Teac A-3440 User manual

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

;

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.

‘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

—

—HEAD

WIRING—

51677380

~w

TEAC

tot

TO

MOTHER

PCB

|

PNK

GRY

pA

BLU

{

|

ii»;

l

BRN

BLK BLU

BRN

ERASE

RECORD

PLAYBACK

T-1279

Fig.

6-4

Head

Wiring

7.

MEASUREMENT

AND

ADJUSTMENT

—

MECHANICAL

—

7-1

PINCH

ROLLER

PRESSURE

CHECK

NOTE:

Pinch

roller

pressure

is

supplied

by

the

pinch

roller

N=

12

spring

arms

and

it

is

most

important

that

the

sole-

noid

plungers

be

fully

bottomed

before

taking

pressure

measurements.

.

Load

tape

or

block

the

shut-off

arm

in

the

ON

position.

.

Attach

a

suitable

spring

scale

to

the

pinch

roller shaft.

.

Place

the

deck

in

the

Play

(

>

)

mode,

and

holding

the

spring

scale

as

illustrated,

slowly

draw

it

away

from

the

pinch

roller.

.

Do

not

allow

the

spring

to

rub

against

the

pinch

roller.

.

Note

the

reading

on

the

spring

scale

at

the

instant

the

pinch

roller

stops

rotating.

.

The

scale

should

indicate

2.1

to

2.3

kg

(4.6

to

6.0

Ibs).

.

If

adjustment

is

necessary,

loosen

the

3

screws

on

the

capstan

solenoid

and

position

the

solenoid

for

optimum

pressure.

.

Adjust

solenoid-limit

position

so

that

the

gap

between

capstan

shaft

and

pinch

roller

is

approx.

6

mm

when

solenoid

is

not

actuated.

Also

make

sure

pinch

roller

shaft

does

not

contact

Spring

Arm

(B).

Limit

is

adjusted

by

loosening

the

mounting

screw

(A),

then

sliding

until

proper

position

is

obtained.

Mounting

Screws(A)

Capstan

Solenoid

Reposition

Solenoid

to

Obtain

Optimum

Pressure

Capstan

Shaft

Fig.7-1

Pressure

Measurement

and

Adj.

Location

7-2

BRAKE

TORQUE

MEASUREMENT

Brake

torque

measurement

is

made

with

Power

OFF.

NOTE:

The

brake

torque

is

actuated

mechanically.

Torque

is

set

by

the

variable

leaf

spring

force.

While

making

these

measurements

and

adjustments,

be

careful

not

to

be

bent

the

brake

bands.

Preliminary

Adjustments

1.

Loosen

the

screws

marked

(A)

and

(B)

in

the

figure

and

then

push

the

solenoid

plunger

until

it is

fully

bottomed

in

the

solenoid.

At

this

time

adjust

the

brake

solenoid

for

minimum

clearance

between

Brake

Arm

and

Solenoid

Plunger.

Then

tighten

four

screws

(B).

Then,

while

the

plunger

is

fully

bottomed,

adjust

the

position

of

the

Brake

Band

Space

Ass’y

so

that

there

is

a

clearance

be-

tween

the

Brake

Band

and

the

surface

of

the

Brake

Drum.

Then

tighten

two

screws

(A).

Fine

Adjustment

2.

Piace

an

empty

large

hub

reel

on

the

left

reel

table,

and

fasten

one

end

of

a

30”

length

of

string

to

the

reel

an-

chor.

.

Wind

serveral

turns

of

string

counter

clockwise

around

the

hub

and

attach

a

suitable

spring

scale

to

the

free

end

of

the

string.

.

Pull

on

the

spring

scale

and

take

a

reading

only

when

the

reel

is

in

steady

motion

since

the

force

required

to

over-

come

static

friction

will

produce

a

false,

excessively

high

initial

reading.

.

The

reading

should

be

1600

to

2000

g-cm

(22.4

to

28.0

oz-inch).

.

If

adjustment

is

required,

loosen

the

3

screws

marked

(C)

shown

and

position

the

brake

for

optimum

pressure.

.

The

adjustment

of

the

right

brake

is

the

same

with

the

exception

that

rotations

are

clockwise.

(Wind

string

Clockwise

around

reel

hub).

Brake

Band

Space

Adj.(A)

Brake

Torque

Adj.

Screws

(C)

'

Brake

Solenoid

Stroke

Adj.

