Teac A-7300 Manuel utilisateur

Ce manuel convient aux modèles suivants

1

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SERVIGEMANUAL

GENERAL

DESCRIPTION

TEAC'S

A-7300

and

A-7300

2T

are

high

quality

stereo

tape

decks,

representing

a

New

Generation

in

the

design

and

construction

of

recording

equipment.

With

AC

reel

motors

and

Direct-Drive

Servo-cont-

rolled

DC

Motor-Capstan,

all

controlled

by

Integrated

Cir-

cuit

(IC)

Logic

Circuitry,

these

decks

provide

highly

reliable

operation

at

greatly

reduced

noise

and

heat

levels.

With

almost

all

relays

replaced

by

Logic

Circuits,

transport

control

is

quick

and

positive

and

governed

by

6

calculator-

like

buttons

on

the

control

center.

Advanced

electronics

are

also

utilized.

This

manual

is:

the

final

version

and

supersedes

previous

provisional

manual.

PRODUCT

OF

JAPAN

SPECIFICATIONS

MECHANICAL

—

Tracks:

A-7300

4

track

2

channel

stereophonic

track

2

channel

monophonic

track

1

channel

monophonic

LS

A~7300

2T

2

track

2

channel

stereophonic

2

track

2

channel

monophonic

e

2

track

1

channel

monophonic

Heads:

Erase

X1,

Rec

X1,

Playback

X1

Reel

Size:

10-1/2"

maximum

NAB

reel

Tape

Speeds:

A-7300.....

7-1/2

ips

&

3-3/4

ips

A-7300

2T..15

ips

&

7-1/2

ips

Motors:

Direct

drive

DC

servo

capstan

motors

Xl

6-pole

eddy-current

induction

motors

for

reel

drive

X2

Wow

&

Flutter:

0.05

%

at

15

ips

(W-RMS)

0.06

%

at

7-1/2

ips

(W-RMS)

0.10

%

at

3-3/4

ips

(W-RMS)

Wow

and

flutter

measured

according

to

weighted

(W-RMS)

NAB

standard

using

TEAC

YTT-2004/2003/2002

flutter-free

tape.

Above

value

is

measured

during

playback.

Fast

Winding

Time:

Approx.

150

seconds

or

less

with

1800

ft

tape

Power

Requirement:

117

V

60

Hz

80

W

Weight:

62

lbs

(28

Kg)

net

Dimensions:

21-5/8"

(H)

17-3/8"

(W)

9-3/4"

(D)

548

(H)x440

(W)X246

(D)

mm

ELECTRICAL

——_-_-Y-TS

TST,

.————MTTTTT

O

dB=

0.

.

aa

Frequency

Response:

(Measured

at

20

dB

below

the

Spesified

level)

Refer

to

page

11,12,13

Freq.

Response

Limits

chart

Input

Impedance:

-

LINE:

50

KQor

more

MIC:

6002

(balanced)

Output

Load

Imp:

LINE

OUT:

10

KQor

more

HEADPHONE:

82

Equalization:

A-7300

7-1/2

ips...50uS

&

3180uS

(Playback)

3-3/4

ips...90u4S

&

3180uS

A-7300

2T

15

ips......50uS

&

3180

uS

7-1/2

ips...50uS

&

318048

Output

Level:

OUTPUT:

O

dB

+6

dB

+1

dB

(max.)

HEADPHONE:

-17

dB

-11

dB

+2

dB

(max.)

Input

Level:

LINE:

-8

dB

-18

dB+2

dB(min.)

MIC:

-48

dB

-58

dB+2

dB(min.)

with

ATT

(dB)

0O

(back

panel)

-38

dB

+3

dB

(min.)

with

ATT

(dB)

20

(Back

panel)

Bias

Frequency:

100

KHz

(+5

KHz:

Push-pull

Oscillator)

Crosstalk

Rejection:

40

dB

or

more,

adjacent

track

at

1

KHz

Channel

Separation:

45

dB

(4T,

2T)

or

more,

channel

to

channel

at

1

KHz

Erasure:

68

dB

(4T),

65

dB

(2T)

or

more

f

Signal-To-Noise

}

Ratio:

Better

than

53

dB

at

15

ips

(playback)

Better

than

52

dB

at

7-1/2

ips

Better

than

48 dB

at

3-3

4

ips

TAPE

TRANSPORT

PARTS

LOCATION

Adjuster

for

Back

Tension

(F.F,

REW)

Adjuster

(R-154)

for

Take

up

Adjuster

(R-155)

for

Back

Tension

C155

Reel

Motor

(L)

Reel

Motor

(R)

Reel

Motor

Drive

Unit

Power

PC

Board

Ass'y

Stabilizer

Unit

Capstan

Motor

Tape

Counter

Ass'y

-REAR

VIEW-

Fig.

