Nakamichi BX-2 Manual de usuario

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2

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Nakamichi

Service

Manual

Nakamichi

BX-2

2

Head

Cassette

Deck

Pn

BCP sme

CONTENTS

1

GONOr

AE

4

sl

fs

55d

Gnd

eGR

Saya

bigs

Soe

ee

a

aw

Las

eR

RL

ST

Gown

Osco

leeEsae,

Sto,

Bieta

hs ak

oP

ASME

RI

Gs

atte

Moadite

rasta

Sedona

9,

‘Mechanical

Adjustments:

....

56.05.06

6

605

ese

oe

bre

ee

RS

BED

we

EIS

OO

ON

ee

we

eg

bases

2.

1.

Tape

Guide

Height

Check

for

Record/Playback

Head

and

Erase

Head.

.........-.02200000-

2.

2.

Head

*Base:Stroke:

Cheek:

ie

seciic

ts

3

ater

aes

seen

ALG.

wag

a

aied

Ole

Saas

BEE,

teclan

ab

foes

aoa

aS;

ieee

2.

3.

Record/Playback

Azimuth

Alignment

and

Height

Check

.....

0...

0.

ccc

ec

ee

te

eee

2.

4.

Pressure

Adjustment

of

Pressure

Roller...

0...

0...

cee

ee

ee

ne

ete tee

eens

2.

5.

Tape

Travelling

Check

oscg-5.5

6.008

sewn

S

baad

b

8a

ee

Bak

b,

Dawe

the

Male

a

ra

Ber

Sas

Beare

eae,

2

2.

6.

Eject

Damper

Adjustment

...

0...

2...

ee

ete

eee

ee

tee

eee

eens

2.

7.

Reel

Motor

Speed

Adjustment

in

Play

Mode

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

02

cee

eee

ee

ee

eee

eee

2.

8.

Tape

Speed

Adjustment...

occ:

igseee

eos

sa

tevin,

bee

es

ee

ee

eed

eS

So

eee

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a

Se

eae

ees

2.

9.

Ti

DriCAtION

5.5.5

56

joc

oF

ES

AD

Ae

aS

Bete

SS

ae

ese

FH

Sha

E

ee

as

PIS

Be

AE

Se

eS

ae

3,

Parts

Location

for

Electrical

Adjustment...

........0..

0.

eee

ee ee

eee

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ee

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4.

Electrical

Adjustments

and

Measurements

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

00.

cee

ee

eee

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ete

4, 1.

Adjustment

and

Measurement

Instructions

.........

0...

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tenes

4,

2.

Dolby

NR:

Cireuit:

Cheeks

2:

sacks

ee

See

Pe

ee

haw

A

0

SE

Be

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ENS

A

EP

eee

ORE

5.

Mechanism

Ass’y

and

Parts

List...

0...

cc

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ie

Synthesis.

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wrap

hcg

OF

boro

Wee

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ah

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a

5.

2,

Synthesis

Mechanism

Ass’y

(AO1)

2.1...

ee

eee

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5.

3.

Mechanism

Ass’y

(BOL)

2.0...

ce

ce

eee

ee

ee

ee

ee

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tener

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tee

enteane

6.

Mounting

Diagrams

and

Parts

List

..

1...

1.

ee

ee

eee

ee

te

ee

ee ee

eet

teens

6.

1.

Power:

Switch’

PC.

Bi

Ase

yi

o's

eas

ooo

Bish

oe

wha

Ss

bela

SG Ok GN

Bea

OR

ge

wee

Ge

Hed

aye

6.

2.

Pin-Jack-P:C.B.

Assy

soso

cates

bio

eee

samba

intsvee

tac

a

Sa

waa!

Bre

le By

BOS

BS ah

os

te

a,

tee

habe

OLS

aE

BEE

Bate

eas

6.

3.

Volume

P:C.B..Ass’y

$6.05

05

3d

eat

lacd:

he

oe

ls

a

hl

AG

ES

Sees

wee

ed

A

a

SS

6,

4.

Dolby

NR:

Switch:P:C.B:

Ass’V

cc.

cia

ie

earache

6b.

0S.

Beeps

eee

els

Guales

Bel

eel!

Boa

aliens

6.

5.

Indicator:

P.C.B:.

Assy?

5606.3.

S

we

clos

we

SSAA

Bele

Biba

ee

ae

a

Oe

ae

aa

ea

Se

a

6.

6.

Timer:

Switch

P:C.By

Ass’y

iri)

oe

ddd

dese

ws

baste

asco

Biel

es

bein

de

Se

dee

pS

oS

ae

Gabe

aE

6.

7.

Control

Switch.

P:C-B;

Ass’y.

..e.6.5

3

felons

be

bse

ween

a

Abe

We

a

BG

Geelao

eg

a

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6.

8.

Shut-off

P:C.B.

Ass’¥

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646

26508

6

ee

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eye

Re

a

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OE

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6.

9.

Counter:

PC:

Bi

Ass

yom

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hha

8

Eee

Brae

ele

Bl

wlaes

Sites

ces

Saha

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ac

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pee

oliseys

6.

10.

Main’

P.C.B,

AS67996

ati

&

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coed

28

aye

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pte

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wee

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sep:

OR

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LEASE

Basel

arenas

bua

BRASS.

7.

‘Schematic:

Diagrams:

2/6

068-6

0e

Fee

a

Serle

Sw

Biss

wa

an

UE

a

BAR

alee

et

ae hk

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atlg

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ea

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7

1.

Attention

to

Servicemen..

2...

1.

ce

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7

2.

