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2

track

MASTER

RECORDER

~A7300RX

Stereo

Tape

Deck

with

dbx

System

edits

=

TEAC

CORPORATION

51031760

20

Poares

oS:

1.

GENERAL

DESCRIPTION

TEAC’S

A-7300RX

is

a

high

quality

stereo

tape

deck

representing

a

new

Generation

in

the

design

and

construction

of

recording

equipment.

It

contains

all

of

the

features

which

made

the

earlier

A-7300

a

highly

rated

open

reel

tape

deck.

In

addition

the

A-7300RX

has

built-in

dbx*

noise

re-

duction

circuitry

for

superior

live

recording

capability.

This

deck

includes

dbx

type

I

Noise

re-

duction

system,

MPX

filter,

CUE

system,

PITCH

CONT,

EDIT

function

system,

etc.

We

have

produced

the

new

A-7300RX,

to

provide

complete

flexibility

in

selection

of

recording

tapes

and

to

provide

state

of

the

art

quality

in

your

deck.

The

basic

design

of

the

A-7300RX

is

highly

similar

to

that

of

the

A-7300.

Therefore

much

of

the

information

in

this

Service

manual

may

be

applied

to

the

A-7300

also.

*

dbx

noise

reduction

system

made

under

license

from

dbx,

Incorporated.

The

word

dbx

and

the

dbx

symbol

are

trademarks

of

dbx,

Incorporated.

NOTE

1.

When

placing

an

order

for

parts,

please

refer

to

the

PARTS

LIST

which

is

printed

separately

from

this

manual.

:

2.

File

the

PARTS

LIST

manual

together

with

this

SERVICE

MANUAL,

Future

TECHNICAL

INFORMATION

sheets

should

also

be

kept

with

these.

3.

Section

numbers

and

Fig.

reference

numbers

are

not

directly

related.

TABLE

OF

CONTENTS

1.

GENERAL

DESCRIPTION

.............-

3

2.

SPECIFICATION

AND

SERVICE

DATA

.....

4—5

3.

TOOLS

FOR

TESTING

AND

MAINTENANCE

.

5

4.

PARTIAL

DIS-ASSEMBLY

..........-.--

6-9

5.

PARTS

LOCATION

..........0---0000-

10

6.

SERVICING

AND

MAINTENANCE

........

11

7.

HEAD

REPLACEMENT

AND

ALIGNMENT...

—

12

8.

MEASUREMENT

AND

ADJUSTMENT-

MECHANICAL

........00-00

0c

eee

eee

13-16

9.

BLOCK

AND

LEVEL

DIAGRAMS

.........

17

10.

MEASUREMENT

AND

ADJUSTMENT-

ELECTRICAL

ita

ogee

cece

wt

week

2

18-27

11.

TROUBLESHOOTING

.-.......--..----

28-29

12.

DB

CONVERSION

TABLE

AND

TENSION/

TORQUE

FORMULA

.................-

30

2.

SPECIFICATIONS

AND

SERVICE

DATA

2-1

SPECIFICATIONS

Track

System

Reel

Size

Tape

Speed

Inputs

(Level

and

Impedance)

Outputs

(Level

and

Impedance)

Playback

Equalization

Heads

Noise

Reduction

System

Motors

Bias

Frequency

Power

Requirement

Dimensions

(WHD)

Weight

1/2-Track,

Two-channel

Stereo

or

mono

10-1/2"'

and

7”

15

ips

(38

cm/sec)

and

7-1/2

ips

(19

cm/sec),

0.5%

Line:

Specified

Input

Level:

—8

dB

(308

mV)

/50k

ohms

Min.

Input

Level:

—18

dB(

97

mV)

MIC:

Specified

Input

Level:

—60

dB

(0.774

mV)

30k

ohms

Min.

