OTARI MX-505MKIV-2 Manual

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Operation

&

Maintenance

MX-5050MKIV-2,

Bill

Manual

MASTER

TAPE

RECORDER

I ,

, I

11'

.-.-.-.-.

lflfi!iJCJD

Part

No.

OS3-298

1!10!iJliJU

MX·5050

MKIV-2,

8111·2

MASTER

TAPE

RECORDER

OPERATION

AND

MAINTENANCE

MANUAL

THIRD

EDITION

Printed

:

May

1992

Otari,

Inc.

Ed

3

(WM)

Copyright

©

1992

Otari,

Inc

.

and

Otari

Corporation

Printed

in

Japan

This

manual

may

not

be

reproduced

by

any

means

without

written

permission.

s

CAUTION

To

prevent

fire

or

shock

hazard:

Do

not

expose

this

un

it

to

rain

or

moisture.

Do

not

remove

panels

(unless

instructed

to

do

so).

There

are

no

user-serviceable

parts

inside

.

Refer

servicing

to

qualified

service

personnel.

PLEASE

READ

THROUGH

THE

SAFETY

INSTRUCTIONS

ON

THE

NEXT

PAGE.

1.

Read

Instructions

2.

Retain

Instructions

3.

Heed

Warnings

4.

Follow

Instructions

5.

Water

and

Moisture

6.

Carts

and

Stands

7.

Ventilation

8.

Heat

9.

Power

Sources

10.

Grounding

or

Polarization

11.

Power

Cord

Protection

12.

Cleaning

13.

Non-Use

Periods

14

Object

and

liquid

Entry

15.

Damage

Requiring

Service

16.

Servicing

iv

SAFETY

INSTRUCTIONS

All

the

safety

and

operating

instructions

should

be

read

before

the

device

is

operated.

The

safety

and

operating

instructions

should

be

retained

for

future

.

All

warnings

on

the

device

and

in

the

operating

instructions

should

be

adhered

to.

All

operating

and

use

instructions

should

be

followed

.

The

device

should

not

be

used

near

water

-

for

example,

near

bathtub,

wash

bowl,

kitchen

sink,

laundry

tub,

in

a

wet

basement,

or

near

a

swimming

pool,

etc.

The

device

should

be

used

only

with

a

cart

or

stand

that

is

recommended

by

the

manufacturer.

The

device

should

be

situated

so

that

its

location

or

pOSition

does

not

interfere

with

its

proper

ventilation.

For

example,

the

device

should

not

be

situated

on

a

bed,

sofa,

rug,

or

similar

suriace

that

may

block

the

ventilation

openings;

or,

placed

in

a

built-in

installa-tion,

such

as

a

bookcase

or

cabinet

that

may

impede

the

flow

of

air

tl

l

rough

the

ventilation

openings

.

The

device

should

be

situated

away

from

heat

sources

such

as

radiator,

heat

registers

,

stoves

or

other

appliances

(including

amplifiers)

that

produce

heat.

The

device

should

be

connected

to

a

power

supply

only

of

the

type

described

in

tile

operating

instructions

or

as

marked

on

the

device

.

Precaut

i

ons

should

be

taken

so

that

the

grounding

or

polariza-tion

means

of

the

device

is

not

defeated

.

Power

supply

cords

should

be

routed

as

they

are

not

likely

to

be

walked

on

or

pi

nched

by

items

placed

upon

or

against

them,

paying

particular

attention

to

cords

at

plugs

,

convenience

recep-tacles,

and

the

point

where

they

exit

from

the

device.

The

de

v

ice

should

be

cleaned

only

as

recommended

by

the

manufacturer.

The

power

cord

of

the

device

should

be

unplugged

from

the

out-let

when

lett

unused

for

a

long

period

of

time.

Care

should

be

taken

so

that

objects

do

not

fall

and

that

liquids

are

not

sp

i

lled

into

the

enclosure

through

openings.

The

device

should

be

serviced

by

qualified

service

personnel

when:

A.

The

power-supply

cord

or

the

plug

has

be

en

damaged;

or

B.

Objects

ha

ve

falle

n,

or

liqu

id

has

been

spilled

into

the

appliance;

or

C.

The

appliance

has

been

exposed

to

rain;

or

D.

The

appliance

does

not

appear

to

operate

normally

or

ex

hibits

marked

change

in

performance;

or

E.

The

appliance

has

been

dropped

,

or

the

enclosure

damaged

.

The

user

should

not

attempt

to

service

the

device

beyond

that

described

in

the

operating

instructions

.

All

other

service

should

be

referred

to

qualified

personnel.

re

the

device

is

future

,

;

hould

be

Ir

bathtub,

wash

;wimming

pool,

ommended

by

1S

not

interfere

e

situated

on

a

'

penings;

or,

'

at

may

impede

radia

lor,

heat

produce

heat.