IC

Block:

Diagrams

i...

b.6

claus

alae)

8

Oe

fe

ee

SE

bates

ly

EP

OG

RPE

ob

ool

nal

ea

ee

ein

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7.

3.

Schematic:

Diagrams

0-006

05

case

Sere

ee

ae

6

GE

a

ele

he ee

LE

hE

a

Mate

Ba

Dre

Bharti

eee

a4

8.

Timing

Chart

and

Eq.

Amp.

Frequency

Response

..........

2.2...

eee

eee

ee ee

eee

ee

tee

eee

ee

QO.»

“Wiring

Diagrams

i)

a

2s

Gis

cd

ate

ese

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asa

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b

Teed

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Ores

10...

“Block:

Diagrams...

6

3:5

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5

eh

Soh aig

o

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Dodie

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aes

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leh

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AL:

“Specifications

5.2

foes

&

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s

Sette

care

say

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0

MORES:

oa

Ree

ALN

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salah

Ble:

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eg

ee

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ao

We

Mane

eS

Bisa

1,

GENERAL

1.1.

Voltage

Selector

Voltage

selector

is

installed

on

the

rear

panel

for

Other

version

of

the

Nakamichi

BX-2.

This

voltage

selector

can

select

either

120

V

or

220-240

V

at

customer’s

disposal.

1.2,

Parts

List

for

Carton

and

Packing

Part

No.

Description

Q’ty

OF

03673C

Carton

1

OFO3674A

Packing

2

1.3.

Serial

Number

The

BX-2

has

two

versions,

Silver

and

Black.

In

the

service

manual,

serial

numbers

of

these

versions

are

identified

as

follows:

Silver

version:

A316xxxxx

Black

version:

A317xxxxx

However,

the

actual

serial

number

on

the

serial

number

plate

of

the

BX-2

is

indicated

as

A316.7xxxxx.

The

serial

number

begins

with

A316.701001.

2.

MECHANICAL

ADJUSTMENTS

2.1.

Tape

Guide

Height

Check

for

Record/Playback

Head

and

Erase

Head

.

With

use

of

an

M-300

produced

by

Information

Terminals,

tape

guide

height

check

for

the

Record/Playback

and

Erase

Heads

shall

be

made,

wherein

a

small

block

shall

be

pushed

straight

down

to

the

base

while

in

use

of

the

M-300,

Refer

to

Fig,

2.1.

(1)

Record/Playback

Head

Tape

Guide

Height

(a)

Load

the

base

of

the

M-300

carefully,

then

set

the

cassette

deck

in

Play

mode.

(b)

Place

the

small

block

of

the

M-300

on

the

base.

(ce)

Slide

the

small

block

against

the

tape

guide

of

the

Record/

Playback

Head,

and

check

to

insure

that

the

block

is

ac-

cepted

by

the

tape

guide.

(ad)

If

not,

loosen

the

screw

and

insert

a

shim

(either

30

um

(0C80048A),

60

um

(0C80038A),

or

100

hm

(0C80039A))

to

raise

the

Record/Playback

Head,

then

tighten

and

apply

a

quantity

of

lock

tight

paint

to

the

screw.

(2)

Erase

Head Tape

Guide

Height

(a)

Load

the

base

of

the

M-300

carefully,

then

set

the

cassette

deck

in

Play

mode.

(b)

Place

the

small

block

of

the

M-300

on

the

base.

(ce)

Slide

the

small

block

against

the

tape

guide

of

the

Erase

Head,

and

check

whether

the

block

is

accepted

by

the

tape

guide.

2.2.

Head

Base

Stroke

Check

Refer

to

Fig,

2.2.

(1)

Load

the

base

of

the

M-300

carefully,

then

push

the

base

toward

the

Record/Playback

Head

to

eliminate

the

clearance

between

the

reference

pin

and

the

base.

(2)

Set

the

cassette

deck

in

Play

mode,

(3)

Place

the

small

block

of

the

M-300

on

the

base,

(4)

Contact

the

small

block

with

the

Record/Playback

Head

sur-

face

and

the

Erase

Head

surface,

and

check

whether

the

end

of

the

small

block

is

located

within

the

specified

tolerance

as

shown

in

the

figure.

2.3.

Record/Playback

Azimuth

Alignment

and

Height

Check

Refer

to

Fig.

2.1.

(1)

Connect

a

VTVM

to

the

Output

Jacks,

(2)

Load

a

15

kHz

Azimuth

Tape

(DA09004A),

then

set

the

cassette

deck

in

Play

mode.

(3)

Turn

the

Azimuth

Alignment

Screw

until

the

outputs

of

both

channels

become

maximum.

(4)

Load

al

kHz

Track

Alignment

Tape

(DA09007A),

then

set

the

cassette

deck

in

Play

mode.

(5)

Check

to

insure

that

the

readings

of

both

channels

on

the

VTVM

are

below

—25

dB.

If

not,

replacement

of

the

Record/Playback

Head

will

be

required,

<

(6)

Apply

a

quantity

of

lock

tight

paint

to

the

Azimuth

Align-

ment

Screw,

2.4,

Pressure

Adjustment

of

Pressure

Roller

Refer

to

Fig,

2.3.

(1)

In

Play

mode,

measure

the

torque

of

the

Pressure

Roller

and

check

whether

the

torque

is

in

a

range

of

320

+50

g-cm.

(2)

If

torque

is

out

of

the

range,

correct

it

by

changing

the

instal-

lation

point

of

the

Pressure

Roller

Spring.

2.5.