(B)

Fig.

7-2

Brake

Torque

Measurement

and

Adj.

Locations

TORQUE

MEASUREMENT

PROCEDURE

NOTE:

The

following

torque

measurements

should

be

made

with

a

spring

scale

that

is

calibrated

to

read

Torque

in

gram-cm.

for

a

7’’

reel

with

a

small

reel

hub.

If

the

spring

scale

you

are

using

is

calibrated

to

read

Force

or

Weight

in

grams

the

Torque

must

be

calculated

using

the

Formula:

Torque

(in

gm-cm

or

0z:in)

=

Weight

or

Force

(in

gr.

or

oz.)

x

radius

of

hub

(in

cm

or

inches)

If

you

are

using

a

reel

with

other

than

the

standard

2.5”

or

6.0

cm

(approx.)

diameter

hub,

the

Torque

must

be

calcu-

lated

using

the

same

formula

and

substituting

the

actual

radius

and

Weight

or

Force

reading.

All

Torque

and

Tension

measurements

must

be

made

with

the

automatic

shut-off

switch

(right

tension

arm)

held

in

the

ON

position.

Brake

Torque

Measurements

should

be

made

using

large

hub

reel

with

a

hub

diameter

of

4.

or

10.2

cm.

BACK

TENSION

(FWO)

so

rakeuP

Torque

(Fwo?

i

1.628

Fig.

7-3

Torque

Measurement

7-3.

TAKE-UP

TORQUE

1.

Place

an

empty

reel

on

the

right

reel

table

and

attach

spring

scale.

2,

Place

the

deck

in

the

Play

mode.

3.

Allow

the

rotation

of

the

reel

to

draw

the

scale

slowly

towards

the

hub.

4.

Hold

the

spring

scale

with

enough

force

to

allow

asteady

reading.

5.

The

reading

or

calculated

value

should

be

approx.:

[

REEL

SW|

TAKE-UP

TORQUE

770

to

830

g-cm

(11

to

12

oz-inch)

370

to

410

g-cm

(5.2

to

5.7

oz-inch)

NOTE:

LARGE

size

value

is

for

reference

only.

7-4

BACK

TENSION

1.

Place

an

empty

7”

reel

with

small

hub

on

the

left

reel

table

and

fasten

one

end

of

a

30”

length

of

string

to

the

reel

anchor.

2.

Wind

several

turns

of

string

counter-clockwise

around

the

hub.

Attach

spring

scale

to

string.

3.

Place

the

deck

in

the

Play

mode.

4.

Pull

the

scale

away

from

the

reel

against

the

motor

tor-

que

with

a

steady,

smooth

motion.

5.

Note

the

scale

reading

while

it is

in

steady

motion.

(The

string

must

not

rub

the

reel

flanges)

6.

The

reading

or

calculated

value

should

be

approx.:

BACK

TENSION

330

to

390

g-cm

(4.6

to

5.5

oz-inch)

180

to

220

g-cm

(2.5

to

3.1

oz-inch)

NOTE:

LARGE

size

value

is

for

reference

only.

Adjustment

Location

If

necessary,

adjust

slider

of

the

resistors

until

you

have

the

correct

scale

reading

for

optimum

torque.

Refer

to

adj.

loca-

tion

below.

for

TAKE-UP

TORQUE

for

BACK

TENSION

for

F.F

(or

REW)

BACK

TENSION

NOTE:

No.3

for

no

adjustment

provided

(FIXED),

Fig.

7-4

Resistors

Adj.

Location

7-5

FAST

FORWARD

AND

REWIND

TORQUE

SPECIFICATION

2000

g-cm

(28

oz-inch),

or

more

at

F.F.

2000

g-cm

(28

oz-inch),

or

more

at

REW

13

7-6

MAGNETIC

RESISTANCE

ELEMENT

(STOP

SENSER

ASS’Y)

POSITION

ADJ.

1,

Adjust

Screws

for

a

gap

between

Magnet

and

Magnetic

Resistance

Element

of

approx.

1

mm.

2.

Check

that

there

is

no

delay

when

changing

from

F.F.

(or

REW)

mode

to

Play

mode.

Location;

on

right

side

when

viewed

from

the

rear.

MAGNETIC

Pos

BRAKE

DRUM

RESISTANCE

ELEMENT

MAGNET

STOP

SENSOR

/

PCB

ASS’Y

Approx.

|

mm

Fig.