Ipe

described

on

means

of

walked

on

lar

aNention

they

exit

facturer,

et

when

left

e

not

e;

or

marked

r

ibed

in

~alified

COMMUNICATION

WITH

OTARI

FOR

SERVICE

INFORMATION

AND

PARTS

All

Otari

products

are

manufactured

under

strict

quality

control.

Each

unit

is

carefully

inspected

and

tested

prior

to

shipment.

If,

however,

some

adjustment

or

technical

support

becomes

necessary,

replacement

parts

are

required,

or

technical

questions

arise,

please

contact

your

Otari

dealer

or

contact

Otari

at

Ot

arl,

Inc.

Otari

Corporation

4-33-3

Kokuryo-cho

378

Vintage

Park

Drive

Chofu-shi,

Toky0182

Foster

City

Japan

California

94404

USA,

Phone

:

(0424)

81-8626

Phone

:

(415)

341-5900

Telex

:

J26604

OTRDENKI

Telex

:6503028432

MCI

UW

Fax:

(0424)

81-8633

Fax:

(415)

341-7200

Cable

:

OTAR

I

DENKI

TOKYO

Otarl

Deutschland

GmbH_

Olari

Singapore

Pte.,

Ltd

Rudolf-Diesel-S

tr

12

625

Aljunied

Road

0-4005

Meerbusch

2

(Oslerath)

#07

-

05

Aljunied

Industrial

Complex

FRGermany

Singapore

1438

Phone

:

(02159)

50861

Phone

:

(743)

7711

Telex

:

8531638

OTEL

0

Telex

,

RS

36935

OTARI

Fax

:

(02159)

1778

Fax:

(743)

6430

O

tari

(U

.

K.)

Limited

Unit

13,

Elder

Way,

Waterside

Drive,

Langley,

Slough,

Berkshire

SL3

6EP

United

Kingdom

Phone

:

(0753)580777

Telex

:

849453

OTARI

G

Fax:

(0753)

542600

Another

part

of

Otari

's

continuing

technical

support

program

for

our

products

is

the

continuous

revision

of

manuals

as

the

equipment

is

improved

or

modified

,

In

order

for

you

to

receive

the

information

and

support

which

is

applicable

to

your

eqUipment,

and

for

the

technical

support

program

to

function

properly

,

please

include

the

following

information,

most

of

which

can

be

obtained

from

the

Serial

number

label

on

the

machine,

in

all

correspondence

with

Otari:

•

Model

Number:

•

Serial

Num

ber

:

•

Date

of

Purchase:

•

Name

and

address

of

the

dealer

where

the

ma

c

hine

was

purchased

and

the

power

requirements

(voltage

and

frequency)

of

the

machine,

v

Table

01

Contents

Safety

Instructions

.

..

.......

....

.....

......

..

........

.......

......

.. v

..

...

....

....

..

........

....

vii

Communication

with

Otari

Section

1

Introduction

1.

1

MX-5050

Series

... ..

.....

.....

...

....

...

...

1-2

1.2

Using

This

Manual

....

..........

...

....

..

1-3

1.2

.1

OrgJnization

......

.

......

.

.......

.

..

...

......

1-3

1.2.2

Conventions

within

this

manual

.. .. .

...

.

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

....

....

1-4

Section

2

Instal/aion

2.

1

Unpa

c

king

and

Inspection

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

...

........

.. .

2-2

2.2

Audio

Signal

Conne

c

tion

..

. ....

...

.. ..

....

.

.......

2-3

2.2.1

Audio

Conn

ec

tors

.

.......

.....

.....

.. .

..

.....

..

..........

...

...

.

2-3

2.2

.2

BJlJnce

/

Unbalance

Adju

s

tment

. .

..

...

....

.......

.. ... ....

....

.

2-4

2.3

Switch

Position

Adjustment

. . .. ..

......

..

...

2-5

2.4

PCB

Assembly

Location

. ..

.....

..

...

.. ..

........

...

2·9

2.

4 1

MX-5050

Bill .

....

...

2-9

24.2M

X-

5050

MKIV2

.

2·11

2.5

Po

w

er

Connection

.

2-13

2.6

Fuse

Replacement

.......... .

...

... .

....

..

.....

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

....

2-

14

2.7

Speed

Conversion

(BIJI-2)

. .

.....

.

....

.....

.......

2-15

2.8

Equalizer

Change

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

2-15

Section

3

Controls

and

Indicators

3.

1

Tape

Transport

.

....

.. .

3-2

3.2

Transport

Control

Panel

.. .. ..

...

.. ...

3-3

3.3

Head

Assembly

......

....

. ....

3-6

3.4

Amplifier

Panel

...

..

3-7

3.5

Audio

Connector

Panel

.

3-9

3.6

Conne

c

tor

Pin

Assignment

s

......

..