Tape

Travelling

Check

Load

the

Tape

Travelling

Cassette

(DA09027A),

then

set

the

cassette

deck

in

Play

mode

and

check

the

following:

(1)

After

more

than

2

seconds,

the

fluctuation

of

the

tape

trav-

elling

on

the

Record/Play

back

Head

is

small,

(2)

Tape

isin

contact

with

the

head

sufficiently.

(3)

Tape

waving

is

small

on

the

heads

and

pressure

roller.

2.6.

Eject

Damper

Adjustment

Refer

to

Fig.

2.4.

Load

a

cassette

tape,

and

with

opening

the

Cassette

Case

by

pressing

the

Eject

button

and

closing

it

by

hand,

adjust

the

speed

of

damper

movement

by

the

Adjustment

Screw.

CCW:

Damper

moves

fast.

CW:

Damper

moves

slowly.

Fig,

2.3

Decrease

NH

Increase

Capstan

Motor

Fig,

2.4

2.7,

Reel

Motor

Speed

Adjustment

in

Play

Mode

(1)

Connect

a

DC

Voltmeter

across

the

Reel

Motor

terminals.

(2)

Load

a

C-60

cassette

tape,

then

set

the

cassette

deck

in

Play

mode,

(3)

Adjust

VR601

on

the

Main

P.C.B.

Ass’y

to

obtain

approx.

3

V

on

the

DC

Voltmeter

at

the

beginning

of

the

tape.

(4)

Load

a

Torque

Meter

TW-2111

(Made

by

Sony)

and

check

that

the

torque

is

50

+10

g-cm.

2.8.

Tape

Speed

Adjustment

Refer

to

Fig.

2.5,

(1)

Connect

a

frequency

counter

to

the

Output

Jacks,

(2)

Load

a

3

kHz

Speed

and

Wow/Flutter

Tape

(DA09006B)

and

Play

it

back.

(3)

Adjust

the

Tape

Speed

Adjustment

Volume

incorporated

in

the

Capstan

Motor

to

obtain

3,000

Hz

on

the

frequency

counter,

CCW:

Motor

drives

slowly.

CW:

Motor

drives

fast.

2.9.

Lubrication

The

tape

transport

is

of

a

lubrication-free

type

mechanism.

When

the

following

parts

are

replaced,

apply

the

specified

lubricant.

(1)

Molykote®)

Grease

(X5-6020)

Cam

Motor

Pulley

Thrust

portion

on

the

Capstan

Shaft

(2)

FLOIL

GB-TS-1

Washer

between

Reel

Hub

Ass’y

and

Back

Tension

Spring

(3)

Diamond

Oil

(EP56)

Reel

Hub

Shaft

(4)

Anderol

456

Capstan

Shaft

Note:

We

suggest

that

you

use

the

above

specified

lubricant

or

3.

PARTS

LOCATION

FOR

ELECTRICAL

ADJUSTMENT

T301

@

|

Bias

osc.

Frequency

@

Lvei0e

Bios

Cut

@

fvreve

VR6OI

Reel

Motor

Speed

(Play)

©TPior

TP201

©

MPX

Filter

L205

Fig.

3

Playbock

Level

Meter

Level

G@

tveeo1

equivalent

type.

The

company

dealing

in

the

above

lubricant

is

as

follows:

(a)

Molykote()

Grease

(X5-6020)

Dowcorning

Co.,

Ltd.,

1-15-1

Nishishinbashi,

Minato-

ku,

Tokyo,

Japan

(b)

FLOIL

GB-TS-1

Kanto

Chemicals

Co.,

Ltd.,

2-7

Kanda

Sakuma-cho,

Chiyoda-ku,

Tokyo,

Japan

(c)

Diamond

Oil

(EP-56)

Mitsubishi

Oil

Co.,

Ltd.,

1-2-4

Toranomon,

Minato-ku,

Tokyo,

Japan

(d)

Anderol

456

Toyo

Kokusai

Oil

Co.,

Ltd.,

3-3-5

Hatchobori,

Chuo-

ku,

Tokyo,

Japan

‘6

Increase

Domper

Adjustment

Screw

Bios

Trop

Peaking

—

(Record)

L203(@)

-200(@)

©

TP203

Rec.

Cal.

VR204

VR203

VR202

‘ll

VRIO5

VR207

VR206

VR205

02

N

Pad

zx

SX

m

~

7)

x

VRIO4

VRIO3

VRI

sce

EX

LIO5

4.

ELECTRICAL

ADJUSTMENTS

AND

MEASUREMENTS

Note:

Electrical

adjustment

should

be

performed

after

mechanical

adjustment

is

completed.

4,1,

Adjustment

and

Measurement

Instructions

SIGNAL

OUTPUT

EEN

SOURCE

CONNECTION

ADJUST-

MENT

REMARKS

3

kHz

Speed

and

Frequency

Tape

Speed

|

wow/Flutter

|

Counter

to

Adjustment

|

Tape

Output

Jacks

(DA09006B)

Playback

Eq.

SW—

70

us

Tape

Speed

Adjustment

Volume

Adjust

the

volume

incorporated

in

the

capstan

motor

to

obtain

3

kHz

+0.5%

on

the

frequency

counter,

VTVM

to

TP101,

TP201

on

Main

P.C.B.

400

Hz

to

Input

Jacks

Meter

Level

Calibration

Record,

Pause

Main

P.C.B.

VR108,VR208

1.

Feed

in

400

Hz,

then

adjust

the

Input

Level

control

to

obtain

350

mV

—0.9

dB

on

the

VTVM.

2.

