OTARI MTR-90 Instrucciones de funcionamiento

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053-039

TR-90

MASTER TAPE RECORDER

OPERATING

AND

MAINTENANCE

MANUAL

PA

GE

1- 1

1 - 2

2- 1

2- 1

2- 9

2-

11

2-14

3- 1

3- 7

4-1

4- 1

4- 2

4- 3

4- 5

4- 6

4- 7

4- 8

4- 9

5- 1

5- 1

5- 2

5- 5

5- 6

5- 7

5- 7

5-8

5-

10

5-

12

5-

13

5-18

5-

22

5-

22

5-

22

5-

24

6- 1

6- 3

6- 4

SECTION

I

1.1

1 . 2

II

2.1

2 . 2

2 . 3

2.4

2 . 5

III

3.1

3.2

IV

4 . 1

4.2

4 . 3

4.4

4.5

4 . 6

4 . 7

4 . 8

4 . 9

v

5.1

5.2

5 . 3

5 . 4

5 . 5

5.6

5 . 7

5 . 8

5 . 9

5.10

5 .

11

5 .

12

5.13

5 .

14

5.15

5 .

16

VI

6 . 1

6 . 2

6 . 3

OTARI

MTR

- 90

MANUAL

TABLE OF CONTENTS

TOPIC

INTRODUCTION

OTARI

MTR

-

90

Master

Tape

Machin

e

Using

this

Manual

INSTALLATION

Preliminary

Inspection

Assembly

of

Remote

Contro

l

Box

to

its

Stand

Assembly

of

Remote

Control

Bo

x

and

Auto

L

ocator

to

Common

Stand

Connections

BASIC

OPERATION

AND

FUNCTIONAL

CHECKOUT

Transport

Functional

Checkout

Remote

Control

Bo

x

(Remote

Box)

and

Audio

Electronics

Functional

Checkout

AUDIO ALIGNMENT

General

Description

Demagnetizing

the

Heads

and

Tape

Guidance

Path

Cleaning

the

Tape

Path

Repro

Amp

Alignment

Sync

Amp

Alignment

Bias

Alignment

Record

Alignment

Phase

Compensation

Gain

Structure

TRANSPORT ALIGNMENT

General

Description

Head

Geometry

Transport

Cover

Plate

Removal

and

Replacement

Swing

Arm

Travel

Tape

Arming

Solenoids

Fast

Forward/Rewind

Damping

Solenoids

Swing

Arm

Tension

Tape

Lifter

Mechanism

Brakes

Reel

Turntable

Height

Reel

Tension

Servo

Capstan

Servo

Adjustment

of

Transport

PCB

Assembly

Adjustment

of

Master

CPU

PCB

Assembly

Adjustment

of

I/O

PCB

Assembly

Adj

ustment

of

Bias

Control

PCB

Assembly

OPERATION

General

Recording

Initial

Tracks

Playback

of

Initial

Tracks

v

PAGE

6

-4

6- 5

6- 6

6- 7

6- 7

6- 7

6- 8

6- 8

6-

10

6-

10

6-

10

6-

11

7- 1

7- 3

7- 3

7- 3

7- 4

7- 4

7- 4

7- 4

7-5

7- 5

7- 5

7- 6

7- 6

7- 7

7- 8

7

-9

7- 9

7- 9

8- 1

8- 1

9- 1

9 - 1

9- 1

9- 2

9-2

9- 2

9- 3

9- 4

9- 4

SECTION

6 . 4

6 . 5

6 . 6

6 . 7

6 . 8

6 . 9

6 .

10

6 .

11

6 .

12

6 .

13

6 .

14

6 .

15

VII

7 . 1

7 . 2

7 . 3

7 . 4

7 . 5

7 . 6

7 . 7

7 . 8

7 . 9

7 .

10

7 .

11

7 .

12

7 .

13

7 .

14

7 .

15

7.16

7 .

17

7 .