1-1

Tape

Transport

Parts

Location

Terminal

A

Fig.

1-2

Control

PC

Board

2

ADJUSTMENT

OF

D.C.

Con

the

STABILIZER

UNIT)

NOTE

:

MEASUREMENT

AND

ADJUSTMENT

-"MECHANICAL-

The

TEAC

A~7300

uses

highly

reliable

AC

Motors

for

both

reel

motors,

and

a

DC

direct-drive

capstan

system.

It

should

re-

quire

a

minimum

of

mechanical

maintenance

or

adjustment.

These

adjustments

are

made

at

the

factory.

Readjustments

should

only

be

required

after

long

periods

of

operation

or

following

component

replacement.

To

prevent

damage

to

the

motor

and

control

circuitry:

1.

Remove

terminal

A

from

the

Control

PC

board.

See

Fig.

1-2.

2.

Disconnect

the

11

pin

connector

from

the

motor

(Connector

Block).

Adjustment

Procedure

1.

Remove

the

rear

panel.

2.

Remove

terminal

A,

and

11

pin

connector.

3.

Place

the

POWER

switch

to

"ON".

4.

Connect

a

VOM

or

VTIVM

across

the

24V

Test

Point

(Red

Lead

Socket)

and

chassis

Ground.

Adjust

VR21

if

needed

to

obtain

24V

+

0.5V

DC.

wn

6.

Adjust

VR-22

for

5V

+0.25V

DC

output

at

5V

test

point

(Pink

Lead

socket).

VR21

VR22

Decrease

Increase

Increase

Decrease

Fig.

2

Adjustment

Locations

Capstan

motor

Pink

Lead

Socket

for

5

V

11P

Connecter

Connecter

Block

Red.

Lead

Socket

for

24

V

Fig.

3

Test

Points

3

CAPSTAN

SHAFT

TOLERANCE

ADJUSTMENT

1.

Check

that

the

capstan

motor

moves

©

i

: 2

Capstan

Shaft

freely

without

binding

on

the

Thrust-

‘

plate.

li

ae

2.

Check

that

the

clearance

between

the

motor

shaft

tip

and

the

Thrustplate

—-

Lock

Nut

is

between

0.1 and

0.3

millimeter.

0.10.3

mm

KA

3.

To

adjust,

first

loosen

the

locking

tolerance

@)

nut;

then

set

with

a

common screw-

Ps

x

'

Adjustment

driver

for

approx.

0.2mm

clearance.

Seraw

Check

by

observing

the

capstan

move-

for

Capstan

Shaft

ment.

4,

Tighten

the

Lock

Nut

and

secure

with

locking

paint.

Fig.

4

Shaft

Tolerance

Adj.

Location

TAPE

SPEED

ADJUSTMENT

Place

the

PITCH

CONT

to

the

OFF

position.

The

tape

speed

should

be

measured

using

TEAC

flutter

free

tape,

Model

YTT-2004

(15

ips),

YTT-2003

(7-1/2ips),

YTT-2002

(3-3/4

ips).

These

tapes

contain

a

highly

accurate

3000

Hz

tone.

Connect

a

digital

frequency

counter

to

either

line

OUTPUT

jack.

The

indicated

frequency

should

be

LOW

Speed

0

(®

3000

Hz

(+10

Hz

or

less)

for

Fig.

5

Tape

Speed

Adjusters

both

speeds.

If

necessary,

adjust

"adjustable

resistors"

on

the

CAPSTAN

MOTOR.

FLUTTER

Flutter

should

be

measured

in

Playback

mode

using

a

TEAC

flutter-

free

tape

YTT-2004

(

l5ips),

YTT-2003

(7-1/2ips),

2002

(3-3/4ips)

and

Meguro

model

ymx665B

flutter

meter.

Measurement

of

flutter

should

be

made

accordance

with

NAB

standards.

Values

obtained

with

different

standards

of

euipment

cannot

be

compared.

Flutter

should

not

exceed.