Adjust

VR108

(VR208)

so

that

the

0

dB

segment

of

the

level

meter

starts

iluminat-

ing.

3.

Adjust

the

Input

Level

control

to

obtain

350

mV

on

the

VTVM,

then

decrease

the

generator

output

level

by

20

dB.

4,

Check

to

insure

that

the

segment

for

—20

dB

illuminates,

MPX

Filter

|

19

¥Hz

seo

VTVM

to

Record,

Pause

MPX

SW

—

OFF/ON

Main

P.C.B.

L105,L205

1,

Adjust

the

Input

Level

control

to

obtain

0

dB

(500

mV)

on

the

VTVM.

2.

Set

the

MPX

Filter

switch

to

ON,

then

adjust

L105

(L205)

to

obtain

minimum

reading

on

the

VTVM

(minimum

reading

will

be

less

than

—30

dB).

Playback

Eq.

SW

—

70

us

MPX

SW

—

OFF

Dolby

NR

SW

—

OFF

Record/Pliay

back

Head

Azimuth

Alignment

Screw

Adjust

the

Record/Playback

Head

Azimuth

Alignment

Screw

to

obtain

maximum

readings

of

both

channels

on

the

VT

VM.

'

Hz

to

Adjustment

Input

Jacks

Output

Jacks

Record/

4

Playback

15

kHz

4

|

Head

Azimuth

Tape

|

Gorout

Jacks

Azimuth

(DA09004A)

Alignment

Playback

400

Hz

Level

VTVM

to

5

Level

Tape

TP101,

TP201

Calibration

|

(DA09005A)

on

Main

P.C.B.

a

aa

Same

as

above

Main

P.C.B.

VR101,VR201

Adjust

VR101

(VR201)

to

obtain

350

mV

on

the

VTVM.

————_—__--}

400

Hz

Level

Tape

(DAO09005A)

10

kHz

PB

Frequency

Response

Tape

(DA09003A)

15

kHz

PB

Frequency

Response

Tape

(DA09002A)

20

kHz

PB

Frequency

Response

Tape

(DA09001A)

Playback

Frequency

6

|

Response

Adjustment

VTVM

to

Output

Jacks

Playback

Eq.

SW

—

70

ys

;

Dolby

NR

SW

—

OFF

MPX

SW

—

OFF

1,

Load

a

400

Hz

level

tape

and

play

it

back.

2.

Load

10

kHz,

15

kHz

and

20

kHz

PB

fre-

quency

response

tapes

and

adjust

the

record/playback

head

azimuth

to

obtain

maximum

levels

on

the

VTVM

with

each

tape.

3.

Read

the

maximum

levels

with

each

tape

and

check

to

insure

that

the

levels

against

the

400

Hz

level

tape

are

within

the

follow-

ing

ranges,

10

kHz

(—20

dB)

—2

dB

to

+2

dB

15

kHz

(—20

dB)

—2

dB

to+3

4B

20

kHz

(—20

dB)

—2

dB

to

+4

dB

Check

to

insure

that

the

difference

in

level

between

10

kHz

(20

dB)

and

20

kHz

(—20

dB)

is

less

than

2

dB.

Note:

If

the

playback

level

of

20

kHz

PB

frequency

response

tape

is

insuf-

ficient,

add

C107

(C207)

150

pF

in

parallel

with

C108

(C208)

1200

pF

in

the

playback

eq.

amp.

circuit

of

the

Main

P.C.B.

Ass’y.

4,

Conduct

step

4

“Record/Playback

Head

Azimuth

Alignment’’.

Frequency

Bias

Counter

to

Oscillation

TP102

7

Frequency

on

Main

P.C.B.

and

Erase

and

Current

VTVM

across

Adjustment

the

additional

0.1

Q

resistor

Record,

Pause

Tape

SW

—

ZX

Eq.

SW

—

70

us

Dolby

NR

SW

—

OFF

MPX

SW

—

OFF

Main

P.C.B.

T301

R318,R350

i,

Adjust

T301

to

obtain

105

kHz

on

the

fre-

quency

counter.

2.

Connect

an

additional

0.1

Q

resistor

in

series

to

the

Erase

Head,

then

connect

a

VTVM

across

it.

3.

Check

the

erase

current

by

the

VT'VM,

Erase

current

will

be

in

a

range

of

145

mA

to

185

mA

(typically

approx.

165

mA).

If

erase

current

is

not

sufficient,

increase

it

by

shorting

R318

or

R350.

4,

After

completion

of

the

erase

curent

ad-

justment,

re-check

the

bias

oscillatiora

fre-

quency,

Remove

the

additional

0.1

2

resistor,

5.

|

1.

|

ceapure.

[ol

EBe

VTVM

to

re

8

;

(—20

dB)

to

TP102,

TP202

ain

P.C.B.

2s

Equalizer

Same

as

above

L102,L202

3

Short

both

Bias

Stop

test

pins

with

a

clip

to

stop

the

bias

oscillation.

Adjust

L102

(L202)

to

obtain

peak

read-

ing

at

21

kHz

on

the

VTVM.

.

Remove

the

clip

from

the

test

pins.

Bias

Trap

9

|

Adjustment

|

Remove

LE

to

(Record

input

signals

TP103,

TP203

Amp.)

Adjustment

|

mput

Jacks

al

on

Main

P.C.B.

=

on

Main

P.C.B.

Same

as

above

Main

P.C.B.

L103,L203

Adjust

L103

(L203)

to

obtain

maximum

read-

ing

on

the

VTVM.