.....

3-12

Section

4

Operation

4.1

Operation

Mode

Reference

Tables

....

..

....... .

..

........

..

..

4-2

4.2

Modes

of

Operation

..

...

..

..

..

.

..

4-3

4.2.1

TrJl1spol1

Mo

de

s . .. ..

.....

. .

....

......

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

4-3

4.2.2

Alidio

Channel

Mo

de

s

4-4

......

...

.. . ....

....

.. . ...

....

..

....

.......

Ma

y

1992

vii

Table

of

Contents

MX-SOSO

Operation

and

Maintenance

Manual

4.3

Operating

the

MX-5050

.. . ...

...

...

....

4-5

4.3.1

Placing

Reels

on

the

Machine

.....

.

.......

.. .. .. .

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

4-5

4.3.2

Threading

th

e

Tape

.. .. .

........

4·6

4.4

Operation

of

the

Transport

... ... .

........

4-7

4.4.1

Playing

Back

the

Tracks

....

4-7

4.4.2

Recording

the

Tracks

... ....

...

.. .... .

.......

4·

7

4.4.3

SEL-REP

Recording

...

.....

.. .. . ..

...

..

...

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

4·8

4.4.4

Fast

Wind

and

CUE

Monit

or ...

...

.

....

... .

.....

.

....

.... .....

....

4-8

4.4

.5

Tape

Editing

....

.

.........

4-9

4.4

.6

Using

the

Pitch

Contr

ol

Fe

a

ture

..

..

....

..

....

....

...

..

4-10

4.5

Locator

Operation

.

......

.. ... ...

...

.....

...

..

....

.

.......

..

......

4-

11

4.5.1

Storing

Tape

Locations

4-11

4.5.2

Sear

ch

Mode

.. ..

....

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

..........

4-11

4.5.3

Search

Play

Mode

.. 4-

12

4.54

Search

Zero

Mode

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

4-12

4.5.5

Search

Start

Mode

.. 4-

12

4.5.6

Repeat

Mode

. .. .

.........

..

..

....

........

4-13

4.6

Test

Oscillator

. .

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

4-

13

Section

5

Maintenance

5.1

Maintenance

Scheduling

...

5·2

5.2

Demagnetizing

...

5·2

5.3

Cleaning

the

Tape

Path

. .

...

.

...........

.

..

.

.....

......

5-3

5.4

Lubrication

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

....

.... ...

.....

5·4

Section

6

Transport

Adjustment

and

Parts

Replacement

6.1

Transport

Access

.....

6-2

6.2

Brake

Torque

Adjustment

. ..

....

6-2

6.3

Tape

Lifter

Adjustment

....

6-4

6.4

Capstan

Motor

Adjustment

and

Pitch

Control

Adjustment

... 6·5

6.5

Pi

nch

Roller

Pressure

Adjustment

.

6·6

6.6

Tape

Speed

Adjustment

..

6-8

6.7

Reel

Table

Height

Adjustment

. 6·9

6.B

Head

Assembly

Replacement

'...

..

.

..

... ... .

..

..

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

6-10

6.9

Head

Pos

i

tion

Adjustment

.....

6-11

J

viii

May

1992

hC

j

Maintenance

Manual

..

...

...

.......

4-5

'"

4-5

....

..

...

4-6

...

...

4-7

....

4-7

.. ..

4-7

.....

4-8

.....

..

...

4-8

.. .

4-9

..

4-10

....

4-11

. .

.....

4-11

...

. ...

4-11

...

.

4-12

. ..

..

..

4-12

.....

4-12

....

4-13

...

......

4-

13

....

5-2

5-2

....

5-3

'"

5-4

~menl

'" 6

-2

..

6-2

......

6-4

7ent

...

6-5

.

6-6

' ..

6-8

.. ..

6-9

6-10

6-11

MX-5050

Operat

i

on

and

Maintenance

Manual

Table

of

Contents

Section

7

Audio

Alignment

7.

1

Tools

and

Equipment

Required

.....

....

7-2

7.2

Block

Diagrams

.......

..

7-3

7.2

.1

Peak

Indicator

Level

Adjustment

..

7-3

7.2

.2

Test

Oscillator

Waveform

and

Level

Adjustment

.. . .. .. .

.....

.....

7-4

7.3

Reproduce

Adjustments

. .

7-5

7.3.1

Reproduce

Head

Azimuth

Adjustment

...

....

..

.... ...

........

....

7-5

7.3

.2

Reproduce

Level

Adjustment

.....

..

......

...

..........

......

7-6

7.3.3

Reproduce

Equalization

Adjustment

...

...

...

.

.......

.

7-7

7.4

Record

Electronics

Adjustments

........

... ...

....

...

..........

7-8

7.

4.1

Record

Bias

Level

Adjustment

....

.

.......