7-5

Magnetic

Resistance

Element

Position

Adj.

Locations

7-7

LEFT

TENSION

ARM

ADJ.

1.

Place

the

deck

in

the

Play

mode.

2.

Adjust

the

“ground

terminal”

(B)

screw

for

uniform

movement

of

the

Tension

Arm.

3.

Adjust

the

‘‘ground

terminal”

(A)

so

that

when

the

ten-

sion

arm

is

in

the

rest

position,

there

is

no

gap

between

the

“stopper”

the

side

of

the

circular

cut-out

in

which

it

sits.

In

other

words,

the

lug

should

be

adjusted

so

that

the

spring

supplies

just

sufficient

tension

to

hold

the

“‘stopper”

against

the

side

of

the

hole

in

the

top

panel.

The

“stopper”

is

the

right-angled

flange

with

a

rubber

Sleeve

labeled

I

in

the

illustration

for

section

4-3

(page

7).

14

78

TAPE

SPEED

MEASUREMENT

The

tape

speed

should

be

measured

using

TEAC

flutter

free

tape,

Type

YTT-2003

(7%

ips)

and

YTT-2004

(15

ips).

These

contain

a

highly

accurate

3000

Hz

tone.

Connect

a

digital

frequency

counter

to

either

line

OUTPUT

jack.

The

indicated

frequency

should

be

as

follow.

3000

Hz

+30

Hz

Within

15

Hz,

or

less

Tape

Speed

Deviation

Using

PITCH

CONT

2820

Hz

to

2550

Hz

Max.

(+)

|

3180

Hz

to

3450

a

NOTE:

Tape

Speed

Measurement:

PITCH

CONT

should

be

in

OFF

position.

If

necessary,

adjust

tape

speed

on

the

Capstan

Servo

P.C.B.

See

Fig.

7-7

below.

for

HIGH

speed

for

LOW

speed

Fig.

7-7

Tape

Speeds

Adj.

Location

Ground

Terminal

(A)

Adjust

for

no

gap

Ground

Terminal

(B)

Stopper

+S

=

SS

=

T-1282

Fig.

7-6

Left

Tension

Arm

Adj.

7-9

WOW

AND

FLUTTER

CHECK

NOTE:

Before

performing

this

measurement,

clean

the

head

and

tape

run

guides.

Also

check

pinch

roller

pressure,

etc.

Use

new

test

tape

if

possible

for

the

following

adjustments.

Values

obtained

with

different

standards

or

equip-

ment

cannot

be

compared.

PLAYBACK

PERFORMANCE

.

Connect

Test

equipment

to

the

deck

as

shown

in

Fig.

7-8.

(Except

Oscillator).

.

Load

TEAC

YTT-2003

(for

LOW,

7%

ips)

or

YTT-2004

(for

HIGH,

15

ips)

tape,

and

playback.

.

Read

the

indication

on

the

Wow

and

Flutter

meter.

4.

The

Wow

and

Flutter

should

be:

0.10%

or

less

(WRMS)

for

15

ips

0.12%

or

lesss

(WRMS)

for

7%

ips

—

nN

bo

OVERALL

PERFORMANCE

1.

Connect

test

equipment

to

the

deck

as

shown

in

Fig.

7-8.

2.

Load

TEAC

YTT-8013

blank

tape

on

the

deck

and

Re-

cord

a

3000

Hz

input

signal.

3.

Rewind

and

playback

the

recorded

signal.

4.

The

reading

on

the

Meter

should

be:

0.15%

(RMS)

for

15

ips

0.18%

(RMS)

for

7%

ips

NOTE:

These

figures

apply

to

any

tape

position

(such

as

full

take-up,

full

supply

reel

or

about

midpoint).

FREQUENCY

COUNTER

OSCILLATOR

WOW

&

FLUTTER

METER

DECK

under

TEST

LINE

IN

Fig

7-8

Test

Connections

for

Wow/Flutter

and

Tape

Speed

Test

7-10

VOLTAGE

AND

FREQUENCY

CONVERSION

(GENERAL

EXPORT

MODEL

ONLY)

This

deck

is

adjusted

to

operate

on

an

electric

power

source

of

the

voltage

and

frequency

specified

on

the

reel

tag

and

packing

carton.

If

it

is

necessary

to

change

the

frequency

or

voltage

requirements

of

this

deck

to

match

your

area,

use

the

following

procedures.