18

VIII

8 . 1

8 . 2

IX

9 . 1

9 . 2

9 . 3

9 . 4

9 . 5

9 . 6

9 . 7

9 . 8

9 . 9

OTARI

MTR

-

90

MANUAL

TABLE OF CONTENTS

(continued)

TOPIC

Sel

-

Rep

Recording

(Overdubbing)

Sel

-

Rep

Recording

(Punch

-

Ins)

Rehearsal

of

Overdubs

and

Punch

-

Ins

Mix

down

Use

of

the

Cue

Button

and

knob

Stop

Erase

Use

of

the

Variable

Speed

Mode

Use

of

an

External

Speed

Reference

Voltage

Conversion

Frequency

Conversion

Bed

Out

Serial

I/O

AUTO

LOCATOR

General

Tape

Time

Locate

Time

Stop

Watch

Keyboard

Numerals

Shift

Left

and

Shift

Right

Load

Memory

Store

Memory

Recall

+/

-

Key

Direct

Store

,

Direct

Search

and

All

Clear

Zero

Set

Search

Zero

Search

Shuttle

Auto

Rewind

Transport

Controls

Examples

of

Auto

Locator

Operation

16/24

TRACK

CONVERSIONS

General

16

to

24

Track

,

or

24

to

16

Track

Converston

Procedure

CIRCUIT

DESCRIPTIONS

Pl

ayback

Head

and

Preamp

Speed

Selection

and

High

Frequency

Playback

EQ

Low

Frequency

Playback

Equalization

Sync

Playback

Output

Stage

Input

Circuitry

Audio/Bias

Mixing

Circuitry

Erase

Head

Driver

Reel

Control

Board

•

Vl

•

PAG

E

10-1

1 0- 2

1

0-2

10

- 3

10-

3

10-4

10-4

10-

5

11-1

11-2

11

- 3

11

- 3

12

- 1

12-2

13

-1

1 3- 2

OTAR! MTR-90

MANUAL

TABLE

OF

CONTENTS

(continued)

SECTION

TOPIC

x

10.l

10

. 2

10

. 3

10

. 4

10

. 5

10.6

10

. 7

10

. 8

XI

11

. 1

11

. 2

11

. 3

11

.4

XII

12

. 1

12

. 2

XIII

13

. 1

13.2

MAINTENANCE

General

Removing

and

Reinserting

Printed

Circuit

Boards

Reel

Motor

Replacement

Brake

Pad

Replacement

Meter

or

Meter

Lamp

Replacement

Capstan

and

Tacho

Roller

Replacement

Head

Shield

Position

Adjustment

Cleaning

and

Lubrication

SPECIFICATIONS

Tape

Transport

Electronics

Physical

Accessories

PARTS

LISTS

AND

DRAWINGS

General

Parts

Lists

PARTS

LISTS

AND

P.C

. B. ASSEMBLIES

General

Parts

Lists

• •

Vl.l.

•

SECTION I . INTRODUCTION

1 . 1 OTARI MTR-90

MASTER

TAPE

MACHINE

8 ,

16

or

24

Track

Recorder/Reproduce

r

The

Otari

MTR

-

90

records

and

reproduces

8-

track

,

16

-

track

,

or

24

-

track

, l "

or

2 "

master

tapes

(as

determined

by

the

head

as

-

sembly

and

the

quantity

of

audio

circu

i t b

oards

inserted

in

the

machine

' s

card

cage)

.

Tape

handling

i s

gentle

,

yet

positive

and

fast

,

thanks

to

a

symmetrical

,

constant

-

tension

tape

path.

Tension

is

distributed

uniformly

across

the

tape

surface

by

a

pair

of

wide

diameter

pinch

-

rol

l

erless

s

pindles

,

the

capstan

and

the

tachometer

.

This

design

eliminates

cont

a

ct

between

the

tape

dr

ive

and

the

oxide

,

allowing

virtual

l y

un

l

imited

safe

passes

of

your

valuable

master

tapes

.

Mechanical

integrity

and

long

-

term

sta

-

bility

are

ensured

by

a

massive

,

precision

·

top

plate

and

a

uni

-

tized

,

welded

steel

chassis

.

Ultra

-

high

torque

DC

servo

reel

motors

provide

fast

winding

,

even

with

1

4"

reels

,

and

ensure

rapid

start-ups

to

full

stable

record/p

l

ay

speed

.

The

entire

machine

is

modular

in

construction

,

including

the

computerized

transport

con

-

trol

logic,

for

high

reliability

and

serviceability

.

The

MTR-90

is

loaded

with

features

,

such

as

selection

for

external

speed

reference

,

vari

-

speed

,

or

2

crystal

-

locked

speeds

(15

or

30

ips

-

38

cm/s

or

76

cm/s)

.