Input

Level:

—70

dB

(0.244

mV)

Output

(SOURCE/TAPE):

Specified:

—8

dB

(308mV)

/10k

ohms

Maximum:

—2

dB

(615

mV)

Output

(ENCODER);

Specified:

8

dB

(308mV)

/50k

ohms

Headphones:

—24

dB

(49

mV)

/8

ohms

15

ips

(38

cm/sec):

NAB

(50

u

sec,

3180

p

sec)

7-1/2

ips

(19

cm/sec):

NAB

(50

y

sec,

3180

sec)

Three:

Erase,

Record

and

Playback

dbx

System

type

1

One

direct

Drive

DC

Servo

Capstan

Motor,

Two

Eddy

Current

Induction

Reel

Motors

100

kHz

(+5

kHz,

Push-Pull

oscillator)

100/117/220/240

VAC,

50/60

Hz,

83W

Transport:

470

x

455

x

300

mm

(18-1/2"

x

17-15/16"

x

11-13/16")

Amplifier:

470

x

205

x

310

mm

(18-1/2”

x

8-11/16"

x

12-1/4”")

Transport:

28

kg

(61-3/5

Ibs)

net

Amplifer:

13

kg

(28-3/5

lbs)

net

2-2

SERVICE

DATA

—MECHANICAL—

Tape

Speed

Deviation

and

Drift

Wow

and

Flutter

Pinch

Roller

Pressure

Reel

Torques

3,000

Hz

+30

Hz,

within

20

Hz

Playback:

0.05%

(WRMS)

at

15

ips

0.06%

(WRMS)

at

7-1/2

ips

Overall:

0.12%

(RMS)

at

15

ips

0.15%

(RMS)

at

7-1/2

ips

1.8

kg

to

2.2

kg

(4.0

to

4.8

Ibs)

TAKE

UP

TORQUE;

REEL

SW

TAKE-UP

LARGE

|

530

to

570

gcm

(7.4

to

8.0

oz-inch)

SMALL

_

|

330

to

370

gcm

(5.0

to

5.1

oz-inch)

BACK

TENSION;

REEL

SW

BACK

TENSION

LARGE

|

430

to

470

g

cm

(6.0

to

6.6

0z-inch)

SMALL

|

280

to

320

g

cm

(3.9

to

4.6

oz-inch)

Con’t

on

next

page

Fast

Forward

Torque

Fast

Forward/Rewind

Time

Brake

Torque

Pitch

Control

Counter

Accuracy

2-3

SERVICE

DATA

—ELECTRICAL—

Frequency

Response

Signal-To-Noise

Ratio

Erase

Efficiency

Crosstalk

Rejection

Stereo

Channel

Separation

Total

Harmonic

Distortion

1,900

g

cm

+100

g

cm

(26

oz-inch)

150

seconds

for

1,800

foot

tape

2,200

g

cm

+100g

cm

(31

oz-inch)

3,000

Hz

+5%

or

more

+1.5%

at

15

ips

play

mode

Refer

to

Frequency

Response

Limits

chart

Overall:

60

dB

or

higher

with

dbx,

48

dB

or

higher

without

dbx

65

dB

or

more

at

1

kHz

signal

(measured

with

input

10

dB

higher

than

the

specified

Input

Level)

35

dB

or

more,

adjacent

track

at

125

Hz

45

dB

or

more,

channel

to

channel

at

1

kHz

Overall:

0.8%

with

dbx

at

1

kHz

normal

operating

level

NOTE:

Service

Data

were

determined

using

TEAC

YTT

Series

Test

Tape.

Improvements

may

result

in

feature

or

specification

and

service

data

changes

without

notice.

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

for

those

not

listed

here.

If

any

test

instrument

listed

here

is

not

available,

a

close

equivalent

can

be

used.

WOW

AND

FLUTTER

METER........

AC

VTVM

..

0...

ee

cee

eee

ees

DIGITAL

FREQUENCY

COUNTER

....

BAND-PASS

FILTER

.........-.---

OSCILLOSCOPE

.........----005:

AF

OSCILLATOR

.........---++--

ATTENUATOR

....---

+--+

seer

eres

DISTORTION

ANALYZER

.........-.-

TOOLS

..

1

cee

ee

ee

ees

HEAD

DEMAGNETIZER

.........--

TEAC

TEST

TAPE

........----0555

TEAC

EMPTY

REEL

.......---.----

Meguro

Denpa

Sokki

K.K.,

Model

MK-668A

or

D

&

R

Co.,

Model

FL4B

Hewlett-Packard

Co.,

Model

400E

(0.1

mV

—

300

V)

Range;

10

Hz

—

100

kHz

1

kHz

narrow

band-pass

type

General

Purpose

10

Hz

—

100

kHz

General

Purpose

Basic

Freq.