ALWAYS

DISCONNECT

POWER

LINE

CORD

BEFORE

MAKING

THESE

CHANGES.

Frequency

Conversion:

1.

Remove

the

rear

panel

of

the

deck

by

removing

5

screws

and

2

feet

on

the

top.

2.

Set

the

power

frequency

selector

slide

switch

to

the

50

or

60

position

to

match

the

power

line

frequency

in

your

area.

(See

Location

below.)

NOTE:

This

deck

uses

a

DC

Servo

controlled

capstan

mo-

tor

so

it is

not

necessary

to

change

the

capstan

drive

belt.

Voltage

Conversion:

The

deck

may

be

set

for

100,

117,

220

or

240

volts.

To

alter

the

setting,

pull

out

the

voltage

selector

plug

and

rein-

sert

it

so

that

the

desired

voltage

shows

in

the

cutout.

(See

location

below.)

POWER

FREQUENCY

SELECTOR

SLIDE

SW

VOLTAGE

SELECTOR

PLUG

Fig.

7-9

Voltage

and

Frequency

Conversion

Locations

8.

MEASUREMENT

AND

ADJUSTMENT

—

ELECTRICAL

—

|

e

Before

performing

maintenance

on

this

deck,

thoroughly

clean

and

demagnetize

the

entire

tape

path.

TEAC

maintenance

equipment

to

be

used:

TEAC

TZ-261

A/B

for

cleaning

TEAC

E-3

or

equivalent

for

demagnetizing

¢

Service

Data

were

determined

using

TEAC

YTT-Series

Test

Tape.

e

The

deck

must

be

matched

to

the

voltage

and

frequency

of

your

locality.

Refer

to

Power

Requirement

and

Consumption

chart

(Item

2-1,

Specifications

Section).

eMost

amplifier

checks

and

adjustments

can

be

made

from

the

bottom

with

the

(bottom)

metal

panel

removed.

©

Outlined

procedures

refer

only

to

channel

1,

the

same

procedures

also

apply

to

channel

2,

3

and

oe

ADJUSTMENT

LOCATIONS

AND

ADJUSTMENT

POINTS

PLAY

BIAS

OUT

PUT

METER

SOURCE

REC

BIAS

RE

AL

CAL

REC/PLAY

PCB

CAL

LEVEL

5

CH!

CAL

TRAP

C,

(8)

ie

(7):

DUMMY

COIL.

T-1278

Fig.

8-1

Adjustment

Locations

and

Adjustment

Points

16

8-MONITOR

PERFORMANCE

ADJ.-1

8-1

LINE

INPUT

LEVEL

ADJUST

—

N

wW

wk

OUTPUT

SELECT

SW........

SOURCE

INPUTSW

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

LINE

INPUT

VR

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

Maximum

.

Remove

the

special

shorting

connector

joining

ENCODER

SEND

and

ENCODER

RCV

jack

1

(Channel

1).

Connect

a

VTVM

to

the

ENCODER

SEND

jack

1.

seh?

T1280

Fig.

8-2

Shorting

Connector

Apply

a

400

Hz

—22

dB

(61.5

mV)

signal

from

an

AF

oscillator

to

LINE

IN

jack

1.

.

Adjust

the

SOURCE

CAL.

VR194

for

—8

dB

(308

mV)

at

ENCODER

SEND

jack

1.

NOTE:

This

is

the

Minimum

Input

Level

Change

the

input

signal

to

—12

dB

(195

mV).

.

Adjust

INPUT

level

control

for

—8

dB

(308

mV)

at

the

ENCODER

SEND

jack

1.

NOTE:

This

setting

represents

the

Specified

Input

Level

OSCILLOSCOPE

AMP

SPKR

=

AC

Voltmeter

OSCILLATOR

ENCODER

SEND

ie}

T~1367

Fig.

8-3

Test

Connections

for

Monitor

Check

8-2.

MIC

CIRCUIT

FUNCTION

CHECK

6

7

8

INPUT

SW

....

MIC

(ATT

=0

dB)

.

Apply

a

400

Hz

signal

at

—60

dB

+2

dB

(975

uV

615

uV)

to

the

MIC

input

jack

(on

front

panel).

.

Check

for

—8

dB

(308

mV)

at

ENCODER

SEND

jack

1.

INPUT

SW

....MIC

(ATT

=

20

dB)

.

Check

for

an

output

20

dB

+1

dB

below

the

308

mV

output

obtained

in

steps

6

and

7

above.