7-8

7.4

.2

Record

Head

Azimuth

Adjustment

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

7-9

7.4.3

Record

'level

Adjustment

.... .

...

.. .. .

7-10

74.4

Record

Equalization

Adjustment

.. .

.....

7-11

7.4.5

Low

Frequency

Reproduce

Equalization

Adlustment

.

7-11

7.

46

SEL-REP

Level

Ad

j

ustment

.. .

.....

.......

7-12

Section

8

Specifications

8.1

Tape

Transport

..

8-2

8.2

Electoronics

...

.. 8-3

Section

9

Exploded

Views

and

Bill

..'

.

9-2

-

9-19

MKIV-2

. ...

9-20

-

9-39

Appendix

Block

Diagram

Troubleshooting

Hints

(Electronics)

Troubleshooting

Hints

(Transport)

Index

Schematic

Diagrams

May

1992

Ix

May

1992

List

of

Figur

es

Figure

1-1

Exterior

Appearance

....

..

.

.....

...

..

......

... .

.....

1-2

Figure

2-1

Audio

Connectors

......

.....

.

.........

....

.....

.

.....

2-3

2-2

Balanced

/

Unbalanced

Connectors

..

..

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

2-4

2-3

Switch

Setting

on

Rear

Panel

...

....

.........

..

........

2-5

2-4

Controls

on

the

CONTROL

PCB

Assembly

.

......

....

..

2-6

2-5

PCB

Assembly

Location

(Bill)

.....

...

......

.

....

....

..

2-9

2-6

AIVIP

Section

Rotation

(Bill) .

....

... ..

.....

....

.......

2-9

2-7

CONTROL

PCB

Assembly

Rotation

(Bill) ..

......

... ..

2-10

2-8

PCB

Assembly

Location

(MKIV-2)

..

...

.. .. .. .. ..

....

.

2-11

2-9

CONTROL

PCB

Assembly

Rotation

(MKIV-2)

.. ..

.....

2-12

2-10

Power

Connect

i

on

...

.......

.....

.....

.....

.....

.. ...

2-13

2-11

AC

Line

Voltage

Connector

....

.....

...

...

..........

...

2-13

2-12

Fuse

Location

.. .. ..

....

....

......

....

.....

......

.....

.

2-14

Figure

3-1

Tape

Transport

... ...

....

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

.......

......

3-2

3-2

Transport

Control

Panel

..

..... .. ....

.......

..

...

.....

.

3-3

3-3

Head

Assembly

....

.. .

....

..

.....

......

... .. 3-6

3-4

Amplifier

Panel

(MKIV

-

2)

...

....

.... ..

.....

....

....

...

3-1

3-5

Audio

Connector

Panel

(Bill) .

..

....

... .

........

3-1

3-6

Audio

Connector

Panel

(MKIV-2)

... ..

......

.

.......

3-10

Figure

4-1

Tape

Threading

...... ... .

........

.....

....

.

...

.

.....

4-6

4-2

Edit

i

ng

a

Tape

. .. ... ..

.....

.......

4-10

Figure

5-1

Demagnetiz

i

ng

the

Head

...

.. .

......

...

.....

5-2

5-2

Cleaning

the

Head

.'

..

...

.....

...

5-3

5-3

Lubrication

... ..

...

.....

.....

.. .

5-4

Figure

6-1

Brake

Torque

Measurement

.

....

..

....

... .......

.....

6-2

6-2

Brake

Torque

Adjustment

.

.......

...

.....

...

..

......

..

6-3

6-3

Tape

Lifter

Adjustment

...

...

.....

.....

...

.. .. ..... 6-4

6-4

Waveform

on

Oscilloscope

...

.....

.....

..

....

....

....

6-5

6-5

Pinch

Roller

Pre

s

sure

Measurement

.....

........

... ..

6-6

6-6

Pinch

Roller

Solenoid

.

....

.....

.... ..

......

...

...

6-6

6-7

Pinch

Roller

Pressure

Measurement

......

.. ... ....

...

6-1

6-8

Re

el

Table

Height

Adjustment

....

..

.......

....

........

6-9

6-9

Head

Assem

bly

Repl

acem

ent

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

6-10

6-10

Height/Zenith

Adjustment

.. ....

...

..

....

...

...

6-11

6-11

Wrap

Adjustment.

... . ....

...

... ....

6-12

Figure

7-1

REC/REP

AMP

PCB

Assembly

..

..

.. ...

....

.

..

.... ..

....

1-4

7-2

Head

Adjustment

Screws

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

.....

.

1-5

7-3

Wave

Shape

on

the

Oscilloscope

.

....

....

......

....

..

1-6

7-4

Head

Assemb

ly

......

....

...

.. ..... .

.....

..... ..

1-9

7-5

Waveshape

on

the

Oscilloscope

...

.....

....

....

..

......

.

1-9

May

1992

xl