400

Hz/1

kHz

Spring

scale;

O—-4

kg

(0-8

Ibs)

O—1

kg

(O—2.2

Ibs)

Hex

head

Allen

Wrench,

Plastic

alignment

tool,

Load

resistor

non-inductive

type

8

ohm/1

W

TEAC

E-3

or

equivalent

YTT-1003

(7-1/2

ips),

YTT-1004

(15

ips)

for

Playback

Alignment

test,

YTT-8013,

YTT-8003

and

YTT-8023

for

Recording

test,

YTT-2003

(7-1/2

ips),

YTT-2004

(15

ips)

for

Tape

Speed

and

Wow/

Flutter

test

RE-702

(2.5”

dia,

hub),

RE-701

(4”

dia,

hub)

4.

PARTIAL

DIS-ASSEMBLY

4-1

REMOVING

TAPE

TRANSPORT

CASE,

AMPLIFIER

CASE

AND

CASE

LEGS

TAPE

TRANSPORT

AMPLIFIER

See

illustration

for

complete

dis-assembly

instructions.

Fig.

4-1

Removing

Tape

transport

and

Case

legs

’

Fig.

4-2

Removing

Amplifier

and

Case

lgs

4-2

HEAD

HOUSING

BASE

AND

HEAD

ASS'Y

REMOVAL

HEAD

HOUSING

BASE

REMOVAL

5:

6.

1.

Remove

power

from

the

unit.

2.

Open

the

head

housing

(A).

3.

4.

Remove

head

housing

Link

ass’y

(C)

by

removing

4

Remove

Name

Plate

(B).

screws

(remove

with

spring

(D)

and

Anti-spoiler

(E).

Remove

head

housing

Base

(F)

by

removing

2

mounting

screws.

Gently

move

head

housing

base

(F)

toward

the

top

of

the

deck.

HEAD

ASS’Y

REMOVAL

7.

8.

NOTE:

Remove

4

mounting

screws

from

the

head

assembly

(G)

and

remove

the

2

pin

jacks

and

the

9

pin

connector

mounted

on

the

rear

of

the

head

housing.

Lift

off

head

assembly.

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

(D)

on

the

head

housing

is

properly

set

in

the

slot

on

the

head

housing.

Fig.

4-3

Head

Housing

Base

and

Head

ass’y

Removal

4-3

REMOVAL

OF

REEL

MOTORS

1.

2.

3.

Loosen

2

set

screws

(hex

head)

in

Reel

Turntable

ass’y

(A)

and

2

in

the

Brake

Drum

(C).

Lift

off

these

parts.

Disconnect

the

4

motor

wires

from

terminals

and

re-

lease

wire

harness

straps.

Remove

3

screws

securing

the

Brake

ass’y

(D)

to

the

mo-

tor.

NOTE:

Use

care

not

to

bend

the

brake

band

or

brake

shap-

ing

retainer

during

removal.

4.

Remove

4

screws

securing

Reel

motor

(B)

to

chassis

through

the

front

panel.

Fig.

4-4

Reel

Motor

Removal

44

REMOVAL

OF

TENSION

ARM

(RIGHT)

AND

DRIVE

ROLLER

ASS’Y

.

Remove

power

from

the

unit.

.

Remove

Tape

transport

Case

(See

step

4-1

on

page

6).

.

Loosen

1

set

screw

in

Drive

Roller

Pulley

(A).

_

Lift

off

the

Drive

Roller

ass’y

(B).

Watch

for

the

spacer.

_

Remove

4

screws

in

Tension

Arm

Ring

(C).

_

Lift

off

these

parts,

Tension

Arm

Ring

(C)

and

Tension

Arm

(D).

Dunk

wn

Fig.

4-5

Right

Tension

Arm

and

Drive

Roller

ass’'y

Removal

4-5

REMOVAL

OF

TENSION

ARM

(LEFT)

1.

Do

steps

1

and

2

of

Section

44.

2.

Unscrew

Cap

(A)

from

front

panel.

3.

Remove

4

screws

in

Tension

Arm

ass’y

(B).

Lift

off

these

parts.