(ie.

Output

should

now

be

—

28

dB

or

30.8

mV)

=)

8-3.

OUTPUT

AMP.

GAIN

ADJ.

9.

10.

11.

12.

13.

14.

Be

sure

the

control

are

set

as

in

8-1

(Specified

Input

Level

Setting).

Insert

shorting

connector

between

ENCODER

SEND

and

RCV

jacks.

Connect

a

VTVM

to

the

OUTPUT

jack

1.

Set

the

OUTPUT

Level

‘Control

to

position

“8”.

This

is

the

Specified

Output

Setting.

Apply

a

400

Hz

—12

dB

(195

mV)

signal

from

the

oscil-

lator

to

LINE

IN

jack

1.

Adjust

OUTPUT

CAL

R149

for

—8

dB

(308

mV)

at

OUTPUT

jack

1.

84

VU

METER

CALIBRATION

15.

Adjust

METER

CAL

R159

for

0

VU

reading

on

the

VU

METER.

NOTE:

Repeat

the

above

procedures

for

channels

2,

3

and

4,

9-PLAYBACK

PERFORMANCE

ADJ.

9-1

PLAYBACK

HEAD

AZIMUTH

ADJ.

NOTE:

Before

proceeding

with

the

following

head

adjust-

ments

be

sure

that

the

heads

have

been

properly

mounted

for

HEIGHT,

TILT

and

TANGENCY.

See

page

10.

OSCILLOSCOPE

DECK

under

TEST

T~813

Fig.

8-4

Head

Alignment

Fine

Adjustment

Set-up

and

Test

Connections

(PLAYBACK)

OUTPUT

SELECT

SW..........

PLAY

.

Connect

a

VTVM

to

the

OUTPUT

jack

1.

.

Remove

the

head

housing

by

removing

the

2

retaining

SCTews.

.

Thread

a

TEAC

YTT-1003

Test

Tape

on

the

deck.

.

Play

(bm)

the

16

kHz

—10

dB

test

tone

from

section

2

of

the

test

tape.

.

Slowly

rotate

the

Azimuth

screw

until

the

maximum

signal

is

read

on

the

VTVM.

6.

Connect

an

oscilloscope

to

the

OUTPUT

jack

1

and

3.

7.

Adjust

the

Azimuth

screw

if

necessary

until

the

following

phase

difference

figures

are

obtained.

See

17

:

3

{

Tape

Speed

|

Frequency

Limits

|

Phase

Difference

7-1/2

ips.

|

400

Hz

—

6

kHz

NOTE:

Phase

difference

readings

are

made

between

ch

1

and

ch

3

and

between

ch

2

and

ch

4.

8.

After

adjustment,

secure

the

screw

with

a

drop

of

lock-

ing

paint.

9-2

OUTPUT

LEVEL

SETTING

9.

The

Specified

Output

Level

Setting

must

be

used.

See

Item

8-3

step

12

above.

10.

Connect

a

VTVM

to

the

DECODER

SEND

jack

1.

11.

Play

the

400

Hz

0

dB

tone

in

section

1

of

the

YTT-1003

Test

Tape.

12.

Adjust

PLAY

CAL

R143

for

—8

dB

(308

mV)

at

DE-

CODER

SEND

jack

1.

13.

Insert:

shorting

connector

between

DECODER

SEND

and

RCV

jacks.

14.

Check

for

—8

dB

(308

mV)

at

OUTPUT

jack.

(QUTPUT

Level

control

at

position

“8”’).

MAX.

OUTPUT

LEVEL

15.

Turn

the

OUTPUT

Level

control

fully

clockwise

(max.)

and

check

for

—2

dB

+2

dB

at

OUTPUT

jack

1.

16.

Reduce

OUTPUT

Level

Control

until

—8

dB

(308

mV)

is

obtained

on

the

VTVM.

NOTE:

This

is

the

Specified

Output

Level

Setting.

Do

not

disturb

this

setting

until

the

remaining

adjustments

have

been

completed.

Fig.

8-5

Specified

Output

Levet

Setting

9-3.

VU

METER

INDICATION

CHECK

17.

With

the

controls

set

as

described

above

check

that

the

VU

METER

reads

0

VU

+0.5

VU.

18

9-4

FREQUENCY

RESPONSE

—

PLAYBACK

18.