Record

Level

Calibration

and

Recording

Bias

Current

Adjustment

SIGNAL

SOURCE

OUTPUT

CONNECTION

400

Hz

(0

dB),

400

Hz

(—20

GB),

10

kHz

(—20

dB)

and

17

kHz

(—20

dB)

to

Input

Jacks

VTVM

to

TP101,

TP201

and

TP102,

TP202

on

Main

P.C.B.

and

VTVM

and

Distortion

Meter

to

Output

Jacks

ADJUST-

MENT

REMARKS

Main

P.C.B.

(Level)

ZX:

Record

and

Playback

Mee

102,VR202

Tape

SW

—

ZX/SX/EX

.

Eq.

SW

—

70

us

VE

LOd

RAS

(ZX/SX)

-

120

us

(EX)

VR104,VR204

Dolby

NR

SW

—

C-Type/B-Type/

OFF

(Bias)

ZX:

VR105,VR205

SX:

MPX

SW

—

OFF

VR106,VR206

EX:

VR107,VR207

Adjustment

should

be

made

in

the

order

of

ZX,

SX

and

EX.

1

2

3.

4,

Feed

in

400

Hz,

then

adjust

the

Input

Level

.

Set

the

Doiby

NR

switch

to

C-Type.

.

Connect

a

VTVM

to

TP101

(TP201)

on

the

Main

P.C.B.

Ass’y.

Set

the

BX-2

in

Record/Pause

mode.

control

to

obtain

350

mV

(0

dB)

on

the

VTVM.

.

Load

a

reference

ZX

tape

(DA090374A),

reference

SX

tape

(DA09025A)

and

refer-

ence

EXII

tape

(DAO9066A).

.

Adjust

Record

Cal.

VR102

(VR202)

for

ZX,

VR103

(VR203)

for

SX

and

VR104

(VR204)

for

EXIT

to

center

positions,

.

Connect

the

VTVM

to

TP102

(TP202)

on

the

Main

P.C.B.

Ass’y.

Adjust

Bias

VR105

(VR205)

for

ZX,

VR106

(VR206)

for

SX

and

VR107

(VR207)

for

EXII

to

obtain

the

following

bias

current

in

Record/Pause

mode

(the

VTVM

is

connected

across

a

10-

ohm

resistor).

ZX:

approx.1mA

SX:

approx.

0.5

mA

EX:

approx.

0.3

mA

.

Connect

the

VTVM

to

the

Output

Jacks,

.

Feed

in

400

Hz

(—20

dB)

and

17

kHz

(—20

Saaiel

then

record,

rewind

and

play

them

back,

Adjust

Bias

VR105

(VR205)

for

ZX,

VR106

(VR206)

for

SX

and

VR107

(VR207)

for

EXII

to

obtain

the

same

play-

back

levels

at

400

Hz

(—20

dB)

and

17

kHz

(—20

dB)

on

the

VTVM.

.

Feed

in

400

Hz

(0

dB),

then

record,

rewind

and

play

it

back,

Adjust

Record

Cal.

VR102

(VR202)

for

ZX,

VR103

(VR203)

for

SX

and

VR104

(VR204)

for

EXII

to

obtain

0

dB

on

the

VTVM.

Repeat

above

9

and

10

two

or

three

times

to

obtain

optimum

performance,

.

Set the

Dolby

NR

switch

to

OFF.

.

Feed

in

400

Hz

(—20

dB),

10

kHz

(—20

dB)

and

17

kHz

(—20

dB),

then

record,

rewind

and

play

them

back.

Check

to

insure

that

the

playback

levels

are

within

—20

dB

+3

dB

against

the

levels

in

Dolby

NR

C-Type.

Set

the

Dolby

NR

switch

to

B-Type,

.

Feed

in

10

kHz

(—20

dB)

and

17

kHz

(—20

dB),

then

record,

rewind

and

play

them

back.

Check

to

insure

that

the

levels

are

within

—20

dB

+2

dB

against

the

levels

in

Dolby

NR

OFF.

.

Check

to

insure

whether

the

total

harmonic

distortion

is

less

than

1.0%

for

ZX

and

EXII

tapes

and

1.2%

for

SX

tape.

.

If

above

is

not

sufficient,

repeat

9

to

16

till

satisfactory

results

are

obtained.

Overall

Frequency

Response

Adjustment

400

Hz

(0

dB)

and

20

Hz

to

17

kHz

(—20

dB)

to

Input

Jacks

1

kHz

to

Input

Jacks

VTVM

to

Output

Jacks

©

1

kHz

Band

Pass

Filter

and

VTVM

to

Output

Jacks

Record

and

Playback

Tape

SW

—

ZX/SX/EX

Eq.

SW

—

70

us

(ZX/SX)

120

us

(EX)

Dolby

NR

SW

—

OFF

MPX

SW

—

OFF

Main

P.C.B.

L102,L202

Record

and

Playback

Tape

SW

—

ZX

Eq.

SW

—70us

Dolby

NR

SW

—

OFF

MPX

SW

—

OFF

.

Set

the

BX-2

in

Record/Pause

mode,

.

Feed

in

400

Hz,

then

set

the

Input

Level

control

to

obtain

0

dB

(500

mV)

on

the

VTVM.

3.

Decrease

the

generator

output

control

by

20

dB

.

Feed

in

20

Hz

to

17

kHz

(—20

dB)

and

.

If

above

record,

rewind

and

play

them

back,

then

check

to

insure

whether

the

output

levels

are

within

—20

dB

+4

dB.

is

not

sufficient,

adjust

L102

(L202)

to

obtain

approx.

—20

dB

on

the

VTVM,

then

conduct

step

10

“‘Record

Level

Calibration

and

Recording

Bias

Current

Adjustment”’,

.