The

reels

can

be

gently

rocked

back

and

forth

for

editing

with

the

easy

-

to

-

use

Cue

control

knob

,

or

by

hand

turning

the

capstan

.

Pushbuttons

also

provide

for

tension

release

and

retraction

of

the

motor

-

driven

head

shields

to

expedite

editing

. A

practical

splicing

block

as

well

as

a

spot

erase

function

for

erasure

of

unwanted

tracks

,

are

also

provided

in

front

of

the

head

assembly

.

Included

as

standard

equipment

is

the

Model

CB

-

113

Remote

Control

Box

. .

rt

duplicates

the

transport

control

buttons

,

and

provides

individual

function

selections

for

each

channel

(Repro/

Sel

-

Rep/Input),

master

function

selections

for

All

Inputs

,

All

Sel/

Rep

and

All

Repro

at

once

,

and

a

master

"

All

Safe

"

function

.

Also

located

on

the

remote

control

bo

x

are

a

speed

reference

(VARI ,

FIX

,

EXT)

selector

switch

, a

pitch

control

knob

,

and

a

digital

readout

indicating

speed

by

%

or

IPS

.

The

optional

CB

-

115

Memory

Locator

attaches

to

the

same

stand

as

the

CB-113

,

and

provides

independent

readouts

and

controls

for

the

elapsed

tape

time

,

locate

time

,

and

has

a

built

-

in

stop-

w

atch

.

The

locator

also

features

10

keyboard

assignable

memories

,

(key

-

board

or

direct

tape

time

memor

i

es)

and

their

direct

recall

, a

shuttle

function

for

repeating

any

desired

segment

of

the

tape

,

zero

cue

,

and

other

time

saving

functions

. ·

The

electronics

are

highly

refined

. A

single

-

card

approach

has

been

used

for

the

record/play

audio

and

bias

circuits

for

each

channel

,

simplifying

setup

and

service

.

Active

mixing

of

audio

and

bias

in

the

record

circuitry

,

proper

utilization

of

high

sle

w

rate

IC

op

-·

amps,

and

discrete

components

at

critical

stages,

al

l

ensure

the

cleanest

and

quietest

of

recordings

.

There

are,

of

1

-1

•

course

,

individual

channel

calibrations

for

BIAS

,

as

well

as

low

and

high

speed

EQ

and

GAIN ,

also

a

low

&

high

speed

record

PHASE

COMP

trinuner

is

provided

for

improving

complex

wave

-

form

charac-

teristics

.

In

addition

, a 3-

position

Master

Bias

selector

(with

3

corresponding

trinuners)

enables

the

entire

machine,

once

aligned

,

to

be

rapidly

switched

to

accommodate

the

bias

requirements

of

different

tapes

.

For

further

convenience,

a

single

test

input

jack

applies

your

test/alignment

signal

to

all

inputs

.

There

is

automatic

switching

between

sync

reproduce

and

input

monitor

when

the

unit

is

switched

between

play

and

stop

,

fast

winding

modes

and

of

course

rec/ready

to

record

enable

.

Although

dip

-

switches

on

the

transport

control

circuit

card

permit

these

logic

functions

to

be

changed

to

suit

the

preference

of

the

user

.

Stable

ACTIVE

BALANCE

Circuitry

is

adopted

in

the

input

cir

-

cuit

.

In

the

output

circuit

,

the

balance

to

unbalance

selection

can

be

obtained

by

a

switch

.

(Optionally,

either

transformer

out

-

put

or

input

can

also

be

ordered.)

In

addition,

a

SERIAL

I/O

CONNECTOR

conforming

to

the

RS-232C

standard

is

provided

for

direct

conversation

with

a

computer.

CAUTION:

The

DC

reel

motors

develop

substantial

torque

.

Never

place

a

hand

,

clothing

or

other

objects

inside,

atop

or

ne

ar a

reel

or

swing

arm

when

actuating

the

tape

motion

controls.

When

using

the

Remote

Session

Controller

or

Auto

Locator,

always

make

sure

anyone

near

the

transport

is

aware

of

th

e

potential

hazard

posed

by

the

high

torque

motors,

which

are

capable

of

increasin

g

tape

tension

with

sufficient

speed

and

severity

to

damage

the

swing

arms.

1.2

USING

THIS

MANUAL

The

various

sections

topics

(i.e.

, SECTION

II

.

