

ASS’Y

SYNC

P.C.B.

P.C.B.

‘Fig.5-1

Tape

Transport

Parts

Location

6.

HEAD

REPLACEMENT

AND

ALIGNMENT

—

MECHANICAL

—

6-1

HEAD

REPLACEMENT

To

replace

a

single

head

a

special

2

mm

nut

driver

is

re-

quired.

Remove

the

2

nuts

(A)

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

man-

ner.

Replace

the

nuts

securing

the

new

head

to

the

plate.

Perform

head

alignment

before

operation.

PLAYBACK

HEAD

only

SHIELD

Fig.6-1

Head

Replacement

6-2

HEAD

ADJ.

SCREWS

AND

ALIGNMENT

+)

o °

pe

o>”

©

\©Ye©O0®

ae

a)

©

T-1286

®

Azimuth

adj.

screws

rf)

Height

and

Tilt

adj.

screws

O)

Tangency

adj.

Nuts

Fig.

6-2

Head

Adjustment

Screws

and

Alignment

10

6-3

VISUAL

HEAD

ALIGNMENT

Since

the

head

alignment

critically

affects

the

frequency

response

on

both

playback

and

recording,

the

head

align-

ment

should

be

done

carefully.

The

head

can

be

adjusted

for

TILT,

TANGENCY,

HEIGHT

and

AZIMUTH.

For

head

alignment,

perform

the

following

coarse

adjust-

ments

first.

Then

fine

alignment

should

be

accomplished

electrically

while

playing

back

the

Test

Tape.

Coarse

Adjustment:

Without

Tape

|

2)

Neer

eran

By

Height

and

Tilt

screws

This

alignment

is

performed

by

viewing

from

the

side

without

tape

threaded.

Check

that

the

head

surface

is

parallel

to

the

tape

guide

surface.

With

Tape

TANGENCY

.....

By

Head

mounting

nuts

Loosen

the

head

mounting

nuts.

Adjust

the

head

so

that

the

vertical

alignment

of

the

head

gap

is

perpendicular

to

the

surface

of

the

tape,

then

tighten

the

head

mounting

nuts.

HEIGHT

........

By

Height

and

Tilt

screws

This

alignment

is

checked

visually

by

looking

at

the

position

of

the

head.

The

head

core

for

track-1

(inner

core)

should

be

even

with

the

inner

edge

of

the

tape.

AZIMUTH

......

By

Azimuth

adj.

Screw

Adjust

the

azimuth

adj.

screw

so

that

the

gap

of

the

head

is

perpendicular

to

the

tape

travel.

NOTE:

After

this

coarse

adjustment

is

made,

the

adj.

screws

and

the

Head

mounting

nuts

should

be

realigned

according

to

the

electrical

head

alignment

paragraph

which

follows

in

this

Service

Manual.

6-4

MIS-ALIGNMENT

OF

THE

HEADS

TILT

HEIGHT

(view

from

side

of

head)

(view

from

front

of

head)

i 4

Adjust

by

@

Screws

Adjust

by

@

Screws

AZIMUTH

{view

from

front

of

head)

Adjust

by

@

Nuts

Adjust

by

@

Screws

T-619

Fig.

6-3

Head

Mis-Alignment

—

Examples

—