If

above

is

not

sufficient,

precise

re-adjust-

ment

of

step

6

‘‘Playback

Frequency

Re-

sponse’’,

replacement

of

Record/Playback

Head

or

check

on

item

2.6

“Tape

Travelling

Check”

will

be

required,

.

Erase

the

tape

with

bulk

eraser,

.

Adjust

the

Input

Level

control

to

obtain

0

dB

on

the

VTVM,

and

record

the

signals

on

the

reference

ZX

tape

(DA09037A).

3.

Turn

the

cassette

tape

the

other

way

round

and

play

it

back.

.

Measure

the

difference

between

2

and

3,

SIGNAL

SOURCE

OUTPUT

CONNECTION

MODE

REMARKS

Channel

Separation

Measure-

ment

1kHz

to

Input

Jacks

1

kHz

Band

Pass

Filter

and

VTVM

to

Output

Jacks

Record

and

Playback

Tape

SW

—

ZX

Eq.

SW

—

70

us

Dolby

NR

SW

—

OFF

MPX

SW

—

OFF

.

Erase

the

tape

with

bulk

eraser.

.

Adjust

the

Input

Level

control

to

obtain

0

dB

on

the

VTVM,

and

set

the

Balance

control

to

the

extreme

left

(right).

.

Record,

rewind

and

play

it

back,

then

mea-

sure

the

R

ch

(L

ch)

level.

100

Hz

to

Input

Jacks

100

Hz

Band

Pass

Filter

and

VTVM

to

Output

Jacks

Same

as

above

.

Erase

the

tape

with

bulk

eraser.

.

Adjust

the

Input

Level

contro!

to

obtain

0

dB

on

the

VTVM,

and

record

the

signals

on

the

reference

ZX

tape

(DA09037A),

3.

Rewind

the

tape,

set

the

Input

Level

control

to

minimum,

and

then

record

again.

.

Rewind

the

tape,

play

it

back,

and

then

measure

the

difference

between

2

and

3.

Signal

to

Noise

Ratio

Measure-

ment

400

Hz

to

Input

Jacks

IHF-A

Curve,

Filter,

VTVM

and

Distortion

Meter

to

Output

Jacks

Record

and

Playback

Tape

SW

—

ZX

Eq.

SW

—

70

us

Dolby

NR

SW

—

B-Type/C-Type

MPX

SW

—

OFF

.

Set

the

Dolby

NR

switch

to

B-Type/C-Type.

.

Feed

in

400

Hz,

then

record,

rewind

and

play

it

back,

.

Adjust

the

Input

Level

control

to

obtain

3%

total

harmonic

distortion

in

Playback

mode.

.

Set

the

Input

Level

control

to

minimum

then

record

again.

.

After

rewound,

play

back

and

check

the

2

3

4

5

L

output

level

difference

between

3

and

4.

Note:

The

filter

of

IHF-A

curve

shall

be

used

in

the

measurements.

Total

Harmonic

Distortion

Measure-

ment

VTVM

and

Distortion

Meter

to

Output

Jacks

400

Hz

to

Input

Jacks

Record

and

Playback

Tape

SW

—

ZX/SX/EX

Eq.

SW

—

70

us

Dolby

NR

SW

—

OFF

MPX

SW

—

OFF

.

Adjust

the

Input

Level

contro]

to

obtain

0

dB

on

the

VTVM.

.

Record,

rewind

and

play

it

back,

.

Read

the

distortion

meter

and

check

to

insure

that

the

distortion

is

as

follows:

1.0%

or

less

1.2%

or

less

1.0%

or

less

4.2

3

kHz

Speed

and

Wow/

Flutter

Tape

(DA09006B)

Wow/Flutter

Meter

to

Output

Jacks

Playback

.

Dolby

NR

Circuit

Check

Dolby

NR

circuit

incorporates

Dolby

NR

ICs

which

have

no

adjustment

point.

Perform

the

following

checks

and

make

sure

that

the

IC

operates

accurately,

ie.,

frequency

response

through

IC

is

accurate,

4.2

qd)

(a)

(b)

(c)

(2)

(a)

(b)

(ce)

(a)

.1.

Dolby

NR

B-Type

Circuit

Check

Playback

Dolby

NR

Circuit

Signal

Source:

1.4

kHz

to

negative

side

of

C134

(C234)

on

Main

P.C.B,

(Positive

side

is

connected

to

IC101-9

(IC201-9)).

VTVM

to

test

point

TP101

(TP201)

on

Main

P.C.B.

Stop

Dolby

NR

SW

—

ON

(B-Type)/OFF

Connect

a

VITVM

to

TP101

(TP201)

on

the

Main

P.C.B.

Ass’y,

Set

the

Dolby

NR

switch

to

B-Type.

Feed

in

1.4

kHz

and

adjust

the

generator

output

control

to

obtain

35

mV

on

the

VTVM.

Set

the

Dolby

NR

switch

to

OFF.

Check

to

insure

that

the

reading

is

+3.2

dB

+1.5

dB

on

the

VTVM.

Output

Connection:

Mode:

Record

Dolby

NR

Circuit

Signal

Source:

1,4

kHz

to

Input

Jacks

Output

Connection:

VTVM

to

test

point

TP101

(TP201)

and

negative

side

of

C140

(C240)

on

the

Main

P.C.B.

Record/Pause

Dolby

NR

SW

—

ON

(B-Type)/OFF

Connect

a

VTVM

to

TP101

(TP201)

on

the

Main

P.C.B.