Play

the

Test

Tape

and

compare

the

readings

on

the

VTVM

with

the

response

limits

given

in

Fig.

8-6.

Tape

Speed

Play

EQ

Adj.

HIGH

LOW

Test

Tape

YTT-1004

YTT-1003

R117

R122

:

il

Moo

tT

AL

RESPONSE

IN

8

4

22K

5OK

FREQUENCY

IN

Hz

THi27e

Fig.

8-6

Frequency

Response

—Playback—

NOTE:

If

the

measured

frequency

response

does

not

meet

the

specified

response

limits,

especially

at

the

high

end

of

the

spectrum,

check

that

the

heads

are

free

of

accumulated

dirt

or

oxide.

If

they

are

comple-

tely

clean

the

head

azimuth

must

be

readjusted.

9-55

SIGNAL-TO-NOISE

RATIO

—

PLAYBACK

—

19.

OUTPUT

Level

Control

should

be

at

the

Specified

Out-

put

Level

Setting.

20.

Remove

the

Test

Tape

from

the

deck.

Hold

the

shut-off

arm

(right)

in

the

ON

position.

21.

Press

the

PLAY

(>>)

button.

22.

The

VTVM

connected

to

the

OUTPUT

jack

should

in-

dicate

the

values

below.

OUTPUT

SELECT

SW

|

Tape

Speed

S/N

7-1/2

i

ips

—58

dB

NOTE:

This

corresponds

to

a

signal-to-noise

ratio

of

50

dB

(for

PLAY

7%

ips).

It

is

the

difference

between

the

residual

noise

of

—58

dB

and

the

specified

output

level

of

—8

dB.

10-MONITOR

PERFORMANCE

CHECK

-2

10-1

MONITOR

LEVEL

CHECK

OUTPUT

SELECT

SW......

SOURCE

INPUT

SW

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

LINE

IN

1.

Apply

a

400

Hz

—12

dB

(195

mV)

signal

from

the

oscil-

lator

to

the

LINE

IN

jack

1.

2.

Check

for

—8

dB

(308

mV)

at

the

OUTPUT

jack.

Also

check

for

0

VU

on

the

VU

METER.

10-2

HEADPHONE

OUTPUT

LEVEL

CHECK

MONITOR

CONTROL

VOLUME

...

Maximum

NOTE:

At

this

point

both

the

INPUT

control

and

the

OUTPUT

control

are

at

their

Specified

Settings.

3.

Connect

a

4

ohm

non-inductive

resistor

across

the

head-

phone

(PHONES)

jack

and

connect

the

VTVM

across

the

resistor.

4.

Depress

the

Headphone

Selector

Button

for

channel

1.

5.

The

VTVM

should

indicate

—19

dB

+1

dB

(77.5

mV

—

97.5

mV).

6.

Depress

the

buttons

for

channels

2,

3

and

4

so

that

all

4

are

depressed.

7.

The

VTVM

reading

should

increase

to

—6

dB

+2

dB

(308

mV

—

489

mV).

7

)

—_

D>

T-1366

Fig.

8-7

Test

Connections

for

Headphone

Output

Check

11-RECORD

PERFORMANCE

ADJ.

NOTE:

For

all

record

performance

measurements

and

adjustments

the

FUNCTION

SELECT

SW

should

be

ON

for

all

channels.

11-1

BIAS

TRAP

ADJUSTMENT

1.

Remove

all

Input

Signals.

<.

Thread

a

blank

tape

on

the

deck

and

depress

RECORD

and

PAUSE

buttons.

3.

Connect

a

VTVM

or

oscilloscope

to

Test

Point

(T.P.)

and

ground.

See

Fig.

8-8.

4.

Using

a

plastic

trimmer

tool,

adjust

the

BIAS

TRAP

L103

for

minimum

reading

on

the

scope

or

meter.

BIAS

REC

TRAP

EQ

REC/PLAY

PCB

AC

Voltmeter

Fig.

8-8

Bias

Limits

Chart

11-2

RECORD

BIAS

ADJ.

Tape

SPEED

Selector

SW.

.

LOW

(7-1/2

ips)

OUTPUT

SELECTSW.........

:

PLAY

NOTE:

Be

sure

the

Bias

Trap

has

been

adjusted

as

per

section

11-1.

5.

Apply

a

7

kHz

signal

at

-22

dB

(61.5

mV)

to

the

LINE

IN

jack.

6.

Turn

the

trimmer

capacitor

C381

fully

counter-clockwise.