NOTE:

When

replacing

Tension

Arm

ass’y

be

sure

to

posi-

tion

tape

guide

section

in

the

original

position.

Fig.

4-6

Left

Tension

Arm

Removal

4-6

REMOVAL

OF

PINCH

ROLLER

ASS’Y

AND

PINCH

ROLLER

ARM

1.

Do

steps

1

and

2

of

Section

4-4.

2.

Loosen

3

set

screws

in

Solenoid

Arm

(A).

3.

Lift

off

Pinch

Roller

Arm

(B)

from

front

panel

Watch

for

the

washers.

T-559

Fig.

4-7

Pinch

Roller

ass‘y

Removal

4-7

REMOVAL

OF

CAPSTAN

MOTOR

ASS’Y

1.

Do

steps

1

and

2

of

Section

4-4.

2.

Dis-connect

Multi

11P

Socket

(B).

3.

Remove

3

mounting

screws

on

Motor

ass’y.

4.

Carefully

lift

off

the

Motor

ass’y.

(A).

Capstan

shaft

tolerance

adj.

Refer

to

step

8-3

on

page

14

for

more

detailed

explanation

T

-597

Fig.

4-8

Capstan

Motor

ass’y

Removal

10

5.

PARTS

LOCATION

Power

Brake

Solenoid

R156

Transformer

7

4

‘e

DLL

“Mm

|

me

Sees

i

:

‘

4

Voltage

Selector

and

Frequency

SW

Reel

Motor

(Right)

Reel

Motor

(Left)

C155

Reel

Motor

pee

Stablilizer

Unit

B

Solenoid

Power

Unit

Drive

Unit

Stabilizer

Unit

Capstan

Motor

ass’y

Impedance

Roller

Drive

Roller

Fig.

5-1

—

Mechanical

Section

—

Fig.

5-2.

—

Amplifier

Section

—

Connections

Location

6.

SERVICING

AND

MAINTENANCE

6-1

CLEANING

6-3

TEAC

MAINTENANCE

FLUIDS

TEAC

TZ-261A

and

TZ-261B

may

be

used

for

following

places.

TZ-261

CORUER

Ni

TZ-261B

TZ-261A

Pinch

roller

rubber

Counter

belt

Brake

drums

Heads

Capstan

shaft

Tape

run

guides

6-2

LUBRICATION

A

a

: :

Fig.

6-2

TZ-261

Tape

Recorder

kit

Under

normal

operation,

lubriaction

is

required

only

once

each

year.

Operate

the

deck

for

30

minutes

to

1

hour

immediately

prior

to

oiling.

After

oiling,

keep

the

deck

in

the

upright

position

for

3

to

4

hours

to

allow

thorough

penetration

of

the

oil.

Approximately

once

each

year

or

after

2,000

hours

of

use,

apply

TEAC

TZ-255

Lubricating

Oil

to

the

following

places

only;

Pinch

roller

shaft

.-....---

1

drop

(Remove

cap)

Capstan

shaft...

---------

2

drops

(Remove

the

dust

cap

for

access

to

the

oil

pit)

NOTE:

Neither

the

reel

motors,

which

utilize

oilless

metal

bearings,

nor

the

direct

drive

DC

capstan

motor

require

oiling.

Therefore,

no

oiling

access

tubes

are

provided.

Excessive

oiling

will

scatter

oil

inside

the

deck.

Check

for

slippage

and

clean

all

parts

inside

the

deck

before

operating

after

lublication.

Check

for

oil

emission

after

operation

and

before

returning

6-4

DEMAGNETIZATION

OF

HEADS

deck

to

the

customer.

Fig.

6-3

TZ-225

Oil

kit

If

the

record

or

Playback

heads

becomes

magnetized,

noise

will

increase

and

tonal

fidelity

will

deteriorate

For

this

(GD)

reason

it

is

advisable

to

use

non-magnetic

tools

when

work-

ing

near

the

heads.

If

the

heads

heve

had

any

con

tact

with

current

or

magnetized

metal

parts,

demagnetize

them

with

4

a

TEAC

E-3

eraser

or

Equivalent.

Fig.

6-1

Capstan

Shaft

and

Pinch

Roller

Shaft

Oiling

Points

Fig.

6-4

TEAC

E-3