Ass’y,

Feed

in

1.4

kHz

and

adjust

the

Input

level

control

to

obtain

35

mV/11.1

mV

on

the

VTVM.

Remove

the

VITVM

from

TP101

(TP201)

and

reconnect

it

to

negative

side

of

C140

(C240).

Check

to

insure

that

the

reading

at

C140

(C240)

corresponds

to

the

following

with

Dolby

NR

switch

OFF

and

B-Type.

Mode:

Input

Level

Level

at

negative

side

of

C140

(C240)

at

TP101

(TP201)

|

Dolby

NR

OFF

Dolby

NR

B-Type

35

mV

0

dB

+3.2

dB

+1.5

dB

111

mV

0

dB

+8.2

dB

+1.5

dB

Eq.

SW

—

70

us

Play

back

and

read

the

wow/flutter

meter.

4.2.2,

Dolby

NR

C-Type

Circuit

Check

q)

(a)

(b)

(c)

(2)

(a)

(b)

(ec)

(d)

Playback

Dolby

NR

Circuit

Signal

Source:

1.4

kHz

to

negative

side

of

C134

(C234)

on

Main

P.C.B.

(Positive

side

is

connected

to

1C101-9

(IC201-9)).

VTVM

to

test

point

TP101

(TP201)

on

Main

P.C.B.

Stop

Dolby

NR

SW

—

ON

(C-Type)/OFT

Connect

a

VTVM

to

TP101

(TP201)

on

the

Main

P.C.B.

Ass’y.

Set

the

Dolby

NR

switch

to

C-Type.

Feed

in

1.4

kHz

and

adjust

the

generator

output

control

to

obtain

35

mV

on

the

VTVM.

Set

the

Dolby

NR

switch

to

OFF,

Check

to

insure

that

the

reading

is

+6.5

dB

+1.5

dB

on

the

VTVM.

Output

Connection:

Mode:

Record

Dolby

NR

Circuit

Signal

Source:

1.4

kHz

to

Input

Jacks

Output

Connection:

VTVM

to

test

point

TP101

(TP2)3)

and

negative

side

of

C140

(C240)on

the

Main

P.C.B.

Record/Pause

Dolby

NR

SW

—

ON

(C-Type)/OFF

Connect

a

VTVM

to

TP101

(TP201)

on

the

Main

P.C,B.

Ass’y.

Feed

in

1.4

kHz

and

adjust

the

Input

level

control

to

obiain

35

mV/11.1

mV

on

the

VTVM.

Remove

the

VTVM

from

TP101

(TP201)

and

reconnect

ii

to

negative

side

of

C140

(C240).

Check

to

insure

that

the

reading

at

C140

(C240)

correspm

ds

to

the

following

with

Dolby

NR

switch

OFF

and

C-Type.

Mode:

Input

Level

Level

at

negative

side

of

C140

(C240)

at

TP101

(TP201)

|

Dolby

NR

OFF

|

Dolby

NR

C-Type)

35

mV

0

dB

+6.5

dB

+1.5

dB

11.1

mV

0

dB

+11,4

dB

+1.5

dB

MECHANISM

ASS’Y

AND

PARTS

LIST

5.

5.1,

Synthesis

Fig.

5.1

Description

ow

Synthesis

(UK)

Synthesis

(U.S.A.

&

Canada)

Synthesis

(Japan)

Synthesis

(Others)

Synthesis

(Australia)

Synthesis

(220V

Class

2)

Serial

No.:

A31701001

-

(Black)

Le

eee.

eee

ee

Synthesis

(UK)

HA04348A

Synthesis

(U.S.A.

&

Canada)

HA04349A

Synthesis

(Japan)

HA04350A

Synthesis

(Others)

HA04351A

Synthesis

(Australia)

HA04352A

Synthesis

(220V

Class

2)

HA04353A

Serial

No.:

A31601001

-

(Silver)

Schematic

HA04342A

HA04343A

HA04344A

HA04345A

HA04346A

HA04347A

HA04362A

|

Cassette

Case

Cover

Ass’y

HA04363A

|

Cassette

Case

Cover

Ass’y

0H04133B

|}

Front

Panel

0H04134B

|

Front

Panel

0H04107A

|

Slide

Switch

Knob

0H04108A

|

Slide

Switch

Knob

0H04155B

0HO4156B

|

Top

Cover

Top

Cover

Synthesis

Mechanism

Ass’y

(UK)

Synthesis

Mechanism

Ass’y

(U.S.A.

&

Canada)

Synthesis

Mechanism

Ass’y

JA03963B

|

Synthesis

Mechanism

Ass’y

(UK)

JA03964B

|

Synthesis

Mechanism

Ass’y

(U.S.A.

&

Canada)

JA03965B

|

Synthesis

Mechanism

Ass’y

JA03957B

JA03958B

JA03959B

(Japan)

(Japan)

JAO3960B

|

Synthesis

Mechanism

Ass’y

JA03966B

|

Synthesis

Mechanism

Ass’y

(Others)

(Others)

JA03961B

|

Synthesis

Mechanism

Ass’y

JA03967B

|

Synthesis

Mechanism

Ass’y

(Australia)

(Australia)

JA03968B

|

Synthesis

Mechanism

Ass’y

JA03962B

(220V

Class

2)

Synthesis

Mechanism

Ass’y

(220V

Class

2)