7.

While

recording

on

the

YTT-8013

blank

tape,

slowly

turn

the

Trimmer

Capacitor

clockwise

until

the

reading

peaks

and

continue

turning

clockwise

until

the

reading

backs

off

2

dB.

8.

These

procedures

are

repeated

for

channels

2,

3

and

4,

NOTE:

The

Trimmer

Capacitors

are

located

on

the

BIAS

P.C.B.

Refer

to

page

16

Adj.

Location

and

Adj.

points.

—~>

OUT

——>

BIAS

T-

712

Fig.

8-9

Bias

Limits

Chart

19

oS

a

PN

ROT

ON

RES

Ce

EAL

A

Oe

OEE

eer

TR

RTE

SET

ERED

CORR

Sen

ES

RE

ee

Sa

ae

Ve

CRC

11

9.

10.

il.

12.

11

OSCILLOSCOPE

AC

Voltmeter

under

TEST

1-621

Fig.

8-10

Test

Connection

for

Recording

Check

3.

RECORD

LEVEL

SET

Apply

a

400

Hz

signal

at

—12

dB

(195

mV)

to

the

LINE

IN

jack.

Check

that

the

LINE

and

OUTPUT

Controls

are

still

at

their

specified

positions.

Begin

recording.

Adjust

REC

LEVEL

R206

for

—8

dB

(308

mV)

at

the

OUTPUT

jack.

4

FREQUENCY

RESPONSE

—

OVERALL

NOTE:

To

avoid

saturation

of

the

tape

these

checks should

+

os

5

RESPONSE

IN

dB

*

I

ES

20

be

made

at

least

10

dB

(—10

VU)

below

the

speci-

fied

input

level

(ie.

—22

dB/61.5

mV)

for

LOW

Speed

and

at

0

VU

for

HIGH

Speed.

Any

bias

signal

feeding

into

the

test

equipment

should

be

filtered

out

by

adjusting

the

external

bias

trap.

Tape

SPEED

Selector

SW

.........

LOW

.

Apply

a

signal

swept

from

40

Hz

to

20

kHz

at

—22

dB

(61.5

mV)

to

the

LINE

IN

jack

and

record

on

a

blank

TEAC

YTT-8013

tape.

.

During

recording

monitor

the

off-tape

signal

and

adjust

Equalization

REC

EQ

L102

for

readings

within

the

res-

ponse

limits.

FREQUENCY

IN

Hz

Fig.

8-11

Frequency

Response

—Overall—

1

Tape

SPEED

Selector

SW........

HIGH

3.

Apply

a

signal

swept

from

40

Hz

to

22

kHz,

this

time

at

a

level

of

—12

dB(195

mV)

and

check

that

the

response

is

within

the

limits

indicated.

4.

If

REC

EQ

L102

are

adjusted

check

LOW

section

again.

NOTE:

If

the

response

is

not

uniform,

the

heads

should

be

checked

for

accumulated

dirt

and

oxide

and

the

bias

adjustment

should

be

repeated.

RESPONSE

IN

dB

FREQUENCY

iN

Hz

121275

Fig.

8-12

Frequency

Response

—Overall—

2

11-5

SIGNAL-TO-NOISE

RATIO

—

OVERALL

5.

OUTPUT

and

LINE

Controls

should

be

at

the

specified

positions.

6.

Remove

the

AF

oscillator

from

the

LINE

IN

jack.

.

Place

the

deck

in

the

Record

mode

with

no

signal

applied.

.

Note

the

point

on

the

Index

Counter

where

the

record-

ing

begins.

9.

Rewind

the

recorded

tape

to

the

beginning

and

play

it

back.

10.

The

noise

levels

read

on

the

VTVM

should

be

as

follows:

co~

Noise

Level

—54

dB

(1.55

mV)

or

better

—53

dB

(1.73

mV)

or

better

NOTE:

This

—53

dB/54

dB

corresponds

to

a

S/N

ratio

of

45

dB/46

dB

(minimum),

being

the

difference

between

the

residual

noise

and

the

specified

out-

put

level

of

—8

dB.

Tape

Speed

LOW

(7-1/2

ips)

HIGH

(15

ips)

The

measuring

method

used

to

establish

the

S/N

spec.

in

the

catalogue

and

the

owner’s

manual

is

different

and

these

figures

will

not

be

the

same.

Teac A-3440 User manual

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