I5ips

:

0.10%

(RMS)

0.05%

(W-RMS)

7-1/2ips:

0.12%

(RMS)

0.06%

(W-RMS)

3-3/4ips:

0.15%

(RMS)

0.10%

(W-RMS)

These

figures

apply

to

any

tape

position

and

direction

(such

as

full

take-up

reel,

full

supply

reel

or

about

mid-point).

If

there

is

excessive

wow

and

flutter,

examine

the

pinch

roller,

motors,

capstan

shaft,

and

reel

rest

for

"grease",

"oil",

"dirt"

and/or

"wear".

Also

examine

the

tape

counter

assy

for

even-

ness

of

operation.

Use

to

TEST

UNIT

Tape

Speed

FLUTTER

FREE TAPE

Test

Equipment

Set-up

PINCH

ROLLER

PRESSURE

NOTE:

Pinch

roller

pressure

is

supplied

by

the

pinch

roller

solenoid

arm

and

it

is

most

important

that

the

solenoid

plungers

be

fully

bottomed

before

taking

pressure

measurement.

1.

Load

tape

or

block

the

shut-off

arm

in

the

"ON"

position.

Remove

the

Pinch

Roller

Cap.

2.

Attach

a

suitable

spring

scale

to

a

screw

inserted

in

the

pinch

roller

shaft.

3.

Place

the

unit

in

the

PLAY

mode

(

P»

),

and

holding

the

spring

scale

as

illustrated,

slowly

draw

it

away

from

the

pinch

roller.

(Do

not

allow

the

string

to

rub

against

the

pinch

roller.)

4.

Note

the

reading

on

the

spring

scale

at

the

instant

the

pinch

roller

stops

rotating.

foes)

lf

adjustment

is

necessary,

loosen

the

3

mounting

screws

on

the

capstan

solenoids

and

position

the

solenoids

for

optimum

pressure.

screw

M3

x12

Solenoid

Bracket

Decrease

Increase

Adjustment

3

Screws

Fig.

7

Adjustment

Location

The

scale

should

indicate

2

kg

+200

g

for

2T

(1.8

kg

+

200

g

for

4T).

TORQUE

MEASUREMENT

PROCEDURE

All

Torque

and

Tension

Measurement

must

be

made

with

the

automatic

shut-off

switch

(right

tension

arm)

blocked

to

the

"ON"

position.

BACK

TENSION:

Place

the

REEL

size

switch

to

the

LARGE

position.

Block

the

shut-off

arm

in

the

"ON"

position.

Install

an

empty

7"

reel

(TEAC

RE-702)

on

the

left

reel

table.

Rotate

the

reel

and

wind

several

turns

of

string

counter-clockwise

around

the

hub.

Attach

spring

scale

to

string.

.

Place

the

unit

in

the

(

»

)

play

mode.

.

Pull

the

scale

away

from

the

reel

against

the

motor

torque

with

a

steady

smooth

motion.

7.

Note

the

scale

reading

while

it is

in

steady

motion.

(

The

string

must

not

rub

the

reel

flanges.)

8.

Adjust

R-155

as

needed

to

obtain

tension

of

450

+

20

(g-cm).

(calculated

value

using

T

=

R

X

W)

9.

Repeat

all

the

above

for

the

REEL-SMALL

position.

Reading

should

be

300

(g-cm).

FWNF

an

TAKE-UP

TORQUE:

1.

Place

the

REEL

size

switch

to

the

LARGE

position,

with

empty

reel

and

attached

spring

scale

on

the

right

reel

table.

.

Place

the

unit

in

the

(

»

)

play

mode.

3.

Allow

the

rotation

of

the

reel

to

slowly

draw

the

scale

toward

the

hub.

.

Hold

the

spring

scale

with

enough

force

to

allow

a

steady

reading.

5.

It

should

be

approx.

550

+

20

(g-cm).

If

adjustment

is

necessary,

slide

the

band

on

R~154.

(The

same

resistor

is

also

used

for

SMALL

REELS).

ho

Lf

NOTE

To

measure

torque

when

using

a

reel

with

a

hub

radius

of

other

than

3.0cm

refer

to

following

table;

FORMULA

FOR

TORQUE

CALCULATION:

T

(g-cm)=

R

XW

R:

radius

of

hub

(cm)

W:

gram

R155 R154

SPECIFICATIONS

TAKEUP

TORQUE

|

BACK

TENSION

550

+20

g-cm

450t20

g-cm

300

g-cm

PLAY-

LARGE

HMI

Fig.

8

Torque

Adj.