0J04605B

|

Bottom

Cover

0J04605B

|

Bottom

Cover

0J03564A

|

Leg

T-H

0J03564A

|

Leg

T-H

0M04377A

|

Caution

Label

0M04377A

|

Caution

Label

0M03551B

|

Pass

Label

B

0M03551B

|

Pass

Label

B

0J04630A

|

Rubber

0J04630A

|

Rubber

0J04629A

0J04628A

0E03054A

0E03032A

Top

Cover

Cushion

B

Top

Cover

Cushion

A

BT

3x8

®Countersunk

BT

4x8

©

Pan

Washer

Faced

(Black

Chromate)

BT

3x6

©

Binding

BT

3x10

©

Binding

Voltage

Label

220V

(220V

Class

2)

Voltage

Label

240V

(UK

&

Australia)

Cord

Label

(UK)

0J04629A

0J04628A

0E03054A

0E03033A

OEO0857A

OE00865A

OM03796A

0M03797A

Top

Cover

Cushion

B

Top

Cover

Cushion

A

BT

3x8

©

Countersunk

BT

4x8

®

Pan

Washer

Faced

(Nickel)

BT

3x6

9

Binding

BT

3x10

©

Binding

Voltage

Label

220V

(220V

Class

2)

Voltage

Label

240V

(UK

&

Australia)

Cord

Label

(UK)

OEO0857A

OEOO865A

OM03796A

OM03797A

0M03844B

0M03844B

Bee

ee

eS

HOO

PRN

NEPREPN

RE

BP BP HF Be

eee

bee

Bee

eEeE

FP

HOOD

BPN

NE

PNP

HB BE

Be

oF

BRE

0M04397A

|

Serial

Number

Plate

0M04397A

|

Serial

Number

Plate

0M04113A

|

LA

Label

(U.S.A,

&

Canada)

0M04113A

|

LA

Label

(U.S.A.

&

Canada)

0M04293A

|

Voltage

Seal

(Others)

0M04293A

|

Voltage

Seal

(Others)

0M04185A

|

FSZ

Mark

Label

(220V

Class

2)

0M04185A

|

FSZ

Mark

Label

(220V

Class

2)

5.2.

Synthesis

Mechanism

Ass’y

(A01)

U.S.A.,Canada,Japan

&

Others

53

55

UK,

Australia

&

220VClass2

JA03957B

JA03958B

Synthesis

Mechanism

Ass’y

(UK)

Synthesis

Mechanism

Ass’y

(U.S.A.

&

Canada)

Synthesis

Mechanism

Ass’y

BA04804A

BA04802A

‘BA04905A

JA03959B

(Japan)

BAO04800A

JA038960B

|

Synthesis

Mechanism

Ass’y

(Others)

0B06378A

JA03961B

|

Synthesis

Mechanism

Ass’y

BAO4801A

(Australia)

BA04803A

JA03962B

|

Synthesis

Mechanism

Ass*y

(220V

Class

2)

Serial

No.:

A31601001

-

(Silver)

0H08511A

0J04611A

CA08399A

HA04390A

0J04604B

0J04076A

BA04823A

0H04137A

0H04129A

0J04607A

0H04125A

0J04608A

0H04112A

0H04110B

0H04139B

0H04143A

0H04141B

0HO4116A

0H04118A

0H04120A

0H04123B

0H04121C

0J04610A

0J04606A

0H04105A

0H04103B

0H04113A

OHO4157A

0H04618A

BA04805A

Front

Chassis

Eject

Button

Eject

Spring

Power

Switch

Button

Power

Switch

Spring

Meter

Cover

Meter

Scale

Reset

Button

Control

Button

A

Record

Mute

Button

Control

Button

B

Control

Button

C

Lens

Dolby

NR

Switch

Button

Eq.

Button

Ea.

Switch

Spring

Button

Joint

Master

Volume

Knob

Balance

Volume

Knob

Volume

Plate

Volkume

Cover

Volume

Shield

Plate

Volume

P.C.B.

Ass’y

BA04824A

BA04825A

0J04603D

BA04906A

BA04861A

OJ04581A

0H04102A

0J304602D

BAO04806A

0C01162B

OBO6699A

OB06698A

OBO6697B

0B06700B

0H04152B

Pa

fk

ek

bak

fe

NE

a

Bat

19

OU

Bet

eek

eh

fake

tah

fe

et

ft ek

bd

Dolby

NR

Switch

P.C.B.

Ass’y

Control

Switch

P.C.B.

Ass’y

Counter

P.C.B.

Ass’y

(2nd

Version)

Counter

P.C.B.

Ass’y

(1st

Version)

Display

P.C.B.

Indicator

P.C.B.

Ass’y

Timer

Switch

P.C.B.

Ass’y

Headphone

Jack

Headphone

Plate

Mechanism

Ass’y

Cover

Plate

Ass’y

Power

Switch

Joint

Power

Switch

Holder

Power

Switch

P.C.B.

Ass’y

(U.S.A,

&

Canada)

Power

Switch

P.C.B.

Ass’y

(UK,

Australia,

Others

&

220V

Class

2)

Power

Switch

P.C.B.

Ass’y

(Japan)

Side

Chassis

L

Main

P.C.B.

Ass’y

(2nd

Version)

Main

P.C.B.

Ass’y

(1st

Version)

Main

P.C.B.

Cushion

Function

Switch

Knob

Side

Chassis

R

Pin

Jack

P.C.B.

Ass’y

Bolt

Receptacle

Plate

Power

Transformer

(UK,

Australia

&

220V

Class

2)

Power

Transformer

(U.S.A.

&

Canada)

Power

Transformer

(Japan)

Power

Transformer

(Others)

Rear

Panel

BOER

eR

Re

Re

BER

fe

BNR

PRN

REE

|

|

4

;

8