SECTION

2.2

INSPECTION) .

topics

are

numbered

(1,

2,

topics,

the

details

may

be

...

etc

. ) .

of

the

manual

are

divided

by

major

INSTALLATION) ,

and

by

sub-topics

(i.e

.,

Within

a

sub-section,

the

steps

or

...

etc.),

and

within

these

steps

or

further

divided

alphabetically

(A , B,

Normal

parentheses

( )

are

used

for

examples,

and

paren

-

thetic

comments

.

Square

brackets

[ ]

are

used

for

references

to

callouts

in

certain

illustrations

.

The

square

brackets

in

a

given

sub

-

section

are

either

all

referenced

to

a

particular

illustration

,

as

noted

in

that

sub

-

section

,

or

are

individually

referenced

(i

. e

.,

Fig

.

1-3

, [B] ,

meaning

callout

"

B"

in

Figure

1-3).

Generally

,

we

have

used

all

upper

case

type

to

describe

a

particular

switch

or

control

when

that

item

is

similarly

labeled

on

the

actual

equipment

(i.e

.,

the

PLAY

button)

.

Where

a

switch

or

function

is

not

labeled

,

or

the

reference

is

less

clear

,

we

capitalize

only

the

first

letter

of

the

item

(i.e.

,

the

Cue

con-

trol

knob

near

the

head

assembly)

.

Machin

e

status

or

operating

modes

are

usually

described

with

an

upper

case

first

letter

(i.e.

,

1-2

you

press

the

PLAY

button

to

place

the

machine

in

Play

mode)

.

The

functional

checkouts

in

Section

III

should

be

carefully

performed

when

the

MTR-90

is

first

installed.

You

will

probably

learn

a

good

deal

about

how

the

machine

operates

while

following

this

procedure,

but

it

is

not

intended

as

a

guide

for

recording

and

editing;

that

information

is

presented

in

a

more

useful

format

in

Section

VI.

Although

this

manual

is

intended

for

l"

SCH,

2"

16CH

and

2"

24CH

operations,

the

following

description

deals

only

with

2"

24CH

operation.

Please

note

that

all

explanations

apply

to

l"

SCH

and

2"

16CH

as

well,

even

if

remarks

to

that

effect

cannot

be

found.

We

encourage

you

to

read

this

manual

carefully

now,

and

to

again

review

it

after

you

have

had

a

while

to

become

familiar

with

the

MTR-90 .

The

more

you

know

about

your

machine,

the

more

you

can

benefit

from

its

many

versatile

features.

-

Figure

1

-1.

MTR-90

Master

Tape

Recorder

.

1 - 3

•

..

Figure

1- 2 .

Tape

Transport

Controls.

Figure

1-

3.

Cue

Button

and

Cue

Control

Knob.

1 - 4

•

Figure

1-4.

VU

Meter

Panel

(24-track

or

16/24

track

version).

...

..

...

• •

• -

...

...

•

...

• • • • • • • • • l •

--•

...

..

.

...

.,,...

••

w -•

•

..

",,.,..

..

••

··"'~

..

ft

. ,

...

••• •

..

Fi

gure

1- 5 .

MTR

-

90

Upper

and

Lower

Circuit

Card

Cages.

1-5

•

.

t

t

t

'

t

t

'

~

'

'

'

t

t

\

• '

• t

t ' ' '

t t ' t

' •

~

t • t ' t

i t ' ' ' '

' t ' t

' ' ' ' '

' "

' ' I '

c.

\ t t ' '

t '

~

'

t ' '

' ' '

i ' ' • '

' ' ' '

' ' " ' '

' ' t

\ " ' '

' ' ' t '

t ' :

~

' ' }

Figure

1-6.

Removal

of

PCB

from

Upper

Card

Cage

(24

-

track

cards

illustrated).

--------

1 a • 1 • 1 • •

•

-

Figure

1-7.

MTR

-

90

Power

Switch,

Circuit

Breakers,

and

Pilot

Lamps.

CAUTION:

NEVER

ATTEMPT

TO

OPERATE

THE

MTR

-

90

IF

ANY

OF

THESE

PILOT

LAMPS

DOES

NOT

LIGHT

WHEN

POWER

IS

SWITCHED

ON.

CHECK

THE

CIRCUIT

BREAKERS,

AND

RESET

IF

POSSIBLE .

1 - 6