Location

6

HEAD

ALIGNMENT

HEAD

ASSEMBLY

(head

cluster)

is

adjusted

to

very

close

tolerance

at

the

factory

and

normally

requires

only

minor

alignments

or

adjustments

after

replacement

on

the

deck.

Complete

readjustment

of

the

HEAD

ASSEMBLY

will

be

necessary

when

an

individual

head

is

replaced.

HEIGHT

ADJUSTMENT

(4

track)

RECORD

HEAD:

The

record

head

pole

should

be

above

the

edge

of

a

threaded

tape

by

the

width

of

a

thin

pencil

line.

PLAYBACK

HEAD:

The

forward

playback

head

pole

should

be

even

with

the

top

(FORWARD)

of

a

threaded

tape.

PLAYBACK

HEAD:

The

pole

of

the

reverse

head

should

be

even

with

the

bottom

(REVERSE)

of

a

threaded

tape.

ERASE

HEAD:

Erase

section

should

be

a

heavy

pencil

line

above.

NOTE

A~7300

2

track

RECORD

and

ERASE

heads

are

centered

on

the

tape.

PLAYBACK

head

forward

section

is

a

heavy

pencil

line

above

the

edge.

Refer

to

the

illustration

below.

veveeeeeeeseeegeees

(Ab)

gAZIMUTH

ADJ.

SCREWS

©

“ue

1ct

ava.

screws

4

4T

4t

For

4

track

For

2

track

T-361

Fig.

9

Head

Configuration

and

Alignment

Screws

7

HEAD

ASSEMBLY

REMOVAL

AND

REPLACEMENT

.

Remove

power

from

the

unit.

.

Move

head

assembly

cover

by

removing

2

screws

on

the

left

and

right

end

of

the

head

cover

and

then

gently

move

cover

toward

the

top

of

the

deck.

.

Remove

4

mounting

screws

from

the

head

assembly.

.

Lift

head

assembly

and

remove

the

2

pin

jacks

and

the

9

pin

connector

mounted

on

the

rear

of

the

head

housing.

.

Lift

off

head

assembly.

.

Loosen

2

counter~sunk

screws

(A)

from

the

rear

plate

of

the

head

assembly

and

remove

2

small

screws

(B)

from

the

top

of

the

head.

Then

slide

off

the

shield

case

(C).

-

To

replace

a

single

head,

a

nut

driver

is

required.

Remove

the

2

nuts

(D)

on

the

defective

head

through

the

access

hole

provided.

This

releases

the

head

from

the

mounting

plate.

Fo,

»?

ite

g

Head

Mount

Plate

Fig.

10

Head

Replacement

After

the

head

is

replaced

be

sure

to

replace

the

shield

case

and

tighten

the

2

counter-sunk

screws

on

the

rear

of

the

head

assembly

plate.

Also

insure

that

the

spring

on

the

head

assembly

cover

is

properly

set

in

the

slot

.on

the

head

cover

bracket.

(Ref.

to

Parts

List).

-FEATURE

COMPARISON

CHART-

eee

teresa

A-7300

2T

|

Heads

fieads

GT

2

ch

7-1/2,

3-3/4

ips

15,

7-1/2

ips

Special

Features

Index

counter

No

memory

Rewind

Memory

Rewind

ADJUSTMENT

LOCATIONS

BIAS

RECORD

STABI-

RECORD

METER

PLAY

PLAY

MICL

MICR

SC

L

LINE

EO

IZER

LINE

55507460

T-340

Fig.10

Amp?

PC

Board

Locations

and

Adjustment

Points

NOTE:

All

Internal

adjustments

are

accessible

by

removing

bottom

cover.

Ref.

Nos

correspond

to

ref.

Nos

on

ELECTRICAL

ADJUSTMENT

Procedure

Charts

on

the

next

page.

oscilloscope

OUTPUT

REPRODUCE

(PLAYBACK)

Fig.12

Specified

Output

Level

Position

Decrease

2dB(2T)

Decrease

peak

\

348

(A-7300)

io

A

<

B

&

wn

ie

&

io]

=

a

jo)

1}

(3

mm

OUT

During

Record

Azimuth

Adjustment,

the

oscilloscope

pattern

angle

for

SOURCE

and

TAPE

monitoring

must

be

identical

in

order

to

maintain

a

0°

phase

difference

between

them.

BIAS

307

Fig.11

Head

Alignment

Fine

Adjustment

Set-Up

Fig.13

Bias

Limits

Chart

————